avfilter/avfiltergraph: Clear graph pointers in ff_filter_graph_remove_filter()
[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                 /* couldn't merge format lists. auto-insert conversion filter */
511                 switch (link->type) {
512                 case AVMEDIA_TYPE_VIDEO:
513                     if (!(filter = avfilter_get_by_name("scale"))) {
514                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
515                                "not present, cannot convert pixel formats.\n");
516                         return AVERROR(EINVAL);
517                     }
518
519                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
520                              scaler_count++);
521
522                     if ((ret = avfilter_graph_create_filter(&convert, filter,
523                                                             inst_name, graph->scale_sws_opts, NULL,
524                                                             graph)) < 0)
525                         return ret;
526                     break;
527                 case AVMEDIA_TYPE_AUDIO:
528                     if (!(filter = avfilter_get_by_name("aresample"))) {
529                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
530                                "not present, cannot convert audio formats.\n");
531                         return AVERROR(EINVAL);
532                     }
533
534                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
535                              resampler_count++);
536                     scale_args[0] = '\0';
537                     if (graph->aresample_swr_opts)
538                         snprintf(scale_args, sizeof(scale_args), "%s",
539                                  graph->aresample_swr_opts);
540                     if ((ret = avfilter_graph_create_filter(&convert, filter,
541                                                             inst_name, graph->aresample_swr_opts,
542                                                             NULL, graph)) < 0)
543                         return ret;
544                     break;
545                 default:
546                     return AVERROR(EINVAL);
547                 }
548
549                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
550                     return ret;
551
552                 if ((ret = filter_query_formats(convert)) < 0)
553                     return ret;
554
555                 inlink  = convert->inputs[0];
556                 outlink = convert->outputs[0];
557                 av_assert0( inlink-> in_formats->refcount > 0);
558                 av_assert0( inlink->out_formats->refcount > 0);
559                 av_assert0(outlink-> in_formats->refcount > 0);
560                 av_assert0(outlink->out_formats->refcount > 0);
561                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
562                     av_assert0( inlink-> in_samplerates->refcount > 0);
563                     av_assert0( inlink->out_samplerates->refcount > 0);
564                     av_assert0(outlink-> in_samplerates->refcount > 0);
565                     av_assert0(outlink->out_samplerates->refcount > 0);
566                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
567                     av_assert0( inlink->out_channel_layouts->refcount > 0);
568                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
569                     av_assert0(outlink->out_channel_layouts->refcount > 0);
570                 }
571                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
572                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
573                     ret = AVERROR(ENOSYS);
574                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
575                     (!ff_merge_samplerates(inlink->in_samplerates,
576                                            inlink->out_samplerates) ||
577                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
578                                                inlink->out_channel_layouts)))
579                     ret = AVERROR(ENOSYS);
580                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
581                     (!ff_merge_samplerates(outlink->in_samplerates,
582                                            outlink->out_samplerates) ||
583                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
584                                                outlink->out_channel_layouts)))
585                     ret = AVERROR(ENOSYS);
586
587                 if (ret < 0) {
588                     av_log(log_ctx, AV_LOG_ERROR,
589                            "Impossible to convert between the formats supported by the filter "
590                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
591                     return ret;
592                 }
593             }
594         }
595     }
596
597     av_log(graph, AV_LOG_DEBUG, "query_formats: "
598            "%d queried, %d merged, %d already done, %d delayed\n",
599            count_queried, count_merged, count_already_merged, count_delayed);
600     if (count_delayed) {
601         AVBPrint bp;
602
603         /* if count_queried > 0, one filter at least did set its formats,
604            that will give additional information to its neighbour;
605            if count_merged > 0, one pair of formats lists at least was merged,
