Merge commit '96a47364d1cf346a5d0437e054b1b10d44d8d969'
[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 #define FF_INTERNAL_FIELDS 1
36 #include "framequeue.h"
37
38 #include "avfilter.h"
39 #include "buffersink.h"
40 #include "formats.h"
41 #include "internal.h"
42 #include "thread.h"
43
44 #define OFFSET(x) offsetof(AVFilterGraph, x)
45 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
46 static const AVOption filtergraph_options[] = {
47     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
48         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
49         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
50     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
51         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
52     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
53         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
54     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
55         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
56     { NULL },
57 };
58
59 static const AVClass filtergraph_class = {
60     .class_name = "AVFilterGraph",
61     .item_name  = av_default_item_name,
62     .version    = LIBAVUTIL_VERSION_INT,
63     .option     = filtergraph_options,
64     .category   = AV_CLASS_CATEGORY_FILTER,
65 };
66
67 #if !HAVE_THREADS
68 void ff_graph_thread_free(AVFilterGraph *graph)
69 {
70 }
71
72 int ff_graph_thread_init(AVFilterGraph *graph)
73 {
74     graph->thread_type = 0;
75     graph->nb_threads  = 1;
76     return 0;
77 }
78 #endif
79
80 AVFilterGraph *avfilter_graph_alloc(void)
81 {
82     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
83     if (!ret)
84         return NULL;
85
86     ret->internal = av_mallocz(sizeof(*ret->internal));
87     if (!ret->internal) {
88         av_freep(&ret);
89         return NULL;
90     }
91
92     ret->av_class = &filtergraph_class;
93     av_opt_set_defaults(ret);
94     ff_framequeue_global_init(&ret->internal->frame_queues);
95
96     return ret;
97 }
98
99 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
100 {
101     int i, j;
102     for (i = 0; i < graph->nb_filters; i++) {
103         if (graph->filters[i] == filter) {
104             FFSWAP(AVFilterContext*, graph->filters[i],
105                    graph->filters[graph->nb_filters - 1]);
106             graph->nb_filters--;
107             filter->graph = NULL;
108             for (j = 0; j<filter->nb_outputs; j++)
109                 if (filter->outputs[j])
110                     filter->outputs[j]->graph = NULL;
111
112             return;
113         }
114     }
115 }
116
117 void avfilter_graph_free(AVFilterGraph **graph)
118 {
119     if (!*graph)
120         return;
121
122     while ((*graph)->nb_filters)
123         avfilter_free((*graph)->filters[0]);
124
125     ff_graph_thread_free(*graph);
126
127     av_freep(&(*graph)->sink_links);
128
129     av_freep(&(*graph)->scale_sws_opts);
130     av_freep(&(*graph)->aresample_swr_opts);
131 #if FF_API_LAVR_OPTS
132     av_freep(&(*graph)->resample_lavr_opts);
133 #endif
134     av_freep(&(*graph)->filters);
135     av_freep(&(*graph)->internal);
136     av_freep(graph);
137 }
138
139 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
140                                  const char *name, const char *args, void *opaque,
141                                  AVFilterGraph *graph_ctx)
142 {
143     int ret;
144
145     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
146     if (!*filt_ctx)
147         return AVERROR(ENOMEM);
148
149     ret = avfilter_init_str(*filt_ctx, args);
150     if (ret < 0)
151         goto fail;
152
153     return 0;
154
155 fail:
156     if (*filt_ctx)
157         avfilter_free(*filt_ctx);
158     *filt_ctx = NULL;
159     return ret;
160 }
161
162 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
163 {
164     graph->disable_auto_convert = flags;
165 }
166
167 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
168                                              const AVFilter *filter,
169                                              const char *name)
170 {
171     AVFilterContext **filters, *s;
172
173     if (graph->thread_type && !graph->internal->thread_execute) {
174         if (graph->execute) {
175             graph->internal->thread_execute = graph->execute;
176         } else {
177             int ret = ff_graph_thread_init(graph);
178             if (ret < 0) {
179                 av_log(graph, AV_LOG_ERROR, "Error initializing threading: %s.\n", av_err2str(ret));
180                 return NULL;
181             }
182         }
183     }
184
185     s = ff_filter_alloc(filter, name);
186     if (!s)
187         return NULL;
188
189     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
190     if (!filters) {
191         avfilter_free(s);
192         return NULL;
193     }
194
195     graph->filters = filters;
196     graph->filters[graph->nb_filters++] = s;
197
198     s->graph = graph;
199
200     return s;
201 }
202
203 /**
204  * Check for the validity of graph.
205  *
206  * A graph is considered valid if all its input and output pads are
207  * connected.
208  *
209  * @return >= 0 in case of success, a negative value otherwise
210  */
211 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
212 {
213     AVFilterContext *filt;
214     int i, j;
215
216     for (i = 0; i < graph->nb_filters; i++) {
217         const AVFilterPad *pad;
218         filt = graph->filters[i];
219
220         for (j = 0; j < filt->nb_inputs; j++) {
221             if (!filt->inputs[j] || !filt->inputs[j]->src) {
222                 pad = &filt->input_pads[j];
223                 av_log(log_ctx, AV_LOG_ERROR,
224                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
225                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
226                 return AVERROR(EINVAL);
227             }
228         }
229
230         for (j = 0; j < filt->nb_outputs; j++) {
231             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
232                 pad = &filt->output_pads[j];
233                 av_log(log_ctx, AV_LOG_ERROR,
234                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
235                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
236                 return AVERROR(EINVAL);
237             }
238         }
239     }
240
241     return 0;
242 }
243
244 /**
245  * Configure all the links of graphctx.
