avformat: add Argonaut Games CVG muxer
[ffmpeg.git] / libavfilter / avfiltergraph.c
1 /*
2  * filter graphs
3  * Copyright (c) 2008 Vitor Sessak
4  * Copyright (c) 2007 Bobby Bingham
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #include "config.h"
24
25 #include <string.h>
26
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/bprint.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/pixdesc.h"
35
36 #define FF_INTERNAL_FIELDS 1
37 #include "framequeue.h"
38
39 #include "avfilter.h"
40 #include "buffersink.h"
41 #include "formats.h"
42 #include "internal.h"
43 #include "thread.h"
44
45 #define OFFSET(x) offsetof(AVFilterGraph, x)
46 #define F AV_OPT_FLAG_FILTERING_PARAM
47 #define V AV_OPT_FLAG_VIDEO_PARAM
48 #define A AV_OPT_FLAG_AUDIO_PARAM
49 static const AVOption filtergraph_options[] = {
50     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
51         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, F|V|A, "thread_type" },
52         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = F|V|A, .unit = "thread_type" },
53     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
54         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, F|V|A },
55     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
56         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|V },
57     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
58         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|A },
59     { NULL },
60 };
61
62 static const AVClass filtergraph_class = {
63     .class_name = "AVFilterGraph",
64     .item_name  = av_default_item_name,
65     .version    = LIBAVUTIL_VERSION_INT,
66     .option     = filtergraph_options,
67     .category   = AV_CLASS_CATEGORY_FILTER,
68 };
69
70 #if !HAVE_THREADS
71 void ff_graph_thread_free(AVFilterGraph *graph)
72 {
73 }
74
75 int ff_graph_thread_init(AVFilterGraph *graph)
76 {
77     graph->thread_type = 0;
78     graph->nb_threads  = 1;
79     return 0;
80 }
81 #endif
82
83 AVFilterGraph *avfilter_graph_alloc(void)
84 {
85     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
86     if (!ret)
87         return NULL;
88
89     ret->internal = av_mallocz(sizeof(*ret->internal));
90     if (!ret->internal) {
91         av_freep(&ret);
92         return NULL;
93     }
94
95     ret->av_class = &filtergraph_class;
96     av_opt_set_defaults(ret);
97     ff_framequeue_global_init(&ret->internal->frame_queues);
98
99     return ret;
100 }
101
102 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
103 {
104     int i, j;
105     for (i = 0; i < graph->nb_filters; i++) {
106         if (graph->filters[i] == filter) {
107             FFSWAP(AVFilterContext*, graph->filters[i],
108                    graph->filters[graph->nb_filters - 1]);
109             graph->nb_filters--;
110             filter->graph = NULL;
111             for (j = 0; j<filter->nb_outputs; j++)
112                 if (filter->outputs[j])
113                     filter->outputs[j]->graph = NULL;
114
115             return;
116         }
117     }
118 }
119
120 void avfilter_graph_free(AVFilterGraph **graph)
121 {
122     if (!*graph)
123         return;
124
125     while ((*graph)->nb_filters)
126         avfilter_free((*graph)->filters[0]);
127
128     ff_graph_thread_free(*graph);
129
130     av_freep(&(*graph)->sink_links);
131
132     av_freep(&(*graph)->scale_sws_opts);
133     av_freep(&(*graph)->aresample_swr_opts);
134     av_freep(&(*graph)->filters);
135     av_freep(&(*graph)->internal);
136     av_freep(graph);
137 }
138
139 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
140                                  const char *name, const char *args, void *opaque,
141                                  AVFilterGraph *graph_ctx)
142 {
143     int ret;
144
145     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
146     if (!*filt_ctx)
147         return AVERROR(ENOMEM);
148
149     ret = avfilter_init_str(*filt_ctx, args);
150     if (ret < 0)
151         goto fail;
152
153     return 0;
154
155 fail:
156     if (*filt_ctx)
157         avfilter_free(*filt_ctx);
158     *filt_ctx = NULL;
159     return ret;
160 }
161
162 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
163 {
164     graph->disable_auto_convert = flags;
165 }
166
167 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
168                                              const AVFilter *filter,
169                                              const char *name)
170 {
171     AVFilterContext **filters, *s;
172
173     if (graph->thread_type && !graph->internal->thread_execute) {
174         if (graph->execute) {
175             graph->internal->thread_execute = graph->execute;
176         } else {
177             int ret = ff_graph_thread_init(graph);
178             if (ret < 0) {
179                 av_log(graph, AV_LOG_ERROR, "Error initializing threading: %s.\n", av_err2str(ret));
180                 return NULL;
181             }
182         }
183     }
184
185     s = ff_filter_alloc(filter, name);
186     if (!s)
187         return NULL;
188
189     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
190     if (!filters) {
191         avfilter_free(s);
192         return NULL;
193     }
194
195     graph->filters = filters;
196     graph->filters[graph->nb_filters++] = s;
197
198     s->graph = graph;
199
200     return s;
201 }
202
203 /**
204  * Check for the validity of graph.
205  *
206  * A graph is considered valid if all its input and output pads are
207  * connected.
