lavfi: make request_frame() non-recursive.
[ffmpeg.git] / libavfilter / avfiltergraph.c
1 /*
2  * filter graphs
3  * Copyright (c) 2008 Vitor Sessak
4  * Copyright (c) 2007 Bobby Bingham
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #include "config.h"
24
25 #include <string.h>
26
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/bprint.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34
35 #include "avfilter.h"
36 #include "formats.h"
37 #include "internal.h"
38 #include "thread.h"
39
40 #define OFFSET(x) offsetof(AVFilterGraph, x)
41 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
42 static const AVOption filtergraph_options[] = {
43     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
44         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
45         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
46     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
47         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
48     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
49         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
50     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
51         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
52     { NULL },
53 };
54
55 static const AVClass filtergraph_class = {
56     .class_name = "AVFilterGraph",
57     .item_name  = av_default_item_name,
58     .version    = LIBAVUTIL_VERSION_INT,
59     .option     = filtergraph_options,
60     .category   = AV_CLASS_CATEGORY_FILTER,
61 };
62
63 #if !HAVE_THREADS
64 void ff_graph_thread_free(AVFilterGraph *graph)
65 {
66 }
67
68 int ff_graph_thread_init(AVFilterGraph *graph)
69 {
70     graph->thread_type = 0;
71     graph->nb_threads  = 1;
72     return 0;
73 }
74 #endif
75
76 AVFilterGraph *avfilter_graph_alloc(void)
77 {
78     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
79     if (!ret)
80         return NULL;
81
82     ret->internal = av_mallocz(sizeof(*ret->internal));
83     if (!ret->internal) {
84         av_freep(&ret);
85         return NULL;
86     }
87
88     ret->av_class = &filtergraph_class;
89     av_opt_set_defaults(ret);
90
91     return ret;
92 }
93
94 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
95 {
96     int i;
97     for (i = 0; i < graph->nb_filters; i++) {
98         if (graph->filters[i] == filter) {
99             FFSWAP(AVFilterContext*, graph->filters[i],
100                    graph->filters[graph->nb_filters - 1]);
101             graph->nb_filters--;
102             return;
103         }
104     }
105 }
106
107 void avfilter_graph_free(AVFilterGraph **graph)
108 {
109     if (!*graph)
110         return;
111
112     while ((*graph)->nb_filters)
113         avfilter_free((*graph)->filters[0]);
114
115     ff_graph_thread_free(*graph);
116
117     av_freep(&(*graph)->sink_links);
118
119     av_freep(&(*graph)->scale_sws_opts);
120     av_freep(&(*graph)->aresample_swr_opts);
121     av_freep(&(*graph)->resample_lavr_opts);
122     av_freep(&(*graph)->filters);
123     av_freep(&(*graph)->internal);
124     av_freep(graph);
125 }
126
127 #if FF_API_AVFILTER_OPEN
128 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
129 {
130     AVFilterContext **filters = av_realloc(graph->filters,
131                                            sizeof(*filters) * (graph->nb_filters + 1));
132     if (!filters)
133         return AVERROR(ENOMEM);
134
135     graph->filters = filters;
136     graph->filters[graph->nb_filters++] = filter;
137
138     filter->graph = graph;
139
140     return 0;
141 }
142 #endif
143
144 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
145                                  const char *name, const char *args, void *opaque,
146                                  AVFilterGraph *graph_ctx)
147 {
148     int ret;
149
150     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
151     if (!*filt_ctx)
152         return AVERROR(ENOMEM);
153
154     ret = avfilter_init_str(*filt_ctx, args);
155     if (ret < 0)
156         goto fail;
157
158     return 0;
159
160 fail:
161     if (*filt_ctx)
162         avfilter_free(*filt_ctx);
163     *filt_ctx = NULL;
164     return ret;
165 }
166
167 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
168 {
169     graph->disable_auto_convert = flags;
170 }
171
172 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
173                                              const AVFilter *filter,
174                                              const char *name)
175 {
176     AVFilterContext **filters, *s;
177
178     if (graph->thread_type && !graph->internal->thread_execute) {
179         if (graph->execute) {
180             graph->internal->thread_execute = graph->execute;
181         } else {
182             int ret = ff_graph_thread_init(graph);
183             if (ret < 0) {
184                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
185                 return NULL;
186             }
187         }
188     }
189
190     s = ff_filter_alloc(filter, name);
191     if (!s)
192         return NULL;
193
194     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
195     if (!filters) {
196         avfilter_free(s);
197         return NULL;
198     }
199
200     graph->filters = filters;
201     graph->filters[graph->nb_filters++] = s;
202
203     s->graph = graph;
204
205     return s;
206 }
207
208 /**
209  * Check for the validity of graph.
210  *
211  * A graph is considered valid if all its input and output pads are
212  * connected.