246  *
247  * @return >= 0 in case of success, a negative value otherwise
248  */
249 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
250 {
251     AVFilterContext *filt;
252     int i, ret;
253
254     for (i = 0; i < graph->nb_filters; i++) {
255         filt = graph->filters[i];
256
257         if (!filt->nb_outputs) {
258             if ((ret = avfilter_config_links(filt)))
259                 return ret;
260         }
261     }
262
263     return 0;
264 }
265
266 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
267 {
268     int i;
269
270     for (i = 0; i < graph->nb_filters; i++)
271         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
272             return graph->filters[i];
273
274     return NULL;
275 }
276
277 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
278 {
279     if (!l)
280         return;
281     if (l->nb_channel_layouts) {
282         if (l->all_layouts || l->all_counts)
283             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
284         l->all_layouts = l->all_counts = 0;
285     } else {
286         if (l->all_counts && !l->all_layouts)
287             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
288         l->all_layouts = 1;
289     }
290 }
291
292 static int filter_query_formats(AVFilterContext *ctx)
293 {
294     int ret, i;
295     AVFilterFormats *formats;
296     AVFilterChannelLayouts *chlayouts;
297     AVFilterFormats *samplerates;
298     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
299                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
300                             AVMEDIA_TYPE_VIDEO;
301
302     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
303         if (ret != AVERROR(EAGAIN))
304             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
305                    ctx->name, av_err2str(ret));
306         return ret;
307     }
308
309     for (i = 0; i < ctx->nb_inputs; i++)
310         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
311     for (i = 0; i < ctx->nb_outputs; i++)
312         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
313
314     formats = ff_all_formats(type);
315     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
316         return ret;
317     if (type == AVMEDIA_TYPE_AUDIO) {
318         samplerates = ff_all_samplerates();
319         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
320             return ret;
321         chlayouts = ff_all_channel_layouts();
322         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
323             return ret;
324     }
325     return 0;
326 }
327
328 static int formats_declared(AVFilterContext *f)
329 {
330     int i;
331
332     for (i = 0; i < f->nb_inputs; i++) {
333         if (!f->inputs[i]->out_formats)
334             return 0;
335         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
336             !(f->inputs[i]->out_samplerates &&
337               f->inputs[i]->out_channel_layouts))
338             return 0;
339     }
340     for (i = 0; i < f->nb_outputs; i++) {
341         if (!f->outputs[i]->in_formats)
342             return 0;
343         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
344             !(f->outputs[i]->in_samplerates &&
345               f->outputs[i]->in_channel_layouts))
346             return 0;
347     }
348     return 1;
349 }
350
351 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
352 {
353     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
354     if (a) {
355         a->refcount = 0;
356         a->refs     = NULL;
357         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
358         if (!a->formats && arg->formats)
359             av_freep(&a);
360     }
361     return a;
362 }
363
364 static int can_merge_formats(AVFilterFormats *a_arg,
365                              AVFilterFormats *b_arg,
366                              enum AVMediaType type,
367                              int is_sample_rate)
368 {
369     AVFilterFormats *a, *b, *ret;
370     if (a_arg == b_arg)
371         return 1;
372     a = clone_filter_formats(a_arg);
373     b = clone_filter_formats(b_arg);
374
375     if (!a || !b) {
376         if (a)
377             av_freep(&a->formats);
378         if (b)
379             av_freep(&b->formats);
380
381         av_freep(&a);
382         av_freep(&b);
383
384         return 0;
385     }
386
387     if (is_sample_rate) {
388         ret = ff_merge_samplerates(a, b);
389     } else {
390         ret = ff_merge_formats(a, b, type);
391     }
392     if (ret) {
393         av_freep(&ret->formats);
394         av_freep(&ret->refs);
395         av_freep(&ret);
396         return 1;
397     } else {
398         av_freep(&a->formats);
399         av_freep(&b->formats);
400         av_freep(&a);
401         av_freep(&b);
402         return 0;
403     }
404 }
405
406 /**
407  * Perform one round of query_formats() and merging formats lists on the
408  * filter graph.