208  *
209  * @return >= 0 in case of success, a negative value otherwise
210  */
211 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
212 {
213     AVFilterContext *filt;
214     int i, j;
215
216     for (i = 0; i < graph->nb_filters; i++) {
217         const AVFilterPad *pad;
218         filt = graph->filters[i];
219
220         for (j = 0; j < filt->nb_inputs; j++) {
221             if (!filt->inputs[j] || !filt->inputs[j]->src) {
222                 pad = &filt->input_pads[j];
223                 av_log(log_ctx, AV_LOG_ERROR,
224                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
225                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
226                 return AVERROR(EINVAL);
227             }
228         }
229
230         for (j = 0; j < filt->nb_outputs; j++) {
231             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
232                 pad = &filt->output_pads[j];
233                 av_log(log_ctx, AV_LOG_ERROR,
234                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
235                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
236                 return AVERROR(EINVAL);
237             }
238         }
239     }
240
241     return 0;
242 }
243
244 /**
245  * Configure all the links of graphctx.
246  *
247  * @return >= 0 in case of success, a negative value otherwise
248  */
249 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
250 {
251     AVFilterContext *filt;
252     int i, ret;
253
254     for (i = 0; i < graph->nb_filters; i++) {
255         filt = graph->filters[i];
256
257         if (!filt->nb_outputs) {
258             if ((ret = avfilter_config_links(filt)))
259                 return ret;
260         }
261     }
262
263     return 0;
264 }
265
266 static int graph_check_links(AVFilterGraph *graph, AVClass *log_ctx)
267 {
268     AVFilterContext *f;
269     AVFilterLink *l;
270     unsigned i, j;
271     int ret;
272
273     for (i = 0; i < graph->nb_filters; i++) {
274         f = graph->filters[i];
275         for (j = 0; j < f->nb_outputs; j++) {
276             l = f->outputs[j];
277             if (l->type == AVMEDIA_TYPE_VIDEO) {
278                 ret = av_image_check_size2(l->w, l->h, INT64_MAX, l->format, 0, f);
279                 if (ret < 0)
280                     return ret;
281             }
282         }
283     }
284     return 0;
285 }
286
287 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
288 {
289     int i;
290
291     for (i = 0; i < graph->nb_filters; i++)
292         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
293             return graph->filters[i];
294
295     return NULL;
296 }
297
298 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
299 {
300     if (!l)
301         return;
302     if (l->nb_channel_layouts) {
303         if (l->all_layouts || l->all_counts)
304             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
305         l->all_layouts = l->all_counts = 0;
306     } else {
307         if (l->all_counts && !l->all_layouts)
308             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
309         l->all_layouts = 1;
310     }
311 }
312
313 static int filter_link_check_formats(void *log, AVFilterLink *link, AVFilterFormatsConfig *cfg)
314 {
315     int ret;
316
317     switch (link->type) {
318
319     case AVMEDIA_TYPE_VIDEO:
320         if ((ret = ff_formats_check_pixel_formats(log, cfg->formats)) < 0)
321             return ret;
322         break;
323
324     case AVMEDIA_TYPE_AUDIO:
325         if ((ret = ff_formats_check_sample_formats(log, cfg->formats)) < 0 ||
326             (ret = ff_formats_check_sample_rates(log, cfg->samplerates)) < 0 ||
327             (ret = ff_formats_check_channel_layouts(log, cfg->channel_layouts)) < 0)
328             return ret;
329         break;
330
331     default:
332         av_assert0(!"reached");
333     }
334     return 0;
335 }
336
337 /**
338  * Check the validity of the formats / etc. lists set by query_formats().
339  *
340  * In particular, check they do not contain any redundant element.
341  */
342 static int filter_check_formats(AVFilterContext *ctx)
343 {
344     unsigned i;
345     int ret;
346
347     for (i = 0; i < ctx->nb_inputs; i++) {
348         ret = filter_link_check_formats(ctx, ctx->inputs[i], &ctx->inputs[i]->outcfg);
349         if (ret < 0)
350             return ret;
351     }
352     for (i = 0; i < ctx->nb_outputs; i++) {
353         ret = filter_link_check_formats(ctx, ctx->outputs[i], &ctx->outputs[i]->incfg);
354         if (ret < 0)
355             return ret;
356     }
357     return 0;
358 }
359
360 static int filter_query_formats(AVFilterContext *ctx)
361 {
362     int ret, i;
363     AVFilterFormats *formats;
364     AVFilterChannelLayouts *chlayouts;
365     AVFilterFormats *samplerates;
366     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
367                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
368                             AVMEDIA_TYPE_VIDEO;
369
370     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
371         if (ret != AVERROR(EAGAIN))
372             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
373                    ctx->name, av_err2str(ret));
374         return ret;
375     }
376     ret = filter_check_formats(ctx);
377     if (ret < 0)
378         return ret;
379
380     for (i = 0; i < ctx->nb_inputs; i++)
381         sanitize_channel_layouts(ctx, ctx->inputs[i]->outcfg.channel_layouts);
382     for (i = 0; i < ctx->nb_outputs; i++)
383         sanitize_channel_layouts(ctx, ctx->outputs[i]->incfg.channel_layouts);
384
385     formats = ff_all_formats(type);
386     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
387         return ret;
388     if (type == AVMEDIA_TYPE_AUDIO) {
389         samplerates = ff_all_samplerates();
390         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
391             return ret;
392         chlayouts = ff_all_channel_layouts();
393         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
394             return ret;
395     }
396     return 0;
397 }
398
399 static int formats_declared(AVFilterContext *f)
400 {
401     int i;
402
403     for (i = 0; i < f->nb_inputs; i++) {
404         if (!f->inputs[i]->outcfg.formats)
405             return 0;
406         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
407             !(f->inputs[i]->outcfg.samplerates &&
408               f->inputs[i]->outcfg.channel_layouts))
409             return 0;
410     }
411     for (i = 0; i < f->nb_outputs; i++) {
412         if (!f->outputs[i]->incfg.formats)
413             return 0;
414         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
415             !(f->outputs[i]->incfg.samplerates &&
416               f->outputs[i]->incfg.channel_layouts))
417             return 0;
418     }
419     return 1;
420 }
421
422 /**
423  * Perform one round of query_formats() and merging formats lists on the
424  * filter graph.