213  *
214  * @return >= 0 in case of success, a negative value otherwise
215  */
216 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
217 {
218     AVFilterContext *filt;
219     int i, j;
220
221     for (i = 0; i < graph->nb_filters; i++) {
222         const AVFilterPad *pad;
223         filt = graph->filters[i];
224
225         for (j = 0; j < filt->nb_inputs; j++) {
226             if (!filt->inputs[j] || !filt->inputs[j]->src) {
227                 pad = &filt->input_pads[j];
228                 av_log(log_ctx, AV_LOG_ERROR,
229                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
230                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
231                 return AVERROR(EINVAL);
232             }
233         }
234
235         for (j = 0; j < filt->nb_outputs; j++) {
236             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
237                 pad = &filt->output_pads[j];
238                 av_log(log_ctx, AV_LOG_ERROR,
239                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
240                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
241                 return AVERROR(EINVAL);
242             }
243         }
244     }
245
246     return 0;
247 }
248
249 /**
250  * Configure all the links of graphctx.
251  *
252  * @return >= 0 in case of success, a negative value otherwise
253  */
254 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
255 {
256     AVFilterContext *filt;
257     int i, ret;
258
259     for (i = 0; i < graph->nb_filters; i++) {
260         filt = graph->filters[i];
261
262         if (!filt->nb_outputs) {
263             if ((ret = avfilter_config_links(filt)))
264                 return ret;
265         }
266     }
267
268     return 0;
269 }
270
271 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
272 {
273     int i;
274
275     for (i = 0; i < graph->nb_filters; i++)
276         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
277             return graph->filters[i];
278
279     return NULL;
280 }
281
282 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
283 {
284     if (!l)
285         return;
286     if (l->nb_channel_layouts) {
287         if (l->all_layouts || l->all_counts)
288             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
289         l->all_layouts = l->all_counts = 0;
290     } else {
291         if (l->all_counts && !l->all_layouts)
292             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
293         l->all_layouts = 1;
294     }
295 }
296
297 static int filter_query_formats(AVFilterContext *ctx)
298 {
299     int ret, i;
300     AVFilterFormats *formats;
301     AVFilterChannelLayouts *chlayouts;
302     AVFilterFormats *samplerates;
303     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
304                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
305                             AVMEDIA_TYPE_VIDEO;
306
307     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
308         if (ret != AVERROR(EAGAIN))
309             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
310                    ctx->name, av_err2str(ret));
311         return ret;
312     }
313
314     for (i = 0; i < ctx->nb_inputs; i++)
315         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
316     for (i = 0; i < ctx->nb_outputs; i++)
317         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
318
319     formats = ff_all_formats(type);
320     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
321         return ret;
322     if (type == AVMEDIA_TYPE_AUDIO) {
323         samplerates = ff_all_samplerates();
324         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
325             return ret;
326         chlayouts = ff_all_channel_layouts();
327         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
328             return ret;
329     }
330     return 0;
331 }
332
333 static int formats_declared(AVFilterContext *f)
334 {
335     int i;
336
337     for (i = 0; i < f->nb_inputs; i++) {
338         if (!f->inputs[i]->out_formats)
339             return 0;
340         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
341             !(f->inputs[i]->out_samplerates &&
342               f->inputs[i]->out_channel_layouts))
343             return 0;
344     }
345     for (i = 0; i < f->nb_outputs; i++) {
346         if (!f->outputs[i]->in_formats)
347             return 0;
348         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
349             !(f->outputs[i]->in_samplerates &&
350               f->outputs[i]->in_channel_layouts))
351             return 0;
352     }
353     return 1;
354 }
355
356 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
357 {
358     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
359     if (a) {
360         a->refcount = 0;
361         a->refs     = NULL;
362         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
363         if (!a->formats && arg->formats)
364             av_freep(&a);
365     }
366     return a;
367 }
368
369 static int can_merge_formats(AVFilterFormats *a_arg,
370                              AVFilterFormats *b_arg,
371                              enum AVMediaType type,
372                              int is_sample_rate)
373 {
374     AVFilterFormats *a, *b, *ret;
375     if (a_arg == b_arg)
376         return 1;
377     a = clone_filter_formats(a_arg);
378     b = clone_filter_formats(b_arg);
379
380     if (!a || !b) {
381         if (a)
382             av_freep(&a->formats);
383         if (b)
384             av_freep(&b->formats);
385
386         av_freep(&a);
387         av_freep(&b);
388
389         return 0;
390     }
391
392     if (is_sample_rate) {
393         ret = ff_merge_samplerates(a, b);
394     } else {
395         ret = ff_merge_formats(a, b, type);
396     }
397     if (ret) {
398         av_freep(&ret->formats);
399         av_freep(&ret->refs);
400         av_freep(&ret);
401         return 1;
402     } else {
403         av_freep(&a->formats);
404         av_freep(&b->formats);
405         av_freep(&a);
406         av_freep(&b);
407         return 0;
408     }
409 }
410
411 /**
412  * Perform one round of query_formats() and merging formats lists on the
413  * filter graph.
