3af698d4beff733d1eb6d6fc6147f92c7480dda4
[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, j;
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             filter->graph = NULL;
103             for (j = 0; j<filter->nb_outputs; j++)
104                 if (filter->outputs[j])
105                     filter->outputs[j]->graph = NULL;
106
107             return;
108         }
109     }
110 }
111
112 void avfilter_graph_free(AVFilterGraph **graph)
113 {
114     if (!*graph)
115         return;
116
117     while ((*graph)->nb_filters)
118         avfilter_free((*graph)->filters[0]);
119
120     ff_graph_thread_free(*graph);
121
122     av_freep(&(*graph)->sink_links);
123
124     av_freep(&(*graph)->scale_sws_opts);
125     av_freep(&(*graph)->aresample_swr_opts);
126     av_freep(&(*graph)->resample_lavr_opts);
127     av_freep(&(*graph)->filters);
128     av_freep(&(*graph)->internal);
129     av_freep(graph);
130 }
131
132 #if FF_API_AVFILTER_OPEN
133 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
134 {
135     AVFilterContext **filters = av_realloc(graph->filters,
136                                            sizeof(*filters) * (graph->nb_filters + 1));
137     if (!filters)
138         return AVERROR(ENOMEM);
139
140     graph->filters = filters;
141     graph->filters[graph->nb_filters++] = filter;
142
143     filter->graph = graph;
144
145     return 0;
146 }
147 #endif
148
149 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
150                                  const char *name, const char *args, void *opaque,
151                                  AVFilterGraph *graph_ctx)
152 {
153     int ret;
154
155     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
156     if (!*filt_ctx)
157         return AVERROR(ENOMEM);
158
159     ret = avfilter_init_str(*filt_ctx, args);
160     if (ret < 0)
161         goto fail;
162
163     return 0;
164
165 fail:
166     if (*filt_ctx)
167         avfilter_free(*filt_ctx);
168     *filt_ctx = NULL;
169     return ret;
170 }
171
172 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
173 {
174     graph->disable_auto_convert = flags;
175 }
176
177 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
178                                              const AVFilter *filter,
179                                              const char *name)
180 {
181     AVFilterContext **filters, *s;
182
183     if (graph->thread_type && !graph->internal->thread_execute) {
184         if (graph->execute) {
185             graph->internal->thread_execute = graph->execute;
186         } else {
187             int ret = ff_graph_thread_init(graph);
188             if (ret < 0) {
189                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
190                 return NULL;
191             }
192         }
193     }
194
195     s = ff_filter_alloc(filter, name);
196     if (!s)
197         return NULL;
198
199     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
200     if (!filters) {
201         avfilter_free(s);
202         return NULL;
203     }
204
205     graph->filters = filters;
206     graph->filters[graph->nb_filters++] = s;
207
208     s->graph = graph;
209
210     return s;
211 }
212
213 /**
214  * Check for the validity of graph.
215  *
216  * A graph is considered valid if all its input and output pads are
217  * connected.
218  *
219  * @return >= 0 in case of success, a negative value otherwise
220  */
221 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
222 {
223     AVFilterContext *filt;
224     int i, j;
225
226     for (i = 0; i < graph->nb_filters; i++) {
227         const AVFilterPad *pad;
228         filt = graph->filters[i];
229
230         for (j = 0; j < filt->nb_inputs; j++) {
231             if (!filt->inputs[j] || !filt->inputs[j]->src) {
232                 pad = &filt->input_pads[j];
233                 av_log(log_ctx, AV_LOG_ERROR,
234                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
235                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
236                 return AVERROR(EINVAL);
237             }
238         }
239
240         for (j = 0; j < filt->nb_outputs; j++) {
241             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
242                 pad = &filt->output_pads[j];
243                 av_log(log_ctx, AV_LOG_ERROR,
244                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
245                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
246                 return AVERROR(EINVAL);
247             }
248         }
249     }
250
251     return 0;
252 }
253
254 /**
255  * Configure all the links of graphctx.