606            that will give additional information to all connected filters;
607            in both cases, progress was made and a new round must be done */
608         if (count_queried || count_merged)
609             return AVERROR(EAGAIN);
610         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
611         for (i = 0; i < graph->nb_filters; i++)
612             if (!formats_declared(graph->filters[i]))
613                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
614                           graph->filters[i]->name);
615         av_log(graph, AV_LOG_ERROR,
616                "The following filters could not choose their formats: %s\n"
617                "Consider inserting the (a)format filter near their input or "
618                "output.\n", bp.str);
619         return AVERROR(EIO);
620     }
621     return 0;
622 }
623
624 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
625 {
626     int score = 0;
627
628     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
629         score ++;
630
631     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
632         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
633     }else
634         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
635
636     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
637         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
638         score += 20;
639
640     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
641         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
642         score += 2;
643
644     return score;
645 }
646
647 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
648                                                      enum AVSampleFormat src_fmt)
649 {
650     int score1, score2;
651
652     score1 = get_fmt_score(dst_fmt1, src_fmt);
653     score2 = get_fmt_score(dst_fmt2, src_fmt);
654
655     return score1 < score2 ? dst_fmt1 : dst_fmt2;
656 }
657
658 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
659 {
660     if (!link || !link->in_formats)
661         return 0;
662
663     if (link->type == AVMEDIA_TYPE_VIDEO) {
664         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
665             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
666             enum AVPixelFormat best= AV_PIX_FMT_NONE;
667             int i;
668             for (i=0; i<link->in_formats->nb_formats; i++) {
669                 enum AVPixelFormat p = link->in_formats->formats[i];
670                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
671             }
672             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
673                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
674                    av_get_pix_fmt_name(ref->format), has_alpha);
675             link->in_formats->formats[0] = best;
676         }
677     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
678         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
679             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
680             int i;
681             for (i=0; i<link->in_formats->nb_formats; i++) {
682                 enum AVSampleFormat p = link->in_formats->formats[i];
683                 best = find_best_sample_fmt_of_2(best, p, ref->format);
684             }
685             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
686                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
687                    av_get_sample_fmt_name(ref->format));
688             link->in_formats->formats[0] = best;
689         }
690     }
691
692     link->in_formats->nb_formats = 1;
693     link->format = link->in_formats->formats[0];
694
695     if (link->type == AVMEDIA_TYPE_AUDIO) {
696         if (!link->in_samplerates->nb_formats) {
697             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
698                    " the link between filters %s and %s.\n", link->src->name,
699                    link->dst->name);
700             return AVERROR(EINVAL);
701         }
702         link->in_samplerates->nb_formats = 1;
703         link->sample_rate = link->in_samplerates->formats[0];
704
705         if (link->in_channel_layouts->all_layouts) {
706             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
707                    " the link between filters %s and %s.\n", link->src->name,
708                    link->dst->name);
709             if (!link->in_channel_layouts->all_counts)
710                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
711                        "supported, try specifying a channel layout using "
712                        "'aformat=channel_layouts=something'.\n");
713             return AVERROR(EINVAL);
714         }
715         link->in_channel_layouts->nb_channel_layouts = 1;
716         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
717         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
718             link->channel_layout = 0;
719         else
720             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
721     }
722
723     ff_formats_unref(&link->in_formats);
724     ff_formats_unref(&link->out_formats);
725     ff_formats_unref(&link->in_samplerates);
726     ff_formats_unref(&link->out_samplerates);
727     ff_channel_layouts_unref(&link->in_channel_layouts);
728     ff_channel_layouts_unref(&link->out_channel_layouts);
729
730     return 0;
731 }
732
