cmdutils: fix new API break the "ffmpeg -muxers/demuxers"
[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/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/pixdesc.h"
35
36 #define FF_INTERNAL_FIELDS 1
37 #include "framequeue.h"
38
39 #include "avfilter.h"
40 #include "buffersink.h"
41 #include "formats.h"
42 #include "internal.h"
43 #include "thread.h"
44
45 #define OFFSET(x) offsetof(AVFilterGraph, x)
46 #define F AV_OPT_FLAG_FILTERING_PARAM
47 #define V AV_OPT_FLAG_VIDEO_PARAM
48 #define A AV_OPT_FLAG_AUDIO_PARAM
49 static const AVOption filtergraph_options[] = {
50     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
51         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, F|V|A, "thread_type" },
52         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = F|V|A, .unit = "thread_type" },
53     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
54         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, F|V|A },
55     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
56         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|V },
57     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
58         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|A },
59     { NULL },
60 };
61
62 static const AVClass filtergraph_class = {
63     .class_name = "AVFilterGraph",
64     .item_name  = av_default_item_name,
65     .version    = LIBAVUTIL_VERSION_INT,
66     .option     = filtergraph_options,
67     .category   = AV_CLASS_CATEGORY_FILTER,
68 };
69
70 #if !HAVE_THREADS
71 void ff_graph_thread_free(AVFilterGraph *graph)
72 {
73 }
74
75 int ff_graph_thread_init(AVFilterGraph *graph)
76 {
77     graph->thread_type = 0;
78     graph->nb_threads  = 1;
79     return 0;
80 }
81 #endif
82
83 AVFilterGraph *avfilter_graph_alloc(void)
84 {
85     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
86     if (!ret)
87         return NULL;
88
89     ret->internal = av_mallocz(sizeof(*ret->internal));
90     if (!ret->internal) {
91         av_freep(&ret);
92         return NULL;
93     }
94
95     ret->av_class = &filtergraph_class;
96     av_opt_set_defaults(ret);
97     ff_framequeue_global_init(&ret->internal->frame_queues);
98
99     return ret;
100 }
101
102 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
103 {
104     int i, j;
105     for (i = 0; i < graph->nb_filters; i++) {
106         if (graph->filters[i] == filter) {
107             FFSWAP(AVFilterContext*, graph->filters[i],
108                    graph->filters[graph->nb_filters - 1]);
109             graph->nb_filters--;
110             filter->graph = NULL;
111             for (j = 0; j<filter->nb_outputs; j++)
112                 if (filter->outputs[j])
113                     filter->outputs[j]->graph = NULL;
114
115             return;
116         }
117     }
118 }
119
120 void avfilter_graph_free(AVFilterGraph **graph)
121 {
122     if (!*graph)
123         return;
124
125     while ((*graph)->nb_filters)
126         avfilter_free((*graph)->filters[0]);
127
128     ff_graph_thread_free(*graph);
129
130     av_freep(&(*graph)->sink_links);
131
132     av_freep(&(*graph)->scale_sws_opts);
133     av_freep(&(*graph)->aresample_swr_opts);
134 #if FF_API_LAVR_OPTS
135     av_freep(&(*graph)->resample_lavr_opts);
136 #endif
137     av_freep(&(*graph)->filters);
138     av_freep(&(*graph)->internal);
139     av_freep(graph);
140 }
141
142 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
143                                  const char *name, const char *args, void *opaque,
144                                  AVFilterGraph *graph_ctx)
145 {
146     int ret;
147
148     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
149     if (!*filt_ctx)
150         return AVERROR(ENOMEM);
151
152     ret = avfilter_init_str(*filt_ctx, args);
153     if (ret < 0)
154         goto fail;
155
156     return 0;
157
158 fail:
159     if (*filt_ctx)
160         avfilter_free(*filt_ctx);
161     *filt_ctx = NULL;
162     return ret;
163 }
164
165 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
166 {
167     graph->disable_auto_convert = flags;
168 }
169
170 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
171                                              const AVFilter *filter,
172                                              const char *name)
173 {
174     AVFilterContext **filters, *s;
175
176     if (graph->thread_type && !graph->internal->thread_execute) {
177         if (graph->execute) {
178             graph->internal->thread_execute = graph->execute;
179         } else {
180             int ret = ff_graph_thread_init(graph);
181             if (ret < 0) {
182                 av_log(graph, AV_LOG_ERROR, "Error initializing threading: %s.\n", av_err2str(ret));
183                 return NULL;
184             }
185         }
186     }
187
188     s = ff_filter_alloc(filter, name);
189     if (!s)
190         return NULL;
191
192     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
193     if (!filters) {
194         avfilter_free(s);
195         return NULL;
196     }
197
198     graph->filters = filters;
199     graph->filters[graph->nb_filters++] = s;
200
201     s->graph = graph;
202
203     return s;
204 }
205
206 /**
207  * Check for the validity of graph.
208  *
209  * A graph is considered valid if all its input and output pads are
210  * connected.