409  * @return  >=0 if all links formats lists could be queried and merged;
410  *          AVERROR(EAGAIN) some progress was made in the queries or merging
411  *          and a later call may succeed;
412  *          AVERROR(EIO) (may be changed) plus a log message if no progress
413  *          was made and the negotiation is stuck;
414  *          a negative error code if some other error happened
415  */
416 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
417 {
418     int i, j, ret;
419     int scaler_count = 0, resampler_count = 0;
420     int count_queried = 0;        /* successful calls to query_formats() */
421     int count_merged = 0;         /* successful merge of formats lists */
422     int count_already_merged = 0; /* lists already merged */
423     int count_delayed = 0;        /* lists that need to be merged later */
424
425     for (i = 0; i < graph->nb_filters; i++) {
426         AVFilterContext *f = graph->filters[i];
427         if (formats_declared(f))
428             continue;
429         if (f->filter->query_formats)
430             ret = filter_query_formats(f);
431         else
432             ret = ff_default_query_formats(f);
433         if (ret < 0 && ret != AVERROR(EAGAIN))
434             return ret;
435         /* note: EAGAIN could indicate a partial success, not counted yet */
436         count_queried += ret >= 0;
437     }
438
439     /* go through and merge as many format lists as possible */
440     for (i = 0; i < graph->nb_filters; i++) {
441         AVFilterContext *filter = graph->filters[i];
442
443         for (j = 0; j < filter->nb_inputs; j++) {
444             AVFilterLink *link = filter->inputs[j];
445             int convert_needed = 0;
446
447             if (!link)
448                 continue;
449
450             if (link->in_formats != link->out_formats
451                 && link->in_formats && link->out_formats)
452                 if (!can_merge_formats(link->in_formats, link->out_formats,
453                                       link->type, 0))
454                     convert_needed = 1;
455             if (link->type == AVMEDIA_TYPE_AUDIO) {
456                 if (link->in_samplerates != link->out_samplerates
457                     && link->in_samplerates && link->out_samplerates)
458                     if (!can_merge_formats(link->in_samplerates,
459                                            link->out_samplerates,
460                                            0, 1))
461                         convert_needed = 1;
462             }
463
464 #define MERGE_DISPATCH(field, statement)                                     \
465             if (!(link->in_ ## field && link->out_ ## field)) {              \
466                 count_delayed++;                                             \
467             } else if (link->in_ ## field == link->out_ ## field) {          \
468                 count_already_merged++;                                      \
469             } else if (!convert_needed) {                                    \
470                 count_merged++;                                              \
471                 statement                                                    \
472             }
473
474             if (link->type == AVMEDIA_TYPE_AUDIO) {
475                 MERGE_DISPATCH(channel_layouts,
476                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
477                                                   link->out_channel_layouts))
478                         convert_needed = 1;
479                 )
480                 MERGE_DISPATCH(samplerates,
481                     if (!ff_merge_samplerates(link->in_samplerates,
482                                               link->out_samplerates))
483                         convert_needed = 1;
484                 )
485             }
486             MERGE_DISPATCH(formats,
487                 if (!ff_merge_formats(link->in_formats, link->out_formats,
488                                       link->type))
489                     convert_needed = 1;
490             )
491 #undef MERGE_DISPATCH
492
493             if (convert_needed) {
494                 AVFilterContext *convert;
495                 const AVFilter *filter;
496                 AVFilterLink *inlink, *outlink;
497                 char scale_args[256];
498                 char inst_name[30];
499
500                 if (graph->disable_auto_convert) {
501                     av_log(log_ctx, AV_LOG_ERROR,
502                            "The filters '%s' and '%s' do not have a common format "
503                            "and automatic conversion is disabled.\n",
504                            link->src->name, link->dst->name);
505                     return AVERROR(EINVAL);
506                 }
507
508                 /* couldn't merge format lists. auto-insert conversion filter */
509                 switch (link->type) {
510                 case AVMEDIA_TYPE_VIDEO:
511                     if (!(filter = avfilter_get_by_name("scale"))) {
512                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
513                                "not present, cannot convert pixel formats.\n");
514                         return AVERROR(EINVAL);
515                     }
516
517                     snprintf(inst_name, sizeof(inst_name), "auto_scaler_%d",
518                              scaler_count++);
519
520                     if ((ret = avfilter_graph_create_filter(&convert, filter,
521                                                             inst_name, graph->scale_sws_opts, NULL,
522                                                             graph)) < 0)
523                         return ret;
524                     break;
525                 case AVMEDIA_TYPE_AUDIO:
526                     if (!(filter = avfilter_get_by_name("aresample"))) {
527                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
528                                "not present, cannot convert audio formats.\n");
529                         return AVERROR(EINVAL);
530                     }
531
532                     snprintf(inst_name, sizeof(inst_name), "auto_resampler_%d",
533                              resampler_count++);
534                     scale_args[0] = '\0';
535                     if (graph->aresample_swr_opts)
536                         snprintf(scale_args, sizeof(scale_args), "%s",
537                                  graph->aresample_swr_opts);
538                     if ((ret = avfilter_graph_create_filter(&convert, filter,
539                                                             inst_name, graph->aresample_swr_opts,
540                                                             NULL, graph)) < 0)
541                         return ret;
542                     break;
543                 default:
544                     return AVERROR(EINVAL);
545                 }
546
547                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
548                     return ret;
549
550                 if ((ret = filter_query_formats(convert)) < 0)
551                     return ret;
552
553                 inlink  = convert->inputs[0];
554                 outlink = convert->outputs[0];
555                 av_assert0( inlink-> in_formats->refcount > 0);
556                 av_assert0( inlink->out_formats->refcount > 0);
557                 av_assert0(outlink-> in_formats->refcount > 0);
558                 av_assert0(outlink->out_formats->refcount > 0);
559                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
560                     av_assert0( inlink-> in_samplerates->refcount > 0);
561                     av_assert0( inlink->out_samplerates->refcount > 0);
562                     av_assert0(outlink-> in_samplerates->refcount > 0);
563                     av_assert0(outlink->out_samplerates->refcount > 0);
564                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
565                     av_assert0( inlink->out_channel_layouts->refcount > 0);
566                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
567                     av_assert0(outlink->out_channel_layouts->refcount > 0);
