imc: make IMDCT support stereo output
[ffmpeg.git] / avconv.c
1 /*
2  * avconv main
3  * Copyright (c) 2000-2011 The libav developers.
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 #include "config.h"
23 #include <ctype.h>
24 #include <string.h>
25 #include <math.h>
26 #include <stdlib.h>
27 #include <errno.h>
28 #include <signal.h>
29 #include <limits.h>
30 #include <unistd.h>
31 #include "libavformat/avformat.h"
32 #include "libavdevice/avdevice.h"
33 #include "libswscale/swscale.h"
34 #include "libavresample/avresample.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/audioconvert.h"
37 #include "libavutil/parseutils.h"
38 #include "libavutil/samplefmt.h"
39 #include "libavutil/colorspace.h"
40 #include "libavutil/fifo.h"
41 #include "libavutil/intreadwrite.h"
42 #include "libavutil/dict.h"
43 #include "libavutil/mathematics.h"
44 #include "libavutil/pixdesc.h"
45 #include "libavutil/avstring.h"
46 #include "libavutil/libm.h"
47 #include "libavutil/imgutils.h"
48 #include "libavformat/os_support.h"
49
50 # include "libavfilter/avfilter.h"
51 # include "libavfilter/avfiltergraph.h"
52 # include "libavfilter/buffersrc.h"
53 # include "libavfilter/buffersink.h"
54 # include "libavfilter/vsrc_buffer.h"
55
56 #if HAVE_SYS_RESOURCE_H
57 #include <sys/types.h>
58 #include <sys/time.h>
59 #include <sys/resource.h>
60 #elif HAVE_GETPROCESSTIMES
61 #include <windows.h>
62 #endif
63 #if HAVE_GETPROCESSMEMORYINFO
64 #include <windows.h>
65 #include <psapi.h>
66 #endif
67
68 #if HAVE_SYS_SELECT_H
69 #include <sys/select.h>
70 #endif
71
72 #include <time.h>
73
74 #include "cmdutils.h"
75
76 #include "libavutil/avassert.h"
77
78 #define VSYNC_AUTO       -1
79 #define VSYNC_PASSTHROUGH 0
80 #define VSYNC_CFR         1
81 #define VSYNC_VFR         2
82
83 const char program_name[] = "avconv";
84 const int program_birth_year = 2000;
85
86 /* select an input stream for an output stream */
87 typedef struct StreamMap {
88     int disabled;           /** 1 is this mapping is disabled by a negative map */
89     int file_index;
90     int stream_index;
91     int sync_file_index;
92     int sync_stream_index;
93     char *linklabel;       /** name of an output link, for mapping lavfi outputs */
94 } StreamMap;
95
96 /**
97  * select an input file for an output file
98  */
99 typedef struct MetadataMap {
100     int  file;      ///< file index
101     char type;      ///< type of metadata to copy -- (g)lobal, (s)tream, (c)hapter or (p)rogram
102     int  index;     ///< stream/chapter/program number
103 } MetadataMap;
104
105 static const OptionDef options[];
106
107 static int video_discard = 0;
108 static int same_quant = 0;
109 static int do_deinterlace = 0;
110 static int intra_dc_precision = 8;
111 static int qp_hist = 0;
112
113 static int file_overwrite = 0;
114 static int do_benchmark = 0;
115 static int do_hex_dump = 0;
116 static int do_pkt_dump = 0;
117 static int do_pass = 0;
118 static char *pass_logfilename_prefix = NULL;
119 static int video_sync_method = VSYNC_AUTO;
120 static int audio_sync_method = 0;
121 static float audio_drift_threshold = 0.1;
122 static int copy_ts = 0;
123 static int copy_tb = 1;
124 static int opt_shortest = 0;
125 static char *vstats_filename;
126 static FILE *vstats_file;
127
128 static int audio_volume = 256;
129
130 static int exit_on_error = 0;
131 static int using_stdin = 0;
132 static int64_t video_size = 0;
133 static int64_t audio_size = 0;
134 static int64_t extra_size = 0;
135 static int nb_frames_dup = 0;
136 static int nb_frames_drop = 0;
137 static int input_sync;
138
139 static float dts_delta_threshold = 10;
140
141 static int print_stats = 1;
142
143 #define DEFAULT_PASS_LOGFILENAME_PREFIX "av2pass"
144
145 typedef struct InputFilter {
146     AVFilterContext    *filter;
147     struct InputStream *ist;
148     struct FilterGraph *graph;
149     uint8_t            *name;
150 } InputFilter;
151
152 typedef struct OutputFilter {
153     AVFilterContext     *filter;
154     struct OutputStream *ost;
155     struct FilterGraph  *graph;
156     uint8_t             *name;
157
158     /* temporary storage until stream maps are processed */
159     AVFilterInOut       *out_tmp;
160 } OutputFilter;
161
162 typedef struct FilterGraph {
163     int            index;
164     const char    *graph_desc;
165
166     AVFilterGraph *graph;
167
168     InputFilter   **inputs;
169     int          nb_inputs;
170     OutputFilter **outputs;
171     int         nb_outputs;
172 } FilterGraph;
173
174 typedef struct InputStream {
175     int file_index;
176     AVStream *st;
177     int discard;             /* true if stream data should be discarded */
178     int decoding_needed;     /* true if the packets must be decoded in 'raw_fifo' */
179     AVCodec *dec;
180     AVFrame *decoded_frame;
181
182     int64_t       start;     /* time when read started */
183     /* predicted dts of the next packet read for this stream or (when there are
184      * several frames in a packet) of the next frame in current packet */
185     int64_t       next_dts;
186     /* dts of the last packet read for this stream */
187     int64_t       last_dts;
188     PtsCorrectionContext pts_ctx;
189     double ts_scale;
190     int is_start;            /* is 1 at the start and after a discontinuity */
191     int showed_multi_packet_warning;
192     AVDictionary *opts;
193     AVRational framerate;               /* framerate forced with -r */
194
195     int resample_height;
196     int resample_width;
197     int resample_pix_fmt;
198
199     int      resample_sample_fmt;
200     int      resample_sample_rate;
201     int      resample_channels;
202     uint64_t resample_channel_layout;
203
204     /* a pool of free buffers for decoded data */
205     FrameBuffer *buffer_pool;
206
207     /* decoded data from this stream goes into all those filters
208      * currently video and audio only */
209     InputFilter **filters;
210     int        nb_filters;
211 } InputStream;
212
213 typedef struct InputFile {
214     AVFormatContext *ctx;
215     int eof_reached;      /* true if eof reached */
216     int ist_index;        /* index of first stream in ist_table */
217     int buffer_size;      /* current total buffer size */
218     int64_t ts_offset;
219     int nb_streams;       /* number of stream that avconv is aware of; may be different
220                              from ctx.nb_streams if new streams appear during av_read_frame() */
221     int rate_emu;
222 } InputFile;
223
224 typedef struct OutputStream {
225     int file_index;          /* file index */
226     int index;               /* stream index in the output file */
227     int source_index;        /* InputStream index */
228     AVStream *st;            /* stream in the output file */
229     int encoding_needed;     /* true if encoding needed for this stream */
230     int frame_number;
231     /* input pts and corresponding output pts
232        for A/V sync */
233     // double sync_ipts;        /* dts from the AVPacket of the demuxer in second units */
234     struct InputStream *sync_ist; /* input stream to sync against */
235     int64_t sync_opts;       /* output frame counter, could be changed to some true timestamp */ // FIXME look at frame_number
236     /* pts of the first frame encoded for this stream, used for limiting
237      * recording time */
238     int64_t first_pts;
239     AVBitStreamFilterContext *bitstream_filters;
240     AVCodec *enc;
241     int64_t max_frames;
242     AVFrame *filtered_frame;
243
244     /* video only */
245     AVRational frame_rate;
246     int force_fps;
247     int top_field_first;
248
249     float frame_aspect_ratio;
250     float last_quality;
251
252     /* forced key frames */
253     int64_t *forced_kf_pts;
254     int forced_kf_count;
255     int forced_kf_index;
256
257     FILE *logfile;
258
259     OutputFilter *filter;
260     char *avfilter;
261
262     int64_t sws_flags;
263     AVDictionary *opts;
264     int is_past_recording_time;
265     int stream_copy;
266     const char *attachment_filename;
267     int copy_initial_nonkeyframes;
268
269     enum PixelFormat pix_fmts[2];
270 } OutputStream;
271
272
273 typedef struct OutputFile {
274     AVFormatContext *ctx;
275     AVDictionary *opts;
276     int ost_index;       /* index of the first stream in output_streams */
277     int64_t recording_time; /* desired length of the resulting file in microseconds */
278     int64_t start_time;     /* start time in microseconds */
279     uint64_t limit_filesize;
280 } OutputFile;
281
282 static InputStream **input_streams = NULL;
283 static int        nb_input_streams = 0;
284 static InputFile   **input_files   = NULL;
285 static int        nb_input_files   = 0;
286
287 static OutputStream **output_streams = NULL;
288 static int         nb_output_streams = 0;
289 static OutputFile   **output_files   = NULL;
290 static int         nb_output_files   = 0;
291
292 static FilterGraph **filtergraphs;
293 int               nb_filtergraphs;
294
295 typedef struct OptionsContext {
296     /* input/output options */
297     int64_t start_time;
298     const char *format;
299
300     SpecifierOpt *codec_names;
301     int        nb_codec_names;
302     SpecifierOpt *audio_channels;
303     int        nb_audio_channels;
304     SpecifierOpt *audio_sample_rate;
305     int        nb_audio_sample_rate;
306     SpecifierOpt *frame_rates;
307     int        nb_frame_rates;
308     SpecifierOpt *frame_sizes;
309     int        nb_frame_sizes;
310     SpecifierOpt *frame_pix_fmts;
311     int        nb_frame_pix_fmts;
312
313     /* input options */
314     int64_t input_ts_offset;
315     int rate_emu;
316
317     SpecifierOpt *ts_scale;
318     int        nb_ts_scale;
319     SpecifierOpt *dump_attachment;
320     int        nb_dump_attachment;
321
322     /* output options */
323     StreamMap *stream_maps;
324     int     nb_stream_maps;
325     /* first item specifies output metadata, second is input */
326     MetadataMap (*meta_data_maps)[2];
327     int nb_meta_data_maps;
328     int metadata_global_manual;
329     int metadata_streams_manual;
330     int metadata_chapters_manual;
331     const char **attachments;
332     int       nb_attachments;
333
334     int chapters_input_file;
335
336     int64_t recording_time;
337     uint64_t limit_filesize;
338     float mux_preload;
339     float mux_max_delay;
340
341     int video_disable;
342     int audio_disable;
343     int subtitle_disable;
344     int data_disable;
345
346     /* indexed by output file stream index */
347     int   *streamid_map;
348     int nb_streamid_map;
349
350     SpecifierOpt *metadata;
351     int        nb_metadata;
352     SpecifierOpt *max_frames;
353     int        nb_max_frames;
354     SpecifierOpt *bitstream_filters;
355     int        nb_bitstream_filters;
356     SpecifierOpt *codec_tags;
357     int        nb_codec_tags;
358     SpecifierOpt *sample_fmts;
359     int        nb_sample_fmts;
360     SpecifierOpt *qscale;
361     int        nb_qscale;
362     SpecifierOpt *forced_key_frames;
363     int        nb_forced_key_frames;
364     SpecifierOpt *force_fps;
365     int        nb_force_fps;
366     SpecifierOpt *frame_aspect_ratios;
367     int        nb_frame_aspect_ratios;
368     SpecifierOpt *rc_overrides;
369     int        nb_rc_overrides;
370     SpecifierOpt *intra_matrices;
371     int        nb_intra_matrices;
372     SpecifierOpt *inter_matrices;
373     int        nb_inter_matrices;
374     SpecifierOpt *top_field_first;
375     int        nb_top_field_first;
376     SpecifierOpt *metadata_map;
377     int        nb_metadata_map;
378     SpecifierOpt *presets;
379     int        nb_presets;
380     SpecifierOpt *copy_initial_nonkeyframes;
381     int        nb_copy_initial_nonkeyframes;
382     SpecifierOpt *filters;
383     int        nb_filters;
384 } OptionsContext;
385
386 #define MATCH_PER_STREAM_OPT(name, type, outvar, fmtctx, st)\
387 {\
388     int i, ret;\
389     for (i = 0; i < o->nb_ ## name; i++) {\
390         char *spec = o->name[i].specifier;\
391         if ((ret = check_stream_specifier(fmtctx, st, spec)) > 0)\
392             outvar = o->name[i].u.type;\
393         else if (ret < 0)\
394             exit_program(1);\
395     }\
396 }
397
398 static void reset_options(OptionsContext *o)
399 {
400     const OptionDef *po = options;
401     int i;
402
403     /* all OPT_SPEC and OPT_STRING can be freed in generic way */
404     while (po->name) {
405         void *dst = (uint8_t*)o + po->u.off;
406
407         if (po->flags & OPT_SPEC) {
408             SpecifierOpt **so = dst;
409             int i, *count = (int*)(so + 1);
410             for (i = 0; i < *count; i++) {
411                 av_freep(&(*so)[i].specifier);
412                 if (po->flags & OPT_STRING)
413                     av_freep(&(*so)[i].u.str);
414             }
415             av_freep(so);
416             *count = 0;
417         } else if (po->flags & OPT_OFFSET && po->flags & OPT_STRING)
418             av_freep(dst);
419         po++;
420     }
421
422     for (i = 0; i < o->nb_stream_maps; i++)
423         av_freep(&o->stream_maps[i].linklabel);
424     av_freep(&o->stream_maps);
425     av_freep(&o->meta_data_maps);
426     av_freep(&o->streamid_map);
427
428     memset(o, 0, sizeof(*o));
429
430     o->mux_max_delay  = 0.7;
431     o->recording_time = INT64_MAX;
432     o->limit_filesize = UINT64_MAX;
433     o->chapters_input_file = INT_MAX;
434
435     uninit_opts();
436     init_opts();
437 }
438
439 /**
440  * Define a function for building a string containing a list of
441  * allowed formats,
442  */
443 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator) \
444 static char *choose_ ## var ## s(OutputStream *ost)                             \
445 {                                                                               \
446     if (ost->st->codec->var != none) {                                          \
447         get_name(ost->st->codec->var);                                          \
448         return av_strdup(name);                                                 \
449     } else if (ost->enc->supported_list) {                                      \
450         const type *p;                                                          \
451         AVIOContext *s = NULL;                                                  \
452         uint8_t *ret;                                                           \
453         int len;                                                                \
454                                                                                 \
455         if (avio_open_dyn_buf(&s) < 0)                                          \
456             exit_program(1);                                                    \
457                                                                                 \
458         for (p = ost->enc->supported_list; *p != none; p++) {                   \
459             get_name(*p);                                                       \
460             avio_printf(s, "%s" separator, name);                               \
461         }                                                                       \
462         len = avio_close_dyn_buf(s, &ret);                                      \
463         ret[len - 1] = 0;                                                       \
464         return ret;                                                             \
465     } else                                                                      \
466         return NULL;                                                            \
467 }
468
469 #define GET_PIX_FMT_NAME(pix_fmt)\
470     const char *name = av_get_pix_fmt_name(pix_fmt);
471
472 DEF_CHOOSE_FORMAT(enum PixelFormat, pix_fmt, pix_fmts, PIX_FMT_NONE,
473                   GET_PIX_FMT_NAME, ":")
474
475 #define GET_SAMPLE_FMT_NAME(sample_fmt)\
476     const char *name = av_get_sample_fmt_name(sample_fmt)
477
478 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
479                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
480
481 #define GET_SAMPLE_RATE_NAME(rate)\
482     char name[16];\
483     snprintf(name, sizeof(name), "%d", rate);
484
485 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
486                   GET_SAMPLE_RATE_NAME, ",")
487
488 #define GET_CH_LAYOUT_NAME(ch_layout)\
489     char name[16];\
490     snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
491
492 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
493                   GET_CH_LAYOUT_NAME, ",")
494
495 static FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
496 {
497     FilterGraph *fg = av_mallocz(sizeof(*fg));
498
499     if (!fg)
500         exit_program(1);
501     fg->index = nb_filtergraphs;
502
503     fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
504                              fg->nb_outputs + 1);
505     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
506         exit_program(1);
507     fg->outputs[0]->ost   = ost;
508     fg->outputs[0]->graph = fg;
509
510     ost->filter = fg->outputs[0];
511
512     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
513                             fg->nb_inputs + 1);
514     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
515         exit_program(1);
516     fg->inputs[0]->ist   = ist;
517     fg->inputs[0]->graph = fg;
518
519     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
520                               &ist->nb_filters, ist->nb_filters + 1);
521     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
522
523     filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
524                               &nb_filtergraphs, nb_filtergraphs + 1);
525     filtergraphs[nb_filtergraphs - 1] = fg;
526
527     return fg;
528 }
529
530 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
531 {
532     InputStream *ist;
533     enum AVMediaType type = in->filter_ctx->input_pads[in->pad_idx].type;
534     int i;
535
536     // TODO: support other filter types
537     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
538         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
539                "currently.\n");
540         exit_program(1);
541     }
542
543     if (in->name) {
544         AVFormatContext *s;
545         AVStream       *st = NULL;
546         char *p;
547         int file_idx = strtol(in->name, &p, 0);
548
549         if (file_idx < 0 || file_idx >= nb_input_files) {
550             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
551                    file_idx, fg->graph_desc);
552             exit_program(1);
553         }
554         s = input_files[file_idx]->ctx;
555
556         for (i = 0; i < s->nb_streams; i++) {
557             if (s->streams[i]->codec->codec_type != type)
558                 continue;
559             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
560                 st = s->streams[i];
561                 break;
562             }
563         }
564         if (!st) {
565             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
566                    "matches no streams.\n", p, fg->graph_desc);
567             exit_program(1);
568         }
569         ist = input_streams[input_files[file_idx]->ist_index + st->index];
570     } else {
571         /* find the first unused stream of corresponding type */
572         for (i = 0; i < nb_input_streams; i++) {
573             ist = input_streams[i];
574             if (ist->st->codec->codec_type == type && ist->discard)
575                 break;
576         }
577         if (i == nb_input_streams) {
578             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
579                    "unlabeled input pad %d on filter %s", in->pad_idx,
580                    in->filter_ctx->name);
581             exit_program(1);
582         }
583     }