256  *
257  * @return >= 0 in case of success, a negative value otherwise
258  */
259 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
260 {
261     AVFilterContext *filt;
262     int i, ret;
263
264     for (i = 0; i < graph->nb_filters; i++) {
265         filt = graph->filters[i];
266
267         if (!filt->nb_outputs) {
268             if ((ret = avfilter_config_links(filt)))
269                 return ret;
270         }
271     }
272
273     return 0;
274 }
275
276 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
277 {
278     int i;
279
280     for (i = 0; i < graph->nb_filters; i++)
281         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
282             return graph->filters[i];
283
284     return NULL;
285 }
286
287 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
288 {
289     if (!l)
290         return;
291     if (l->nb_channel_layouts) {
292         if (l->all_layouts || l->all_counts)
293             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
294         l->all_layouts = l->all_counts = 0;
295     } else {
296         if (l->all_counts && !l->all_layouts)
297             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
298         l->all_layouts = 1;
299     }
300 }
301
302 static int filter_query_formats(AVFilterContext *ctx)
303 {
304     int ret, i;
305     AVFilterFormats *formats;
306     AVFilterChannelLayouts *chlayouts;
307     AVFilterFormats *samplerates;
308     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
309                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
310                             AVMEDIA_TYPE_VIDEO;
311
312     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
313         if (ret != AVERROR(EAGAIN))
314             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
315                    ctx->name, av_err2str(ret));
316         return ret;
317     }
318
319     for (i = 0; i < ctx->nb_inputs; i++)
320         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
321     for (i = 0; i < ctx->nb_outputs; i++)
322         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
323
324     formats = ff_all_formats(type);
325     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
326         return ret;
327     if (type == AVMEDIA_TYPE_AUDIO) {
328         samplerates = ff_all_samplerates();
329         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
330             return ret;
331         chlayouts = ff_all_channel_layouts();
332         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
333             return ret;
334     }
335     return 0;
336 }
337
338 static int formats_declared(AVFilterContext *f)
339 {
340     int i;
341
342     for (i = 0; i < f->nb_inputs; i++) {
343         if (!f->inputs[i]->out_formats)
344             return 0;
345         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
346             !(f->inputs[i]->out_samplerates &&
347               f->inputs[i]->out_channel_layouts))
348             return 0;
349     }
350     for (i = 0; i < f->nb_outputs; i++) {
351         if (!f->outputs[i]->in_formats)
352             return 0;
353         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
354             !(f->outputs[i]->in_samplerates &&
355               f->outputs[i]->in_channel_layouts))
356             return 0;
357     }
358     return 1;
359 }
360
361 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
362 {
363     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
364     if (a) {
365         a->refcount = 0;
366         a->refs     = NULL;
367         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
368         if (!a->formats && arg->formats)
369             av_freep(&a);
370     }
371     return a;
372 }
373
374 static int can_merge_formats(AVFilterFormats *a_arg,
375                              AVFilterFormats *b_arg,
376                              enum AVMediaType type,
377                              int is_sample_rate)
378 {
379     AVFilterFormats *a, *b, *ret;
380     if (a_arg == b_arg)
381         return 1;
382     a = clone_filter_formats(a_arg);
383     b = clone_filter_formats(b_arg);
384
385     if (!a || !b) {
386         if (a)
387             av_freep(&a->formats);
388         if (b)
389             av_freep(&b->formats);
390
391         av_freep(&a);
392         av_freep(&b);
393
394         return 0;
395     }
396
397     if (is_sample_rate) {
398         ret = ff_merge_samplerates(a, b);
399     } else {
400         ret = ff_merge_formats(a, b, type);
401     }
402     if (ret) {
403         av_freep(&ret->formats);
404         av_freep(&ret->refs);
405         av_freep(&ret);
406         return 1;
407     } else {
408         av_freep(&a->formats);
409         av_freep(&b->formats);
410         av_freep(&a);
411         av_freep(&b);
412         return 0;
413     }
414 }
415
416 /**
417  * Perform one round of query_formats() and merging formats lists on the
418  * filter graph.
419  * @return  >=0 if all links formats lists could be queried and merged;
420  *          AVERROR(EAGAIN) some progress was made in the queries or merging
421  *          and a later call may succeed;
422  *          AVERROR(EIO) (may be changed) plus a log message if no progress
423  *          was made and the negotiation is stuck;
424  *          a negative error code if some other error happened
425  */
426 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
427 {
428     int i, j, ret;
429     int scaler_count = 0, resampler_count = 0;
430     int count_queried = 0;        /* successful calls to query_formats() */
431     int count_merged = 0;         /* successful merge of formats lists */
432     int count_already_merged = 0; /* lists already merged */
433     int count_delayed = 0;        /* lists that need to be merged later */
434
435     for (i = 0; i < graph->nb_filters; i++) {
436         AVFilterContext *f = graph->filters[i];
437         if (formats_declared(f))
438             continue;
439         if (f->filter->query_formats)
440             ret = filter_query_formats(f);
441         else
442             ret = ff_default_query_formats(f);
443         if (ret < 0 && ret != AVERROR(EAGAIN))
444             return ret;
445         /* note: EAGAIN could indicate a partial success, not counted yet */
446         count_queried += ret >= 0;
447     }
448
449     /* go through and merge as many format lists as possible */
450     for (i = 0; i < graph->nb_filters; i++) {
451         AVFilterContext *filter = graph->filters[i];
452
453         for (j = 0; j < filter->nb_inputs; j++) {
454             AVFilterLink *link = filter->inputs[j];
455             int convert_needed = 0;
456
457             if (!link)
458                 continue;
459
460             if (link->in_formats != link->out_formats
461                 && link->in_formats && link->out_formats)
462                 if (!can_merge_formats(link->in_formats, link->out_formats,
463                                       link->type, 0))
464                     convert_needed = 1;
465             if (link->type == AVMEDIA_TYPE_AUDIO) {
466                 if (link->in_samplerates != link->out_samplerates
467                     && link->in_samplerates && link->out_samplerates)
468                     if (!can_merge_formats(link->in_samplerates,
469                                            link->out_samplerates,
470                                            0, 1))
471                         convert_needed = 1;
472             }
473