425  * @return  >=0 if all links formats lists could be queried and merged;
426  *          AVERROR(EAGAIN) some progress was made in the queries or merging
427  *          and a later call may succeed;
428  *          AVERROR(EIO) (may be changed) plus a log message if no progress
429  *          was made and the negotiation is stuck;
430  *          a negative error code if some other error happened
431  */
432 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
433 {
434     int i, j, ret;
435     int scaler_count = 0, resampler_count = 0;
436     int count_queried = 0;        /* successful calls to query_formats() */
437     int count_merged = 0;         /* successful merge of formats lists */
438     int count_already_merged = 0; /* lists already merged */
439     int count_delayed = 0;        /* lists that need to be merged later */
440
441     for (i = 0; i < graph->nb_filters; i++) {
442         AVFilterContext *f = graph->filters[i];
443         if (formats_declared(f))
444             continue;
445         if (f->filter->query_formats)
446             ret = filter_query_formats(f);
447         else
448             ret = ff_default_query_formats(f);
449         if (ret < 0 && ret != AVERROR(EAGAIN))
450             return ret;
451         /* note: EAGAIN could indicate a partial success, not counted yet */
452         count_queried += ret >= 0;
453     }
454
455     /* go through and merge as many format lists as possible */
456     for (i = 0; i < graph->nb_filters; i++) {
457         AVFilterContext *filter = graph->filters[i];
458
459         for (j = 0; j < filter->nb_inputs; j++) {
460             AVFilterLink *link = filter->inputs[j];
461             int convert_needed = 0;
462
463             if (!link)
464                 continue;
465
466             if (link->incfg.formats != link->outcfg.formats
467                 && link->incfg.formats && link->outcfg.formats)
468                 if (!ff_can_merge_formats(link->incfg.formats, link->outcfg.formats,
469                                           link->type))
470                     convert_needed = 1;
471             if (link->type == AVMEDIA_TYPE_AUDIO) {
472                 if (link->incfg.samplerates != link->outcfg.samplerates
473                     && link->incfg.samplerates && link->outcfg.samplerates)
474                     if (!ff_can_merge_samplerates(link->incfg.samplerates,
475                                                   link->outcfg.samplerates))
476                         convert_needed = 1;
477             }
478
479 #define CHECKED_MERGE(field, ...) ((ret = ff_merge_ ## field(__VA_ARGS__)) <= 0)
480 #define MERGE_DISPATCH(field, ...)                                           \
481             if (!(link->incfg.field && link->outcfg.field)) {                \
482                 count_delayed++;                                             \
483             } else if (link->incfg.field == link->outcfg.field) {            \
484                 count_already_merged++;                                      \
485             } else if (!convert_needed) {                                    \
486                 count_merged++;                                              \
487                 if (CHECKED_MERGE(field, __VA_ARGS__)) {                     \
488                     if (ret < 0)                                             \
489                         return ret;                                          \
490                     convert_needed = 1;                                      \
491                 }                                                            \
492             }
493
494             if (link->type == AVMEDIA_TYPE_AUDIO) {
495                 MERGE_DISPATCH(channel_layouts, link->incfg.channel_layouts,
496                                                 link->outcfg.channel_layouts)
497                 MERGE_DISPATCH(samplerates, link->incfg.samplerates,
498                                             link->outcfg.samplerates)
499             }
500             MERGE_DISPATCH(formats, link->incfg.formats,
501                            link->outcfg.formats, link->type)
502 #undef MERGE_DISPATCH
503
504             if (convert_needed) {
505                 AVFilterContext *convert;
506                 const AVFilter *filter;
507                 AVFilterLink *inlink, *outlink;
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_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_resampler_%d",
543                              resampler_count++);
544                     if ((ret = avfilter_graph_create_filter(&convert, filter,
545                                                             inst_name, graph->aresample_swr_opts,
546                                                             NULL, graph)) < 0)
547                         return ret;
548                     break;
549                 default:
550                     return AVERROR(EINVAL);
551                 }
552
553                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
554                     return ret;
555
556                 if ((ret = filter_query_formats(convert)) < 0)
557                     return ret;
558
559                 inlink  = convert->inputs[0];
560                 outlink = convert->outputs[0];
561                 av_assert0( inlink->incfg.formats->refcount > 0);
562                 av_assert0( inlink->outcfg.formats->refcount > 0);
563                 av_assert0(outlink->incfg.formats->refcount > 0);
564                 av_assert0(outlink->outcfg.formats->refcount > 0);
565                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
566                     av_assert0( inlink-> incfg.samplerates->refcount > 0);
567                     av_assert0( inlink->outcfg.samplerates->refcount > 0);
568                     av_assert0(outlink-> incfg.samplerates->refcount > 0);
569                     av_assert0(outlink->outcfg.samplerates->refcount > 0);
570                     av_assert0( inlink-> incfg.channel_layouts->refcount > 0);
571                     av_assert0( inlink->outcfg.channel_layouts->refcount > 0);
572                     av_assert0(outlink-> incfg.channel_layouts->refcount > 0);
573                     av_assert0(outlink->outcfg.channel_layouts->refcount > 0);
574                 }
575                 if (CHECKED_MERGE(formats, inlink->incfg.formats,
576                                   inlink->outcfg.formats, inlink->type)         ||
577                     CHECKED_MERGE(formats, outlink->incfg.formats,
578                                   outlink->outcfg.formats, outlink->type)       ||
579                     inlink->type == AVMEDIA_TYPE_AUDIO &&