584     ist->discard         = 0;
585     ist->decoding_needed = 1;
586     ist->st->discard = AVDISCARD_NONE;
587
588     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
589                             &fg->nb_inputs, fg->nb_inputs + 1);
590     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
591         exit_program(1);
592     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
593     fg->inputs[fg->nb_inputs - 1]->graph = fg;
594
595     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
596                               &ist->nb_filters, ist->nb_filters + 1);
597     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
598 }
599
600 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
601 {
602     char *pix_fmts;
603     OutputStream *ost = ofilter->ost;
604     AVCodecContext *codec = ost->st->codec;
605     AVFilterContext *last_filter = out->filter_ctx;
606     int pad_idx = out->pad_idx;
607     int ret;
608
609
610     ret = avfilter_graph_create_filter(&ofilter->filter,
611                                        avfilter_get_by_name("buffersink"),
612                                        "out", NULL, pix_fmts, fg->graph);
613     if (ret < 0)
614         return ret;
615
616     if (codec->width || codec->height) {
617         char args[255];
618         AVFilterContext *filter;
619
620         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
621                  codec->width,
622                  codec->height,
623                  (unsigned)ost->sws_flags);
624         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
625                                                 NULL, args, NULL, fg->graph)) < 0)
626             return ret;
627         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
628             return ret;
629
630         last_filter = filter;
631         pad_idx = 0;
632     }
633
634     if ((pix_fmts = choose_pix_fmts(ost))) {
635         AVFilterContext *filter;
636         if ((ret = avfilter_graph_create_filter(&filter,
637                                                 avfilter_get_by_name("format"),
638                                                 "format", pix_fmts, NULL,
639                                                 fg->graph)) < 0)
640             return ret;
641         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
642             return ret;
643
644         last_filter = filter;
645         pad_idx     = 0;
646         av_freep(&pix_fmts);
647     }
648
649     if (ost->frame_rate.num) {
650         AVFilterContext *fps;
651         char args[255];
652
653         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
654                  ost->frame_rate.den);
655         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
656                                            "fps", args, NULL, fg->graph);
657         if (ret < 0)
658             return ret;
659
660         ret = avfilter_link(last_filter, pad_idx, fps, 0);
661         if (ret < 0)
662             return ret;
663         last_filter = fps;
664         pad_idx = 0;
665     }
666
667     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
668         return ret;
669
670     return 0;
671 }
672
673 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
674 {
675     OutputStream *ost = ofilter->ost;
676     AVCodecContext *codec  = ost->st->codec;
677     AVFilterContext *last_filter = out->filter_ctx;
678     int pad_idx = out->pad_idx;
679     char *sample_fmts, *sample_rates, *channel_layouts;
680     int ret;
681
682     ret = avfilter_graph_create_filter(&ofilter->filter,
683                                        avfilter_get_by_name("abuffersink"),
684                                        "out", NULL, NULL, fg->graph);
685     if (ret < 0)
686         return ret;
687
688     if (codec->channels && !codec->channel_layout)
689         codec->channel_layout = av_get_default_channel_layout(codec->channels);
690
691     sample_fmts     = choose_sample_fmts(ost);
692     sample_rates    = choose_sample_rates(ost);
693     channel_layouts = choose_channel_layouts(ost);
694     if (sample_fmts || sample_rates || channel_layouts) {
695         AVFilterContext *format;
696         char args[256];
697         int len = 0;
698
699         if (sample_fmts)
700             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
701                             sample_fmts);
702         if (sample_rates)
703             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
704                             sample_rates);
705         if (channel_layouts)
706             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
707                             channel_layouts);
708         args[len - 1] = 0;
709
710         av_freep(&sample_fmts);
711         av_freep(&sample_rates);
712         av_freep(&channel_layouts);
713
714         ret = avfilter_graph_create_filter(&format,
715                                            avfilter_get_by_name("aformat"),
716                                            "aformat", args, NULL, fg->graph);
717         if (ret < 0)
718             return ret;
719
720         ret = avfilter_link(last_filter, pad_idx, format, 0);
721         if (ret < 0)
722             return ret;
723
724         last_filter = format;
725         pad_idx = 0;
726     }
727
728     if (audio_sync_method > 0) {
729         AVFilterContext *async;
730         char args[256];
731         int  len = 0;
732
733         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
734                "asyncts audio filter instead.\n");
735
736         if (audio_sync_method > 1)
737             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
738                             "max_comp=%d:", audio_sync_method);
739         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
740                  audio_drift_threshold);
741
742         ret = avfilter_graph_create_filter(&async,
743                                            avfilter_get_by_name("asyncts"),
744                                            "async", args, NULL, fg->graph);
745         if (ret < 0)
746             return ret;
747
748         ret = avfilter_link(last_filter, pad_idx, async, 0);
749         if (ret < 0)
750             return ret;
751
752         last_filter = async;
753         pad_idx = 0;
754     }
755
756     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
757         return ret;
758
759     return 0;
760 }
761
762 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
763 {                                                                  \
764     AVFilterContext *ctx = inout->filter_ctx;                      \
765     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
766     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
767     AVIOContext *pb;                                               \
768                                                                    \
769     if (avio_open_dyn_buf(&pb) < 0)                                \
770         exit_program(1);                                           \
771                                                                    \
772     avio_printf(pb, "%s", ctx->filter->name);                      \
773     if (nb_pads > 1)                                               \
774         avio_printf(pb, ":%s", pads[inout->pad_idx].name);         \
775     avio_w8(pb, 0);                                                \
776     avio_close_dyn_buf(pb, &f->name);                              \
777 }
778
779 static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
780 {
781     av_freep(&ofilter->name);
782     DESCRIBE_FILTER_LINK(ofilter, out, 0);
783
784     switch (out->filter_ctx->output_pads[out->pad_idx].type) {
785     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
786     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
787     default: av_assert0(0);
788     }
789 }
790
791 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
792                                         AVFilterInOut *in)
793 {
794     AVFilterContext *first_filter = in->filter_ctx;
795     AVFilter *filter = avfilter_get_by_name("buffer");
796     InputStream *ist = ifilter->ist;
797     AVRational tb = ist->framerate.num ? (AVRational){ist->framerate.den,
798                                                       ist->framerate.num} :
799                                          ist->st->time_base;
800     AVRational sar;
801     char args[255];
802     int pad_idx = in->pad_idx;
803     int ret;
804
805     sar = ist->st->sample_aspect_ratio.num ?
806           ist->st->sample_aspect_ratio :
807           ist->st->codec->sample_aspect_ratio;
808     snprintf(args, sizeof(args), "%d:%d:%d:%d:%d:%d:%d", ist->st->codec->width,
809              ist->st->codec->height, ist->st->codec->pix_fmt,
810              tb.num, tb.den, sar.num, sar.den);
811
812     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, in->name,
813                                             args, NULL, fg->graph)) < 0)
814         return ret;
815
816     if (ist->framerate.num) {
817         AVFilterContext *setpts;
818
819         if ((ret = avfilter_graph_create_filter(&setpts,
820                                                 avfilter_get_by_name("setpts"),
821                                                 "setpts", "N", NULL,
822                                                 fg->graph)) < 0)
823             return ret;
824
825         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
826             return ret;
827
828         first_filter = setpts;
829         pad_idx = 0;
830     }
831
832     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
833         return ret;
834     return 0;
835 }
836
837 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
838                                         AVFilterInOut *in)
839 {
840     AVFilterContext *first_filter = in->filter_ctx;
841     AVFilter *filter = avfilter_get_by_name("abuffer");
842     InputStream *ist = ifilter->ist;
843     int pad_idx = in->pad_idx;
844     char args[255];
845     int ret;
846
847     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
848              ":channel_layout=0x%"PRIx64,
849              ist->st->time_base.num, ist->st->time_base.den,
850              ist->st->codec->sample_rate,
851              av_get_sample_fmt_name(ist->st->codec->sample_fmt),
852              ist->st->codec->channel_layout);
853
854     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
855                                             in->name, args, NULL,
856                                             fg->graph)) < 0)
857         return ret;
858
859     if (audio_sync_method > 0) {
860         AVFilterContext *async;
861         char args[256];
862         int  len = 0;
863
864         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
865                "asyncts audio filter instead.\n");
866
867         if (audio_sync_method > 1)
868             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
869                             "max_comp=%d:", audio_sync_method);
870         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
871                  audio_drift_threshold);
872
873         ret = avfilter_graph_create_filter(&async,
874                                            avfilter_get_by_name("asyncts"),
875                                            "async", args, NULL, fg->graph);
876         if (ret < 0)
877             return ret;
878
879         ret = avfilter_link(async, 0, first_filter, pad_idx);
880         if (ret < 0)
881             return ret;
882
883         first_filter = async;
884         pad_idx = 0;
885     }
886     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
887         return ret;
888
889     return 0;
890 }
891
892 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
893                                   AVFilterInOut *in)
894 {
895     av_freep(&ifilter->name);
896     DESCRIBE_FILTER_LINK(ifilter, in, 1);
897
898     switch (in->filter_ctx->input_pads[in->pad_idx].type) {
899     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
900     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
901     default: av_assert0(0);
902     }
903 }
904
905 static int configure_filtergraph(FilterGraph *fg)
906 {
907     AVFilterInOut *inputs, *outputs, *cur;
908     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
909     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
910                                       fg->graph_desc;
911
912     avfilter_graph_free(&fg->graph);
913     if (!(fg->graph = avfilter_graph_alloc()))
914         return AVERROR(ENOMEM);
915
916     if (simple) {
917         OutputStream *ost = fg->outputs[0]->ost;
918         char args[255];
919         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
920         fg->graph->scale_sws_opts = av_strdup(args);
921     }
922
923     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
924         return ret;
925
926     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
927         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
928                "exactly one input and output.\n", graph_desc);
929         return AVERROR(EINVAL);
930     }
931
932     for (cur = inputs; !simple && init && cur; cur = cur->next)
933         init_input_filter(fg, cur);
934
935     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
936         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
937             return ret;
938     avfilter_inout_free(&inputs);
939
940     if (!init || simple) {
941         /* we already know the mappings between lavfi outputs and output streams,
942          * so we can finish the setup */
943         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
944             configure_output_filter(fg, fg->outputs[i], cur);
945         avfilter_inout_free(&outputs);
946
947         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
948             return ret;
949     } else {
950         /* wait until output mappings are processed */
951         for (cur = outputs; cur;) {
952             fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
953                                      &fg->nb_outputs, fg->nb_outputs + 1);
954             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
955                 exit_program(1);
956             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
957             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
958             cur = cur->next;
959             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
960         }
961     }
962
963     return 0;
964 }
965
966 static int configure_complex_filters(void)
967 {
968     int i, ret = 0;
969
970     for (i = 0; i < nb_filtergraphs; i++)
971         if (!filtergraphs[i]->graph &&
972             (ret = configure_filtergraph(filtergraphs[i])) < 0)
973             return ret;
974     return 0;
975 }
976
977 static int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
978 {
979     int i;
980     for (i = 0; i < fg->nb_inputs; i++)
981         if (fg->inputs[i]->ist == ist)
982             return 1;
983     return 0;
984 }
985
986 static void term_exit(void)
987 {
988     av_log(NULL, AV_LOG_QUIET, "");
989 }
990
991 static volatile int received_sigterm = 0;
992 static volatile int received_nb_signals = 0;
993
994 static void
995 sigterm_handler(int sig)
996 {
997     received_sigterm = sig;
998     received_nb_signals++;
999     term_exit();
1000 }
1001
1002 static void term_init(void)
1003 {
1004     signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
1005     signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
1006 #ifdef SIGXCPU
1007     signal(SIGXCPU, sigterm_handler);
1008 #endif
1009 }
1010
1011 static int decode_interrupt_cb(void *ctx)
1012 {
1013     return received_nb_signals > 1;
1014 }
1015
1016 static const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };
1017
1018 void exit_program(int ret)
1019 {
1020     int i, j;
1021
1022     for (i = 0; i < nb_filtergraphs; i++) {
1023         avfilter_graph_free(&filtergraphs[i]->graph);
1024         for (j = 0; j < filtergraphs[i]->nb_inputs; j++) {
1025             av_freep(&filtergraphs[i]->inputs[j]->name);
1026             av_freep(&filtergraphs[i]->inputs[j]);
1027         }
1028         av_freep(&filtergraphs[i]->inputs);
1029         for (j = 0; j < filtergraphs[i]->nb_outputs; j++) {
1030             av_freep(&filtergraphs[i]->outputs[j]->name);
1031             av_freep(&filtergraphs[i]->outputs[j]);
1032         }
1033         av_freep(&filtergraphs[i]->outputs);
1034         av_freep(&filtergraphs[i]);
1035     }
1036     av_freep(&filtergraphs);
1037
1038     /* close files */
1039     for (i = 0; i < nb_output_files; i++) {
1040         AVFormatContext *s = output_files[i]->ctx;
1041         if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
1042             avio_close(s->pb);
1043         avformat_free_context(s);
1044         av_dict_free(&output_files[i]->opts);
1045         av_freep(&output_files[i]);
1046     }
1047     for (i = 0; i < nb_output_streams; i++) {
1048         AVBitStreamFilterContext *bsfc = output_streams[i]->bitstream_filters;
1049         while (bsfc) {
1050             AVBitStreamFilterContext *next = bsfc->next;
1051             av_bitstream_filter_close(bsfc);
1052             bsfc = next;
1053         }
1054         output_streams[i]->bitstream_filters = NULL;
1055
1056         av_freep(&output_streams[i]->avfilter);
1057         av_freep(&output_streams[i]->filtered_frame);
1058         av_freep(&output_streams[i]);
1059     }
1060     for (i = 0; i < nb_input_files; i++) {
1061         avformat_close_input(&input_files[i]->ctx);
1062         av_freep(&input_files[i]);
1063     }
1064     for (i = 0; i < nb_input_streams; i++) {
1065         av_freep(&input_streams[i]->decoded_frame);
1066         av_dict_free(&input_streams[i]->opts);
1067         free_buffer_pool(&input_streams[i]->buffer_pool);
1068         av_freep(&input_streams[i]->filters);
1069         av_freep(&input_streams[i]);
1070     }
1071
1072     if (vstats_file)
1073         fclose(vstats_file);
1074     av_free(vstats_filename);
1075
1076     av_freep(&input_streams);
1077     av_freep(&input_files);
1078     av_freep(&output_streams);
1079     av_freep(&output_files);
1080
1081     uninit_opts();
1082
1083     avfilter_uninit();
1084     avformat_network_deinit();
1085
1086     if (received_sigterm) {
1087         av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\n",
1088                (int) received_sigterm);
1089         exit (255);
1090     }
1091
1092     exit(ret);
1093 }
1094
1095 static void assert_avoptions(AVDictionary *m)
1096 {
1097     AVDictionaryEntry *t;
1098     if ((t = av_dict_get(m, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
1099         av_log(NULL, AV_LOG_FATAL, "Option %s not found.\n", t->key);
1100         exit_program(1);
1101     }
1102 }
1103
1104 static void assert_codec_experimental(AVCodecContext *c, int encoder)
1105 {
1106     const char *codec_string = encoder ? "encoder" : "decoder";
1107     AVCodec *codec;
1108     if (c->codec->capabilities & CODEC_CAP_EXPERIMENTAL &&
1109         c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
1110         av_log(NULL, AV_LOG_FATAL, "%s '%s' is experimental and might produce bad "
1111                 "results.\nAdd '-strict experimental' if you want to use it.\n",
1112                 codec_string, c->codec->name);
1113         codec = encoder ? avcodec_find_encoder(c->codec->id) : avcodec_find_decoder(c->codec->id);
1114         if (!(codec->capabilities & CODEC_CAP_EXPERIMENTAL))
1115             av_log(NULL, AV_LOG_FATAL, "Or use the non experimental %s '%s'.\n",
1116                    codec_string, codec->name);
1117         exit_program(1);
1118     }
1119 }
1120
1121 /**
1122  * Update the requested input sample format based on the output sample format.
