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