414  * @return  >=0 if all links formats lists could be queried and merged;
415  *          AVERROR(EAGAIN) some progress was made in the queries or merging
416  *          and a later call may succeed;
417  *          AVERROR(EIO) (may be changed) plus a log message if no progress
418  *          was made and the negotiation is stuck;
419  *          a negative error code if some other error happened
420  */
421 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
422 {
423     int i, j, ret;
424     int scaler_count = 0, resampler_count = 0;
425     int count_queried = 0;        /* successful calls to query_formats() */
426     int count_merged = 0;         /* successful merge of formats lists */
427     int count_already_merged = 0; /* lists already merged */
428     int count_delayed = 0;        /* lists that need to be merged later */
429
430     for (i = 0; i < graph->nb_filters; i++) {
431         AVFilterContext *f = graph->filters[i];
432         if (formats_declared(f))
433             continue;
434         if (f->filter->query_formats)
435             ret = filter_query_formats(f);
436         else
437             ret = ff_default_query_formats(f);
438         if (ret < 0 && ret != AVERROR(EAGAIN))
439             return ret;
440         /* note: EAGAIN could indicate a partial success, not counted yet */
441         count_queried += ret >= 0;
442     }
443
444     /* go through and merge as many format lists as possible */
445     for (i = 0; i < graph->nb_filters; i++) {
446         AVFilterContext *filter = graph->filters[i];
447
448         for (j = 0; j < filter->nb_inputs; j++) {
449             AVFilterLink *link = filter->inputs[j];
450             int convert_needed = 0;
451
452             if (!link)
453                 continue;
454
455             if (link->in_formats != link->out_formats
456                 && link->in_formats && link->out_formats)
457                 if (!can_merge_formats(link->in_formats, link->out_formats,
458                                       link->type, 0))
459                     convert_needed = 1;
460             if (link->type == AVMEDIA_TYPE_AUDIO) {
461                 if (link->in_samplerates != link->out_samplerates
462                     && link->in_samplerates && link->out_samplerates)
463                     if (!can_merge_formats(link->in_samplerates,
464                                            link->out_samplerates,
465                                            0, 1))
466                         convert_needed = 1;
467             }
468
469 #define MERGE_DISPATCH(field, statement)                                     \
470             if (!(link->in_ ## field && link->out_ ## field)) {              \
471                 count_delayed++;                                             \
472             } else if (link->in_ ## field == link->out_ ## field) {          \
473                 count_already_merged++;                                      \
474             } else if (!convert_needed) {                                    \
475                 count_merged++;                                              \
476                 statement                                                    \
477             }
478
479             if (link->type == AVMEDIA_TYPE_AUDIO) {
480                 MERGE_DISPATCH(channel_layouts,
481                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
482                                                   link->out_channel_layouts))
483                         convert_needed = 1;
484                 )
485                 MERGE_DISPATCH(samplerates,
486                     if (!ff_merge_samplerates(link->in_samplerates,
487                                               link->out_samplerates))
488                         convert_needed = 1;
489                 )
490             }
491             MERGE_DISPATCH(formats,
492                 if (!ff_merge_formats(link->in_formats, link->out_formats,
493                                       link->type))
494                     convert_needed = 1;
495             )
496 #undef MERGE_DISPATCH
497
498             if (convert_needed) {
499                 AVFilterContext *convert;
500                 AVFilter *filter;
501                 AVFilterLink *inlink, *outlink;
502                 char scale_args[256];
503                 char inst_name[30];
504
505                 /* couldn't merge format lists. auto-insert conversion filter */
506                 switch (link->type) {
507                 case AVMEDIA_TYPE_VIDEO:
508                     if (!(filter = avfilter_get_by_name("scale"))) {
509                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
510                                "not present, cannot convert pixel formats.\n");
511                         return AVERROR(EINVAL);
512                     }
513
514                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
515                              scaler_count++);
516
517                     if ((ret = avfilter_graph_create_filter(&convert, filter,
518                                                             inst_name, graph->scale_sws_opts, NULL,
519                                                             graph)) < 0)
520                         return ret;
521                     break;
522                 case AVMEDIA_TYPE_AUDIO:
523                     if (!(filter = avfilter_get_by_name("aresample"))) {
524                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
525                                "not present, cannot convert audio formats.\n");
526                         return AVERROR(EINVAL);
527                     }
528
529                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
530                              resampler_count++);
531                     scale_args[0] = '\0';
532                     if (graph->aresample_swr_opts)
533                         snprintf(scale_args, sizeof(scale_args), "%s",
534                                  graph->aresample_swr_opts);
535                     if ((ret = avfilter_graph_create_filter(&convert, filter,
536                                                             inst_name, graph->aresample_swr_opts,
537                                                             NULL, graph)) < 0)
538                         return ret;
539                     break;
540                 default:
541                     return AVERROR(EINVAL);
542                 }
543
544                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
545                     return ret;
546
547                 if ((ret = filter_query_formats(convert)) < 0)
548                     return ret;
549
550                 inlink  = convert->inputs[0];
551                 outlink = convert->outputs[0];
552                 av_assert0( inlink-> in_formats->refcount > 0);
553                 av_assert0( inlink->out_formats->refcount > 0);
554                 av_assert0(outlink-> in_formats->refcount > 0);
555                 av_assert0(outlink->out_formats->refcount > 0);
556                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
557                     av_assert0( inlink-> in_samplerates->refcount > 0);
558                     av_assert0( inlink->out_samplerates->refcount > 0);
559                     av_assert0(outlink-> in_samplerates->refcount > 0);
560                     av_assert0(outlink->out_samplerates->refcount > 0);
561                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
562                     av_assert0( inlink->out_channel_layouts->refcount > 0);
563                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
564                     av_assert0(outlink->out_channel_layouts->refcount > 0);
565                 }
566                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
567                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
568                     ret = AVERROR(ENOSYS);
569                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
