Libav
avfiltergraph.c
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1 /*
2  * filter graphs
3  * Copyright (c) 2008 Vitor Sessak
4  * Copyright (c) 2007 Bobby Bingham
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config.h"
24 
25 #include <string.h>
26 
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
30 #include "libavutil/common.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/log.h"
33 #include "libavutil/opt.h"
34 
35 #include "avfilter.h"
36 #include "formats.h"
37 #include "internal.h"
38 #include "thread.h"
39 
40 #define OFFSET(x) offsetof(AVFilterGraph, x)
41 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
42 static const AVOption filtergraph_options[] = {
43  { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
44  { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
45  { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
46  { "threads", "Maximum number of threads", OFFSET(nb_threads),
47  AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
48  { NULL },
49 };
50 
51 static const AVClass filtergraph_class = {
52  .class_name = "AVFilterGraph",
53  .item_name = av_default_item_name,
54  .version = LIBAVUTIL_VERSION_INT,
55  .option = filtergraph_options,
56 };
57 
58 #if !HAVE_THREADS
60 {
61 }
62 
64 {
65  graph->thread_type = 0;
66  graph->nb_threads = 1;
67  return 0;
68 }
69 #endif
70 
72 {
73  AVFilterGraph *ret = av_mallocz(sizeof(*ret));
74  if (!ret)
75  return NULL;
76 
77  ret->internal = av_mallocz(sizeof(*ret->internal));
78  if (!ret->internal) {
79  av_freep(&ret);
80  return NULL;
81  }
82 
85 
86  return ret;
87 }
88 
90 {
91  int i;
92  for (i = 0; i < graph->nb_filters; i++) {
93  if (graph->filters[i] == filter) {
94  FFSWAP(AVFilterContext*, graph->filters[i],
95  graph->filters[graph->nb_filters - 1]);
96  graph->nb_filters--;
97  return;
98  }
99  }
100 }
101 
103 {
104  if (!*graph)
105  return;
106 
107  while ((*graph)->nb_filters)
108  avfilter_free((*graph)->filters[0]);
109 
110  ff_graph_thread_free(*graph);
111 
112  av_freep(&(*graph)->scale_sws_opts);
113  av_freep(&(*graph)->resample_lavr_opts);
114  av_freep(&(*graph)->filters);
115  av_freep(&(*graph)->internal);
116  av_freep(graph);
117 }
118 
119 #if FF_API_AVFILTER_OPEN
120 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
121 {
122  AVFilterContext **filters = av_realloc(graph->filters,
123  sizeof(*filters) * (graph->nb_filters + 1));
124  if (!filters)
125  return AVERROR(ENOMEM);
126 
127  graph->filters = filters;
128  graph->filters[graph->nb_filters++] = filter;
129 
130 #if FF_API_FOO_COUNT
132  graph->filter_count = graph->nb_filters;
134 #endif
135 
136  filter->graph = graph;
137 
138  return 0;
139 }
140 #endif
141 
143  const char *name, const char *args, void *opaque,
144  AVFilterGraph *graph_ctx)
145 {
146  int ret;
147 
148  *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
149  if (!*filt_ctx)
150  return AVERROR(ENOMEM);
151 
152  ret = avfilter_init_str(*filt_ctx, args);
153  if (ret < 0)
154  goto fail;
155 
156  return 0;
157 
158 fail:
159  if (*filt_ctx)
160  avfilter_free(*filt_ctx);
161  *filt_ctx = NULL;
162  return ret;
163 }
164 
166  const AVFilter *filter,
167  const char *name)
168 {
169  AVFilterContext **filters, *s;
170 
171  if (graph->thread_type && !graph->internal->thread_execute) {
172  if (graph->execute) {
173  graph->internal->thread_execute = graph->execute;
174  } else {
175  int ret = ff_graph_thread_init(graph);
176  if (ret < 0) {
177  av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
178  return NULL;
179  }
180  }
181  }
182 
183  s = ff_filter_alloc(filter, name);
184  if (!s)
185  return NULL;
186 
187  filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
188  if (!filters) {
189  avfilter_free(s);
190  return NULL;
191  }
192 
193  graph->filters = filters;
194  graph->filters[graph->nb_filters++] = s;
195 
196 #if FF_API_FOO_COUNT
