lavfi/avfiltergraph: only return EOF in avfilter_graph_request_oldest if all sinks...
[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 #if FF_API_LAVR_OPTS
132     av_freep(&(*graph)->resample_lavr_opts);
133 #endif
134     av_freep(&(*graph)->filters);
135     av_freep(&(*graph)->internal);
136     av_freep(graph);
137 }
138
139 #if FF_API_AVFILTER_OPEN
140 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
141 {
142     AVFilterContext **filters = av_realloc(graph->filters,
143                                            sizeof(*filters) * (graph->nb_filters + 1));
144     if (!filters)
145         return AVERROR(ENOMEM);
146
147     graph->filters = filters;
148     graph->filters[graph->nb_filters++] = filter;
149
150     filter->graph = graph;
151
152     return 0;
153 }
154 #endif
155
156 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
157                                  const char *name, const char *args, void *opaque,
158                                  AVFilterGraph *graph_ctx)
159 {
160     int ret;
161
162     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
163     if (!*filt_ctx)
164         return AVERROR(ENOMEM);
165
166     ret = avfilter_init_str(*filt_ctx, args);
167     if (ret < 0)
168         goto fail;
169
170     return 0;
171
172 fail:
173     if (*filt_ctx)
174         avfilter_free(*filt_ctx);
175     *filt_ctx = NULL;
176     return ret;
177 }
178
179 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
180 {
181     graph->disable_auto_convert = flags;
182 }
183
184 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
185                                              const AVFilter *filter,
186                                              const char *name)
187 {
188     AVFilterContext **filters, *s;
189
190     if (graph->thread_type && !graph->internal->thread_execute) {
191         if (graph->execute) {
192             graph->internal->thread_execute = graph->execute;
193         } else {
194             int ret = ff_graph_thread_init(graph);
195             if (ret < 0) {
196                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
197                 return NULL;
198             }
199         }
200     }
201
202     s = ff_filter_alloc(filter, name);
203     if (!s)
204         return NULL;
205
206     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
207     if (!filters) {
208         avfilter_free(s);
209         return NULL;
210     }
211
212     graph->filters = filters;
213     graph->filters[graph->nb_filters++] = s;
214
215     s->graph = graph;
216
217     return s;
218 }
219
220 /**
221  * Check for the validity of graph.
222  *
223  * A graph is considered valid if all its input and output pads are
224  * connected.
225  *
226  * @return >= 0 in case of success, a negative value otherwise
227  */
228 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
229 {
230     AVFilterContext *filt;
231     int i, j;
232
233     for (i = 0; i < graph->nb_filters; i++) {
234         const AVFilterPad *pad;
235         filt = graph->filters[i];
236
237         for (j = 0; j < filt->nb_inputs; j++) {
238             if (!filt->inputs[j] || !filt->inputs[j]->src) {
239                 pad = &filt->input_pads[j];
240                 av_log(log_ctx, AV_LOG_ERROR,
241                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
242                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
243                 return AVERROR(EINVAL);
244             }
245         }
246
247         for (j = 0; j < filt->nb_outputs; j++) {
248             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
249                 pad = &filt->output_pads[j];
250                 av_log(log_ctx, AV_LOG_ERROR,
251                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
252                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
253                 return AVERROR(EINVAL);
254             }
255         }
256     }
257
258     return 0;
259 }
260
261 /**
262  * Configure all the links of graphctx.
263  *
264  * @return >= 0 in case of success, a negative value otherwise
265  */
266 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
267 {
268     AVFilterContext *filt;
269     int i, ret;
270
271     for (i = 0; i < graph->nb_filters; i++) {
272         filt = graph->filters[i];
273
274         if (!filt->nb_outputs) {
275             if ((ret = avfilter_config_links(filt)))
276                 return ret;
277         }
278     }
279
280     return 0;
281 }
282
283 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
284 {
285     int i;
286
287     for (i = 0; i < graph->nb_filters; i++)
288         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
289             return graph->filters[i];
290
291     return NULL;
292 }
293
294 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
295 {
296     if (!l)
297         return;
298     if (l->nb_channel_layouts) {
299         if (l->all_layouts || l->all_counts)
300             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
301         l->all_layouts = l->all_counts = 0;
302     } else {
303         if (l->all_counts && !l->all_layouts)
304             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
305         l->all_layouts = 1;
306     }
307 }
308
309 static int filter_query_formats(AVFilterContext *ctx)
310 {
311     int ret, i;
312     AVFilterFormats *formats;
313     AVFilterChannelLayouts *chlayouts;
314     AVFilterFormats *samplerates;
315     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
316                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
317                             AVMEDIA_TYPE_VIDEO;
318
319     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
320         if (ret != AVERROR(EAGAIN))
321             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
322                    ctx->name, av_err2str(ret));
323         return ret;
324     }
325
326     for (i = 0; i < ctx->nb_inputs; i++)
327         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
328     for (i = 0; i < ctx->nb_outputs; i++)
329         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
330
331     formats = ff_all_formats(type);
332     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
333         return ret;
334     if (type == AVMEDIA_TYPE_AUDIO) {
335         samplerates = ff_all_samplerates();
336         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
337             return ret;
338         chlayouts = ff_all_channel_layouts();
339         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
340             return ret;
341     }
342     return 0;
343 }
344
345 static int formats_declared(AVFilterContext *f)
346 {
347     int i;
348
349     for (i = 0; i < f->nb_inputs; i++) {
350         if (!f->inputs[i]->out_formats)
351             return 0;
352         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
353             !(f->inputs[i]->out_samplerates &&
