LICENSE.md: add *_rect filters
[ffmpeg.git] / libavfilter / avfiltergraph.c
1 /*
2  * filter graphs
3  * Copyright (c) 2008 Vitor Sessak
4  * Copyright (c) 2007 Bobby Bingham
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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"
29 #include "libavutil/bprint.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.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|AV_OPT_FLAG_FILTERING_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     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
49         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
50     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
51         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
52     { NULL },
53 };
54
55 static const AVClass filtergraph_class = {
56     .class_name = "AVFilterGraph",
57     .item_name  = av_default_item_name,
58     .version    = LIBAVUTIL_VERSION_INT,
59     .option     = filtergraph_options,
60     .category   = AV_CLASS_CATEGORY_FILTER,
61 };
62
63 #if !HAVE_THREADS
64 void ff_graph_thread_free(AVFilterGraph *graph)
65 {
66 }
67
68 int ff_graph_thread_init(AVFilterGraph *graph)
69 {
70     graph->thread_type = 0;
71     graph->nb_threads  = 1;
72     return 0;
73 }
74 #endif
75
76 AVFilterGraph *avfilter_graph_alloc(void)
77 {
78     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
79     if (!ret)
80         return NULL;
81
82     ret->internal = av_mallocz(sizeof(*ret->internal));
83     if (!ret->internal) {
84         av_freep(&ret);
85         return NULL;
86     }
87
88     ret->av_class = &filtergraph_class;
89     av_opt_set_defaults(ret);
90
91     return ret;
92 }
93
94 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
95 {
96     int i;
97     for (i = 0; i < graph->nb_filters; i++) {
98         if (graph->filters[i] == filter) {
99             FFSWAP(AVFilterContext*, graph->filters[i],
100                    graph->filters[graph->nb_filters - 1]);
101             graph->nb_filters--;
102             return;
103         }
104     }
105 }
106
107 void avfilter_graph_free(AVFilterGraph **graph)
108 {
109     if (!*graph)
110         return;
111
112     while ((*graph)->nb_filters)
113         avfilter_free((*graph)->filters[0]);
114
115     ff_graph_thread_free(*graph);
116
117     av_freep(&(*graph)->sink_links);
118
119     av_freep(&(*graph)->scale_sws_opts);
120     av_freep(&(*graph)->aresample_swr_opts);
121     av_freep(&(*graph)->resample_lavr_opts);
122     av_freep(&(*graph)->filters);
123     av_freep(&(*graph)->internal);
124     av_freep(graph);
125 }
126
127 #if FF_API_AVFILTER_OPEN
128 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
129 {
130     AVFilterContext **filters = av_realloc(graph->filters,
131                                            sizeof(*filters) * (graph->nb_filters + 1));
132     if (!filters)
133         return AVERROR(ENOMEM);
134
135     graph->filters = filters;
136     graph->filters[graph->nb_filters++] = filter;
137
138 #if FF_API_FOO_COUNT
139 FF_DISABLE_DEPRECATION_WARNINGS
140     graph->filter_count_unused = graph->nb_filters;
141 FF_ENABLE_DEPRECATION_WARNINGS
142 #endif
143
144     filter->graph = graph;
145
146     return 0;
147 }
148 #endif
149
150 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
151                                  const char *name, const char *args, void *opaque,
152                                  AVFilterGraph *graph_ctx)
153 {
154     int ret;
155
156     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
157     if (!*filt_ctx)
158         return AVERROR(ENOMEM);
159
160     ret = avfilter_init_str(*filt_ctx, args);
161     if (ret < 0)
162         goto fail;
163
164     return 0;
165
166 fail:
167     if (*filt_ctx)
168         avfilter_free(*filt_ctx);
169     *filt_ctx = NULL;
170     return ret;
171 }
172
173 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
174 {
175     graph->disable_auto_convert = flags;
176 }
177
178 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
179                                              const AVFilter *filter,
180                                              const char *name)
181 {
182     AVFilterContext **filters, *s;
183
184     if (graph->thread_type && !graph->internal->thread_execute) {
185         if (graph->execute) {
186             graph->internal->thread_execute = graph->execute;
187         } else {
188             int ret = ff_graph_thread_init(graph);
189             if (ret < 0) {
190                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
191                 return NULL;
192             }
193         }
194     }
195
196     s = ff_filter_alloc(filter, name);
197     if (!s)
198         return NULL;
199
200     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
201     if (!filters) {
202         avfilter_free(s);
203         return NULL;
204     }
205
206     graph->filters = filters;
207     graph->filters[graph->nb_filters++] = s;
208
209 #if FF_API_FOO_COUNT
210 FF_DISABLE_DEPRECATION_WARNINGS
211     graph->filter_count_unused = graph->nb_filters;
212 FF_ENABLE_DEPRECATION_WARNINGS
213 #endif
214
215     s->graph = graph;
216
217     return s;
218 }
219
220 /**
221  * Check for the validity of graph.