733 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
734 do {                                                                   \
735     for (i = 0; i < filter->nb_inputs; i++) {                          \
736         AVFilterLink *link = filter->inputs[i];                        \
737         fmt_type fmt;                                                  \
738                                                                        \
739         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
740             continue;                                                  \
741         fmt = link->out_ ## list->var[0];                              \
742                                                                        \
743         for (j = 0; j < filter->nb_outputs; j++) {                     \
744             AVFilterLink *out_link = filter->outputs[j];               \
745             list_type *fmts;                                           \
746                                                                        \
747             if (link->type != out_link->type ||                        \
748                 out_link->in_ ## list->nb == 1)                        \
749                 continue;                                              \
750             fmts = out_link->in_ ## list;                              \
751                                                                        \
752             if (!out_link->in_ ## list->nb) {                          \
753                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
754                     return ret;                                        \
755                 ret = 1;                                               \
756                 break;                                                 \
757             }                                                          \
758                                                                        \
759             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
760                 if (fmts->var[k] == fmt) {                             \
761                     fmts->var[0]  = fmt;                               \
762                     fmts->nb = 1;                                      \
763                     ret = 1;                                           \
764                     break;                                             \
765                 }                                                      \
766         }                                                              \
767     }                                                                  \
768 } while (0)
769
770 static int reduce_formats_on_filter(AVFilterContext *filter)
771 {
772     int i, j, k, ret = 0;
773
774     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
775                    nb_formats, ff_add_format, ff_formats_unref);
776     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
777                    nb_formats, ff_add_format, ff_formats_unref);
778
779     /* reduce channel layouts */
780     for (i = 0; i < filter->nb_inputs; i++) {
781         AVFilterLink *inlink = filter->inputs[i];
782         uint64_t fmt;
783
784         if (!inlink->out_channel_layouts ||
785             inlink->out_channel_layouts->nb_channel_layouts != 1)
786             continue;
787         fmt = inlink->out_channel_layouts->channel_layouts[0];
788
789         for (j = 0; j < filter->nb_outputs; j++) {
790             AVFilterLink *outlink = filter->outputs[j];
791             AVFilterChannelLayouts *fmts;
792
793             fmts = outlink->in_channel_layouts;
794             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
795                 continue;
796
797             if (fmts->all_layouts &&
798                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
799                 /* Turn the infinite list into a singleton */
800                 fmts->all_layouts = fmts->all_counts  = 0;
801                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
802                     ret = 1;
803                 break;
804             }
805
806             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
807                 if (fmts->channel_layouts[k] == fmt) {
808                     fmts->channel_layouts[0]  = fmt;
809                     fmts->nb_channel_layouts = 1;
810                     ret = 1;
811                     break;
812                 }
813             }
814         }
815     }
816
817     return ret;
818 }
819
820 static int reduce_formats(AVFilterGraph *graph)
821 {
822     int i, reduced, ret;
823
824     do {
825         reduced = 0;
826
827         for (i = 0; i < graph->nb_filters; i++) {
828             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
829                 return ret;
830             reduced |= ret;
831         }
832     } while (reduced);
833
834     return 0;
835 }
836
837 static void swap_samplerates_on_filter(AVFilterContext *filter)
838 {
839     AVFilterLink *link = NULL;
840     int sample_rate;
841     int i, j;
842
843     for (i = 0; i < filter->nb_inputs; i++) {
844         link = filter->inputs[i];
845
846         if (link->type == AVMEDIA_TYPE_AUDIO &&
847             link->out_samplerates->nb_formats== 1)
848             break;
849     }
850     if (i == filter->nb_inputs)
851         return;
852
853     sample_rate = link->out_samplerates->formats[0];