1123  * This is currently only used to request float output from decoders which
1124  * support multiple sample formats, one of which is AV_SAMPLE_FMT_FLT.
1125  * Ideally this will be removed in the future when decoders do not do format
1126  * conversion and only output in their native format.
1127  */
1128 static void update_sample_fmt(AVCodecContext *dec, AVCodec *dec_codec,
1129                               AVCodecContext *enc)
1130 {
1131     /* if sample formats match or a decoder sample format has already been
1132        requested, just return */
1133     if (enc->sample_fmt == dec->sample_fmt ||
1134         dec->request_sample_fmt > AV_SAMPLE_FMT_NONE)
1135         return;
1136
1137     /* if decoder supports more than one output format */
1138     if (dec_codec && dec_codec->sample_fmts &&
1139         dec_codec->sample_fmts[0] != AV_SAMPLE_FMT_NONE &&
1140         dec_codec->sample_fmts[1] != AV_SAMPLE_FMT_NONE) {
1141         const enum AVSampleFormat *p;
1142         int min_dec = -1, min_inc = -1;
1143
1144         /* find a matching sample format in the encoder */
1145         for (p = dec_codec->sample_fmts; *p != AV_SAMPLE_FMT_NONE; p++) {
1146             if (*p == enc->sample_fmt) {
1147                 dec->request_sample_fmt = *p;
1148                 return;
1149             } else if (*p > enc->sample_fmt) {
1150                 min_inc = FFMIN(min_inc, *p - enc->sample_fmt);
1151             } else
1152                 min_dec = FFMIN(min_dec, enc->sample_fmt - *p);
1153         }
1154
1155         /* if none match, provide the one that matches quality closest */
1156         dec->request_sample_fmt = min_inc > 0 ? enc->sample_fmt + min_inc :
1157                                   enc->sample_fmt - min_dec;
1158     }
1159 }
1160
1161 static void write_frame(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
1162 {
1163     AVBitStreamFilterContext *bsfc = ost->bitstream_filters;
1164     AVCodecContext          *avctx = ost->st->codec;
1165     int ret;
1166
1167     /*
1168      * Audio encoders may split the packets --  #frames in != #packets out.
1169      * But there is no reordering, so we can limit the number of output packets
1170      * by simply dropping them here.
1171      * Counting encoded video frames needs to be done separately because of
1172      * reordering, see do_video_out()
1173      */
1174     if (!(avctx->codec_type == AVMEDIA_TYPE_VIDEO && avctx->codec)) {
1175         if (ost->frame_number >= ost->max_frames) {
1176             av_free_packet(pkt);
1177             return;
1178         }
1179         ost->frame_number++;
1180     }
1181
1182     while (bsfc) {
1183         AVPacket new_pkt = *pkt;
1184         int a = av_bitstream_filter_filter(bsfc, avctx, NULL,
1185                                            &new_pkt.data, &new_pkt.size,
1186                                            pkt->data, pkt->size,
1187                                            pkt->flags & AV_PKT_FLAG_KEY);
1188         if (a > 0) {
1189             av_free_packet(pkt);
1190             new_pkt.destruct = av_destruct_packet;
1191         } else if (a < 0) {
1192             av_log(NULL, AV_LOG_ERROR, "%s failed for stream %d, codec %s",
1193                    bsfc->filter->name, pkt->stream_index,
1194                    avctx->codec ? avctx->codec->name : "copy");
1195             print_error("", a);
1196             if (exit_on_error)
1197                 exit_program(1);
1198         }
1199         *pkt = new_pkt;
1200
1201         bsfc = bsfc->next;
1202     }
1203
1204     pkt->stream_index = ost->index;
1205     ret = av_interleaved_write_frame(s, pkt);
1206     if (ret < 0) {
1207         print_error("av_interleaved_write_frame()", ret);
1208         exit_program(1);
1209     }
1210 }
1211
1212 static int check_recording_time(OutputStream *ost)
1213 {
1214     OutputFile *of = output_files[ost->file_index];
1215
1216     if (of->recording_time != INT64_MAX &&
1217         av_compare_ts(ost->sync_opts - ost->first_pts, ost->st->codec->time_base, of->recording_time,
1218                       AV_TIME_BASE_Q) >= 0) {
1219         ost->is_past_recording_time = 1;
1220         return 0;
1221     }
1222     return 1;
1223 }
1224
1225 static void do_audio_out(AVFormatContext *s, OutputStream *ost,
1226                          AVFrame *frame)
1227 {
1228     AVCodecContext *enc = ost->st->codec;
1229     AVPacket pkt;
1230     int got_packet = 0;
1231
1232     av_init_packet(&pkt);
1233     pkt.data = NULL;
1234     pkt.size = 0;
1235
1236     if (!check_recording_time(ost))
1237         return;
1238
1239     if (frame->pts == AV_NOPTS_VALUE || audio_sync_method < 0)
1240         frame->pts = ost->sync_opts;
1241     ost->sync_opts = frame->pts + frame->nb_samples;
1242
1243     if (avcodec_encode_audio2(enc, &pkt, frame, &got_packet) < 0) {
1244         av_log(NULL, AV_LOG_FATAL, "Audio encoding failed\n");
1245         exit_program(1);
1246     }
1247
1248     if (got_packet) {
1249         if (pkt.pts != AV_NOPTS_VALUE)
1250             pkt.pts      = av_rescale_q(pkt.pts,      enc->time_base, ost->st->time_base);
1251         if (pkt.dts != AV_NOPTS_VALUE)
1252             pkt.dts      = av_rescale_q(pkt.dts,      enc->time_base, ost->st->time_base);
1253         if (pkt.duration > 0)
1254             pkt.duration = av_rescale_q(pkt.duration, enc->time_base, ost->st->time_base);
1255
1256         write_frame(s, &pkt, ost);
1257
1258         audio_size += pkt.size;
1259     }
1260 }
1261
1262 static void pre_process_video_frame(InputStream *ist, AVPicture *picture, void **bufp)
1263 {
1264     AVCodecContext *dec;
1265     AVPicture *picture2;
1266     AVPicture picture_tmp;
1267     uint8_t *buf = 0;
1268
1269     dec = ist->st->codec;
1270
1271     /* deinterlace : must be done before any resize */
1272     if (do_deinterlace) {
1273         int size;
1274
1275         /* create temporary picture */
1276         size = avpicture_get_size(dec->pix_fmt, dec->width, dec->height);
1277         buf  = av_malloc(size);
1278         if (!buf)
1279             return;
1280
1281         picture2 = &picture_tmp;
1282         avpicture_fill(picture2, buf, dec->pix_fmt, dec->width, dec->height);
1283
1284         if (avpicture_deinterlace(picture2, picture,
1285                                  dec->pix_fmt, dec->width, dec->height) < 0) {
1286             /* if error, do not deinterlace */
1287             av_log(NULL, AV_LOG_WARNING, "Deinterlacing failed\n");
1288             av_free(buf);
1289             buf = NULL;
1290             picture2 = picture;
1291         }
1292     } else {
1293         picture2 = picture;
1294     }
1295
1296     if (picture != picture2)
1297         *picture = *picture2;
1298     *bufp = buf;
1299 }
1300
1301 static void do_subtitle_out(AVFormatContext *s,
1302                             OutputStream *ost,
1303                             InputStream *ist,
1304                             AVSubtitle *sub,
1305                             int64_t pts)
1306 {
1307     static uint8_t *subtitle_out = NULL;
1308     int subtitle_out_max_size = 1024 * 1024;
1309     int subtitle_out_size, nb, i;
1310     AVCodecContext *enc;
1311     AVPacket pkt;
1312
1313     if (pts == AV_NOPTS_VALUE) {
1314         av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
1315         if (exit_on_error)
1316             exit_program(1);
1317         return;
1318     }
1319
1320     enc = ost->st->codec;
1321
1322     if (!subtitle_out) {
1323         subtitle_out = av_malloc(subtitle_out_max_size);
1324     }
1325
1326     /* Note: DVB subtitle need one packet to draw them and one other
1327        packet to clear them */
1328     /* XXX: signal it in the codec context ? */
1329     if (enc->codec_id == CODEC_ID_DVB_SUBTITLE)
1330         nb = 2;
1331     else
1332         nb = 1;
1333
1334     for (i = 0; i < nb; i++) {
1335         ost->sync_opts = av_rescale_q(pts, ist->st->time_base, enc->time_base);
1336         if (!check_recording_time(ost))
1337             return;
1338
1339         sub->pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q);
1340         // start_display_time is required to be 0
1341         sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
1342         sub->end_display_time  -= sub->start_display_time;
1343         sub->start_display_time = 0;
1344         subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
1345                                                     subtitle_out_max_size, sub);
1346         if (subtitle_out_size < 0) {
1347             av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
1348             exit_program(1);
1349         }
1350
1351         av_init_packet(&pkt);
1352         pkt.data = subtitle_out;
1353         pkt.size = subtitle_out_size;
1354         pkt.pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->st->time_base);
1355         if (enc->codec_id == CODEC_ID_DVB_SUBTITLE) {
1356             /* XXX: the pts correction is handled here. Maybe handling
1357                it in the codec would be better */
1358             if (i == 0)
1359                 pkt.pts += 90 * sub->start_display_time;
1360             else
1361                 pkt.pts += 90 * sub->end_display_time;
1362         }
1363         write_frame(s, &pkt, ost);
1364     }
1365 }
1366
1367 static void do_video_out(AVFormatContext *s,
1368                          OutputStream *ost,
1369                          AVFrame *in_picture,
1370                          int *frame_size, float quality)
1371 {
1372     int ret, format_video_sync;
1373     AVPacket pkt;
1374     AVCodecContext *enc = ost->st->codec;
1375
1376     *frame_size = 0;
1377
1378     format_video_sync = video_sync_method;
1379     if (format_video_sync == VSYNC_AUTO)
1380         format_video_sync = (s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH :
1381                             (s->oformat->flags & AVFMT_VARIABLE_FPS) ? VSYNC_VFR : VSYNC_CFR;
1382     if (format_video_sync != VSYNC_PASSTHROUGH &&
1383         ost->frame_number &&
1384         in_picture->pts != AV_NOPTS_VALUE &&
1385         in_picture->pts < ost->sync_opts) {
1386         nb_frames_drop++;
1387         av_log(NULL, AV_LOG_VERBOSE, "*** drop!\n");
1388         return;
1389     }
1390
1391     if (in_picture->pts == AV_NOPTS_VALUE)
1392         in_picture->pts = ost->sync_opts;
1393     ost->sync_opts = in_picture->pts;
1394
1395
1396     if (!ost->frame_number)
1397         ost->first_pts = in_picture->pts;
1398
1399     av_init_packet(&pkt);
1400     pkt.data = NULL;
1401     pkt.size = 0;
1402
1403     if (!check_recording_time(ost) ||
1404         ost->frame_number >= ost->max_frames)
1405         return;
1406
1407     if (s->oformat->flags & AVFMT_RAWPICTURE &&
1408         enc->codec->id == CODEC_ID_RAWVIDEO) {
1409         /* raw pictures are written as AVPicture structure to
1410            avoid any copies. We support temporarily the older
1411            method. */
1412         enc->coded_frame->interlaced_frame = in_picture->interlaced_frame;
1413         enc->coded_frame->top_field_first  = in_picture->top_field_first;
1414         pkt.data   = (uint8_t *)in_picture;
1415         pkt.size   =  sizeof(AVPicture);
1416         pkt.pts    = av_rescale_q(in_picture->pts, enc->time_base, ost->st->time_base);
1417         pkt.flags |= AV_PKT_FLAG_KEY;
1418
1419         write_frame(s, &pkt, ost);
1420     } else {
1421         int got_packet;
1422         AVFrame big_picture;
1423
1424         big_picture = *in_picture;
1425         /* better than nothing: use input picture interlaced
1426            settings */
1427         big_picture.interlaced_frame = in_picture->interlaced_frame;
1428         if (ost->st->codec->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME)) {
1429             if (ost->top_field_first == -1)
1430                 big_picture.top_field_first = in_picture->top_field_first;
1431             else
1432                 big_picture.top_field_first = !!ost->top_field_first;
1433         }
1434
1435         /* handles same_quant here. This is not correct because it may
1436            not be a global option */
1437         big_picture.quality = quality;
1438         if (!enc->me_threshold)
1439             big_picture.pict_type = 0;
1440         if (ost->forced_kf_index < ost->forced_kf_count &&
1441             big_picture.pts >= ost->forced_kf_pts[ost->forced_kf_index]) {
1442             big_picture.pict_type = AV_PICTURE_TYPE_I;
1443             ost->forced_kf_index++;
1444         }
1445         ret = avcodec_encode_video2(enc, &pkt, &big_picture, &got_packet);
1446         if (ret < 0) {
1447             av_log(NULL, AV_LOG_FATAL, "Video encoding failed\n");
1448             exit_program(1);
1449         }
1450
1451         if (got_packet) {
1452             if (pkt.pts != AV_NOPTS_VALUE)
1453                 pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
1454             if (pkt.dts != AV_NOPTS_VALUE)
1455                 pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
1456
1457             write_frame(s, &pkt, ost);
1458             *frame_size = pkt.size;
1459             video_size += pkt.size;
1460
1461             /* if two pass, output log */
1462             if (ost->logfile && enc->stats_out) {
1463                 fprintf(ost->logfile, "%s", enc->stats_out);
1464             }
1465         }
1466     }
1467     ost->sync_opts++;
1468     /*
1469      * For video, number of frames in == number of packets out.
1470      * But there may be reordering, so we can't throw away frames on encoder
1471      * flush, we need to limit them here, before they go into encoder.
