ffmpeg: init filtergraphs only after we have a frame on each input
[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 #include "libavfilter/buffersrc.h"
28
29 #include "libavresample/avresample.h"
30
31 #include "libavutil/avassert.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/bprint.h"
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/display.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/pixdesc.h"
38 #include "libavutil/pixfmt.h"
39 #include "libavutil/imgutils.h"
40 #include "libavutil/samplefmt.h"
41
42 static const enum AVPixelFormat *get_compliance_unofficial_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
43 {
44     static const enum AVPixelFormat mjpeg_formats[] =
45         { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
46           AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
47           AV_PIX_FMT_NONE };
48     static const enum AVPixelFormat ljpeg_formats[] =
49         { AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
50           AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
51           AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
52           AV_PIX_FMT_NONE};
53
54     if (codec_id == AV_CODEC_ID_MJPEG) {
55         return mjpeg_formats;
56     } else if (codec_id == AV_CODEC_ID_LJPEG) {
57         return ljpeg_formats;
58     } else {
59         return default_formats;
60     }
61 }
62
63 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
64 {
65     if (codec && codec->pix_fmts) {
66         const enum AVPixelFormat *p = codec->pix_fmts;
67         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
68         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
69         enum AVPixelFormat best= AV_PIX_FMT_NONE;
70
71         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
72             p = get_compliance_unofficial_pix_fmts(enc_ctx->codec_id, p);
73         }
74         for (; *p != AV_PIX_FMT_NONE; p++) {
75             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
76             if (*p == target)
77                 break;
78         }
79         if (*p == AV_PIX_FMT_NONE) {
80             if (target != AV_PIX_FMT_NONE)
81                 av_log(NULL, AV_LOG_WARNING,
82                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
83                        av_get_pix_fmt_name(target),
84                        codec->name,
85                        av_get_pix_fmt_name(best));
86             return best;
87         }
88     }
89     return target;
90 }
91
92 void choose_sample_fmt(AVStream *st, AVCodec *codec)
93 {
94     if (codec && codec->sample_fmts) {
95         const enum AVSampleFormat *p = codec->sample_fmts;
96         for (; *p != -1; p++) {
97             if (*p == st->codecpar->format)
98                 break;
99         }
100         if (*p == -1) {
101             if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codecpar->format) > av_get_sample_fmt_name(codec->sample_fmts[0]))
102                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
103             if(av_get_sample_fmt_name(st->codecpar->format))
104             av_log(NULL, AV_LOG_WARNING,
105                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
106                    av_get_sample_fmt_name(st->codecpar->format),
107                    codec->name,
108                    av_get_sample_fmt_name(codec->sample_fmts[0]));
109             st->codecpar->format = codec->sample_fmts[0];
110         }
111     }
112 }
113
114 static char *choose_pix_fmts(OutputFilter *ofilter)
115 {
116     OutputStream *ost = ofilter->ost;
117     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
118     if (strict_dict)
119         // used by choose_pixel_fmt() and below
120         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
121
122      if (ost->keep_pix_fmt) {
123         avfilter_graph_set_auto_convert(ofilter->graph->graph,
124                                             AVFILTER_AUTO_CONVERT_NONE);
125         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
126             return NULL;
127         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
128     }
129     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
130         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
131     } else if (ost->enc && ost->enc->pix_fmts) {
132         const enum AVPixelFormat *p;
133         AVIOContext *s = NULL;
134         uint8_t *ret;
135         int len;
136
137         if (avio_open_dyn_buf(&s) < 0)
138             exit_program(1);
139
140         p = ost->enc->pix_fmts;
141         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
142             p = get_compliance_unofficial_pix_fmts(ost->enc_ctx->codec_id, p);
143         }
144
145         for (; *p != AV_PIX_FMT_NONE; p++) {
146             const char *name = av_get_pix_fmt_name(*p);
147             avio_printf(s, "%s|", name);
148         }
149         len = avio_close_dyn_buf(s, &ret);
150         ret[len - 1] = 0;
151         return ret;
152     } else
153         return NULL;
154 }
155
156 /* Define a function for building a string containing a list of
157  * allowed formats. */
158 #define DEF_CHOOSE_FORMAT(suffix, type, var, supported_list, none, get_name)   \
159 static char *choose_ ## suffix (OutputFilter *ofilter)                         \
160 {                                                                              \
161     if (ofilter->var != none) {                                                \
162         get_name(ofilter->var);                                                \
163         return av_strdup(name);                                                \