580                     (CHECKED_MERGE(samplerates, inlink->incfg.samplerates,
581                                                 inlink->outcfg.samplerates)  ||
582                      CHECKED_MERGE(channel_layouts, inlink->incfg.channel_layouts,
583                                    inlink->outcfg.channel_layouts))             ||
584                     outlink->type == AVMEDIA_TYPE_AUDIO &&
585                     (CHECKED_MERGE(samplerates, outlink->incfg.samplerates,
586                                                 outlink->outcfg.samplerates) ||
587                      CHECKED_MERGE(channel_layouts, outlink->incfg.channel_layouts,
588                                                     outlink->outcfg.channel_layouts))) {
589                     if (ret < 0)
590                         return ret;
591                     av_log(log_ctx, AV_LOG_ERROR,
592                            "Impossible to convert between the formats supported by the filter "
593                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
594                     return AVERROR(ENOSYS);
595                 }
596             }
597         }
598     }
599
600     av_log(graph, AV_LOG_DEBUG, "query_formats: "
601            "%d queried, %d merged, %d already done, %d delayed\n",
602            count_queried, count_merged, count_already_merged, count_delayed);
603     if (count_delayed) {
604         AVBPrint bp;
605
606         /* if count_queried > 0, one filter at least did set its formats,
607            that will give additional information to its neighbour;
608            if count_merged > 0, one pair of formats lists at least was merged,
609            that will give additional information to all connected filters;
610            in both cases, progress was made and a new round must be done */
611         if (count_queried || count_merged)
612             return AVERROR(EAGAIN);
613         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
614         for (i = 0; i < graph->nb_filters; i++)
615             if (!formats_declared(graph->filters[i]))
616                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
617                           graph->filters[i]->name);
618         av_log(graph, AV_LOG_ERROR,
619                "The following filters could not choose their formats: %s\n"
620                "Consider inserting the (a)format filter near their input or "
621                "output.\n", bp.str);
622         return AVERROR(EIO);
623     }
624     return 0;
625 }
626
627 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
628 {
629     int score = 0;
630
631     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
632         score ++;
633
634     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
635         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
636     }else
637         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
638
639     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
640         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
641         score += 20;
642
643     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
644         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
645         score += 2;
646
647     return score;
648 }
649
650 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
651                                                      enum AVSampleFormat src_fmt)
652 {
653     int score1, score2;
654
655     score1 = get_fmt_score(dst_fmt1, src_fmt);
656     score2 = get_fmt_score(dst_fmt2, src_fmt);
657
658     return score1 < score2 ? dst_fmt1 : dst_fmt2;
659 }
660
661 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
662 {
663     if (!link || !link->incfg.formats)
664         return 0;
665
666     if (link->type == AVMEDIA_TYPE_VIDEO) {
667         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
668             //FIXME: This should check for AV_PIX_FMT_FLAG_ALPHA after PAL8 pixel format without alpha is implemented
669             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
670             enum AVPixelFormat best= AV_PIX_FMT_NONE;
671             int i;
672             for (i = 0; i < link->incfg.formats->nb_formats; i++) {
673                 enum AVPixelFormat p = link->incfg.formats->formats[i];
674                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
675             }
676             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
677                    av_get_pix_fmt_name(best), link->incfg.formats->nb_formats,
678                    av_get_pix_fmt_name(ref->format), has_alpha);
679             link->incfg.formats->formats[0] = best;
680         }
681     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
682         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
683             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
684             int i;
685             for (i = 0; i < link->incfg.formats->nb_formats; i++) {
686                 enum AVSampleFormat p = link->incfg.formats->formats[i];
687                 best = find_best_sample_fmt_of_2(best, p, ref->format);
688             }
689             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
690                    av_get_sample_fmt_name(best), link->incfg.formats->nb_formats,
691                    av_get_sample_fmt_name(ref->format));
692             link->incfg.formats->formats[0] = best;
693         }
694     }
695
696     link->incfg.formats->nb_formats = 1;
697     link->format = link->incfg.formats->formats[0];
698
699     if (link->type == AVMEDIA_TYPE_AUDIO) {
700         if (!link->incfg.samplerates->nb_formats) {
701             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
702                    " the link between filters %s and %s.\n", link->src->name,
703                    link->dst->name);
704             return AVERROR(EINVAL);
705         }
706         link->incfg.samplerates->nb_formats = 1;
707         link->sample_rate = link->incfg.samplerates->formats[0];
708
709         if (link->incfg.channel_layouts->all_layouts) {
710             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
711                    " the link between filters %s and %s.\n", link->src->name,
712                    link->dst->name);
713             if (!link->incfg.channel_layouts->all_counts)
714                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
715                        "supported, try specifying a channel layout using "
716                        "'aformat=channel_layouts=something'.\n");
717             return AVERROR(EINVAL);
718         }
719         link->incfg.channel_layouts->nb_channel_layouts = 1;
720         link->channel_layout = link->incfg.channel_layouts->channel_layouts[0];