474 #define MERGE_DISPATCH(field, statement)                                     \
475             if (!(link->in_ ## field && link->out_ ## field)) {              \
476                 count_delayed++;                                             \
477             } else if (link->in_ ## field == link->out_ ## field) {          \
478                 count_already_merged++;                                      \
479             } else if (!convert_needed) {                                    \
480                 count_merged++;                                              \
481                 statement                                                    \
482             }
483
484             if (link->type == AVMEDIA_TYPE_AUDIO) {
485                 MERGE_DISPATCH(channel_layouts,
486                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
487                                                   link->out_channel_layouts))
488                         convert_needed = 1;
489                 )
490                 MERGE_DISPATCH(samplerates,
491                     if (!ff_merge_samplerates(link->in_samplerates,
492                                               link->out_samplerates))
493                         convert_needed = 1;
494                 )
495             }
496             MERGE_DISPATCH(formats,
497                 if (!ff_merge_formats(link->in_formats, link->out_formats,
498                                       link->type))
499                     convert_needed = 1;
500             )
501 #undef MERGE_DISPATCH
502
503             if (convert_needed) {
504                 AVFilterContext *convert;
505                 AVFilter *filter;
506                 AVFilterLink *inlink, *outlink;
507                 char scale_args[256];
508                 char inst_name[30];
509
510                 if (graph->disable_auto_convert) {
511                     av_log(log_ctx, AV_LOG_ERROR,
512                            "The filters '%s' and '%s' do not have a common format "
513                            "and automatic conversion is disabled.\n",
514                            link->src->name, link->dst->name);
515                     return AVERROR(EINVAL);
516                 }
517
518                 /* couldn't merge format lists. auto-insert conversion filter */
519                 switch (link->type) {
520                 case AVMEDIA_TYPE_VIDEO:
521                     if (!(filter = avfilter_get_by_name("scale"))) {
522                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
523                                "not present, cannot convert pixel formats.\n");
524                         return AVERROR(EINVAL);
525                     }
526
527                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
528                              scaler_count++);
529
530                     if ((ret = avfilter_graph_create_filter(&convert, filter,
531                                                             inst_name, graph->scale_sws_opts, NULL,
532                                                             graph)) < 0)
533                         return ret;
534                     break;
535                 case AVMEDIA_TYPE_AUDIO:
536                     if (!(filter = avfilter_get_by_name("aresample"))) {
537                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
538                                "not present, cannot convert audio formats.\n");
539                         return AVERROR(EINVAL);
540                     }
541
542                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
543                              resampler_count++);
544                     scale_args[0] = '\0';
545                     if (graph->aresample_swr_opts)
546                         snprintf(scale_args, sizeof(scale_args), "%s",
547                                  graph->aresample_swr_opts);
548                     if ((ret = avfilter_graph_create_filter(&convert, filter,
549                                                             inst_name, graph->aresample_swr_opts,
550                                                             NULL, graph)) < 0)
551                         return ret;
552                     break;
553                 default:
554                     return AVERROR(EINVAL);
555                 }
556
557                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
558                     return ret;
559
560                 if ((ret = filter_query_formats(convert)) < 0)
561                     return ret;
562
563                 inlink  = convert->inputs[0];
564                 outlink = convert->outputs[0];
565                 av_assert0( inlink-> in_formats->refcount > 0);
566                 av_assert0( inlink->out_formats->refcount > 0);
567                 av_assert0(outlink-> in_formats->refcount > 0);
568                 av_assert0(outlink->out_formats->refcount > 0);
569                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
570                     av_assert0( inlink-> in_samplerates->refcount > 0);
571                     av_assert0( inlink->out_samplerates->refcount > 0);
572                     av_assert0(outlink-> in_samplerates->refcount > 0);
573                     av_assert0(outlink->out_samplerates->refcount > 0);
574                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
575                     av_assert0( inlink->out_channel_layouts->refcount > 0);
576                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
577                     av_assert0(outlink->out_channel_layouts->refcount > 0);
578                 }
579                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
580                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
581                     ret = AVERROR(ENOSYS);
582                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
583                     (!ff_merge_samplerates(inlink->in_samplerates,
584                                            inlink->out_samplerates) ||
585                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
586                                                inlink->out_channel_layouts)))
587                     ret = AVERROR(ENOSYS);
588                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
589                     (!ff_merge_samplerates(outlink->in_samplerates,
590                                            outlink->out_samplerates) ||
591                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
592                                                outlink->out_channel_layouts)))
593                     ret = AVERROR(ENOSYS);
594
595                 if (ret < 0) {
596                     av_log(log_ctx, AV_LOG_ERROR,
597                            "Impossible to convert between the formats supported by the filter "
598                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
599                     return ret;
600                 }
601             }
602         }
603     }
604
605     av_log(graph, AV_LOG_DEBUG, "query_formats: "
606            "%d queried, %d merged, %d already done, %d delayed\n",
607            count_queried, count_merged, count_already_merged, count_delayed);
608     if (count_delayed) {
609         AVBPrint bp;
610
611         /* if count_queried > 0, one filter at least did set its formats,
612            that will give additional information to its neighbour;