164     } else if (ofilter->supported_list) {                                      \
165         const type *p;                                                         \
166         AVIOContext *s = NULL;                                                 \
167         uint8_t *ret;                                                          \
168         int len;                                                               \
169                                                                                \
170         if (avio_open_dyn_buf(&s) < 0)                                         \
171             exit_program(1);                                                           \
172                                                                                \
173         for (p = ofilter->supported_list; *p != none; p++) {                   \
174             get_name(*p);                                                      \
175             avio_printf(s, "%s|", name);                                       \
176         }                                                                      \
177         len = avio_close_dyn_buf(s, &ret);                                     \
178         ret[len - 1] = 0;                                                      \
179         return ret;                                                            \
180     } else                                                                     \
181         return NULL;                                                           \
182 }
183
184 //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
185 //                  GET_PIX_FMT_NAME)
186
187 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
188                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
189
190 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
191                   GET_SAMPLE_RATE_NAME)
192
193 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
194                   GET_CH_LAYOUT_NAME)
195
196 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
197 {
198     FilterGraph *fg = av_mallocz(sizeof(*fg));
199
200     if (!fg)
201         exit_program(1);
202     fg->index = nb_filtergraphs;
203
204     GROW_ARRAY(fg->outputs, fg->nb_outputs);
205     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
206         exit_program(1);
207     fg->outputs[0]->ost   = ost;
208     fg->outputs[0]->graph = fg;
209     fg->outputs[0]->format = -1;
210
211     ost->filter = fg->outputs[0];
212
213     GROW_ARRAY(fg->inputs, fg->nb_inputs);
214     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
215         exit_program(1);
216     fg->inputs[0]->ist   = ist;
217     fg->inputs[0]->graph = fg;
218     fg->inputs[0]->format = -1;
219
220     fg->inputs[0]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
221     if (!fg->inputs[0]->frame_queue)
222         exit_program(1);
223
224     GROW_ARRAY(ist->filters, ist->nb_filters);
225     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
226
227     GROW_ARRAY(filtergraphs, nb_filtergraphs);
228     filtergraphs[nb_filtergraphs - 1] = fg;
229
230     return 0;
231 }
232
233 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
234 {
235     InputStream *ist = NULL;
236     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
237     int i;
238
239     // TODO: support other filter types
240     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
241         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
242                "currently.\n");
243         exit_program(1);
244     }
245
246     if (in->name) {
247         AVFormatContext *s;
248         AVStream       *st = NULL;
249         char *p;
250         int file_idx = strtol(in->name, &p, 0);
251
252         if (file_idx < 0 || file_idx >= nb_input_files) {
253             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
254                    file_idx, fg->graph_desc);
255             exit_program(1);
256         }
257         s = input_files[file_idx]->ctx;
258
259         for (i = 0; i < s->nb_streams; i++) {
260             enum AVMediaType stream_type = s->streams[i]->codecpar->codec_type;
261             if (stream_type != type &&
262                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
263                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
264                 continue;
265             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
266                 st = s->streams[i];
267                 break;
268             }
269         }
270         if (!st) {
271             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
272                    "matches no streams.\n", p, fg->graph_desc);
273             exit_program(1);
274         }
275         ist = input_streams[input_files[file_idx]->ist_index + st->index];
276     } else {
277         /* find the first unused stream of corresponding type */
278         for (i = 0; i < nb_input_streams; i++) {
279             ist = input_streams[i];
280             if (ist->dec_ctx->codec_type == type && ist->discard)
281                 break;
282         }
283         if (i == nb_input_streams) {
284             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
285                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
286                    in->filter_ctx->name);
287             exit_program(1);
288         }
289     }
290     av_assert0(ist);
291
292     ist->discard         = 0;
293     ist->decoding_needed |= DECODING_FOR_FILTER;
294     ist->st->discard = AVDISCARD_NONE;
295
296     GROW_ARRAY(fg->inputs, fg->nb_inputs);