222  *
223  * A graph is considered valid if all its input and output pads are
224  * connected.
225  *
226  * @return >= 0 in case of success, a negative value otherwise
227  */
228 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
229 {
230     AVFilterContext *filt;
231     int i, j;
232
233     for (i = 0; i < graph->nb_filters; i++) {
234         const AVFilterPad *pad;
235         filt = graph->filters[i];
236
237         for (j = 0; j < filt->nb_inputs; j++) {
238             if (!filt->inputs[j] || !filt->inputs[j]->src) {
239                 pad = &filt->input_pads[j];
240                 av_log(log_ctx, AV_LOG_ERROR,
241                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
242                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
243                 return AVERROR(EINVAL);
244             }
245         }
246
247         for (j = 0; j < filt->nb_outputs; j++) {
248             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
249                 pad = &filt->output_pads[j];
250                 av_log(log_ctx, AV_LOG_ERROR,
251                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
252                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
253                 return AVERROR(EINVAL);
254             }
255         }
256     }
257
258     return 0;
259 }
260
261 /**
262  * Configure all the links of graphctx.
263  *
264  * @return >= 0 in case of success, a negative value otherwise
265  */
266 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
267 {
268     AVFilterContext *filt;
269     int i, ret;
270
271     for (i = 0; i < graph->nb_filters; i++) {
272         filt = graph->filters[i];
273
274         if (!filt->nb_outputs) {
275             if ((ret = avfilter_config_links(filt)))
276                 return ret;
277         }
278     }
279
280     return 0;
281 }
282
283 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
284 {
285     int i;
286
287     for (i = 0; i < graph->nb_filters; i++)
288         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
289             return graph->filters[i];
290
291     return NULL;
292 }
293
294 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
295 {
296     if (!l)
297         return;
298     if (l->nb_channel_layouts) {
299         if (l->all_layouts || l->all_counts)
300             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
301         l->all_layouts = l->all_counts = 0;
302     } else {
303         if (l->all_counts && !l->all_layouts)
304             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
305         l->all_layouts = 1;
306     }
307 }
308
309 static int filter_query_formats(AVFilterContext *ctx)
310 {
311     int ret, i;
312     AVFilterFormats *formats;
313     AVFilterChannelLayouts *chlayouts;
314     AVFilterFormats *samplerates;
315     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
316                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
317                             AVMEDIA_TYPE_VIDEO;
318
319     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
320         if (ret != AVERROR(EAGAIN))
321             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
322                    ctx->name, av_err2str(ret));
323         return ret;
324     }
325
326     for (i = 0; i < ctx->nb_inputs; i++)
327         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
328     for (i = 0; i < ctx->nb_outputs; i++)
329         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
330
331     formats = ff_all_formats(type);
332     if (!formats)
333         return AVERROR(ENOMEM);
334     ff_set_common_formats(ctx, formats);
335     if (type == AVMEDIA_TYPE_AUDIO) {
336         samplerates = ff_all_samplerates();
337         if (!samplerates)
338             return AVERROR(ENOMEM);
339         ff_set_common_samplerates(ctx, samplerates);
340         chlayouts = ff_all_channel_layouts();
341         if (!chlayouts)
342             return AVERROR(ENOMEM);
343         ff_set_common_channel_layouts(ctx, chlayouts);
344     }
345     return 0;
346 }
347
348 static int formats_declared(AVFilterContext *f)
349 {
350     int i;
351
352     for (i = 0; i < f->nb_inputs; i++) {
353         if (!f->inputs[i]->out_formats)
354             return 0;
355         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
356             !(f->inputs[i]->out_samplerates &&
357               f->inputs[i]->out_channel_layouts))
358             return 0;
359     }
360     for (i = 0; i < f->nb_outputs; i++) {
361         if (!f->outputs[i]->in_formats)
362             return 0;
363         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
364             !(f->outputs[i]->in_samplerates &&
365               f->outputs[i]->in_channel_layouts))
366             return 0;
367     }
368     return 1;
369 }
370
371 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
372 {
373     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
374     if (a) {
375         a->refcount = 0;
376         a->refs     = NULL;
377         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
378         if (!a->formats && arg->formats)
379             av_freep(&a);
380     }
381     return a;
382 }
383
384 static int can_merge_formats(AVFilterFormats *a_arg,
385                              AVFilterFormats *b_arg,
386                              enum AVMediaType type,
387                              int is_sample_rate)
388 {
389     AVFilterFormats *a, *b, *ret;
390     if (a_arg == b_arg)
391         return 1;
392     a = clone_filter_formats(a_arg);
393     b = clone_filter_formats(b_arg);
394
395     if (!a || !b) {
396         if (a)
397             av_freep(&a->formats);
398         if (b)
399             av_freep(&b->formats);
400
401         av_freep(&a);
402         av_freep(&b);
403
404         return 0;
405     }
406
407     if (is_sample_rate) {
408         ret = ff_merge_samplerates(a, b);
409     } else {
410         ret = ff_merge_formats(a, b, type);
411     }
412     if (ret) {
413         av_freep(&ret->formats);
414         av_freep(&ret->refs);
415         av_freep(&ret);
416         return 1;
417     } else {
418         av_freep(&a->formats);
419         av_freep(&b->formats);
420         av_freep(&a);
421         av_freep(&b);
422         return 0;
423     }
424 }
425
426 /**
427  * Perform one round of query_formats() and merging formats lists on the
428  * filter graph.