354               f->inputs[i]->out_channel_layouts))
355             return 0;
356     }
357     for (i = 0; i < f->nb_outputs; i++) {
358         if (!f->outputs[i]->in_formats)
359             return 0;
360         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
361             !(f->outputs[i]->in_samplerates &&
362               f->outputs[i]->in_channel_layouts))
363             return 0;
364     }
365     return 1;
366 }
367
368 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
369 {
370     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
371     if (a) {
372         a->refcount = 0;
373         a->refs     = NULL;
374         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
375         if (!a->formats && arg->formats)
376             av_freep(&a);
377     }
378     return a;
379 }
380
381 static int can_merge_formats(AVFilterFormats *a_arg,
382                              AVFilterFormats *b_arg,
383                              enum AVMediaType type,
384                              int is_sample_rate)
385 {
386     AVFilterFormats *a, *b, *ret;
387     if (a_arg == b_arg)
388         return 1;
389     a = clone_filter_formats(a_arg);
390     b = clone_filter_formats(b_arg);
391
392     if (!a || !b) {
393         if (a)
394             av_freep(&a->formats);
395         if (b)
396             av_freep(&b->formats);
397
398         av_freep(&a);
399         av_freep(&b);
400
401         return 0;
402     }
403
404     if (is_sample_rate) {
405         ret = ff_merge_samplerates(a, b);
406     } else {
407         ret = ff_merge_formats(a, b, type);
408     }
409     if (ret) {
410         av_freep(&ret->formats);
411         av_freep(&ret->refs);
412         av_freep(&ret);
413         return 1;
414     } else {
415         av_freep(&a->formats);
416         av_freep(&b->formats);
417         av_freep(&a);
418         av_freep(&b);
419         return 0;
420     }
421 }
422
423 /**
424  * Perform one round of query_formats() and merging formats lists on the
425  * filter graph.
426  * @return  >=0 if all links formats lists could be queried and merged;
427  *          AVERROR(EAGAIN) some progress was made in the queries or merging
428  *          and a later call may succeed;
429  *          AVERROR(EIO) (may be changed) plus a log message if no progress
430  *          was made and the negotiation is stuck;
431  *          a negative error code if some other error happened
432  */
433 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
434 {
435     int i, j, ret;
436     int scaler_count = 0, resampler_count = 0;
437     int count_queried = 0;        /* successful calls to query_formats() */
438     int count_merged = 0;         /* successful merge of formats lists */
439     int count_already_merged = 0; /* lists already merged */
440     int count_delayed = 0;        /* lists that need to be merged later */
441
442     for (i = 0; i < graph->nb_filters; i++) {
443         AVFilterContext *f = graph->filters[i];
444         if (formats_declared(f))
445             continue;
446         if (f->filter->query_formats)
447             ret = filter_query_formats(f);
448         else
449             ret = ff_default_query_formats(f);
450         if (ret < 0 && ret != AVERROR(EAGAIN))
451             return ret;
452         /* note: EAGAIN could indicate a partial success, not counted yet */
453         count_queried += ret >= 0;
454     }
455
456     /* go through and merge as many format lists as possible */
457     for (i = 0; i < graph->nb_filters; i++) {
458         AVFilterContext *filter = graph->filters[i];
459
460         for (j = 0; j < filter->nb_inputs; j++) {
461             AVFilterLink *link = filter->inputs[j];
462             int convert_needed = 0;
463
464             if (!link)
465                 continue;
466
467             if (link->in_formats != link->out_formats
468                 && link->in_formats && link->out_formats)
469                 if (!can_merge_formats(link->in_formats, link->out_formats,
470                                       link->type, 0))
471                     convert_needed = 1;
472             if (link->type == AVMEDIA_TYPE_AUDIO) {
473                 if (link->in_samplerates != link->out_samplerates
474                     && link->in_samplerates && link->out_samplerates)
475                     if (!can_merge_formats(link->in_samplerates,
476                                            link->out_samplerates,
477                                            0, 1))
478                         convert_needed = 1;
479             }
480
481 #define MERGE_DISPATCH(field, statement)                                     \
482             if (!(link->in_ ## field && link->out_ ## field)) {              \
483                 count_delayed++;                                             \
484             } else if (link->in_ ## field == link->out_ ## field) {          \
485                 count_already_merged++;                                      \
486             } else if (!convert_needed) {                                    \
487                 count_merged++;                                              \
488                 statement                                                    \
489             }
490
491             if (link->type == AVMEDIA_TYPE_AUDIO) {
492                 MERGE_DISPATCH(channel_layouts,
493                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
494                                                   link->out_channel_layouts))
495                         convert_needed = 1;
496                 )
497                 MERGE_DISPATCH(samplerates,
498                     if (!ff_merge_samplerates(link->in_samplerates,
499                                               link->out_samplerates))
500                         convert_needed = 1;
501                 )
502             }
503             MERGE_DISPATCH(formats,
504                 if (!ff_merge_formats(link->in_formats, link->out_formats,
505                                       link->type))
506                     convert_needed = 1;
507             )
508 #undef MERGE_DISPATCH
509
510             if (convert_needed) {
511                 AVFilterContext *convert;
512                 AVFilter *filter;
513                 AVFilterLink *inlink, *outlink;
514                 char scale_args[256];
515                 char inst_name[30];
516
517                 if (graph->disable_auto_convert) {
518                     av_log(log_ctx, AV_LOG_ERROR,
519                            "The filters '%s' and '%s' do not have a common format "
520                            "and automatic conversion is disabled.\n",
521                            link->src->name, link->dst->name);
522                     return AVERROR(EINVAL);
523                 }
524
525                 /* couldn't merge format lists. auto-insert conversion filter */