613            if count_merged > 0, one pair of formats lists at least was merged,
614            that will give additional information to all connected filters;
615            in both cases, progress was made and a new round must be done */
616         if (count_queried || count_merged)
617             return AVERROR(EAGAIN);
618         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
619         for (i = 0; i < graph->nb_filters; i++)
620             if (!formats_declared(graph->filters[i]))
621                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
622                           graph->filters[i]->name);
623         av_log(graph, AV_LOG_ERROR,
624                "The following filters could not choose their formats: %s\n"
625                "Consider inserting the (a)format filter near their input or "
626                "output.\n", bp.str);
627         return AVERROR(EIO);
628     }
629     return 0;
630 }
631
632 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
633 {
634     int score = 0;
635
636     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
637         score ++;
638
639     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
640         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
641     }else
642         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
643
644     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
645         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
646         score += 20;
647
648     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
649         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
650         score += 2;
651
652     return score;
653 }
654
655 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
656                                                      enum AVSampleFormat src_fmt)
657 {
658     int score1, score2;
659
660     score1 = get_fmt_score(dst_fmt1, src_fmt);
661     score2 = get_fmt_score(dst_fmt2, src_fmt);
662
663     return score1 < score2 ? dst_fmt1 : dst_fmt2;
664 }
665
666 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
667 {
668     if (!link || !link->in_formats)
669         return 0;
670
671     if (link->type == AVMEDIA_TYPE_VIDEO) {
672         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
673             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
674             enum AVPixelFormat best= AV_PIX_FMT_NONE;
675             int i;
676             for (i=0; i<link->in_formats->nb_formats; i++) {
677                 enum AVPixelFormat p = link->in_formats->formats[i];
678                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
679             }
680             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
681                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
682                    av_get_pix_fmt_name(ref->format), has_alpha);
683             link->in_formats->formats[0] = best;
684         }
685     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
686         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
687             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
688             int i;
689             for (i=0; i<link->in_formats->nb_formats; i++) {
690                 enum AVSampleFormat p = link->in_formats->formats[i];
691                 best = find_best_sample_fmt_of_2(best, p, ref->format);
692             }
693             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
694                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
695                    av_get_sample_fmt_name(ref->format));
696             link->in_formats->formats[0] = best;
697         }
698     }
699
700     link->in_formats->nb_formats = 1;
701     link->format = link->in_formats->formats[0];
702
703     if (link->type == AVMEDIA_TYPE_AUDIO) {
704         if (!link->in_samplerates->nb_formats) {
705             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
706                    " the link between filters %s and %s.\n", link->src->name,
707                    link->dst->name);
708             return AVERROR(EINVAL);
709         }
710         link->in_samplerates->nb_formats = 1;
711         link->sample_rate = link->in_samplerates->formats[0];
712
713         if (link->in_channel_layouts->all_layouts) {
714             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
715                    " the link between filters %s and %s.\n", link->src->name,
716                    link->dst->name);
717             if (!link->in_channel_layouts->all_counts)
718                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
719                        "supported, try specifying a channel layout using "
720                        "'aformat=channel_layouts=something'.\n");
721             return AVERROR(EINVAL);
722         }
723         link->in_channel_layouts->nb_channel_layouts = 1;
724         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
725         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
726             link->channel_layout = 0;
727         else
728             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
729     }
730
731     ff_formats_unref(&link->in_formats);
732     ff_formats_unref(&link->out_formats);
733     ff_formats_unref(&link->in_samplerates);
734     ff_formats_unref(&link->out_samplerates);
735     ff_channel_layouts_unref(&link->in_channel_layouts);
736     ff_channel_layouts_unref(&link->out_channel_layouts);
737
738     return 0;
739 }
740
741 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
742 do {                                                                   \
743     for (i = 0; i < filter->nb_inputs; i++) {                          \
744         AVFilterLink *link = filter->inputs[i];                        \
745         fmt_type fmt;                                                  \
746                                                                        \
747         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
748             continue;                                                  \
749         fmt = link->out_ ## list->var[0];                              \
750                                                                        \
751         for (j = 0; j < filter->nb_outputs; j++) {                     \
752             AVFilterLink *out_link = filter->outputs[j];               \
753             list_type *fmts;                                           \
754                                                                        \
755             if (link->type != out_link->type ||                        \
756                 out_link->in_ ## list->nb == 1)                        \
757                 continue;                                              \
758             fmts = out_link->in_ ## list;                              \
759                                                                        \
760             if (!out_link->in_ ## list->nb) {                          \
761                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
762                     return ret;                                        \
763                 ret = 1;                                               \
764                 break;                                                 \
765             }                                                          \
766                                                                        \
767             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