297     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
298         exit_program(1);
299     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
300     fg->inputs[fg->nb_inputs - 1]->graph = fg;
301     fg->inputs[fg->nb_inputs - 1]->format = -1;
302     fg->inputs[fg->nb_inputs - 1]->type = ist->st->codecpar->codec_type;
303
304     fg->inputs[fg->nb_inputs - 1]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
305     if (!fg->inputs[fg->nb_inputs - 1]->frame_queue)
306         exit_program(1);
307
308     GROW_ARRAY(ist->filters, ist->nb_filters);
309     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
310 }
311
312 int init_complex_filtergraph(FilterGraph *fg)
313 {
314     AVFilterInOut *inputs, *outputs, *cur;
315     AVFilterGraph *graph;
316     int ret = 0;
317
318     /* this graph is only used for determining the kinds of inputs
319      * and outputs we have, and is discarded on exit from this function */
320     graph = avfilter_graph_alloc();
321     if (!graph)
322         return AVERROR(ENOMEM);
323
324     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
325     if (ret < 0)
326         goto fail;
327
328     for (cur = inputs; cur; cur = cur->next)
329         init_input_filter(fg, cur);
330
331     for (cur = outputs; cur;) {
332         GROW_ARRAY(fg->outputs, fg->nb_outputs);
333         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
334         if (!fg->outputs[fg->nb_outputs - 1])
335             exit_program(1);
336
337         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
338         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
339         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
340                                                                          cur->pad_idx);
341         cur = cur->next;
342         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
343     }
344
345 fail:
346     avfilter_inout_free(&inputs);
347     avfilter_graph_free(&graph);
348     return ret;
349 }
350
351 static int insert_trim(int64_t start_time, int64_t duration,
352                        AVFilterContext **last_filter, int *pad_idx,
353                        const char *filter_name)
354 {
355     AVFilterGraph *graph = (*last_filter)->graph;
356     AVFilterContext *ctx;
357     const AVFilter *trim;
358     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
359     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
360     int ret = 0;
361
362     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
363         return 0;
364
365     trim = avfilter_get_by_name(name);
366     if (!trim) {
367         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
368                "recording time.\n", name);
369         return AVERROR_FILTER_NOT_FOUND;
370     }
371
372     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
373     if (!ctx)
374         return AVERROR(ENOMEM);
375
376     if (duration != INT64_MAX) {
377         ret = av_opt_set_int(ctx, "durationi", duration,
378                                 AV_OPT_SEARCH_CHILDREN);
379     }
380     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
381         ret = av_opt_set_int(ctx, "starti", start_time,
382                                 AV_OPT_SEARCH_CHILDREN);
383     }
384     if (ret < 0) {
385         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
386         return ret;
387     }
388
389     ret = avfilter_init_str(ctx, NULL);
390     if (ret < 0)
391         return ret;
392
393     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
394     if (ret < 0)
395         return ret;
396
397     *last_filter = ctx;
398     *pad_idx     = 0;
399     return 0;
400 }
401
402 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
403                          const char *filter_name, const char *args)
404 {
405     AVFilterGraph *graph = (*last_filter)->graph;
406     AVFilterContext *ctx;
407     int ret;
408
409     ret = avfilter_graph_create_filter(&ctx,
410                                        avfilter_get_by_name(filter_name),
411                                        filter_name, args, NULL, graph);
412     if (ret < 0)
413         return ret;
414
415     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
416     if (ret < 0)
417         return ret;
418
419     *last_filter = ctx;
420     *pad_idx     = 0;
421     return 0;
422 }
423
424 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
425 {
426     char *pix_fmts;
427     OutputStream *ost = ofilter->ost;
428     OutputFile    *of = output_files[ost->file_index];
429     AVFilterContext *last_filter = out->filter_ctx;
430     int pad_idx = out->pad_idx;
431     int ret;
432     char name[255];
433
434     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
435     ret = avfilter_graph_create_filter(&ofilter->filter,
436                                        avfilter_get_by_name("buffersink"),
437                                        name, NULL, NULL, fg->graph);
438
439     if (ret < 0)
440         return ret;
441
442     if (!hw_device_ctx && (ofilter->width || ofilter->height)) {
443         char args[255];
444         AVFilterContext *filter;
445         AVDictionaryEntry *e = NULL;
446
447         snprintf(args, sizeof(args), "%d:%d",
448                  ofilter->width, ofilter->height);
449
450         while ((e = av_dict_get(ost->sws_dict, "", e,
451                                 AV_DICT_IGNORE_SUFFIX))) {
452             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
453         }
454
455         snprintf(name, sizeof(name), "scaler_out_%d_%d",
456                  ost->file_index, ost->index);
457         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
