8892e9decdcfb76a1edb9380af4adfb3f97c79cd
[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 <ctype.h>
24 #include <string.h>
25
26 #include "libavutil/audioconvert.h"
27 #include "libavutil/avassert.h"
28 #include "libavutil/pixdesc.h"
29 #include "avfilter.h"
30 #include "avfiltergraph.h"
31 #include "formats.h"
32 #include "internal.h"
33
34 #include "libavutil/audioconvert.h"
35 #include "libavutil/log.h"
36
37 static const AVClass filtergraph_class = {
38     .class_name = "AVFilterGraph",
39     .item_name  = av_default_item_name,
40     .version    = LIBAVUTIL_VERSION_INT,
41     .category   = AV_CLASS_CATEGORY_FILTER,
42 };
43
44 AVFilterGraph *avfilter_graph_alloc(void)
45 {
46     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
47     if (!ret)
48         return NULL;
49 #if FF_API_GRAPH_AVCLASS
50     ret->av_class = &filtergraph_class;
51 #endif
52     return ret;
53 }
54
55 void avfilter_graph_free(AVFilterGraph **graph)
56 {
57     if (!*graph)
58         return;
59     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
60         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
61     av_freep(&(*graph)->sink_links);
62     av_freep(&(*graph)->scale_sws_opts);
63     av_freep(&(*graph)->filters);
64     av_freep(graph);
65 }
66
67 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
68 {
69     AVFilterContext **filters = av_realloc(graph->filters,
70                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
71     if (!filters)
72         return AVERROR(ENOMEM);
73
74     graph->filters = filters;
75     graph->filters[graph->filter_count++] = filter;
76
77     return 0;
78 }
79
80 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
81                                  const char *name, const char *args, void *opaque,
82                                  AVFilterGraph *graph_ctx)
83 {
84     int ret;
85
86     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
87         goto fail;
88     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
89         goto fail;
90     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
91         goto fail;
92     return 0;
93
94 fail:
95     if (*filt_ctx)
96         avfilter_free(*filt_ctx);
97     *filt_ctx = NULL;
98     return ret;
99 }
100
101 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
102 {
103     graph->disable_auto_convert = flags;
104 }
105
106 /**
107  * Check for the validity of graph.
108  *
109  * A graph is considered valid if all its input and output pads are
110  * connected.
111  *
112  * @return 0 in case of success, a negative value otherwise
113  */
114 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
115 {
116     AVFilterContext *filt;
117     int i, j;
118
119     for (i = 0; i < graph->filter_count; i++) {
120         filt = graph->filters[i];
121
122         for (j = 0; j < filt->nb_inputs; j++) {
123             if (!filt->inputs[j] || !filt->inputs[j]->src) {
124                 av_log(log_ctx, AV_LOG_ERROR,
125                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
126                        filt->input_pads[j].name, filt->name, filt->filter->name);
127                 return AVERROR(EINVAL);
128             }
129         }
130
131         for (j = 0; j < filt->nb_outputs; j++) {
132             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
133                 av_log(log_ctx, AV_LOG_ERROR,
134                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
135                        filt->output_pads[j].name, filt->name, filt->filter->name);
136                 return AVERROR(EINVAL);
137             }
138         }
139     }
140
141     return 0;
142 }
143
144 /**
145  * Configure all the links of graphctx.