198  graph->filter_count = graph->nb_filters;
200 #endif
201 
202  s->graph = graph;
203 
204  return s;
205 }
206 
215 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
216 {
217  AVFilterContext *filt;
218  int i, j;
219 
220  for (i = 0; i < graph->nb_filters; i++) {
221  filt = graph->filters[i];
222 
223  for (j = 0; j < filt->nb_inputs; j++) {
224  if (!filt->inputs[j] || !filt->inputs[j]->src) {
225  av_log(log_ctx, AV_LOG_ERROR,
226  "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
227  filt->input_pads[j].name, filt->name, filt->filter->name);
228  return AVERROR(EINVAL);
229  }
230  }
231 
232  for (j = 0; j < filt->nb_outputs; j++) {
233  if (!filt->outputs[j] || !filt->outputs[j]->dst) {
234  av_log(log_ctx, AV_LOG_ERROR,
235  "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
236  filt->output_pads[j].name, filt->name, filt->filter->name);
237  return AVERROR(EINVAL);
238  }
239  }
240  }
241 
242  return 0;
243 }
244 
250 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
251 {
252  AVFilterContext *filt;
253  int i, ret;
254 
255  for (i = 0; i < graph->nb_filters; i++) {
256  filt = graph->filters[i];
257 
258  if (!filt->nb_outputs) {
259  if ((ret = avfilter_config_links(filt)))
260  return ret;
261  }
262  }
263 
264  return 0;
265 }
266 
268 {
269  int i;
270 
271  for (i = 0; i < graph->nb_filters; i++)
272  if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
273  return graph->filters[i];
274 
275  return NULL;
276 }
277 
278 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
279 {
280  int i, j, ret;
281  int scaler_count = 0, resampler_count = 0;
282 
283  /* ask all the sub-filters for their supported media formats */
284  for (i = 0; i < graph->nb_filters; i++) {
285  if (graph->filters[i]->filter->query_formats)
286  graph->filters[i]->filter->query_formats(graph->filters[i]);
287  else
289  }
290 
291  /* go through and merge as many format lists as possible */
292  for (i = 0; i < graph->nb_filters; i++) {
293  AVFilterContext *filter = graph->filters[i];
294 
295  for (j = 0; j < filter->nb_inputs; j++) {
296  AVFilterLink *link = filter->inputs[j];
297  int convert_needed = 0;
298 
299  if (!link)
300  continue;
301 
302  if (link->in_formats != link->out_formats &&
304  link->out_formats))
305  convert_needed = 1;
306  if (link->type == AVMEDIA_TYPE_AUDIO) {
307  if (link->in_channel_layouts != link->out_channel_layouts &&
309  link->out_channel_layouts))
310  convert_needed = 1;
311  if (link->in_samplerates != link->out_samplerates &&
313  link->out_samplerates))
314  convert_needed = 1;
315  }
316 
317  if (convert_needed) {
318  AVFilterContext *convert;
319  AVFilter *filter;
320  AVFilterLink *inlink, *outlink;
321  char scale_args[256];
322  char inst_name[30];
323 
324  /* couldn't merge format lists. auto-insert conversion filter */
325  switch (link->type) {
326  case AVMEDIA_TYPE_VIDEO:
327  if (!(filter = avfilter_get_by_name("scale"))) {
328  av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
329  "not present, cannot convert pixel formats.\n");
330  return AVERROR(EINVAL);
331  }
332 
333  snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
334  scaler_count++);
335 
336  if ((ret = avfilter_graph_create_filter(&convert, filter,
337  inst_name, graph->scale_sws_opts, NULL,
338  graph)) < 0)
339  return ret;
340  break;
341  case AVMEDIA_TYPE_AUDIO:
342  if (!(filter = avfilter_get_by_name("resample"))) {
343  av_log(log_ctx, AV_LOG_ERROR, "'resample' filter "
344  "not present, cannot convert audio formats.\n");
345  return AVERROR(EINVAL);
346  }
347 
348  snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
349  resampler_count++);
350  scale_args[0] = '\0';
351  if (graph->resample_lavr_opts)
352  snprintf(scale_args, sizeof(scale_args), "%s",
353  graph->resample_lavr_opts);
354  if ((ret = avfilter_graph_create_filter(&convert, filter,
355  inst_name, scale_args,