568                 }
569                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
570                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
571                     ret = AVERROR(ENOSYS);
572                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
573                     (!ff_merge_samplerates(inlink->in_samplerates,
574                                            inlink->out_samplerates) ||
575                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
576                                                inlink->out_channel_layouts)))
577                     ret = AVERROR(ENOSYS);
578                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
579                     (!ff_merge_samplerates(outlink->in_samplerates,
580                                            outlink->out_samplerates) ||
581                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
582                                                outlink->out_channel_layouts)))
583                     ret = AVERROR(ENOSYS);
584
585                 if (ret < 0) {
586                     av_log(log_ctx, AV_LOG_ERROR,
587                            "Impossible to convert between the formats supported by the filter "
588                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
589                     return ret;
590                 }
591             }
592         }
593     }
594
595     av_log(graph, AV_LOG_DEBUG, "query_formats: "
596            "%d queried, %d merged, %d already done, %d delayed\n",
597            count_queried, count_merged, count_already_merged, count_delayed);
598     if (count_delayed) {
599         AVBPrint bp;
600
601         /* if count_queried > 0, one filter at least did set its formats,
602            that will give additional information to its neighbour;
603            if count_merged > 0, one pair of formats lists at least was merged,
604            that will give additional information to all connected filters;
605            in both cases, progress was made and a new round must be done */
606         if (count_queried || count_merged)
607             return AVERROR(EAGAIN);
608         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
609         for (i = 0; i < graph->nb_filters; i++)
610             if (!formats_declared(graph->filters[i]))
611                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
612                           graph->filters[i]->name);
613         av_log(graph, AV_LOG_ERROR,
614                "The following filters could not choose their formats: %s\n"
615                "Consider inserting the (a)format filter near their input or "
616                "output.\n", bp.str);
617         return AVERROR(EIO);
618     }
619     return 0;
620 }
621
622 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
623 {
624     int score = 0;
625
626     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
627         score ++;
628
629     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
630         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
631     }else
632         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
633
634     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
635         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
636         score += 20;
637
638     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
639         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
640         score += 2;
641
642     return score;
643 }
644
645 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
646                                                      enum AVSampleFormat src_fmt)
647 {
648     int score1, score2;
649
650     score1 = get_fmt_score(dst_fmt1, src_fmt);
651     score2 = get_fmt_score(dst_fmt2, src_fmt);
652
653     return score1 < score2 ? dst_fmt1 : dst_fmt2;
654 }
655
656 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
657 {
658     if (!link || !link->in_formats)
659         return 0;
660
661     if (link->type == AVMEDIA_TYPE_VIDEO) {
662         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
663             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
664             enum AVPixelFormat best= AV_PIX_FMT_NONE;
665             int i;
666             for (i=0; i<link->in_formats->nb_formats; i++) {
667                 enum AVPixelFormat p = link->in_formats->formats[i];
668                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
669             }
670             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
671                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
672                    av_get_pix_fmt_name(ref->format), has_alpha);
673             link->in_formats->formats[0] = best;
674         }
675     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
676         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
677             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
678             int i;
679             for (i=0; i<link->in_formats->nb_formats; i++) {
680                 enum AVSampleFormat p = link->in_formats->formats[i];
681                 best = find_best_sample_fmt_of_2(best, p, ref->format);
682             }
683             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
684                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
685                    av_get_sample_fmt_name(ref->format));
686             link->in_formats->formats[0] = best;
687         }
688     }
689
690     link->in_formats->nb_formats = 1;
691     link->format = link->in_formats->formats[0];
692
693     if (link->type == AVMEDIA_TYPE_AUDIO) {
694         if (!link->in_samplerates->nb_formats) {
695             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
696                    " the link between filters %s and %s.\n", link->src->name,
697                    link->dst->name);
698             return AVERROR(EINVAL);
699         }
700         link->in_samplerates->nb_formats = 1;
701         link->sample_rate = link->in_samplerates->formats[0];
702
703         if (link->in_channel_layouts->all_layouts) {
704             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
705                    " the link between filters %s and %s.\n", link->src->name,
706                    link->dst->name);
707             if (!link->in_channel_layouts->all_counts)
708                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
709                        "supported, try specifying a channel layout using "
710                        "'aformat=channel_layouts=something'.\n");
711             return AVERROR(EINVAL);
712         }
713         link->in_channel_layouts->nb_channel_layouts = 1;
714         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
715         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
716             link->channel_layout = 0;
717         else
718             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
719     }
720
721     ff_formats_unref(&link->in_formats);
722     ff_formats_unref(&link->out_formats);
723     ff_formats_unref(&link->in_samplerates);
724     ff_formats_unref(&link->out_samplerates);
725     ff_channel_layouts_unref(&link->in_channel_layouts);
726     ff_channel_layouts_unref(&link->out_channel_layouts);
727
728     return 0;
729 }
730
731 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
732 do {                                                                   \
733     for (i = 0; i < filter->nb_inputs; i++) {                          \
734         AVFilterLink *link = filter->inputs[i];                        \
735         fmt_type fmt;                                                  \
736                                                                        \
737         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
738             continue;                                                  \
739         fmt = link->out_ ## list->var[0];                              \
740                                                                        \
741         for (j = 0; j < filter->nb_outputs; j++) {                     \
