nutdec: const correctness for get_v_trace/get_s_trace function arguments
[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 "libavformat/avformat.h"
31 #include "libavdevice/avdevice.h"
32 #include "libswscale/swscale.h"
33 #include "libavresample/avresample.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/audioconvert.h"
36 #include "libavutil/parseutils.h"
37 #include "libavutil/samplefmt.h"
38 #include "libavutil/colorspace.h"
39 #include "libavutil/fifo.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/dict.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/pixdesc.h"
44 #include "libavutil/avstring.h"
45 #include "libavutil/libm.h"
46 #include "libavutil/imgutils.h"
47 #include "libavutil/time.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
55 #if HAVE_SYS_RESOURCE_H
56 #include <sys/types.h>
57 #include <sys/resource.h>
58 #elif HAVE_GETPROCESSTIMES
59 #include <windows.h>
60 #endif
61 #if HAVE_GETPROCESSMEMORYINFO
62 #include <windows.h>
63 #include <psapi.h>
64 #endif
65
66 #if HAVE_SYS_SELECT_H
67 #include <sys/select.h>
68 #endif
69
70 #if HAVE_PTHREADS
71 #include <pthread.h>
72 #endif
73
74 #include <time.h>
75
76 #include "avconv.h"
77 #include "cmdutils.h"
78
79 #include "libavutil/avassert.h"
80
81 const char program_name[] = "avconv";
82 const int program_birth_year = 2000;
83
84 static FILE *vstats_file;
85
86 static int64_t video_size = 0;
87 static int64_t audio_size = 0;
88 static int64_t extra_size = 0;
89 static int nb_frames_dup = 0;
90 static int nb_frames_drop = 0;
91
92
93
94 #if HAVE_PTHREADS
95 /* signal to input threads that they should exit; set by the main thread */
96 static int transcoding_finished;
97 #endif
98
99 #define DEFAULT_PASS_LOGFILENAME_PREFIX "av2pass"
100
101 InputStream **input_streams = NULL;
102 int        nb_input_streams = 0;
103 InputFile   **input_files   = NULL;
104 int        nb_input_files   = 0;
105
106 OutputStream **output_streams = NULL;
107 int         nb_output_streams = 0;
108 OutputFile   **output_files   = NULL;
109 int         nb_output_files   = 0;
110
111 FilterGraph **filtergraphs;
112 int        nb_filtergraphs;
113
114 static void term_exit(void)
115 {
116     av_log(NULL, AV_LOG_QUIET, "");
117 }
118
119 static volatile int received_sigterm = 0;
120 static volatile int received_nb_signals = 0;
121
122 static void
123 sigterm_handler(int sig)
124 {
125     received_sigterm = sig;
126     received_nb_signals++;
127     term_exit();
128 }
129
130 static void term_init(void)
131 {
132     signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
133     signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
134 #ifdef SIGXCPU
135     signal(SIGXCPU, sigterm_handler);
136 #endif
137 }
138
139 static int decode_interrupt_cb(void *ctx)
140 {
141     return received_nb_signals > 1;
142 }
143
144 const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };
145
146 void exit_program(int ret)
147 {
148     int i, j;
149
150     for (i = 0; i < nb_filtergraphs; i++) {
151         avfilter_graph_free(&filtergraphs[i]->graph);
152         for (j = 0; j < filtergraphs[i]->nb_inputs; j++) {
153             av_freep(&filtergraphs[i]->inputs[j]->name);
154             av_freep(&filtergraphs[i]->inputs[j]);
155         }
156         av_freep(&filtergraphs[i]->inputs);
157         for (j = 0; j < filtergraphs[i]->nb_outputs; j++) {
158             av_freep(&filtergraphs[i]->outputs[j]->name);
159             av_freep(&filtergraphs[i]->outputs[j]);
160         }
161         av_freep(&filtergraphs[i]->outputs);
162         av_freep(&filtergraphs[i]);
163     }
164     av_freep(&filtergraphs);
165
166     /* close files */
167     for (i = 0; i < nb_output_files; i++) {
168         AVFormatContext *s = output_files[i]->ctx;
169         if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
170             avio_close(s->pb);
171         avformat_free_context(s);
172         av_dict_free(&output_files[i]->opts);
173         av_freep(&output_files[i]);
174     }
175     for (i = 0; i < nb_output_streams; i++) {
176         AVBitStreamFilterContext *bsfc = output_streams[i]->bitstream_filters;
177         while (bsfc) {
178             AVBitStreamFilterContext *next = bsfc->next;
179             av_bitstream_filter_close(bsfc);
180             bsfc = next;
181         }
182         output_streams[i]->bitstream_filters = NULL;
183         avcodec_free_frame(&output_streams[i]->filtered_frame);
184
185         av_freep(&output_streams[i]->forced_keyframes);
186         av_freep(&output_streams[i]->avfilter);
187         av_freep(&output_streams[i]->logfile_prefix);
188         av_freep(&output_streams[i]);
189     }
190     for (i = 0; i < nb_input_files; i++) {
191         avformat_close_input(&input_files[i]->ctx);
192         av_freep(&input_files[i]);
193     }
194     for (i = 0; i < nb_input_streams; i++) {
195         avcodec_free_frame(&input_streams[i]->decoded_frame);
196         av_dict_free(&input_streams[i]->opts);
197         free_buffer_pool(&input_streams[i]->buffer_pool);
198         av_freep(&input_streams[i]->filters);
199         av_freep(&input_streams[i]);
200     }
201
202     if (vstats_file)
203         fclose(vstats_file);
204     av_free(vstats_filename);
205
206     av_freep(&input_streams);
207     av_freep(&input_files);
208     av_freep(&output_streams);
209     av_freep(&output_files);
210
211     uninit_opts();
212
213     avfilter_uninit();
214     avformat_network_deinit();
215
216     if (received_sigterm) {
217         av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\n",
218                (int) received_sigterm);
219         exit (255);
220     }
221
222     exit(ret);
223 }
224
225 void assert_avoptions(AVDictionary *m)
226 {
227     AVDictionaryEntry *t;
228     if ((t = av_dict_get(m, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
229         av_log(NULL, AV_LOG_FATAL, "Option %s not found.\n", t->key);
230         exit_program(1);
231     }
232 }
233
234 static void assert_codec_experimental(AVCodecContext *c, int encoder)
235 {
236     const char *codec_string = encoder ? "encoder" : "decoder";
237     AVCodec *codec;
238     if (c->codec->capabilities & CODEC_CAP_EXPERIMENTAL &&
239         c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
240         av_log(NULL, AV_LOG_FATAL, "%s '%s' is experimental and might produce bad "
241                 "results.\nAdd '-strict experimental' if you want to use it.\n",
242                 codec_string, c->codec->name);
243         codec = encoder ? avcodec_find_encoder(c->codec->id) : avcodec_find_decoder(c->codec->id);
244         if (!(codec->capabilities & CODEC_CAP_EXPERIMENTAL))
245             av_log(NULL, AV_LOG_FATAL, "Or use the non experimental %s '%s'.\n",
246                    codec_string, codec->name);
247         exit_program(1);
248     }
249 }
250
251 /**
252  * Update the requested input sample format based on the output sample format.
253  * This is currently only used to request float output from decoders which
254  * support multiple sample formats, one of which is AV_SAMPLE_FMT_FLT.
255  * Ideally this will be removed in the future when decoders do not do format
256  * conversion and only output in their native format.
257  */
258 static void update_sample_fmt(AVCodecContext *dec, AVCodec *dec_codec,
259                               AVCodecContext *enc)
260 {
261     /* if sample formats match or a decoder sample format has already been
262        requested, just return */
263     if (enc->sample_fmt == dec->sample_fmt ||
264         dec->request_sample_fmt > AV_SAMPLE_FMT_NONE)
265         return;
266
267     /* if decoder supports more than one output format */
268     if (dec_codec && dec_codec->sample_fmts &&
269         dec_codec->sample_fmts[0] != AV_SAMPLE_FMT_NONE &&
270         dec_codec->sample_fmts[1] != AV_SAMPLE_FMT_NONE) {
271         const enum AVSampleFormat *p;
272         int min_dec = -1, min_inc = -1;
273
274         /* find a matching sample format in the encoder */
275         for (p = dec_codec->sample_fmts; *p != AV_SAMPLE_FMT_NONE; p++) {
276             if (*p == enc->sample_fmt) {
277                 dec->request_sample_fmt = *p;
278                 return;
279             } else if (*p > enc->sample_fmt) {
280                 min_inc = FFMIN(min_inc, *p - enc->sample_fmt);
281             } else
282                 min_dec = FFMIN(min_dec, enc->sample_fmt - *p);
283         }
284
285         /* if none match, provide the one that matches quality closest */
286         dec->request_sample_fmt = min_inc > 0 ? enc->sample_fmt + min_inc :
287                                   enc->sample_fmt - min_dec;
288     }
289 }
290
291 static void write_frame(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
292 {
293     AVBitStreamFilterContext *bsfc = ost->bitstream_filters;
294     AVCodecContext          *avctx = ost->st->codec;
295     int ret;
296
297     /*
298      * Audio encoders may split the packets --  #frames in != #packets out.
299      * But there is no reordering, so we can limit the number of output packets
300      * by simply dropping them here.