526                 switch (link->type) {
527                 case AVMEDIA_TYPE_VIDEO:
528                     if (!(filter = avfilter_get_by_name("scale"))) {
529                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
530                                "not present, cannot convert pixel formats.\n");
531                         return AVERROR(EINVAL);
532                     }
533
534                     snprintf(inst_name, sizeof(inst_name), "auto_scaler_%d",
535                              scaler_count++);
536
537                     if ((ret = avfilter_graph_create_filter(&convert, filter,
538                                                             inst_name, graph->scale_sws_opts, NULL,
539                                                             graph)) < 0)
540                         return ret;
541                     break;
542                 case AVMEDIA_TYPE_AUDIO:
543                     if (!(filter = avfilter_get_by_name("aresample"))) {
544                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
545                                "not present, cannot convert audio formats.\n");
546                         return AVERROR(EINVAL);
547                     }
548
549                     snprintf(inst_name, sizeof(inst_name), "auto_resampler_%d",
550                              resampler_count++);
551                     scale_args[0] = '\0';
552                     if (graph->aresample_swr_opts)
553                         snprintf(scale_args, sizeof(scale_args), "%s",
554                                  graph->aresample_swr_opts);
555                     if ((ret = avfilter_graph_create_filter(&convert, filter,
556                                                             inst_name, graph->aresample_swr_opts,
557                                                             NULL, graph)) < 0)
558                         return ret;
559                     break;
560                 default:
561                     return AVERROR(EINVAL);
562                 }
563
564                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
565                     return ret;
566
567                 if ((ret = filter_query_formats(convert)) < 0)
568                     return ret;
569
570                 inlink  = convert->inputs[0];
571                 outlink = convert->outputs[0];
572                 av_assert0( inlink-> in_formats->refcount > 0);
573                 av_assert0( inlink->out_formats->refcount > 0);
574                 av_assert0(outlink-> in_formats->refcount > 0);
575                 av_assert0(outlink->out_formats->refcount > 0);
576                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
577                     av_assert0( inlink-> in_samplerates->refcount > 0);
578                     av_assert0( inlink->out_samplerates->refcount > 0);
579                     av_assert0(outlink-> in_samplerates->refcount > 0);
580                     av_assert0(outlink->out_samplerates->refcount > 0);
581                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
582                     av_assert0( inlink->out_channel_layouts->refcount > 0);
583                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
584                     av_assert0(outlink->out_channel_layouts->refcount > 0);
585                 }
586                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
587                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
588                     ret = AVERROR(ENOSYS);
589                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
590                     (!ff_merge_samplerates(inlink->in_samplerates,
591                                            inlink->out_samplerates) ||
592                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
593                                                inlink->out_channel_layouts)))
594                     ret = AVERROR(ENOSYS);
595                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
596                     (!ff_merge_samplerates(outlink->in_samplerates,
597                                            outlink->out_samplerates) ||
598                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
599                                                outlink->out_channel_layouts)))
600                     ret = AVERROR(ENOSYS);
601
602                 if (ret < 0) {
603                     av_log(log_ctx, AV_LOG_ERROR,
604                            "Impossible to convert between the formats supported by the filter "
605                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
606                     return ret;
607                 }
608             }
609         }
610     }
611
612     av_log(graph, AV_LOG_DEBUG, "query_formats: "
613            "%d queried, %d merged, %d already done, %d delayed\n",
614            count_queried, count_merged, count_already_merged, count_delayed);
615     if (count_delayed) {
616         AVBPrint bp;
617
618         /* if count_queried > 0, one filter at least did set its formats,
619            that will give additional information to its neighbour;
620            if count_merged > 0, one pair of formats lists at least was merged,
621            that will give additional information to all connected filters;
622            in both cases, progress was made and a new round must be done */
623         if (count_queried || count_merged)
624             return AVERROR(EAGAIN);
625         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
626         for (i = 0; i < graph->nb_filters; i++)
627             if (!formats_declared(graph->filters[i]))
628                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
629                           graph->filters[i]->name);
630         av_log(graph, AV_LOG_ERROR,
631                "The following filters could not choose their formats: %s\n"
632                "Consider inserting the (a)format filter near their input or "
633                "output.\n", bp.str);
634         return AVERROR(EIO);
635     }
636     return 0;
637 }
638
639 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
640 {
641     int score = 0;
642
643     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
644         score ++;
645
646     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
647         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
648     }else
649         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
650
651     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
652         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
653         score += 20;
654
655     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
656         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
657         score += 2;
658
659     return score;
660 }
661
662 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
663                                                      enum AVSampleFormat src_fmt)