211  *
212  * @return >= 0 in case of success, a negative value otherwise
213  */
214 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
215 {
216     AVFilterContext *filt;
217     int i, j;
218
219     for (i = 0; i < graph->nb_filters; i++) {
220         const AVFilterPad *pad;
221         filt = graph->filters[i];
222
223         for (j = 0; j < filt->nb_inputs; j++) {
224             if (!filt->inputs[j] || !filt->inputs[j]->src) {
225                 pad = &filt->input_pads[j];
226                 av_log(log_ctx, AV_LOG_ERROR,
227                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
228                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
229                 return AVERROR(EINVAL);
230             }
231         }
232
233         for (j = 0; j < filt->nb_outputs; j++) {
234             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
235                 pad = &filt->output_pads[j];
236                 av_log(log_ctx, AV_LOG_ERROR,
237                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
238                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
239                 return AVERROR(EINVAL);
240             }
241         }
242     }
243
244     return 0;
245 }
246
247 /**
248  * Configure all the links of graphctx.
249  *
250  * @return >= 0 in case of success, a negative value otherwise
251  */
252 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
253 {
254     AVFilterContext *filt;
255     int i, ret;
256
257     for (i = 0; i < graph->nb_filters; i++) {
258         filt = graph->filters[i];
259
260         if (!filt->nb_outputs) {
261             if ((ret = avfilter_config_links(filt)))
262                 return ret;
263         }
264     }
265
266     return 0;
267 }
268
269 static int graph_check_links(AVFilterGraph *graph, AVClass *log_ctx)
270 {
271     AVFilterContext *f;
272     AVFilterLink *l;
273     unsigned i, j;
274     int ret;
275
276     for (i = 0; i < graph->nb_filters; i++) {
277         f = graph->filters[i];
278         for (j = 0; j < f->nb_outputs; j++) {
279             l = f->outputs[j];
280             if (l->type == AVMEDIA_TYPE_VIDEO) {
281                 ret = av_image_check_size2(l->w, l->h, INT64_MAX, l->format, 0, f);
282                 if (ret < 0)
283                     return ret;
284             }
285         }
286     }
287     return 0;
288 }
289
290 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
291 {
292     int i;
293
294     for (i = 0; i < graph->nb_filters; i++)
295         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
296             return graph->filters[i];
297
298     return NULL;
299 }
300
301 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
302 {
303     if (!l)
304         return;
305     if (l->nb_channel_layouts) {
306         if (l->all_layouts || l->all_counts)
307             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
308         l->all_layouts = l->all_counts = 0;
309     } else {
310         if (l->all_counts && !l->all_layouts)
311             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
312         l->all_layouts = 1;
313     }
314 }
315
316 static int filter_query_formats(AVFilterContext *ctx)
317 {
318     int ret, i;
319     AVFilterFormats *formats;
320     AVFilterChannelLayouts *chlayouts;
321     AVFilterFormats *samplerates;
322     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
323                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
324                             AVMEDIA_TYPE_VIDEO;
325
326     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
327         if (ret != AVERROR(EAGAIN))
328             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
329                    ctx->name, av_err2str(ret));
330         return ret;
331     }
332
333     for (i = 0; i < ctx->nb_inputs; i++)
334         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
335     for (i = 0; i < ctx->nb_outputs; i++)
336         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
337
338     formats = ff_all_formats(type);
339     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
340         return ret;
341     if (type == AVMEDIA_TYPE_AUDIO) {
342         samplerates = ff_all_samplerates();
343         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
344             return ret;
345         chlayouts = ff_all_channel_layouts();
346         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
347             return ret;
348     }
349     return 0;
350 }
351
352 static int formats_declared(AVFilterContext *f)
353 {
354     int i;
355
356     for (i = 0; i < f->nb_inputs; i++) {
357         if (!f->inputs[i]->out_formats)
358             return 0;
359         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
360             !(f->inputs[i]->out_samplerates &&
361               f->inputs[i]->out_channel_layouts))
362             return 0;
363     }
364     for (i = 0; i < f->nb_outputs; i++) {
365         if (!f->outputs[i]->in_formats)
366             return 0;
367         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
368             !(f->outputs[i]->in_samplerates &&
369               f->outputs[i]->in_channel_layouts))
370             return 0;
371     }
372     return 1;
373 }
374
375 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
376 {
377     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
378     if (a) {
379         a->refcount = 0;
380         a->refs     = NULL;
381         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
382         if (!a->formats && arg->formats)
383             av_freep(&a);
384     }
385     return a;
386 }
387
388 static int can_merge_formats(AVFilterFormats *a_arg,
389                              AVFilterFormats *b_arg,
390                              enum AVMediaType type,
391                              int is_sample_rate)
392 {
393     AVFilterFormats *a, *b, *ret;
394     if (a_arg == b_arg)
395         return 1;
396     a = clone_filter_formats(a_arg);
397     b = clone_filter_formats(b_arg);
398
399     if (!a || !b) {
400         if (a)
401             av_freep(&a->formats);
402         if (b)
403             av_freep(&b->formats);
404
405         av_freep(&a);
406         av_freep(&b);
407
408         return 0;
409     }
410
411     if (is_sample_rate) {
412         ret = ff_merge_samplerates(a, b);
413     } else {
414         ret = ff_merge_formats(a, b, type);
415     }
416     if (ret) {
417         av_freep(&ret->formats);
418         av_freep(&ret->refs);
419         av_freep(&ret);
420         return 1;
421     } else {
422         av_freep(&a->formats);
423         av_freep(&b->formats);
424         av_freep(&a);
425         av_freep(&b);
426         return 0;
427     }
428 }
429
430 /**
431  * Perform one round of query_formats() and merging formats lists on the
432  * filter graph.