721         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
722             link->channel_layout = 0;
723         else
724             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
725     }
726
727     ff_formats_unref(&link->incfg.formats);
728     ff_formats_unref(&link->outcfg.formats);
729     ff_formats_unref(&link->incfg.samplerates);
730     ff_formats_unref(&link->outcfg.samplerates);
731     ff_channel_layouts_unref(&link->incfg.channel_layouts);
732     ff_channel_layouts_unref(&link->outcfg.channel_layouts);
733
734     return 0;
735 }
736
737 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
738 do {                                                                   \
739     for (i = 0; i < filter->nb_inputs; i++) {                          \
740         AVFilterLink *link = filter->inputs[i];                        \
741         fmt_type fmt;                                                  \
742                                                                        \
743         if (!link->outcfg.list || link->outcfg.list->nb != 1)          \
744             continue;                                                  \
745         fmt = link->outcfg.list->var[0];                               \
746                                                                        \
747         for (j = 0; j < filter->nb_outputs; j++) {                     \
748             AVFilterLink *out_link = filter->outputs[j];               \
749             list_type *fmts;                                           \
750                                                                        \
751             if (link->type != out_link->type ||                        \
752                 out_link->incfg.list->nb == 1)                         \
753                 continue;                                              \
754             fmts = out_link->incfg.list;                               \
755                                                                        \
756             if (!out_link->incfg.list->nb) {                           \
757                 if ((ret = add_format(&out_link->incfg.list, fmt)) < 0)\
758                     return ret;                                        \
759                 ret = 1;                                               \
760                 break;                                                 \
761             }                                                          \
762                                                                        \
763             for (k = 0; k < out_link->incfg.list->nb; k++)             \
764                 if (fmts->var[k] == fmt) {                             \
765                     fmts->var[0]  = fmt;                               \
766                     fmts->nb = 1;                                      \
767                     ret = 1;                                           \
768                     break;                                             \
769                 }                                                      \
770         }                                                              \
771     }                                                                  \
772 } while (0)
773
774 static int reduce_formats_on_filter(AVFilterContext *filter)
775 {
776     int i, j, k, ret = 0;
777
778     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
779                    nb_formats, ff_add_format);
780     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
781                    nb_formats, ff_add_format);
782
783     /* reduce channel layouts */
784     for (i = 0; i < filter->nb_inputs; i++) {
785         AVFilterLink *inlink = filter->inputs[i];
786         uint64_t fmt;
787
788         if (!inlink->outcfg.channel_layouts ||
789             inlink->outcfg.channel_layouts->nb_channel_layouts != 1)
790             continue;
791         fmt = inlink->outcfg.channel_layouts->channel_layouts[0];
792
793         for (j = 0; j < filter->nb_outputs; j++) {
794             AVFilterLink *outlink = filter->outputs[j];
795             AVFilterChannelLayouts *fmts;
796
797             fmts = outlink->incfg.channel_layouts;
798             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
799                 continue;
800
801             if (fmts->all_layouts &&
802                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
803                 /* Turn the infinite list into a singleton */
804                 fmts->all_layouts = fmts->all_counts  = 0;
805                 if (ff_add_channel_layout(&outlink->incfg.channel_layouts, fmt) < 0)
806                     ret = 1;
807                 break;
808             }
809
810             for (k = 0; k < outlink->incfg.channel_layouts->nb_channel_layouts; k++) {
811                 if (fmts->channel_layouts[k] == fmt) {
812                     fmts->channel_layouts[0]  = fmt;
813                     fmts->nb_channel_layouts = 1;
814                     ret = 1;
815                     break;
816                 }
817             }
818         }
819     }
820
821     return ret;
822 }
823
824 static int reduce_formats(AVFilterGraph *graph)
825 {
826     int i, reduced, ret;
827
828     do {
829         reduced = 0;
830
831         for (i = 0; i < graph->nb_filters; i++) {
832             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
833                 return ret;
834             reduced |= ret;
835         }
836     } while (reduced);
837
838     return 0;
839 }
840
841 static void swap_samplerates_on_filter(AVFilterContext *filter)
842 {
843     AVFilterLink *link = NULL;
844     int sample_rate;
845     int i, j;
846
847     for (i = 0; i < filter->nb_inputs; i++) {
848         link = filter->inputs[i];
849
850         if (link->type == AVMEDIA_TYPE_AUDIO &&
851             link->outcfg.samplerates->nb_formats== 1)
852             break;
853     }
854     if (i == filter->nb_inputs)
855         return;
856
857     sample_rate = link->outcfg.samplerates->formats[0];
858
859     for (i = 0; i < filter->nb_outputs; i++) {
860         AVFilterLink *outlink = filter->outputs[i];
861         int best_idx, best_diff = INT_MAX;
862
863         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
864             outlink->incfg.samplerates->nb_formats < 2)
865             continue;
866
867         for (j = 0; j < outlink->incfg.samplerates->nb_formats; j++) {
868             int diff = abs(sample_rate - outlink->incfg.samplerates->formats[j]);
869
870             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
871
872             if (diff < best_diff) {
873                 best_diff = diff;
