avformat, avcodec: log discard padding
[ffmpeg.git] / ffmpeg_filter.c
1 /*
2  * ffmpeg filter configuration
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 #include <stdint.h>
22
23 #include "ffmpeg.h"
24
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/buffersink.h"
27
28 #include "libavresample/avresample.h"
29
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/bprint.h"
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/pixdesc.h"
36 #include "libavutil/pixfmt.h"
37 #include "libavutil/imgutils.h"
38 #include "libavutil/samplefmt.h"
39
40 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
41 {
42     if (codec && codec->pix_fmts) {
43         const enum AVPixelFormat *p = codec->pix_fmts;
44         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
45         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
46         enum AVPixelFormat best= AV_PIX_FMT_NONE;
47         static const enum AVPixelFormat mjpeg_formats[] =
48             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
49         static const enum AVPixelFormat ljpeg_formats[] =
50             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
51               AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
52
53         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
54             if (enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
55                 p = mjpeg_formats;
56             } else if (enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
57                 p =ljpeg_formats;
58             }
59         }
60         for (; *p != AV_PIX_FMT_NONE; p++) {
61             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
62             if (*p == target)
63                 break;
64         }
65         if (*p == AV_PIX_FMT_NONE) {
66             if (target != AV_PIX_FMT_NONE)
67                 av_log(NULL, AV_LOG_WARNING,
68                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
69                        av_get_pix_fmt_name(target),
70                        codec->name,
71                        av_get_pix_fmt_name(best));
72             return best;
73         }
74     }
75     return target;
76 }
77
78 void choose_sample_fmt(AVStream *st, AVCodec *codec)
79 {
80     if (codec && codec->sample_fmts) {
81         const enum AVSampleFormat *p = codec->sample_fmts;
82         for (; *p != -1; p++) {
83             if (*p == st->codec->sample_fmt)
84                 break;
85         }
86         if (*p == -1) {
87             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
88                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
89             if(av_get_sample_fmt_name(st->codec->sample_fmt))
90             av_log(NULL, AV_LOG_WARNING,
91                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
92                    av_get_sample_fmt_name(st->codec->sample_fmt),
93                    codec->name,
94                    av_get_sample_fmt_name(codec->sample_fmts[0]));
95             st->codec->sample_fmt = codec->sample_fmts[0];
96         }
97     }
98 }
99
100 static char *choose_pix_fmts(OutputStream *ost)
101 {
102     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
103     if (strict_dict)
104         // used by choose_pixel_fmt() and below
105         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
106
107      if (ost->keep_pix_fmt) {
108         if (ost->filter)
109             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
110                                             AVFILTER_AUTO_CONVERT_NONE);
111         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
112             return NULL;
113         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
114     }
115     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
116         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
117     } else if (ost->enc && ost->enc->pix_fmts) {
118         const enum AVPixelFormat *p;
119         AVIOContext *s = NULL;
120         uint8_t *ret;
121         int len;
122
123         if (avio_open_dyn_buf(&s) < 0)
124             exit_program(1);
125
126         p = ost->enc->pix_fmts;
127         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
128             if (ost->enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
129                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
130             } else if (ost->enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
131                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
132                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
133             }
134         }
135
136         for (; *p != AV_PIX_FMT_NONE; p++) {
137             const char *name = av_get_pix_fmt_name(*p);
138             avio_printf(s, "%s|", name);
139         }
140         len = avio_close_dyn_buf(s, &ret);
141         ret[len - 1] = 0;
142         return ret;
143     } else
144         return NULL;
145 }
146
147 /* Define a function for building a string containing a list of
148  * allowed formats. */
149 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