664 {
665     int score1, score2;
666
667     score1 = get_fmt_score(dst_fmt1, src_fmt);
668     score2 = get_fmt_score(dst_fmt2, src_fmt);
669
670     return score1 < score2 ? dst_fmt1 : dst_fmt2;
671 }
672
673 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
674 {
675     if (!link || !link->in_formats)
676         return 0;
677
678     if (link->type == AVMEDIA_TYPE_VIDEO) {
679         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
680             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
681             enum AVPixelFormat best= AV_PIX_FMT_NONE;
682             int i;
683             for (i=0; i<link->in_formats->nb_formats; i++) {
684                 enum AVPixelFormat p = link->in_formats->formats[i];
685                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
686             }
687             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
688                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
689                    av_get_pix_fmt_name(ref->format), has_alpha);
690             link->in_formats->formats[0] = best;
691         }
692     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
693         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
694             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
695             int i;
696             for (i=0; i<link->in_formats->nb_formats; i++) {
697                 enum AVSampleFormat p = link->in_formats->formats[i];
698                 best = find_best_sample_fmt_of_2(best, p, ref->format);
699             }
700             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
701                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
702                    av_get_sample_fmt_name(ref->format));
703             link->in_formats->formats[0] = best;
704         }
705     }
706
707     link->in_formats->nb_formats = 1;
708     link->format = link->in_formats->formats[0];
709
710     if (link->type == AVMEDIA_TYPE_AUDIO) {
711         if (!link->in_samplerates->nb_formats) {
712             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
713                    " the link between filters %s and %s.\n", link->src->name,
714                    link->dst->name);
715             return AVERROR(EINVAL);
716         }
717         link->in_samplerates->nb_formats = 1;
718         link->sample_rate = link->in_samplerates->formats[0];
719
720         if (link->in_channel_layouts->all_layouts) {
721             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
722                    " the link between filters %s and %s.\n", link->src->name,
723                    link->dst->name);
724             if (!link->in_channel_layouts->all_counts)
725                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
726                        "supported, try specifying a channel layout using "
727                        "'aformat=channel_layouts=something'.\n");
728             return AVERROR(EINVAL);
729         }
730         link->in_channel_layouts->nb_channel_layouts = 1;
731         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
732         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
733             link->channel_layout = 0;
734         else
735             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
736     }
737
738     ff_formats_unref(&link->in_formats);
739     ff_formats_unref(&link->out_formats);
740     ff_formats_unref(&link->in_samplerates);
741     ff_formats_unref(&link->out_samplerates);
742     ff_channel_layouts_unref(&link->in_channel_layouts);
743     ff_channel_layouts_unref(&link->out_channel_layouts);
744
745     return 0;
746 }
747
748 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
749 do {                                                                   \
750     for (i = 0; i < filter->nb_inputs; i++) {                          \
751         AVFilterLink *link = filter->inputs[i];                        \
752         fmt_type fmt;                                                  \
753                                                                        \
754         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
755             continue;                                                  \
756         fmt = link->out_ ## list->var[0];                              \
757                                                                        \
758         for (j = 0; j < filter->nb_outputs; j++) {                     \
759             AVFilterLink *out_link = filter->outputs[j];               \
760             list_type *fmts;                                           \
761                                                                        \
762             if (link->type != out_link->type ||                        \
763                 out_link->in_ ## list->nb == 1)                        \
764                 continue;                                              \
765             fmts = out_link->in_ ## list;                              \
766                                                                        \
767             if (!out_link->in_ ## list->nb) {                          \
768                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
769                     return ret;                                        \
770                 ret = 1;                                               \
771                 break;                                                 \
772             }                                                          \
773                                                                        \
774             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
775                 if (fmts->var[k] == fmt) {                             \
776                     fmts->var[0]  = fmt;                               \
777                     fmts->nb = 1;                                      \
778                     ret = 1;                                           \
779                     break;                                             \
780                 }                                                      \
781         }                                                              \
782     }                                                                  \
783 } while (0)
784
785 static int reduce_formats_on_filter(AVFilterContext *filter)
786 {
787     int i, j, k, ret = 0;
788
789     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
790                    nb_formats, ff_add_format, ff_formats_unref);
791     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
792                    nb_formats, ff_add_format, ff_formats_unref);
793
794     /* reduce channel layouts */
795     for (i = 0; i < filter->nb_inputs; i++) {
796         AVFilterLink *inlink = filter->inputs[i];
797         uint64_t fmt;
798
799         if (!inlink->out_channel_layouts ||