854
855     for (i = 0; i < filter->nb_outputs; i++) {
856         AVFilterLink *outlink = filter->outputs[i];
857         int best_idx, best_diff = INT_MAX;
858
859         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
860             outlink->in_samplerates->nb_formats < 2)
861             continue;
862
863         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
864             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
865
866             if (diff < best_diff) {
867                 best_diff = diff;
868                 best_idx  = j;
869             }
870         }
871         FFSWAP(int, outlink->in_samplerates->formats[0],
872                outlink->in_samplerates->formats[best_idx]);
873     }
874 }
875
876 static void swap_samplerates(AVFilterGraph *graph)
877 {
878     int i;
879
880     for (i = 0; i < graph->nb_filters; i++)
881         swap_samplerates_on_filter(graph->filters[i]);
882 }
883
884 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
885 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
886 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
887 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
888 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
889 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
890 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
891
892 /* allowable substitutions for channel pairs when comparing layouts,
893  * ordered by priority for both values */
894 static const uint64_t ch_subst[][2] = {
895     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
896     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
897     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
898     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
899     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
900     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
901     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
902     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
903     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
904     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
905     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
906     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
907     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
908     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
909     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
910     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
911     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
912     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
913     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
914     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
915     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
916 };
917
918 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
919 {
920     AVFilterLink *link = NULL;
921     int i, j, k;
922
923     for (i = 0; i < filter->nb_inputs; i++) {
924         link = filter->inputs[i];
925
926         if (link->type == AVMEDIA_TYPE_AUDIO &&
927             link->out_channel_layouts->nb_channel_layouts == 1)
928             break;
929     }
930     if (i == filter->nb_inputs)
931         return;
932
933     for (i = 0; i < filter->nb_outputs; i++) {
934         AVFilterLink *outlink = filter->outputs[i];
935         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
936
937         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
938             outlink->in_channel_layouts->nb_channel_layouts < 2)
939             continue;
940
941         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
942             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
943             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
944             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
945             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
946             int count_diff        = out_channels - in_channels;
947             int matched_channels, extra_channels;
948             int score = 100000;
949
950             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
951                 /* Compute score in case the input or output layout encodes
952                    a channel count; in this case the score is not altered by
953                    the computation afterwards, as in_chlayout and
954                    out_chlayout have both been set to 0 */
955                 if (FF_LAYOUT2COUNT(in_chlayout))
956                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
957                 if (FF_LAYOUT2COUNT(out_chlayout))
958                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
959                 score -= 10000 + FFABS(out_channels - in_channels) +
960                          (in_channels > out_channels ? 10000 : 0);
961                 in_chlayout = out_chlayout = 0;
962                 /* Let the remaining computation run, even if the score
963                    value is not altered */
964             }
965
966             /* channel substitution */
967             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
968                 uint64_t cmp0 = ch_subst[k][0];
969                 uint64_t cmp1 = ch_subst[k][1];
970                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
971                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