146  *
147  * @return 0 in case of success, a negative value otherwise
148  */
149 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
150 {
151     AVFilterContext *filt;
152     int i, ret;
153
154     for (i=0; i < graph->filter_count; i++) {
155         filt = graph->filters[i];
156
157         if (!filt->nb_outputs) {
158             if ((ret = avfilter_config_links(filt)))
159                 return ret;
160         }
161     }
162
163     return 0;
164 }
165
166 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
167 {
168     int i;
169
170     for (i = 0; i < graph->filter_count; i++)
171         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
172             return graph->filters[i];
173
174     return NULL;
175 }
176
177 static int filter_query_formats(AVFilterContext *ctx)
178 {
179     int ret;
180     AVFilterFormats *formats;
181     AVFilterChannelLayouts *chlayouts;
182     AVFilterFormats *samplerates;
183     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
184                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
185                             AVMEDIA_TYPE_VIDEO;
186
187     if ((ret = ctx->filter->query_formats(ctx)) < 0)
188         return ret;
189
190     formats = ff_all_formats(type);
191     if (!formats)
192         return AVERROR(ENOMEM);
193     ff_set_common_formats(ctx, formats);
194     if (type == AVMEDIA_TYPE_AUDIO) {
195         samplerates = ff_all_samplerates();
196         if (!samplerates)
197             return AVERROR(ENOMEM);
198         ff_set_common_samplerates(ctx, samplerates);
199         chlayouts = ff_all_channel_layouts();
200         if (!chlayouts)
201             return AVERROR(ENOMEM);
202         ff_set_common_channel_layouts(ctx, chlayouts);
203     }
204     return 0;
205 }
206
207 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
208                               const char *filt_name, const char *filt_args)
209 {
210     static int auto_count = 0, ret;
211     char inst_name[32];
212     AVFilterContext *filt_ctx;
213
214     if (graph->disable_auto_convert) {
215         av_log(NULL, AV_LOG_ERROR,
216                "The filters '%s' and '%s' do not have a common format "
217                "and automatic conversion is disabled.\n",
218                link->src->name, link->dst->name);
219         return AVERROR(EINVAL);
220     }
221
222     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
223             filt_name, auto_count++);
224
225     if ((ret = avfilter_graph_create_filter(&filt_ctx,
226                                             avfilter_get_by_name(filt_name),
227                                             inst_name, filt_args, NULL, graph)) < 0)
228         return ret;
229     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
230         return ret;
231
232     filter_query_formats(filt_ctx);
233
234     if ( ((link = filt_ctx-> inputs[0]) &&
235            !ff_merge_formats(link->in_formats, link->out_formats)) ||
236          ((link = filt_ctx->outputs[0]) &&
237            !ff_merge_formats(link->in_formats, link->out_formats))
238        ) {
239         av_log(NULL, AV_LOG_ERROR,
240                "Impossible to convert between the formats supported by the filter "
241                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
242         return AVERROR(EINVAL);
243     }
244
245     if (link->type == AVMEDIA_TYPE_AUDIO &&
246          (((link = filt_ctx-> inputs[0]) &&
247            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
248          ((link = filt_ctx->outputs[0]) &&
249            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
250        ) {
251         av_log(NULL, AV_LOG_ERROR,
252                "Impossible to convert between the channel layouts formats supported by the filter "
253                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
254         return AVERROR(EINVAL);
255     }
256
257     return 0;
258 }
259
260 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
261 {
262     int i, j, ret;
263     char filt_args[128];
264     AVFilterFormats *formats;
265     AVFilterChannelLayouts *chlayouts;
266     AVFilterFormats *samplerates;
267     int scaler_count = 0, resampler_count = 0;
268
269     for (j = 0; j < 2; j++) {
270     /* ask all the sub-filters for their supported media formats */
271     for (i = 0; i < graph->filter_count; i++) {
272         /* Call query_formats on sources first.