301      * Counting encoded video frames needs to be done separately because of
302      * reordering, see do_video_out()
303      */
304     if (!(avctx->codec_type == AVMEDIA_TYPE_VIDEO && avctx->codec)) {
305         if (ost->frame_number >= ost->max_frames) {
306             av_free_packet(pkt);
307             return;
308         }
309         ost->frame_number++;
310     }
311
312     while (bsfc) {
313         AVPacket new_pkt = *pkt;
314         int a = av_bitstream_filter_filter(bsfc, avctx, NULL,
315                                            &new_pkt.data, &new_pkt.size,
316                                            pkt->data, pkt->size,
317                                            pkt->flags & AV_PKT_FLAG_KEY);
318         if (a > 0) {
319             av_free_packet(pkt);
320             new_pkt.destruct = av_destruct_packet;
321         } else if (a < 0) {
322             av_log(NULL, AV_LOG_ERROR, "%s failed for stream %d, codec %s",
323                    bsfc->filter->name, pkt->stream_index,
324                    avctx->codec ? avctx->codec->name : "copy");
325             print_error("", a);
326             if (exit_on_error)
327                 exit_program(1);
328         }
329         *pkt = new_pkt;
330
331         bsfc = bsfc->next;
332     }
333
334     pkt->stream_index = ost->index;
335     ret = av_interleaved_write_frame(s, pkt);
336     if (ret < 0) {
337         print_error("av_interleaved_write_frame()", ret);
338         exit_program(1);
339     }
340 }
341
342 static int check_recording_time(OutputStream *ost)
343 {
344     OutputFile *of = output_files[ost->file_index];
345
346     if (of->recording_time != INT64_MAX &&
347         av_compare_ts(ost->sync_opts - ost->first_pts, ost->st->codec->time_base, of->recording_time,
348                       AV_TIME_BASE_Q) >= 0) {
349         ost->finished = 1;
350         return 0;
351     }
352     return 1;
353 }
354
355 static void do_audio_out(AVFormatContext *s, OutputStream *ost,
356                          AVFrame *frame)
357 {
358     AVCodecContext *enc = ost->st->codec;
359     AVPacket pkt;
360     int got_packet = 0;
361
362     av_init_packet(&pkt);
363     pkt.data = NULL;
364     pkt.size = 0;
365
366     if (!check_recording_time(ost))
367         return;
368
369     if (frame->pts == AV_NOPTS_VALUE || audio_sync_method < 0)
370         frame->pts = ost->sync_opts;
371     ost->sync_opts = frame->pts + frame->nb_samples;
372
373     if (avcodec_encode_audio2(enc, &pkt, frame, &got_packet) < 0) {
374         av_log(NULL, AV_LOG_FATAL, "Audio encoding failed\n");
375         exit_program(1);
376     }
377
378     if (got_packet) {
379         if (pkt.pts != AV_NOPTS_VALUE)
380             pkt.pts      = av_rescale_q(pkt.pts,      enc->time_base, ost->st->time_base);
381         if (pkt.dts != AV_NOPTS_VALUE)
382             pkt.dts      = av_rescale_q(pkt.dts,      enc->time_base, ost->st->time_base);
383         if (pkt.duration > 0)
384             pkt.duration = av_rescale_q(pkt.duration, enc->time_base, ost->st->time_base);
385
386         write_frame(s, &pkt, ost);
387
388         audio_size += pkt.size;
389     }
390 }
391
392 static void pre_process_video_frame(InputStream *ist, AVPicture *picture, void **bufp)
393 {
394     AVCodecContext *dec;
395     AVPicture *picture2;
396     AVPicture picture_tmp;
397     uint8_t *buf = 0;
398
399     dec = ist->st->codec;
400
401     /* deinterlace : must be done before any resize */
402     if (do_deinterlace) {
403         int size;
404
405         /* create temporary picture */
406         size = avpicture_get_size(dec->pix_fmt, dec->width, dec->height);
407         buf  = av_malloc(size);
408         if (!buf)
409             return;
410
411         picture2 = &picture_tmp;
412         avpicture_fill(picture2, buf, dec->pix_fmt, dec->width, dec->height);
413
414         if (avpicture_deinterlace(picture2, picture,
415                                  dec->pix_fmt, dec->width, dec->height) < 0) {
416             /* if error, do not deinterlace */
417             av_log(NULL, AV_LOG_WARNING, "Deinterlacing failed\n");
418             av_free(buf);
419             buf = NULL;
420             picture2 = picture;
421         }
422     } else {
423         picture2 = picture;
424     }
425
426     if (picture != picture2)
427         *picture = *picture2;
428     *bufp = buf;
429 }
430
431 static void do_subtitle_out(AVFormatContext *s,
432                             OutputStream *ost,
433                             InputStream *ist,
434                             AVSubtitle *sub,
435                             int64_t pts)
436 {
437     static uint8_t *subtitle_out = NULL;
438     int subtitle_out_max_size = 1024 * 1024;
439     int subtitle_out_size, nb, i;
440     AVCodecContext *enc;
441     AVPacket pkt;
442
443     if (pts == AV_NOPTS_VALUE) {
444         av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
445         if (exit_on_error)
446             exit_program(1);
447         return;
448     }
449
450     enc = ost->st->codec;
451
452     if (!subtitle_out) {
453         subtitle_out = av_malloc(subtitle_out_max_size);
454     }
455
456     /* Note: DVB subtitle need one packet to draw them and one other
457        packet to clear them */
458     /* XXX: signal it in the codec context ? */
459     if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
460         nb = 2;
461     else
462         nb = 1;
463
464     for (i = 0; i < nb; i++) {
465         ost->sync_opts = av_rescale_q(pts, ist->st->time_base, enc->time_base);
466         if (!check_recording_time(ost))
467             return;
468
469         sub->pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q);
470         // start_display_time is required to be 0
471         sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
472         sub->end_display_time  -= sub->start_display_time;
473         sub->start_display_time = 0;
474         subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
475                                                     subtitle_out_max_size, sub);
476         if (subtitle_out_size < 0) {
477             av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
478             exit_program(1);
479         }
480
481         av_init_packet(&pkt);
482         pkt.data = subtitle_out;
483         pkt.size = subtitle_out_size;
484         pkt.pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->st->time_base);
485         if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
486             /* XXX: the pts correction is handled here. Maybe handling
487                it in the codec would be better */
488             if (i == 0)
489                 pkt.pts += 90 * sub->start_display_time;
490             else
491                 pkt.pts += 90 * sub->end_display_time;
492         }
493         write_frame(s, &pkt, ost);
494     }
495 }
496
497 static void do_video_out(AVFormatContext *s,
498                          OutputStream *ost,
499                          AVFrame *in_picture,
500                          int *frame_size, float quality)
501 {
502     int ret, format_video_sync;
503     AVPacket pkt;
504     AVCodecContext *enc = ost->st->codec;
505
506     *frame_size = 0;
507
508     format_video_sync = video_sync_method;
509     if (format_video_sync == VSYNC_AUTO)
510         format_video_sync = (s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH :
511                             (s->oformat->flags & AVFMT_VARIABLE_FPS) ? VSYNC_VFR : VSYNC_CFR;
512     if (format_video_sync != VSYNC_PASSTHROUGH &&
513         ost->frame_number &&
514         in_picture->pts != AV_NOPTS_VALUE &&
515         in_picture->pts < ost->sync_opts) {
516         nb_frames_drop++;
517         av_log(NULL, AV_LOG_VERBOSE, "*** drop!\n");
518         return;
519     }
520
521     if (in_picture->pts == AV_NOPTS_VALUE)
522         in_picture->pts = ost->sync_opts;
523     ost->sync_opts = in_picture->pts;
524
525
526     if (!ost->frame_number)
527         ost->first_pts = in_picture->pts;
528
529     av_init_packet(&pkt);
530     pkt.data = NULL;
531     pkt.size = 0;
532
533     if (!check_recording_time(ost) ||
534         ost->frame_number >= ost->max_frames)
535         return;
536
537     if (s->oformat->flags & AVFMT_RAWPICTURE &&
538         enc->codec->id == AV_CODEC_ID_RAWVIDEO) {
539         /* raw pictures are written as AVPicture structure to
540            avoid any copies. We support temporarily the older
541            method. */
542         enc->coded_frame->interlaced_frame = in_picture->interlaced_frame;
543         enc->coded_frame->top_field_first  = in_picture->top_field_first;
544         pkt.data   = (uint8_t *)in_picture;
545         pkt.size   =  sizeof(AVPicture);
546         pkt.pts    = av_rescale_q(in_picture->pts, enc->time_base, ost->st->time_base);
547         pkt.flags |= AV_PKT_FLAG_KEY;
548
549         write_frame(s, &pkt, ost);
550     } else {
551         int got_packet;
552         AVFrame big_picture;
553
554         big_picture = *in_picture;
555         /* better than nothing: use input picture interlaced
556            settings */
557         big_picture.interlaced_frame = in_picture->interlaced_frame;
558         if (ost->st->codec->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME)) {
559             if (ost->top_field_first == -1)
560                 big_picture.top_field_first = in_picture->top_field_first;
561             else
562                 big_picture.top_field_first = !!ost->top_field_first;
563         }
564
565         /* handles same_quant here. This is not correct because it may
566            not be a global option */
567         big_picture.quality = quality;
568         if (!enc->me_threshold)
569             big_picture.pict_type = 0;
570         if (ost->forced_kf_index < ost->forced_kf_count &&
571             big_picture.pts >= ost->forced_kf_pts[ost->forced_kf_index]) {
572             big_picture.pict_type = AV_PICTURE_TYPE_I;
573             ost->forced_kf_index++;
574         }
575         ret = avcodec_encode_video2(enc, &pkt, &big_picture, &got_packet);
576         if (ret < 0) {
577             av_log(NULL, AV_LOG_FATAL, "Video encoding failed\n");
578             exit_program(1);
579         }
580
581         if (got_packet) {
582             if (pkt.pts != AV_NOPTS_VALUE)
583                 pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
584             if (pkt.dts != AV_NOPTS_VALUE)
585                 pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
586
587             write_frame(s, &pkt, ost);
588             *frame_size = pkt.size;
589             video_size += pkt.size;
590
591             /* if two pass, output log */
592             if (ost->logfile && enc->stats_out) {
593                 fprintf(ost->logfile, "%s", enc->stats_out);
594             }
595         }
596     }
597     ost->sync_opts++;
598     /*
599      * For video, number of frames in == number of packets out.
600      * But there may be reordering, so we can't throw away frames on encoder
601      * flush, we need to limit them here, before they go into encoder.
602      */
603     ost->frame_number++;
604 }
605
606 static double psnr(double d)
607 {
608     return -10.0 * log(d) / log(10.0);
609 }
610
611 static void do_video_stats(AVFormatContext *os, OutputStream *ost,
612                            int frame_size)
613 {
614     AVCodecContext *enc;
615     int frame_number;
616     double ti1, bitrate, avg_bitrate;
617
618     /* this is executed just the first time do_video_stats is called */
619     if (!vstats_file) {
620         vstats_file = fopen(vstats_filename, "w");
621         if (!vstats_file) {
622             perror("fopen");
623             exit_program(1);
624         }
625     }
626
627     enc = ost->st->codec;
628     if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
629         frame_number = ost->frame_number;
630         fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality / (float)FF_QP2LAMBDA);
631         if (enc->flags&CODEC_FLAG_PSNR)
632             fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0] / (enc->width * enc->height * 255.0 * 255.0)));
633
634         fprintf(vstats_file,"f_size= %6d ", frame_size);
635         /* compute pts value */
636         ti1 = ost->sync_opts * av_q2d(enc->time_base);
637         if (ti1 < 0.01)
638             ti1 = 0.01;
639
640         bitrate     = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
641         avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
642         fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
643                (double)video_size / 1024, ti1, bitrate, avg_bitrate);
644         fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
645     }
646 }
647
648 /**
649  * Read one frame for lavfi output for ost and encode it.
650  */
651 static int poll_filter(OutputStream *ost)
652 {
653     OutputFile    *of = output_files[ost->file_index];
654     AVFilterBufferRef *picref;
655     AVFrame *filtered_frame = NULL;
656     int frame_size, ret;
657
658     if (!ost->filtered_frame && !(ost->filtered_frame = avcodec_alloc_frame())) {
659         return AVERROR(ENOMEM);
660     } else
661         avcodec_get_frame_defaults(ost->filtered_frame);
662     filtered_frame = ost->filtered_frame;
663
664     if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
665         !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
666         ret = av_buffersink_read_samples(ost->filter->filter, &picref,
667                                          ost->st->codec->frame_size);
668     else
669         ret = av_buffersink_read(ost->filter->filter, &picref);
670
671     if (ret < 0)
672         return ret;
673
674     avfilter_copy_buf_props(filtered_frame, picref);
675     if (picref->pts != AV_NOPTS_VALUE) {
676         filtered_frame->pts = av_rescale_q(picref->pts,
677                                            ost->filter->filter->inputs[0]->time_base,
678                                            ost->st->codec->time_base) -
679                               av_rescale_q(of->start_time,
680                                            AV_TIME_BASE_Q,
681                                            ost->st->codec->time_base);
682
683         if (of->start_time && filtered_frame->pts < 0) {
684             avfilter_unref_buffer(picref);
685             return 0;
686         }
687     }
688
689     switch (ost->filter->filter->inputs[0]->type) {
690     case AVMEDIA_TYPE_VIDEO:
691         if (!ost->frame_aspect_ratio)
692             ost->st->codec->sample_aspect_ratio = picref->video->pixel_aspect;
693
694         do_video_out(of->ctx, ost, filtered_frame, &frame_size,
695                      same_quant ? ost->last_quality :
696                                   ost->st->codec->global_quality);
697         if (vstats_filename && frame_size)
698             do_video_stats(of->ctx, ost, frame_size);
699         break;
700     case AVMEDIA_TYPE_AUDIO:
701         do_audio_out(of->ctx, ost, filtered_frame);
702         break;
703     default:
704         // TODO support subtitle filters
705         av_assert0(0);
706     }
707
708     avfilter_unref_buffer(picref);
709
710     return 0;
711 }
712
713 /**
714  * Read as many frames from possible from lavfi and encode them.