800             inlink->out_channel_layouts->nb_channel_layouts != 1)
801             continue;
802         fmt = inlink->out_channel_layouts->channel_layouts[0];
803
804         for (j = 0; j < filter->nb_outputs; j++) {
805             AVFilterLink *outlink = filter->outputs[j];
806             AVFilterChannelLayouts *fmts;
807
808             fmts = outlink->in_channel_layouts;
809             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
810                 continue;
811
812             if (fmts->all_layouts &&
813                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
814                 /* Turn the infinite list into a singleton */
815                 fmts->all_layouts = fmts->all_counts  = 0;
816                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
817                     ret = 1;
818                 break;
819             }
820
821             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
822                 if (fmts->channel_layouts[k] == fmt) {
823                     fmts->channel_layouts[0]  = fmt;
824                     fmts->nb_channel_layouts = 1;
825                     ret = 1;
826                     break;
827                 }
828             }
829         }
830     }
831
832     return ret;
833 }
834
835 static int reduce_formats(AVFilterGraph *graph)
836 {
837     int i, reduced, ret;
838
839     do {
840         reduced = 0;
841
842         for (i = 0; i < graph->nb_filters; i++) {
843             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
844                 return ret;
845             reduced |= ret;
846         }
847     } while (reduced);
848
849     return 0;
850 }
851
852 static void swap_samplerates_on_filter(AVFilterContext *filter)
853 {
854     AVFilterLink *link = NULL;
855     int sample_rate;
856     int i, j;
857
858     for (i = 0; i < filter->nb_inputs; i++) {
859         link = filter->inputs[i];
860
861         if (link->type == AVMEDIA_TYPE_AUDIO &&
862             link->out_samplerates->nb_formats== 1)
863             break;
864     }
865     if (i == filter->nb_inputs)
866         return;
867
868     sample_rate = link->out_samplerates->formats[0];
869
870     for (i = 0; i < filter->nb_outputs; i++) {
871         AVFilterLink *outlink = filter->outputs[i];
872         int best_idx, best_diff = INT_MAX;
873
874         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
875             outlink->in_samplerates->nb_formats < 2)
876             continue;
877
878         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
879             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
880
881             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
882
883             if (diff < best_diff) {
884                 best_diff = diff;
885                 best_idx  = j;
886             }
887         }
888         FFSWAP(int, outlink->in_samplerates->formats[0],
889                outlink->in_samplerates->formats[best_idx]);
890     }
891 }
892
893 static void swap_samplerates(AVFilterGraph *graph)
894 {
895     int i;
896
897     for (i = 0; i < graph->nb_filters; i++)
898         swap_samplerates_on_filter(graph->filters[i]);
899 }
900
901 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
902 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
903 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
904 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
905 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
906 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
907 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
908
909 /* allowable substitutions for channel pairs when comparing layouts,
910  * ordered by priority for both values */
911 static const uint64_t ch_subst[][2] = {
912     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
913     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
914     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
915     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
916     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
917     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
918     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
919     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
920     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
921     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
922     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
923     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
924     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
925     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
926     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
927     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
928     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
929     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
930     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
931     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
932     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
933 };
934
935 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
936 {
937     AVFilterLink *link = NULL;
938     int i, j, k;
939
940     for (i = 0; i < filter->nb_inputs; i++) {
941         link = filter->inputs[i];
942
943         if (link->type == AVMEDIA_TYPE_AUDIO &&
944             link->out_channel_layouts->nb_channel_layouts == 1)
945             break;
946     }
947     if (i == filter->nb_inputs)
948         return;
949
950     for (i = 0; i < filter->nb_outputs; i++) {
951         AVFilterLink *outlink = filter->outputs[i];
952         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
953
954         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
955             outlink->in_channel_layouts->nb_channel_layouts < 2)
956             continue;
957
958         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
959             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
960             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
961             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
962             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
963             int count_diff        = out_channels - in_channels;
964             int matched_channels, extra_channels;
965             int score = 100000;
966
967             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
968                 /* Compute score in case the input or output layout encodes
969                    a channel count; in this case the score is not altered by
970                    the computation afterwards, as in_chlayout and
971                    out_chlayout have both been set to 0 */
972                 if (FF_LAYOUT2COUNT(in_chlayout))
973                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
974                 if (FF_LAYOUT2COUNT(out_chlayout))