458                                                 name, args, NULL, fg->graph)) < 0)
459             return ret;
460         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
461             return ret;
462
463         last_filter = filter;
464         pad_idx = 0;
465     }
466
467     if ((pix_fmts = choose_pix_fmts(ofilter))) {
468         AVFilterContext *filter;
469         snprintf(name, sizeof(name), "format_out_%d_%d",
470                  ost->file_index, ost->index);
471         ret = avfilter_graph_create_filter(&filter,
472                                            avfilter_get_by_name("format"),
473                                            "format", pix_fmts, NULL, fg->graph);
474         av_freep(&pix_fmts);
475         if (ret < 0)
476             return ret;
477         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
478             return ret;
479
480         last_filter = filter;
481         pad_idx     = 0;
482     }
483
484     if (ost->frame_rate.num && 0) {
485         AVFilterContext *fps;
486         char args[255];
487
488         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
489                  ost->frame_rate.den);
490         snprintf(name, sizeof(name), "fps_out_%d_%d",
491                  ost->file_index, ost->index);
492         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
493                                            name, args, NULL, fg->graph);
494         if (ret < 0)
495             return ret;
496
497         ret = avfilter_link(last_filter, pad_idx, fps, 0);
498         if (ret < 0)
499             return ret;
500         last_filter = fps;
501         pad_idx = 0;
502     }
503
504     snprintf(name, sizeof(name), "trim_out_%d_%d",
505              ost->file_index, ost->index);
506     ret = insert_trim(of->start_time, of->recording_time,
507                       &last_filter, &pad_idx, name);
508     if (ret < 0)
509         return ret;
510
511
512     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
513         return ret;
514
515     return 0;
516 }
517
518 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
519 {
520     OutputStream *ost = ofilter->ost;
521     OutputFile    *of = output_files[ost->file_index];
522     AVCodecContext *codec  = ost->enc_ctx;
523     AVFilterContext *last_filter = out->filter_ctx;
524     int pad_idx = out->pad_idx;
525     char *sample_fmts, *sample_rates, *channel_layouts;
526     char name[255];
527     int ret;
528
529     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
530     ret = avfilter_graph_create_filter(&ofilter->filter,
531                                        avfilter_get_by_name("abuffersink"),
532                                        name, NULL, NULL, fg->graph);
533     if (ret < 0)
534         return ret;
535     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
536         return ret;
537
538 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
539     AVFilterContext *filt_ctx;                                              \
540                                                                             \
541     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
542            "similarly to -af " filter_name "=%s.\n", arg);                  \
543                                                                             \
544     ret = avfilter_graph_create_filter(&filt_ctx,                           \
545                                        avfilter_get_by_name(filter_name),   \
546                                        filter_name, arg, NULL, fg->graph);  \
547     if (ret < 0)                                                            \
548         return ret;                                                         \
549                                                                             \
550     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
551     if (ret < 0)                                                            \
552         return ret;                                                         \
553                                                                             \
554     last_filter = filt_ctx;                                                 \
555     pad_idx = 0;                                                            \
556 } while (0)
557     if (ost->audio_channels_mapped) {
558         int i;
559         AVBPrint pan_buf;
560         av_bprint_init(&pan_buf, 256, 8192);
561         av_bprintf(&pan_buf, "0x%"PRIx64,
562                    av_get_default_channel_layout(ost->audio_channels_mapped));
563         for (i = 0; i < ost->audio_channels_mapped; i++)
564             if (ost->audio_channels_map[i] != -1)
565                 av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
566
567         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
568         av_bprint_finalize(&pan_buf, NULL);
569     }
570
571     if (codec->channels && !codec->channel_layout)
572         codec->channel_layout = av_get_default_channel_layout(codec->channels);
573
574     sample_fmts     = choose_sample_fmts(ofilter);
575     sample_rates    = choose_sample_rates(ofilter);
576     channel_layouts = choose_channel_layouts(ofilter);
577     if (sample_fmts || sample_rates || channel_layouts) {
578         AVFilterContext *format;
579         char args[256];
580         args[0] = 0;
581
582         if (sample_fmts)
583             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
584                             sample_fmts);
585         if (sample_rates)
586             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