1472      */
1473     ost->frame_number++;
1474 }
1475
1476 static double psnr(double d)
1477 {
1478     return -10.0 * log(d) / log(10.0);
1479 }
1480
1481 static void do_video_stats(AVFormatContext *os, OutputStream *ost,
1482                            int frame_size)
1483 {
1484     AVCodecContext *enc;
1485     int frame_number;
1486     double ti1, bitrate, avg_bitrate;
1487
1488     /* this is executed just the first time do_video_stats is called */
1489     if (!vstats_file) {
1490         vstats_file = fopen(vstats_filename, "w");
1491         if (!vstats_file) {
1492             perror("fopen");
1493             exit_program(1);
1494         }
1495     }
1496
1497     enc = ost->st->codec;
1498     if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
1499         frame_number = ost->frame_number;
1500         fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality / (float)FF_QP2LAMBDA);
1501         if (enc->flags&CODEC_FLAG_PSNR)
1502             fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0] / (enc->width * enc->height * 255.0 * 255.0)));
1503
1504         fprintf(vstats_file,"f_size= %6d ", frame_size);
1505         /* compute pts value */
1506         ti1 = ost->sync_opts * av_q2d(enc->time_base);
1507         if (ti1 < 0.01)
1508             ti1 = 0.01;
1509
1510         bitrate     = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
1511         avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
1512         fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
1513                (double)video_size / 1024, ti1, bitrate, avg_bitrate);
1514         fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
1515     }
1516 }
1517
1518 /* check for new output on any of the filtergraphs */
1519 static int poll_filters(void)
1520 {
1521     AVFilterBufferRef *picref;
1522     AVFrame *filtered_frame = NULL;
1523     int i, frame_size;
1524
1525     for (i = 0; i < nb_output_streams; i++) {
1526         OutputStream *ost = output_streams[i];
1527         OutputFile    *of = output_files[ost->file_index];
1528         int ret = 0;
1529
1530         if (!ost->filter)
1531             continue;
1532
1533         if (!ost->filtered_frame && !(ost->filtered_frame = avcodec_alloc_frame())) {
1534             return AVERROR(ENOMEM);
1535         } else
1536             avcodec_get_frame_defaults(ost->filtered_frame);
1537         filtered_frame = ost->filtered_frame;
1538
1539         while (ret >= 0 && !ost->is_past_recording_time) {
1540             if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1541                 !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
1542                 ret = av_buffersink_read_samples(ost->filter->filter, &picref,
1543                                                  ost->st->codec->frame_size);
1544             else
1545                 ret = av_buffersink_read(ost->filter->filter, &picref);
1546
1547             if (ret < 0)
1548                 break;
1549
1550             avfilter_copy_buf_props(filtered_frame, picref);
1551             if (picref->pts != AV_NOPTS_VALUE)
1552                 filtered_frame->pts = av_rescale_q(picref->pts,
1553                                                    ost->filter->filter->inputs[0]->time_base,
1554                                                    ost->st->codec->time_base) -
1555                                       av_rescale_q(of->start_time,
1556                                                    AV_TIME_BASE_Q,
1557                                                    ost->st->codec->time_base);
1558
1559             if (of->start_time && filtered_frame->pts < of->start_time) {
1560                 avfilter_unref_buffer(picref);
1561                 continue;
1562             }
1563
1564             switch (ost->filter->filter->inputs[0]->type) {
1565             case AVMEDIA_TYPE_VIDEO:
1566                 if (!ost->frame_aspect_ratio)
1567                     ost->st->codec->sample_aspect_ratio = picref->video->pixel_aspect;
1568
1569                 do_video_out(of->ctx, ost, filtered_frame, &frame_size,
1570                              same_quant ? ost->last_quality :
1571                                           ost->st->codec->global_quality);
1572                 if (vstats_filename && frame_size)
1573                     do_video_stats(of->ctx, ost, frame_size);
1574                 break;
1575             case AVMEDIA_TYPE_AUDIO:
1576                 do_audio_out(of->ctx, ost, filtered_frame);
1577                 break;
1578             default:
1579                 // TODO support subtitle filters
1580                 av_assert0(0);
1581             }
1582
1583             avfilter_unref_buffer(picref);
1584         }
1585     }
1586     return 0;
1587 }
1588
1589 static void print_report(int is_last_report, int64_t timer_start)
1590 {
1591     char buf[1024];
1592     OutputStream *ost;
1593     AVFormatContext *oc;
1594     int64_t total_size;
1595     AVCodecContext *enc;
1596     int frame_number, vid, i;
1597     double bitrate, ti1, pts;
1598     static int64_t last_time = -1;
1599     static int qp_histogram[52];
1600
1601     if (!print_stats && !is_last_report)
1602         return;
1603
1604     if (!is_last_report) {
1605         int64_t cur_time;
1606         /* display the report every 0.5 seconds */
1607         cur_time = av_gettime();
1608         if (last_time == -1) {
1609             last_time = cur_time;
1610             return;
1611         }
1612         if ((cur_time - last_time) < 500000)
1613             return;
1614         last_time = cur_time;
1615     }
1616
1617
1618     oc = output_files[0]->ctx;
1619
1620     total_size = avio_size(oc->pb);
1621     if (total_size < 0) // FIXME improve avio_size() so it works with non seekable output too
1622         total_size = avio_tell(oc->pb);
1623
1624     buf[0] = '\0';
1625     ti1 = 1e10;
1626     vid = 0;
1627     for (i = 0; i < nb_output_streams; i++) {
1628         float q = -1;
1629         ost = output_streams[i];
1630         enc = ost->st->codec;
1631         if (!ost->stream_copy && enc->coded_frame)
1632             q = enc->coded_frame->quality / (float)FF_QP2LAMBDA;
1633         if (vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
1634             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "q=%2.1f ", q);
1635         }
1636         if (!vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
1637             float t = (av_gettime() - timer_start) / 1000000.0;
1638
1639             frame_number = ost->frame_number;
1640             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "frame=%5d fps=%3d q=%3.1f ",
1641                      frame_number, (t > 1) ? (int)(frame_number / t + 0.5) : 0, q);
1642             if (is_last_report)
1643                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "L");
1644             if (qp_hist) {
1645                 int j;
1646                 int qp = lrintf(q);
1647                 if (qp >= 0 && qp < FF_ARRAY_ELEMS(qp_histogram))
1648                     qp_histogram[qp]++;
1649                 for (j = 0; j < 32; j++)
1650                     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%X", (int)lrintf(log(qp_histogram[j] + 1) / log(2)));
1651             }
1652             if (enc->flags&CODEC_FLAG_PSNR) {
1653                 int j;
1654                 double error, error_sum = 0;
1655                 double scale, scale_sum = 0;
1656                 char type[3] = { 'Y','U','V' };
1657                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "PSNR=");
1658                 for (j = 0; j < 3; j++) {
1659                     if (is_last_report) {
1660                         error = enc->error[j];
1661                         scale = enc->width * enc->height * 255.0 * 255.0 * frame_number;
1662                     } else {
1663                         error = enc->coded_frame->error[j];
1664                         scale = enc->width * enc->height * 255.0 * 255.0;
1665                     }
1666                     if (j)
1667                         scale /= 4;
1668                     error_sum += error;
1669                     scale_sum += scale;
1670                     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%c:%2.2f ", type[j], psnr(error / scale));
1671                 }
1672                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "*:%2.2f ", psnr(error_sum / scale_sum));
1673             }
1674             vid = 1;
1675         }
1676         /* compute min output value */
1677         pts = (double)ost->st->pts.val * av_q2d(ost->st->time_base);
1678         if ((pts < ti1) && (pts > 0))
1679             ti1 = pts;
1680     }
1681     if (ti1 < 0.01)
1682         ti1 = 0.01;
1683
1684     bitrate = (double)(total_size * 8) / ti1 / 1000.0;
1685
1686     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
1687             "size=%8.0fkB time=%0.2f bitrate=%6.1fkbits/s",
1688             (double)total_size / 1024, ti1, bitrate);
1689
1690     if (nb_frames_dup || nb_frames_drop)
1691         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " dup=%d drop=%d",
1692                 nb_frames_dup, nb_frames_drop);
1693
1694     av_log(NULL, AV_LOG_INFO, "%s    \r", buf);
1695
1696     fflush(stderr);
1697
1698     if (is_last_report) {
1699         int64_t raw= audio_size + video_size + extra_size;
1700         av_log(NULL, AV_LOG_INFO, "\n");
1701         av_log(NULL, AV_LOG_INFO, "video:%1.0fkB audio:%1.0fkB global headers:%1.0fkB muxing overhead %f%%\n",
1702                video_size / 1024.0,
1703                audio_size / 1024.0,
1704                extra_size / 1024.0,
1705                100.0 * (total_size - raw) / raw
1706         );
1707     }
1708 }
1709
1710 static void flush_encoders(void)
1711 {
1712     int i, ret;
1713
1714     for (i = 0; i < nb_output_streams; i++) {
1715         OutputStream   *ost = output_streams[i];
1716         AVCodecContext *enc = ost->st->codec;
1717         AVFormatContext *os = output_files[ost->file_index]->ctx;
1718         int stop_encoding = 0;
1719
1720         if (!ost->encoding_needed)
1721             continue;
1722
1723         if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO && enc->frame_size <= 1)
1724             continue;
1725         if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (os->oformat->flags & AVFMT_RAWPICTURE) && enc->codec->id == CODEC_ID_RAWVIDEO)
1726             continue;
1727
1728         for (;;) {
1729             int (*encode)(AVCodecContext*, AVPacket*, const AVFrame*, int*) = NULL;
1730             const char *desc;
1731             int64_t *size;
1732
1733             switch (ost->st->codec->codec_type) {
1734             case AVMEDIA_TYPE_AUDIO:
1735                 encode = avcodec_encode_audio2;
1736                 desc   = "Audio";
1737                 size   = &audio_size;
1738                 break;
1739             case AVMEDIA_TYPE_VIDEO:
1740                 encode = avcodec_encode_video2;
1741                 desc   = "Video";
1742                 size   = &video_size;
1743                 break;
1744             default:
1745                 stop_encoding = 1;
1746             }
1747
1748             if (encode) {
1749                 AVPacket pkt;
1750                 int got_packet;
1751                 av_init_packet(&pkt);
1752                 pkt.data = NULL;
1753                 pkt.size = 0;
1754
1755                 ret = encode(enc, &pkt, NULL, &got_packet);
1756                 if (ret < 0) {
1757                     av_log(NULL, AV_LOG_FATAL, "%s encoding failed\n", desc);
1758                     exit_program(1);
1759                 }
1760                 *size += ret;
1761                 if (ost->logfile && enc->stats_out) {
1762                     fprintf(ost->logfile, "%s", enc->stats_out);
1763                 }
1764                 if (!got_packet) {
1765                     stop_encoding = 1;
1766                     break;
1767                 }
1768                 if (pkt.pts != AV_NOPTS_VALUE)
1769                     pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
1770                 if (pkt.dts != AV_NOPTS_VALUE)
1771                     pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
1772                 write_frame(os, &pkt, ost);
1773             }
1774
1775             if (stop_encoding)
1776                 break;
1777         }
1778     }
1779 }
1780
1781 /*
1782  * Check whether a packet from ist should be written into ost at this time
1783  */
1784 static int check_output_constraints(InputStream *ist, OutputStream *ost)
1785 {
1786     OutputFile *of = output_files[ost->file_index];
1787     int ist_index  = input_files[ist->file_index]->ist_index + ist->st->index;
1788
1789     if (ost->source_index != ist_index)
1790         return 0;
1791
1792     if (of->start_time && ist->last_dts < of->start_time)
1793         return 0;
1794
1795     return 1;
1796 }
1797
1798 static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *pkt)
1799 {
1800     OutputFile *of = output_files[ost->file_index];
1801     int64_t ost_tb_start_time = av_rescale_q(of->start_time, AV_TIME_BASE_Q, ost->st->time_base);
1802     AVPacket opkt;
1803
1804     av_init_packet(&opkt);
1805
1806     if ((!ost->frame_number && !(pkt->flags & AV_PKT_FLAG_KEY)) &&
1807         !ost->copy_initial_nonkeyframes)
1808         return;
1809
1810     if (of->recording_time != INT64_MAX &&
1811         ist->last_dts >= of->recording_time + of->start_time) {
1812         ost->is_past_recording_time = 1;
1813         return;
1814     }
1815
1816     /* force the input stream PTS */
1817     if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
1818         audio_size += pkt->size;
1819     else if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1820         video_size += pkt->size;
1821         ost->sync_opts++;
1822     }
1823
1824     if (pkt->pts != AV_NOPTS_VALUE)
1825         opkt.pts = av_rescale_q(pkt->pts, ist->st->time_base, ost->st->time_base) - ost_tb_start_time;
1826     else
1827         opkt.pts = AV_NOPTS_VALUE;
1828
1829     if (pkt->dts == AV_NOPTS_VALUE)
1830         opkt.dts = av_rescale_q(ist->last_dts, AV_TIME_BASE_Q, ost->st->time_base);
1831     else
1832         opkt.dts = av_rescale_q(pkt->dts, ist->st->time_base, ost->st->time_base);
1833     opkt.dts -= ost_tb_start_time;
1834
1835     opkt.duration = av_rescale_q(pkt->duration, ist->st->time_base, ost->st->time_base);
1836     opkt.flags    = pkt->flags;
1837
1838     // FIXME remove the following 2 lines they shall be replaced by the bitstream filters
1839     if (  ost->st->codec->codec_id != CODEC_ID_H264
1840        && ost->st->codec->codec_id != CODEC_ID_MPEG1VIDEO
1841        && ost->st->codec->codec_id != CODEC_ID_MPEG2VIDEO
1842        && ost->st->codec->codec_id != CODEC_ID_VC1
1843        ) {
1844         if (av_parser_change(ist->st->parser, ost->st->codec, &opkt.data, &opkt.size, pkt->data, pkt->size, pkt->flags & AV_PKT_FLAG_KEY))
1845             opkt.destruct = av_destruct_packet;
1846     } else {
1847         opkt.data = pkt->data;
1848         opkt.size = pkt->size;
1849     }
1850
1851     write_frame(of->ctx, &opkt, ost);
1852     ost->st->codec->frame_number++;
1853     av_free_packet(&opkt);
1854 }
1855
1856 static void rate_emu_sleep(InputStream *ist)
1857 {
1858     if (input_files[ist->file_index]->rate_emu) {
1859         int64_t pts = av_rescale(ist->last_dts, 1000000, AV_TIME_BASE);
1860         int64_t now = av_gettime() - ist->start;
1861         if (pts > now)
1862             usleep(pts - now);
1863     }
1864 }
1865
1866 static int guess_input_channel_layout(InputStream *ist)
1867 {
1868     AVCodecContext *dec = ist->st->codec;
1869
1870     if (!dec->channel_layout) {
1871         char layout_name[256];
1872
1873         dec->channel_layout = av_get_default_channel_layout(dec->channels);
1874         if (!dec->channel_layout)
1875             return 0;
1876         av_get_channel_layout_string(layout_name, sizeof(layout_name),
1877                                      dec->channels, dec->channel_layout);
1878         av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for  Input Stream "
1879                "#%d.%d : %s\n", ist->file_index, ist->st->index, layout_name);
1880     }
1881     return 1;
1882 }
1883
1884 static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output)
1885 {
1886     AVFrame *decoded_frame;
1887     AVCodecContext *avctx = ist->st->codec;
1888     int bps = av_get_bytes_per_sample(ist->st->codec->sample_fmt);
1889     int i, ret, resample_changed;
1890
1891     if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
1892         return AVERROR(ENOMEM);
1893     else
1894         avcodec_get_frame_defaults(ist->decoded_frame);
1895     decoded_frame = ist->decoded_frame;
1896
1897     ret = avcodec_decode_audio4(avctx, decoded_frame, got_output, pkt);
1898     if (ret < 0) {
1899         return ret;
1900     }
1901
1902     if (!*got_output) {
1903         /* no audio frame */
1904         if (!pkt->size)
1905             for (i = 0; i < ist->nb_filters; i++)
1906                 av_buffersrc_buffer(ist->filters[i]->filter, NULL);
1907         return ret;
1908     }
1909
1910     /* if the decoder provides a pts, use it instead of the last packet pts.