874                 best_idx  = j;
875             }
876         }
877         FFSWAP(int, outlink->incfg.samplerates->formats[0],
878                outlink->incfg.samplerates->formats[best_idx]);
879     }
880 }
881
882 static void swap_samplerates(AVFilterGraph *graph)
883 {
884     int i;
885
886     for (i = 0; i < graph->nb_filters; i++)
887         swap_samplerates_on_filter(graph->filters[i]);
888 }
889
890 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
891 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
892 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
893 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
894 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
895 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
896 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
897
898 /* allowable substitutions for channel pairs when comparing layouts,
899  * ordered by priority for both values */
900 static const uint64_t ch_subst[][2] = {
901     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
902     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
903     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
904     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
905     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
906     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
907     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
908     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
909     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
910     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
911     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
912     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
913     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
914     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
915     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
916     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
917     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
918     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
919     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
920     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
921     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
922 };
923
924 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
925 {
926     AVFilterLink *link = NULL;
927     int i, j, k;
928
929     for (i = 0; i < filter->nb_inputs; i++) {
930         link = filter->inputs[i];
931
932         if (link->type == AVMEDIA_TYPE_AUDIO &&
933             link->outcfg.channel_layouts->nb_channel_layouts == 1)
934             break;
935     }
936     if (i == filter->nb_inputs)
937         return;
938
939     for (i = 0; i < filter->nb_outputs; i++) {
940         AVFilterLink *outlink = filter->outputs[i];
941         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
942
943         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
944             outlink->incfg.channel_layouts->nb_channel_layouts < 2)
945             continue;
946
947         for (j = 0; j < outlink->incfg.channel_layouts->nb_channel_layouts; j++) {
948             uint64_t  in_chlayout = link->outcfg.channel_layouts->channel_layouts[0];
949             uint64_t out_chlayout = outlink->incfg.channel_layouts->channel_layouts[j];
950             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
951             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
952             int count_diff        = out_channels - in_channels;
953             int matched_channels, extra_channels;
954             int score = 100000;
955
956             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
957                 /* Compute score in case the input or output layout encodes
958                    a channel count; in this case the score is not altered by
959                    the computation afterwards, as in_chlayout and
960                    out_chlayout have both been set to 0 */
961                 if (FF_LAYOUT2COUNT(in_chlayout))
962                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
963                 if (FF_LAYOUT2COUNT(out_chlayout))
964                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
965                 score -= 10000 + FFABS(out_channels - in_channels) +
966                          (in_channels > out_channels ? 10000 : 0);
967                 in_chlayout = out_chlayout = 0;
968                 /* Let the remaining computation run, even if the score
969                    value is not altered */
970             }
971
972             /* channel substitution */
973             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
974                 uint64_t cmp0 = ch_subst[k][0];
975                 uint64_t cmp1 = ch_subst[k][1];
976                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
977                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
978                     in_chlayout  &= ~cmp0;
979                     out_chlayout &= ~cmp1;
980                     /* add score for channel match, minus a deduction for
981                        having to do the substitution */
982                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
983                 }
984             }
985
986             /* no penalty for LFE channel mismatch */
987             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
988                 (out_chlayout & AV_CH_LOW_FREQUENCY))
989                 score += 10;
990             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
991             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
992
993             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
994                                                                  out_chlayout);
995             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
996                                                                  (~in_chlayout));
997             score += 10 * matched_channels - 5 * extra_channels;
998
999             if (score > best_score ||
1000                 (count_diff < best_count_diff && score == best_score)) {
1001                 best_score = score;
1002                 best_idx   = j;
1003                 best_count_diff = count_diff;
1004             }
1005         }
1006         av_assert0(best_idx >= 0);
1007         FFSWAP(uint64_t, outlink->incfg.channel_layouts->channel_layouts[0],
1008                outlink->incfg.channel_layouts->channel_layouts[best_idx]);
1009     }
1010
1011 }
1012
1013 static void swap_channel_layouts(AVFilterGraph *graph)
1014 {
1015     int i;
1016
1017     for (i = 0; i < graph->nb_filters; i++)