768                 if (fmts->var[k] == fmt) {                             \
769                     fmts->var[0]  = fmt;                               \
770                     fmts->nb = 1;                                      \
771                     ret = 1;                                           \
772                     break;                                             \
773                 }                                                      \
774         }                                                              \
775     }                                                                  \
776 } while (0)
777
778 static int reduce_formats_on_filter(AVFilterContext *filter)
779 {
780     int i, j, k, ret = 0;
781
782     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
783                    nb_formats, ff_add_format, ff_formats_unref);
784     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
785                    nb_formats, ff_add_format, ff_formats_unref);
786
787     /* reduce channel layouts */
788     for (i = 0; i < filter->nb_inputs; i++) {
789         AVFilterLink *inlink = filter->inputs[i];
790         uint64_t fmt;
791
792         if (!inlink->out_channel_layouts ||
793             inlink->out_channel_layouts->nb_channel_layouts != 1)
794             continue;
795         fmt = inlink->out_channel_layouts->channel_layouts[0];
796
797         for (j = 0; j < filter->nb_outputs; j++) {
798             AVFilterLink *outlink = filter->outputs[j];
799             AVFilterChannelLayouts *fmts;
800
801             fmts = outlink->in_channel_layouts;
802             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
803                 continue;
804
805             if (fmts->all_layouts &&
806                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
807                 /* Turn the infinite list into a singleton */
808                 fmts->all_layouts = fmts->all_counts  = 0;
809                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
810                     ret = 1;
811                 break;
812             }
813
814             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
815                 if (fmts->channel_layouts[k] == fmt) {
816                     fmts->channel_layouts[0]  = fmt;
817                     fmts->nb_channel_layouts = 1;
818                     ret = 1;
819                     break;
820                 }
821             }
822         }
823     }
824
825     return ret;
826 }
827
828 static int reduce_formats(AVFilterGraph *graph)
829 {
830     int i, reduced, ret;
831
832     do {
833         reduced = 0;
834
835         for (i = 0; i < graph->nb_filters; i++) {
836             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
837                 return ret;
838             reduced |= ret;
839         }
840     } while (reduced);
841
842     return 0;
843 }
844
845 static void swap_samplerates_on_filter(AVFilterContext *filter)
846 {
847     AVFilterLink *link = NULL;
848     int sample_rate;
849     int i, j;
850
851     for (i = 0; i < filter->nb_inputs; i++) {
852         link = filter->inputs[i];
853
854         if (link->type == AVMEDIA_TYPE_AUDIO &&
855             link->out_samplerates->nb_formats== 1)
856             break;
857     }
858     if (i == filter->nb_inputs)
859         return;
860
861     sample_rate = link->out_samplerates->formats[0];
862
863     for (i = 0; i < filter->nb_outputs; i++) {
864         AVFilterLink *outlink = filter->outputs[i];
865         int best_idx, best_diff = INT_MAX;
866
867         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
868             outlink->in_samplerates->nb_formats < 2)
869             continue;
870
871         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
872             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
873
874             if (diff < best_diff) {
875                 best_diff = diff;
876                 best_idx  = j;
877             }
878         }
879         FFSWAP(int, outlink->in_samplerates->formats[0],
880                outlink->in_samplerates->formats[best_idx]);
881     }
882 }
883
884 static void swap_samplerates(AVFilterGraph *graph)
885 {
886     int i;
887
888     for (i = 0; i < graph->nb_filters; i++)
889         swap_samplerates_on_filter(graph->filters[i]);
890 }
891
892 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
893 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
894 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
895 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
896 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
897 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
898 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
899
900 /* allowable substitutions for channel pairs when comparing layouts,
901  * ordered by priority for both values */
902 static const uint64_t ch_subst[][2] = {
903     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
904     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
905     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
906     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
907     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
908     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
909     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
910     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
911     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
912     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
913     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
914     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
915     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
916     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
917     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
918     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
919     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
920     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
921     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
922     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
923     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
924 };
925
926 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
927 {
928     AVFilterLink *link = NULL;
929     int i, j, k;
930
931     for (i = 0; i < filter->nb_inputs; i++) {
932         link = filter->inputs[i];
933
934         if (link->type == AVMEDIA_TYPE_AUDIO &&
935             link->out_channel_layouts->nb_channel_layouts == 1)
936             break;
937     }
938     if (i == filter->nb_inputs)
939         return;
940
941     for (i = 0; i < filter->nb_outputs; i++) {
942         AVFilterLink *outlink = filter->outputs[i];
943         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
944
945         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
946             outlink->in_channel_layouts->nb_channel_layouts < 2)
947             continue;
948
949         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
950             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
951             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
952             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
953             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
954             int count_diff        = out_channels - in_channels;
955             int matched_channels, extra_channels;
956             int score = 100000;