587                             sample_rates);
588         if (channel_layouts)
589             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
590                             channel_layouts);
591
592         av_freep(&sample_fmts);
593         av_freep(&sample_rates);
594         av_freep(&channel_layouts);
595
596         snprintf(name, sizeof(name), "format_out_%d_%d",
597                  ost->file_index, ost->index);
598         ret = avfilter_graph_create_filter(&format,
599                                            avfilter_get_by_name("aformat"),
600                                            name, args, NULL, fg->graph);
601         if (ret < 0)
602             return ret;
603
604         ret = avfilter_link(last_filter, pad_idx, format, 0);
605         if (ret < 0)
606             return ret;
607
608         last_filter = format;
609         pad_idx = 0;
610     }
611
612     if (audio_volume != 256 && 0) {
613         char args[256];
614
615         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
616         AUTO_INSERT_FILTER("-vol", "volume", args);
617     }
618
619     if (ost->apad && of->shortest) {
620         char args[256];
621         int i;
622
623         for (i=0; i<of->ctx->nb_streams; i++)
624             if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
625                 break;
626
627         if (i<of->ctx->nb_streams) {
628             snprintf(args, sizeof(args), "%s", ost->apad);
629             AUTO_INSERT_FILTER("-apad", "apad", args);
630         }
631     }
632
633     snprintf(name, sizeof(name), "trim for output stream %d:%d",
634              ost->file_index, ost->index);
635     ret = insert_trim(of->start_time, of->recording_time,
636                       &last_filter, &pad_idx, name);
637     if (ret < 0)
638         return ret;
639
640     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
641         return ret;
642
643     return 0;
644 }
645
646 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
647 {                                                                  \
648     AVFilterContext *ctx = inout->filter_ctx;                      \
649     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
650     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
651     AVIOContext *pb;                                               \
652                                                                    \
653     if (avio_open_dyn_buf(&pb) < 0)                                \
654         exit_program(1);                                           \
655                                                                    \
656     avio_printf(pb, "%s", ctx->filter->name);                      \
657     if (nb_pads > 1)                                               \
658         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
659     avio_w8(pb, 0);                                                \
660     avio_close_dyn_buf(pb, &f->name);                              \
661 }
662
663 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
664 {
665     av_freep(&ofilter->name);
666     DESCRIBE_FILTER_LINK(ofilter, out, 0);
667
668     if (!ofilter->ost) {
669         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
670         exit_program(1);
671     }
672
673     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
674     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
675     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
676     default: av_assert0(0);
677     }
678 }
679
680 static int sub2video_prepare(InputStream *ist, InputFilter *ifilter)
681 {
682     AVFormatContext *avf = input_files[ist->file_index]->ctx;
683     int i, w, h;
684
685     /* Compute the size of the canvas for the subtitles stream.
686        If the subtitles codecpar has set a size, use it. Otherwise use the
687        maximum dimensions of the video streams in the same file. */
688     w = ifilter->width;
689     h = ifilter->height;
690     if (!(w && h)) {
691         for (i = 0; i < avf->nb_streams; i++) {
692             if (avf->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
693                 w = FFMAX(w, avf->streams[i]->codecpar->width);
694                 h = FFMAX(h, avf->streams[i]->codecpar->height);
695             }
696         }
697         if (!(w && h)) {
698             w = FFMAX(w, 720);
699             h = FFMAX(h, 576);
700         }
701         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
702     }
703     ist->sub2video.w = ifilter->width  = w;
704     ist->sub2video.h = ifilter->height = h;
705
706     ifilter->width  = ist->dec_ctx->width  ? ist->dec_ctx->width  : ist->sub2video.w;
707     ifilter->height = ist->dec_ctx->height ? ist->dec_ctx->height : ist->sub2video.h;
708
709     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
710        palettes for all rectangles are identical or compatible */
711     ifilter->format = AV_PIX_FMT_RGB32;
712
713     ist->sub2video.frame = av_frame_alloc();
714     if (!ist->sub2video.frame)
715         return AVERROR(ENOMEM);
716     ist->sub2video.last_pts = INT64_MIN;
717     return 0;
718 }
719
720 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
721                                         AVFilterInOut *in)
722 {
723     AVFilterContext *last_filter;
724     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
725     InputStream *ist = ifilter->ist;
726     InputFile     *f = input_files[ist->file_index];
727     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
728                                          ist->st->time_base;
729     AVRational fr = ist->framerate;
730     AVRational sar;