433  * @return  >=0 if all links formats lists could be queried and merged;
434  *          AVERROR(EAGAIN) some progress was made in the queries or merging
435  *          and a later call may succeed;
436  *          AVERROR(EIO) (may be changed) plus a log message if no progress
437  *          was made and the negotiation is stuck;
438  *          a negative error code if some other error happened
439  */
440 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
441 {
442     int i, j, ret;
443     int scaler_count = 0, resampler_count = 0;
444     int count_queried = 0;        /* successful calls to query_formats() */
445     int count_merged = 0;         /* successful merge of formats lists */
446     int count_already_merged = 0; /* lists already merged */
447     int count_delayed = 0;        /* lists that need to be merged later */
448
449     for (i = 0; i < graph->nb_filters; i++) {
450         AVFilterContext *f = graph->filters[i];
451         if (formats_declared(f))
452             continue;
453         if (f->filter->query_formats)
454             ret = filter_query_formats(f);
455         else
456             ret = ff_default_query_formats(f);
457         if (ret < 0 && ret != AVERROR(EAGAIN))
458             return ret;
459         /* note: EAGAIN could indicate a partial success, not counted yet */
460         count_queried += ret >= 0;
461     }
462
463     /* go through and merge as many format lists as possible */
464     for (i = 0; i < graph->nb_filters; i++) {
465         AVFilterContext *filter = graph->filters[i];
466
467         for (j = 0; j < filter->nb_inputs; j++) {
468             AVFilterLink *link = filter->inputs[j];
469             int convert_needed = 0;
470
471             if (!link)
472                 continue;
473
474             if (link->in_formats != link->out_formats
475                 && link->in_formats && link->out_formats)
476                 if (!can_merge_formats(link->in_formats, link->out_formats,
477                                       link->type, 0))
478                     convert_needed = 1;
479             if (link->type == AVMEDIA_TYPE_AUDIO) {
480                 if (link->in_samplerates != link->out_samplerates
481                     && link->in_samplerates && link->out_samplerates)
482                     if (!can_merge_formats(link->in_samplerates,
483                                            link->out_samplerates,
484                                            0, 1))
485                         convert_needed = 1;
486             }
487
488 #define MERGE_DISPATCH(field, statement)                                     \
489             if (!(link->in_ ## field && link->out_ ## field)) {              \
490                 count_delayed++;                                             \
491             } else if (link->in_ ## field == link->out_ ## field) {          \
492                 count_already_merged++;                                      \
493             } else if (!convert_needed) {                                    \
494                 count_merged++;                                              \
495                 statement                                                    \
496             }
497
498             if (link->type == AVMEDIA_TYPE_AUDIO) {
499                 MERGE_DISPATCH(channel_layouts,
500                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
501                                                   link->out_channel_layouts))
502                         convert_needed = 1;
503                 )
504                 MERGE_DISPATCH(samplerates,
505                     if (!ff_merge_samplerates(link->in_samplerates,
506                                               link->out_samplerates))
507                         convert_needed = 1;
508                 )
509             }
510             MERGE_DISPATCH(formats,
511                 if (!ff_merge_formats(link->in_formats, link->out_formats,
512                                       link->type))
513                     convert_needed = 1;
514             )
515 #undef MERGE_DISPATCH
516
517             if (convert_needed) {
518                 AVFilterContext *convert;
519                 const AVFilter *filter;
520                 AVFilterLink *inlink, *outlink;
521                 char inst_name[30];
522
523                 if (graph->disable_auto_convert) {
524                     av_log(log_ctx, AV_LOG_ERROR,
525                            "The filters '%s' and '%s' do not have a common format "
526                            "and automatic conversion is disabled.\n",
527                            link->src->name, link->dst->name);
528                     return AVERROR(EINVAL);
529                 }
530
531                 /* couldn't merge format lists. auto-insert conversion filter */
532                 switch (link->type) {
533                 case AVMEDIA_TYPE_VIDEO:
534                     if (!(filter = avfilter_get_by_name("scale"))) {
535                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
536                                "not present, cannot convert pixel formats.\n");
537                         return AVERROR(EINVAL);
538                     }
539
540                     snprintf(inst_name, sizeof(inst_name), "auto_scaler_%d",
541                              scaler_count++);
542
543                     if ((ret = avfilter_graph_create_filter(&convert, filter,
544                                                             inst_name, graph->scale_sws_opts, NULL,
545                                                             graph)) < 0)
546                         return ret;
547                     break;
548                 case AVMEDIA_TYPE_AUDIO:
549                     if (!(filter = avfilter_get_by_name("aresample"))) {
550                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
551                                "not present, cannot convert audio formats.\n");
552                         return AVERROR(EINVAL);
553                     }
554
555                     snprintf(inst_name, sizeof(inst_name), "auto_resampler_%d",
556                              resampler_count++);
557                     if ((ret = avfilter_graph_create_filter(&convert, filter,
558                                                             inst_name, graph->aresample_swr_opts,
559                                                             NULL, graph)) < 0)
560                         return ret;
561                     break;
562                 default:
563                     return AVERROR(EINVAL);
564                 }
565
566                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
567                     return ret;
568
569                 if ((ret = filter_query_formats(convert)) < 0)
570                     return ret;
571
572                 inlink  = convert->inputs[0];
573                 outlink = convert->outputs[0];
574                 av_assert0( inlink-> in_formats->refcount > 0);
575                 av_assert0( inlink->out_formats->refcount > 0);
576                 av_assert0(outlink-> in_formats->refcount > 0);
577                 av_assert0(outlink->out_formats->refcount > 0);
578                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
579                     av_assert0( inlink-> in_samplerates->refcount > 0);
580                     av_assert0( inlink->out_samplerates->refcount > 0);
581                     av_assert0(outlink-> in_samplerates->refcount > 0);
582                     av_assert0(outlink->out_samplerates->refcount > 0);
583                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
584                     av_assert0( inlink->out_channel_layouts->refcount > 0);
585                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
586                     av_assert0(outlink->out_channel_layouts->refcount > 0);
587                 }
588                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
589                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