1911        the decoder could be delaying output by a packet or more. */
1912     if (decoded_frame->pts != AV_NOPTS_VALUE)
1913         ist->next_dts = decoded_frame->pts;
1914     else if (pkt->pts != AV_NOPTS_VALUE) {
1915         decoded_frame->pts = pkt->pts;
1916         pkt->pts           = AV_NOPTS_VALUE;
1917     }
1918
1919     // preprocess audio (volume)
1920     if (audio_volume != 256) {
1921         int decoded_data_size = decoded_frame->nb_samples * avctx->channels * bps;
1922         void *samples = decoded_frame->data[0];
1923         switch (avctx->sample_fmt) {
1924         case AV_SAMPLE_FMT_U8:
1925         {
1926             uint8_t *volp = samples;
1927             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1928                 int v = (((*volp - 128) * audio_volume + 128) >> 8) + 128;
1929                 *volp++ = av_clip_uint8(v);
1930             }
1931             break;
1932         }
1933         case AV_SAMPLE_FMT_S16:
1934         {
1935             int16_t *volp = samples;
1936             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1937                 int v = ((*volp) * audio_volume + 128) >> 8;
1938                 *volp++ = av_clip_int16(v);
1939             }
1940             break;
1941         }
1942         case AV_SAMPLE_FMT_S32:
1943         {
1944             int32_t *volp = samples;
1945             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1946                 int64_t v = (((int64_t)*volp * audio_volume + 128) >> 8);
1947                 *volp++ = av_clipl_int32(v);
1948             }
1949             break;
1950         }
1951         case AV_SAMPLE_FMT_FLT:
1952         {
1953             float *volp = samples;
1954             float scale = audio_volume / 256.f;
1955             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1956                 *volp++ *= scale;
1957             }
1958             break;
1959         }
1960         case AV_SAMPLE_FMT_DBL:
1961         {
1962             double *volp = samples;
1963             double scale = audio_volume / 256.;
1964             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1965                 *volp++ *= scale;
1966             }
1967             break;
1968         }
1969         default:
1970             av_log(NULL, AV_LOG_FATAL,
1971                    "Audio volume adjustment on sample format %s is not supported.\n",
1972                    av_get_sample_fmt_name(ist->st->codec->sample_fmt));
1973             exit_program(1);
1974         }
1975     }
1976
1977     rate_emu_sleep(ist);
1978
1979     resample_changed = ist->resample_sample_fmt     != decoded_frame->format         ||
1980                        ist->resample_channels       != avctx->channels               ||
1981                        ist->resample_channel_layout != decoded_frame->channel_layout ||
1982                        ist->resample_sample_rate    != decoded_frame->sample_rate;
1983     if (resample_changed) {
1984         char layout1[64], layout2[64];
1985
1986         if (!guess_input_channel_layout(ist)) {
1987             av_log(NULL, AV_LOG_FATAL, "Unable to find default channel "
1988                    "layout for Input Stream #%d.%d\n", ist->file_index,
1989                    ist->st->index);
1990             exit_program(1);
1991         }
1992         decoded_frame->channel_layout = avctx->channel_layout;
1993
1994         av_get_channel_layout_string(layout1, sizeof(layout1), ist->resample_channels,
1995                                      ist->resample_channel_layout);
1996         av_get_channel_layout_string(layout2, sizeof(layout2), avctx->channels,
1997                                      decoded_frame->channel_layout);
1998
1999         av_log(NULL, AV_LOG_INFO,
2000                "Input stream #%d:%d frame changed from rate:%d fmt:%s ch:%d chl:%s to rate:%d fmt:%s ch:%d chl:%s\n",
2001                ist->file_index, ist->st->index,
2002                ist->resample_sample_rate,  av_get_sample_fmt_name(ist->resample_sample_fmt),
2003                ist->resample_channels, layout1,
2004                decoded_frame->sample_rate, av_get_sample_fmt_name(decoded_frame->format),
2005                avctx->channels, layout2);
2006
2007         ist->resample_sample_fmt     = decoded_frame->format;
2008         ist->resample_sample_rate    = decoded_frame->sample_rate;
2009         ist->resample_channel_layout = decoded_frame->channel_layout;
2010         ist->resample_channels       = avctx->channels;
2011
2012         for (i = 0; i < nb_filtergraphs; i++)
2013             if (ist_in_filtergraph(filtergraphs[i], ist) &&
2014                 configure_filtergraph(filtergraphs[i]) < 0) {
2015                 av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
2016                 exit_program(1);
2017             }
2018     }
2019
2020     for (i = 0; i < ist->nb_filters; i++)
2021         av_buffersrc_write_frame(ist->filters[i]->filter, decoded_frame);
2022
2023     return ret;
2024 }
2025
2026 static int decode_video(InputStream *ist, AVPacket *pkt, int *got_output)
2027 {
2028     AVFrame *decoded_frame;
2029     void *buffer_to_free = NULL;
2030     int i, ret = 0, resample_changed;
2031     float quality;
2032
2033     if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
2034         return AVERROR(ENOMEM);
2035     else
2036         avcodec_get_frame_defaults(ist->decoded_frame);
2037     decoded_frame = ist->decoded_frame;
2038
2039     ret = avcodec_decode_video2(ist->st->codec,
2040                                 decoded_frame, got_output, pkt);
2041     if (ret < 0)
2042         return ret;
2043
2044     quality = same_quant ? decoded_frame->quality : 0;
2045     if (!*got_output) {
2046         /* no picture yet */
2047         if (!pkt->size)
2048             for (i = 0; i < ist->nb_filters; i++)
2049                 av_buffersrc_buffer(ist->filters[i]->filter, NULL);
2050         return ret;
2051     }
2052     decoded_frame->pts = guess_correct_pts(&ist->pts_ctx, decoded_frame->pkt_pts,
2053                                            decoded_frame->pkt_dts);
2054     pkt->size = 0;
2055     pre_process_video_frame(ist, (AVPicture *)decoded_frame, &buffer_to_free);
2056
2057     rate_emu_sleep(ist);
2058
2059     if (ist->st->sample_aspect_ratio.num)
2060         decoded_frame->sample_aspect_ratio = ist->st->sample_aspect_ratio;
2061
2062     resample_changed = ist->resample_width   != decoded_frame->width  ||
2063                        ist->resample_height  != decoded_frame->height ||
2064                        ist->resample_pix_fmt != decoded_frame->format;
2065     if (resample_changed) {
2066         av_log(NULL, AV_LOG_INFO,
2067                "Input stream #%d:%d frame changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
2068                ist->file_index, ist->st->index,
2069                ist->resample_width,  ist->resample_height,  av_get_pix_fmt_name(ist->resample_pix_fmt),
2070                decoded_frame->width, decoded_frame->height, av_get_pix_fmt_name(decoded_frame->format));
2071
2072         ist->resample_width   = decoded_frame->width;
2073         ist->resample_height  = decoded_frame->height;
2074         ist->resample_pix_fmt = decoded_frame->format;
2075
2076         for (i = 0; i < nb_filtergraphs; i++)
2077             if (ist_in_filtergraph(filtergraphs[i], ist) &&
2078                 configure_filtergraph(filtergraphs[i]) < 0) {
2079                 av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
2080                 exit_program(1);
2081             }
2082     }
2083
2084     for (i = 0; i < ist->nb_filters; i++) {
2085         // XXX what an ugly hack
2086         if (ist->filters[i]->graph->nb_outputs == 1)
2087             ist->filters[i]->graph->outputs[0]->ost->last_quality = quality;
2088
2089         if (ist->st->codec->codec->capabilities & CODEC_CAP_DR1) {
2090             FrameBuffer      *buf = decoded_frame->opaque;
2091             AVFilterBufferRef *fb = avfilter_get_video_buffer_ref_from_arrays(
2092                                         decoded_frame->data, decoded_frame->linesize,
2093                                         AV_PERM_READ | AV_PERM_PRESERVE,
2094                                         ist->st->codec->width, ist->st->codec->height,
2095                                         ist->st->codec->pix_fmt);
2096
2097             avfilter_copy_frame_props(fb, decoded_frame);
2098             fb->buf->priv           = buf;
2099             fb->buf->free           = filter_release_buffer;
2100
2101             buf->refcount++;
2102             av_buffersrc_buffer(ist->filters[i]->filter, fb);
2103         } else
2104             av_buffersrc_write_frame(ist->filters[i]->filter, decoded_frame);
2105     }
2106
2107     av_free(buffer_to_free);
2108     return ret;
2109 }
2110
2111 static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output)
2112 {
2113     AVSubtitle subtitle;
2114     int i, ret = avcodec_decode_subtitle2(ist->st->codec,
2115                                           &subtitle, got_output, pkt);
2116     if (ret < 0)
2117         return ret;
2118     if (!*got_output)
2119         return ret;
2120
2121     rate_emu_sleep(ist);
2122
2123     for (i = 0; i < nb_output_streams; i++) {
2124         OutputStream *ost = output_streams[i];
2125
2126         if (!check_output_constraints(ist, ost) || !ost->encoding_needed)
2127             continue;
2128
2129         do_subtitle_out(output_files[ost->file_index]->ctx, ost, ist, &subtitle, pkt->pts);
2130     }
2131
2132     avsubtitle_free(&subtitle);
2133     return ret;
2134 }
2135
2136 /* pkt = NULL means EOF (needed to flush decoder buffers) */
2137 static int output_packet(InputStream *ist, const AVPacket *pkt)
2138 {
2139     int i;
2140     int got_output;
2141     AVPacket avpkt;
2142
2143     if (ist->next_dts == AV_NOPTS_VALUE)
2144         ist->next_dts = ist->last_dts;
2145
2146     if (pkt == NULL) {
2147         /* EOF handling */
2148         av_init_packet(&avpkt);
2149         avpkt.data = NULL;
2150         avpkt.size = 0;
2151         goto handle_eof;
2152     } else {
2153         avpkt = *pkt;
2154     }
2155
2156     if (pkt->dts != AV_NOPTS_VALUE)
2157         ist->next_dts = ist->last_dts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q);
2158
2159     // while we have more to decode or while the decoder did output something on EOF
2160     while (ist->decoding_needed && (avpkt.size > 0 || (!pkt && got_output))) {
2161         int ret = 0;
2162     handle_eof:
2163
2164         ist->last_dts = ist->next_dts;
2165
2166         if (avpkt.size && avpkt.size != pkt->size) {
2167             av_log(NULL, ist->showed_multi_packet_warning ? AV_LOG_VERBOSE : AV_LOG_WARNING,
2168                    "Multiple frames in a packet from stream %d\n", pkt->stream_index);
2169             ist->showed_multi_packet_warning = 1;
2170         }
2171
2172         switch (ist->st->codec->codec_type) {
2173         case AVMEDIA_TYPE_AUDIO:
2174             ret = decode_audio    (ist, &avpkt, &got_output);
2175             break;
2176         case AVMEDIA_TYPE_VIDEO:
2177             ret = decode_video    (ist, &avpkt, &got_output);
2178             if (avpkt.duration)
2179                 ist->next_dts += av_rescale_q(avpkt.duration, ist->st->time_base, AV_TIME_BASE_Q);
2180             else if (ist->st->r_frame_rate.num)
2181                 ist->next_dts += av_rescale_q(1, (AVRational){ist->st->r_frame_rate.den,
2182                                                               ist->st->r_frame_rate.num},
2183                                               AV_TIME_BASE_Q);
2184             else if (ist->st->codec->time_base.num != 0) {
2185                 int ticks      = ist->st->parser ? ist->st->parser->repeat_pict + 1 :
2186                                                    ist->st->codec->ticks_per_frame;
2187                 ist->next_dts += av_rescale_q(ticks, ist->st->codec->time_base, AV_TIME_BASE_Q);
2188             }
2189             break;
2190         case AVMEDIA_TYPE_SUBTITLE:
2191             ret = transcode_subtitles(ist, &avpkt, &got_output);
2192             break;
2193         default:
2194             return -1;
2195         }
2196
2197         if (ret < 0)
2198             return ret;
2199         // touch data and size only if not EOF
2200         if (pkt) {
2201             avpkt.data += ret;
2202             avpkt.size -= ret;
2203         }
2204         if (!got_output) {
2205             continue;
2206         }
2207     }
2208
2209     /* handle stream copy */
2210     if (!ist->decoding_needed) {
2211         rate_emu_sleep(ist);
2212         ist->last_dts = ist->next_dts;
2213         switch (ist->st->codec->codec_type) {
2214         case AVMEDIA_TYPE_AUDIO:
2215             ist->next_dts += ((int64_t)AV_TIME_BASE * ist->st->codec->frame_size) /
2216                              ist->st->codec->sample_rate;
2217             break;
2218         case AVMEDIA_TYPE_VIDEO:
2219             if (ist->st->codec->time_base.num != 0) {
2220                 int ticks = ist->st->parser ? ist->st->parser->repeat_pict + 1 : ist->st->codec->ticks_per_frame;
2221                 ist->next_dts += ((int64_t)AV_TIME_BASE *
2222                                   ist->st->codec->time_base.num * ticks) /
2223                                   ist->st->codec->time_base.den;
2224             }
2225             break;
2226         }
2227     }
2228     for (i = 0; pkt && i < nb_output_streams; i++) {
2229         OutputStream *ost = output_streams[i];
2230
2231         if (!check_output_constraints(ist, ost) || ost->encoding_needed)
2232             continue;
2233
2234         do_streamcopy(ist, ost, pkt);
2235     }
2236
2237     return 0;
2238 }
2239
2240 static void print_sdp(void)
2241 {
2242     char sdp[2048];
2243     int i;
2244     AVFormatContext **avc = av_malloc(sizeof(*avc) * nb_output_files);
2245
2246     if (!avc)
2247         exit_program(1);
2248     for (i = 0; i < nb_output_files; i++)
2249         avc[i] = output_files[i]->ctx;
2250
2251     av_sdp_create(avc, nb_output_files, sdp, sizeof(sdp));
2252     printf("SDP:\n%s\n", sdp);
2253     fflush(stdout);
2254     av_freep(&avc);
2255 }
2256
2257 static int init_input_stream(int ist_index, char *error, int error_len)
2258 {
2259     int i;
2260     InputStream *ist = input_streams[ist_index];
2261     if (ist->decoding_needed) {
2262         AVCodec *codec = ist->dec;
2263         if (!codec) {
2264             snprintf(error, error_len, "Decoder (codec id %d) not found for input stream #%d:%d",
2265                     ist->st->codec->codec_id, ist->file_index, ist->st->index);
2266             return AVERROR(EINVAL);
2267         }
2268
2269         /* update requested sample format for the decoder based on the
2270            corresponding encoder sample format */
2271         for (i = 0; i < nb_output_streams; i++) {
2272             OutputStream *ost = output_streams[i];
2273             if (ost->source_index == ist_index) {
2274                 update_sample_fmt(ist->st->codec, codec, ost->st->codec);
2275                 break;
2276             }
2277         }
2278
2279         if (codec->type == AVMEDIA_TYPE_VIDEO && codec->capabilities & CODEC_CAP_DR1) {
2280             ist->st->codec->get_buffer     = codec_get_buffer;
2281             ist->st->codec->release_buffer = codec_release_buffer;
2282             ist->st->codec->opaque         = &ist->buffer_pool;
2283         }
2284
2285         if (!av_dict_get(ist->opts, "threads", NULL, 0))
2286             av_dict_set(&ist->opts, "threads", "auto", 0);
2287         if (avcodec_open2(ist->st->codec, codec, &ist->opts) < 0) {
2288             snprintf(error, error_len, "Error while opening decoder for input stream #%d:%d",
2289                     ist->file_index, ist->st->index);
2290             return AVERROR(EINVAL);
2291         }
2292         assert_codec_experimental(ist->st->codec, 0);
2293         assert_avoptions(ist->opts);
2294     }
2295
2296     ist->last_dts = ist->st->avg_frame_rate.num ? - ist->st->codec->has_b_frames * AV_TIME_BASE / av_q2d(ist->st->avg_frame_rate) : 0;
2297     ist->next_dts = AV_NOPTS_VALUE;
2298     init_pts_correction(&ist->pts_ctx);
2299     ist->is_start = 1;
2300
2301     return 0;
2302 }
2303
2304 static InputStream *get_input_stream(OutputStream *ost)
2305 {
2306     if (ost->source_index >= 0)
2307         return input_streams[ost->source_index];
2308
2309     if (ost->filter) {
2310         FilterGraph *fg = ost->filter->graph;
2311         int i;
2312
2313         for (i = 0; i < fg->nb_inputs; i++)
2314             if (fg->inputs[i]->ist->st->codec->codec_type == ost->st->codec->codec_type)
2315                 return fg->inputs[i]->ist;
2316     }
2317
2318     return NULL;
2319 }
2320
2321 static int transcode_init(void)
2322 {
2323     int ret = 0, i, j, k;
2324     AVFormatContext *oc;
2325     AVCodecContext *codec, *icodec;
2326     OutputStream *ost;
2327     InputStream *ist;
2328     char error[1024];
2329     int want_sdp = 1;
2330
2331     /* init framerate emulation */
2332     for (i = 0; i < nb_input_files; i++) {
2333         InputFile *ifile = input_files[i];
2334         if (ifile->rate_emu)
2335             for (j = 0; j < ifile->nb_streams; j++)
2336                 input_streams[j + ifile->ist_index]->start = av_gettime();
2337     }
2338
2339     /* output stream init */
2340     for (i = 0; i < nb_output_files; i++) {
2341         oc = output_files[i]->ctx;
2342         if (!oc->nb_streams && !(oc->oformat->flags & AVFMT_NOSTREAMS)) {
2343             av_dump_format(oc, i, oc->filename, 1);
2344             av_log(NULL, AV_LOG_ERROR, "Output file #%d does not contain any stream\n", i);
2345             return AVERROR(EINVAL);
2346         }
2347     }
2348
2349     /* init complex filtergraphs */
2350     for (i = 0; i < nb_filtergraphs; i++)
2351         if ((ret = avfilter_graph_config(filtergraphs[i]->graph, NULL)) < 0)
2352             return ret;
2353
2354     /* for each output stream, we compute the right encoding parameters */
2355     for (i = 0; i < nb_output_streams; i++) {
2356         ost = output_streams[i];
2357         oc  = output_files[ost->file_index]->ctx;
2358         ist = get_input_stream(ost);
2359
2360         if (ost->attachment_filename)
2361             continue;
2362
2363         codec  = ost->st->codec;
2364
2365         if (ist) {
2366             icodec = ist->st->codec;
2367
2368             ost->st->disposition          = ist->st->disposition;
2369             codec->bits_per_raw_sample    = icodec->bits_per_raw_sample;
2370             codec->chroma_sample_location = icodec->chroma_sample_location;
2371         }
2372
2373         if (ost->stream_copy) {
2374             uint64_t extra_size;
2375
2376             av_assert0(ist && !ost->filter);
2377
2378             extra_size = (uint64_t)icodec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE;
2379
2380             if (extra_size > INT_MAX) {
2381                 return AVERROR(EINVAL);
2382             }
2383
2384             /* if stream_copy is selected, no need to decode or encode */
2385             codec->codec_id   = icodec->codec_id;
2386             codec->codec_type = icodec->codec_type;
2387
2388             if (!codec->codec_tag) {
2389                 if (!oc->oformat->codec_tag ||
2390                      av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == codec->codec_id ||
2391                      av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0)
2392                     codec->codec_tag = icodec->codec_tag;
2393             }
2394
2395             codec->bit_rate       = icodec->bit_rate;
2396             codec->rc_max_rate    = icodec->rc_max_rate;
2397             codec->rc_buffer_size = icodec->rc_buffer_size;
2398             codec->field_order    = icodec->field_order;
2399             codec->extradata      = av_mallocz(extra_size);
2400             if (!codec->extradata) {
2401                 return AVERROR(ENOMEM);
2402             }
2403             memcpy(codec->extradata, icodec->extradata, icodec->extradata_size);
2404             codec->extradata_size = icodec->extradata_size;
2405             if (!copy_tb) {
2406                 codec->time_base      = icodec->time_base;
2407                 codec->time_base.num *= icodec->ticks_per_frame;
2408                 av_reduce(&codec->time_base.num, &codec->time_base.den,
2409                           codec->time_base.num, codec->time_base.den, INT_MAX);
2410             } else
2411                 codec->time_base = ist->st->time_base;
2412
2413             switch (codec->codec_type) {
2414             case AVMEDIA_TYPE_AUDIO:
2415                 if (audio_volume != 256) {
2416                     av_log(NULL, AV_LOG_FATAL, "-acodec copy and -vol are incompatible (frames are not decoded)\n");
2417                     exit_program(1);
2418                 }
2419                 codec->channel_layout     = icodec->channel_layout;
2420                 codec->sample_rate        = icodec->sample_rate;
2421                 codec->channels           = icodec->channels;
2422                 codec->frame_size         = icodec->frame_size;
2423                 codec->audio_service_type = icodec->audio_service_type;
2424                 codec->block_align        = icodec->block_align;
2425                 break;
2426             case AVMEDIA_TYPE_VIDEO:
2427                 codec->pix_fmt            = icodec->pix_fmt;
2428                 codec->width              = icodec->width;
2429                 codec->height             = icodec->height;
2430                 codec->has_b_frames       = icodec->has_b_frames;
2431                 if (!codec->sample_aspect_ratio.num) {
2432                     codec->sample_aspect_ratio   =
2433                     ost->st->sample_aspect_ratio =
2434                         ist->st->sample_aspect_ratio.num ? ist->st->sample_aspect_ratio :
2435                         ist->st->codec->sample_aspect_ratio.num ?