731     AVBPrint args;
732     char name[255];
733     int ret, pad_idx = 0;
734     int64_t tsoffset = 0;
735     AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
736
737     if (!par)
738         return AVERROR(ENOMEM);
739     memset(par, 0, sizeof(*par));
740     par->format = AV_PIX_FMT_NONE;
741
742     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
743         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
744         ret = AVERROR(EINVAL);
745         goto fail;
746     }
747
748     if (!fr.num)
749         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
750
751     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
752         ret = sub2video_prepare(ist, ifilter);
753         if (ret < 0)
754             goto fail;
755     }
756
757     sar = ifilter->sample_aspect_ratio;
758     if(!sar.den)
759         sar = (AVRational){0,1};
760     av_bprint_init(&args, 0, 1);
761     av_bprintf(&args,
762              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
763              "pixel_aspect=%d/%d:sws_param=flags=%d",
764              ifilter->width, ifilter->height, ifilter->format,
765              tb.num, tb.den, sar.num, sar.den,
766              SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
767     if (fr.num && fr.den)
768         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
769     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
770              ist->file_index, ist->st->index);
771
772
773     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
774                                             args.str, NULL, fg->graph)) < 0)
775         goto fail;
776     par->hw_frames_ctx = ifilter->hw_frames_ctx;
777     ret = av_buffersrc_parameters_set(ifilter->filter, par);
778     if (ret < 0)
779         goto fail;
780     av_freep(&par);
781     last_filter = ifilter->filter;
782
783     if (ist->autorotate) {
784         double theta = get_rotation(ist->st);
785
786         if (fabs(theta - 90) < 1.0) {
787             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
788         } else if (fabs(theta - 180) < 1.0) {
789             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
790             if (ret < 0)
791                 return ret;
792             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
793         } else if (fabs(theta - 270) < 1.0) {
794             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
795         } else if (fabs(theta) > 1.0) {
796             char rotate_buf[64];
797             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
798             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
799         }
800         if (ret < 0)
801             return ret;
802     }
803
804     if (ist->framerate.num) {
805         AVFilterContext *setpts;
806
807         snprintf(name, sizeof(name), "forcecfr_in_%d_%d",
808                  ist->file_index, ist->st->index);
809         if ((ret = avfilter_graph_create_filter(&setpts,
810                                                 avfilter_get_by_name("setpts"),
811                                                 name, "N", NULL,
812                                                 fg->graph)) < 0)
813             return ret;
814
815         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
816             return ret;
817
818         last_filter = setpts;
819     }
820
821     if (do_deinterlace) {
822         AVFilterContext *yadif;
823
824         snprintf(name, sizeof(name), "deinterlace_in_%d_%d",
825                  ist->file_index, ist->st->index);
826         if ((ret = avfilter_graph_create_filter(&yadif,
827                                                 avfilter_get_by_name("yadif"),
828                                                 name, "", NULL,
829                                                 fg->graph)) < 0)
830             return ret;
831
832         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
833             return ret;
834
835         last_filter = yadif;
836     }
837
838     snprintf(name, sizeof(name), "trim_in_%d_%d",
839              ist->file_index, ist->st->index);
840     if (copy_ts) {
841         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
842         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
843             tsoffset += f->ctx->start_time;
844     }
845     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
846                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
847                       &last_filter, &pad_idx, name);
848     if (ret < 0)
849         return ret;
850
851     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
852         return ret;
853     return 0;
854 fail:
855     av_freep(&par);
856
857     return ret;
858 }
859
860 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
861                                         AVFilterInOut *in)
862 {
863     AVFilterContext *last_filter;
864     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
865     InputStream *ist = ifilter->ist;
866     InputFile     *f = input_files[ist->file_index];
867     AVBPrint args;
868     char name[255];
869     int ret, pad_idx = 0;
870     int64_t tsoffset = 0;
871
872     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
873         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
874         return AVERROR(EINVAL);
875     }
876
877     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
878     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
879              1, ifilter->sample_rate,
880              ifilter->sample_rate,
881              av_get_sample_fmt_name(ifilter->format));