429  * @return  >=0 if all links formats lists could be queried and merged;
430  *          AVERROR(EAGAIN) some progress was made in the queries or merging
431  *          and a later call may succeed;
432  *          AVERROR(EIO) (may be changed) plus a log message if no progress
433  *          was made and the negotiation is stuck;
434  *          a negative error code if some other error happened
435  */
436 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
437 {
438     int i, j, ret;
439     int scaler_count = 0, resampler_count = 0;
440     int count_queried = 0;        /* successful calls to query_formats() */
441     int count_merged = 0;         /* successful merge of formats lists */
442     int count_already_merged = 0; /* lists already merged */
443     int count_delayed = 0;        /* lists that need to be merged later */
444
445     for (i = 0; i < graph->nb_filters; i++) {
446         AVFilterContext *f = graph->filters[i];
447         if (formats_declared(f))
448             continue;
449         if (f->filter->query_formats)
450             ret = filter_query_formats(f);
451         else
452             ret = ff_default_query_formats(f);
453         if (ret < 0 && ret != AVERROR(EAGAIN))
454             return ret;
455         /* note: EAGAIN could indicate a partial success, not counted yet */
456         count_queried += ret >= 0;
457     }
458
459     /* go through and merge as many format lists as possible */
460     for (i = 0; i < graph->nb_filters; i++) {
461         AVFilterContext *filter = graph->filters[i];
462
463         for (j = 0; j < filter->nb_inputs; j++) {
464             AVFilterLink *link = filter->inputs[j];
465             int convert_needed = 0;
466
467             if (!link)
468                 continue;
469
470             if (link->in_formats != link->out_formats
471                 && link->in_formats && link->out_formats)
472                 if (!can_merge_formats(link->in_formats, link->out_formats,
473                                       link->type, 0))
474                     convert_needed = 1;
475             if (link->type == AVMEDIA_TYPE_AUDIO) {
476                 if (link->in_samplerates != link->out_samplerates
477                     && link->in_samplerates && link->out_samplerates)
478                     if (!can_merge_formats(link->in_samplerates,
479                                            link->out_samplerates,
480                                            0, 1))
481                         convert_needed = 1;
482             }
483
484 #define MERGE_DISPATCH(field, statement)                                     \
485             if (!(link->in_ ## field && link->out_ ## field)) {              \
486                 count_delayed++;                                             \
487             } else if (link->in_ ## field == link->out_ ## field) {          \
488                 count_already_merged++;                                      \
489             } else if (!convert_needed) {                                    \
490                 count_merged++;                                              \
491                 statement                                                    \
492             }
493
494             if (link->type == AVMEDIA_TYPE_AUDIO) {
495                 MERGE_DISPATCH(channel_layouts,
496                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
497                                                   link->out_channel_layouts))
498                         convert_needed = 1;
499                 )
500                 MERGE_DISPATCH(samplerates,
501                     if (!ff_merge_samplerates(link->in_samplerates,
502                                               link->out_samplerates))
503                         convert_needed = 1;
504                 )
505             }
506             MERGE_DISPATCH(formats,
507                 if (!ff_merge_formats(link->in_formats, link->out_formats,
508                                       link->type))
509                     convert_needed = 1;
510             )
511 #undef MERGE_DISPATCH
512
513             if (convert_needed) {
514                 AVFilterContext *convert;
515                 AVFilter *filter;
516                 AVFilterLink *inlink, *outlink;
517                 char scale_args[256];
518                 char inst_name[30];
519
520                 /* couldn't merge format lists. auto-insert conversion filter */
521                 switch (link->type) {
522                 case AVMEDIA_TYPE_VIDEO:
523                     if (!(filter = avfilter_get_by_name("scale"))) {
524                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
525                                "not present, cannot convert pixel formats.\n");
526                         return AVERROR(EINVAL);
527                     }
528
529                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
530                              scaler_count++);
531
532                     if ((ret = avfilter_graph_create_filter(&convert, filter,
533                                                             inst_name, graph->scale_sws_opts, NULL,
534                                                             graph)) < 0)
535                         return ret;
536                     break;
537                 case AVMEDIA_TYPE_AUDIO:
538                     if (!(filter = avfilter_get_by_name("aresample"))) {
539                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
540                                "not present, cannot convert audio formats.\n");
541                         return AVERROR(EINVAL);
542                     }
543
544                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
545                              resampler_count++);
546                     scale_args[0] = '\0';
547                     if (graph->aresample_swr_opts)
548                         snprintf(scale_args, sizeof(scale_args), "%s",
549                                  graph->aresample_swr_opts);
550                     if ((ret = avfilter_graph_create_filter(&convert, filter,
551                                                             inst_name, graph->aresample_swr_opts,
552                                                             NULL, graph)) < 0)
553                         return ret;
554                     break;
555                 default:
556                     return AVERROR(EINVAL);
557                 }
558
559                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
560                     return ret;
561
562                 if ((ret = filter_query_formats(convert)) < 0)
563                     return ret;
564
565                 inlink  = convert->inputs[0];
566                 outlink = convert->outputs[0];
567                 av_assert0( inlink-> in_formats->refcount > 0);
568                 av_assert0( inlink->out_formats->refcount > 0);
569                 av_assert0(outlink-> in_formats->refcount > 0);
570                 av_assert0(outlink->out_formats->refcount > 0);
571                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
572                     av_assert0( inlink-> in_samplerates->refcount > 0);
573                     av_assert0( inlink->out_samplerates->refcount > 0);
574                     av_assert0(outlink-> in_samplerates->refcount > 0);
575                     av_assert0(outlink->out_samplerates->refcount > 0);
576                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
577                     av_assert0( inlink->out_channel_layouts->refcount > 0);
578                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
579                     av_assert0(outlink->out_channel_layouts->refcount > 0);
580                 }
581                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
582                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
583                     ret = AVERROR(ENOSYS);
584                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
585                     (!ff_merge_samplerates(inlink->in_samplerates,
586                                            inlink->out_samplerates) ||
587                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
588                                                inlink->out_channel_layouts)))
589                     ret = AVERROR(ENOSYS);
590                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
591                     (!ff_merge_samplerates(outlink->in_samplerates,
592                                            outlink->out_samplerates) ||
593                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
594                                                outlink->out_channel_layouts)))
595                     ret = AVERROR(ENOSYS);
596
597                 if (ret < 0) {
598                     av_log(log_ctx, AV_LOG_ERROR,
599                            "Impossible to convert between the formats supported by the filter "
600                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
601                     return ret;
602                 }
603             }
604         }
605     }
606
607     av_log(graph, AV_LOG_DEBUG, "query_formats: "
608            "%d queried, %d merged, %d already done, %d delayed\n",
609            count_queried, count_merged, count_already_merged, count_delayed);
610     if (count_delayed) {
611         AVBPrint bp;
612
613         /* if count_queried > 0, one filter at least did set its formats,
614            that will give additional information to its neighbour;
615            if count_merged > 0, one pair of formats lists at least was merged,
616            that will give additional information to all connected filters;
617            in both cases, progress was made and a new round must be done */
618         if (count_queried || count_merged)
619             return AVERROR(EAGAIN);
620         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
621         for (i = 0; i < graph->nb_filters; i++)
622             if (!formats_declared(graph->filters[i]))
623                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
624                           graph->filters[i]->name);
625         av_log(graph, AV_LOG_ERROR,
626                "The following filters could not choose their formats: %s\n"
627                "Consider inserting the (a)format filter near their input or "
628                "output.\n", bp.str);
629         return AVERROR(EIO);
630     }
631     return 0;
632 }
633
634 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
635 {
636     if (!link || !link->in_formats)
637         return 0;
638
639     if (link->type == AVMEDIA_TYPE_VIDEO) {
640         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
641             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
642             enum AVPixelFormat best= AV_PIX_FMT_NONE;
643             int i;
644             for (i=0; i<link->in_formats->nb_formats; i++) {
645                 enum AVPixelFormat p = link->in_formats->formats[i];
646                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
647             }
648             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
649                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
650                    av_get_pix_fmt_name(ref->format), has_alpha);
651             link->in_formats->formats[0] = best;
652         }
653     }
654
655     link->in_formats->nb_formats = 1;
656     link->format = link->in_formats->formats[0];
657
658     if (link->type == AVMEDIA_TYPE_AUDIO) {
659         if (!link->in_samplerates->nb_formats) {
660             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
661                    " the link between filters %s and %s.\n", link->src->name,
662                    link->dst->name);
663             return AVERROR(EINVAL);
664         }
665         link->in_samplerates->nb_formats = 1;
666         link->sample_rate = link->in_samplerates->formats[0];
667
668         if (link->in_channel_layouts->all_layouts) {
669             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
670                    " the link between filters %s and %s.\n", link->src->name,
671                    link->dst->name);
672             if (!link->in_channel_layouts->all_counts)
673                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
674                        "supported, try specifying a channel layout using "
675                        "'aformat=channel_layouts=something'.\n");
676             return AVERROR(EINVAL);
677         }
678         link->in_channel_layouts->nb_channel_layouts = 1;
679         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
680         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