570                     (!ff_merge_samplerates(inlink->in_samplerates,
571                                            inlink->out_samplerates) ||
572                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
573                                                inlink->out_channel_layouts)))
574                     ret = AVERROR(ENOSYS);
575                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
576                     (!ff_merge_samplerates(outlink->in_samplerates,
577                                            outlink->out_samplerates) ||
578                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
579                                                outlink->out_channel_layouts)))
580                     ret = AVERROR(ENOSYS);
581
582                 if (ret < 0) {
583                     av_log(log_ctx, AV_LOG_ERROR,
584                            "Impossible to convert between the formats supported by the filter "
585                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
586                     return ret;
587                 }
588             }
589         }
590     }
591
592     av_log(graph, AV_LOG_DEBUG, "query_formats: "
593            "%d queried, %d merged, %d already done, %d delayed\n",
594            count_queried, count_merged, count_already_merged, count_delayed);
595     if (count_delayed) {
596         AVBPrint bp;
597
598         /* if count_queried > 0, one filter at least did set its formats,
599            that will give additional information to its neighbour;
600            if count_merged > 0, one pair of formats lists at least was merged,
601            that will give additional information to all connected filters;
602            in both cases, progress was made and a new round must be done */
603         if (count_queried || count_merged)
604             return AVERROR(EAGAIN);
605         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
606         for (i = 0; i < graph->nb_filters; i++)
607             if (!formats_declared(graph->filters[i]))
608                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
609                           graph->filters[i]->name);
610         av_log(graph, AV_LOG_ERROR,
611                "The following filters could not choose their formats: %s\n"
612                "Consider inserting the (a)format filter near their input or "
613                "output.\n", bp.str);
614         return AVERROR(EIO);
615     }
616     return 0;
617 }
618
619 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
620 {
621     int score = 0;
622
623     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
624         score ++;
625
626     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
627         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
628     }else
629         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
630
631     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
632         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
633         score += 20;
634
635     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
636         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
637         score += 2;
638
639     return score;
640 }
641
642 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
643                                                      enum AVSampleFormat src_fmt)
644 {
645     int score1, score2;
646
647     score1 = get_fmt_score(dst_fmt1, src_fmt);
648     score2 = get_fmt_score(dst_fmt2, src_fmt);
649
650     return score1 < score2 ? dst_fmt1 : dst_fmt2;
651 }
652
653 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
654 {
655     if (!link || !link->in_formats)
656         return 0;
657
658     if (link->type == AVMEDIA_TYPE_VIDEO) {
659         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
660             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
661             enum AVPixelFormat best= AV_PIX_FMT_NONE;
662             int i;
663             for (i=0; i<link->in_formats->nb_formats; i++) {
664                 enum AVPixelFormat p = link->in_formats->formats[i];
665                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
666             }
667             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
668                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
669                    av_get_pix_fmt_name(ref->format), has_alpha);
670             link->in_formats->formats[0] = best;
671         }
672     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
673         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
674             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
675             int i;
676             for (i=0; i<link->in_formats->nb_formats; i++) {
677                 enum AVSampleFormat p = link->in_formats->formats[i];
678                 best = find_best_sample_fmt_of_2(best, p, ref->format);
679             }
680             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
681                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
682                    av_get_sample_fmt_name(ref->format));
683             link->in_formats->formats[0] = best;
684         }
685     }
686
687     link->in_formats->nb_formats = 1;
688     link->format = link->in_formats->formats[0];
689
690     if (link->type == AVMEDIA_TYPE_AUDIO) {
691         if (!link->in_samplerates->nb_formats) {
692             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
693                    " the link between filters %s and %s.\n", link->src->name,
694                    link->dst->name);
695             return AVERROR(EINVAL);
696         }
697         link->in_samplerates->nb_formats = 1;
698         link->sample_rate = link->in_samplerates->formats[0];
699
700         if (link->in_channel_layouts->all_layouts) {
701             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
702                    " the link between filters %s and %s.\n", link->src->name,
703                    link->dst->name);
704             if (!link->in_channel_layouts->all_counts)
705                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
706                        "supported, try specifying a channel layout using "
707                        "'aformat=channel_layouts=something'.\n");
708             return AVERROR(EINVAL);
709         }
710         link->in_channel_layouts->nb_channel_layouts = 1;
711         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
712         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
713             link->channel_layout = 0;
714         else
715             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
716     }
717
718     ff_formats_unref(&link->in_formats);
719     ff_formats_unref(&link->out_formats);
720     ff_formats_unref(&link->in_samplerates);
721     ff_formats_unref(&link->out_samplerates);
722     ff_channel_layouts_unref(&link->in_channel_layouts);
723     ff_channel_layouts_unref(&link->out_channel_layouts);
724
725     return 0;
726 }
727
728 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
729 do {                                                                   \
730     for (i = 0; i < filter->nb_inputs; i++) {                          \
731         AVFilterLink *link = filter->inputs[i];                        \
732         fmt_type fmt;                                                  \
733                                                                        \
734         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
735             continue;                                                  \
736         fmt = link->out_ ## list->var[0];                              \
737                                                                        \
738         for (j = 0; j < filter->nb_outputs; j++) {                     \
739             AVFilterLink *out_link = filter->outputs[j];               \
740             list_type *fmts;                                           \