356  NULL, graph)) < 0)
357  return ret;
358  break;
359  default:
360  return AVERROR(EINVAL);
361  }
362 
363  if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
364  return ret;
365 
366  convert->filter->query_formats(convert);
367  inlink = convert->inputs[0];
368  outlink = convert->outputs[0];
369  if (!ff_merge_formats( inlink->in_formats, inlink->out_formats) ||
370  !ff_merge_formats(outlink->in_formats, outlink->out_formats))
371  ret |= AVERROR(ENOSYS);
372  if (inlink->type == AVMEDIA_TYPE_AUDIO &&
374  inlink->out_samplerates) ||
376  inlink->out_channel_layouts)))
377  ret |= AVERROR(ENOSYS);
378  if (outlink->type == AVMEDIA_TYPE_AUDIO &&
380  outlink->out_samplerates) ||
382  outlink->out_channel_layouts)))
383  ret |= AVERROR(ENOSYS);
384 
385  if (ret < 0) {
386  av_log(log_ctx, AV_LOG_ERROR,
387  "Impossible to convert between the formats supported by the filter "
388  "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
389  return ret;
390  }
391  }
392  }
393  }
394 
395  return 0;
396 }
397 
398 static int pick_format(AVFilterLink *link)
399 {
400  if (!link || !link->in_formats)
401  return 0;
402 
403  link->in_formats->nb_formats = 1;
404  link->format = link->in_formats->formats[0];
405 
406  if (link->type == AVMEDIA_TYPE_AUDIO) {
407  if (!link->in_samplerates->nb_formats) {
408  av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
409  " the link between filters %s and %s.\n", link->src->name,
410  link->dst->name);
411  return AVERROR(EINVAL);
412  }
413  link->in_samplerates->nb_formats = 1;
414  link->sample_rate = link->in_samplerates->formats[0];
415 
417  av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
418  "the link between filters %s and %s.\n", link->src->name,
419  link->dst->name);
420  return AVERROR(EINVAL);
421  }
424  }
425 
432 
433  return 0;
434 }
435 
436 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
437 do { \
438  for (i = 0; i < filter->nb_inputs; i++) { \
439  AVFilterLink *link = filter->inputs[i]; \
440  fmt_type fmt; \
441  \
442  if (!link->out_ ## list || link->out_ ## list->nb != 1) \
443  continue; \
444  fmt = link->out_ ## list->var[0]; \
445  \
446  for (j = 0; j < filter->nb_outputs; j++) { \
447  AVFilterLink *out_link = filter->outputs[j]; \
448  list_type *fmts; \
449  \
450  if (link->type != out_link->type || \
451  out_link->in_ ## list->nb == 1) \
452  continue; \
453  fmts = out_link->in_ ## list; \
454  \
455  if (!out_link->in_ ## list->nb) { \
456  add_format(&out_link->in_ ##list, fmt); \
457  break; \
458  } \
459  \
460  for (k = 0; k < out_link->in_ ## list->nb; k++) \
461  if (fmts->var[k] == fmt) { \
462  fmts->var[0] = fmt; \
463  fmts->nb = 1; \
464  ret = 1; \
465  break; \
466  } \
467  } \
468  } \
469 } while (0)
470 
472 {
473  int i, j, k, ret = 0;
474 
476  nb_formats, ff_add_format);
477  REDUCE_FORMATS(int, AVFilterFormats, samplerates, formats,
478  nb_formats, ff_add_format);
479  REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
480  channel_layouts, nb_channel_layouts, ff_add_channel_layout);
481 
482  return ret;
483 }
484 
485 static void reduce_formats(AVFilterGraph *graph)
486 {
487  int i, reduced;
488 
489  do {
490  reduced = 0;
491 
492  for (i = 0; i < graph->nb_filters; i++)
493  reduced |= reduce_formats_on_filter(graph->filters[i]);
494  } while (reduced);
495 }
496 
498 {
499  AVFilterLink *link = NULL;
500  int sample_rate;
501  int i, j;
502 
503  for (i = 0; i < filter->nb_inputs; i++) {
504  link = filter->inputs[i];
505 
506  if (link->type == AVMEDIA_TYPE_AUDIO &&
507  link->out_samplerates->nb_formats== 1)
508  break;
509  }
510  if (i == filter->nb_inputs)
511  return;
512 
513  sample_rate = link->out_samplerates->formats[0];
514 
515  for (i = 0; i < filter->nb_outputs; i++) {
516  AVFilterLink *outlink = filter->outputs[i];
517  int best_idx, best_diff = INT_MAX;
518 
519  if (outlink->type != AVMEDIA_TYPE_AUDIO ||