972                     in_chlayout  &= ~cmp0;
973                     out_chlayout &= ~cmp1;
974                     /* add score for channel match, minus a deduction for
975                        having to do the substitution */
976                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
977                 }
978             }
979
980             /* no penalty for LFE channel mismatch */
981             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
982                 (out_chlayout & AV_CH_LOW_FREQUENCY))
983                 score += 10;
984             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
985             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
986
987             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
988                                                                  out_chlayout);
989             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
990                                                                  (~in_chlayout));
991             score += 10 * matched_channels - 5 * extra_channels;
992
993             if (score > best_score ||
994                 (count_diff < best_count_diff && score == best_score)) {
995                 best_score = score;
996                 best_idx   = j;
997                 best_count_diff = count_diff;
998             }
999         }
1000         av_assert0(best_idx >= 0);
1001         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1002                outlink->in_channel_layouts->channel_layouts[best_idx]);
1003     }
1004
1005 }
1006
1007 static void swap_channel_layouts(AVFilterGraph *graph)
1008 {
1009     int i;
1010
1011     for (i = 0; i < graph->nb_filters; i++)
1012         swap_channel_layouts_on_filter(graph->filters[i]);
1013 }
1014
1015 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1016 {
1017     AVFilterLink *link = NULL;
1018     int format, bps;
1019     int i, j;
1020
1021     for (i = 0; i < filter->nb_inputs; i++) {
1022         link = filter->inputs[i];
1023
1024         if (link->type == AVMEDIA_TYPE_AUDIO &&
1025             link->out_formats->nb_formats == 1)
1026             break;
1027     }
1028     if (i == filter->nb_inputs)
1029         return;
1030
1031     format = link->out_formats->formats[0];
1032     bps    = av_get_bytes_per_sample(format);
1033
1034     for (i = 0; i < filter->nb_outputs; i++) {
1035         AVFilterLink *outlink = filter->outputs[i];
1036         int best_idx = -1, best_score = INT_MIN;
1037
1038         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1039             outlink->in_formats->nb_formats < 2)
1040             continue;
1041
1042         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1043             int out_format = outlink->in_formats->formats[j];
1044             int out_bps    = av_get_bytes_per_sample(out_format);
1045             int score;
1046
1047             if (av_get_packed_sample_fmt(out_format) == format ||
1048                 av_get_planar_sample_fmt(out_format) == format) {
1049                 best_idx   = j;
1050                 break;
1051             }
1052
1053             /* for s32 and float prefer double to prevent loss of information */
1054             if (bps == 4 && out_bps == 8) {
1055                 best_idx = j;
1056                 break;
1057             }
1058
1059             /* prefer closest higher or equal bps */
1060             score = -abs(out_bps - bps);
1061             if (out_bps >= bps)
1062                 score += INT_MAX/2;
1063
1064             if (score > best_score) {
1065                 best_score = score;
1066                 best_idx   = j;
1067             }
1068         }
1069         av_assert0(best_idx >= 0);
1070         FFSWAP(int, outlink->in_formats->formats[0],
1071                outlink->in_formats->formats[best_idx]);
1072     }
1073 }
1074
1075 static void swap_sample_fmts(AVFilterGraph *graph)
1076 {
1077     int i;
1078
1079     for (i = 0; i < graph->nb_filters; i++)
1080         swap_sample_fmts_on_filter(graph->filters[i]);
1081
1082 }
1083
1084 static int pick_formats(AVFilterGraph *graph)
1085 {
1086     int i, j, ret;
1087     int change;
1088
1089     do{
1090         change = 0;
1091         for (i = 0; i < graph->nb_filters; i++) {
1092             AVFilterContext *filter = graph->filters[i];
1093             if (filter->nb_inputs){
1094                 for (j = 0; j < filter->nb_inputs; j++){
1095                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1096                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1097                             return ret;
1098                         change = 1;
1099                     }
1100                 }
1101             }
1102             if (filter->nb_outputs){
1103                 for (j = 0; j < filter->nb_outputs; j++){
1104                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1105                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1106                             return ret;
1107                         change = 1;
1108                     }
1109                 }
1110             }
1111             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1112                 for (j = 0; j < filter->nb_outputs; j++) {
1113                     if(filter->outputs[j]->format<0) {
1114                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1115                             return ret;