957
958             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
959                 /* Compute score in case the input or output layout encodes
960                    a channel count; in this case the score is not altered by
961                    the computation afterwards, as in_chlayout and
962                    out_chlayout have both been set to 0 */
963                 if (FF_LAYOUT2COUNT(in_chlayout))
964                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
965                 if (FF_LAYOUT2COUNT(out_chlayout))
966                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
967                 score -= 10000 + FFABS(out_channels - in_channels) +
968                          (in_channels > out_channels ? 10000 : 0);
969                 in_chlayout = out_chlayout = 0;
970                 /* Let the remaining computation run, even if the score
971                    value is not altered */
972             }
973
974             /* channel substitution */
975             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
976                 uint64_t cmp0 = ch_subst[k][0];
977                 uint64_t cmp1 = ch_subst[k][1];
978                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
979                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
980                     in_chlayout  &= ~cmp0;
981                     out_chlayout &= ~cmp1;
982                     /* add score for channel match, minus a deduction for
983                        having to do the substitution */
984                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
985                 }
986             }
987
988             /* no penalty for LFE channel mismatch */
989             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
990                 (out_chlayout & AV_CH_LOW_FREQUENCY))
991                 score += 10;
992             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
993             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
994
995             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
996                                                                  out_chlayout);
997             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
998                                                                  (~in_chlayout));
999             score += 10 * matched_channels - 5 * extra_channels;
1000
1001             if (score > best_score ||
1002                 (count_diff < best_count_diff && score == best_score)) {
1003                 best_score = score;
1004                 best_idx   = j;
1005                 best_count_diff = count_diff;
1006             }
1007         }
1008         av_assert0(best_idx >= 0);
1009         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1010                outlink->in_channel_layouts->channel_layouts[best_idx]);
1011     }
1012
1013 }
1014
1015 static void swap_channel_layouts(AVFilterGraph *graph)
1016 {
1017     int i;
1018
1019     for (i = 0; i < graph->nb_filters; i++)
1020         swap_channel_layouts_on_filter(graph->filters[i]);
1021 }
1022
1023 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1024 {
1025     AVFilterLink *link = NULL;
1026     int format, bps;
1027     int i, j;
1028
1029     for (i = 0; i < filter->nb_inputs; i++) {
1030         link = filter->inputs[i];
1031
1032         if (link->type == AVMEDIA_TYPE_AUDIO &&
1033             link->out_formats->nb_formats == 1)
1034             break;
1035     }
1036     if (i == filter->nb_inputs)
1037         return;
1038
1039     format = link->out_formats->formats[0];
1040     bps    = av_get_bytes_per_sample(format);
1041
1042     for (i = 0; i < filter->nb_outputs; i++) {
1043         AVFilterLink *outlink = filter->outputs[i];
1044         int best_idx = -1, best_score = INT_MIN;
1045
1046         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1047             outlink->in_formats->nb_formats < 2)
1048             continue;
1049
1050         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1051             int out_format = outlink->in_formats->formats[j];
1052             int out_bps    = av_get_bytes_per_sample(out_format);
1053             int score;
1054
1055             if (av_get_packed_sample_fmt(out_format) == format ||
1056                 av_get_planar_sample_fmt(out_format) == format) {
1057                 best_idx   = j;
1058                 break;
1059             }
1060
1061             /* for s32 and float prefer double to prevent loss of information */
1062             if (bps == 4 && out_bps == 8) {
1063                 best_idx = j;
1064                 break;
1065             }
1066
1067             /* prefer closest higher or equal bps */
1068             score = -abs(out_bps - bps);
1069             if (out_bps >= bps)
1070                 score += INT_MAX/2;
1071
1072             if (score > best_score) {
1073                 best_score = score;
1074                 best_idx   = j;
1075             }
1076         }
1077         av_assert0(best_idx >= 0);
1078         FFSWAP(int, outlink->in_formats->formats[0],
1079                outlink->in_formats->formats[best_idx]);
1080     }
1081 }
1082
1083 static void swap_sample_fmts(AVFilterGraph *graph)
1084 {
1085     int i;
1086
1087     for (i = 0; i < graph->nb_filters; i++)
1088         swap_sample_fmts_on_filter(graph->filters[i]);
1089
1090 }
1091
1092 static int pick_formats(AVFilterGraph *graph)
1093 {
1094     int i, j, ret;
1095     int change;
1096
1097     do{
1098         change = 0;
1099         for (i = 0; i < graph->nb_filters; i++) {
1100             AVFilterContext *filter = graph->filters[i];
1101             if (filter->nb_inputs){
1102                 for (j = 0; j < filter->nb_inputs; j++){
1103                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1104                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1105                             return ret;
1106                         change = 1;
1107                     }
1108                 }
1109             }
1110             if (filter->nb_outputs){
1111                 for (j = 0; j < filter->nb_outputs; j++){
1112                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1113                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1114                             return ret;
1115                         change = 1;
1116                     }
1117                 }
1118             }
1119             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1120                 for (j = 0; j < filter->nb_outputs; j++) {
1121                     if(filter->outputs[j]->format<0) {
1122                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1123                             return ret;
1124                         change = 1;
1125                     }
1126                 }
1127             }
1128         }
1129     }while(change);
1130
1131     for (i = 0; i < graph->nb_filters; i++) {
1132         AVFilterContext *filter = graph->filters[i];
1133
1134         for (j = 0; j < filter->nb_inputs; j++)
1135             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1136                 return ret;
1137         for (j = 0; j < filter->nb_outputs; j++)
1138             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1139                 return ret;
1140     }
1141     return 0;
1142 }
1143
1144 /**
1145  * Configure the formats of all the links in the graph.