742             AVFilterLink *out_link = filter->outputs[j];               \
743             list_type *fmts;                                           \
744                                                                        \
745             if (link->type != out_link->type ||                        \
746                 out_link->in_ ## list->nb == 1)                        \
747                 continue;                                              \
748             fmts = out_link->in_ ## list;                              \
749                                                                        \
750             if (!out_link->in_ ## list->nb) {                          \
751                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
752                     return ret;                                        \
753                 ret = 1;                                               \
754                 break;                                                 \
755             }                                                          \
756                                                                        \
757             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
758                 if (fmts->var[k] == fmt) {                             \
759                     fmts->var[0]  = fmt;                               \
760                     fmts->nb = 1;                                      \
761                     ret = 1;                                           \
762                     break;                                             \
763                 }                                                      \
764         }                                                              \
765     }                                                                  \
766 } while (0)
767
768 static int reduce_formats_on_filter(AVFilterContext *filter)
769 {
770     int i, j, k, ret = 0;
771
772     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
773                    nb_formats, ff_add_format, ff_formats_unref);
774     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
775                    nb_formats, ff_add_format, ff_formats_unref);
776
777     /* reduce channel layouts */
778     for (i = 0; i < filter->nb_inputs; i++) {
779         AVFilterLink *inlink = filter->inputs[i];
780         uint64_t fmt;
781
782         if (!inlink->out_channel_layouts ||
783             inlink->out_channel_layouts->nb_channel_layouts != 1)
784             continue;
785         fmt = inlink->out_channel_layouts->channel_layouts[0];
786
787         for (j = 0; j < filter->nb_outputs; j++) {
788             AVFilterLink *outlink = filter->outputs[j];
789             AVFilterChannelLayouts *fmts;
790
791             fmts = outlink->in_channel_layouts;
792             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
793                 continue;
794
795             if (fmts->all_layouts &&
796                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
797                 /* Turn the infinite list into a singleton */
798                 fmts->all_layouts = fmts->all_counts  = 0;
799                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
800                     ret = 1;
801                 break;
802             }
803
804             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
805                 if (fmts->channel_layouts[k] == fmt) {
806                     fmts->channel_layouts[0]  = fmt;
807                     fmts->nb_channel_layouts = 1;
808                     ret = 1;
809                     break;
810                 }
811             }
812         }
813     }
814
815     return ret;
816 }
817
818 static int reduce_formats(AVFilterGraph *graph)
819 {
820     int i, reduced, ret;
821
822     do {
823         reduced = 0;
824
825         for (i = 0; i < graph->nb_filters; i++) {
826             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
827                 return ret;
828             reduced |= ret;
829         }
830     } while (reduced);
831
832     return 0;
833 }
834
835 static void swap_samplerates_on_filter(AVFilterContext *filter)
836 {
837     AVFilterLink *link = NULL;
838     int sample_rate;
839     int i, j;
840
841     for (i = 0; i < filter->nb_inputs; i++) {
842         link = filter->inputs[i];
843
844         if (link->type == AVMEDIA_TYPE_AUDIO &&
845             link->out_samplerates->nb_formats== 1)
846             break;
847     }
848     if (i == filter->nb_inputs)
849         return;
850
851     sample_rate = link->out_samplerates->formats[0];
852
853     for (i = 0; i < filter->nb_outputs; i++) {
854         AVFilterLink *outlink = filter->outputs[i];
855         int best_idx, best_diff = INT_MAX;
856
857         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
858             outlink->in_samplerates->nb_formats < 2)
859             continue;
860
861         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
862             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
863
864             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
865
866             if (diff < best_diff) {
867                 best_diff = diff;
868                 best_idx  = j;
869             }
870         }
871         FFSWAP(int, outlink->in_samplerates->formats[0],
872                outlink->in_samplerates->formats[best_idx]);
873     }
874 }
875
876 static void swap_samplerates(AVFilterGraph *graph)
877 {
878     int i;
879
880     for (i = 0; i < graph->nb_filters; i++)
881         swap_samplerates_on_filter(graph->filters[i]);
882 }
883
884 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
885 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
886 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
887 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
888 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
889 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
890 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
891
892 /* allowable substitutions for channel pairs when comparing layouts,
893  * ordered by priority for both values */
894 static const uint64_t ch_subst[][2] = {
895     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
896     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
897     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
898     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
899     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
900     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
901     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
902     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
903     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
904     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
905     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
906     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
907     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
908     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
909     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
910     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
911     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
912     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
913     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
914     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
915     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
916 };
917
918 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
919 {
920     AVFilterLink *link = NULL;
921     int i, j, k;
922
923     for (i = 0; i < filter->nb_inputs; i++) {
924         link = filter->inputs[i];
925
926         if (link->type == AVMEDIA_TYPE_AUDIO &&
927             link->out_channel_layouts->nb_channel_layouts == 1)
928             break;
929     }
930     if (i == filter->nb_inputs)
931         return;
932
933     for (i = 0; i < filter->nb_outputs; i++) {
934         AVFilterLink *outlink = filter->outputs[i];
935         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