681             link->channel_layout = 0;
682         else
683             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
684     }
685
686     ff_formats_unref(&link->in_formats);
687     ff_formats_unref(&link->out_formats);
688     ff_formats_unref(&link->in_samplerates);
689     ff_formats_unref(&link->out_samplerates);
690     ff_channel_layouts_unref(&link->in_channel_layouts);
691     ff_channel_layouts_unref(&link->out_channel_layouts);
692
693     return 0;
694 }
695
696 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
697 do {                                                                   \
698     for (i = 0; i < filter->nb_inputs; i++) {                          \
699         AVFilterLink *link = filter->inputs[i];                        \
700         fmt_type fmt;                                                  \
701                                                                        \
702         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
703             continue;                                                  \
704         fmt = link->out_ ## list->var[0];                              \
705                                                                        \
706         for (j = 0; j < filter->nb_outputs; j++) {                     \
707             AVFilterLink *out_link = filter->outputs[j];               \
708             list_type *fmts;                                           \
709                                                                        \
710             if (link->type != out_link->type ||                        \
711                 out_link->in_ ## list->nb == 1)                        \
712                 continue;                                              \
713             fmts = out_link->in_ ## list;                              \
714                                                                        \
715             if (!out_link->in_ ## list->nb) {                          \
716                 add_format(&out_link->in_ ##list, fmt);                \
717                 ret = 1;                                               \
718                 break;                                                 \
719             }                                                          \
720                                                                        \
721             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
722                 if (fmts->var[k] == fmt) {                             \
723                     fmts->var[0]  = fmt;                               \
724                     fmts->nb = 1;                                      \
725                     ret = 1;                                           \
726                     break;                                             \
727                 }                                                      \
728         }                                                              \
729     }                                                                  \
730 } while (0)
731
732 static int reduce_formats_on_filter(AVFilterContext *filter)
733 {
734     int i, j, k, ret = 0;
735
736     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
737                    nb_formats, ff_add_format);
738     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
739                    nb_formats, ff_add_format);
740
741     /* reduce channel layouts */
742     for (i = 0; i < filter->nb_inputs; i++) {
743         AVFilterLink *inlink = filter->inputs[i];
744         uint64_t fmt;
745
746         if (!inlink->out_channel_layouts ||
747             inlink->out_channel_layouts->nb_channel_layouts != 1)
748             continue;
749         fmt = inlink->out_channel_layouts->channel_layouts[0];
750
751         for (j = 0; j < filter->nb_outputs; j++) {
752             AVFilterLink *outlink = filter->outputs[j];
753             AVFilterChannelLayouts *fmts;
754
755             fmts = outlink->in_channel_layouts;
756             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
757                 continue;
758
759             if (fmts->all_layouts &&
760                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
761                 /* Turn the infinite list into a singleton */
762                 fmts->all_layouts = fmts->all_counts  = 0;
763                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
764                 break;
765             }
766
767             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
768                 if (fmts->channel_layouts[k] == fmt) {
769                     fmts->channel_layouts[0]  = fmt;
770                     fmts->nb_channel_layouts = 1;
771                     ret = 1;
772                     break;
773                 }
774             }
775         }
776     }
777
778     return ret;
779 }
780
781 static void reduce_formats(AVFilterGraph *graph)
782 {
783     int i, reduced;
784
785     do {
786         reduced = 0;
787
788         for (i = 0; i < graph->nb_filters; i++)
789             reduced |= reduce_formats_on_filter(graph->filters[i]);
790     } while (reduced);
791 }
792
793 static void swap_samplerates_on_filter(AVFilterContext *filter)
794 {
795     AVFilterLink *link = NULL;
796     int sample_rate;
797     int i, j;
798
799     for (i = 0; i < filter->nb_inputs; i++) {
800         link = filter->inputs[i];
801
802         if (link->type == AVMEDIA_TYPE_AUDIO &&
803             link->out_samplerates->nb_formats== 1)
804             break;
805     }
806     if (i == filter->nb_inputs)
807         return;
808
809     sample_rate = link->out_samplerates->formats[0];
810
811     for (i = 0; i < filter->nb_outputs; i++) {
812         AVFilterLink *outlink = filter->outputs[i];
813         int best_idx, best_diff = INT_MAX;
814
815         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
816             outlink->in_samplerates->nb_formats < 2)
817             continue;
818
819         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
820             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
821
822             if (diff < best_diff) {
823                 best_diff = diff;
824                 best_idx  = j;
825             }
826         }
827         FFSWAP(int, outlink->in_samplerates->formats[0],
828                outlink->in_samplerates->formats[best_idx]);
829     }
830 }
831