590                     ret = AVERROR(ENOSYS);
591                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
592                     (!ff_merge_samplerates(inlink->in_samplerates,
593                                            inlink->out_samplerates) ||
594                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
595                                                inlink->out_channel_layouts)))
596                     ret = AVERROR(ENOSYS);
597                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
598                     (!ff_merge_samplerates(outlink->in_samplerates,
599                                            outlink->out_samplerates) ||
600                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
601                                                outlink->out_channel_layouts)))
602                     ret = AVERROR(ENOSYS);
603
604                 if (ret < 0) {
605                     av_log(log_ctx, AV_LOG_ERROR,
606                            "Impossible to convert between the formats supported by the filter "
607                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
608                     return ret;
609                 }
610             }
611         }
612     }
613
614     av_log(graph, AV_LOG_DEBUG, "query_formats: "
615            "%d queried, %d merged, %d already done, %d delayed\n",
616            count_queried, count_merged, count_already_merged, count_delayed);
617     if (count_delayed) {
618         AVBPrint bp;
619
620         /* if count_queried > 0, one filter at least did set its formats,
621            that will give additional information to its neighbour;
622            if count_merged > 0, one pair of formats lists at least was merged,
623            that will give additional information to all connected filters;
624            in both cases, progress was made and a new round must be done */
625         if (count_queried || count_merged)
626             return AVERROR(EAGAIN);
627         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
628         for (i = 0; i < graph->nb_filters; i++)
629             if (!formats_declared(graph->filters[i]))
630                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
631                           graph->filters[i]->name);
632         av_log(graph, AV_LOG_ERROR,
633                "The following filters could not choose their formats: %s\n"
634                "Consider inserting the (a)format filter near their input or "
635                "output.\n", bp.str);
636         return AVERROR(EIO);
637     }
638     return 0;
639 }
640
641 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
642 {
643     int score = 0;
644
645     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
646         score ++;
647
648     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
649         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
650     }else
651         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
652
653     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
654         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
655         score += 20;
656
657     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
658         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
659         score += 2;
660
661     return score;
662 }
663
664 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
665                                                      enum AVSampleFormat src_fmt)
666 {
667     int score1, score2;
668
669     score1 = get_fmt_score(dst_fmt1, src_fmt);
670     score2 = get_fmt_score(dst_fmt2, src_fmt);
671
672     return score1 < score2 ? dst_fmt1 : dst_fmt2;
673 }
674
675 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
676 {
677     if (!link || !link->in_formats)
678         return 0;
679
680     if (link->type == AVMEDIA_TYPE_VIDEO) {
681         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
682             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
683             enum AVPixelFormat best= AV_PIX_FMT_NONE;
684             int i;
685             for (i=0; i<link->in_formats->nb_formats; i++) {
686                 enum AVPixelFormat p = link->in_formats->formats[i];
687                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
688             }
689             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
690                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
691                    av_get_pix_fmt_name(ref->format), has_alpha);
692             link->in_formats->formats[0] = best;
693         }
694     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
695         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
696             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
697             int i;
698             for (i=0; i<link->in_formats->nb_formats; i++) {
699                 enum AVSampleFormat p = link->in_formats->formats[i];
700                 best = find_best_sample_fmt_of_2(best, p, ref->format);
701             }
702             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
703                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
704                    av_get_sample_fmt_name(ref->format));
705             link->in_formats->formats[0] = best;
706         }
707     }
708
709     link->in_formats->nb_formats = 1;
710     link->format = link->in_formats->formats[0];
711
712     if (link->type == AVMEDIA_TYPE_AUDIO) {
713         if (!link->in_samplerates->nb_formats) {
714             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
715                    " the link between filters %s and %s.\n", link->src->name,
716                    link->dst->name);
717             return AVERROR(EINVAL);
718         }
719         link->in_samplerates->nb_formats = 1;
720         link->sample_rate = link->in_samplerates->formats[0];
721
722         if (link->in_channel_layouts->all_layouts) {
723             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
724                    " the link between filters %s and %s.\n", link->src->name,
725                    link->dst->name);
726             if (!link->in_channel_layouts->all_counts)
727                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
728                        "supported, try specifying a channel layout using "
729                        "'aformat=channel_layouts=something'.\n");
730             return AVERROR(EINVAL);
731         }
732         link->in_channel_layouts->nb_channel_layouts = 1;
733         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
734         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
735             link->channel_layout = 0;
736         else
737             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
738     }
739
740     ff_formats_unref(&link->in_formats);
741     ff_formats_unref(&link->out_formats);
742     ff_formats_unref(&link->in_samplerates);
743     ff_formats_unref(&link->out_samplerates);
744     ff_channel_layouts_unref(&link->in_channel_layouts);
745     ff_channel_layouts_unref(&link->out_channel_layouts);
746
747     return 0;
748 }
749
750 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
751 do {                                                                   \
752     for (i = 0; i < filter->nb_inputs; i++) {                          \
753         AVFilterLink *link = filter->inputs[i];                        \
754         fmt_type fmt;                                                  \
755                                                                        \
756         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
757             continue;                                                  \
758         fmt = link->out_ ## list->var[0];                              \
759                                                                        \
760         for (j = 0; j < filter->nb_outputs; j++) {                     \
761             AVFilterLink *out_link = filter->outputs[j];               \
762             list_type *fmts;                                           \