273            This is a temporary workaround for amerge,
274            until format renegociation is implemented. */
275         if (!graph->filters[i]->nb_inputs == j)
276             continue;
277         if (graph->filters[i]->filter->query_formats)
278             ret = filter_query_formats(graph->filters[i]);
279         else
280             ret = ff_default_query_formats(graph->filters[i]);
281         if (ret < 0)
282             return ret;
283     }
284     }
285
286     /* go through and merge as many format lists as possible */
287     for (i = 0; i < graph->filter_count; i++) {
288         AVFilterContext *filter = graph->filters[i];
289
290         for (j = 0; j < filter->nb_inputs; j++) {
291             AVFilterLink *link = filter->inputs[j];
292 #if 0
293             if (!link) continue;
294
295             if (!link->in_formats || !link->out_formats)
296                 return AVERROR(EINVAL);
297
298             if (link->type == AVMEDIA_TYPE_VIDEO &&
299                 !ff_merge_formats(link->in_formats, link->out_formats)) {
300
301                 /* couldn't merge format lists, auto-insert scale filter */
302                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
303                          graph->scale_sws_opts);
304                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
305                     return ret;
306             }
307             else if (link->type == AVMEDIA_TYPE_AUDIO) {
308                 if (!link->in_channel_layouts || !link->out_channel_layouts)
309                     return AVERROR(EINVAL);
310
311                 /* Merge all three list before checking: that way, in all
312                  * three categories, aconvert will use a common format
313                  * whenever possible. */
314                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
315                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
316                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
317
318                 if (!formats || !chlayouts || !samplerates)
319                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
320                        return ret;
321 #else
322             int convert_needed = 0;
323
324             if (!link)
325                 continue;
326
327             if (link->in_formats != link->out_formats &&
328                 !ff_merge_formats(link->in_formats,
329                                         link->out_formats))
330                 convert_needed = 1;
331             if (link->type == AVMEDIA_TYPE_AUDIO) {
332                 if (link->in_channel_layouts != link->out_channel_layouts &&
333                     !ff_merge_channel_layouts(link->in_channel_layouts,
334                                               link->out_channel_layouts))
335                     convert_needed = 1;
336                 if (link->in_samplerates != link->out_samplerates &&
337                     !ff_merge_samplerates(link->in_samplerates,
338                                           link->out_samplerates))
339                     convert_needed = 1;
340             }
341
342             if (convert_needed) {
343                 AVFilterContext *convert;
344                 AVFilter *filter;
345                 AVFilterLink *inlink, *outlink;
346                 char scale_args[256];
347                 char inst_name[30];
348
349                 /* couldn't merge format lists. auto-insert conversion filter */
350                 switch (link->type) {
351                 case AVMEDIA_TYPE_VIDEO:
352                     if (!(filter = avfilter_get_by_name("scale"))) {
353                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
354                                "not present, cannot convert pixel formats.\n");
355                         return AVERROR(EINVAL);
356                     }
357
358                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
359                              scaler_count++);
360                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
361                     if ((ret = avfilter_graph_create_filter(&convert, filter,
362                                                             inst_name, scale_args, NULL,
363                                                             graph)) < 0)
364                         return ret;
365                     break;
366                 case AVMEDIA_TYPE_AUDIO:
367                     if (!(filter = avfilter_get_by_name("aresample"))) {
368                         av_log(log_ctx, AV_LOG_ERROR, "'resample' filter "
369                                "not present, cannot convert audio formats.\n");
370                         return AVERROR(EINVAL);
371                     }
372
373                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
374                              resampler_count++);
375                     if ((ret = avfilter_graph_create_filter(&convert, filter,
376                                                             inst_name, NULL, NULL, graph)) < 0)
377                         return ret;
378                     break;
379                 default:
380                     return AVERROR(EINVAL);
381                 }
382
383                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
384                     return ret;
385
386                 filter_query_formats(convert);
387                 inlink  = convert->inputs[0];
388                 outlink = convert->outputs[0];