832 static void swap_samplerates(AVFilterGraph *graph)
833 {
834     int i;
835
836     for (i = 0; i < graph->nb_filters; i++)
837         swap_samplerates_on_filter(graph->filters[i]);
838 }
839
840 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
841 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
842 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
843 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
844 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
845 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
846 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
847
848 /* allowable substitutions for channel pairs when comparing layouts,
849  * ordered by priority for both values */
850 static const uint64_t ch_subst[][2] = {
851     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
852     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
853     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
854     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
855     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
856     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
857     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
858     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
859     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
860     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
861     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
862     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
863     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
864     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
865     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
866     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
867     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
868     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
869     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
870     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
871     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
872 };
873
874 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
875 {
876     AVFilterLink *link = NULL;
877     int i, j, k;
878
879     for (i = 0; i < filter->nb_inputs; i++) {
880         link = filter->inputs[i];
881
882         if (link->type == AVMEDIA_TYPE_AUDIO &&
883             link->out_channel_layouts->nb_channel_layouts == 1)
884             break;
885     }
886     if (i == filter->nb_inputs)
887         return;
888
889     for (i = 0; i < filter->nb_outputs; i++) {
890         AVFilterLink *outlink = filter->outputs[i];
891         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
892
893         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
894             outlink->in_channel_layouts->nb_channel_layouts < 2)
895             continue;
896
897         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
898             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
899             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
900             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
901             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
902             int count_diff        = out_channels - in_channels;
903             int matched_channels, extra_channels;
904             int score = 100000;
905
906             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
907                 /* Compute score in case the input or output layout encodes
908                    a channel count; in this case the score is not altered by
909                    the computation afterwards, as in_chlayout and
910                    out_chlayout have both been set to 0 */
911                 if (FF_LAYOUT2COUNT(in_chlayout))
912                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
913                 if (FF_LAYOUT2COUNT(out_chlayout))
914                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
915                 score -= 10000 + FFABS(out_channels - in_channels) +
916                          (in_channels > out_channels ? 10000 : 0);
917                 in_chlayout = out_chlayout = 0;
918                 /* Let the remaining computation run, even if the score
919                    value is not altered */
920             }
921
922             /* channel substitution */
923             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
924                 uint64_t cmp0 = ch_subst[k][0];
925                 uint64_t cmp1 = ch_subst[k][1];
926                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
927                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
928                     in_chlayout  &= ~cmp0;
929                     out_chlayout &= ~cmp1;
930                     /* add score for channel match, minus a deduction for
931                        having to do the substitution */
932                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
933                 }
934             }
935
936             /* no penalty for LFE channel mismatch */
937             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
938                 (out_chlayout & AV_CH_LOW_FREQUENCY))
939                 score += 10;
940             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
941             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
942
943             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
944                                                                  out_chlayout);
945             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
946                                                                  (~in_chlayout));
947             score += 10 * matched_channels - 5 * extra_channels;
948
949             if (score > best_score ||
950                 (count_diff < best_count_diff && score == best_score)) {
951                 best_score = score;
952                 best_idx   = j;
953                 best_count_diff = count_diff;
954             }
955         }
956         av_assert0(best_idx >= 0);
957         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
958                outlink->in_channel_layouts->channel_layouts[best_idx]);
959     }
960
961 }
962
963 static void swap_channel_layouts(AVFilterGraph *graph)
964 {
965     int i;
966
967     for (i = 0; i < graph->nb_filters; i++)