882     if (ifilter->channel_layout)
883         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
884                    ifilter->channel_layout);
885     else
886         av_bprintf(&args, ":channels=%d", ifilter->channels);
887     snprintf(name, sizeof(name), "graph_%d_in_%d_%d", fg->index,
888              ist->file_index, ist->st->index);
889
890     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
891                                             name, args.str, NULL,
892                                             fg->graph)) < 0)
893         return ret;
894     last_filter = ifilter->filter;
895
896 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
897     AVFilterContext *filt_ctx;                                              \
898                                                                             \
899     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
900            "similarly to -af " filter_name "=%s.\n", arg);                  \
901                                                                             \
902     snprintf(name, sizeof(name), "graph_%d_%s_in_%d_%d",      \
903                 fg->index, filter_name, ist->file_index, ist->st->index);   \
904     ret = avfilter_graph_create_filter(&filt_ctx,                           \
905                                        avfilter_get_by_name(filter_name),   \
906                                        name, arg, NULL, fg->graph);         \
907     if (ret < 0)                                                            \
908         return ret;                                                         \
909                                                                             \
910     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
911     if (ret < 0)                                                            \
912         return ret;                                                         \
913                                                                             \
914     last_filter = filt_ctx;                                                 \
915 } while (0)
916
917     if (audio_sync_method > 0) {
918         char args[256] = {0};
919
920         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
921         if (audio_drift_threshold != 0.1)
922             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
923         if (!fg->reconfiguration)
924             av_strlcatf(args, sizeof(args), ":first_pts=0");
925         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
926     }
927
928 //     if (ost->audio_channels_mapped) {
929 //         int i;
930 //         AVBPrint pan_buf;
931 //         av_bprint_init(&pan_buf, 256, 8192);
932 //         av_bprintf(&pan_buf, "0x%"PRIx64,
933 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
934 //         for (i = 0; i < ost->audio_channels_mapped; i++)
935 //             if (ost->audio_channels_map[i] != -1)
936 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
937 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
938 //         av_bprint_finalize(&pan_buf, NULL);
939 //     }
940
941     if (audio_volume != 256) {
942         char args[256];
943
944         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
945                "audio filter instead.\n");
946
947         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
948         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
949     }
950
951     snprintf(name, sizeof(name), "trim for input stream %d:%d",
952              ist->file_index, ist->st->index);
953     if (copy_ts) {
954         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
955         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
956             tsoffset += f->ctx->start_time;
957     }
958     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
959                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
960                       &last_filter, &pad_idx, name);
961     if (ret < 0)
962         return ret;
963
964     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
965         return ret;
966
967     return 0;
968 }
969
970 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
971                                   AVFilterInOut *in)
972 {
973     av_freep(&ifilter->name);
974     DESCRIBE_FILTER_LINK(ifilter, in, 1);
975
976     if (!ifilter->ist->dec) {
977         av_log(NULL, AV_LOG_ERROR,
978                "No decoder for stream #%d:%d, filtering impossible\n",
979                ifilter->ist->file_index, ifilter->ist->st->index);
980         return AVERROR_DECODER_NOT_FOUND;
981     }
982     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
983     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
984     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
985     default: av_assert0(0);
986     }
987 }
988
989 int configure_filtergraph(FilterGraph *fg)
990 {
991     AVFilterInOut *inputs, *outputs, *cur;
992     int ret, i, simple = filtergraph_is_simple(fg);
993     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
994                                       fg->graph_desc;
995
996     avfilter_graph_free(&fg->graph);
997     if (!(fg->graph = avfilter_graph_alloc()))
998         return AVERROR(ENOMEM);
999
1000     if (simple) {
1001         OutputStream *ost = fg->outputs[0]->ost;
1002         char args[512];
1003         AVDictionaryEntry *e = NULL;
1004
1005         fg->graph->nb_threads = filter_nbthreads;
1006
1007         args[0] = 0;
1008         while ((e = av_dict_get(ost->sws_dict, "", e,
1009                                 AV_DICT_IGNORE_SUFFIX))) {