763                                                                        \
764             if (link->type != out_link->type ||                        \
765                 out_link->in_ ## list->nb == 1)                        \
766                 continue;                                              \
767             fmts = out_link->in_ ## list;                              \
768                                                                        \
769             if (!out_link->in_ ## list->nb) {                          \
770                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
771                     return ret;                                        \
772                 ret = 1;                                               \
773                 break;                                                 \
774             }                                                          \
775                                                                        \
776             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
777                 if (fmts->var[k] == fmt) {                             \
778                     fmts->var[0]  = fmt;                               \
779                     fmts->nb = 1;                                      \
780                     ret = 1;                                           \
781                     break;                                             \
782                 }                                                      \
783         }                                                              \
784     }                                                                  \
785 } while (0)
786
787 static int reduce_formats_on_filter(AVFilterContext *filter)
788 {
789     int i, j, k, ret = 0;
790
791     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
792                    nb_formats, ff_add_format, ff_formats_unref);
793     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
794                    nb_formats, ff_add_format, ff_formats_unref);
795
796     /* reduce channel layouts */
797     for (i = 0; i < filter->nb_inputs; i++) {
798         AVFilterLink *inlink = filter->inputs[i];
799         uint64_t fmt;
800
801         if (!inlink->out_channel_layouts ||
802             inlink->out_channel_layouts->nb_channel_layouts != 1)
803             continue;
804         fmt = inlink->out_channel_layouts->channel_layouts[0];
805
806         for (j = 0; j < filter->nb_outputs; j++) {
807             AVFilterLink *outlink = filter->outputs[j];
808             AVFilterChannelLayouts *fmts;
809
810             fmts = outlink->in_channel_layouts;
811             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
812                 continue;
813
814             if (fmts->all_layouts &&
815                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
816                 /* Turn the infinite list into a singleton */
817                 fmts->all_layouts = fmts->all_counts  = 0;
818                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
819                     ret = 1;
820                 break;
821             }
822
823             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
824                 if (fmts->channel_layouts[k] == fmt) {
825                     fmts->channel_layouts[0]  = fmt;
826                     fmts->nb_channel_layouts = 1;
827                     ret = 1;
828                     break;
829                 }
830             }
831         }
832     }
833
834     return ret;
835 }
836
837 static int reduce_formats(AVFilterGraph *graph)
838 {
839     int i, reduced, ret;
840
841     do {
842         reduced = 0;
843
844         for (i = 0; i < graph->nb_filters; i++) {
845             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
846                 return ret;
847             reduced |= ret;
848         }
849     } while (reduced);
850
851     return 0;
852 }
853
854 static void swap_samplerates_on_filter(AVFilterContext *filter)
855 {
856     AVFilterLink *link = NULL;
857     int sample_rate;
858     int i, j;
859
860     for (i = 0; i < filter->nb_inputs; i++) {
861         link = filter->inputs[i];
862
863         if (link->type == AVMEDIA_TYPE_AUDIO &&
864             link->out_samplerates->nb_formats== 1)
865             break;
866     }
867     if (i == filter->nb_inputs)
868         return;
869
870     sample_rate = link->out_samplerates->formats[0];
871
872     for (i = 0; i < filter->nb_outputs; i++) {
873         AVFilterLink *outlink = filter->outputs[i];
874         int best_idx, best_diff = INT_MAX;
875
876         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
877             outlink->in_samplerates->nb_formats < 2)
878             continue;
879
880         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
881             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
882
883             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
884
885             if (diff < best_diff) {
886                 best_diff = diff;
887                 best_idx  = j;
888             }
889         }
890         FFSWAP(int, outlink->in_samplerates->formats[0],
891                outlink->in_samplerates->formats[best_idx]);
892     }
893 }
894
895 static void swap_samplerates(AVFilterGraph *graph)
896 {
897     int i;
898
899     for (i = 0; i < graph->nb_filters; i++)
900         swap_samplerates_on_filter(graph->filters[i]);
901 }
902
903 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
904 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
905 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
906 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
907 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
908 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
909 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
910
911 /* allowable substitutions for channel pairs when comparing layouts,
912  * ordered by priority for both values */
913 static const uint64_t ch_subst[][2] = {
914     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
915     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
916     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
917     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
918     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
919     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
920     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
921     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
922     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
923     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
924     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
925     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
926     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
927     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
928     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
929     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
930     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
931     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
932     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
933     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
934     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
935 };
936
937 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
938 {
939     AVFilterLink *link = NULL;
940     int i, j, k;
941
942     for (i = 0; i < filter->nb_inputs; i++) {
943         link = filter->inputs[i];
944
945         if (link->type == AVMEDIA_TYPE_AUDIO &&
946             link->out_channel_layouts->nb_channel_layouts == 1)
947             break;
948     }
949     if (i == filter->nb_inputs)
950         return;
951
952     for (i = 0; i < filter->nb_outputs; i++) {
953         AVFilterLink *outlink = filter->outputs[i];
954         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
955
956         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