968         swap_channel_layouts_on_filter(graph->filters[i]);
969 }
970
971 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
972 {
973     AVFilterLink *link = NULL;
974     int format, bps;
975     int i, j;
976
977     for (i = 0; i < filter->nb_inputs; i++) {
978         link = filter->inputs[i];
979
980         if (link->type == AVMEDIA_TYPE_AUDIO &&
981             link->out_formats->nb_formats == 1)
982             break;
983     }
984     if (i == filter->nb_inputs)
985         return;
986
987     format = link->out_formats->formats[0];
988     bps    = av_get_bytes_per_sample(format);
989
990     for (i = 0; i < filter->nb_outputs; i++) {
991         AVFilterLink *outlink = filter->outputs[i];
992         int best_idx = -1, best_score = INT_MIN;
993
994         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
995             outlink->in_formats->nb_formats < 2)
996             continue;
997
998         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
999             int out_format = outlink->in_formats->formats[j];
1000             int out_bps    = av_get_bytes_per_sample(out_format);
1001             int score;
1002
1003             if (av_get_packed_sample_fmt(out_format) == format ||
1004                 av_get_planar_sample_fmt(out_format) == format) {
1005                 best_idx   = j;
1006                 break;
1007             }
1008
1009             /* for s32 and float prefer double to prevent loss of information */
1010             if (bps == 4 && out_bps == 8) {
1011                 best_idx = j;
1012                 break;
1013             }
1014
1015             /* prefer closest higher or equal bps */
1016             score = -abs(out_bps - bps);
1017             if (out_bps >= bps)
1018                 score += INT_MAX/2;
1019
1020             if (score > best_score) {
1021                 best_score = score;
1022                 best_idx   = j;
1023             }
1024         }
1025         av_assert0(best_idx >= 0);
1026         FFSWAP(int, outlink->in_formats->formats[0],
1027                outlink->in_formats->formats[best_idx]);
1028     }
1029 }
1030
1031 static void swap_sample_fmts(AVFilterGraph *graph)
1032 {
1033     int i;
1034
1035     for (i = 0; i < graph->nb_filters; i++)
1036         swap_sample_fmts_on_filter(graph->filters[i]);
1037
1038 }
1039
1040 static int pick_formats(AVFilterGraph *graph)
1041 {
1042     int i, j, ret;
1043     int change;
1044
1045     do{
1046         change = 0;
1047         for (i = 0; i < graph->nb_filters; i++) {
1048             AVFilterContext *filter = graph->filters[i];
1049             if (filter->nb_inputs){
1050                 for (j = 0; j < filter->nb_inputs; j++){
1051                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1052                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1053                             return ret;
1054                         change = 1;
1055                     }
1056                 }
1057             }
1058             if (filter->nb_outputs){
1059                 for (j = 0; j < filter->nb_outputs; j++){
1060                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1061                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1062                             return ret;
1063                         change = 1;
1064                     }
1065                 }
1066             }
1067             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1068                 for (j = 0; j < filter->nb_outputs; j++) {
1069                     if(filter->outputs[j]->format<0) {
1070                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1071                             return ret;
1072                         change = 1;
1073                     }
1074                 }
1075             }
1076         }
1077     }while(change);
1078
1079     for (i = 0; i < graph->nb_filters; i++) {
1080         AVFilterContext *filter = graph->filters[i];
1081
1082         for (j = 0; j < filter->nb_inputs; j++)
1083             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1084                 return ret;
1085         for (j = 0; j < filter->nb_outputs; j++)
1086             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1087                 return ret;
1088     }
1089     return 0;
1090 }
1091
1092 /**
1093  * Configure the formats of all the links in the graph.
1094  */
1095 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1096 {
1097     int ret;
1098
1099     /* find supported formats from sub-filters, and merge along links */
1100     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1101         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1102     if (ret < 0)
1103         return ret;
1104
1105     /* Once everything is merged, it's possible that we'll still have
1106      * multiple valid media format choices. We try to minimize the amount
1107      * of format conversion inside filters */
1108     reduce_formats(graph);
1109
1110     /* for audio filters, ensure the best format, sample rate and channel layout
1111      * is selected */
1112     swap_sample_fmts(graph);
1113     swap_samplerates(graph);
1114     swap_channel_layouts(graph);
1115
1116     if ((ret = pick_formats(graph)) < 0)
1117         return ret;
1118
1119     return 0;
1120 }
1121
1122 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
1123                                              AVClass *log_ctx)
1124 {
1125     unsigned i, j;
1126     int sink_links_count = 0, n = 0;
1127     AVFilterContext *f;
1128     AVFilterLink **sinks;
1129
1130     for (i = 0; i < graph->nb_filters; i++) {
1131         f = graph->filters[i];
1132         for (j = 0; j < f->nb_inputs; j++) {
1133             f->inputs[j]->graph     = graph;
1134             f->inputs[j]->age_index = -1;
1135         }
1136         for (j = 0; j < f->nb_outputs; j++) {
1137             f->outputs[j]->graph    = graph;
1138             f->outputs[j]->age_index= -1;
1139         }
1140         if (!f->nb_outputs) {
1141             if (f->nb_inputs > INT_MAX - sink_links_count)
1142                 return AVERROR(EINVAL);
1143             sink_links_count += f->nb_inputs;
1144         }
1145     }
1146     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1147     if (!sinks)
1148         return AVERROR(ENOMEM);
1149     for (i = 0; i < graph->nb_filters; i++) {
1150         f = graph->filters[i];