389                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
390                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
391                     ret |= AVERROR(ENOSYS);
392                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
393                     (!ff_merge_samplerates(inlink->in_samplerates,
394                                            inlink->out_samplerates) ||
395                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
396                                                inlink->out_channel_layouts)))
397                     ret |= AVERROR(ENOSYS);
398                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
399                     (!ff_merge_samplerates(outlink->in_samplerates,
400                                            outlink->out_samplerates) ||
401                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
402                                                outlink->out_channel_layouts)))
403                     ret |= AVERROR(ENOSYS);
404
405                 if (ret < 0) {
406                     av_log(log_ctx, AV_LOG_ERROR,
407                            "Impossible to convert between the formats supported by the filter "
408                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
409                     return ret;
410                 }
411 #endif
412             }
413         }
414     }
415
416     return 0;
417 }
418
419 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
420 {
421     if (!link || !link->in_formats)
422         return 0;
423
424     if (link->type == AVMEDIA_TYPE_VIDEO) {
425         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
426             int has_alpha= av_pix_fmt_descriptors[ref->format].nb_components % 2 == 0;
427             enum PixelFormat best= PIX_FMT_NONE;
428             int i;
429             for (i=0; i<link->in_formats->format_count; i++) {
430                 enum PixelFormat p = link->in_formats->formats[i];
431                 best= avcodec_find_best_pix_fmt2(best, p, ref->format, has_alpha, NULL);
432             }
433             link->in_formats->formats[0] = best;
434         }
435     }
436
437     link->in_formats->format_count = 1;
438     link->format = link->in_formats->formats[0];
439
440     if (link->type == AVMEDIA_TYPE_AUDIO) {
441         if (!link->in_samplerates->format_count) {
442             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
443                    " the link between filters %s and %s.\n", link->src->name,
444                    link->dst->name);
445             return AVERROR(EINVAL);
446         }
447         link->in_samplerates->format_count = 1;
448         link->sample_rate = link->in_samplerates->formats[0];
449
450         if (!link->in_channel_layouts->nb_channel_layouts) {
451             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
452                    "the link between filters %s and %s.\n", link->src->name,
453                    link->dst->name);
454             return AVERROR(EINVAL);
455         }
456         link->in_channel_layouts->nb_channel_layouts = 1;
457         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
458     }
459
460     ff_formats_unref(&link->in_formats);
461     ff_formats_unref(&link->out_formats);
462     ff_formats_unref(&link->in_samplerates);
463     ff_formats_unref(&link->out_samplerates);
464     ff_channel_layouts_unref(&link->in_channel_layouts);
465     ff_channel_layouts_unref(&link->out_channel_layouts);
466
467     return 0;
468 }
469
470 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
471 do {                                                                   \
472     for (i = 0; i < filter->nb_inputs; i++) {                          \
473         AVFilterLink *link = filter->inputs[i];                        \
474         fmt_type fmt;                                                  \
475                                                                        \
476         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
477             continue;                                                  \
478         fmt = link->out_ ## list->var[0];                              \
479                                                                        \
480         for (j = 0; j < filter->nb_outputs; j++) {                     \
481             AVFilterLink *out_link = filter->outputs[j];               \
482             list_type *fmts;                                           \
483                                                                        \
484             if (link->type != out_link->type ||                        \
485                 out_link->in_ ## list->nb == 1)                        \
486                 continue;                                              \
487             fmts = out_link->in_ ## list;                              \
488                                                                        \
489             if (!out_link->in_ ## list->nb) {                          \
490                 add_format(&out_link->in_ ##list, fmt);                \
491                 break;                                                 \
492             }                                                          \
493                                                                        \
494             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
495                 if (fmts->var[k] == fmt) {                             \