715  *
716  * Always read from the active stream with the lowest timestamp. If no frames
717  * are available for it then return EAGAIN and wait for more input. This way we
718  * can use lavfi sources that generate unlimited amount of frames without memory
719  * usage exploding.
720  */
721 static int poll_filters(void)
722 {
723     int i, j, ret = 0;
724
725     while (ret >= 0 && !received_sigterm) {
726         OutputStream *ost = NULL;
727         int64_t min_pts = INT64_MAX;
728
729         /* choose output stream with the lowest timestamp */
730         for (i = 0; i < nb_output_streams; i++) {
731             int64_t pts = output_streams[i]->sync_opts;
732
733             if (!output_streams[i]->filter || output_streams[i]->finished)
734                 continue;
735
736             pts = av_rescale_q(pts, output_streams[i]->st->codec->time_base,
737                                AV_TIME_BASE_Q);
738             if (pts < min_pts) {
739                 min_pts = pts;
740                 ost = output_streams[i];
741             }
742         }
743
744         if (!ost)
745             break;
746
747         ret = poll_filter(ost);
748
749         if (ret == AVERROR_EOF) {
750             OutputFile *of = output_files[ost->file_index];
751
752             ost->finished = 1;
753
754             if (of->shortest) {
755                 for (j = 0; j < of->ctx->nb_streams; j++)
756                     output_streams[of->ost_index + j]->finished = 1;
757             }
758
759             ret = 0;
760         } else if (ret == AVERROR(EAGAIN))
761             return 0;
762     }
763
764     return ret;
765 }
766
767 static void print_report(int is_last_report, int64_t timer_start)
768 {
769     char buf[1024];
770     OutputStream *ost;
771     AVFormatContext *oc;
772     int64_t total_size;
773     AVCodecContext *enc;
774     int frame_number, vid, i;
775     double bitrate, ti1, pts;
776     static int64_t last_time = -1;
777     static int qp_histogram[52];
778
779     if (!print_stats && !is_last_report)
780         return;
781
782     if (!is_last_report) {
783         int64_t cur_time;
784         /* display the report every 0.5 seconds */
785         cur_time = av_gettime();
786         if (last_time == -1) {
787             last_time = cur_time;
788             return;
789         }
790         if ((cur_time - last_time) < 500000)
791             return;
792         last_time = cur_time;
793     }
794
795
796     oc = output_files[0]->ctx;
797
798     total_size = avio_size(oc->pb);
799     if (total_size < 0) // FIXME improve avio_size() so it works with non seekable output too
800         total_size = avio_tell(oc->pb);
801
802     buf[0] = '\0';
803     ti1 = 1e10;
804     vid = 0;
805     for (i = 0; i < nb_output_streams; i++) {
806         float q = -1;
807         ost = output_streams[i];
808         enc = ost->st->codec;
809         if (!ost->stream_copy && enc->coded_frame)
810             q = enc->coded_frame->quality / (float)FF_QP2LAMBDA;
811         if (vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
812             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "q=%2.1f ", q);
813         }
814         if (!vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
815             float t = (av_gettime() - timer_start) / 1000000.0;
816
817             frame_number = ost->frame_number;
818             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "frame=%5d fps=%3d q=%3.1f ",
819                      frame_number, (t > 1) ? (int)(frame_number / t + 0.5) : 0, q);
820             if (is_last_report)
821                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "L");
822             if (qp_hist) {
823                 int j;
824                 int qp = lrintf(q);
825                 if (qp >= 0 && qp < FF_ARRAY_ELEMS(qp_histogram))
826                     qp_histogram[qp]++;
827                 for (j = 0; j < 32; j++)
828                     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%X", (int)lrintf(log2(qp_histogram[j] + 1)));
829             }
830             if (enc->flags&CODEC_FLAG_PSNR) {
831                 int j;
832                 double error, error_sum = 0;
833                 double scale, scale_sum = 0;
834                 char type[3] = { 'Y','U','V' };
835                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "PSNR=");
836                 for (j = 0; j < 3; j++) {
837                     if (is_last_report) {
838                         error = enc->error[j];
839                         scale = enc->width * enc->height * 255.0 * 255.0 * frame_number;
840                     } else {
841                         error = enc->coded_frame->error[j];
842                         scale = enc->width * enc->height * 255.0 * 255.0;
843                     }
844                     if (j)
845                         scale /= 4;
846                     error_sum += error;
847                     scale_sum += scale;
848                     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%c:%2.2f ", type[j], psnr(error / scale));
849                 }
850                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "*:%2.2f ", psnr(error_sum / scale_sum));
851             }
852             vid = 1;
853         }
854         /* compute min output value */
855         pts = (double)ost->st->pts.val * av_q2d(ost->st->time_base);
856         if ((pts < ti1) && (pts > 0))
857             ti1 = pts;
858     }
859     if (ti1 < 0.01)
860         ti1 = 0.01;
861
862     bitrate = (double)(total_size * 8) / ti1 / 1000.0;
863
864     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
865             "size=%8.0fkB time=%0.2f bitrate=%6.1fkbits/s",
866             (double)total_size / 1024, ti1, bitrate);
867
868     if (nb_frames_dup || nb_frames_drop)
869         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " dup=%d drop=%d",
870                 nb_frames_dup, nb_frames_drop);
871
872     av_log(NULL, AV_LOG_INFO, "%s    \r", buf);
873
874     fflush(stderr);
875
876     if (is_last_report) {
877         int64_t raw= audio_size + video_size + extra_size;
878         av_log(NULL, AV_LOG_INFO, "\n");
879         av_log(NULL, AV_LOG_INFO, "video:%1.0fkB audio:%1.0fkB global headers:%1.0fkB muxing overhead %f%%\n",
880                video_size / 1024.0,
881                audio_size / 1024.0,
882                extra_size / 1024.0,
883                100.0 * (total_size - raw) / raw
884         );
885     }
886 }
887
888 static void flush_encoders(void)
889 {
890     int i, ret;
891
892     for (i = 0; i < nb_output_streams; i++) {
893         OutputStream   *ost = output_streams[i];
894         AVCodecContext *enc = ost->st->codec;
895         AVFormatContext *os = output_files[ost->file_index]->ctx;
896         int stop_encoding = 0;
897
898         if (!ost->encoding_needed)
899             continue;
900
901         if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO && enc->frame_size <= 1)
902             continue;
903         if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (os->oformat->flags & AVFMT_RAWPICTURE) && enc->codec->id == AV_CODEC_ID_RAWVIDEO)
904             continue;
905
906         for (;;) {
907             int (*encode)(AVCodecContext*, AVPacket*, const AVFrame*, int*) = NULL;
908             const char *desc;
909             int64_t *size;
910
911             switch (ost->st->codec->codec_type) {
912             case AVMEDIA_TYPE_AUDIO:
913                 encode = avcodec_encode_audio2;
914                 desc   = "Audio";
915                 size   = &audio_size;
916                 break;
917             case AVMEDIA_TYPE_VIDEO:
918                 encode = avcodec_encode_video2;
919                 desc   = "Video";
920                 size   = &video_size;
921                 break;
922             default:
923                 stop_encoding = 1;
924             }
925
926             if (encode) {
927                 AVPacket pkt;
928                 int got_packet;
929                 av_init_packet(&pkt);
930                 pkt.data = NULL;
931                 pkt.size = 0;
932
933                 ret = encode(enc, &pkt, NULL, &got_packet);
934                 if (ret < 0) {
935                     av_log(NULL, AV_LOG_FATAL, "%s encoding failed\n", desc);
936                     exit_program(1);
937                 }
938                 *size += ret;
939                 if (ost->logfile && enc->stats_out) {
940                     fprintf(ost->logfile, "%s", enc->stats_out);
941                 }
942                 if (!got_packet) {
943                     stop_encoding = 1;
944                     break;
945                 }
946                 if (pkt.pts != AV_NOPTS_VALUE)
947                     pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
948                 if (pkt.dts != AV_NOPTS_VALUE)
949                     pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
950                 write_frame(os, &pkt, ost);
951             }
952
953             if (stop_encoding)
954                 break;
955         }
956     }
957 }
958
959 /*
960  * Check whether a packet from ist should be written into ost at this time
961  */
962 static int check_output_constraints(InputStream *ist, OutputStream *ost)
963 {
964     OutputFile *of = output_files[ost->file_index];
965     int ist_index  = input_files[ist->file_index]->ist_index + ist->st->index;
966
967     if (ost->source_index != ist_index)
968         return 0;
969
970     if (of->start_time && ist->last_dts < of->start_time)
971         return 0;
972
973     return 1;
974 }
975
976 static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *pkt)
977 {
978     OutputFile *of = output_files[ost->file_index];
979     int64_t ost_tb_start_time = av_rescale_q(of->start_time, AV_TIME_BASE_Q, ost->st->time_base);
980     AVPacket opkt;
981
982     av_init_packet(&opkt);
983
984     if ((!ost->frame_number && !(pkt->flags & AV_PKT_FLAG_KEY)) &&
985         !ost->copy_initial_nonkeyframes)
986         return;
987
988     if (of->recording_time != INT64_MAX &&
989         ist->last_dts >= of->recording_time + of->start_time) {
990         ost->finished = 1;
991         return;
992     }
993
994     /* force the input stream PTS */
995     if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
996         audio_size += pkt->size;
997     else if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
998         video_size += pkt->size;
999         ost->sync_opts++;
1000     }
1001
1002     if (pkt->pts != AV_NOPTS_VALUE)
1003         opkt.pts = av_rescale_q(pkt->pts, ist->st->time_base, ost->st->time_base) - ost_tb_start_time;
1004     else
1005         opkt.pts = AV_NOPTS_VALUE;
1006
1007     if (pkt->dts == AV_NOPTS_VALUE)
1008         opkt.dts = av_rescale_q(ist->last_dts, AV_TIME_BASE_Q, ost->st->time_base);
1009     else
1010         opkt.dts = av_rescale_q(pkt->dts, ist->st->time_base, ost->st->time_base);
1011     opkt.dts -= ost_tb_start_time;
1012
1013     opkt.duration = av_rescale_q(pkt->duration, ist->st->time_base, ost->st->time_base);
1014     opkt.flags    = pkt->flags;
1015
1016     // FIXME remove the following 2 lines they shall be replaced by the bitstream filters
1017     if (  ost->st->codec->codec_id != AV_CODEC_ID_H264
1018        && ost->st->codec->codec_id != AV_CODEC_ID_MPEG1VIDEO
1019        && ost->st->codec->codec_id != AV_CODEC_ID_MPEG2VIDEO
1020        && ost->st->codec->codec_id != AV_CODEC_ID_VC1
1021        ) {
1022         if (av_parser_change(ist->st->parser, ost->st->codec, &opkt.data, &opkt.size, pkt->data, pkt->size, pkt->flags & AV_PKT_FLAG_KEY))
1023             opkt.destruct = av_destruct_packet;
1024     } else {
1025         opkt.data = pkt->data;
1026         opkt.size = pkt->size;
1027     }
1028
1029     write_frame(of->ctx, &opkt, ost);
1030     ost->st->codec->frame_number++;
1031     av_free_packet(&opkt);
1032 }
1033
1034 static void rate_emu_sleep(InputStream *ist)
1035 {
1036     if (input_files[ist->file_index]->rate_emu) {
1037         int64_t pts = av_rescale(ist->last_dts, 1000000, AV_TIME_BASE);
1038         int64_t now = av_gettime() - ist->start;
1039         if (pts > now)
1040             av_usleep(pts - now);
1041     }
1042 }
1043
1044 int guess_input_channel_layout(InputStream *ist)
1045 {
1046     AVCodecContext *dec = ist->st->codec;
1047
1048     if (!dec->channel_layout) {
1049         char layout_name[256];
1050
1051         dec->channel_layout = av_get_default_channel_layout(dec->channels);
1052         if (!dec->channel_layout)
1053             return 0;
1054         av_get_channel_layout_string(layout_name, sizeof(layout_name),
1055                                      dec->channels, dec->channel_layout);
1056         av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for  Input Stream "
1057                "#%d.%d : %s\n", ist->file_index, ist->st->index, layout_name);
1058     }
1059     return 1;
1060 }
1061
1062 static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output)
1063 {
1064     AVFrame *decoded_frame;
1065     AVCodecContext *avctx = ist->st->codec;
1066     int bps = av_get_bytes_per_sample(ist->st->codec->sample_fmt);
1067     int i, ret, resample_changed;
1068
1069     if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
1070         return AVERROR(ENOMEM);
1071     else
1072         avcodec_get_frame_defaults(ist->decoded_frame);
1073     decoded_frame = ist->decoded_frame;
1074
1075     ret = avcodec_decode_audio4(avctx, decoded_frame, got_output, pkt);
1076     if (!*got_output || ret < 0) {
1077         if (!pkt->size) {
1078             for (i = 0; i < ist->nb_filters; i++)
1079                 av_buffersrc_buffer(ist->filters[i]->filter, NULL);
1080         }
1081         return ret;
1082     }
1083
1084     /* if the decoder provides a pts, use it instead of the last packet pts.