1018         swap_channel_layouts_on_filter(graph->filters[i]);
1019 }
1020
1021 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1022 {
1023     AVFilterLink *link = NULL;
1024     int format, bps;
1025     int i, j;
1026
1027     for (i = 0; i < filter->nb_inputs; i++) {
1028         link = filter->inputs[i];
1029
1030         if (link->type == AVMEDIA_TYPE_AUDIO &&
1031             link->outcfg.formats->nb_formats == 1)
1032             break;
1033     }
1034     if (i == filter->nb_inputs)
1035         return;
1036
1037     format = link->outcfg.formats->formats[0];
1038     bps    = av_get_bytes_per_sample(format);
1039
1040     for (i = 0; i < filter->nb_outputs; i++) {
1041         AVFilterLink *outlink = filter->outputs[i];
1042         int best_idx = -1, best_score = INT_MIN;
1043
1044         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1045             outlink->incfg.formats->nb_formats < 2)
1046             continue;
1047
1048         for (j = 0; j < outlink->incfg.formats->nb_formats; j++) {
1049             int out_format = outlink->incfg.formats->formats[j];
1050             int out_bps    = av_get_bytes_per_sample(out_format);
1051             int score;
1052
1053             if (av_get_packed_sample_fmt(out_format) == format ||
1054                 av_get_planar_sample_fmt(out_format) == format) {
1055                 best_idx   = j;
1056                 break;
1057             }
1058
1059             /* for s32 and float prefer double to prevent loss of information */
1060             if (bps == 4 && out_bps == 8) {
1061                 best_idx = j;
1062                 break;
1063             }
1064
1065             /* prefer closest higher or equal bps */
1066             score = -abs(out_bps - bps);
1067             if (out_bps >= bps)
1068                 score += INT_MAX/2;
1069
1070             if (score > best_score) {
1071                 best_score = score;
1072                 best_idx   = j;
1073             }
1074         }
1075         av_assert0(best_idx >= 0);
1076         FFSWAP(int, outlink->incfg.formats->formats[0],
1077                outlink->incfg.formats->formats[best_idx]);
1078     }
1079 }
1080
1081 static void swap_sample_fmts(AVFilterGraph *graph)
1082 {
1083     int i;
1084
1085     for (i = 0; i < graph->nb_filters; i++)
1086         swap_sample_fmts_on_filter(graph->filters[i]);
1087
1088 }
1089
1090 static int pick_formats(AVFilterGraph *graph)
1091 {
1092     int i, j, ret;
1093     int change;
1094
1095     do{
1096         change = 0;
1097         for (i = 0; i < graph->nb_filters; i++) {
1098             AVFilterContext *filter = graph->filters[i];
1099             if (filter->nb_inputs){
1100                 for (j = 0; j < filter->nb_inputs; j++){
1101                     if (filter->inputs[j]->incfg.formats && filter->inputs[j]->incfg.formats->nb_formats == 1) {
1102                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1103                             return ret;
1104                         change = 1;
1105                     }
1106                 }
1107             }
1108             if (filter->nb_outputs){
1109                 for (j = 0; j < filter->nb_outputs; j++){
1110                     if (filter->outputs[j]->incfg.formats && filter->outputs[j]->incfg.formats->nb_formats == 1) {
1111                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1112                             return ret;
1113                         change = 1;
1114                     }
1115                 }
1116             }
1117             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1118                 for (j = 0; j < filter->nb_outputs; j++) {
1119                     if (filter->outputs[j]->format<0) {
1120                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1121                             return ret;
1122                         change = 1;
1123                     }
1124                 }
1125             }
1126         }
1127     }while(change);
1128
1129     for (i = 0; i < graph->nb_filters; i++) {
1130         AVFilterContext *filter = graph->filters[i];
1131
1132         for (j = 0; j < filter->nb_inputs; j++)
1133             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1134                 return ret;
1135         for (j = 0; j < filter->nb_outputs; j++)
1136             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1137                 return ret;
1138     }
1139     return 0;
1140 }
1141
1142 /**
1143  * Configure the formats of all the links in the graph.
1144  */
1145 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1146 {
1147     int ret;
1148
1149     /* find supported formats from sub-filters, and merge along links */
1150     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1151         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1152     if (ret < 0)
1153         return ret;
1154
1155     /* Once everything is merged, it's possible that we'll still have
1156      * multiple valid media format choices. We try to minimize the amount
1157      * of format conversion inside filters */
1158     if ((ret = reduce_formats(graph)) < 0)
1159         return ret;
1160
1161     /* for audio filters, ensure the best format, sample rate and channel layout
1162      * is selected */
1163     swap_sample_fmts(graph);
1164     swap_samplerates(graph);
1165     swap_channel_layouts(graph);
1166
1167     if ((ret = pick_formats(graph)) < 0)
1168         return ret;
1169
1170     return 0;
1171 }
1172
1173 static int graph_config_pointers(AVFilterGraph *graph,
1174                                              AVClass *log_ctx)
1175 {
1176     unsigned i, j;
1177     int sink_links_count = 0, n = 0;
1178     AVFilterContext *f;
1179     AVFilterLink **sinks;
1180
1181     for (i = 0; i < graph->nb_filters; i++) {
1182         f = graph->filters[i];
1183         for (j = 0; j < f->nb_inputs; j++) {
1184             f->inputs[j]->graph     = graph;
1185             f->inputs[j]->age_index = -1;
1186         }
1187         for (j = 0; j < f->nb_outputs; j++) {
1188             f->outputs[j]->graph    = graph;
1189             f->outputs[j]->age_index= -1;
1190         }
1191         if (!f->nb_outputs) {
1192             if (f->nb_inputs > INT_MAX - sink_links_count)
1193                 return AVERROR(EINVAL);
1194             sink_links_count += f->nb_inputs;
1195         }
1196     }
1197     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1198     if (!sinks)
1199         return AVERROR(ENOMEM);
1200     for (i = 0; i < graph->nb_filters; i++) {
1201         f = graph->filters[i];
1202         if (!f->nb_outputs) {
1203             for (j = 0; j < f->nb_inputs; j++) {