496                     fmts->var[0]  = fmt;                               \
497                     fmts->nb = 1;                                      \
498                     ret = 1;                                           \
499                     break;                                             \
500                 }                                                      \
501         }                                                              \
502     }                                                                  \
503 } while (0)
504
505 static int reduce_formats_on_filter(AVFilterContext *filter)
506 {
507     int i, j, k, ret = 0;
508
509     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
510                    format_count, ff_add_format);
511     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
512                    format_count, ff_add_format);
513     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
514                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
515
516     return ret;
517 }
518
519 static void reduce_formats(AVFilterGraph *graph)
520 {
521     int i, reduced;
522
523     do {
524         reduced = 0;
525
526         for (i = 0; i < graph->filter_count; i++)
527             reduced |= reduce_formats_on_filter(graph->filters[i]);
528     } while (reduced);
529 }
530
531 static void swap_samplerates_on_filter(AVFilterContext *filter)
532 {
533     AVFilterLink *link = NULL;
534     int sample_rate;
535     int i, j;
536
537     for (i = 0; i < filter->nb_inputs; i++) {
538         link = filter->inputs[i];
539
540         if (link->type == AVMEDIA_TYPE_AUDIO &&
541             link->out_samplerates->format_count == 1)
542             break;
543     }
544     if (i == filter->nb_inputs)
545         return;
546
547     sample_rate = link->out_samplerates->formats[0];
548
549     for (i = 0; i < filter->nb_outputs; i++) {
550         AVFilterLink *outlink = filter->outputs[i];
551         int best_idx, best_diff = INT_MAX;
552
553         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
554             outlink->in_samplerates->format_count < 2)
555             continue;
556
557         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
558             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
559
560             if (diff < best_diff) {
561                 best_diff = diff;
562                 best_idx  = j;
563             }
564         }
565         FFSWAP(int, outlink->in_samplerates->formats[0],
566                outlink->in_samplerates->formats[best_idx]);
567     }
568 }
569
570 static void swap_samplerates(AVFilterGraph *graph)
571 {
572     int i;
573
574     for (i = 0; i < graph->filter_count; i++)
575         swap_samplerates_on_filter(graph->filters[i]);
576 }
577
578 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
579 {
580     AVFilterLink *link = NULL;
581     uint64_t chlayout;
582     int i, j;
583
584     for (i = 0; i < filter->nb_inputs; i++) {
585         link = filter->inputs[i];
586
587         if (link->type == AVMEDIA_TYPE_AUDIO &&
588             link->out_channel_layouts->nb_channel_layouts == 1)
589             break;
590     }
591     if (i == filter->nb_inputs)
592         return;
593
594     chlayout = link->out_channel_layouts->channel_layouts[0];
595
596     for (i = 0; i < filter->nb_outputs; i++) {
597         AVFilterLink *outlink = filter->outputs[i];
598         int best_idx, best_score = INT_MIN;
599
600         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
601             outlink->in_channel_layouts->nb_channel_layouts < 2)
602             continue;
603
604         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
605             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
606             int matched_channels  = av_get_channel_layout_nb_channels(chlayout &
607                                                                       out_chlayout);
608             int extra_channels     = av_get_channel_layout_nb_channels(out_chlayout &
609                                                                        (~chlayout));
610             int score = matched_channels - extra_channels;
611
612             if (score > best_score) {
613                 best_score = score;
614                 best_idx   = j;
615             }
616         }
617         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
618                outlink->in_channel_layouts->channel_layouts[best_idx]);
619     }
620
621 }
622
623 static void swap_channel_layouts(AVFilterGraph *graph)
624 {
625     int i;
626
627     for (i = 0; i < graph->filter_count; i++)
628         swap_channel_layouts_on_filter(graph->filters[i]);
629 }
630
631 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
632 {
633     AVFilterLink *link = NULL;
634     int format, bps;
635     int i, j;
636
637     for (i = 0; i < filter->nb_inputs; i++) {
638         link = filter->inputs[i];
639
640         if (link->type == AVMEDIA_TYPE_AUDIO &&
641             link->out_formats->format_count == 1)
642             break;
643     }
644     if (i == filter->nb_inputs)
645         return;
646
647     format = link->out_formats->formats[0];
648     bps    = av_get_bytes_per_sample(format);
649
650     for (i = 0; i < filter->nb_outputs; i++) {
651         AVFilterLink *outlink = filter->outputs[i];
652         int best_idx, best_score = INT_MIN;
653
654         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