936
937         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
938             outlink->in_channel_layouts->nb_channel_layouts < 2)
939             continue;
940
941         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
942             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
943             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
944             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
945             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
946             int count_diff        = out_channels - in_channels;
947             int matched_channels, extra_channels;
948             int score = 100000;
949
950             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
951                 /* Compute score in case the input or output layout encodes
952                    a channel count; in this case the score is not altered by
953                    the computation afterwards, as in_chlayout and
954                    out_chlayout have both been set to 0 */
955                 if (FF_LAYOUT2COUNT(in_chlayout))
956                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
957                 if (FF_LAYOUT2COUNT(out_chlayout))
958                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
959                 score -= 10000 + FFABS(out_channels - in_channels) +
960                          (in_channels > out_channels ? 10000 : 0);
961                 in_chlayout = out_chlayout = 0;
962                 /* Let the remaining computation run, even if the score
963                    value is not altered */
964             }
965
966             /* channel substitution */
967             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
968                 uint64_t cmp0 = ch_subst[k][0];
969                 uint64_t cmp1 = ch_subst[k][1];
970                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
971                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
972                     in_chlayout  &= ~cmp0;
973                     out_chlayout &= ~cmp1;
974                     /* add score for channel match, minus a deduction for
975                        having to do the substitution */
976                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
977                 }
978             }
979
980             /* no penalty for LFE channel mismatch */
981             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
982                 (out_chlayout & AV_CH_LOW_FREQUENCY))
983                 score += 10;
984             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
985             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
986
987             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
988                                                                  out_chlayout);
989             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
990                                                                  (~in_chlayout));
991             score += 10 * matched_channels - 5 * extra_channels;
992
993             if (score > best_score ||
994                 (count_diff < best_count_diff && score == best_score)) {
995                 best_score = score;
996                 best_idx   = j;
997                 best_count_diff = count_diff;
998             }
999         }
1000         av_assert0(best_idx >= 0);
1001         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1002                outlink->in_channel_layouts->channel_layouts[best_idx]);
1003     }
1004
1005 }
1006
1007 static void swap_channel_layouts(AVFilterGraph *graph)
1008 {
1009     int i;
1010
1011     for (i = 0; i < graph->nb_filters; i++)
1012         swap_channel_layouts_on_filter(graph->filters[i]);
1013 }
1014
1015 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1016 {
1017     AVFilterLink *link = NULL;
1018     int format, bps;
1019     int i, j;
1020
1021     for (i = 0; i < filter->nb_inputs; i++) {
1022         link = filter->inputs[i];
1023
1024         if (link->type == AVMEDIA_TYPE_AUDIO &&
1025             link->out_formats->nb_formats == 1)
1026             break;
1027     }
1028     if (i == filter->nb_inputs)
1029         return;
1030
1031     format = link->out_formats->formats[0];
1032     bps    = av_get_bytes_per_sample(format);
1033
1034     for (i = 0; i < filter->nb_outputs; i++) {
1035         AVFilterLink *outlink = filter->outputs[i];
1036         int best_idx = -1, best_score = INT_MIN;
1037
1038         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1039             outlink->in_formats->nb_formats < 2)
1040             continue;
1041
1042         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1043             int out_format = outlink->in_formats->formats[j];
1044             int out_bps    = av_get_bytes_per_sample(out_format);
1045             int score;
1046
1047             if (av_get_packed_sample_fmt(out_format) == format ||
1048                 av_get_planar_sample_fmt(out_format) == format) {
1049                 best_idx   = j;
1050                 break;
1051             }
1052
1053             /* for s32 and float prefer double to prevent loss of information */
1054             if (bps == 4 && out_bps == 8) {
1055                 best_idx = j;
1056                 break;
1057             }
1058
1059             /* prefer closest higher or equal bps */
1060             score = -abs(out_bps - bps);
1061             if (out_bps >= bps)
1062                 score += INT_MAX/2;
1063
1064             if (score > best_score) {
1065                 best_score = score;
1066                 best_idx   = j;
1067             }
1068         }
1069         av_assert0(best_idx >= 0);
1070         FFSWAP(int, outlink->in_formats->formats[0],
1071                outlink->in_formats->formats[best_idx]);
1072     }
1073 }
1074
1075 static void swap_sample_fmts(AVFilterGraph *graph)
1076 {
1077     int i;
1078
1079     for (i = 0; i < graph->nb_filters; i++)
1080         swap_sample_fmts_on_filter(graph->filters[i]);
1081
1082 }
1083
1084 static int pick_formats(AVFilterGraph *graph)
1085 {
1086     int i, j, ret;
1087     int change;
1088
1089     do{
1090         change = 0;
1091         for (i = 0; i < graph->nb_filters; i++) {
1092             AVFilterContext *filter = graph->filters[i];
1093             if (filter->nb_inputs){
1094                 for (j = 0; j < filter->nb_inputs; j++){
1095                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1096                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1097                             return ret;
1098                         change = 1;
1099                     }
1100                 }
1101             }
1102             if (filter->nb_outputs){
1103                 for (j = 0; j < filter->nb_outputs; j++){
1104                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1105                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1106                             return ret;
1107                         change = 1;
1108                     }
1109                 }
1110             }
1111             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1112                 for (j = 0; j < filter->nb_outputs; j++) {
1113                     if(filter->outputs[j]->format<0) {
1114                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1115                             return ret;
1116                         change = 1;
1117                     }
1118                 }
1119             }
1120         }
1121     }while(change);
1122
1123     for (i = 0; i < graph->nb_filters; i++) {
1124         AVFilterContext *filter = graph->filters[i];
1125
1126         for (j = 0; j < filter->nb_inputs; j++)
1127             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1128                 return ret;
1129         for (j = 0; j < filter->nb_outputs; j++)
1130             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1131                 return ret;
1132     }
1133     return 0;
1134 }
1135
1136 /**
1137  * Configure the formats of all the links in the graph.