975                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
976                 score -= 10000 + FFABS(out_channels - in_channels) +
977                          (in_channels > out_channels ? 10000 : 0);
978                 in_chlayout = out_chlayout = 0;
979                 /* Let the remaining computation run, even if the score
980                    value is not altered */
981             }
982
983             /* channel substitution */
984             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
985                 uint64_t cmp0 = ch_subst[k][0];
986                 uint64_t cmp1 = ch_subst[k][1];
987                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
988                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
989                     in_chlayout  &= ~cmp0;
990                     out_chlayout &= ~cmp1;
991                     /* add score for channel match, minus a deduction for
992                        having to do the substitution */
993                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
994                 }
995             }
996
997             /* no penalty for LFE channel mismatch */
998             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
999                 (out_chlayout & AV_CH_LOW_FREQUENCY))
1000                 score += 10;
1001             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
1002             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
1003
1004             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
1005                                                                  out_chlayout);
1006             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
1007                                                                  (~in_chlayout));
1008             score += 10 * matched_channels - 5 * extra_channels;
1009
1010             if (score > best_score ||
1011                 (count_diff < best_count_diff && score == best_score)) {
1012                 best_score = score;
1013                 best_idx   = j;
1014                 best_count_diff = count_diff;
1015             }
1016         }
1017         av_assert0(best_idx >= 0);
1018         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1019                outlink->in_channel_layouts->channel_layouts[best_idx]);
1020     }
1021
1022 }
1023
1024 static void swap_channel_layouts(AVFilterGraph *graph)
1025 {
1026     int i;
1027
1028     for (i = 0; i < graph->nb_filters; i++)
1029         swap_channel_layouts_on_filter(graph->filters[i]);
1030 }
1031
1032 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1033 {
1034     AVFilterLink *link = NULL;
1035     int format, bps;
1036     int i, j;
1037
1038     for (i = 0; i < filter->nb_inputs; i++) {
1039         link = filter->inputs[i];
1040
1041         if (link->type == AVMEDIA_TYPE_AUDIO &&
1042             link->out_formats->nb_formats == 1)
1043             break;
1044     }
1045     if (i == filter->nb_inputs)
1046         return;
1047
1048     format = link->out_formats->formats[0];
1049     bps    = av_get_bytes_per_sample(format);
1050
1051     for (i = 0; i < filter->nb_outputs; i++) {
1052         AVFilterLink *outlink = filter->outputs[i];
1053         int best_idx = -1, best_score = INT_MIN;
1054
1055         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1056             outlink->in_formats->nb_formats < 2)
1057             continue;
1058
1059         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1060             int out_format = outlink->in_formats->formats[j];
1061             int out_bps    = av_get_bytes_per_sample(out_format);
1062             int score;
1063
1064             if (av_get_packed_sample_fmt(out_format) == format ||
1065                 av_get_planar_sample_fmt(out_format) == format) {
1066                 best_idx   = j;
1067                 break;
1068             }
1069
1070             /* for s32 and float prefer double to prevent loss of information */
1071             if (bps == 4 && out_bps == 8) {
1072                 best_idx = j;
1073                 break;
1074             }
1075
1076             /* prefer closest higher or equal bps */
1077             score = -abs(out_bps - bps);
1078             if (out_bps >= bps)
1079                 score += INT_MAX/2;
1080
1081             if (score > best_score) {
1082                 best_score = score;
1083                 best_idx   = j;
1084             }
1085         }
1086         av_assert0(best_idx >= 0);
1087         FFSWAP(int, outlink->in_formats->formats[0],
1088                outlink->in_formats->formats[best_idx]);
1089     }
1090 }
1091
1092 static void swap_sample_fmts(AVFilterGraph *graph)
1093 {
1094     int i;
1095
1096     for (i = 0; i < graph->nb_filters; i++)
1097         swap_sample_fmts_on_filter(graph->filters[i]);
1098
1099 }
1100
1101 static int pick_formats(AVFilterGraph *graph)
1102 {
1103     int i, j, ret;
1104     int change;
1105
1106     do{
1107         change = 0;
1108         for (i = 0; i < graph->nb_filters; i++) {
1109             AVFilterContext *filter = graph->filters[i];
1110             if (filter->nb_inputs){
1111                 for (j = 0; j < filter->nb_inputs; j++){
1112                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1113                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1114                             return ret;
1115                         change = 1;
1116                     }
1117                 }
1118             }
1119             if (filter->nb_outputs){
1120                 for (j = 0; j < filter->nb_outputs; j++){
1121                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1122                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1123                             return ret;
1124                         change = 1;
1125                     }
1126                 }
1127             }
1128             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1129                 for (j = 0; j < filter->nb_outputs; j++) {
1130                     if(filter->outputs[j]->format<0) {
1131                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1132                             return ret;
1133                         change = 1;
1134                     }
1135                 }
1136             }
1137         }
1138     }while(change);
1139
1140     for (i = 0; i < graph->nb_filters; i++) {
1141         AVFilterContext *filter = graph->filters[i];
1142
1143         for (j = 0; j < filter->nb_inputs; j++)
1144             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1145                 return ret;
1146         for (j = 0; j < filter->nb_outputs; j++)
1147             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1148                 return ret;
1149     }
1150     return 0;
1151 }
1152
1153 /**
1154  * Configure the formats of all the links in the graph.