957             outlink->in_channel_layouts->nb_channel_layouts < 2)
958             continue;
959
960         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
961             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
962             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
963             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
964             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
965             int count_diff        = out_channels - in_channels;
966             int matched_channels, extra_channels;
967             int score = 100000;
968
969             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
970                 /* Compute score in case the input or output layout encodes
971                    a channel count; in this case the score is not altered by
972                    the computation afterwards, as in_chlayout and
973                    out_chlayout have both been set to 0 */
974                 if (FF_LAYOUT2COUNT(in_chlayout))
975                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
976                 if (FF_LAYOUT2COUNT(out_chlayout))
977                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
978                 score -= 10000 + FFABS(out_channels - in_channels) +
979                          (in_channels > out_channels ? 10000 : 0);
980                 in_chlayout = out_chlayout = 0;
981                 /* Let the remaining computation run, even if the score
982                    value is not altered */
983             }
984
985             /* channel substitution */
986             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
987                 uint64_t cmp0 = ch_subst[k][0];
988                 uint64_t cmp1 = ch_subst[k][1];
989                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
990                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
991                     in_chlayout  &= ~cmp0;
992                     out_chlayout &= ~cmp1;
993                     /* add score for channel match, minus a deduction for
994                        having to do the substitution */
995                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
996                 }
997             }
998
999             /* no penalty for LFE channel mismatch */
1000             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
1001                 (out_chlayout & AV_CH_LOW_FREQUENCY))
1002                 score += 10;
1003             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
1004             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
1005
1006             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
1007                                                                  out_chlayout);
1008             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
1009                                                                  (~in_chlayout));
1010             score += 10 * matched_channels - 5 * extra_channels;
1011
1012             if (score > best_score ||
1013                 (count_diff < best_count_diff && score == best_score)) {
1014                 best_score = score;
1015                 best_idx   = j;
1016                 best_count_diff = count_diff;
1017             }
1018         }
1019         av_assert0(best_idx >= 0);
1020         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1021                outlink->in_channel_layouts->channel_layouts[best_idx]);
1022     }
1023
1024 }
1025
1026 static void swap_channel_layouts(AVFilterGraph *graph)
1027 {
1028     int i;
1029
1030     for (i = 0; i < graph->nb_filters; i++)
1031         swap_channel_layouts_on_filter(graph->filters[i]);
1032 }
1033
1034 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1035 {
1036     AVFilterLink *link = NULL;
1037     int format, bps;
1038     int i, j;
1039
1040     for (i = 0; i < filter->nb_inputs; i++) {
1041         link = filter->inputs[i];
1042
1043         if (link->type == AVMEDIA_TYPE_AUDIO &&
1044             link->out_formats->nb_formats == 1)
1045             break;
1046     }
1047     if (i == filter->nb_inputs)
1048         return;
1049
1050     format = link->out_formats->formats[0];
1051     bps    = av_get_bytes_per_sample(format);
1052
1053     for (i = 0; i < filter->nb_outputs; i++) {
1054         AVFilterLink *outlink = filter->outputs[i];
1055         int best_idx = -1, best_score = INT_MIN;
1056
1057         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1058             outlink->in_formats->nb_formats < 2)
1059             continue;
1060
1061         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1062             int out_format = outlink->in_formats->formats[j];
1063             int out_bps    = av_get_bytes_per_sample(out_format);
1064             int score;
1065
1066             if (av_get_packed_sample_fmt(out_format) == format ||
1067                 av_get_planar_sample_fmt(out_format) == format) {
1068                 best_idx   = j;
1069                 break;
1070             }
1071
1072             /* for s32 and float prefer double to prevent loss of information */
1073             if (bps == 4 && out_bps == 8) {
1074                 best_idx = j;
1075                 break;
1076             }
1077
1078             /* prefer closest higher or equal bps */
1079             score = -abs(out_bps - bps);
1080             if (out_bps >= bps)
1081                 score += INT_MAX/2;
1082
1083             if (score > best_score) {
1084                 best_score = score;
1085                 best_idx   = j;
1086             }
1087         }
1088         av_assert0(best_idx >= 0);
1089         FFSWAP(int, outlink->in_formats->formats[0],
1090                outlink->in_formats->formats[best_idx]);
1091     }
1092 }
1093
1094 static void swap_sample_fmts(AVFilterGraph *graph)
1095 {
1096     int i;
1097
1098     for (i = 0; i < graph->nb_filters; i++)
1099         swap_sample_fmts_on_filter(graph->filters[i]);
1100
1101 }
1102
1103 static int pick_formats(AVFilterGraph *graph)
1104 {
1105     int i, j, ret;
1106     int change;
1107
1108     do{
1109         change = 0;
1110         for (i = 0; i < graph->nb_filters; i++) {
1111             AVFilterContext *filter = graph->filters[i];
1112             if (filter->nb_inputs){
1113                 for (j = 0; j < filter->nb_inputs; j++){
1114                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1115                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1116                             return ret;
1117                         change = 1;
1118                     }
1119                 }
1120             }
1121             if (filter->nb_outputs){
1122                 for (j = 0; j < filter->nb_outputs; j++){
1123                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1124                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1125                             return ret;
1126                         change = 1;
1127                     }
1128                 }
1129             }
1130             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1131                 for (j = 0; j < filter->nb_outputs; j++) {
1132                     if(filter->outputs[j]->format<0) {
1133                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1134                             return ret;
1135                         change = 1;
1136                     }
1137                 }
1138             }
1139         }
1140     }while(change);
1141
1142     for (i = 0; i < graph->nb_filters; i++) {
1143         AVFilterContext *filter = graph->filters[i];
1144
1145         for (j = 0; j < filter->nb_inputs; j++)
1146             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1147                 return ret;
1148         for (j = 0; j < filter->nb_outputs; j++)
1149             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1150                 return ret;
1151     }
1152     return 0;
1153 }
1154
1155 /**
1156  * Configure the formats of all the links in the graph.