150 static char *choose_ ## var ## s(OutputStream *ost)                            \
151 {                                                                              \
152     if (ost->enc_ctx->var != none) {                                           \
153         get_name(ost->enc_ctx->var);                                           \
154         return av_strdup(name);                                                \
155     } else if (ost->enc && ost->enc->supported_list) {                         \
156         const type *p;                                                         \
157         AVIOContext *s = NULL;                                                 \
158         uint8_t *ret;                                                          \
159         int len;                                                               \
160                                                                                \
161         if (avio_open_dyn_buf(&s) < 0)                                         \
162             exit_program(1);                                                           \
163                                                                                \
164         for (p = ost->enc->supported_list; *p != none; p++) {                  \
165             get_name(*p);                                                      \
166             avio_printf(s, "%s|", name);                                       \
167         }                                                                      \
168         len = avio_close_dyn_buf(s, &ret);                                     \
169         ret[len - 1] = 0;                                                      \
170         return ret;                                                            \
171     } else                                                                     \
172         return NULL;                                                           \
173 }
174
175 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
176 //                   GET_PIX_FMT_NAME)
177
178 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
179                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
180
181 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
182                   GET_SAMPLE_RATE_NAME)
183
184 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
185                   GET_CH_LAYOUT_NAME)
186
187 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
188 {
189     FilterGraph *fg = av_mallocz(sizeof(*fg));
190
191     if (!fg)
192         exit_program(1);
193     fg->index = nb_filtergraphs;
194
195     GROW_ARRAY(fg->outputs, fg->nb_outputs);
196     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
197         exit_program(1);
198     fg->outputs[0]->ost   = ost;
199     fg->outputs[0]->graph = fg;
200
201     ost->filter = fg->outputs[0];
202
203     GROW_ARRAY(fg->inputs, fg->nb_inputs);
204     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
205         exit_program(1);
206     fg->inputs[0]->ist   = ist;
207     fg->inputs[0]->graph = fg;
208
209     GROW_ARRAY(ist->filters, ist->nb_filters);
210     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
211
212     GROW_ARRAY(filtergraphs, nb_filtergraphs);
213     filtergraphs[nb_filtergraphs - 1] = fg;
214
215     return fg;
216 }
217
218 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
219 {
220     InputStream *ist = NULL;
221     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
222     int i;
223
224     // TODO: support other filter types
225     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
226         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
227                "currently.\n");
228         exit_program(1);
229     }
230
231     if (in->name) {
232         AVFormatContext *s;
233         AVStream       *st = NULL;
234         char *p;
235         int file_idx = strtol(in->name, &p, 0);
236
237         if (file_idx < 0 || file_idx >= nb_input_files) {
238             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
239                    file_idx, fg->graph_desc);
240             exit_program(1);
241         }
242         s = input_files[file_idx]->ctx;
243
244         for (i = 0; i < s->nb_streams; i++) {
245             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
246             if (stream_type != type &&
247                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
248                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
249                 continue;
250             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
251                 st = s->streams[i];
252                 break;
253             }
254         }
255         if (!st) {
256             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
257                    "matches no streams.\n", p, fg->graph_desc);
258             exit_program(1);
259         }
260         ist = input_streams[input_files[file_idx]->ist_index + st->index];
261     } else {
262         /* find the first unused stream of corresponding type */
263         for (i = 0; i < nb_input_streams; i++) {