1138  */
1139 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1140 {
1141     int ret;
1142
1143     /* find supported formats from sub-filters, and merge along links */
1144     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1145         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1146     if (ret < 0)
1147         return ret;
1148
1149     /* Once everything is merged, it's possible that we'll still have
1150      * multiple valid media format choices. We try to minimize the amount
1151      * of format conversion inside filters */
1152     if ((ret = reduce_formats(graph)) < 0)
1153         return ret;
1154
1155     /* for audio filters, ensure the best format, sample rate and channel layout
1156      * is selected */
1157     swap_sample_fmts(graph);
1158     swap_samplerates(graph);
1159     swap_channel_layouts(graph);
1160
1161     if ((ret = pick_formats(graph)) < 0)
1162         return ret;
1163
1164     return 0;
1165 }
1166
1167 static int graph_config_pointers(AVFilterGraph *graph,
1168                                              AVClass *log_ctx)
1169 {
1170     unsigned i, j;
1171     int sink_links_count = 0, n = 0;
1172     AVFilterContext *f;
1173     AVFilterLink **sinks;
1174
1175     for (i = 0; i < graph->nb_filters; i++) {
1176         f = graph->filters[i];
1177         for (j = 0; j < f->nb_inputs; j++) {
1178             f->inputs[j]->graph     = graph;
1179             f->inputs[j]->age_index = -1;
1180         }
1181         for (j = 0; j < f->nb_outputs; j++) {
1182             f->outputs[j]->graph    = graph;
1183             f->outputs[j]->age_index= -1;
1184         }
1185         if (!f->nb_outputs) {
1186             if (f->nb_inputs > INT_MAX - sink_links_count)
1187                 return AVERROR(EINVAL);
1188             sink_links_count += f->nb_inputs;
1189         }
1190     }
1191     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1192     if (!sinks)
1193         return AVERROR(ENOMEM);
1194     for (i = 0; i < graph->nb_filters; i++) {
1195         f = graph->filters[i];
1196         if (!f->nb_outputs) {
1197             for (j = 0; j < f->nb_inputs; j++) {
1198                 sinks[n] = f->inputs[j];
1199                 f->inputs[j]->age_index = n++;
1200             }
1201         }
1202     }
1203     av_assert0(n == sink_links_count);
1204     graph->sink_links       = sinks;
1205     graph->sink_links_count = sink_links_count;
1206     return 0;
1207 }
1208
1209 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1210 {
1211     AVFilterContext *f;
1212     int i, j, ret;
1213     int fifo_count = 0;
1214
1215     for (i = 0; i < graph->nb_filters; i++) {
1216         f = graph->filters[i];
1217
1218         for (j = 0; j < f->nb_inputs; j++) {
1219             AVFilterLink *link = f->inputs[j];
1220             AVFilterContext *fifo_ctx;
1221             const AVFilter *fifo;
1222             char name[32];
1223
1224             if (!link->dstpad->needs_fifo)
1225                 continue;
1226
1227             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1228                    avfilter_get_by_name("fifo") :
1229                    avfilter_get_by_name("afifo");
1230
1231             snprintf(name, sizeof(name), "auto_fifo_%d", fifo_count++);
1232
1233             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1234                                                NULL, graph);
1235             if (ret < 0)
1236                 return ret;
1237
1238             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1239             if (ret < 0)
1240                 return ret;
1241         }
1242     }
1243
1244     return 0;
1245 }
1246
1247 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1248 {
1249     int ret;
1250
1251     if ((ret = graph_check_validity(graphctx, log_ctx)))
1252         return ret;
1253     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1254         return ret;
1255     if ((ret = graph_config_formats(graphctx, log_ctx)))
1256         return ret;
1257     if ((ret = graph_config_links(graphctx, log_ctx)))
1258         return ret;
1259     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1260         return ret;
1261
1262     return 0;
1263 }
1264
1265 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1266 {
1267     int i, r = AVERROR(ENOSYS);
1268
1269     if (!graph)
1270         return r;
1271
1272     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1273         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1274         if (r != AVERROR(ENOSYS))
1275             return r;
1276     }
1277
1278     if (res_len && res)
1279         res[0] = 0;
1280
1281     for (i = 0; i < graph->nb_filters; i++) {
1282         AVFilterContext *filter = graph->filters[i];
1283         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1284             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1285             if (r != AVERROR(ENOSYS)) {
1286                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1287                     return r;