741                                                                        \
742             if (link->type != out_link->type ||                        \
743                 out_link->in_ ## list->nb == 1)                        \
744                 continue;                                              \
745             fmts = out_link->in_ ## list;                              \
746                                                                        \
747             if (!out_link->in_ ## list->nb) {                          \
748                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
749                     return ret;                                        \
750                 ret = 1;                                               \
751                 break;                                                 \
752             }                                                          \
753                                                                        \
754             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
755                 if (fmts->var[k] == fmt) {                             \
756                     fmts->var[0]  = fmt;                               \
757                     fmts->nb = 1;                                      \
758                     ret = 1;                                           \
759                     break;                                             \
760                 }                                                      \
761         }                                                              \
762     }                                                                  \
763 } while (0)
764
765 static int reduce_formats_on_filter(AVFilterContext *filter)
766 {
767     int i, j, k, ret = 0;
768
769     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
770                    nb_formats, ff_add_format, ff_formats_unref);
771     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
772                    nb_formats, ff_add_format, ff_formats_unref);
773
774     /* reduce channel layouts */
775     for (i = 0; i < filter->nb_inputs; i++) {
776         AVFilterLink *inlink = filter->inputs[i];
777         uint64_t fmt;
778
779         if (!inlink->out_channel_layouts ||
780             inlink->out_channel_layouts->nb_channel_layouts != 1)
781             continue;
782         fmt = inlink->out_channel_layouts->channel_layouts[0];
783
784         for (j = 0; j < filter->nb_outputs; j++) {
785             AVFilterLink *outlink = filter->outputs[j];
786             AVFilterChannelLayouts *fmts;
787
788             fmts = outlink->in_channel_layouts;
789             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
790                 continue;
791
792             if (fmts->all_layouts &&
793                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
794                 /* Turn the infinite list into a singleton */
795                 fmts->all_layouts = fmts->all_counts  = 0;
796                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
797                     ret = 1;
798                 break;
799             }
800
801             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
802                 if (fmts->channel_layouts[k] == fmt) {
803                     fmts->channel_layouts[0]  = fmt;
804                     fmts->nb_channel_layouts = 1;
805                     ret = 1;
806                     break;
807                 }
808             }
809         }
810     }
811
812     return ret;
813 }
814
815 static int reduce_formats(AVFilterGraph *graph)
816 {
817     int i, reduced, ret;
818
819     do {
820         reduced = 0;
821
822         for (i = 0; i < graph->nb_filters; i++) {
823             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
824                 return ret;
825             reduced |= ret;
826         }
827     } while (reduced);
828
829     return 0;
830 }
831
832 static void swap_samplerates_on_filter(AVFilterContext *filter)
833 {
834     AVFilterLink *link = NULL;
835     int sample_rate;
836     int i, j;
837
838     for (i = 0; i < filter->nb_inputs; i++) {
839         link = filter->inputs[i];
840
841         if (link->type == AVMEDIA_TYPE_AUDIO &&
842             link->out_samplerates->nb_formats== 1)
843             break;
844     }
845     if (i == filter->nb_inputs)
846         return;
847
848     sample_rate = link->out_samplerates->formats[0];
849
850     for (i = 0; i < filter->nb_outputs; i++) {
851         AVFilterLink *outlink = filter->outputs[i];
852         int best_idx, best_diff = INT_MAX;
853
854         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
855             outlink->in_samplerates->nb_formats < 2)
856             continue;
857
858         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
859             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
860
861             if (diff < best_diff) {
862                 best_diff = diff;
863                 best_idx  = j;
864             }
865         }
866         FFSWAP(int, outlink->in_samplerates->formats[0],
867                outlink->in_samplerates->formats[best_idx]);
868     }
869 }
870
871 static void swap_samplerates(AVFilterGraph *graph)
872 {
873     int i;
874
875     for (i = 0; i < graph->nb_filters; i++)
876         swap_samplerates_on_filter(graph->filters[i]);
877 }
878
879 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
880 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
881 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
882 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
883 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
884 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
885 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
886
887 /* allowable substitutions for channel pairs when comparing layouts,
888  * ordered by priority for both values */
889 static const uint64_t ch_subst[][2] = {
890     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
891     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
892     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
893     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
894     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
895     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
896     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
897     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
898     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
899     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
900     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
901     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
902     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
903     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
904     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
905     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
906     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
907     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
908     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
909     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
910     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
911 };
912
913 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
914 {
915     AVFilterLink *link = NULL;
916     int i, j, k;
917
918     for (i = 0; i < filter->nb_inputs; i++) {
919         link = filter->inputs[i];
920
921         if (link->type == AVMEDIA_TYPE_AUDIO &&
922             link->out_channel_layouts->nb_channel_layouts == 1)
923             break;
924     }
925     if (i == filter->nb_inputs)
926         return;
927
928     for (i = 0; i < filter->nb_outputs; i++) {
929         AVFilterLink *outlink = filter->outputs[i];
930         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
931
932         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
933             outlink->in_channel_layouts->nb_channel_layouts < 2)