1146  */
1147 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1148 {
1149     int ret;
1150
1151     /* find supported formats from sub-filters, and merge along links */
1152     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1153         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1154     if (ret < 0)
1155         return ret;
1156
1157     /* Once everything is merged, it's possible that we'll still have
1158      * multiple valid media format choices. We try to minimize the amount
1159      * of format conversion inside filters */
1160     if ((ret = reduce_formats(graph)) < 0)
1161         return ret;
1162
1163     /* for audio filters, ensure the best format, sample rate and channel layout
1164      * is selected */
1165     swap_sample_fmts(graph);
1166     swap_samplerates(graph);
1167     swap_channel_layouts(graph);
1168
1169     if ((ret = pick_formats(graph)) < 0)
1170         return ret;
1171
1172     return 0;
1173 }
1174
1175 static int graph_config_pointers(AVFilterGraph *graph,
1176                                              AVClass *log_ctx)
1177 {
1178     unsigned i, j;
1179     int sink_links_count = 0, n = 0;
1180     AVFilterContext *f;
1181     AVFilterLink **sinks;
1182
1183     for (i = 0; i < graph->nb_filters; i++) {
1184         f = graph->filters[i];
1185         for (j = 0; j < f->nb_inputs; j++) {
1186             f->inputs[j]->graph     = graph;
1187             f->inputs[j]->age_index = -1;
1188         }
1189         for (j = 0; j < f->nb_outputs; j++) {
1190             f->outputs[j]->graph    = graph;
1191             f->outputs[j]->age_index= -1;
1192         }
1193         if (!f->nb_outputs) {
1194             if (f->nb_inputs > INT_MAX - sink_links_count)
1195                 return AVERROR(EINVAL);
1196             sink_links_count += f->nb_inputs;
1197         }
1198     }
1199     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1200     if (!sinks)
1201         return AVERROR(ENOMEM);
1202     for (i = 0; i < graph->nb_filters; i++) {
1203         f = graph->filters[i];
1204         if (!f->nb_outputs) {
1205             for (j = 0; j < f->nb_inputs; j++) {
1206                 sinks[n] = f->inputs[j];
1207                 f->inputs[j]->age_index = n++;
1208             }
1209         }
1210     }
1211     av_assert0(n == sink_links_count);
1212     graph->sink_links       = sinks;
1213     graph->sink_links_count = sink_links_count;
1214     return 0;
1215 }
1216
1217 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1218 {
1219     AVFilterContext *f;
1220     int i, j, ret;
1221     int fifo_count = 0;
1222
1223     for (i = 0; i < graph->nb_filters; i++) {
1224         f = graph->filters[i];
1225
1226         for (j = 0; j < f->nb_inputs; j++) {
1227             AVFilterLink *link = f->inputs[j];
1228             AVFilterContext *fifo_ctx;
1229             AVFilter *fifo;
1230             char name[32];
1231
1232             if (!link->dstpad->needs_fifo)
1233                 continue;
1234
1235             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1236                    avfilter_get_by_name("fifo") :
1237                    avfilter_get_by_name("afifo");
1238
1239             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1240
1241             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1242                                                NULL, graph);
1243             if (ret < 0)
1244                 return ret;
1245
1246             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1247             if (ret < 0)
1248                 return ret;
1249         }
1250     }
1251
1252     return 0;
1253 }
1254
1255 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1256 {
1257     int ret;
1258
1259     if ((ret = graph_check_validity(graphctx, log_ctx)))
1260         return ret;
1261     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1262         return ret;
1263     if ((ret = graph_config_formats(graphctx, log_ctx)))
1264         return ret;
1265     if ((ret = graph_config_links(graphctx, log_ctx)))
1266         return ret;
1267     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1268         return ret;
1269
1270     return 0;
1271 }
1272
1273 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1274 {
1275     int i, r = AVERROR(ENOSYS);
1276
1277     if (!graph)
1278         return r;
1279
1280     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1281         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1282         if (r != AVERROR(ENOSYS))
1283             return r;
1284     }
1285
1286     if (res_len && res)
1287         res[0] = 0;
1288
1289     for (i = 0; i < graph->nb_filters; i++) {
1290         AVFilterContext *filter = graph->filters[i];
1291         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1292             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1293             if (r != AVERROR(ENOSYS)) {
1294                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1295                     return r;