264             ist = input_streams[i];
265             if (ist->dec_ctx->codec_type == type && ist->discard)
266                 break;
267         }
268         if (i == nb_input_streams) {
269             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
270                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
271                    in->filter_ctx->name);
272             exit_program(1);
273         }
274     }
275     av_assert0(ist);
276
277     ist->discard         = 0;
278     ist->decoding_needed |= DECODING_FOR_FILTER;
279     ist->st->discard = AVDISCARD_NONE;
280
281     GROW_ARRAY(fg->inputs, fg->nb_inputs);
282     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
283         exit_program(1);
284     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
285     fg->inputs[fg->nb_inputs - 1]->graph = fg;
286
287     GROW_ARRAY(ist->filters, ist->nb_filters);
288     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
289 }
290
291 static int insert_trim(int64_t start_time, int64_t duration,
292                        AVFilterContext **last_filter, int *pad_idx,
293                        const char *filter_name)
294 {
295     AVFilterGraph *graph = (*last_filter)->graph;
296     AVFilterContext *ctx;
297     const AVFilter *trim;
298     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
299     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
300     int ret = 0;
301
302     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
303         return 0;
304
305     trim = avfilter_get_by_name(name);
306     if (!trim) {
307         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
308                "recording time.\n", name);
309         return AVERROR_FILTER_NOT_FOUND;
310     }
311
312     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
313     if (!ctx)
314         return AVERROR(ENOMEM);
315
316     if (duration != INT64_MAX) {
317         ret = av_opt_set_int(ctx, "durationi", duration,
318                                 AV_OPT_SEARCH_CHILDREN);
319     }
320     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
321         ret = av_opt_set_int(ctx, "starti", start_time,
322                                 AV_OPT_SEARCH_CHILDREN);
323     }
324     if (ret < 0) {
325         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
326         return ret;
327     }
328
329     ret = avfilter_init_str(ctx, NULL);
330     if (ret < 0)
331         return ret;
332
333     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
334     if (ret < 0)
335         return ret;
336
337     *last_filter = ctx;
338     *pad_idx     = 0;
339     return 0;
340 }
341
342 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
343 {
344     char *pix_fmts;
345     OutputStream *ost = ofilter->ost;
346     OutputFile    *of = output_files[ost->file_index];
347     AVCodecContext *codec = ost->enc_ctx;
348     AVFilterContext *last_filter = out->filter_ctx;
349     int pad_idx = out->pad_idx;
350     int ret;
351     char name[255];
352
353     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
354     ret = avfilter_graph_create_filter(&ofilter->filter,
355                                        avfilter_get_by_name("buffersink"),
356                                        name, NULL, NULL, fg->graph);
357
358     if (ret < 0)
359         return ret;
360
361     if (codec->width || codec->height) {
362         char args[255];
363         AVFilterContext *filter;
364
365         snprintf(args, sizeof(args), "%d:%d:0x%X",
366                  codec->width,
367                  codec->height,
368                  (unsigned)ost->sws_flags);
369         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
370                  ost->file_index, ost->index);
371         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
372                                                 name, args, NULL, fg->graph)) < 0)
373             return ret;
374         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
375             return ret;
376
377         last_filter = filter;
378         pad_idx = 0;
379     }
380
381     if ((pix_fmts = choose_pix_fmts(ost))) {
382         AVFilterContext *filter;
383         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
384                  ost->file_index, ost->index);
385         ret = avfilter_graph_create_filter(&filter,
386                                            avfilter_get_by_name("format"),
387                                            "format", pix_fmts, NULL, fg->graph);
388         av_freep(&pix_fmts);
389         if (ret < 0)
390             return ret;
391         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
392             return ret;
393
394         last_filter = filter;
395         pad_idx     = 0;
396     }
397
398     if (ost->frame_rate.num && 0) {
399         AVFilterContext *fps;
400         char args[255];
401
402         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
403                  ost->frame_rate.den);
404         snprintf(name, sizeof(name), "fps for output stream %d:%d",
405                  ost->file_index, ost->index);