934             continue;
935
936         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
937             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
938             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
939             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
940             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
941             int count_diff        = out_channels - in_channels;
942             int matched_channels, extra_channels;
943             int score = 100000;
944
945             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
946                 /* Compute score in case the input or output layout encodes
947                    a channel count; in this case the score is not altered by
948                    the computation afterwards, as in_chlayout and
949                    out_chlayout have both been set to 0 */
950                 if (FF_LAYOUT2COUNT(in_chlayout))
951                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
952                 if (FF_LAYOUT2COUNT(out_chlayout))
953                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
954                 score -= 10000 + FFABS(out_channels - in_channels) +
955                          (in_channels > out_channels ? 10000 : 0);
956                 in_chlayout = out_chlayout = 0;
957                 /* Let the remaining computation run, even if the score
958                    value is not altered */
959             }
960
961             /* channel substitution */
962             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
963                 uint64_t cmp0 = ch_subst[k][0];
964                 uint64_t cmp1 = ch_subst[k][1];
965                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
966                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
967                     in_chlayout  &= ~cmp0;
968                     out_chlayout &= ~cmp1;
969                     /* add score for channel match, minus a deduction for
970                        having to do the substitution */
971                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
972                 }
973             }
974
975             /* no penalty for LFE channel mismatch */
976             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
977                 (out_chlayout & AV_CH_LOW_FREQUENCY))
978                 score += 10;
979             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
980             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
981
982             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
983                                                                  out_chlayout);
984             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
985                                                                  (~in_chlayout));
986             score += 10 * matched_channels - 5 * extra_channels;
987
988             if (score > best_score ||
989                 (count_diff < best_count_diff && score == best_score)) {
990                 best_score = score;
991                 best_idx   = j;
992                 best_count_diff = count_diff;
993             }
994         }
995         av_assert0(best_idx >= 0);
996         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
997                outlink->in_channel_layouts->channel_layouts[best_idx]);
998     }
999
1000 }
1001
1002 static void swap_channel_layouts(AVFilterGraph *graph)
1003 {
1004     int i;
1005
1006     for (i = 0; i < graph->nb_filters; i++)
1007         swap_channel_layouts_on_filter(graph->filters[i]);
1008 }
1009
1010 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1011 {
1012     AVFilterLink *link = NULL;
1013     int format, bps;
1014     int i, j;
1015
1016     for (i = 0; i < filter->nb_inputs; i++) {
1017         link = filter->inputs[i];
1018
1019         if (link->type == AVMEDIA_TYPE_AUDIO &&
1020             link->out_formats->nb_formats == 1)
1021             break;
1022     }
1023     if (i == filter->nb_inputs)
1024         return;
1025
1026     format = link->out_formats->formats[0];
1027     bps    = av_get_bytes_per_sample(format);
1028
1029     for (i = 0; i < filter->nb_outputs; i++) {
1030         AVFilterLink *outlink = filter->outputs[i];
1031         int best_idx = -1, best_score = INT_MIN;
1032
1033         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1034             outlink->in_formats->nb_formats < 2)
1035             continue;
1036
1037         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1038             int out_format = outlink->in_formats->formats[j];
1039             int out_bps    = av_get_bytes_per_sample(out_format);
1040             int score;
1041
1042             if (av_get_packed_sample_fmt(out_format) == format ||
1043                 av_get_planar_sample_fmt(out_format) == format) {
1044                 best_idx   = j;
1045                 break;
1046             }
1047
1048             /* for s32 and float prefer double to prevent loss of information */
1049             if (bps == 4 && out_bps == 8) {
1050                 best_idx = j;
1051                 break;
1052             }
1053
1054             /* prefer closest higher or equal bps */
1055             score = -abs(out_bps - bps);
1056             if (out_bps >= bps)
1057                 score += INT_MAX/2;
1058
1059             if (score > best_score) {
1060                 best_score = score;
1061                 best_idx   = j;
1062             }
1063         }
1064         av_assert0(best_idx >= 0);
1065         FFSWAP(int, outlink->in_formats->formats[0],
1066                outlink->in_formats->formats[best_idx]);
1067     }
1068 }
1069
1070 static void swap_sample_fmts(AVFilterGraph *graph)
1071 {
1072     int i;
1073
1074     for (i = 0; i < graph->nb_filters; i++)
1075         swap_sample_fmts_on_filter(graph->filters[i]);
1076
1077 }
1078
1079 static int pick_formats(AVFilterGraph *graph)
1080 {
1081     int i, j, ret;
1082     int change;
1083
1084     do{
1085         change = 0;
1086         for (i = 0; i < graph->nb_filters; i++) {
1087             AVFilterContext *filter = graph->filters[i];
1088             if (filter->nb_inputs){
1089                 for (j = 0; j < filter->nb_inputs; j++){
1090                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1091                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1092                             return ret;
1093                         change = 1;
1094                     }
1095                 }
1096             }
1097             if (filter->nb_outputs){
1098                 for (j = 0; j < filter->nb_outputs; j++){
1099                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1100                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1101                             return ret;
1102                         change = 1;
1103                     }
1104                 }
1105             }
1106             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1107                 for (j = 0; j < filter->nb_outputs; j++) {
1108                     if(filter->outputs[j]->format<0) {
1109                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1110                             return ret;
1111                         change = 1;
1112                     }
1113                 }
1114             }
1115         }
1116     }while(change);
1117
1118     for (i = 0; i < graph->nb_filters; i++) {
1119         AVFilterContext *filter = graph->filters[i];
1120
1121         for (j = 0; j < filter->nb_inputs; j++)
1122             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1123                 return ret;
1124         for (j = 0; j < filter->nb_outputs; j++)
1125             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1126                 return ret;
1127     }
1128     return 0;
1129 }
1130
1131 /**
1132  * Configure the formats of all the links in the graph.