1085        the decoder could be delaying output by a packet or more. */
1086     if (decoded_frame->pts != AV_NOPTS_VALUE)
1087         ist->next_dts = decoded_frame->pts;
1088     else if (pkt->pts != AV_NOPTS_VALUE) {
1089         decoded_frame->pts = pkt->pts;
1090         pkt->pts           = AV_NOPTS_VALUE;
1091     }
1092
1093     // preprocess audio (volume)
1094     if (audio_volume != 256) {
1095         int decoded_data_size = decoded_frame->nb_samples * avctx->channels * bps;
1096         void *samples = decoded_frame->data[0];
1097         switch (avctx->sample_fmt) {
1098         case AV_SAMPLE_FMT_U8:
1099         {
1100             uint8_t *volp = samples;
1101             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1102                 int v = (((*volp - 128) * audio_volume + 128) >> 8) + 128;
1103                 *volp++ = av_clip_uint8(v);
1104             }
1105             break;
1106         }
1107         case AV_SAMPLE_FMT_S16:
1108         {
1109             int16_t *volp = samples;
1110             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1111                 int v = ((*volp) * audio_volume + 128) >> 8;
1112                 *volp++ = av_clip_int16(v);
1113             }
1114             break;
1115         }
1116         case AV_SAMPLE_FMT_S32:
1117         {
1118             int32_t *volp = samples;
1119             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1120                 int64_t v = (((int64_t)*volp * audio_volume + 128) >> 8);
1121                 *volp++ = av_clipl_int32(v);
1122             }
1123             break;
1124         }
1125         case AV_SAMPLE_FMT_FLT:
1126         {
1127             float *volp = samples;
1128             float scale = audio_volume / 256.f;
1129             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1130                 *volp++ *= scale;
1131             }
1132             break;
1133         }
1134         case AV_SAMPLE_FMT_DBL:
1135         {
1136             double *volp = samples;
1137             double scale = audio_volume / 256.;
1138             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1139                 *volp++ *= scale;
1140             }
1141             break;
1142         }
1143         default:
1144             av_log(NULL, AV_LOG_FATAL,
1145                    "Audio volume adjustment on sample format %s is not supported.\n",
1146                    av_get_sample_fmt_name(ist->st->codec->sample_fmt));
1147             exit_program(1);
1148         }
1149     }
1150
1151     rate_emu_sleep(ist);
1152
1153     resample_changed = ist->resample_sample_fmt     != decoded_frame->format         ||
1154                        ist->resample_channels       != avctx->channels               ||
1155                        ist->resample_channel_layout != decoded_frame->channel_layout ||
1156                        ist->resample_sample_rate    != decoded_frame->sample_rate;
1157     if (resample_changed) {
1158         char layout1[64], layout2[64];
1159
1160         if (!guess_input_channel_layout(ist)) {
1161             av_log(NULL, AV_LOG_FATAL, "Unable to find default channel "
1162                    "layout for Input Stream #%d.%d\n", ist->file_index,
1163                    ist->st->index);
1164             exit_program(1);
1165         }
1166         decoded_frame->channel_layout = avctx->channel_layout;
1167
1168         av_get_channel_layout_string(layout1, sizeof(layout1), ist->resample_channels,
1169                                      ist->resample_channel_layout);
1170         av_get_channel_layout_string(layout2, sizeof(layout2), avctx->channels,
1171                                      decoded_frame->channel_layout);
1172
1173         av_log(NULL, AV_LOG_INFO,
1174                "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",
1175                ist->file_index, ist->st->index,
1176                ist->resample_sample_rate,  av_get_sample_fmt_name(ist->resample_sample_fmt),
1177                ist->resample_channels, layout1,
1178                decoded_frame->sample_rate, av_get_sample_fmt_name(decoded_frame->format),
1179                avctx->channels, layout2);
1180
1181         ist->resample_sample_fmt     = decoded_frame->format;
1182         ist->resample_sample_rate    = decoded_frame->sample_rate;
1183         ist->resample_channel_layout = decoded_frame->channel_layout;
1184         ist->resample_channels       = avctx->channels;
1185
1186         for (i = 0; i < nb_filtergraphs; i++)
1187             if (ist_in_filtergraph(filtergraphs[i], ist) &&
1188                 configure_filtergraph(filtergraphs[i]) < 0) {
1189                 av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
1190                 exit_program(1);
1191             }
1192     }
1193
1194     if (decoded_frame->pts != AV_NOPTS_VALUE)
1195         decoded_frame->pts = av_rescale_q(decoded_frame->pts,
1196                                           ist->st->time_base,
1197                                           (AVRational){1, ist->st->codec->sample_rate});
1198     for (i = 0; i < ist->nb_filters; i++)
1199         av_buffersrc_write_frame(ist->filters[i]->filter, decoded_frame);
1200
1201     return ret;
1202 }
1203
1204 static int decode_video(InputStream *ist, AVPacket *pkt, int *got_output)
1205 {
1206     AVFrame *decoded_frame;
1207     void *buffer_to_free = NULL;
1208     int i, ret = 0, resample_changed;
1209     float quality;
1210
1211     if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
1212         return AVERROR(ENOMEM);
1213     else
1214         avcodec_get_frame_defaults(ist->decoded_frame);
1215     decoded_frame = ist->decoded_frame;
1216
1217     ret = avcodec_decode_video2(ist->st->codec,
1218                                 decoded_frame, got_output, pkt);
1219     if (!*got_output || ret < 0) {
1220         if (!pkt->size) {
1221             for (i = 0; i < ist->nb_filters; i++)
1222                 av_buffersrc_buffer(ist->filters[i]->filter, NULL);
1223         }
1224         return ret;
1225     }
1226
1227     quality = same_quant ? decoded_frame->quality : 0;
1228     decoded_frame->pts = guess_correct_pts(&ist->pts_ctx, decoded_frame->pkt_pts,
1229                                            decoded_frame->pkt_dts);
1230     pkt->size = 0;
1231     pre_process_video_frame(ist, (AVPicture *)decoded_frame, &buffer_to_free);
1232
1233     rate_emu_sleep(ist);
1234
1235     if (ist->st->sample_aspect_ratio.num)
1236         decoded_frame->sample_aspect_ratio = ist->st->sample_aspect_ratio;
1237
1238     resample_changed = ist->resample_width   != decoded_frame->width  ||
1239                        ist->resample_height  != decoded_frame->height ||
1240                        ist->resample_pix_fmt != decoded_frame->format;
1241     if (resample_changed) {
1242         av_log(NULL, AV_LOG_INFO,
1243                "Input stream #%d:%d frame changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
1244                ist->file_index, ist->st->index,
1245                ist->resample_width,  ist->resample_height,  av_get_pix_fmt_name(ist->resample_pix_fmt),
1246                decoded_frame->width, decoded_frame->height, av_get_pix_fmt_name(decoded_frame->format));
1247
1248         ret = poll_filters();
1249         if (ret < 0 && (ret != AVERROR_EOF && ret != AVERROR(EAGAIN)))
1250             av_log(NULL, AV_LOG_ERROR, "Error while filtering.\n");
1251
1252         ist->resample_width   = decoded_frame->width;
1253         ist->resample_height  = decoded_frame->height;
1254         ist->resample_pix_fmt = decoded_frame->format;
1255
1256         for (i = 0; i < nb_filtergraphs; i++)
1257             if (ist_in_filtergraph(filtergraphs[i], ist) &&
1258                 configure_filtergraph(filtergraphs[i]) < 0) {
1259                 av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
1260                 exit_program(1);
1261             }
1262     }
1263
1264     for (i = 0; i < ist->nb_filters; i++) {
1265         // XXX what an ugly hack
1266         if (ist->filters[i]->graph->nb_outputs == 1)
1267             ist->filters[i]->graph->outputs[0]->ost->last_quality = quality;
1268
1269         if (ist->st->codec->codec->capabilities & CODEC_CAP_DR1) {
1270             FrameBuffer      *buf = decoded_frame->opaque;
1271             AVFilterBufferRef *fb = avfilter_get_video_buffer_ref_from_arrays(
1272                                         decoded_frame->data, decoded_frame->linesize,
1273                                         AV_PERM_READ | AV_PERM_PRESERVE,
1274                                         ist->st->codec->width, ist->st->codec->height,
1275                                         ist->st->codec->pix_fmt);
1276
1277             avfilter_copy_frame_props(fb, decoded_frame);
1278             fb->buf->priv           = buf;
1279             fb->buf->free           = filter_release_buffer;
1280
1281             buf->refcount++;
1282             av_buffersrc_buffer(ist->filters[i]->filter, fb);
1283         } else
1284             av_buffersrc_write_frame(ist->filters[i]->filter, decoded_frame);
1285     }
1286
1287     av_free(buffer_to_free);
1288     return ret;
1289 }
1290
1291 static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output)
1292 {
1293     AVSubtitle subtitle;
1294     int i, ret = avcodec_decode_subtitle2(ist->st->codec,
1295                                           &subtitle, got_output, pkt);
1296     if (ret < 0)
1297         return ret;
1298     if (!*got_output)
1299         return ret;
1300
1301     rate_emu_sleep(ist);
1302
1303     for (i = 0; i < nb_output_streams; i++) {
1304         OutputStream *ost = output_streams[i];
1305
1306         if (!check_output_constraints(ist, ost) || !ost->encoding_needed)
1307             continue;
1308
1309         do_subtitle_out(output_files[ost->file_index]->ctx, ost, ist, &subtitle, pkt->pts);
1310     }
1311
1312     avsubtitle_free(&subtitle);
1313     return ret;
1314 }
1315
1316 /* pkt = NULL means EOF (needed to flush decoder buffers) */
1317 static int output_packet(InputStream *ist, const AVPacket *pkt)
1318 {
1319     int i;
1320     int got_output;
1321     AVPacket avpkt;
1322
1323     if (ist->next_dts == AV_NOPTS_VALUE)
1324         ist->next_dts = ist->last_dts;
1325
1326     if (pkt == NULL) {
1327         /* EOF handling */
1328         av_init_packet(&avpkt);
1329         avpkt.data = NULL;
1330         avpkt.size = 0;
1331         goto handle_eof;
1332     } else {
1333         avpkt = *pkt;
1334     }
1335
1336     if (pkt->dts != AV_NOPTS_VALUE)
1337         ist->next_dts = ist->last_dts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q);
1338
1339     // while we have more to decode or while the decoder did output something on EOF
1340     while (ist->decoding_needed && (avpkt.size > 0 || (!pkt && got_output))) {
1341         int ret = 0;
1342     handle_eof:
1343
1344         ist->last_dts = ist->next_dts;
1345
1346         if (avpkt.size && avpkt.size != pkt->size) {
1347             av_log(NULL, ist->showed_multi_packet_warning ? AV_LOG_VERBOSE : AV_LOG_WARNING,
1348                    "Multiple frames in a packet from stream %d\n", pkt->stream_index);
1349             ist->showed_multi_packet_warning = 1;
1350         }
1351
1352         switch (ist->st->codec->codec_type) {
1353         case AVMEDIA_TYPE_AUDIO:
1354             ret = decode_audio    (ist, &avpkt, &got_output);
1355             break;
1356         case AVMEDIA_TYPE_VIDEO:
1357             ret = decode_video    (ist, &avpkt, &got_output);
1358             if (avpkt.duration)