406         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
407                                            name, args, NULL, fg->graph);
408         if (ret < 0)
409             return ret;
410
411         ret = avfilter_link(last_filter, pad_idx, fps, 0);
412         if (ret < 0)
413             return ret;
414         last_filter = fps;
415         pad_idx = 0;
416     }
417
418     snprintf(name, sizeof(name), "trim for output stream %d:%d",
419              ost->file_index, ost->index);
420     ret = insert_trim(of->start_time, of->recording_time,
421                       &last_filter, &pad_idx, name);
422     if (ret < 0)
423         return ret;
424
425
426     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
427         return ret;
428
429     return 0;
430 }
431
432 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
433 {
434     OutputStream *ost = ofilter->ost;
435     OutputFile    *of = output_files[ost->file_index];
436     AVCodecContext *codec  = ost->enc_ctx;
437     AVFilterContext *last_filter = out->filter_ctx;
438     int pad_idx = out->pad_idx;
439     char *sample_fmts, *sample_rates, *channel_layouts;
440     char name[255];
441     int ret;
442
443     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
444     ret = avfilter_graph_create_filter(&ofilter->filter,
445                                        avfilter_get_by_name("abuffersink"),
446                                        name, NULL, NULL, fg->graph);
447     if (ret < 0)
448         return ret;
449     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
450         return ret;
451
452 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
453     AVFilterContext *filt_ctx;                                              \
454                                                                             \
455     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
456            "similarly to -af " filter_name "=%s.\n", arg);                  \
457                                                                             \
458     ret = avfilter_graph_create_filter(&filt_ctx,                           \
459                                        avfilter_get_by_name(filter_name),   \
460                                        filter_name, arg, NULL, fg->graph);  \
461     if (ret < 0)                                                            \
462         return ret;                                                         \
463                                                                             \
464     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
465     if (ret < 0)                                                            \
466         return ret;                                                         \
467                                                                             \
468     last_filter = filt_ctx;                                                 \
469     pad_idx = 0;                                                            \
470 } while (0)
471     if (ost->audio_channels_mapped) {
472         int i;
473         AVBPrint pan_buf;
474         av_bprint_init(&pan_buf, 256, 8192);
475         av_bprintf(&pan_buf, "0x%"PRIx64,
476                    av_get_default_channel_layout(ost->audio_channels_mapped));
477         for (i = 0; i < ost->audio_channels_mapped; i++)
478             if (ost->audio_channels_map[i] != -1)
479                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
480
481         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
482         av_bprint_finalize(&pan_buf, NULL);
483     }
484
485     if (codec->channels && !codec->channel_layout)
486         codec->channel_layout = av_get_default_channel_layout(codec->channels);
487
488     sample_fmts     = choose_sample_fmts(ost);
489     sample_rates    = choose_sample_rates(ost);
490     channel_layouts = choose_channel_layouts(ost);
491     if (sample_fmts || sample_rates || channel_layouts) {
492         AVFilterContext *format;
493         char args[256];
494         args[0] = 0;
495
496         if (sample_fmts)
497             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
498                             sample_fmts);
499         if (sample_rates)
500             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
501                             sample_rates);
502         if (channel_layouts)
503             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
504                             channel_layouts);
505
506         av_freep(&sample_fmts);
507         av_freep(&sample_rates);
508         av_freep(&channel_layouts);
509
510         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
511                  ost->file_index, ost->index);
512         ret = avfilter_graph_create_filter(&format,
513                                            avfilter_get_by_name("aformat"),
514                                            name, args, NULL, fg->graph);
515         if (ret < 0)
516             return ret;
517
518         ret = avfilter_link(last_filter, pad_idx, format, 0);
519         if (ret < 0)
520             return ret;
521