655             outlink->in_formats->format_count < 2)
656             continue;
657
658         for (j = 0; j < outlink->in_formats->format_count; j++) {
659             int out_format = outlink->in_formats->formats[j];
660             int out_bps    = av_get_bytes_per_sample(out_format);
661             int score;
662
663             if (av_get_packed_sample_fmt(out_format) == format ||
664                 av_get_planar_sample_fmt(out_format) == format) {
665                 best_idx   = j;
666                 break;
667             }
668
669             /* for s32 and float prefer double to prevent loss of information */
670             if (bps == 4 && out_bps == 8) {
671                 best_idx = j;
672                 break;
673             }
674
675             /* prefer closest higher or equal bps */
676             score = -abs(out_bps - bps);
677             if (out_bps >= bps)
678                 score += INT_MAX/2;
679
680             if (score > best_score) {
681                 best_score = score;
682                 best_idx   = j;
683             }
684         }
685         FFSWAP(int, outlink->in_formats->formats[0],
686                outlink->in_formats->formats[best_idx]);
687     }
688 }
689
690 static void swap_sample_fmts(AVFilterGraph *graph)
691 {
692     int i;
693
694     for (i = 0; i < graph->filter_count; i++)
695         swap_sample_fmts_on_filter(graph->filters[i]);
696
697 }
698
699 static int pick_formats(AVFilterGraph *graph)
700 {
701     int i, j, ret;
702     int change;
703
704     do{
705         change = 0;
706         for (i = 0; i < graph->filter_count; i++) {
707             AVFilterContext *filter = graph->filters[i];
708             if (filter->nb_inputs){
709                 for (j = 0; j < filter->nb_inputs; j++){
710                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
711                         pick_format(filter->inputs[j], NULL);
712                         change = 1;
713                     }
714                 }
715             }
716             if (filter->nb_outputs){
717                 for (j = 0; j < filter->nb_outputs; j++){
718                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
719                         pick_format(filter->outputs[j], NULL);
720                         change = 1;
721                     }
722                 }
723             }
724             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
725                 for (j = 0; j < filter->nb_outputs; j++) {
726                     if(filter->outputs[j]->format<0) {
727                         pick_format(filter->outputs[j], filter->inputs[0]);
728                         change = 1;
729                     }
730                 }
731             }
732         }
733     }while(change);
734
735     for (i = 0; i < graph->filter_count; i++) {
736         AVFilterContext *filter = graph->filters[i];
737
738         for (j = 0; j < filter->nb_inputs; j++)
739             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
740                 return ret;
741         for (j = 0; j < filter->nb_outputs; j++)
742             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
743                 return ret;
744     }
745     return 0;
746 }
747
748 /**
749  * Configure the formats of all the links in the graph.
750  */
751 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
752 {
753     int ret;
754
755     /* find supported formats from sub-filters, and merge along links */
756     if ((ret = query_formats(graph, log_ctx)) < 0)
757         return ret;
758
759     /* Once everything is merged, it's possible that we'll still have
760      * multiple valid media format choices. We try to minimize the amount
761      * of format conversion inside filters */
762     reduce_formats(graph);
763
764     /* for audio filters, ensure the best format, sample rate and channel layout
765      * is selected */
766     swap_sample_fmts(graph);
767     swap_samplerates(graph);
768     swap_channel_layouts(graph);
769
770     if ((ret = pick_formats(graph)) < 0)
771         return ret;
772
773     return 0;
774 }
775
776 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
777                                              AVClass *log_ctx)
778 {
779     unsigned i, j;
780     int sink_links_count = 0, n = 0;
781     AVFilterContext *f;
782     AVFilterLink **sinks;
783
784     for (i = 0; i < graph->filter_count; i++) {
785         f = graph->filters[i];
786         for (j = 0; j < f->nb_inputs; j++) {
787             f->inputs[j]->graph     = graph;
788             f->inputs[j]->age_index = -1;
789         }
790         for (j = 0; j < f->nb_outputs; j++) {
791             f->outputs[j]->graph    = graph;
792             f->outputs[j]->age_index= -1;
793         }
794         if (!f->nb_outputs) {
795             if (f->nb_inputs > INT_MAX - sink_links_count)
796                 return AVERROR(EINVAL);
797             sink_links_count += f->nb_inputs;
798         }
799     }
800     sinks = av_calloc(sink_links_count, sizeof(*sinks));
801     if (!sinks)
802         return AVERROR(ENOMEM);
803     for (i = 0; i < graph->filter_count; i++) {
804         f = graph->filters[i];
805         if (!f->nb_outputs) {
806             for (j = 0; j < f->nb_inputs; j++) {
807                 sinks[n] = f->inputs[j];
808                 f->inputs[j]->age_index = n++;
809             }
810         }
811     }
812     av_assert0(n == sink_links_count);
813     graph->sink_links       = sinks;