1116                         change = 1;
1117                     }
1118                 }
1119             }
1120         }
1121     }while(change);
1122
1123     for (i = 0; i < graph->nb_filters; i++) {
1124         AVFilterContext *filter = graph->filters[i];
1125
1126         for (j = 0; j < filter->nb_inputs; j++)
1127             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1128                 return ret;
1129         for (j = 0; j < filter->nb_outputs; j++)
1130             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1131                 return ret;
1132     }
1133     return 0;
1134 }
1135
1136 /**
1137  * Configure the formats of all the links in the graph.
1138  */
1139 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1140 {
1141     int ret;
1142
1143     /* find supported formats from sub-filters, and merge along links */
1144     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1145         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1146     if (ret < 0)
1147         return ret;
1148
1149     /* Once everything is merged, it's possible that we'll still have
1150      * multiple valid media format choices. We try to minimize the amount
1151      * of format conversion inside filters */
1152     if ((ret = reduce_formats(graph)) < 0)
1153         return ret;
1154
1155     /* for audio filters, ensure the best format, sample rate and channel layout
1156      * is selected */
1157     swap_sample_fmts(graph);
1158     swap_samplerates(graph);
1159     swap_channel_layouts(graph);
1160
1161     if ((ret = pick_formats(graph)) < 0)
1162         return ret;
1163
1164     return 0;
1165 }
1166
1167 static int graph_config_pointers(AVFilterGraph *graph,
1168                                              AVClass *log_ctx)
1169 {
1170     unsigned i, j;
1171     int sink_links_count = 0, n = 0;
1172     AVFilterContext *f;
1173     AVFilterLink **sinks;
1174
1175     for (i = 0; i < graph->nb_filters; i++) {
1176         f = graph->filters[i];
1177         for (j = 0; j < f->nb_inputs; j++) {
1178             f->inputs[j]->graph     = graph;
1179             f->inputs[j]->age_index = -1;
1180         }
1181         for (j = 0; j < f->nb_outputs; j++) {
1182             f->outputs[j]->graph    = graph;
1183             f->outputs[j]->age_index= -1;
1184         }
1185         if (!f->nb_outputs) {
1186             if (f->nb_inputs > INT_MAX - sink_links_count)
1187                 return AVERROR(EINVAL);
1188             sink_links_count += f->nb_inputs;
1189         }
1190     }
1191     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1192     if (!sinks)
1193         return AVERROR(ENOMEM);
1194     for (i = 0; i < graph->nb_filters; i++) {
1195         f = graph->filters[i];
1196         if (!f->nb_outputs) {
1197             for (j = 0; j < f->nb_inputs; j++) {
1198                 sinks[n] = f->inputs[j];
1199                 f->inputs[j]->age_index = n++;
1200             }
1201         }
1202     }
1203     av_assert0(n == sink_links_count);
1204     graph->sink_links       = sinks;
1205     graph->sink_links_count = sink_links_count;
1206     return 0;
1207 }
1208
1209 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1210 {
1211     AVFilterContext *f;
1212     int i, j, ret;
1213     int fifo_count = 0;
1214
1215     for (i = 0; i < graph->nb_filters; i++) {
1216         f = graph->filters[i];
1217
1218         for (j = 0; j < f->nb_inputs; j++) {
1219             AVFilterLink *link = f->inputs[j];
1220             AVFilterContext *fifo_ctx;
1221             AVFilter *fifo;
1222             char name[32];
1223
1224             if (!link->dstpad->needs_fifo)
1225                 continue;
1226
1227             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1228                    avfilter_get_by_name("fifo") :
1229                    avfilter_get_by_name("afifo");
1230
1231             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1232
1233             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1234                                                NULL, graph);
1235             if (ret < 0)
1236                 return ret;
1237
1238             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1239             if (ret < 0)
1240                 return ret;
1241         }
1242     }
1243
1244     return 0;
1245 }
1246
1247 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1248 {
1249     int ret;
1250
1251     if ((ret = graph_check_validity(graphctx, log_ctx)))
1252         return ret;
1253     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1254         return ret;
1255     if ((ret = graph_config_formats(graphctx, log_ctx)))
1256         return ret;
1257     if ((ret = graph_config_links(graphctx, log_ctx)))
1258         return ret;
1259     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1260         return ret;
1261
1262     return 0;
1263 }
1264
1265 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1266 {
1267     int i, r = AVERROR(ENOSYS);
1268
1269     if (!graph)
1270         return r;
1271
1272     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1273         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1274         if (r != AVERROR(ENOSYS))
1275             return r;
1276     }
1277
1278     if (res_len && res)
1279         res[0] = 0;
1280
1281     for (i = 0; i < graph->nb_filters; i++) {