2436                         ist->st->codec->sample_aspect_ratio : (AVRational){0, 1};
2437                 }
2438                 break;
2439             case AVMEDIA_TYPE_SUBTITLE:
2440                 codec->width  = icodec->width;
2441                 codec->height = icodec->height;
2442                 break;
2443             case AVMEDIA_TYPE_DATA:
2444             case AVMEDIA_TYPE_ATTACHMENT:
2445                 break;
2446             default:
2447                 abort();
2448             }
2449         } else {
2450             if (!ost->enc) {
2451                 /* should only happen when a default codec is not present. */
2452                 snprintf(error, sizeof(error), "Automatic encoder selection "
2453                          "failed for output stream #%d:%d. Default encoder for "
2454                          "format %s is probably disabled. Please choose an "
2455                          "encoder manually.\n", ost->file_index, ost->index,
2456                          oc->oformat->name);
2457                 ret = AVERROR(EINVAL);
2458                 goto dump_format;
2459             }
2460
2461             if (ist)
2462                 ist->decoding_needed = 1;
2463             ost->encoding_needed = 1;
2464
2465             /*
2466              * We want CFR output if and only if one of those is true:
2467              * 1) user specified output framerate with -r
2468              * 2) user specified -vsync cfr
2469              * 3) output format is CFR and the user didn't force vsync to
2470              *    something else than CFR
2471              *
2472              * in such a case, set ost->frame_rate
2473              */
2474             if (codec->codec_type == AVMEDIA_TYPE_VIDEO &&
2475                 !ost->frame_rate.num && ist &&
2476                 (video_sync_method ==  VSYNC_CFR ||
2477                  (video_sync_method ==  VSYNC_AUTO &&
2478                   !(oc->oformat->flags & (AVFMT_NOTIMESTAMPS | AVFMT_VARIABLE_FPS))))) {
2479                 ost->frame_rate = ist->st->r_frame_rate.num ? ist->st->r_frame_rate : (AVRational){25, 1};
2480                 if (ost->enc && ost->enc->supported_framerates && !ost->force_fps) {
2481                     int idx = av_find_nearest_q_idx(ost->frame_rate, ost->enc->supported_framerates);
2482                     ost->frame_rate = ost->enc->supported_framerates[idx];
2483                 }
2484             }
2485
2486             if (!ost->filter &&
2487                 (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
2488                  codec->codec_type == AVMEDIA_TYPE_AUDIO)) {
2489                     FilterGraph *fg;
2490                     fg = init_simple_filtergraph(ist, ost);
2491                     if (configure_filtergraph(fg)) {
2492                         av_log(NULL, AV_LOG_FATAL, "Error opening filters!\n");
2493                         exit(1);
2494                     }
2495             }
2496
2497             switch (codec->codec_type) {
2498             case AVMEDIA_TYPE_AUDIO:
2499                 codec->sample_fmt     = ost->filter->filter->inputs[0]->format;
2500                 codec->sample_rate    = ost->filter->filter->inputs[0]->sample_rate;
2501                 codec->channel_layout = ost->filter->filter->inputs[0]->channel_layout;
2502                 codec->channels       = av_get_channel_layout_nb_channels(codec->channel_layout);
2503                 codec->time_base      = (AVRational){ 1, codec->sample_rate };
2504                 break;
2505             case AVMEDIA_TYPE_VIDEO:
2506                 codec->time_base = ost->filter->filter->inputs[0]->time_base;
2507
2508                 codec->width  = ost->filter->filter->inputs[0]->w;
2509                 codec->height = ost->filter->filter->inputs[0]->h;
2510                 codec->sample_aspect_ratio = ost->st->sample_aspect_ratio =
2511                     ost->frame_aspect_ratio ? // overridden by the -aspect cli option
2512                     av_d2q(ost->frame_aspect_ratio * codec->height/codec->width, 255) :
2513                     ost->filter->filter->inputs[0]->sample_aspect_ratio;
2514                 codec->pix_fmt = ost->filter->filter->inputs[0]->format;
2515
2516                 if (codec->width   != icodec->width  ||
2517                     codec->height  != icodec->height ||
2518                     codec->pix_fmt != icodec->pix_fmt) {
2519                     codec->bits_per_raw_sample = 0;
2520                 }
2521
2522                 break;
2523             case AVMEDIA_TYPE_SUBTITLE:
2524                 codec->time_base = (AVRational){1, 1000};
2525                 break;
2526             default:
2527                 abort();
2528                 break;
2529             }
2530             /* two pass mode */
2531             if ((codec->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2))) {
2532                 char logfilename[1024];
2533                 FILE *f;
2534
2535                 snprintf(logfilename, sizeof(logfilename), "%s-%d.log",
2536                          pass_logfilename_prefix ? pass_logfilename_prefix : DEFAULT_PASS_LOGFILENAME_PREFIX,
2537                          i);
2538                 if (!strcmp(ost->enc->name, "libx264")) {
2539                     av_dict_set(&ost->opts, "stats", logfilename, AV_DICT_DONT_OVERWRITE);
2540                 } else {
2541                     if (codec->flags & CODEC_FLAG_PASS1) {
2542                         f = fopen(logfilename, "wb");
2543                         if (!f) {
2544                             av_log(NULL, AV_LOG_FATAL, "Cannot write log file '%s' for pass-1 encoding: %s\n",
2545                                    logfilename, strerror(errno));
2546                             exit_program(1);
2547                         }
2548                         ost->logfile = f;
2549                     } else {
2550                         char  *logbuffer;
2551                         size_t logbuffer_size;
2552                         if (cmdutils_read_file(logfilename, &logbuffer, &logbuffer_size) < 0) {
2553                             av_log(NULL, AV_LOG_FATAL, "Error reading log file '%s' for pass-2 encoding\n",
2554                                    logfilename);
2555                             exit_program(1);
2556                         }
2557                         codec->stats_in = logbuffer;
2558                     }
2559                 }
2560             }
2561         }
2562     }
2563
2564     /* open each encoder */
2565     for (i = 0; i < nb_output_streams; i++) {
2566         ost = output_streams[i];
2567         if (ost->encoding_needed) {
2568             AVCodec      *codec = ost->enc;
2569             AVCodecContext *dec = NULL;
2570
2571             if ((ist = get_input_stream(ost)))
2572                 dec = ist->st->codec;
2573             if (dec && dec->subtitle_header) {
2574                 ost->st->codec->subtitle_header = av_malloc(dec->subtitle_header_size);
2575                 if (!ost->st->codec->subtitle_header) {
2576                     ret = AVERROR(ENOMEM);
2577                     goto dump_format;
2578                 }
2579                 memcpy(ost->st->codec->subtitle_header, dec->subtitle_header, dec->subtitle_header_size);
2580                 ost->st->codec->subtitle_header_size = dec->subtitle_header_size;
2581             }
2582             if (!av_dict_get(ost->opts, "threads", NULL, 0))
2583                 av_dict_set(&ost->opts, "threads", "auto", 0);
2584             if (avcodec_open2(ost->st->codec, codec, &ost->opts) < 0) {
2585                 snprintf(error, sizeof(error), "Error while opening encoder for output stream #%d:%d - maybe incorrect parameters such as bit_rate, rate, width or height",
2586                         ost->file_index, ost->index);
2587                 ret = AVERROR(EINVAL);
2588                 goto dump_format;
2589             }
2590             assert_codec_experimental(ost->st->codec, 1);
2591             assert_avoptions(ost->opts);
2592             if (ost->st->codec->bit_rate && ost->st->codec->bit_rate < 1000)
2593                 av_log(NULL, AV_LOG_WARNING, "The bitrate parameter is set too low."
2594                                              "It takes bits/s as argument, not kbits/s\n");
2595             extra_size += ost->st->codec->extradata_size;
2596
2597             if (ost->st->codec->me_threshold)
2598                 input_streams[ost->source_index]->st->codec->debug |= FF_DEBUG_MV;
2599         }
2600     }
2601
2602     /* init input streams */
2603     for (i = 0; i < nb_input_streams; i++)
2604         if ((ret = init_input_stream(i, error, sizeof(error))) < 0)
2605             goto dump_format;
2606
2607     /* discard unused programs */
2608     for (i = 0; i < nb_input_files; i++) {
2609         InputFile *ifile = input_files[i];
2610         for (j = 0; j < ifile->ctx->nb_programs; j++) {
2611             AVProgram *p = ifile->ctx->programs[j];
2612             int discard  = AVDISCARD_ALL;
2613
2614             for (k = 0; k < p->nb_stream_indexes; k++)
2615                 if (!input_streams[ifile->ist_index + p->stream_index[k]]->discard) {
2616                     discard = AVDISCARD_DEFAULT;
2617                     break;
2618                 }
2619             p->discard = discard;
2620         }
2621     }
2622
2623     /* open files and write file headers */
2624     for (i = 0; i < nb_output_files; i++) {
2625         oc = output_files[i]->ctx;
2626         oc->interrupt_callback = int_cb;
2627         if ((ret = avformat_write_header(oc, &output_files[i]->opts)) < 0) {
2628             char errbuf[128];
2629             const char *errbuf_ptr = errbuf;
2630             if (av_strerror(ret, errbuf, sizeof(errbuf)) < 0)
2631                 errbuf_ptr = strerror(AVUNERROR(ret));
2632             snprintf(error, sizeof(error), "Could not write header for output file #%d (incorrect codec parameters ?): %s", i, errbuf_ptr);
2633             ret = AVERROR(EINVAL);
2634             goto dump_format;
2635         }
2636         assert_avoptions(output_files[i]->opts);
2637         if (strcmp(oc->oformat->name, "rtp")) {
2638             want_sdp = 0;
2639         }
2640     }
2641
2642  dump_format:
2643     /* dump the file output parameters - cannot be done before in case
2644        of stream copy */
2645     for (i = 0; i < nb_output_files; i++) {
2646         av_dump_format(output_files[i]->ctx, i, output_files[i]->ctx->filename, 1);
2647     }
2648
2649     /* dump the stream mapping */
2650     av_log(NULL, AV_LOG_INFO, "Stream mapping:\n");
2651     for (i = 0; i < nb_input_streams; i++) {
2652         ist = input_streams[i];
2653
2654         for (j = 0; j < ist->nb_filters; j++) {
2655             if (ist->filters[j]->graph->graph_desc) {
2656                 av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d (%s) -> %s",
2657                        ist->file_index, ist->st->index, ist->dec ? ist->dec->name : "?",
2658                        ist->filters[j]->name);
2659                 if (nb_filtergraphs > 1)
2660                     av_log(NULL, AV_LOG_INFO, " (graph %d)", ist->filters[j]->graph->index);
2661                 av_log(NULL, AV_LOG_INFO, "\n");
2662             }
2663         }
2664     }
2665
2666     for (i = 0; i < nb_output_streams; i++) {
2667         ost = output_streams[i];
2668
2669         if (ost->attachment_filename) {
2670             /* an attached file */
2671             av_log(NULL, AV_LOG_INFO, "  File %s -> Stream #%d:%d\n",
2672                    ost->attachment_filename, ost->file_index, ost->index);
2673             continue;
2674         }
2675
2676         if (ost->filter && ost->filter->graph->graph_desc) {
2677             /* output from a complex graph */
2678             av_log(NULL, AV_LOG_INFO, "  %s", ost->filter->name);
2679             if (nb_filtergraphs > 1)
2680                 av_log(NULL, AV_LOG_INFO, " (graph %d)", ost->filter->graph->index);
2681
2682             av_log(NULL, AV_LOG_INFO, " -> Stream #%d:%d (%s)\n", ost->file_index,
2683                    ost->index, ost->enc ? ost->enc->name : "?");
2684             continue;
2685         }
2686
2687         av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d -> #%d:%d",
2688                input_streams[ost->source_index]->file_index,
2689                input_streams[ost->source_index]->st->index,
2690                ost->file_index,
2691                ost->index);
2692         if (ost->sync_ist != input_streams[ost->source_index])
2693             av_log(NULL, AV_LOG_INFO, " [sync #%d:%d]",
2694                    ost->sync_ist->file_index,
2695                    ost->sync_ist->st->index);
2696         if (ost->stream_copy)
2697             av_log(NULL, AV_LOG_INFO, " (copy)");
2698         else
2699             av_log(NULL, AV_LOG_INFO, " (%s -> %s)", input_streams[ost->source_index]->dec ?