1151         if (!f->nb_outputs) {
1152             for (j = 0; j < f->nb_inputs; j++) {
1153                 sinks[n] = f->inputs[j];
1154                 f->inputs[j]->age_index = n++;
1155             }
1156         }
1157     }
1158     av_assert0(n == sink_links_count);
1159     graph->sink_links       = sinks;
1160     graph->sink_links_count = sink_links_count;
1161     return 0;
1162 }
1163
1164 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1165 {
1166     AVFilterContext *f;
1167     int i, j, ret;
1168     int fifo_count = 0;
1169
1170     for (i = 0; i < graph->nb_filters; i++) {
1171         f = graph->filters[i];
1172
1173         for (j = 0; j < f->nb_inputs; j++) {
1174             AVFilterLink *link = f->inputs[j];
1175             AVFilterContext *fifo_ctx;
1176             AVFilter *fifo;
1177             char name[32];
1178
1179             if (!link->dstpad->needs_fifo)
1180                 continue;
1181
1182             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1183                    avfilter_get_by_name("fifo") :
1184                    avfilter_get_by_name("afifo");
1185
1186             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1187
1188             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1189                                                NULL, graph);
1190             if (ret < 0)
1191                 return ret;
1192
1193             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1194             if (ret < 0)
1195                 return ret;
1196         }
1197     }
1198
1199     return 0;
1200 }
1201
1202 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1203 {
1204     int ret;
1205
1206     if ((ret = graph_check_validity(graphctx, log_ctx)))
1207         return ret;
1208     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1209         return ret;
1210     if ((ret = graph_config_formats(graphctx, log_ctx)))
1211         return ret;
1212     if ((ret = graph_config_links(graphctx, log_ctx)))
1213         return ret;
1214     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1215         return ret;
1216
1217     return 0;
1218 }
1219
1220 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1221 {
1222     int i, r = AVERROR(ENOSYS);
1223
1224     if (!graph)
1225         return r;
1226
1227     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1228         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1229         if (r != AVERROR(ENOSYS))
1230             return r;
1231     }
1232
1233     if (res_len && res)
1234         res[0] = 0;
1235
1236     for (i = 0; i < graph->nb_filters; i++) {
1237         AVFilterContext *filter = graph->filters[i];
1238         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1239             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1240             if (r != AVERROR(ENOSYS)) {
1241                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1242                     return r;
1243             }
1244         }
1245     }
1246
1247     return r;
1248 }
1249
1250 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1251 {
1252     int i;
1253
1254     if(!graph)
1255         return 0;
1256
1257     for (i = 0; i < graph->nb_filters; i++) {
1258         AVFilterContext *filter = graph->filters[i];
1259         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1260             AVFilterCommand **queue = &filter->command_queue, *next;
1261             while (*queue && (*queue)->time <= ts)
1262                 queue = &(*queue)->next;
1263             next = *queue;
1264             *queue = av_mallocz(sizeof(AVFilterCommand));
1265             (*queue)->command = av_strdup(command);
1266             (*queue)->arg     = av_strdup(arg);
1267             (*queue)->time    = ts;
1268             (*queue)->flags   = flags;
1269             (*queue)->next    = next;
1270             if(flags & AVFILTER_CMD_FLAG_ONE)
1271                 return 0;
1272         }
1273     }
1274
1275     return 0;
1276 }
1277
1278 static void heap_bubble_up(AVFilterGraph *graph,
1279                            AVFilterLink *link, int index)
1280 {
1281     AVFilterLink **links = graph->sink_links;
1282
1283     av_assert0(index >= 0);
1284
1285     while (index) {
1286         int parent = (index - 1) >> 1;
1287         if (links[parent]->current_pts >= link->current_pts)
1288             break;
1289         links[index] = links[parent];
1290         links[index]->age_index = index;
1291         index = parent;
1292     }
1293     links[index] = link;
1294     link->age_index = index;
1295 }
1296
1297 static void heap_bubble_down(AVFilterGraph *graph,
1298                              AVFilterLink *link, int index)
1299 {
1300     AVFilterLink **links = graph->sink_links;
1301
1302     av_assert0(index >= 0);
1303
1304     while (1) {
1305         int child = 2 * index + 1;
1306         if (child >= graph->sink_links_count)
1307             break;
1308         if (child + 1 < graph->sink_links_count &&
1309             links[child + 1]->current_pts < links[child]->current_pts)
1310             child++;
1311         if (link->current_pts < links[child]->current_pts)
1312             break;
1313         links[index] = links[child];
1314         links[index]->age_index = index;
1315         index = child;
1316     }
1317     links[index] = link;
1318     link->age_index = index;
1319 }
1320
1321 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1322 {
1323     heap_bubble_up  (graph, link, link->age_index);
1324     heap_bubble_down(graph, link, link->age_index);
1325 }
1326
1327
1328 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1329 {
1330     while (graph->sink_links_count) {
1331         AVFilterLink *oldest = graph->sink_links[0];
1332         int r = ff_request_frame(oldest);
1333         if (r != AVERROR_EOF)
1334             return r;
1335         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1336                oldest->dst ? oldest->dst->name : "unknown",
1337                oldest->dstpad ? oldest->dstpad->name : "unknown");
1338         /* EOF: remove the link from the heap */
1339         if (oldest->age_index < --graph->sink_links_count)
1340             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1341                              oldest->age_index);
1342         oldest->age_index = -1;
1343     }
1344     return AVERROR_EOF;
1345 }