1133  */
1134 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1135 {
1136     int ret;
1137
1138     /* find supported formats from sub-filters, and merge along links */
1139     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1140         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1141     if (ret < 0)
1142         return ret;
1143
1144     /* Once everything is merged, it's possible that we'll still have
1145      * multiple valid media format choices. We try to minimize the amount
1146      * of format conversion inside filters */
1147     if ((ret = reduce_formats(graph)) < 0)
1148         return ret;
1149
1150     /* for audio filters, ensure the best format, sample rate and channel layout
1151      * is selected */
1152     swap_sample_fmts(graph);
1153     swap_samplerates(graph);
1154     swap_channel_layouts(graph);
1155
1156     if ((ret = pick_formats(graph)) < 0)
1157         return ret;
1158
1159     return 0;
1160 }
1161
1162 static int graph_config_pointers(AVFilterGraph *graph,
1163                                              AVClass *log_ctx)
1164 {
1165     unsigned i, j;
1166     int sink_links_count = 0, n = 0;
1167     AVFilterContext *f;
1168     AVFilterLink **sinks;
1169
1170     for (i = 0; i < graph->nb_filters; i++) {
1171         f = graph->filters[i];
1172         for (j = 0; j < f->nb_inputs; j++) {
1173             f->inputs[j]->graph     = graph;
1174             f->inputs[j]->age_index = -1;
1175         }
1176         for (j = 0; j < f->nb_outputs; j++) {
1177             f->outputs[j]->graph    = graph;
1178             f->outputs[j]->age_index= -1;
1179         }
1180         if (!f->nb_outputs) {
1181             if (f->nb_inputs > INT_MAX - sink_links_count)
1182                 return AVERROR(EINVAL);
1183             sink_links_count += f->nb_inputs;
1184         }
1185     }
1186     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1187     if (!sinks)
1188         return AVERROR(ENOMEM);
1189     for (i = 0; i < graph->nb_filters; i++) {
1190         f = graph->filters[i];
1191         if (!f->nb_outputs) {
1192             for (j = 0; j < f->nb_inputs; j++) {
1193                 sinks[n] = f->inputs[j];
1194                 f->inputs[j]->age_index = n++;
1195             }
1196         }
1197     }
1198     av_assert0(n == sink_links_count);
1199     graph->sink_links       = sinks;
1200     graph->sink_links_count = sink_links_count;
1201     return 0;
1202 }
1203
1204 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1205 {
1206     AVFilterContext *f;
1207     int i, j, ret;
1208     int fifo_count = 0;
1209
1210     for (i = 0; i < graph->nb_filters; i++) {
1211         f = graph->filters[i];
1212
1213         for (j = 0; j < f->nb_inputs; j++) {
1214             AVFilterLink *link = f->inputs[j];
1215             AVFilterContext *fifo_ctx;
1216             AVFilter *fifo;
1217             char name[32];
1218
1219             if (!link->dstpad->needs_fifo)
1220                 continue;
1221
1222             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1223                    avfilter_get_by_name("fifo") :
1224                    avfilter_get_by_name("afifo");
1225
1226             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1227
1228             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1229                                                NULL, graph);
1230             if (ret < 0)
1231                 return ret;
1232
1233             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1234             if (ret < 0)
1235                 return ret;
1236         }
1237     }
1238
1239     return 0;
1240 }
1241
1242 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1243 {
1244     int ret;
1245
1246     if ((ret = graph_check_validity(graphctx, log_ctx)))
1247         return ret;
1248     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1249         return ret;
1250     if ((ret = graph_config_formats(graphctx, log_ctx)))
1251         return ret;
1252     if ((ret = graph_config_links(graphctx, log_ctx)))
1253         return ret;
1254     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1255         return ret;
1256
1257     return 0;
1258 }
1259
1260 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1261 {
1262     int i, r = AVERROR(ENOSYS);
1263
1264     if (!graph)
1265         return r;
1266
1267     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1268         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1269         if (r != AVERROR(ENOSYS))
1270             return r;
1271     }
1272
1273     if (res_len && res)
1274         res[0] = 0;
1275
1276     for (i = 0; i < graph->nb_filters; i++) {
1277         AVFilterContext *filter = graph->filters[i];
1278         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1279             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1280             if (r != AVERROR(ENOSYS)) {
1281                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1282                     return r;