2700                    input_streams[ost->source_index]->dec->name : "?",
2701                    ost->enc ? ost->enc->name : "?");
2702         av_log(NULL, AV_LOG_INFO, "\n");
2703     }
2704
2705     if (ret) {
2706         av_log(NULL, AV_LOG_ERROR, "%s\n", error);
2707         return ret;
2708     }
2709
2710     if (want_sdp) {
2711         print_sdp();
2712     }
2713
2714     return 0;
2715 }
2716
2717 /**
2718  * @return 1 if there are still streams where more output is wanted,
2719  *         0 otherwise
2720  */
2721 static int need_output(void)
2722 {
2723     int i;
2724
2725     for (i = 0; i < nb_output_streams; i++) {
2726         OutputStream *ost    = output_streams[i];
2727         OutputFile *of       = output_files[ost->file_index];
2728         AVFormatContext *os  = output_files[ost->file_index]->ctx;
2729
2730         if (ost->is_past_recording_time ||
2731             (os->pb && avio_tell(os->pb) >= of->limit_filesize))
2732             continue;
2733         if (ost->frame_number >= ost->max_frames) {
2734             int j;
2735             for (j = 0; j < of->ctx->nb_streams; j++)
2736                 output_streams[of->ost_index + j]->is_past_recording_time = 1;
2737             continue;
2738         }
2739
2740         return 1;
2741     }
2742
2743     return 0;
2744 }
2745
2746 static int select_input_file(uint8_t *no_packet)
2747 {
2748     int64_t ipts_min = INT64_MAX;
2749     int i, file_index = -1;
2750
2751     for (i = 0; i < nb_input_streams; i++) {
2752         InputStream *ist = input_streams[i];
2753         int64_t ipts     = ist->last_dts;
2754
2755         if (ist->discard || no_packet[ist->file_index])
2756             continue;
2757         if (!input_files[ist->file_index]->eof_reached) {
2758             if (ipts < ipts_min) {
2759                 ipts_min = ipts;
2760                 file_index = ist->file_index;
2761             }
2762         }
2763     }
2764
2765     return file_index;
2766 }
2767
2768 /*
2769  * The following code is the main loop of the file converter
2770  */
2771 static int transcode(void)
2772 {
2773     int ret, i;
2774     AVFormatContext *is, *os;
2775     OutputStream *ost;
2776     InputStream *ist;
2777     uint8_t *no_packet;
2778     int no_packet_count = 0;
2779     int64_t timer_start;
2780
2781     if (!(no_packet = av_mallocz(nb_input_files)))
2782         exit_program(1);
2783
2784     ret = transcode_init();
2785     if (ret < 0)
2786         goto fail;
2787
2788     av_log(NULL, AV_LOG_INFO, "Press ctrl-c to stop encoding\n");
2789     term_init();
2790
2791     timer_start = av_gettime();
2792
2793     for (; received_sigterm == 0;) {
2794         int file_index, ist_index;
2795         AVPacket pkt;
2796
2797         /* check if there's any stream where output is still needed */
2798         if (!need_output()) {
2799             av_log(NULL, AV_LOG_VERBOSE, "No more output streams to write to, finishing.\n");
2800             break;
2801         }
2802
2803         /* select the stream that we must read now */
2804         file_index = select_input_file(no_packet);
2805         /* if none, if is finished */
2806         if (file_index < 0) {
2807             if (no_packet_count) {
2808                 no_packet_count = 0;
2809                 memset(no_packet, 0, nb_input_files);
2810                 usleep(10000);
2811                 continue;
2812             }
2813             break;
2814         }
2815
2816         /* read a frame from it and output it in the fifo */
2817         is  = input_files[file_index]->ctx;
2818         ret = av_read_frame(is, &pkt);
2819         if (ret == AVERROR(EAGAIN)) {
2820             no_packet[file_index] = 1;
2821             no_packet_count++;
2822             continue;
2823         }
2824         if (ret < 0) {
2825             input_files[file_index]->eof_reached = 1;
2826
2827             for (i = 0; i < input_files[file_index]->nb_streams; i++) {
2828                 ist = input_streams[input_files[file_index]->ist_index + i];
2829                 if (ist->decoding_needed)
2830                     output_packet(ist, NULL);
2831             }
2832
2833             if (opt_shortest)
2834                 break;
2835             else
2836                 continue;
2837         }
2838
2839         no_packet_count = 0;
2840         memset(no_packet, 0, nb_input_files);
2841
2842         if (do_pkt_dump) {
2843             av_pkt_dump_log2(NULL, AV_LOG_DEBUG, &pkt, do_hex_dump,
2844                              is->streams[pkt.stream_index]);
2845         }
2846         /* the following test is needed in case new streams appear
2847            dynamically in stream : we ignore them */
2848         if (pkt.stream_index >= input_files[file_index]->nb_streams)
2849             goto discard_packet;
2850         ist_index = input_files[file_index]->ist_index + pkt.stream_index;
2851         ist = input_streams[ist_index];
2852         if (ist->discard)
2853             goto discard_packet;
2854
2855         if (pkt.dts != AV_NOPTS_VALUE)
2856             pkt.dts += av_rescale_q(input_files[ist->file_index]->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
2857         if (pkt.pts != AV_NOPTS_VALUE)
2858             pkt.pts += av_rescale_q(input_files[ist->file_index]->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
2859
2860         if (pkt.pts != AV_NOPTS_VALUE)
2861             pkt.pts *= ist->ts_scale;
2862         if (pkt.dts != AV_NOPTS_VALUE)
2863             pkt.dts *= ist->ts_scale;
2864
2865         //fprintf(stderr, "next:%"PRId64" dts:%"PRId64" off:%"PRId64" %d\n",
2866         //        ist->next_dts,
2867         //        pkt.dts, input_files[ist->file_index].ts_offset,
2868         //        ist->st->codec->codec_type);
2869         if (pkt.dts != AV_NOPTS_VALUE && ist->next_dts != AV_NOPTS_VALUE
2870             && (is->iformat->flags & AVFMT_TS_DISCONT)) {
2871             int64_t pkt_dts = av_rescale_q(pkt.dts, ist->st->time_base, AV_TIME_BASE_Q);
2872             int64_t delta   = pkt_dts - ist->next_dts;
2873             if ((FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE || pkt_dts + 1 < ist->last_dts) && !copy_ts) {
2874                 input_files[ist->file_index]->ts_offset -= delta;
2875                 av_log(NULL, AV_LOG_DEBUG,
2876                        "timestamp discontinuity %"PRId64", new offset= %"PRId64"\n",
2877                        delta, input_files[ist->file_index]->ts_offset);
2878                 pkt.dts-= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
2879                 if (pkt.pts != AV_NOPTS_VALUE)
2880                     pkt.pts-= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
2881             }
2882         }
2883
2884         // fprintf(stderr,"read #%d.%d size=%d\n", ist->file_index, ist->st->index, pkt.size);
2885         if (output_packet(ist, &pkt) < 0 || poll_filters() < 0) {
2886             av_log(NULL, AV_LOG_ERROR, "Error while decoding stream #%d:%d\n",
2887                    ist->file_index, ist->st->index);
2888             if (exit_on_error)
2889                 exit_program(1);
2890             av_free_packet(&pkt);
2891             continue;
2892         }
2893
2894     discard_packet:
2895         av_free_packet(&pkt);
2896
2897         /* dump report by using the output first video and audio streams */
2898         print_report(0, timer_start);
2899     }
2900
2901     /* at the end of stream, we must flush the decoder buffers */
2902     for (i = 0; i < nb_input_streams; i++) {
2903         ist = input_streams[i];
2904         if (!input_files[ist->file_index]->eof_reached && ist->decoding_needed) {
2905             output_packet(ist, NULL);
2906         }
2907     }
2908     poll_filters();
2909     flush_encoders();
2910
2911     term_exit();
2912
2913     /* write the trailer if needed and close file */
2914     for (i = 0; i < nb_output_files; i++) {
2915         os = output_files[i]->ctx;
2916         av_write_trailer(os);
2917     }
2918
2919     /* dump report by using the first video and audio streams */
2920     print_report(1, timer_start);
2921
2922     /* close each encoder */
2923     for (i = 0; i < nb_output_streams; i++) {
2924         ost = output_streams[i];
2925         if (ost->encoding_needed) {
2926             av_freep(&ost->st->codec->stats_in);
2927             avcodec_close(ost->st->codec);
2928         }
2929     }
2930
2931     /* close each decoder */
2932     for (i = 0; i < nb_input_streams; i++) {
2933         ist = input_streams[i];
2934         if (ist->decoding_needed) {
2935             avcodec_close(ist->st->codec);
2936         }
2937     }
2938
2939     /* finished ! */
2940     ret = 0;
2941
2942  fail:
2943     av_freep(&no_packet);
2944
2945     if (output_streams) {
2946         for (i = 0; i < nb_output_streams; i++) {
2947             ost = output_streams[i];
2948             if (ost) {
2949                 if (ost->stream_copy)
2950                     av_freep(&ost->st->codec->extradata);
2951                 if (ost->logfile) {
2952                     fclose(ost->logfile);
2953                     ost->logfile = NULL;
2954                 }
2955                 av_freep(&ost->st->codec->subtitle_header);
2956                 av_free(ost->forced_kf_pts);
2957                 av_dict_free(&ost->opts);
2958             }
2959         }
2960     }
2961     return ret;
2962 }
2963
2964 static double parse_frame_aspect_ratio(const char *arg)
2965 {
2966     int x = 0, y = 0;
2967     double ar = 0;
2968     const char *p;
2969     char *end;
2970
2971     p = strchr(arg, ':');
2972     if (p) {
2973         x = strtol(arg, &end, 10);
2974         if (end == p)
2975             y = strtol(end + 1, &end, 10);
2976         if (x > 0 && y > 0)
2977             ar = (double)x / (double)y;
2978     } else
2979         ar = strtod(arg, NULL);
2980
2981     if (!ar) {
2982         av_log(NULL, AV_LOG_FATAL, "Incorrect aspect ratio specification.\n");
2983         exit_program(1);
2984     }
2985     return ar;
2986 }
2987
2988 static int opt_audio_codec(OptionsContext *o, const char *opt, const char *arg)
2989 {
2990     return parse_option(o, "codec:a", arg, options);
2991 }
2992
2993 static int opt_video_codec(OptionsContext *o, const char *opt, const char *arg)
2994 {
2995     return parse_option(o, "codec:v", arg, options);
2996 }
2997
2998 static int opt_subtitle_codec(OptionsContext *o, const char *opt, const char *arg)
2999 {
3000     return parse_option(o, "codec:s", arg, options);
3001 }
3002
3003 static int opt_data_codec(OptionsContext *o, const char *opt, const char *arg)
3004 {
3005     return parse_option(o, "codec:d", arg, options);
3006 }
3007
3008 static int opt_map(OptionsContext *o, const char *opt, const char *arg)
3009 {
3010     StreamMap *m = NULL;
3011     int i, negative = 0, file_idx;
3012     int sync_file_idx = -1, sync_stream_idx;
3013     char *p, *sync;
3014     char *map;
3015
3016     if (*arg == '-') {
3017         negative = 1;
3018         arg++;
3019     }
3020     map = av_strdup(arg);
3021
3022     /* parse sync stream first, just pick first matching stream */
3023     if (sync = strchr(map, ',')) {
3024         *sync = 0;
3025         sync_file_idx = strtol(sync + 1, &sync, 0);
3026         if (sync_file_idx >= nb_input_files || sync_file_idx < 0) {
3027             av_log(NULL, AV_LOG_FATAL, "Invalid sync file index: %d.\n", sync_file_idx);
3028             exit_program(1);
3029         }
3030         if (*sync)
3031             sync++;
3032         for (i = 0; i < input_files[sync_file_idx]->nb_streams; i++)
3033             if (check_stream_specifier(input_files[sync_file_idx]->ctx,
3034                                        input_files[sync_file_idx]->ctx->streams[i], sync) == 1) {
3035                 sync_stream_idx = i;
3036                 break;
3037             }
3038         if (i == input_files[sync_file_idx]->nb_streams) {
3039             av_log(NULL, AV_LOG_FATAL, "Sync stream specification in map %s does not "
3040                                        "match any streams.\n", arg);
3041             exit_program(1);
3042         }
3043     }
3044
3045
3046     if (map[0] == '[') {
3047         /* this mapping refers to lavfi output */
3048         const char *c = map + 1;
3049         o->stream_maps = grow_array(o->stream_maps, sizeof(*o->stream_maps),
3050                                     &o->nb_stream_maps, o->nb_stream_maps + 1);
3051         m = &o->stream_maps[o->nb_stream_maps - 1];
3052         m->linklabel = av_get_token(&c, "]");
3053         if (!m->linklabel) {
3054             av_log(NULL, AV_LOG_ERROR, "Invalid output link label: %s.\n", map);
3055             exit_program(1);
3056         }
3057     } else {
3058         file_idx = strtol(map, &p, 0);
3059         if (file_idx >= nb_input_files || file_idx < 0) {
3060             av_log(NULL, AV_LOG_FATAL, "Invalid input file index: %d.\n", file_idx);
3061             exit_program(1);
3062         }
3063         if (negative)
3064             /* disable some already defined maps */
3065             for (i = 0; i < o->nb_stream_maps; i++) {
3066                 m = &o->stream_maps[i];
3067                 if (file_idx == m->file_index &&
3068                     check_stream_specifier(input_files[m->file_index]->ctx,
3069                                            input_files[m->file_index]->ctx->streams[m->stream_index],
3070                                            *p == ':' ? p + 1 : p) > 0)
3071                     m->disabled = 1;
3072             }
3073         else
3074             for (i = 0; i < input_files[file_idx]->nb_streams; i++) {
3075                 if (check_stream_specifier(input_files[file_idx]->ctx, input_files[file_idx]->ctx->streams[i],
3076                             *p == ':' ? p + 1 : p) <= 0)
3077                     continue;
3078                 o->stream_maps = grow_array(o->stream_maps, sizeof(*o->stream_maps),
3079                                             &o->nb_stream_maps, o->nb_stream_maps + 1);
3080                 m = &o->stream_maps[o->nb_stream_maps - 1];
3081
3082                 m->file_index   = file_idx;
3083                 m->stream_index = i;
3084
3085                 if (sync_file_idx >= 0) {
3086                     m->sync_file_index   = sync_file_idx;
3087                     m->sync_stream_index = sync_stream_idx;
3088                 } else {
3089                     m->sync_file_index   = file_idx;
3090                     m->sync_stream_index = i;
3091                 }
3092             }
3093     }
3094
3095     if (!m) {
3096         av_log(NULL, AV_LOG_FATAL, "Stream map '%s' matches no streams.\n", arg);
3097         exit_program(1);
3098     }
3099
3100     av_freep(&map);
3101     return 0;
3102 }
3103
3104 static int opt_attach(OptionsContext *o, const char *opt, const char *arg)
3105 {
3106     o->attachments = grow_array(o->attachments, sizeof(*o->attachments),
3107                                 &o->nb_attachments, o->nb_attachments + 1);
3108     o->attachments[o->nb_attachments - 1] = arg;
3109     return 0;
3110 }
3111
3112 /**
3113  * Parse a metadata specifier in arg.
3114  * @param type metadata type is written here -- g(lobal)/s(tream)/c(hapter)/p(rogram)
3115  * @param index for type c/p, chapter/program index is written here
3116  * @param stream_spec for type s, the stream specifier is written here
3117  */
3118 static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
3119 {
3120     if (*arg) {
3121         *type = *arg;
3122         switch (*arg) {
3123         case 'g':
3124             break;
3125         case 's':
3126             if (*(++arg) && *arg != ':') {
3127                 av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\n", arg);
3128                 exit_program(1);
3129             }
3130             *stream_spec = *arg == ':' ? arg + 1 : "";
3131             break;
3132         case 'c':
3133         case 'p':
3134             if (*(++arg) == ':')
3135                 *index = strtol(++arg, NULL, 0);
3136             break;
3137         default:
3138             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
3139             exit_program(1);
3140         }
3141     } else
3142         *type = 'g';
3143 }
3144
3145 static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)
3146 {
3147     AVDictionary **meta_in = NULL;
3148     AVDictionary **meta_out;
3149     int i, ret = 0;
3150     char type_in, type_out;
3151     const char *istream_spec = NULL, *ostream_spec = NULL;
3152     int idx_in = 0, idx_out = 0;
3153
3154     parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);
3155     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
3156
3157     if (type_in == 'g' || type_out == 'g')
3158         o->metadata_global_manual = 1;
3159     if (type_in == 's' || type_out == 's')
3160         o->metadata_streams_manual = 1;
3161     if (type_in == 'c' || type_out == 'c')
3162         o->metadata_chapters_manual = 1;
3163
3164 #define METADATA_CHECK_INDEX(index, nb_elems, desc)\
3165     if ((index) < 0 || (index) >= (nb_elems)) {\
3166         av_log(NULL, AV_LOG_FATAL, "Invalid %s index %d while processing metadata maps.\n",\
3167                 (desc), (index));\
3168         exit_program(1);\
3169     }
3170
3171 #define SET_DICT(type, meta, context, index)\
3172         switch (type) {\
3173         case 'g':\
3174             meta = &context->metadata;\
3175             break;\
3176         case 'c':\
3177             METADATA_CHECK_INDEX(index, context->nb_chapters, "chapter")\
3178             meta = &context->chapters[index]->metadata;\
3179             break;\
3180         case 'p':\
3181             METADATA_CHECK_INDEX(index, context->nb_programs, "program")\
3182             meta = &context->programs[index]->metadata;\
3183             break;\
3184         }\
3185
3186     SET_DICT(type_in, meta_in, ic, idx_in);
3187     SET_DICT(type_out, meta_out, oc, idx_out);
3188
3189     /* for input streams choose first matching stream */
3190     if (type_in == 's') {
3191         for (i = 0; i < ic->nb_streams; i++) {
3192             if ((ret = check_stream_specifier(ic, ic->streams[i], istream_spec)) > 0) {
3193                 meta_in = &ic->streams[i]->metadata;
3194                 break;
3195             } else if (ret < 0)
3196                 exit_program(1);
3197         }
3198         if (!meta_in) {
3199             av_log(NULL, AV_LOG_FATAL, "Stream specifier %s does not match  any streams.\n", istream_spec);
3200             exit_program(1);
3201         }
3202     }
3203
3204     if (type_out == 's') {
3205         for (i = 0; i < oc->nb_streams; i++) {
3206             if ((ret = check_stream_specifier(oc, oc->streams[i], ostream_spec)) > 0) {
3207                 meta_out = &oc->streams[i]->metadata;
3208                 av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
3209             } else if (ret < 0)
3210                 exit_program(1);
3211         }
3212     } else
3213         av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
3214
3215     return 0;
3216 }
3217
3218 static AVCodec *find_codec_or_die(const char *name, enum AVMediaType type, int encoder)
3219 {
3220     const char *codec_string = encoder ? "encoder" : "decoder";
3221     AVCodec *codec;
3222
3223     codec = encoder ?
3224         avcodec_find_encoder_by_name(name) :
3225         avcodec_find_decoder_by_name(name);
3226     if (!codec) {
3227         av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
3228         exit_program(1);
3229     }
3230     if (codec->type != type) {
3231         av_log(NULL, AV_LOG_FATAL, "Invalid %s type '%s'\n", codec_string, name);
3232         exit_program(1);
3233     }
3234     return codec;
3235 }
3236
3237 static AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVStream *st)
3238 {
3239     char *codec_name = NULL;
3240
3241     MATCH_PER_STREAM_OPT(codec_names, str, codec_name, s, st);
3242     if (codec_name) {
3243         AVCodec *codec = find_codec_or_die(codec_name, st->codec->codec_type, 0);
3244         st->codec->codec_id = codec->id;
3245         return codec;
3246     } else
3247         return avcodec_find_decoder(st->codec->codec_id);
3248 }
3249
3250 /**
3251  * Add all the streams from the given input file to the global
3252  * list of input streams.