522         last_filter = format;
523         pad_idx = 0;
524     }
525
526     if (audio_volume != 256 && 0) {
527         char args[256];
528
529         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
530         AUTO_INSERT_FILTER("-vol", "volume", args);
531     }
532
533     if (ost->apad && of->shortest) {
534         char args[256];
535         int i;
536
537         for (i=0; i<of->ctx->nb_streams; i++)
538             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
539                 break;
540
541         if (i<of->ctx->nb_streams) {
542             snprintf(args, sizeof(args), "%s", ost->apad);
543             AUTO_INSERT_FILTER("-apad", "apad", args);
544         }
545     }
546
547     snprintf(name, sizeof(name), "trim for output stream %d:%d",
548              ost->file_index, ost->index);
549     ret = insert_trim(of->start_time, of->recording_time,
550                       &last_filter, &pad_idx, name);
551     if (ret < 0)
552         return ret;
553
554     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
555         return ret;
556
557     return 0;
558 }
559
560 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
561 {                                                                  \
562     AVFilterContext *ctx = inout->filter_ctx;                      \
563     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
564     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
565     AVIOContext *pb;                                               \
566                                                                    \
567     if (avio_open_dyn_buf(&pb) < 0)                                \
568         exit_program(1);                                           \
569                                                                    \
570     avio_printf(pb, "%s", ctx->filter->name);                      \
571     if (nb_pads > 1)                                               \
572         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
573     avio_w8(pb, 0);                                                \
574     avio_close_dyn_buf(pb, &f->name);                              \
575 }
576
577 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
578 {
579     av_freep(&ofilter->name);
580     DESCRIBE_FILTER_LINK(ofilter, out, 0);
581
582     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
583     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
584     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
585     default: av_assert0(0);
586     }
587 }
588
589 static int sub2video_prepare(InputStream *ist)
590 {
591     AVFormatContext *avf = input_files[ist->file_index]->ctx;
592     int i, w, h;
593
594     /* Compute the size of the canvas for the subtitles stream.
595        If the subtitles codec has set a size, use it. Otherwise use the
596        maximum dimensions of the video streams in the same file. */
597     w = ist->dec_ctx->width;
598     h = ist->dec_ctx->height;
599     if (!(w && h)) {
600         for (i = 0; i < avf->nb_streams; i++) {
601             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
602                 w = FFMAX(w, avf->streams[i]->codec->width);
603                 h = FFMAX(h, avf->streams[i]->codec->height);
604             }
605         }
606         if (!(w && h)) {
607             w = FFMAX(w, 720);
608             h = FFMAX(h, 576);
609         }
610         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
611     }
612     ist->sub2video.w = ist->dec_ctx->width  = ist->resample_width  = w;
613     ist->sub2video.h = ist->dec_ctx->height = ist->resample_height = h;
614
615     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
616        palettes for all rectangles are identical or compatible */
617     ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
618
619     ist->sub2video.frame = av_frame_alloc();
620     if (!ist->sub2video.frame)
621         return AVERROR(ENOMEM);
622     ist->sub2video.last_pts = INT64_MIN;
623     return 0;
624 }
625
626 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
627                                         AVFilterInOut *in)
628 {
629     AVFilterContext *last_filter;
630     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
631     InputStream *ist = ifilter->ist;
632     InputFile     *f = input_files[ist->file_index];
633     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
634                                          ist->st->time_base;
635     AVRational fr = ist->framerate;
636     AVRational sar;
637     AVBPrint args;
638     char name[255];
639     int ret, pad_idx = 0;
640     int64_t tsoffset = 0;
641
642     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
643         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
644         return AVERROR(EINVAL);
645     }
646
647     if (!fr.num)
648         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
649
650     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
651         ret = sub2video_prepare(ist);
652         if (ret < 0)
653             return ret;
654     }
655
656     sar = ist->st->sample_aspect_ratio.num ?