1155  */
1156 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1157 {
1158     int ret;
1159
1160     /* find supported formats from sub-filters, and merge along links */
1161     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1162         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1163     if (ret < 0)
1164         return ret;
1165
1166     /* Once everything is merged, it's possible that we'll still have
1167      * multiple valid media format choices. We try to minimize the amount
1168      * of format conversion inside filters */
1169     if ((ret = reduce_formats(graph)) < 0)
1170         return ret;
1171
1172     /* for audio filters, ensure the best format, sample rate and channel layout
1173      * is selected */
1174     swap_sample_fmts(graph);
1175     swap_samplerates(graph);
1176     swap_channel_layouts(graph);
1177
1178     if ((ret = pick_formats(graph)) < 0)
1179         return ret;
1180
1181     return 0;
1182 }
1183
1184 static int graph_config_pointers(AVFilterGraph *graph,
1185                                              AVClass *log_ctx)
1186 {
1187     unsigned i, j;
1188     int sink_links_count = 0, n = 0;
1189     AVFilterContext *f;
1190     AVFilterLink **sinks;
1191
1192     for (i = 0; i < graph->nb_filters; i++) {
1193         f = graph->filters[i];
1194         for (j = 0; j < f->nb_inputs; j++) {
1195             f->inputs[j]->graph     = graph;
1196             f->inputs[j]->age_index = -1;
1197         }
1198         for (j = 0; j < f->nb_outputs; j++) {
1199             f->outputs[j]->graph    = graph;
1200             f->outputs[j]->age_index= -1;
1201         }
1202         if (!f->nb_outputs) {
1203             if (f->nb_inputs > INT_MAX - sink_links_count)
1204                 return AVERROR(EINVAL);
1205             sink_links_count += f->nb_inputs;
1206         }
1207     }
1208     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1209     if (!sinks)
1210         return AVERROR(ENOMEM);
1211     for (i = 0; i < graph->nb_filters; i++) {
1212         f = graph->filters[i];
1213         if (!f->nb_outputs) {
1214             for (j = 0; j < f->nb_inputs; j++) {
1215                 sinks[n] = f->inputs[j];
1216                 f->inputs[j]->age_index = n++;
1217             }
1218         }
1219     }
1220     av_assert0(n == sink_links_count);
1221     graph->sink_links       = sinks;
1222     graph->sink_links_count = sink_links_count;
1223     return 0;
1224 }
1225
1226 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1227 {
1228     AVFilterContext *f;
1229     int i, j, ret;
1230     int fifo_count = 0;
1231
1232     for (i = 0; i < graph->nb_filters; i++) {
1233         f = graph->filters[i];
1234
1235         for (j = 0; j < f->nb_inputs; j++) {
1236             AVFilterLink *link = f->inputs[j];
1237             AVFilterContext *fifo_ctx;
1238             AVFilter *fifo;
1239             char name[32];
1240
1241             if (!link->dstpad->needs_fifo)
1242                 continue;
1243
1244             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1245                    avfilter_get_by_name("fifo") :
1246                    avfilter_get_by_name("afifo");
1247
1248             snprintf(name, sizeof(name), "auto_fifo_%d", fifo_count++);
1249
1250             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1251                                                NULL, graph);
1252             if (ret < 0)
1253                 return ret;
1254
1255             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1256             if (ret < 0)
1257                 return ret;
1258         }
1259     }
1260
1261     return 0;
1262 }
1263
1264 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1265 {
1266     int ret;
1267
1268     if ((ret = graph_check_validity(graphctx, log_ctx)))
1269         return ret;
1270     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1271         return ret;
1272     if ((ret = graph_config_formats(graphctx, log_ctx)))
1273         return ret;
1274     if ((ret = graph_config_links(graphctx, log_ctx)))
1275         return ret;
1276     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1277         return ret;
1278
1279     return 0;
1280 }
1281
1282 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1283 {
1284     int i, r = AVERROR(ENOSYS);
1285
1286     if (!graph)
1287         return r;
1288
1289     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1290         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1291         if (r != AVERROR(ENOSYS))
1292             return r;
1293     }
1294
1295     if (res_len && res)
1296         res[0] = 0;
1297
1298     for (i = 0; i < graph->nb_filters; i++) {
1299         AVFilterContext *filter = graph->filters[i];
1300         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1301             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1302             if (r != AVERROR(ENOSYS)) {
1303                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1304                     return r;