520  outlink->in_samplerates->nb_formats < 2)
521  continue;
522 
523  for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
524  int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
525 
526  if (diff < best_diff) {
527  best_diff = diff;
528  best_idx = j;
529  }
530  }
531  FFSWAP(int, outlink->in_samplerates->formats[0],
532  outlink->in_samplerates->formats[best_idx]);
533  }
534 }
535 
536 static void swap_samplerates(AVFilterGraph *graph)
537 {
538  int i;
539 
540  for (i = 0; i < graph->nb_filters; i++)
542 }
543 
544 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
545 #define CH_FRONT_PAIR (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT)
546 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT | AV_CH_STEREO_RIGHT)
547 #define CH_WIDE_PAIR (AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT)
548 #define CH_SIDE_PAIR (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT)
549 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
550 #define CH_BACK_PAIR (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)
551 
552 /* allowable substitutions for channel pairs when comparing layouts,
553  * ordered by priority for both values */
554 static const uint64_t ch_subst[][2] = {
576 };
577 
579 {
580  AVFilterLink *link = NULL;
581  int i, j, k;
582 
583  for (i = 0; i < filter->nb_inputs; i++) {
584  link = filter->inputs[i];
585 
586  if (link->type == AVMEDIA_TYPE_AUDIO &&
588  break;
589  }
590  if (i == filter->nb_inputs)
591  return;
592 
593  for (i = 0; i < filter->nb_outputs; i++) {
594  AVFilterLink *outlink = filter->outputs[i];
595  int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
596 
597  if (outlink->type != AVMEDIA_TYPE_AUDIO ||
599  continue;
600 
601  for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
602  uint64_t in_chlayout = link->out_channel_layouts->channel_layouts[0];
603  uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
604  int in_channels = av_get_channel_layout_nb_channels(in_chlayout);
605  int out_channels = av_get_channel_layout_nb_channels(out_chlayout);
606  int count_diff = out_channels - in_channels;
607  int matched_channels, extra_channels;
608  int score = 0;
609 
610  /* channel substitution */
611  for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
612  uint64_t cmp0 = ch_subst[k][0];
613  uint64_t cmp1 = ch_subst[k][1];
614  if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
615  (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
616  in_chlayout &= ~cmp0;
617  out_chlayout &= ~cmp1;
618  /* add score for channel match, minus a deduction for
619  having to do the substitution */
620  score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
621  }
622  }
623 
624  /* no penalty for LFE channel mismatch */
625  if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
626  (out_chlayout & AV_CH_LOW_FREQUENCY))
627  score += 10;
628  in_chlayout &= ~AV_CH_LOW_FREQUENCY;
629  out_chlayout &= ~AV_CH_LOW_FREQUENCY;
630 
631  matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
632  out_chlayout);
633  extra_channels = av_get_channel_layout_nb_channels(out_chlayout &
634  (~in_chlayout));
635  score += 10 * matched_channels - 5 * extra_channels;
636 
637  if (score > best_score ||
638  (count_diff < best_count_diff && score == best_score)) {
639  best_score = score;
640  best_idx = j;
641  best_count_diff = count_diff;
642  }
643  }
644  av_assert0(best_idx >= 0);
645  FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
646  outlink->in_channel_layouts->channel_layouts[best_idx]);
647  }
648 
649 }
650 
652 {
653  int i;
654 
655  for (i = 0; i < graph->nb_filters; i++)
657 }
658 
660 {
661  AVFilterLink *link = NULL;
662  int format, bps;
663  int i, j;
664 
665  for (i = 0; i < filter->nb_inputs; i++) {
666  link = filter->inputs[i];
667 
668  if (link->type == AVMEDIA_TYPE_AUDIO &&
669  link->out_formats->nb_formats == 1)
670  break;