1359                 ist->next_dts += av_rescale_q(avpkt.duration, ist->st->time_base, AV_TIME_BASE_Q);
1360             else if (ist->st->avg_frame_rate.num)
1361                 ist->next_dts += av_rescale_q(1, av_inv_q(ist->st->avg_frame_rate),
1362                                               AV_TIME_BASE_Q);
1363             else if (ist->st->codec->time_base.num != 0) {
1364                 int ticks      = ist->st->parser ? ist->st->parser->repeat_pict + 1 :
1365                                                    ist->st->codec->ticks_per_frame;
1366                 ist->next_dts += av_rescale_q(ticks, ist->st->codec->time_base, AV_TIME_BASE_Q);
1367             }
1368             break;
1369         case AVMEDIA_TYPE_SUBTITLE:
1370             ret = transcode_subtitles(ist, &avpkt, &got_output);
1371             break;
1372         default:
1373             return -1;
1374         }
1375
1376         if (ret < 0)
1377             return ret;
1378         // touch data and size only if not EOF
1379         if (pkt) {
1380             avpkt.data += ret;
1381             avpkt.size -= ret;
1382         }
1383         if (!got_output) {
1384             continue;
1385         }
1386     }
1387
1388     /* handle stream copy */
1389     if (!ist->decoding_needed) {
1390         rate_emu_sleep(ist);
1391         ist->last_dts = ist->next_dts;
1392         switch (ist->st->codec->codec_type) {
1393         case AVMEDIA_TYPE_AUDIO:
1394             ist->next_dts += ((int64_t)AV_TIME_BASE * ist->st->codec->frame_size) /
1395                              ist->st->codec->sample_rate;
1396             break;
1397         case AVMEDIA_TYPE_VIDEO:
1398             if (ist->st->codec->time_base.num != 0) {
1399                 int ticks = ist->st->parser ? ist->st->parser->repeat_pict + 1 : ist->st->codec->ticks_per_frame;
1400                 ist->next_dts += ((int64_t)AV_TIME_BASE *
1401                                   ist->st->codec->time_base.num * ticks) /
1402                                   ist->st->codec->time_base.den;
1403             }
1404             break;
1405         }
1406     }
1407     for (i = 0; pkt && i < nb_output_streams; i++) {
1408         OutputStream *ost = output_streams[i];
1409
1410         if (!check_output_constraints(ist, ost) || ost->encoding_needed)
1411             continue;
1412
1413         do_streamcopy(ist, ost, pkt);
1414     }
1415
1416     return 0;
1417 }
1418
1419 static void print_sdp(void)
1420 {
1421     char sdp[2048];
1422     int i;
1423     AVFormatContext **avc = av_malloc(sizeof(*avc) * nb_output_files);
1424
1425     if (!avc)
1426         exit_program(1);
1427     for (i = 0; i < nb_output_files; i++)
1428         avc[i] = output_files[i]->ctx;
1429
1430     av_sdp_create(avc, nb_output_files, sdp, sizeof(sdp));
1431     printf("SDP:\n%s\n", sdp);
1432     fflush(stdout);
1433     av_freep(&avc);
1434 }
1435
1436 static int init_input_stream(int ist_index, char *error, int error_len)
1437 {
1438     int i;
1439     InputStream *ist = input_streams[ist_index];
1440     if (ist->decoding_needed) {
1441         AVCodec *codec = ist->dec;
1442         if (!codec) {
1443             snprintf(error, error_len, "Decoder (codec id %d) not found for input stream #%d:%d",
1444                     ist->st->codec->codec_id, ist->file_index, ist->st->index);
1445             return AVERROR(EINVAL);
1446         }
1447
1448         /* update requested sample format for the decoder based on the
1449            corresponding encoder sample format */
1450         for (i = 0; i < nb_output_streams; i++) {
1451             OutputStream *ost = output_streams[i];
1452             if (ost->source_index == ist_index) {
1453                 update_sample_fmt(ist->st->codec, codec, ost->st->codec);
1454                 break;
1455             }
1456         }
1457
1458         if (codec->type == AVMEDIA_TYPE_VIDEO && codec->capabilities & CODEC_CAP_DR1) {
1459             ist->st->codec->get_buffer     = codec_get_buffer;
1460             ist->st->codec->release_buffer = codec_release_buffer;
1461             ist->st->codec->opaque         = &ist->buffer_pool;
1462         }
1463
1464         if (!av_dict_get(ist->opts, "threads", NULL, 0))
1465             av_dict_set(&ist->opts, "threads", "auto", 0);
1466         if (avcodec_open2(ist->st->codec, codec, &ist->opts) < 0) {
1467             snprintf(error, error_len, "Error while opening decoder for input stream #%d:%d",
1468                     ist->file_index, ist->st->index);
1469             return AVERROR(EINVAL);
1470         }
1471         assert_codec_experimental(ist->st->codec, 0);
1472         assert_avoptions(ist->opts);
1473     }
1474
1475     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;
1476     ist->next_dts = AV_NOPTS_VALUE;
1477     init_pts_correction(&ist->pts_ctx);
1478     ist->is_start = 1;
1479
1480     return 0;
1481 }
1482
1483 static InputStream *get_input_stream(OutputStream *ost)
1484 {
1485     if (ost->source_index >= 0)
1486         return input_streams[ost->source_index];
1487
1488     if (ost->filter) {
1489         FilterGraph *fg = ost->filter->graph;
1490         int i;
1491
1492         for (i = 0; i < fg->nb_inputs; i++)
1493             if (fg->inputs[i]->ist->st->codec->codec_type == ost->st->codec->codec_type)
1494                 return fg->inputs[i]->ist;
1495     }
1496
1497     return NULL;
1498 }
1499
1500 static void parse_forced_key_frames(char *kf, OutputStream *ost,
1501                                     AVCodecContext *avctx)
1502 {
1503     char *p;
1504     int n = 1, i;
1505     int64_t t;
1506
1507     for (p = kf; *p; p++)
1508         if (*p == ',')
1509             n++;
1510     ost->forced_kf_count = n;
1511     ost->forced_kf_pts   = av_malloc(sizeof(*ost->forced_kf_pts) * n);
1512     if (!ost->forced_kf_pts) {
1513         av_log(NULL, AV_LOG_FATAL, "Could not allocate forced key frames array.\n");
1514         exit_program(1);
1515     }
1516
1517     p = kf;
1518     for (i = 0; i < n; i++) {
1519         char *next = strchr(p, ',');
1520
1521         if (next)
1522             *next++ = 0;
1523
1524         t = parse_time_or_die("force_key_frames", p, 1);
1525         ost->forced_kf_pts[i] = av_rescale_q(t, AV_TIME_BASE_Q, avctx->time_base);
1526
1527         p = next;
1528     }
1529 }
1530
1531 static int transcode_init(void)
1532 {
1533     int ret = 0, i, j, k;
1534     AVFormatContext *oc;
1535     AVCodecContext *codec;
1536     OutputStream *ost;
1537     InputStream *ist;
1538     char error[1024];
1539     int want_sdp = 1;
1540
1541     /* init framerate emulation */
1542     for (i = 0; i < nb_input_files; i++) {
1543         InputFile *ifile = input_files[i];
1544         if (ifile->rate_emu)
1545             for (j = 0; j < ifile->nb_streams; j++)
1546                 input_streams[j + ifile->ist_index]->start = av_gettime();
1547     }
1548
1549     /* output stream init */
1550     for (i = 0; i < nb_output_files; i++) {
1551         oc = output_files[i]->ctx;
1552         if (!oc->nb_streams && !(oc->oformat->flags & AVFMT_NOSTREAMS)) {
1553             av_dump_format(oc, i, oc->filename, 1);
1554             av_log(NULL, AV_LOG_ERROR, "Output file #%d does not contain any stream\n", i);
1555             return AVERROR(EINVAL);
1556         }
1557     }
1558
1559     /* init complex filtergraphs */
1560     for (i = 0; i < nb_filtergraphs; i++)
1561         if ((ret = avfilter_graph_config(filtergraphs[i]->graph, NULL)) < 0)
1562             return ret;
1563
1564     /* for each output stream, we compute the right encoding parameters */
1565     for (i = 0; i < nb_output_streams; i++) {
1566         AVCodecContext *icodec = NULL;
1567         ost = output_streams[i];
1568         oc  = output_files[ost->file_index]->ctx;
1569         ist = get_input_stream(ost);
1570
1571         if (ost->attachment_filename)
1572             continue;
1573
1574         codec  = ost->st->codec;
1575
1576         if (ist) {
1577             icodec = ist->st->codec;
1578
1579             ost->st->disposition          = ist->st->disposition;
1580             codec->bits_per_raw_sample    = icodec->bits_per_raw_sample;
1581             codec->chroma_sample_location = icodec->chroma_sample_location;
1582         }
1583
1584         if (ost->stream_copy) {
1585             uint64_t extra_size;
1586
1587             av_assert0(ist && !ost->filter);
1588
1589             extra_size = (uint64_t)icodec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE;
1590
1591             if (extra_size > INT_MAX) {
1592                 return AVERROR(EINVAL);
1593             }
1594
1595             /* if stream_copy is selected, no need to decode or encode */
1596             codec->codec_id   = icodec->codec_id;
1597             codec->codec_type = icodec->codec_type;
1598
1599             if (!codec->codec_tag) {
1600                 if (!oc->oformat->codec_tag ||
1601                      av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == codec->codec_id ||
1602                      av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0)
1603                     codec->codec_tag = icodec->codec_tag;
1604             }
1605
1606             codec->bit_rate       = icodec->bit_rate;
1607             codec->rc_max_rate    = icodec->rc_max_rate;
1608             codec->rc_buffer_size = icodec->rc_buffer_size;
1609             codec->field_order    = icodec->field_order;
1610             codec->extradata      = av_mallocz(extra_size);
1611             if (!codec->extradata) {
1612                 return AVERROR(ENOMEM);
1613             }
1614             memcpy(codec->extradata, icodec->extradata, icodec->extradata_size);
1615             codec->extradata_size = icodec->extradata_size;
1616             if (!copy_tb) {
1617                 codec->time_base      = icodec->time_base;
1618                 codec->time_base.num *= icodec->ticks_per_frame;
1619                 av_reduce(&codec->time_base.num, &codec->time_base.den,
1620                           codec->time_base.num, codec->time_base.den, INT_MAX);
1621             } else
1622                 codec->time_base = ist->st->time_base;
1623
1624             switch (codec->codec_type) {
1625             case AVMEDIA_TYPE_AUDIO:
1626                 if (audio_volume != 256) {
1627                     av_log(NULL, AV_LOG_FATAL, "-acodec copy and -vol are incompatible (frames are not decoded)\n");
1628                     exit_program(1);
1629                 }
1630                 codec->channel_layout     = icodec->channel_layout;
1631                 codec->sample_rate        = icodec->sample_rate;
1632                 codec->channels           = icodec->channels;
1633                 codec->frame_size         = icodec->frame_size;
1634                 codec->audio_service_type = icodec->audio_service_type;
1635                 codec->block_align        = icodec->block_align;
1636                 break;
1637             case AVMEDIA_TYPE_VIDEO:
1638                 codec->pix_fmt            = icodec->pix_fmt;
1639                 codec->width              = icodec->width;
1640                 codec->height             = icodec->height;
1641                 codec->has_b_frames       = icodec->has_b_frames;
1642                 if (!codec->sample_aspect_ratio.num) {
1643                     codec->sample_aspect_ratio   =
1644                     ost->st->sample_aspect_ratio =
1645                         ist->st->sample_aspect_ratio.num ? ist->st->sample_aspect_ratio :
1646                         ist->st->codec->sample_aspect_ratio.num ?