1305             }
1306         }
1307     }
1308
1309     return r;
1310 }
1311
1312 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1313 {
1314     int i;
1315
1316     if(!graph)
1317         return 0;
1318
1319     for (i = 0; i < graph->nb_filters; i++) {
1320         AVFilterContext *filter = graph->filters[i];
1321         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1322             AVFilterCommand **queue = &filter->command_queue, *next;
1323             while (*queue && (*queue)->time <= ts)
1324                 queue = &(*queue)->next;
1325             next = *queue;
1326             *queue = av_mallocz(sizeof(AVFilterCommand));
1327             if (!*queue)
1328                 return AVERROR(ENOMEM);
1329
1330             (*queue)->command = av_strdup(command);
1331             (*queue)->arg     = av_strdup(arg);
1332             (*queue)->time    = ts;
1333             (*queue)->flags   = flags;
1334             (*queue)->next    = next;
1335             if(flags & AVFILTER_CMD_FLAG_ONE)
1336                 return 0;
1337         }
1338     }
1339
1340     return 0;
1341 }
1342
1343 static void heap_bubble_up(AVFilterGraph *graph,
1344                            AVFilterLink *link, int index)
1345 {
1346     AVFilterLink **links = graph->sink_links;
1347
1348     av_assert0(index >= 0);
1349
1350     while (index) {
1351         int parent = (index - 1) >> 1;
1352         if (links[parent]->current_pts_us >= link->current_pts_us)
1353             break;
1354         links[index] = links[parent];
1355         links[index]->age_index = index;
1356         index = parent;
1357     }
1358     links[index] = link;
1359     link->age_index = index;
1360 }
1361
1362 static void heap_bubble_down(AVFilterGraph *graph,
1363                              AVFilterLink *link, int index)
1364 {
1365     AVFilterLink **links = graph->sink_links;
1366
1367     av_assert0(index >= 0);
1368
1369     while (1) {
1370         int child = 2 * index + 1;
1371         if (child >= graph->sink_links_count)
1372             break;
1373         if (child + 1 < graph->sink_links_count &&
1374             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1375             child++;
1376         if (link->current_pts_us < links[child]->current_pts_us)
1377             break;
1378         links[index] = links[child];
1379         links[index]->age_index = index;
1380         index = child;
1381     }
1382     links[index] = link;
1383     link->age_index = index;
1384 }
1385
1386 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1387 {
1388     heap_bubble_up  (graph, link, link->age_index);
1389     heap_bubble_down(graph, link, link->age_index);
1390 }
1391
1392 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1393 {
1394     AVFilterLink *oldest = graph->sink_links[0];
1395     int64_t frame_count;
1396     int r;
1397
1398     while (graph->sink_links_count) {
1399         oldest = graph->sink_links[0];
1400         if (oldest->dst->filter->activate) {
1401             /* For now, buffersink is the only filter implementing activate. */
1402             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1403                                               AV_BUFFERSINK_FLAG_PEEK);
1404             if (r != AVERROR_EOF)
1405                 return r;
1406         } else {
1407             r = ff_request_frame(oldest);
1408         }
1409         if (r != AVERROR_EOF)
1410             break;
1411         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1412                oldest->dst ? oldest->dst->name : "unknown",
1413                oldest->dstpad ? oldest->dstpad->name : "unknown");
1414         /* EOF: remove the link from the heap */
1415         if (oldest->age_index < --graph->sink_links_count)
1416             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1417                              oldest->age_index);
1418         oldest->age_index = -1;
1419     }
1420     if (!graph->sink_links_count)
1421         return AVERROR_EOF;
1422     av_assert1(!oldest->dst->filter->activate);
1423     av_assert1(oldest->age_index >= 0);
1424     frame_count = oldest->frame_count_out;
1425     while (frame_count == oldest->frame_count_out) {
1426         r = ff_filter_graph_run_once(graph);
1427         if (r == AVERROR(EAGAIN) &&
1428             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1429             !oldest->status_in)
1430             ff_request_frame(oldest);
1431         else if (r < 0)
1432             return r;
1433     }
1434     return 0;
1435 }
1436
1437 int ff_filter_graph_run_once(AVFilterGraph *graph)
1438 {
1439     AVFilterContext *filter;
1440     unsigned i;
1441
1442     av_assert0(graph->nb_filters);
1443     filter = graph->filters[0];
1444     for (i = 1; i < graph->nb_filters; i++)
1445         if (graph->filters[i]->ready > filter->ready)
1446             filter = graph->filters[i];
1447     if (!filter->ready)
1448         return AVERROR(EAGAIN);
1449     return ff_filter_activate(filter);
1450 }