657           ist->st->sample_aspect_ratio :
658           ist->dec_ctx->sample_aspect_ratio;
659     if(!sar.den)
660         sar = (AVRational){0,1};
661     av_bprint_init(&args, 0, 1);
662     av_bprintf(&args,
663              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
664              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
665              ist->resample_height,
666              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
667              tb.num, tb.den, sar.num, sar.den,
668              SWS_BILINEAR + ((ist->dec_ctx->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
669     if (fr.num && fr.den)
670         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
671     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
672              ist->file_index, ist->st->index);
673
674     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
675                                             args.str, NULL, fg->graph)) < 0)
676         return ret;
677     last_filter = ifilter->filter;
678
679     if (ist->framerate.num) {
680         AVFilterContext *setpts;
681
682         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
683                  ist->file_index, ist->st->index);
684         if ((ret = avfilter_graph_create_filter(&setpts,
685                                                 avfilter_get_by_name("setpts"),
686                                                 name, "N", NULL,
687                                                 fg->graph)) < 0)
688             return ret;
689
690         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
691             return ret;
692
693         last_filter = setpts;
694     }
695
696     if (do_deinterlace) {
697         AVFilterContext *yadif;
698
699         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
700                  ist->file_index, ist->st->index);
701         if ((ret = avfilter_graph_create_filter(&yadif,
702                                                 avfilter_get_by_name("yadif"),
703                                                 name, "", NULL,
704                                                 fg->graph)) < 0)
705             return ret;
706
707         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
708             return ret;
709
710         last_filter = yadif;
711     }
712
713     snprintf(name, sizeof(name), "trim for input stream %d:%d",
714              ist->file_index, ist->st->index);
715     if (copy_ts) {
716         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
717         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
718             tsoffset += f->ctx->start_time;
719     }
720     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
721                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
722                       &last_filter, &pad_idx, name);
723     if (ret < 0)
724         return ret;
725
726     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
727         return ret;
728     return 0;
729 }
730
731 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
732                                         AVFilterInOut *in)
733 {
734     AVFilterContext *last_filter;
735     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
736     InputStream *ist = ifilter->ist;
737     InputFile     *f = input_files[ist->file_index];
738     AVBPrint args;
739     char name[255];
740     int ret, pad_idx = 0;
741     int64_t tsoffset = 0;
742
743     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
744         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
745         return AVERROR(EINVAL);
746     }
747
748     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
749     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
750              1, ist->dec_ctx->sample_rate,
751              ist->dec_ctx->sample_rate,
752              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
753     if (ist->dec_ctx->channel_layout)
754         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
755                    ist->dec_ctx->channel_layout);
756     else
757         av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
758     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
759              ist->file_index, ist->st->index);
760
761     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
762                                             name, args.str, NULL,
763                                             fg->graph)) < 0)
764         return ret;
765     last_filter = ifilter->filter;
766
767 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
768     AVFilterContext *filt_ctx;                                              \
769                                                                             \
770     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
771            "similarly to -af " filter_name "=%s.\n", arg);                  \
772                                                                             \
773     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
774                 fg->index, filter_name, ist->file_index, ist->st->index);   \
775     ret = avfilter_graph_create_filter(&filt_ctx,                           \
776                                        avfilter_get_by_name(filter_name),   \
777                                        name, arg, NULL, fg->graph);         \
778     if (ret < 0)                                                            \
779         return ret;                                                         \
780                                                                             \
781     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
782     if (ret < 0)                                                            \
783         return ret;                                                         \
784                                                                             \
785     last_filter = filt_ctx;                                                 \
786 } while (0)
787
788     if (audio_sync_method > 0) {
789         char args[256] = {0};
790
791         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
792         if (audio_drift_threshold != 0.1)
793             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
794         if (!fg->reconfiguration)
795             av_strlcatf(args, sizeof(args), ":first_pts=0");