1296             }
1297         }
1298     }
1299
1300     return r;
1301 }
1302
1303 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1304 {
1305     int i;
1306
1307     if(!graph)
1308         return 0;
1309
1310     for (i = 0; i < graph->nb_filters; i++) {
1311         AVFilterContext *filter = graph->filters[i];
1312         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1313             AVFilterCommand **queue = &filter->command_queue, *next;
1314             while (*queue && (*queue)->time <= ts)
1315                 queue = &(*queue)->next;
1316             next = *queue;
1317             *queue = av_mallocz(sizeof(AVFilterCommand));
1318             (*queue)->command = av_strdup(command);
1319             (*queue)->arg     = av_strdup(arg);
1320             (*queue)->time    = ts;
1321             (*queue)->flags   = flags;
1322             (*queue)->next    = next;
1323             if(flags & AVFILTER_CMD_FLAG_ONE)
1324                 return 0;
1325         }
1326     }
1327
1328     return 0;
1329 }
1330
1331 static void heap_bubble_up(AVFilterGraph *graph,
1332                            AVFilterLink *link, int index)
1333 {
1334     AVFilterLink **links = graph->sink_links;
1335
1336     av_assert0(index >= 0);
1337
1338     while (index) {
1339         int parent = (index - 1) >> 1;
1340         if (links[parent]->current_pts_us >= link->current_pts_us)
1341             break;
1342         links[index] = links[parent];
1343         links[index]->age_index = index;
1344         index = parent;
1345     }
1346     links[index] = link;
1347     link->age_index = index;
1348 }
1349
1350 static void heap_bubble_down(AVFilterGraph *graph,
1351                              AVFilterLink *link, int index)
1352 {
1353     AVFilterLink **links = graph->sink_links;
1354
1355     av_assert0(index >= 0);
1356
1357     while (1) {
1358         int child = 2 * index + 1;
1359         if (child >= graph->sink_links_count)
1360             break;
1361         if (child + 1 < graph->sink_links_count &&
1362             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1363             child++;
1364         if (link->current_pts_us < links[child]->current_pts_us)
1365             break;
1366         links[index] = links[child];
1367         links[index]->age_index = index;
1368         index = child;
1369     }
1370     links[index] = link;
1371     link->age_index = index;
1372 }
1373
1374 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1375 {
1376     heap_bubble_up  (graph, link, link->age_index);
1377     heap_bubble_down(graph, link, link->age_index);
1378 }
1379
1380
1381 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1382 {
1383     AVFilterLink *oldest = graph->sink_links[0];
1384     int r;
1385
1386     while (graph->sink_links_count) {
1387         oldest = graph->sink_links[0];
1388         r = ff_request_frame(oldest);
1389         if (r != AVERROR_EOF)
1390             break;
1391         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1392                oldest->dst ? oldest->dst->name : "unknown",
1393                oldest->dstpad ? oldest->dstpad->name : "unknown");
1394         /* EOF: remove the link from the heap */
1395         if (oldest->age_index < --graph->sink_links_count)
1396             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1397                              oldest->age_index);
1398         oldest->age_index = -1;
1399     }
1400     if (!graph->sink_links_count)
1401         return AVERROR_EOF;
1402     av_assert1(oldest->age_index >= 0);
1403     while (oldest->frame_wanted_out) {
1404         r = ff_filter_graph_run_once(graph);
1405         if (r < 0)
1406             return r;
1407     }
1408     return 0;
1409 }
1410
1411 static AVFilterLink *graph_run_once_find_filter(AVFilterGraph *graph)
1412 {
1413     unsigned i, j;
1414     AVFilterContext *f;
1415
1416     /* TODO: replace scanning the graph with a priority list */
1417     for (i = 0; i < graph->nb_filters; i++) {
1418         f = graph->filters[i];
1419         for (j = 0; j < f->nb_outputs; j++)
1420             if (f->outputs[j]->frame_wanted_in)
1421                 return f->outputs[j];
1422     }
1423     for (i = 0; i < graph->nb_filters; i++) {
1424         f = graph->filters[i];
1425         for (j = 0; j < f->nb_outputs; j++)
1426             if (f->outputs[j]->frame_wanted_out)
1427                 return f->outputs[j];
1428     }
1429     return NULL;
1430 }
1431
1432 int ff_filter_graph_run_once(AVFilterGraph *graph)
1433 {
1434     AVFilterLink *link;
1435     int ret;
1436
1437     link = graph_run_once_find_filter(graph);
1438     if (!link) {
1439         av_log(NULL, AV_LOG_WARNING, "Useless run of a filter graph\n");
1440         return AVERROR(EAGAIN);
1441     }
1442     ret = ff_request_frame_to_filter(link);
1443     if (ret == AVERROR_EOF)
1444         /* local EOF will be forwarded through request_frame() /
1445            set_status() until it reaches the sink */
1446         ret = 0;
1447     return ret < 0 ? ret : 1;
1448 }