1157  */
1158 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1159 {
1160     int ret;
1161
1162     /* find supported formats from sub-filters, and merge along links */
1163     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1164         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1165     if (ret < 0)
1166         return ret;
1167
1168     /* Once everything is merged, it's possible that we'll still have
1169      * multiple valid media format choices. We try to minimize the amount
1170      * of format conversion inside filters */
1171     if ((ret = reduce_formats(graph)) < 0)
1172         return ret;
1173
1174     /* for audio filters, ensure the best format, sample rate and channel layout
1175      * is selected */
1176     swap_sample_fmts(graph);
1177     swap_samplerates(graph);
1178     swap_channel_layouts(graph);
1179
1180     if ((ret = pick_formats(graph)) < 0)
1181         return ret;
1182
1183     return 0;
1184 }
1185
1186 static int graph_config_pointers(AVFilterGraph *graph,
1187                                              AVClass *log_ctx)
1188 {
1189     unsigned i, j;
1190     int sink_links_count = 0, n = 0;
1191     AVFilterContext *f;
1192     AVFilterLink **sinks;
1193
1194     for (i = 0; i < graph->nb_filters; i++) {
1195         f = graph->filters[i];
1196         for (j = 0; j < f->nb_inputs; j++) {
1197             f->inputs[j]->graph     = graph;
1198             f->inputs[j]->age_index = -1;
1199         }
1200         for (j = 0; j < f->nb_outputs; j++) {
1201             f->outputs[j]->graph    = graph;
1202             f->outputs[j]->age_index= -1;
1203         }
1204         if (!f->nb_outputs) {
1205             if (f->nb_inputs > INT_MAX - sink_links_count)
1206                 return AVERROR(EINVAL);
1207             sink_links_count += f->nb_inputs;
1208         }
1209     }
1210     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1211     if (!sinks)
1212         return AVERROR(ENOMEM);
1213     for (i = 0; i < graph->nb_filters; i++) {
1214         f = graph->filters[i];
1215         if (!f->nb_outputs) {
1216             for (j = 0; j < f->nb_inputs; j++) {
1217                 sinks[n] = f->inputs[j];
1218                 f->inputs[j]->age_index = n++;
1219             }
1220         }
1221     }
1222     av_assert0(n == sink_links_count);
1223     graph->sink_links       = sinks;
1224     graph->sink_links_count = sink_links_count;
1225     return 0;
1226 }
1227
1228 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1229 {
1230     AVFilterContext *f;
1231     int i, j, ret;
1232     int fifo_count = 0;
1233
1234     for (i = 0; i < graph->nb_filters; i++) {
1235         f = graph->filters[i];
1236
1237         for (j = 0; j < f->nb_inputs; j++) {
1238             AVFilterLink *link = f->inputs[j];
1239             AVFilterContext *fifo_ctx;
1240             const AVFilter *fifo;
1241             char name[32];
1242
1243             if (!link->dstpad->needs_fifo)
1244                 continue;
1245
1246             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1247                    avfilter_get_by_name("fifo") :
1248                    avfilter_get_by_name("afifo");
1249
1250             snprintf(name, sizeof(name), "auto_fifo_%d", fifo_count++);
1251
1252             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1253                                                NULL, graph);
1254             if (ret < 0)
1255                 return ret;
1256
1257             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1258             if (ret < 0)
1259                 return ret;
1260         }
1261     }
1262
1263     return 0;
1264 }
1265
1266 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1267 {
1268     int ret;
1269
1270     if ((ret = graph_check_validity(graphctx, log_ctx)))
1271         return ret;
1272     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1273         return ret;
1274     if ((ret = graph_config_formats(graphctx, log_ctx)))
1275         return ret;
1276     if ((ret = graph_config_links(graphctx, log_ctx)))
1277         return ret;
1278     if ((ret = graph_check_links(graphctx, log_ctx)))
1279         return ret;
1280     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1281         return ret;
1282
1283     return 0;
1284 }
1285
1286 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1287 {
1288     int i, r = AVERROR(ENOSYS);
1289
1290     if (!graph)
1291         return r;
1292
1293     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1294         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1295         if (r != AVERROR(ENOSYS))
1296             return r;
1297     }
1298
1299     if (res_len && res)
1300         res[0] = 0;
1301
1302     for (i = 0; i < graph->nb_filters; i++) {
1303         AVFilterContext *filter = graph->filters[i];
1304         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1305             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1306             if (r != AVERROR(ENOSYS)) {