1204                 sinks[n] = f->inputs[j];
1205                 f->inputs[j]->age_index = n++;
1206             }
1207         }
1208     }
1209     av_assert0(n == sink_links_count);
1210     graph->sink_links       = sinks;
1211     graph->sink_links_count = sink_links_count;
1212     return 0;
1213 }
1214
1215 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1216 {
1217     int ret;
1218
1219     if ((ret = graph_check_validity(graphctx, log_ctx)))
1220         return ret;
1221     if ((ret = graph_config_formats(graphctx, log_ctx)))
1222         return ret;
1223     if ((ret = graph_config_links(graphctx, log_ctx)))
1224         return ret;
1225     if ((ret = graph_check_links(graphctx, log_ctx)))
1226         return ret;
1227     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1228         return ret;
1229
1230     return 0;
1231 }
1232
1233 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1234 {
1235     int i, r = AVERROR(ENOSYS);
1236
1237     if (!graph)
1238         return r;
1239
1240     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1241         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1242         if (r != AVERROR(ENOSYS))
1243             return r;
1244     }
1245
1246     if (res_len && res)
1247         res[0] = 0;
1248
1249     for (i = 0; i < graph->nb_filters; i++) {
1250         AVFilterContext *filter = graph->filters[i];
1251         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1252             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1253             if (r != AVERROR(ENOSYS)) {
1254                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1255                     return r;
1256             }
1257         }
1258     }
1259
1260     return r;
1261 }
1262
1263 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1264 {
1265     int i;
1266
1267     if(!graph)
1268         return 0;
1269
1270     for (i = 0; i < graph->nb_filters; i++) {
1271         AVFilterContext *filter = graph->filters[i];
1272         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1273             AVFilterCommand **queue = &filter->command_queue, *next;
1274             while (*queue && (*queue)->time <= ts)
1275                 queue = &(*queue)->next;
1276             next = *queue;
1277             *queue = av_mallocz(sizeof(AVFilterCommand));
1278             if (!*queue)
1279                 return AVERROR(ENOMEM);
1280
1281             (*queue)->command = av_strdup(command);
1282             (*queue)->arg     = av_strdup(arg);
1283             (*queue)->time    = ts;
1284             (*queue)->flags   = flags;
1285             (*queue)->next    = next;
1286             if(flags & AVFILTER_CMD_FLAG_ONE)
1287                 return 0;
1288         }
1289     }
1290
1291     return 0;
1292 }
1293
1294 static void heap_bubble_up(AVFilterGraph *graph,
1295                            AVFilterLink *link, int index)
1296 {
1297     AVFilterLink **links = graph->sink_links;
1298
1299     av_assert0(index >= 0);
1300
1301     while (index) {
1302         int parent = (index - 1) >> 1;
1303         if (links[parent]->current_pts_us >= link->current_pts_us)
1304             break;
1305         links[index] = links[parent];
1306         links[index]->age_index = index;
1307         index = parent;
1308     }
1309     links[index] = link;
1310     link->age_index = index;
1311 }
1312
1313 static void heap_bubble_down(AVFilterGraph *graph,
1314                              AVFilterLink *link, int index)
1315 {
1316     AVFilterLink **links = graph->sink_links;
1317
1318     av_assert0(index >= 0);
1319
1320     while (1) {
1321         int child = 2 * index + 1;
1322         if (child >= graph->sink_links_count)
1323             break;
1324         if (child + 1 < graph->sink_links_count &&
1325             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1326             child++;
1327         if (link->current_pts_us < links[child]->current_pts_us)
1328             break;
1329         links[index] = links[child];
1330         links[index]->age_index = index;
1331         index = child;
1332     }
1333     links[index] = link;
1334     link->age_index = index;
1335 }
1336
1337 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1338 {
1339     heap_bubble_up  (graph, link, link->age_index);
1340     heap_bubble_down(graph, link, link->age_index);
1341 }
1342
1343 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1344 {
1345     AVFilterLink *oldest = graph->sink_links[0];
1346     int64_t frame_count;
1347     int r;
1348
1349     while (graph->sink_links_count) {
1350         oldest = graph->sink_links[0];
1351         if (oldest->dst->filter->activate) {
1352             /* For now, buffersink is the only filter implementing activate. */
1353             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1354                                               AV_BUFFERSINK_FLAG_PEEK);
1355             if (r != AVERROR_EOF)
1356                 return r;
1357         } else {
1358             r = ff_request_frame(oldest);
1359         }
1360         if (r != AVERROR_EOF)
1361             break;
1362         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1363                oldest->dst ? oldest->dst->name : "unknown",
1364                oldest->dstpad ? oldest->dstpad->name : "unknown");
1365         /* EOF: remove the link from the heap */
1366         if (oldest->age_index < --graph->sink_links_count)
1367             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1368                              oldest->age_index);
1369         oldest->age_index = -1;
1370     }
1371     if (!graph->sink_links_count)
1372         return AVERROR_EOF;
1373     av_assert1(!oldest->dst->filter->activate);
1374     av_assert1(oldest->age_index >= 0);
1375     frame_count = oldest->frame_count_out;
1376     while (frame_count == oldest->frame_count_out) {
1377         r = ff_filter_graph_run_once(graph);
1378         if (r == AVERROR(EAGAIN) &&
1379             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1380             !oldest->status_in)
1381             ff_request_frame(oldest);
1382         else if (r < 0)
1383             return r;
1384     }
1385     return 0;
1386 }
1387
1388 int ff_filter_graph_run_once(AVFilterGraph *graph)
1389 {
1390     AVFilterContext *filter;
1391     unsigned i;
1392
1393     av_assert0(graph->nb_filters);
1394     filter = graph->filters[0];
1395     for (i = 1; i < graph->nb_filters; i++)
1396         if (graph->filters[i]->ready > filter->ready)
1397             filter = graph->filters[i];
1398     if (!filter->ready)
1399         return AVERROR(EAGAIN);
1400     return ff_filter_activate(filter);
1401 }