3253  */
3254 static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
3255 {
3256     int i;
3257
3258     for (i = 0; i < ic->nb_streams; i++) {
3259         AVStream *st = ic->streams[i];
3260         AVCodecContext *dec = st->codec;
3261         InputStream *ist = av_mallocz(sizeof(*ist));
3262         char *framerate = NULL;
3263
3264         if (!ist)
3265             exit_program(1);
3266
3267         input_streams = grow_array(input_streams, sizeof(*input_streams), &nb_input_streams, nb_input_streams + 1);
3268         input_streams[nb_input_streams - 1] = ist;
3269
3270         ist->st = st;
3271         ist->file_index = nb_input_files;
3272         ist->discard = 1;
3273         st->discard  = AVDISCARD_ALL;
3274         ist->opts = filter_codec_opts(codec_opts, ist->st->codec->codec_id, ic, st);
3275
3276         ist->ts_scale = 1.0;
3277         MATCH_PER_STREAM_OPT(ts_scale, dbl, ist->ts_scale, ic, st);
3278
3279         ist->dec = choose_decoder(o, ic, st);
3280
3281         switch (dec->codec_type) {
3282         case AVMEDIA_TYPE_VIDEO:
3283             ist->resample_height  = dec->height;
3284             ist->resample_width   = dec->width;
3285             ist->resample_pix_fmt = dec->pix_fmt;
3286
3287             MATCH_PER_STREAM_OPT(frame_rates, str, framerate, ic, st);
3288             if (framerate && av_parse_video_rate(&ist->framerate,
3289                                                  framerate) < 0) {
3290                 av_log(NULL, AV_LOG_ERROR, "Error parsing framerate %s.\n",
3291                        framerate);
3292                 exit_program(1);
3293             }
3294
3295             break;
3296         case AVMEDIA_TYPE_AUDIO:
3297             guess_input_channel_layout(ist);
3298
3299             ist->resample_sample_fmt     = dec->sample_fmt;
3300             ist->resample_sample_rate    = dec->sample_rate;
3301             ist->resample_channels       = dec->channels;
3302             ist->resample_channel_layout = dec->channel_layout;
3303
3304             break;
3305         case AVMEDIA_TYPE_DATA:
3306         case AVMEDIA_TYPE_SUBTITLE:
3307         case AVMEDIA_TYPE_ATTACHMENT:
3308         case AVMEDIA_TYPE_UNKNOWN:
3309             break;
3310         default:
3311             abort();
3312         }
3313     }
3314 }
3315
3316 static void assert_file_overwrite(const char *filename)
3317 {
3318     if (!file_overwrite &&
3319         (strchr(filename, ':') == NULL || filename[1] == ':' ||
3320          av_strstart(filename, "file:", NULL))) {
3321         if (avio_check(filename, 0) == 0) {
3322             if (!using_stdin) {
3323                 fprintf(stderr,"File '%s' already exists. Overwrite ? [y/N] ", filename);
3324                 fflush(stderr);
3325                 if (!read_yesno()) {
3326                     fprintf(stderr, "Not overwriting - exiting\n");
3327                     exit_program(1);
3328                 }
3329             }
3330             else {
3331                 fprintf(stderr,"File '%s' already exists. Exiting.\n", filename);
3332                 exit_program(1);
3333             }
3334         }
3335     }
3336 }
3337
3338 static void dump_attachment(AVStream *st, const char *filename)
3339 {
3340     int ret;
3341     AVIOContext *out = NULL;
3342     AVDictionaryEntry *e;
3343
3344     if (!st->codec->extradata_size) {
3345         av_log(NULL, AV_LOG_WARNING, "No extradata to dump in stream #%d:%d.\n",
3346                nb_input_files - 1, st->index);
3347         return;
3348     }
3349     if (!*filename && (e = av_dict_get(st->metadata, "filename", NULL, 0)))
3350         filename = e->value;
3351     if (!*filename) {
3352         av_log(NULL, AV_LOG_FATAL, "No filename specified and no 'filename' tag"
3353                "in stream #%d:%d.\n", nb_input_files - 1, st->index);
3354         exit_program(1);
3355     }
3356
3357     assert_file_overwrite(filename);
3358
3359     if ((ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, &int_cb, NULL)) < 0) {
3360         av_log(NULL, AV_LOG_FATAL, "Could not open file %s for writing.\n",
3361                filename);
3362         exit_program(1);
3363     }
3364
3365     avio_write(out, st->codec->extradata, st->codec->extradata_size);
3366     avio_flush(out);
3367     avio_close(out);
3368 }
3369
3370 static int opt_input_file(OptionsContext *o, const char *opt, const char *filename)
3371 {
3372     AVFormatContext *ic;
3373     AVInputFormat *file_iformat = NULL;
3374     int err, i, ret;
3375     int64_t timestamp;
3376     uint8_t buf[128];
3377     AVDictionary **opts;
3378     int orig_nb_streams;                     // number of streams before avformat_find_stream_info
3379
3380     if (o->format) {
3381         if (!(file_iformat = av_find_input_format(o->format))) {
3382             av_log(NULL, AV_LOG_FATAL, "Unknown input format: '%s'\n", o->format);
3383             exit_program(1);
3384         }
3385     }
3386
3387     if (!strcmp(filename, "-"))
3388         filename = "pipe:";
3389
3390     using_stdin |= !strncmp(filename, "pipe:", 5) ||
3391                     !strcmp(filename, "/dev/stdin");
3392
3393     /* get default parameters from command line */
3394     ic = avformat_alloc_context();
3395     if (!ic) {
3396         print_error(filename, AVERROR(ENOMEM));
3397         exit_program(1);
3398     }
3399     if (o->nb_audio_sample_rate) {
3400         snprintf(buf, sizeof(buf), "%d", o->audio_sample_rate[o->nb_audio_sample_rate - 1].u.i);
3401         av_dict_set(&format_opts, "sample_rate", buf, 0);
3402     }
3403     if (o->nb_audio_channels) {
3404         /* because we set audio_channels based on both the "ac" and
3405          * "channel_layout" options, we need to check that the specified
3406          * demuxer actually has the "channels" option before setting it */
3407         if (file_iformat && file_iformat->priv_class &&
3408             av_opt_find(&file_iformat->priv_class, "channels", NULL, 0,
3409                         AV_OPT_SEARCH_FAKE_OBJ)) {
3410             snprintf(buf, sizeof(buf), "%d",
3411                      o->audio_channels[o->nb_audio_channels - 1].u.i);
3412             av_dict_set(&format_opts, "channels", buf, 0);
3413         }
3414     }
3415     if (o->nb_frame_rates) {
3416         /* set the format-level framerate option;
3417          * this is important for video grabbers, e.g. x11 */
3418         if (file_iformat && file_iformat->priv_class &&
3419             av_opt_find(&file_iformat->priv_class, "framerate", NULL, 0,
3420                         AV_OPT_SEARCH_FAKE_OBJ)) {
3421             av_dict_set(&format_opts, "framerate",
3422                         o->frame_rates[o->nb_frame_rates - 1].u.str, 0);
3423         }
3424     }
3425     if (o->nb_frame_sizes) {
3426         av_dict_set(&format_opts, "video_size", o->frame_sizes[o->nb_frame_sizes - 1].u.str, 0);
3427     }
3428     if (o->nb_frame_pix_fmts)
3429         av_dict_set(&format_opts, "pixel_format", o->frame_pix_fmts[o->nb_frame_pix_fmts - 1].u.str, 0);
3430
3431     ic->flags |= AVFMT_FLAG_NONBLOCK;
3432     ic->interrupt_callback = int_cb;
3433
3434     /* open the input file with generic libav function */
3435     err = avformat_open_input(&ic, filename, file_iformat, &format_opts);
3436     if (err < 0) {
3437         print_error(filename, err);
3438         exit_program(1);
3439     }
3440     assert_avoptions(format_opts);
3441
3442     /* apply forced codec ids */
3443     for (i = 0; i < ic->nb_streams; i++)
3444         choose_decoder(o, ic, ic->streams[i]);
3445
3446     /* Set AVCodecContext options for avformat_find_stream_info */
3447     opts = setup_find_stream_info_opts(ic, codec_opts);
3448     orig_nb_streams = ic->nb_streams;
3449
3450     /* If not enough info to get the stream parameters, we decode the
3451        first frames to get it. (used in mpeg case for example) */
3452     ret = avformat_find_stream_info(ic, opts);
3453     if (ret < 0) {
3454         av_log(NULL, AV_LOG_FATAL, "%s: could not find codec parameters\n", filename);
3455         avformat_close_input(&ic);
3456         exit_program(1);
3457     }
3458
3459     timestamp = o->start_time;
3460     /* add the stream start time */
3461     if (ic->start_time != AV_NOPTS_VALUE)
3462         timestamp += ic->start_time;
3463
3464     /* if seeking requested, we execute it */
3465     if (o->start_time != 0) {
3466         ret = av_seek_frame(ic, -1, timestamp, AVSEEK_FLAG_BACKWARD);
3467         if (ret < 0) {
3468             av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f\n",
3469                    filename, (double)timestamp / AV_TIME_BASE);
3470         }
3471     }
3472
3473     /* update the current parameters so that they match the one of the input stream */
3474     add_input_streams(o, ic);
3475
3476     /* dump the file content */
3477     av_dump_format(ic, nb_input_files, filename, 0);
3478
3479     input_files = grow_array(input_files, sizeof(*input_files), &nb_input_files, nb_input_files + 1);
3480     if (!(input_files[nb_input_files - 1] = av_mallocz(sizeof(*input_files[0]))))
3481         exit_program(1);
3482
3483     input_files[nb_input_files - 1]->ctx        = ic;
3484     input_files[nb_input_files - 1]->ist_index  = nb_input_streams - ic->nb_streams;
3485     input_files[nb_input_files - 1]->ts_offset  = o->input_ts_offset - (copy_ts ? 0 : timestamp);
3486     input_files[nb_input_files - 1]->nb_streams = ic->nb_streams;
3487     input_files[nb_input_files - 1]->rate_emu   = o->rate_emu;
3488
3489     for (i = 0; i < o->nb_dump_attachment; i++) {
3490         int j;
3491
3492         for (j = 0; j < ic->nb_streams; j++) {
3493             AVStream *st = ic->streams[j];
3494
3495             if (check_stream_specifier(ic, st, o->dump_attachment[i].specifier) == 1)
3496                 dump_attachment(st, o->dump_attachment[i].u.str);
3497         }
3498     }
3499
3500     for (i = 0; i < orig_nb_streams; i++)
3501         av_dict_free(&opts[i]);
3502     av_freep(&opts);
3503
3504     reset_options(o);
3505     return 0;
3506 }
3507
3508 static void parse_forced_key_frames(char *kf, OutputStream *ost,
3509                                     AVCodecContext *avctx)
3510 {
3511     char *p;
3512     int n = 1, i;
3513     int64_t t;
3514
3515     for (p = kf; *p; p++)
3516         if (*p == ',')
3517             n++;
3518     ost->forced_kf_count = n;
3519     ost->forced_kf_pts   = av_malloc(sizeof(*ost->forced_kf_pts) * n);
3520     if (!ost->forced_kf_pts) {
3521         av_log(NULL, AV_LOG_FATAL, "Could not allocate forced key frames array.\n");
3522         exit_program(1);
3523     }
3524     for (i = 0; i < n; i++) {
3525         p = i ? strchr(p, ',') + 1 : kf;
3526         t = parse_time_or_die("force_key_frames", p, 1);
3527         ost->forced_kf_pts[i] = av_rescale_q(t, AV_TIME_BASE_Q, avctx->time_base);
3528     }
3529 }
3530
3531 static uint8_t *get_line(AVIOContext *s)
3532 {
3533     AVIOContext *line;
3534     uint8_t *buf;
3535     char c;
3536
3537     if (avio_open_dyn_buf(&line) < 0) {
3538         av_log(NULL, AV_LOG_FATAL, "Could not alloc buffer for reading preset.\n");
3539         exit_program(1);
3540     }
3541
3542     while ((c = avio_r8(s)) && c != '\n')
3543         avio_w8(line, c);
3544     avio_w8(line, 0);
3545     avio_close_dyn_buf(line, &buf);
3546
3547     return buf;
3548 }
3549
3550 static int get_preset_file_2(const char *preset_name, const char *codec_name, AVIOContext **s)
3551 {
3552     int i, ret = 1;
3553     char filename[1000];
3554     const char *base[3] = { getenv("AVCONV_DATADIR"),
3555                             getenv("HOME"),
3556                             AVCONV_DATADIR,
3557                             };
3558
3559     for (i = 0; i < FF_ARRAY_ELEMS(base) && ret; i++) {
3560         if (!base[i])
3561             continue;
3562         if (codec_name) {
3563             snprintf(filename, sizeof(filename), "%s%s/%s-%s.avpreset", base[i],
3564                      i != 1 ? "" : "/.avconv", codec_name, preset_name);
3565             ret = avio_open2(s, filename, AVIO_FLAG_READ, &int_cb, NULL);
3566         }
3567         if (ret) {
3568             snprintf(filename, sizeof(filename), "%s%s/%s.avpreset", base[i],
3569                      i != 1 ? "" : "/.avconv", preset_name);
3570             ret = avio_open2(s, filename, AVIO_FLAG_READ, &int_cb, NULL);
3571         }
3572     }
3573     return ret;
3574 }
3575
3576 static void choose_encoder(OptionsContext *o, AVFormatContext *s, OutputStream *ost)
3577 {
3578     char *codec_name = NULL;
3579
3580     MATCH_PER_STREAM_OPT(codec_names, str, codec_name, s, ost->st);
3581     if (!codec_name) {
3582         ost->st->codec->codec_id = av_guess_codec(s->oformat, NULL, s->filename,
3583                                                   NULL, ost->st->codec->codec_type);
3584         ost->enc = avcodec_find_encoder(ost->st->codec->codec_id);
3585     } else if (!strcmp(codec_name, "copy"))
3586         ost->stream_copy = 1;
3587     else {
3588         ost->enc = find_codec_or_die(codec_name, ost->st->codec->codec_type, 1);
3589         ost->st->codec->codec_id = ost->enc->id;
3590     }
3591 }
3592
3593 static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, enum AVMediaType type)
3594 {
3595     OutputStream *ost;
3596     AVStream *st = avformat_new_stream(oc, NULL);
3597     int idx      = oc->nb_streams - 1, ret = 0;
3598     char *bsf = NULL, *next, *codec_tag = NULL;
3599     AVBitStreamFilterContext *bsfc, *bsfc_prev = NULL;
3600     double qscale = -1;
3601     char *buf = NULL, *arg = NULL, *preset = NULL;
3602     AVIOContext *s = NULL;
3603
3604     if (!st) {
3605         av_log(NULL, AV_LOG_FATAL, "Could not alloc stream.\n");
3606         exit_program(1);
3607     }
3608
3609     if (oc->nb_streams - 1 < o->nb_streamid_map)
3610         st->id = o->streamid_map[oc->nb_streams - 1];
3611
3612     output_streams = grow_array(output_streams, sizeof(*output_streams), &nb_output_streams,
3613                                 nb_output_streams + 1);
3614     if (!(ost = av_mallocz(sizeof(*ost))))
3615         exit_program(1);
3616     output_streams[nb_output_streams - 1] = ost;
3617
3618     ost->file_index = nb_output_files;
3619     ost->index      = idx;
3620     ost->st         = st;
3621     st->codec->codec_type = type;
3622     choose_encoder(o, oc, ost);
3623     if (ost->enc) {
3624         ost->opts  = filter_codec_opts(codec_opts, ost->enc->id, oc, st);
3625     }
3626
3627     avcodec_get_context_defaults3(st->codec, ost->enc);
3628     st->codec->codec_type = type; // XXX hack, avcodec_get_context_defaults2() sets type to unknown for stream copy
3629
3630     MATCH_PER_STREAM_OPT(presets, str, preset, oc, st);
3631     if (preset && (!(ret = get_preset_file_2(preset, ost->enc->name, &s)))) {
3632         do  {
3633             buf = get_line(s);
3634             if (!buf[0] || buf[0] == '#') {
3635                 av_free(buf);
3636                 continue;
3637             }
3638             if (!(arg = strchr(buf, '='))) {
3639                 av_log(NULL, AV_LOG_FATAL, "Invalid line found in the preset file.\n");
3640                 exit_program(1);
3641             }
3642             *arg++ = 0;
3643             av_dict_set(&ost->opts, buf, arg, AV_DICT_DONT_OVERWRITE);
3644             av_free(buf);
3645         } while (!s->eof_reached);
3646         avio_close(s);
3647     }
3648     if (ret) {
3649         av_log(NULL, AV_LOG_FATAL,
3650                "Preset %s specified for stream %d:%d, but could not be opened.\n",
3651                preset, ost->file_index, ost->index);
3652         exit_program(1);
3653     }
3654
3655     ost->max_frames = INT64_MAX;
3656     MATCH_PER_STREAM_OPT(max_frames, i64, ost->max_frames, oc, st);
3657
3658     MATCH_PER_STREAM_OPT(bitstream_filters, str, bsf, oc, st);
3659     while (bsf) {
3660         if (next = strchr(bsf, ','))
3661             *next++ = 0;
3662         if (!(bsfc = av_bitstream_filter_init(bsf))) {
3663             av_log(NULL, AV_LOG_FATAL, "Unknown bitstream filter %s\n", bsf);
3664             exit_program(1);
3665         }
3666         if (bsfc_prev)
3667             bsfc_prev->next = bsfc;
3668         else
3669             ost->bitstream_filters = bsfc;
3670
3671         bsfc_prev = bsfc;
3672         bsf       = next;
3673     }
3674
3675     MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, oc, st);
3676     if (codec_tag) {
3677         uint32_t tag = strtol(codec_tag, &next, 0);
3678         if (*next)
3679             tag = AV_RL32(codec_tag);
3680         st->codec->codec_tag = tag;
3681     }
3682
3683     MATCH_PER_STREAM_OPT(qscale, dbl, qscale, oc, st);
3684     if (qscale >= 0 || same_quant) {
3685         st->codec->flags |= CODEC_FLAG_QSCALE;
3686         st->codec->global_quality = FF_QP2LAMBDA * qscale;
3687     }
3688
3689