1307                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1308                     return r;
1309             }
1310         }
1311     }
1312
1313     return r;
1314 }
1315
1316 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1317 {
1318     int i;
1319
1320     if(!graph)
1321         return 0;
1322
1323     for (i = 0; i < graph->nb_filters; i++) {
1324         AVFilterContext *filter = graph->filters[i];
1325         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1326             AVFilterCommand **queue = &filter->command_queue, *next;
1327             while (*queue && (*queue)->time <= ts)
1328                 queue = &(*queue)->next;
1329             next = *queue;
1330             *queue = av_mallocz(sizeof(AVFilterCommand));
1331             if (!*queue)
1332                 return AVERROR(ENOMEM);
1333
1334             (*queue)->command = av_strdup(command);
1335             (*queue)->arg     = av_strdup(arg);
1336             (*queue)->time    = ts;
1337             (*queue)->flags   = flags;
1338             (*queue)->next    = next;
1339             if(flags & AVFILTER_CMD_FLAG_ONE)
1340                 return 0;
1341         }
1342     }
1343
1344     return 0;
1345 }
1346
1347 static void heap_bubble_up(AVFilterGraph *graph,
1348                            AVFilterLink *link, int index)
1349 {
1350     AVFilterLink **links = graph->sink_links;
1351
1352     av_assert0(index >= 0);
1353
1354     while (index) {
1355         int parent = (index - 1) >> 1;
1356         if (links[parent]->current_pts_us >= link->current_pts_us)
1357             break;
1358         links[index] = links[parent];
1359         links[index]->age_index = index;
1360         index = parent;
1361     }
1362     links[index] = link;
1363     link->age_index = index;
1364 }
1365
1366 static void heap_bubble_down(AVFilterGraph *graph,
1367                              AVFilterLink *link, int index)
1368 {
1369     AVFilterLink **links = graph->sink_links;
1370
1371     av_assert0(index >= 0);
1372
1373     while (1) {
1374         int child = 2 * index + 1;
1375         if (child >= graph->sink_links_count)
1376             break;
1377         if (child + 1 < graph->sink_links_count &&
1378             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1379             child++;
1380         if (link->current_pts_us < links[child]->current_pts_us)
1381             break;
1382         links[index] = links[child];
1383         links[index]->age_index = index;
1384         index = child;
1385     }
1386     links[index] = link;
1387     link->age_index = index;
1388 }
1389
1390 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1391 {
1392     heap_bubble_up  (graph, link, link->age_index);
1393     heap_bubble_down(graph, link, link->age_index);
1394 }
1395
1396 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1397 {
1398     AVFilterLink *oldest = graph->sink_links[0];
1399     int64_t frame_count;
1400     int r;
1401
1402     while (graph->sink_links_count) {
1403         oldest = graph->sink_links[0];
1404         if (oldest->dst->filter->activate) {
1405             /* For now, buffersink is the only filter implementing activate. */
1406             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1407                                               AV_BUFFERSINK_FLAG_PEEK);
1408             if (r != AVERROR_EOF)
1409                 return r;
1410         } else {
1411             r = ff_request_frame(oldest);
1412         }
1413         if (r != AVERROR_EOF)
1414             break;
1415         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1416                oldest->dst ? oldest->dst->name : "unknown",
1417                oldest->dstpad ? oldest->dstpad->name : "unknown");
1418         /* EOF: remove the link from the heap */
1419         if (oldest->age_index < --graph->sink_links_count)
1420             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1421                              oldest->age_index);
1422         oldest->age_index = -1;
1423     }
1424     if (!graph->sink_links_count)
1425         return AVERROR_EOF;
1426     av_assert1(!oldest->dst->filter->activate);
1427     av_assert1(oldest->age_index >= 0);
1428     frame_count = oldest->frame_count_out;
1429     while (frame_count == oldest->frame_count_out) {
1430         r = ff_filter_graph_run_once(graph);
1431         if (r == AVERROR(EAGAIN) &&
1432             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1433             !oldest->status_in)
1434             ff_request_frame(oldest);
1435         else if (r < 0)
1436             return r;
1437     }
1438     return 0;
1439 }
1440
1441 int ff_filter_graph_run_once(AVFilterGraph *graph)
1442 {
1443     AVFilterContext *filter;
1444     unsigned i;
1445
1446     av_assert0(graph->nb_filters);
1447     filter = graph->filters[0];
1448     for (i = 1; i < graph->nb_filters; i++)
1449         if (graph->filters[i]->ready > filter->ready)
1450             filter = graph->filters[i];
1451     if (!filter->ready)
1452         return AVERROR(EAGAIN);
1453     return ff_filter_activate(filter);
1454 }