671  }
672  if (i == filter->nb_inputs)
673  return;
674 
675  format = link->out_formats->formats[0];
676  bps = av_get_bytes_per_sample(format);
677 
678  for (i = 0; i < filter->nb_outputs; i++) {
679  AVFilterLink *outlink = filter->outputs[i];
680  int best_idx = -1, best_score = INT_MIN;
681 
682  if (outlink->type != AVMEDIA_TYPE_AUDIO ||
683  outlink->in_formats->nb_formats < 2)
684  continue;
685 
686  for (j = 0; j < outlink->in_formats->nb_formats; j++) {
687  int out_format = outlink->in_formats->formats[j];
688  int out_bps = av_get_bytes_per_sample(out_format);
689  int score;
690 
691  if (av_get_packed_sample_fmt(out_format) == format ||
692  av_get_planar_sample_fmt(out_format) == format) {
693  best_idx = j;
694  break;
695  }
696 
697  /* for s32 and float prefer double to prevent loss of information */
698  if (bps == 4 && out_bps == 8) {
699  best_idx = j;
700  break;
701  }
702 
703  /* prefer closest higher or equal bps */
704  score = -abs(out_bps - bps);
705  if (out_bps >= bps)
706  score += INT_MAX/2;
707 
708  if (score > best_score) {
709  best_score = score;
710  best_idx = j;
711  }
712  }
713  av_assert0(best_idx >= 0);
714  FFSWAP(int, outlink->in_formats->formats[0],
715  outlink->in_formats->formats[best_idx]);
716  }
717 }
718 
719 static void swap_sample_fmts(AVFilterGraph *graph)
720 {
721  int i;
722 
723  for (i = 0; i < graph->nb_filters; i++)
725 
726 }
727 
728 static int pick_formats(AVFilterGraph *graph)
729 {
730  int i, j, ret;
731 
732  for (i = 0; i < graph->nb_filters; i++) {
733  AVFilterContext *filter = graph->filters[i];
734 
735  for (j = 0; j < filter->nb_inputs; j++)
736  if ((ret = pick_format(filter->inputs[j])) < 0)
737  return ret;
738  for (j = 0; j < filter->nb_outputs; j++)
739  if ((ret = pick_format(filter->outputs[j])) < 0)
740  return ret;
741  }
742  return 0;
743 }
744 
748 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
749 {
750  int ret;
751 
752  /* find supported formats from sub-filters, and merge along links */
753  if ((ret = query_formats(graph, log_ctx)) < 0)
754  return ret;
755 
756  /* Once everything is merged, it's possible that we'll still have
757  * multiple valid media format choices. We try to minimize the amount
758  * of format conversion inside filters */
759  reduce_formats(graph);
760 
761  /* for audio filters, ensure the best format, sample rate and channel layout
762  * is selected */
763  swap_sample_fmts(graph);
764  swap_samplerates(graph);
765  swap_channel_layouts(graph);
766 
767  if ((ret = pick_formats(graph)) < 0)
768  return ret;
769 
770  return 0;
771 }
772 
773 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
774 {
775  AVFilterContext *f;
776  int i, j, ret;
777  int fifo_count = 0;
778 
779  for (i = 0; i < graph->nb_filters; i++) {
780  f = graph->filters[i];
781 
782  for (j = 0; j < f->nb_inputs; j++) {
783  AVFilterLink *link = f->inputs[j];
784  AVFilterContext *fifo_ctx;
785  AVFilter *fifo;
786  char name[32];
787 
788  if (!link->dstpad->needs_fifo)
789  continue;
790 
791  fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
792  avfilter_get_by_name("fifo") :
793  avfilter_get_by_name("afifo");
794 
795  snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
796 
797  ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
798  NULL, graph);
799  if (ret < 0)
800  return ret;
801 
802  ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
803  if (ret < 0)
804  return ret;
805  }
806  }
807 
808  return 0;
809 }
810 
811 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
812 {
813  int ret;
814 
815  if ((ret = graph_check_validity(graphctx, log_ctx)))
816  return ret;
817  if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
818  return ret;
819  if ((ret = graph_config_formats(graphctx, log_ctx)))
820  return ret;
821  if ((ret = graph_config_links(graphctx, log_ctx)))
822  return ret;
823 
824  return 0;
825 }