1282         AVFilterContext *filter = graph->filters[i];
1283         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1284             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1285             if (r != AVERROR(ENOSYS)) {
1286                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1287                     return r;
1288             }
1289         }
1290     }
1291
1292     return r;
1293 }
1294
1295 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1296 {
1297     int i;
1298
1299     if(!graph)
1300         return 0;
1301
1302     for (i = 0; i < graph->nb_filters; i++) {
1303         AVFilterContext *filter = graph->filters[i];
1304         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1305             AVFilterCommand **queue = &filter->command_queue, *next;
1306             while (*queue && (*queue)->time <= ts)
1307                 queue = &(*queue)->next;
1308             next = *queue;
1309             *queue = av_mallocz(sizeof(AVFilterCommand));
1310             (*queue)->command = av_strdup(command);
1311             (*queue)->arg     = av_strdup(arg);
1312             (*queue)->time    = ts;
1313             (*queue)->flags   = flags;
1314             (*queue)->next    = next;
1315             if(flags & AVFILTER_CMD_FLAG_ONE)
1316                 return 0;
1317         }
1318     }
1319
1320     return 0;
1321 }
1322
1323 static void heap_bubble_up(AVFilterGraph *graph,
1324                            AVFilterLink *link, int index)
1325 {
1326     AVFilterLink **links = graph->sink_links;
1327
1328     av_assert0(index >= 0);
1329
1330     while (index) {
1331         int parent = (index - 1) >> 1;
1332         if (links[parent]->current_pts_us >= link->current_pts_us)
1333             break;
1334         links[index] = links[parent];
1335         links[index]->age_index = index;
1336         index = parent;
1337     }
1338     links[index] = link;
1339     link->age_index = index;
1340 }
1341
1342 static void heap_bubble_down(AVFilterGraph *graph,
1343                              AVFilterLink *link, int index)
1344 {
1345     AVFilterLink **links = graph->sink_links;
1346
1347     av_assert0(index >= 0);
1348
1349     while (1) {
1350         int child = 2 * index + 1;
1351         if (child >= graph->sink_links_count)
1352             break;
1353         if (child + 1 < graph->sink_links_count &&
1354             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1355             child++;
1356         if (link->current_pts_us < links[child]->current_pts_us)
1357             break;
1358         links[index] = links[child];
1359         links[index]->age_index = index;
1360         index = child;
1361     }
1362     links[index] = link;
1363     link->age_index = index;
1364 }
1365
1366 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1367 {
1368     heap_bubble_up  (graph, link, link->age_index);
1369     heap_bubble_down(graph, link, link->age_index);
1370 }
1371
1372
1373 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1374 {
1375     AVFilterLink *oldest = graph->sink_links[0];
1376     int r;
1377
1378     while (graph->sink_links_count) {
1379         oldest = graph->sink_links[0];
1380         r = ff_request_frame(oldest);
1381         if (r != AVERROR_EOF)
1382             break;
1383         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1384                oldest->dst ? oldest->dst->name : "unknown",
1385                oldest->dstpad ? oldest->dstpad->name : "unknown");
1386         /* EOF: remove the link from the heap */
1387         if (oldest->age_index < --graph->sink_links_count)
1388             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1389                              oldest->age_index);
1390         oldest->age_index = -1;
1391     }
1392     if (!graph->sink_links_count)
1393         return AVERROR_EOF;
1394     av_assert1(oldest->age_index >= 0);
1395     while (oldest->frame_wanted_out) {
1396         r = ff_filter_graph_run_once(graph);
1397         if (r < 0)
1398             return r;
1399     }
1400     return 0;
1401 }
1402
1403 static AVFilterLink *graph_run_once_find_filter(AVFilterGraph *graph)
1404 {
1405     unsigned i, j;
1406     AVFilterContext *f;
1407
1408     /* TODO: replace scanning the graph with a priority list */
1409     for (i = 0; i < graph->nb_filters; i++) {
1410         f = graph->filters[i];
1411         for (j = 0; j < f->nb_outputs; j++)
1412             if (f->outputs[j]->frame_wanted_in)
1413                 return f->outputs[j];
1414     }
1415     for (i = 0; i < graph->nb_filters; i++) {
1416         f = graph->filters[i];
1417         for (j = 0; j < f->nb_outputs; j++)
1418             if (f->outputs[j]->frame_wanted_out)
1419                 return f->outputs[j];
1420     }
1421     return NULL;
1422 }
1423
1424 int ff_filter_graph_run_once(AVFilterGraph *graph)
1425 {
1426     AVFilterLink *link;
1427     int ret;
1428
1429     link = graph_run_once_find_filter(graph);
1430     if (!link) {
1431         av_log(NULL, AV_LOG_WARNING, "Useless run of a filter graph\n");
1432         return AVERROR(EAGAIN);
1433     }
1434     ret = ff_request_frame_to_filter(link);
1435     if (ret == AVERROR_EOF)
1436         /* local EOF will be forwarded through request_frame() /
1437            set_status() until it reaches the sink */
1438         ret = 0;
1439     return ret < 0 ? ret : 1;
1440 }