796         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
797     }
798
799 //     if (ost->audio_channels_mapped) {
800 //         int i;
801 //         AVBPrint pan_buf;
802 //         av_bprint_init(&pan_buf, 256, 8192);
803 //         av_bprintf(&pan_buf, "0x%"PRIx64,
804 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
805 //         for (i = 0; i < ost->audio_channels_mapped; i++)
806 //             if (ost->audio_channels_map[i] != -1)
807 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
808 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
809 //         av_bprint_finalize(&pan_buf, NULL);
810 //     }
811
812     if (audio_volume != 256) {
813         char args[256];
814
815         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
816                "audio filter instead.\n");
817
818         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
819         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
820     }
821
822     snprintf(name, sizeof(name), "trim for input stream %d:%d",
823              ist->file_index, ist->st->index);
824     if (copy_ts) {
825         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
826         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
827             tsoffset += f->ctx->start_time;
828     }
829     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
830                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
831                       &last_filter, &pad_idx, name);
832     if (ret < 0)
833         return ret;
834
835     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
836         return ret;
837
838     return 0;
839 }
840
841 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
842                                   AVFilterInOut *in)
843 {
844     av_freep(&ifilter->name);
845     DESCRIBE_FILTER_LINK(ifilter, in, 1);
846
847     if (!ifilter->ist->dec) {
848         av_log(NULL, AV_LOG_ERROR,
849                "No decoder for stream #%d:%d, filtering impossible\n",
850                ifilter->ist->file_index, ifilter->ist->st->index);
851         return AVERROR_DECODER_NOT_FOUND;
852     }
853     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
854     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
855     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
856     default: av_assert0(0);
857     }
858 }
859
860 int configure_filtergraph(FilterGraph *fg)
861 {
862     AVFilterInOut *inputs, *outputs, *cur;
863     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
864     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
865                                       fg->graph_desc;
866
867     avfilter_graph_free(&fg->graph);
868     if (!(fg->graph = avfilter_graph_alloc()))
869         return AVERROR(ENOMEM);
870
871     if (simple) {
872         OutputStream *ost = fg->outputs[0]->ost;
873         char args[512];
874         AVDictionaryEntry *e = NULL;
875
876         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
877         fg->graph->scale_sws_opts = av_strdup(args);
878
879         args[0] = 0;
880         while ((e = av_dict_get(ost->swr_opts, "", e,
881                                 AV_DICT_IGNORE_SUFFIX))) {
882             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
883         }
884         if (strlen(args))
885             args[strlen(args)-1] = 0;
886         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
887
888         args[0] = '\0';
889         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
890                                 AV_DICT_IGNORE_SUFFIX))) {
891             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
892         }
893         if (strlen(args))
894             args[strlen(args) - 1] = '\0';
895         fg->graph->resample_lavr_opts = av_strdup(args);
896
897         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
898         if (e)
899             av_opt_set(fg->graph, "threads", e->value, 0);
900     }
901
902     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
903         return ret;
904
905     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
906         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
907                "exactly one input and output.\n", graph_desc);
908         return AVERROR(EINVAL);
909     }
910
911     for (cur = inputs; !simple && init && cur; cur = cur->next)
912         init_input_filter(fg, cur);
913
914     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
915         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
916             avfilter_inout_free(&inputs);
917             avfilter_inout_free(&outputs);
918             return ret;
919         }
920     avfilter_inout_free(&inputs);
921
922     if (!init || simple) {
923         /* we already know the mappings between lavfi outputs and output streams,
924          * so we can finish the setup */
925         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
926             configure_output_filter(fg, fg->outputs[i], cur);
927         avfilter_inout_free(&outputs);
928
929         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
930             return ret;
931     } else {
932         /* wait until output mappings are processed */
933         for (cur = outputs; cur;) {
934             GROW_ARRAY(fg->outputs, fg->nb_outputs);
935             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
936                 exit_program(1);
937             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
938             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
939             cur = cur->next;
940             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
941         }
942     }
943
944     fg->reconfiguration = 1;
945
946     for (i = 0; i < fg->nb_outputs; i++) {
947         OutputStream *ost = fg->outputs[i]->ost;
948         if (ost &&
949             ost->enc->type == AVMEDIA_TYPE_AUDIO &&
950             !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
951             av_buffersink_set_frame_size(ost->filter->filter,
952                                          ost->enc_ctx->frame_size);
953     }
954
955     return 0;
956 }
957
958 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
959 {
960     int i;
961     for (i = 0; i < fg->nb_inputs; i++)
962         if (fg->inputs[i]->ist == ist)
963             return 1;
964     return 0;
965 }
966