1288             }
1289         }
1290     }
1291
1292     return r;
1293 }
1294
1295 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1296 {
1297     int i;
1298
1299     if(!graph)
1300         return 0;
1301
1302     for (i = 0; i < graph->nb_filters; i++) {
1303         AVFilterContext *filter = graph->filters[i];
1304         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1305             AVFilterCommand **queue = &filter->command_queue, *next;
1306             while (*queue && (*queue)->time <= ts)
1307                 queue = &(*queue)->next;
1308             next = *queue;
1309             *queue = av_mallocz(sizeof(AVFilterCommand));
1310             if (!*queue)
1311                 return AVERROR(ENOMEM);
1312
1313             (*queue)->command = av_strdup(command);
1314             (*queue)->arg     = av_strdup(arg);
1315             (*queue)->time    = ts;
1316             (*queue)->flags   = flags;
1317             (*queue)->next    = next;
1318             if(flags & AVFILTER_CMD_FLAG_ONE)
1319                 return 0;
1320         }
1321     }
1322
1323     return 0;
1324 }
1325
1326 static void heap_bubble_up(AVFilterGraph *graph,
1327                            AVFilterLink *link, int index)
1328 {
1329     AVFilterLink **links = graph->sink_links;
1330
1331     av_assert0(index >= 0);
1332
1333     while (index) {
1334         int parent = (index - 1) >> 1;
1335         if (links[parent]->current_pts_us >= link->current_pts_us)
1336             break;
1337         links[index] = links[parent];
1338         links[index]->age_index = index;
1339         index = parent;
1340     }
1341     links[index] = link;
1342     link->age_index = index;
1343 }
1344
1345 static void heap_bubble_down(AVFilterGraph *graph,
1346                              AVFilterLink *link, int index)
1347 {
1348     AVFilterLink **links = graph->sink_links;
1349
1350     av_assert0(index >= 0);
1351
1352     while (1) {
1353         int child = 2 * index + 1;
1354         if (child >= graph->sink_links_count)
1355             break;
1356         if (child + 1 < graph->sink_links_count &&
1357             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1358             child++;
1359         if (link->current_pts_us < links[child]->current_pts_us)
1360             break;
1361         links[index] = links[child];
1362         links[index]->age_index = index;
1363         index = child;
1364     }
1365     links[index] = link;
1366     link->age_index = index;
1367 }
1368
1369 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1370 {
1371     heap_bubble_up  (graph, link, link->age_index);
1372     heap_bubble_down(graph, link, link->age_index);
1373 }
1374
1375 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1376 {
1377     AVFilterLink *oldest = graph->sink_links[0];
1378     int64_t frame_count;
1379     int r;
1380
1381     while (graph->sink_links_count) {
1382         oldest = graph->sink_links[0];
1383         if (oldest->dst->filter->activate) {
1384             /* For now, buffersink is the only filter implementing activate. */
1385             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1386                                               AV_BUFFERSINK_FLAG_PEEK);
1387             if (r != AVERROR_EOF)
1388                 return r;
1389         } else {
1390             r = ff_request_frame(oldest);
1391         }
1392         if (r != AVERROR_EOF)
1393             break;
1394         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1395                oldest->dst ? oldest->dst->name : "unknown",
1396                oldest->dstpad ? oldest->dstpad->name : "unknown");
1397         /* EOF: remove the link from the heap */
1398         if (oldest->age_index < --graph->sink_links_count)
1399             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1400                              oldest->age_index);
1401         oldest->age_index = -1;
1402     }
1403     if (!graph->sink_links_count)
1404         return AVERROR_EOF;
1405     av_assert1(!oldest->dst->filter->activate);
1406     av_assert1(oldest->age_index >= 0);
1407     frame_count = oldest->frame_count_out;
1408     while (frame_count == oldest->frame_count_out) {
1409         r = ff_filter_graph_run_once(graph);
1410         if (r == AVERROR(EAGAIN) &&
1411             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1412             !oldest->status_in)
1413             ff_request_frame(oldest);
1414         else if (r < 0)
1415             return r;
1416     }
1417     return 0;
1418 }
1419
1420 int ff_filter_graph_run_once(AVFilterGraph *graph)
1421 {
1422     AVFilterContext *filter;
1423     unsigned i;
1424
1425     av_assert0(graph->nb_filters);
1426     filter = graph->filters[0];
1427     for (i = 1; i < graph->nb_filters; i++)
1428         if (graph->filters[i]->ready > filter->ready)
1429             filter = graph->filters[i];
1430     if (!filter->ready)
1431         return AVERROR(EAGAIN);
1432     return ff_filter_activate(filter);
1433 }