1283             }
1284         }
1285     }
1286
1287     return r;
1288 }
1289
1290 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1291 {
1292     int i;
1293
1294     if(!graph)
1295         return 0;
1296
1297     for (i = 0; i < graph->nb_filters; i++) {
1298         AVFilterContext *filter = graph->filters[i];
1299         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1300             AVFilterCommand **queue = &filter->command_queue, *next;
1301             while (*queue && (*queue)->time <= ts)
1302                 queue = &(*queue)->next;
1303             next = *queue;
1304             *queue = av_mallocz(sizeof(AVFilterCommand));
1305             (*queue)->command = av_strdup(command);
1306             (*queue)->arg     = av_strdup(arg);
1307             (*queue)->time    = ts;
1308             (*queue)->flags   = flags;
1309             (*queue)->next    = next;
1310             if(flags & AVFILTER_CMD_FLAG_ONE)
1311                 return 0;
1312         }
1313     }
1314
1315     return 0;
1316 }
1317
1318 static void heap_bubble_up(AVFilterGraph *graph,
1319                            AVFilterLink *link, int index)
1320 {
1321     AVFilterLink **links = graph->sink_links;
1322
1323     av_assert0(index >= 0);
1324
1325     while (index) {
1326         int parent = (index - 1) >> 1;
1327         if (links[parent]->current_pts_us >= link->current_pts_us)
1328             break;
1329         links[index] = links[parent];
1330         links[index]->age_index = index;
1331         index = parent;
1332     }
1333     links[index] = link;
1334     link->age_index = index;
1335 }
1336
1337 static void heap_bubble_down(AVFilterGraph *graph,
1338                              AVFilterLink *link, int index)
1339 {
1340     AVFilterLink **links = graph->sink_links;
1341
1342     av_assert0(index >= 0);
1343
1344     while (1) {
1345         int child = 2 * index + 1;
1346         if (child >= graph->sink_links_count)
1347             break;
1348         if (child + 1 < graph->sink_links_count &&
1349             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1350             child++;
1351         if (link->current_pts_us < links[child]->current_pts_us)
1352             break;
1353         links[index] = links[child];
1354         links[index]->age_index = index;
1355         index = child;
1356     }
1357     links[index] = link;
1358     link->age_index = index;
1359 }
1360
1361 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1362 {
1363     heap_bubble_up  (graph, link, link->age_index);
1364     heap_bubble_down(graph, link, link->age_index);
1365 }
1366
1367
1368 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1369 {
1370     AVFilterLink *oldest = graph->sink_links[0];
1371     int r;
1372
1373     while (graph->sink_links_count) {
1374         oldest = graph->sink_links[0];
1375         r = ff_request_frame(oldest);
1376         if (r != AVERROR_EOF)
1377             break;
1378         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1379                oldest->dst ? oldest->dst->name : "unknown",
1380                oldest->dstpad ? oldest->dstpad->name : "unknown");
1381         /* EOF: remove the link from the heap */
1382         if (oldest->age_index < --graph->sink_links_count)
1383             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1384                              oldest->age_index);
1385         oldest->age_index = -1;
1386     }
1387     if (!graph->sink_links_count)
1388         return AVERROR_EOF;
1389     av_assert1(oldest->age_index >= 0);
1390     while (oldest->frame_wanted_out) {
1391         r = ff_filter_graph_run_once(graph);
1392         if (r < 0)
1393             return r;
1394     }
1395     return 0;
1396 }
1397
1398 static AVFilterLink *graph_run_once_find_filter(AVFilterGraph *graph)
1399 {
1400     unsigned i, j;
1401     AVFilterContext *f;
1402
1403     /* TODO: replace scanning the graph with a priority list */
1404     for (i = 0; i < graph->nb_filters; i++) {
1405         f = graph->filters[i];
1406         for (j = 0; j < f->nb_outputs; j++)
1407             if (f->outputs[j]->frame_wanted_in)
1408                 return f->outputs[j];
1409     }
1410     for (i = 0; i < graph->nb_filters; i++) {
1411         f = graph->filters[i];
1412         for (j = 0; j < f->nb_outputs; j++)
1413             if (f->outputs[j]->frame_wanted_out)
1414                 return f->outputs[j];
1415     }
1416     return NULL;
1417 }
1418
1419 int ff_filter_graph_run_once(AVFilterGraph *graph)
1420 {
1421     AVFilterLink *link;
1422     int ret;
1423
1424     link = graph_run_once_find_filter(graph);
1425     if (!link) {
1426         av_log(NULL, AV_LOG_WARNING, "Useless run of a filter graph\n");
1427         return AVERROR(EAGAIN);
1428     }
1429     ret = ff_request_frame_to_filter(link);
1430     if (ret == AVERROR_EOF)
1431         /* local EOF will be forwarded through request_frame() /
1432            set_status() until it reaches the sink */
1433         ret = 0;
1434     return ret < 0 ? ret : 1;
1435 }