1647                         ist->st->codec->sample_aspect_ratio : (AVRational){0, 1};
1648                 }
1649                 break;
1650             case AVMEDIA_TYPE_SUBTITLE:
1651                 codec->width  = icodec->width;
1652                 codec->height = icodec->height;
1653                 break;
1654             case AVMEDIA_TYPE_DATA:
1655             case AVMEDIA_TYPE_ATTACHMENT:
1656                 break;
1657             default:
1658                 abort();
1659             }
1660         } else {
1661             if (!ost->enc) {
1662                 /* should only happen when a default codec is not present. */
1663                 snprintf(error, sizeof(error), "Automatic encoder selection "
1664                          "failed for output stream #%d:%d. Default encoder for "
1665                          "format %s is probably disabled. Please choose an "
1666                          "encoder manually.\n", ost->file_index, ost->index,
1667                          oc->oformat->name);
1668                 ret = AVERROR(EINVAL);
1669                 goto dump_format;
1670             }
1671
1672             if (ist)
1673                 ist->decoding_needed = 1;
1674             ost->encoding_needed = 1;
1675
1676             /*
1677              * We want CFR output if and only if one of those is true:
1678              * 1) user specified output framerate with -r
1679              * 2) user specified -vsync cfr
1680              * 3) output format is CFR and the user didn't force vsync to
1681              *    something else than CFR
1682              *
1683              * in such a case, set ost->frame_rate
1684              */
1685             if (codec->codec_type == AVMEDIA_TYPE_VIDEO &&
1686                 !ost->frame_rate.num && ist &&
1687                 (video_sync_method ==  VSYNC_CFR ||
1688                  (video_sync_method ==  VSYNC_AUTO &&
1689                   !(oc->oformat->flags & (AVFMT_NOTIMESTAMPS | AVFMT_VARIABLE_FPS))))) {
1690                 ost->frame_rate = ist->framerate.num ? ist->framerate :
1691                                   ist->st->avg_frame_rate.num ?
1692                                   ist->st->avg_frame_rate :
1693                                   (AVRational){25, 1};
1694
1695                 if (ost->enc && ost->enc->supported_framerates && !ost->force_fps) {
1696                     int idx = av_find_nearest_q_idx(ost->frame_rate, ost->enc->supported_framerates);
1697                     ost->frame_rate = ost->enc->supported_framerates[idx];
1698                 }
1699             }
1700
1701             if (!ost->filter &&
1702                 (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
1703                  codec->codec_type == AVMEDIA_TYPE_AUDIO)) {
1704                     FilterGraph *fg;
1705                     fg = init_simple_filtergraph(ist, ost);
1706                     if (configure_filtergraph(fg)) {
1707                         av_log(NULL, AV_LOG_FATAL, "Error opening filters!\n");
1708                         exit(1);
1709                     }
1710             }
1711
1712             switch (codec->codec_type) {
1713             case AVMEDIA_TYPE_AUDIO:
1714                 codec->sample_fmt     = ost->filter->filter->inputs[0]->format;
1715                 codec->sample_rate    = ost->filter->filter->inputs[0]->sample_rate;
1716                 codec->channel_layout = ost->filter->filter->inputs[0]->channel_layout;
1717                 codec->channels       = av_get_channel_layout_nb_channels(codec->channel_layout);
1718                 codec->time_base      = (AVRational){ 1, codec->sample_rate };
1719                 break;
1720             case AVMEDIA_TYPE_VIDEO:
1721                 codec->time_base = ost->filter->filter->inputs[0]->time_base;
1722
1723                 codec->width  = ost->filter->filter->inputs[0]->w;
1724                 codec->height = ost->filter->filter->inputs[0]->h;
1725                 codec->sample_aspect_ratio = ost->st->sample_aspect_ratio =
1726                     ost->frame_aspect_ratio ? // overridden by the -aspect cli option
1727                     av_d2q(ost->frame_aspect_ratio * codec->height/codec->width, 255) :
1728                     ost->filter->filter->inputs[0]->sample_aspect_ratio;
1729                 codec->pix_fmt = ost->filter->filter->inputs[0]->format;
1730
1731                 if (icodec &&
1732                     (codec->width   != icodec->width  ||
1733                      codec->height  != icodec->height ||
1734                      codec->pix_fmt != icodec->pix_fmt)) {
1735                     codec->bits_per_raw_sample = 0;
1736                 }
1737
1738                 if (ost->forced_keyframes)
1739                     parse_forced_key_frames(ost->forced_keyframes, ost,
1740                                             ost->st->codec);
1741                 break;
1742             case AVMEDIA_TYPE_SUBTITLE:
1743                 codec->time_base = (AVRational){1, 1000};
1744                 break;
1745             default:
1746                 abort();
1747                 break;
1748             }
1749             /* two pass mode */
1750             if ((codec->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2))) {
1751                 char logfilename[1024];
1752                 FILE *f;
1753
1754                 snprintf(logfilename, sizeof(logfilename), "%s-%d.log",
1755                          ost->logfile_prefix ? ost->logfile_prefix :
1756                                                DEFAULT_PASS_LOGFILENAME_PREFIX,
1757                          i);
1758                 if (!strcmp(ost->enc->name, "libx264")) {
1759                     av_dict_set(&ost->opts, "stats", logfilename, AV_DICT_DONT_OVERWRITE);
1760                 } else {
1761                     if (codec->flags & CODEC_FLAG_PASS1) {
1762                         f = fopen(logfilename, "wb");
1763                         if (!f) {
1764                             av_log(NULL, AV_LOG_FATAL, "Cannot write log file '%s' for pass-1 encoding: %s\n",
1765                                    logfilename, strerror(errno));
1766                             exit_program(1);
1767                         }
1768                         ost->logfile = f;
1769                     } else {
1770                         char  *logbuffer;
1771                         size_t logbuffer_size;
1772                         if (cmdutils_read_file(logfilename, &logbuffer, &logbuffer_size) < 0) {
1773                             av_log(NULL, AV_LOG_FATAL, "Error reading log file '%s' for pass-2 encoding\n",
1774                                    logfilename);
1775                             exit_program(1);
1776                         }
1777                         codec->stats_in = logbuffer;
1778                     }
1779                 }
1780             }
1781         }
1782     }
1783
1784     /* open each encoder */
1785     for (i = 0; i < nb_output_streams; i++) {
1786         ost = output_streams[i];
1787         if (ost->encoding_needed) {
1788             AVCodec      *codec = ost->enc;
1789             AVCodecContext *dec = NULL;
1790
1791             if ((ist = get_input_stream(ost)))
1792                 dec = ist->st->codec;
1793             if (dec && dec->subtitle_header) {
1794                 ost->st->codec->subtitle_header = av_malloc(dec->subtitle_header_size);
1795                 if (!ost->st->codec->subtitle_header) {
1796                     ret = AVERROR(ENOMEM);
1797                     goto dump_format;
1798                 }
1799                 memcpy(ost->st->codec->subtitle_header, dec->subtitle_header, dec->subtitle_header_size);
1800                 ost->st->codec->subtitle_header_size = dec->subtitle_header_size;
1801             }
1802             if (!av_dict_get(ost->opts, "threads", NULL, 0))
1803                 av_dict_set(&ost->opts, "threads", "auto", 0);
1804             if (avcodec_open2(ost->st->codec, codec, &ost->opts) < 0) {
1805                 snprintf(error, sizeof(error), "Error while opening encoder for output stream #%d:%d - maybe incorrect parameters such as bit_rate, rate, width or height",
1806                         ost->file_index, ost->index);
1807                 ret = AVERROR(EINVAL);
1808                 goto dump_format;
1809             }
1810             assert_codec_experimental(ost->st->codec, 1);
1811             assert_avoptions(ost->opts);
1812             if (ost->st->codec->bit_rate && ost->st->codec->bit_rate < 1000)
1813                 av_log(NULL, AV_LOG_WARNING, "The bitrate parameter is set too low."