1010             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1011         }
1012         if (strlen(args))
1013             args[strlen(args)-1] = 0;
1014         fg->graph->scale_sws_opts = av_strdup(args);
1015
1016         args[0] = 0;
1017         while ((e = av_dict_get(ost->swr_opts, "", e,
1018                                 AV_DICT_IGNORE_SUFFIX))) {
1019             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1020         }
1021         if (strlen(args))
1022             args[strlen(args)-1] = 0;
1023         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
1024
1025         args[0] = '\0';
1026         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
1027                                 AV_DICT_IGNORE_SUFFIX))) {
1028             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1029         }
1030         if (strlen(args))
1031             args[strlen(args) - 1] = '\0';
1032         fg->graph->resample_lavr_opts = av_strdup(args);
1033
1034         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
1035         if (e)
1036             av_opt_set(fg->graph, "threads", e->value, 0);
1037     } else {
1038         fg->graph->nb_threads = filter_complex_nbthreads;
1039     }
1040
1041     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1042         return ret;
1043
1044     if (hw_device_ctx) {
1045         for (i = 0; i < fg->graph->nb_filters; i++) {
1046             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
1047         }
1048     }
1049
1050     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1051         const char *num_inputs;
1052         const char *num_outputs;
1053         if (!outputs) {
1054             num_outputs = "0";
1055         } else if (outputs->next) {
1056             num_outputs = ">1";
1057         } else {
1058             num_outputs = "1";
1059         }
1060         if (!inputs) {
1061             num_inputs = "0";
1062         } else if (inputs->next) {
1063             num_inputs = ">1";
1064         } else {
1065             num_inputs = "1";
1066         }
1067         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1068                "to have exactly 1 input and 1 output."
1069                " However, it had %s input(s) and %s output(s)."
1070                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1071                graph_desc, num_inputs, num_outputs);
1072         return AVERROR(EINVAL);
1073     }
1074
1075     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1076         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1077             avfilter_inout_free(&inputs);
1078             avfilter_inout_free(&outputs);
1079             return ret;
1080         }
1081     avfilter_inout_free(&inputs);
1082
1083     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1084         configure_output_filter(fg, fg->outputs[i], cur);
1085     avfilter_inout_free(&outputs);
1086
1087     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1088         return ret;
1089
1090     /* limit the lists of allowed formats to the ones selected, to
1091      * make sure they stay the same if the filtergraph is reconfigured later */
1092     for (i = 0; i < fg->nb_outputs; i++) {
1093         OutputFilter *ofilter = fg->outputs[i];
1094         AVFilterContext *sink = ofilter->filter;
1095
1096         ofilter->format = av_buffersink_get_format(sink);
1097
1098         ofilter->width  = av_buffersink_get_w(sink);
1099         ofilter->height = av_buffersink_get_h(sink);
1100
1101         ofilter->sample_rate    = av_buffersink_get_sample_rate(sink);
1102         ofilter->channel_layout = av_buffersink_get_channel_layout(sink);
1103     }
1104
1105     fg->reconfiguration = 1;
1106
1107     for (i = 0; i < fg->nb_outputs; i++) {
1108         OutputStream *ost = fg->outputs[i]->ost;
1109         if (!ost->enc) {
1110             /* identical to the same check in ffmpeg.c, needed because
1111                complex filter graphs are initialized earlier */
1112             av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
1113                      avcodec_get_name(ost->st->codecpar->codec_id), ost->file_index, ost->index);
1114             return AVERROR(EINVAL);
1115         }
1116         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1117             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1118             av_buffersink_set_frame_size(ost->filter->filter,
1119                                          ost->enc_ctx->frame_size);
1120     }
1121
1122     return 0;
1123 }
1124
1125 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
1126 {
1127     av_buffer_unref(&ifilter->hw_frames_ctx);
1128
1129     ifilter->format = frame->format;
1130
1131     ifilter->width               = frame->width;
1132     ifilter->height              = frame->height;
1133     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
1134
1135     ifilter->sample_rate         = frame->sample_rate;
1136     ifilter->channels            = av_frame_get_channels(frame);
1137     ifilter->channel_layout      = frame->channel_layout;
1138
1139     if (frame->hw_frames_ctx) {
1140         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
1141         if (!ifilter->hw_frames_ctx)
1142             return AVERROR(ENOMEM);
1143     }
1144
1145     return 0;
1146 }
1147
1148 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1149 {
1150     int i;
1151     for (i = 0; i < fg->nb_inputs; i++)
1152         if (fg->inputs[i]->ist == ist)
1153             return 1;
1154     return 0;
1155 }
1156
1157 int filtergraph_is_simple(FilterGraph *fg)
1158 {
1159     return !fg->graph_desc;
1160 }