1814                                              "It takes bits/s as argument, not kbits/s\n");
1815             extra_size += ost->st->codec->extradata_size;
1816
1817             if (ost->st->codec->me_threshold)
1818                 input_streams[ost->source_index]->st->codec->debug |= FF_DEBUG_MV;
1819         }
1820     }
1821
1822     /* init input streams */
1823     for (i = 0; i < nb_input_streams; i++)
1824         if ((ret = init_input_stream(i, error, sizeof(error))) < 0)
1825             goto dump_format;
1826
1827     /* discard unused programs */
1828     for (i = 0; i < nb_input_files; i++) {
1829         InputFile *ifile = input_files[i];
1830         for (j = 0; j < ifile->ctx->nb_programs; j++) {
1831             AVProgram *p = ifile->ctx->programs[j];
1832             int discard  = AVDISCARD_ALL;
1833
1834             for (k = 0; k < p->nb_stream_indexes; k++)
1835                 if (!input_streams[ifile->ist_index + p->stream_index[k]]->discard) {
1836                     discard = AVDISCARD_DEFAULT;
1837                     break;
1838                 }
1839             p->discard = discard;
1840         }
1841     }
1842
1843     /* open files and write file headers */
1844     for (i = 0; i < nb_output_files; i++) {
1845         oc = output_files[i]->ctx;
1846         oc->interrupt_callback = int_cb;
1847         if ((ret = avformat_write_header(oc, &output_files[i]->opts)) < 0) {
1848             char errbuf[128];
1849             const char *errbuf_ptr = errbuf;
1850             if (av_strerror(ret, errbuf, sizeof(errbuf)) < 0)
1851                 errbuf_ptr = strerror(AVUNERROR(ret));
1852             snprintf(error, sizeof(error), "Could not write header for output file #%d (incorrect codec parameters ?): %s", i, errbuf_ptr);
1853             ret = AVERROR(EINVAL);
1854             goto dump_format;
1855         }
1856         assert_avoptions(output_files[i]->opts);
1857         if (strcmp(oc->oformat->name, "rtp")) {
1858             want_sdp = 0;
1859         }
1860     }
1861
1862  dump_format:
1863     /* dump the file output parameters - cannot be done before in case
1864        of stream copy */
1865     for (i = 0; i < nb_output_files; i++) {
1866         av_dump_format(output_files[i]->ctx, i, output_files[i]->ctx->filename, 1);
1867     }
1868
1869     /* dump the stream mapping */
1870     av_log(NULL, AV_LOG_INFO, "Stream mapping:\n");
1871     for (i = 0; i < nb_input_streams; i++) {
1872         ist = input_streams[i];
1873
1874         for (j = 0; j < ist->nb_filters; j++) {
1875             if (ist->filters[j]->graph->graph_desc) {
1876                 av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d (%s) -> %s",
1877                        ist->file_index, ist->st->index, ist->dec ? ist->dec->name : "?",
1878                        ist->filters[j]->name);
1879                 if (nb_filtergraphs > 1)
1880                     av_log(NULL, AV_LOG_INFO, " (graph %d)", ist->filters[j]->graph->index);
1881                 av_log(NULL, AV_LOG_INFO, "\n");
1882             }
1883         }
1884     }
1885
1886     for (i = 0; i < nb_output_streams; i++) {
1887         ost = output_streams[i];
1888
1889         if (ost->attachment_filename) {
1890             /* an attached file */
1891             av_log(NULL, AV_LOG_INFO, "  File %s -> Stream #%d:%d\n",
1892                    ost->attachment_filename, ost->file_index, ost->index);
1893             continue;
1894         }
1895
1896         if (ost->filter && ost->filter->graph->graph_desc) {
1897             /* output from a complex graph */
1898             av_log(NULL, AV_LOG_INFO, "  %s", ost->filter->name);
1899             if (nb_filtergraphs > 1)
1900                 av_log(NULL, AV_LOG_INFO, " (graph %d)", ost->filter->graph->index);
1901
1902             av_log(NULL, AV_LOG_INFO, " -> Stream #%d:%d (%s)\n", ost->file_index,
1903                    ost->index, ost->enc ? ost->enc->name : "?");
1904             continue;
1905         }
1906
1907         av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d -> #%d:%d",
1908                input_streams[ost->source_index]->file_index,
1909                input_streams[ost->source_index]->st->index,
1910                ost->file_index,
1911                ost->index);
1912         if (ost->sync_ist != input_streams[ost->source_index])
1913             av_log(NULL, AV_LOG_INFO, " [sync #%d:%d]",
1914                    ost->sync_ist->file_index,
1915                    ost->sync_ist->st->index);
1916         if (ost->stream_copy)
1917             av_log(NULL, AV_LOG_INFO, " (copy)");
1918         else
1919             av_log(NULL, AV_LOG_INFO, " (%s -> %s)", input_streams[ost->source_index]->dec ?
1920                    input_streams[ost->source_index]->dec->name : "?",
1921                    ost->enc ? ost->enc->name : "?");
1922         av_log(NULL, AV_LOG_INFO, "\n");
1923     }
1924
1925     if (ret) {
1926         av_log(NULL, AV_LOG_ERROR, "%s\n", error);
1927         return ret;
1928     }
1929
1930     if (want_sdp) {
1931         print_sdp();
1932     }
1933
1934     return 0;
1935 }
1936
1937 /**
1938  * @return 1 if there are still streams where more output is wanted,
1939  *         0 otherwise
1940  */
1941 static int need_output(void)
1942 {
1943     int i;
1944
1945     for (i = 0; i < nb_output_streams; i++) {
1946         OutputStream *ost    = output_streams[i];
1947         OutputFile *of       = output_files[ost->file_index];
1948         AVFormatContext *os  = output_files[ost->file_index]->ctx;
1949
1950         if (ost->finished ||
1951             (os->pb && avio_tell(os->pb) >= of->limit_filesize))
1952             continue;
1953         if (ost->frame_number >= ost->max_frames) {
1954             int j;
1955             for (j = 0; j < of->ctx->nb_streams; j++)
1956                 output_streams[of->ost_index + j]->finished = 1;
1957             continue;
1958         }
1959
1960         return 1;
1961     }
1962
1963     return 0;
1964 }
1965
1966 static InputFile *select_input_file(void)
1967 {
1968     InputFile *ifile = NULL;
1969     int64_t ipts_min = INT64_MAX;
1970     int i;
1971
1972     for (i = 0; i < nb_input_streams; i++) {
1973         InputStream *ist = input_streams[i];
1974         int64_t ipts     = ist->last_dts;
1975
1976         if (ist->discard || input_files[ist->file_index]->eagain)
1977             continue;
1978         if (!input_files[ist->file_index]->eof_reached) {
1979             if (ipts < ipts_min) {
1980                 ipts_min = ipts;
1981                 ifile    = input_files[ist->file_index];
1982             }
1983         }
1984     }
1985
1986     return ifile;
1987 }
1988
1989 #if HAVE_PTHREADS
1990 static void *input_thread(void *arg)
1991 {
1992     InputFile *f = arg;
1993     int ret = 0;
1994
1995     while (!transcoding_finished && ret >= 0) {
1996         AVPacket pkt;
1997         ret = av_read_frame(f->ctx, &pkt);
1998
1999         if (ret == AVERROR(EAGAIN)) {
2000             av_usleep(10000);
2001             ret = 0;
2002             continue;
2003         } else if (ret < 0)
2004             break;
2005
2006         pthread_mutex_lock(&f->fifo_lock);
2007         while (!av_fifo_space(f->fifo))
2008             pthread_cond_wait(&f->fifo_cond, &f->fifo_lock);
2009
2010         av_dup_packet(&pkt);
2011         av_fifo_generic_write(f->fifo, &pkt, sizeof(pkt), NULL);
2012
2013         pthread_mutex_unlock(&f->fifo_lock);
2014     }
2015
2016     f->finished = 1;
2017     return NULL;
2018 }
2019
2020 static void free_input_threads(void)
2021 {
2022     int i;
2023
2024     if (nb_input_files == 1)
2025         return;
2026
2027     transcoding_finished = 1;
2028
2029     for (i = 0; i < nb_input_files; i++) {
2030         InputFile *f = input_files[i];
2031         AVPacket pkt;
2032
2033         if (!f->fifo || f->joined)
2034             continue;
2035
2036         pthread_mutex_lock(&f->fifo_lock);
2037         while (av_fifo_size(f->fifo)) {
2038             av_fifo_generic_read(f->fifo, &pkt, sizeof(pkt), NULL);
2039             av_free_packet(&pkt);
2040         }
2041         pthread_cond_signal(&f->fifo_cond);
2042         pthread_mutex_unlock(&f->fifo_lock);
2043
2044         pthread_join(f->thread, NULL);
2045         f->joined = 1;
2046
2047         while (av_fifo_size(f->fifo)) {
2048             av_fifo_generic_read(f->fifo, &pkt, sizeof(pkt), NULL);
2049             av_free_packet(&pkt);
2050         }
2051         av_fifo_free(f->fifo);
2052     }
2053 }
2054
2055 static int init_input_threads(void)
2056 {
2057     int i, ret;
2058
2059     if (nb_input_files == 1)
2060         return 0;
2061
2062     for (i = 0; i < nb_input_files; i++) {
2063         InputFile *f = input_files[i];
2064
2065         if (!(f->fifo = av_fifo_alloc(8*sizeof(AVPacket))))
2066             return AVERROR(ENOMEM);
2067
2068         pthread_mutex_init(&f->fifo_lock, NULL);
2069         pthread_cond_init (&f->fifo_cond, NULL);
2070
2071         if ((ret = pthread_create(&f->thread, NULL, input_thread, f)))
2072             return AVERROR(ret);
2073     }
2074     return 0;
2075 }
2076
2077 static int get_input_packet_mt(InputFile *f, AVPacket *pkt)
2078 {
2079     int ret = 0;
2080
2081     pthread_mutex_lock(&f->fifo_lock);
2082
2083     if (av_fifo_size(f->fifo)) {
2084         av_fifo_generic_read(f->fifo, pkt, sizeof(*pkt), NULL);
2085         pthread_cond_signal(&f->fifo_cond);
2086     } else {
2087         if (f->finished)
2088             ret = AVERROR_EOF;
2089         else
2090             ret = AVERROR(EAGAIN);
2091     }
2092
2093     pthread_mutex_unlock(&f->fifo_lock);
2094
2095     return ret;
2096 }
2097 #endif
2098
2099 static int get_input_packet(InputFile *f, AVPacket *pkt)
2100 {
2101 #if HAVE_PTHREADS
2102     if (nb_input_files > 1)
2103         return get_input_packet_mt(f, pkt);
2104 #endif
2105     return av_read_frame(f->ctx, pkt);
2106 }
2107
2108 static int got_eagain(void)
2109 {
2110     int i;
2111     for (i = 0; i < nb_input_files; i++)
2112         if (input_files[i]->eagain)
2113             return 1;
2114     return 0;
2115 }
2116
2117 static void reset_eagain(void)
2118 {
2119     int i;
2120     for (i = 0; i < nb_input_files; i++)
2121         input_files[i]->eagain = 0;
2122 }
2123
2124 /**
2125  * Read one packet from an input file and send it for
2126  * - decoding -> lavfi (audio/video)
2127  * - decoding -> encoding -> muxing (subtitles)
2128  * - muxing (streamcopy)
2129  *
2130  * @return
2131  * - 0 -- one packet was read and processed
2132  * - AVERROR(EAGAIN) -- no packets were available for selected file,
2133  *   this function should be called again
2134  * - AVERROR_EOF -- this function should not be called again
2135  */
2136 static int process_input(void)
2137 {
2138     InputFile *ifile;
2139     AVFormatContext *is;
2140     InputStream *ist;
2141     AVPacket pkt;
2142     int ret, i, j;
2143
2144     /* select the stream that we must read now */
2145     ifile = select_input_file();
2146     /* if none, if is finished */
2147     if (!ifile) {
2148         if (got_eagain()) {
2149             reset_eagain();
2150             av_usleep(10000);
2151             return AVERROR(EAGAIN);
2152         }
2153         av_log(NULL, AV_LOG_VERBOSE, "No more inputs to read from.\n");
2154         return AVERROR_EOF;
2155     }
2156
2157     is  = ifile->ctx;
2158     ret = get_input_packet(ifile, &pkt);
2159
2160     if (ret == AVERROR(EAGAIN)) {
2161         ifile->eagain = 1;
2162         return ret;
2163     }
2164     if (ret < 0) {
2165         if (ret != AVERROR_EOF) {
2166             print_error(is->filename, ret);
2167             if (exit_on_error)
2168                 exit_program(1);
2169         }
2170         ifile->eof_reached = 1;
2171
2172         for (i = 0; i < ifile->nb_streams; i++) {
2173             ist = input_streams[ifile->ist_index + i];
2174             if (ist->decoding_needed)
2175                 output_packet(ist, NULL);
2176
2177             /* mark all outputs that don't go through lavfi as finished */
2178             for (j = 0; j < nb_output_streams; j++) {
2179                 OutputStream *ost = output_streams[j];
2180
2181                 if (ost->source_index == ifile->ist_index + i &&
2182                     (ost->stream_copy || ost->enc->type == AVMEDIA_TYPE_SUBTITLE))
2183                     ost->finished= 1;
2184             }
2185         }
2186
2187         return AVERROR(EAGAIN);
2188     }
2189
2190     reset_eagain();
2191
2192     if (do_pkt_dump) {
2193         av_pkt_dump_log2(NULL, AV_LOG_DEBUG, &pkt, do_hex_dump,
2194                          is->streams[pkt.stream_index]);
2195     }
2196     /* the following test is needed in case new streams appear
2197        dynamically in stream : we ignore them */
2198     if (pkt.stream_index >= ifile->nb_streams)
2199         goto discard_packet;
2200
2201     ist = input_streams[ifile->ist_index + pkt.stream_index];
2202     if (ist->discard)
2203         goto discard_packet;
2204
2205     if (pkt.dts != AV_NOPTS_VALUE)
2206         pkt.dts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
2207     if (pkt.pts != AV_NOPTS_VALUE)
2208         pkt.pts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
2209
2210     if (pkt.pts != AV_NOPTS_VALUE)
2211         pkt.pts *= ist->ts_scale;
2212     if (pkt.dts != AV_NOPTS_VALUE)
2213         pkt.dts *= ist->ts_scale;
2214
2215     if (pkt.dts != AV_NOPTS_VALUE && ist->next_dts != AV_NOPTS_VALUE &&
2216         (is->iformat->flags & AVFMT_TS_DISCONT)) {
2217         int64_t pkt_dts = av_rescale_q(pkt.dts, ist->st->time_base, AV_TIME_BASE_Q);
2218         int64_t delta   = pkt_dts - ist->next_dts;
2219
2220         if ((FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE || pkt_dts + 1 < ist->last_dts) && !copy_ts) {
2221             ifile->ts_offset -= delta;
2222             av_log(NULL, AV_LOG_DEBUG,
2223                    "timestamp discontinuity %"PRId64", new offset= %"PRId64"\n",
2224                    delta, ifile->ts_offset);
2225             pkt.dts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
2226             if (pkt.pts != AV_NOPTS_VALUE)
2227                 pkt.pts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
2228         }
2229     }
2230
2231     ret = output_packet(ist, &pkt);
2232     if (ret < 0) {
2233         av_log(NULL, AV_LOG_ERROR, "Error while decoding stream #%d:%d\n",
2234                ist->file_index, ist->st->index);
2235         if (exit_on_error)
2236             exit_program(1);
2237     }
2238
2239 discard_packet:
2240     av_free_packet(&pkt);
2241
2242     return 0;
2243 }
2244
2245 /*
2246  * The following code is the main loop of the file converter
2247  */
2248 static int transcode(void)
2249 {
2250     int ret, i, need_input = 1;
2251     AVFormatContext *os;
2252     OutputStream *ost;
2253     InputStream *ist;
2254     int64_t timer_start;
2255
2256     ret = transcode_init();
2257     if (ret < 0)
2258         goto fail;
2259
2260     av_log(NULL, AV_LOG_INFO, "Press ctrl-c to stop encoding\n");
2261     term_init();
2262
2263     timer_start = av_gettime();
2264
2265 #if HAVE_PTHREADS
2266     if ((ret = init_input_threads()) < 0)
2267         goto fail;
2268 #endif
2269
2270     while (!received_sigterm) {
2271         /* check if there's any stream where output is still needed */
2272         if (!need_output()) {
2273             av_log(NULL, AV_LOG_VERBOSE, "No more output streams to write to, finishing.\n");
2274             break;
2275         }
2276
2277         /* read and process one input packet if needed */
2278         if (need_input) {
2279             ret = process_input();
2280             if (ret == AVERROR_EOF)
2281                 need_input = 0;
2282         }
2283
2284         ret = poll_filters();
2285         if (ret < 0) {
2286             if (ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
2287                 continue;
2288
2289             av_log(NULL, AV_LOG_ERROR, "Error while filtering.\n");
2290             break;
2291         }
2292
2293         /* dump report by using the output first video and audio streams */
2294         print_report(0, timer_start);
2295     }
2296 #if HAVE_PTHREADS
2297     free_input_threads();
2298 #endif
2299
2300     /* at the end of stream, we must flush the decoder buffers */
2301     for (i = 0; i < nb_input_streams; i++) {
2302         ist = input_streams[i];
2303         if (!input_files[ist->file_index]->eof_reached && ist->decoding_needed) {
2304             output_packet(ist, NULL);
2305         }
2306     }
2307     poll_filters();
2308     flush_encoders();
2309
2310     term_exit();
2311
2312     /* write the trailer if needed and close file */
2313     for (i = 0; i < nb_output_files; i++) {
2314         os = output_files[i]->ctx;
2315         av_write_trailer(os);
2316     }
2317
2318     /* dump report by using the first video and audio streams */
2319     print_report(1, timer_start);
2320
2321     /* close each encoder */
2322     for (i = 0; i < nb_output_streams; i++) {
2323         ost = output_streams[i];
2324         if (ost->encoding_needed) {
2325             av_freep(&ost->st->codec->stats_in);
2326             avcodec_close(ost->st->codec);
2327         }
2328     }
2329
2330     /* close each decoder */
2331     for (i = 0; i < nb_input_streams; i++) {
2332         ist = input_streams[i];
2333         if (ist->decoding_needed) {
2334             avcodec_close(ist->st->codec);
2335         }
2336     }
2337
2338     /* finished ! */
2339     ret = 0;
2340
2341  fail:
2342 #if HAVE_PTHREADS
2343     free_input_threads();
2344 #endif
2345
2346     if (output_streams) {
2347         for (i = 0; i < nb_output_streams; i++) {
2348             ost = output_streams[i];
2349             if (ost) {
2350                 if (ost->stream_copy)
2351                     av_freep(&ost->st->codec->extradata);
2352                 if (ost->logfile) {
2353                     fclose(ost->logfile);
2354                     ost->logfile = NULL;
2355                 }
2356                 av_freep(&ost->st->codec->subtitle_header);
2357                 av_free(ost->forced_kf_pts);
2358                 av_dict_free(&ost->opts);
2359             }
2360         }
2361     }
2362     return ret;
2363 }
2364
2365 static int64_t getutime(void)
2366 {
2367 #if HAVE_GETRUSAGE
2368     struct rusage rusage;
2369
2370     getrusage(RUSAGE_SELF, &rusage);
2371     return (rusage.ru_utime.tv_sec * 1000000LL) + rusage.ru_utime.tv_usec;
2372 #elif HAVE_GETPROCESSTIMES
2373     HANDLE proc;
2374     FILETIME c, e, k, u;
2375     proc = GetCurrentProcess();
2376     GetProcessTimes(proc, &c, &e, &k, &u);
2377     return ((int64_t) u.dwHighDateTime << 32 | u.dwLowDateTime) / 10;
2378 #else
2379     return av_gettime();
2380 #endif
2381 }
2382
2383 static int64_t getmaxrss(void)
2384 {
2385 #if HAVE_GETRUSAGE && HAVE_STRUCT_RUSAGE_RU_MAXRSS
2386     struct rusage rusage;
2387     getrusage(RUSAGE_SELF, &rusage);
2388     return (int64_t)rusage.ru_maxrss * 1024;
2389 #elif HAVE_GETPROCESSMEMORYINFO
2390     HANDLE proc;
2391     PROCESS_MEMORY_COUNTERS memcounters;
2392     proc = GetCurrentProcess();
2393     memcounters.cb = sizeof(memcounters);
2394     GetProcessMemoryInfo(proc, &memcounters, sizeof(memcounters));
2395     return memcounters.PeakPagefileUsage;
2396 #else
2397     return 0;
2398 #endif
2399 }
2400
2401 static void parse_cpuflags(int argc, char **argv, const OptionDef *options)
2402 {
2403     int idx = locate_option(argc, argv, options, "cpuflags");
2404     if (idx && argv[idx + 1])
2405         opt_cpuflags(NULL, "cpuflags", argv[idx + 1]);
2406 }
2407
2408 int main(int argc, char **argv)
2409 {
2410     OptionsContext o = { 0 };
2411     int64_t ti;
2412
2413     reset_options(&o);
2414
2415     av_log_set_flags(AV_LOG_SKIP_REPEATED);
2416     parse_loglevel(argc, argv, options);
2417
2418     avcodec_register_all();
2419 #if CONFIG_AVDEVICE
2420     avdevice_register_all();
2421 #endif
2422     avfilter_register_all();
2423     av_register_all();
2424     avformat_network_init();
2425
2426     show_banner();
2427
2428     parse_cpuflags(argc, argv, options);
2429
2430     /* parse options */
2431     parse_options(&o, argc, argv, options, opt_output_file);
2432
2433     if (nb_output_files <= 0 && nb_input_files == 0) {
2434         show_usage();
2435         av_log(NULL, AV_LOG_WARNING, "Use -h to get full help or, even better, run 'man %s'\n", program_name);
2436         exit_program(1);
2437     }
2438
2439     /* file converter / grab */
2440     if (nb_output_files <= 0) {
2441         fprintf(stderr, "At least one output file must be specified\n");
2442         exit_program(1);
2443     }
2444
2445     ti = getutime();
2446     if (transcode() < 0)
2447         exit_program(1);
2448     ti = getutime() - ti;
2449     if (do_benchmark) {
2450         int maxrss = getmaxrss() / 1024;
2451         printf("bench: utime=%0.3fs maxrss=%ikB\n", ti / 1000000.0, maxrss);
2452     }
2453
2454     exit_program(0);
2455     return 0;
2456 }