814     graph->sink_links_count = sink_links_count;
815     return 0;
816 }
817
818 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
819 {
820     AVFilterContext *f;
821     int i, j, ret;
822     int fifo_count = 0;
823
824     for (i = 0; i < graph->filter_count; i++) {
825         f = graph->filters[i];
826
827         for (j = 0; j < f->nb_inputs; j++) {
828             AVFilterLink *link = f->inputs[j];
829             AVFilterContext *fifo_ctx;
830             AVFilter *fifo;
831             char name[32];
832
833             if (!link->dstpad->needs_fifo)
834                 continue;
835
836             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
837                    avfilter_get_by_name("fifo") :
838                    avfilter_get_by_name("afifo");
839
840             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
841
842             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
843                                                NULL, graph);
844             if (ret < 0)
845                 return ret;
846
847             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
848             if (ret < 0)
849                 return ret;
850         }
851     }
852
853     return 0;
854 }
855
856 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
857 {
858     int ret;
859
860     if ((ret = graph_check_validity(graphctx, log_ctx)))
861         return ret;
862     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
863         return ret;
864     if ((ret = graph_config_formats(graphctx, log_ctx)))
865         return ret;
866     if ((ret = graph_config_links(graphctx, log_ctx)))
867         return ret;
868     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
869         return ret;
870
871     return 0;
872 }
873
874 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
875 {
876     int i, r = AVERROR(ENOSYS);
877
878     if(!graph)
879         return r;
880
881     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
882         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
883         if(r != AVERROR(ENOSYS))
884             return r;
885     }
886
887     if(res_len && res)
888         res[0]= 0;
889
890     for (i = 0; i < graph->filter_count; i++) {
891         AVFilterContext *filter = graph->filters[i];
892         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
893             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
894             if(r != AVERROR(ENOSYS)) {
895                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
896                     return r;
897             }
898         }
899     }
900
901     return r;
902 }
903
904 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
905 {
906     int i;
907
908     if(!graph)
909         return 0;
910
911     for (i = 0; i < graph->filter_count; i++) {
912         AVFilterContext *filter = graph->filters[i];
913         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
914             AVFilterCommand **que = &filter->command_queue, *next;
915             while(*que && (*que)->time <= ts)
916                 que = &(*que)->next;
917             next= *que;
918             *que= av_mallocz(sizeof(AVFilterCommand));
919             (*que)->command = av_strdup(command);
920             (*que)->arg     = av_strdup(arg);
921             (*que)->time    = ts;
922             (*que)->flags   = flags;
923             (*que)->next    = next;
924             if(flags & AVFILTER_CMD_FLAG_ONE)
925                 return 0;
926         }
927     }
928
929     return 0;
930 }
931
932 static void heap_bubble_up(AVFilterGraph *graph,
933                            AVFilterLink *link, int index)
934 {
935     AVFilterLink **links = graph->sink_links;
936
937     while (index) {
938         int parent = (index - 1) >> 1;
939         if (links[parent]->current_pts >= link->current_pts)
940             break;
941         links[index] = links[parent];
942         links[index]->age_index = index;
943         index = parent;
944     }
945     links[index] = link;
946     link->age_index = index;
947 }
948
949 static void heap_bubble_down(AVFilterGraph *graph,
950                              AVFilterLink *link, int index)
951 {
952     AVFilterLink **links = graph->sink_links;
953
954     while (1) {
955         int child = 2 * index + 1;
956         if (child >= graph->sink_links_count)
957             break;
958         if (child + 1 < graph->sink_links_count &&
959             links[child + 1]->current_pts < links[child]->current_pts)
960             child++;
961         if (link->current_pts < links[child]->current_pts)
962             break;
963         links[index] = links[child];
964         links[index]->age_index = index;
965         index = child;
966     }
967     links[index] = link;
968     link->age_index = index;
969 }
970
971 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
972 {
973     heap_bubble_up  (graph, link, link->age_index);
974     heap_bubble_down(graph, link, link->age_index);
975 }
976
977
978 int avfilter_graph_request_oldest(AVFilterGraph *graph)
979 {
980     while (graph->sink_links_count) {
981         AVFilterLink *oldest = graph->sink_links[0];
982         int r = ff_request_frame(oldest);
983         if (r != AVERROR_EOF)
984             return r;
985         /* EOF: remove the link from the heap */
986         if (oldest->age_index < --graph->sink_links_count)
987             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
988                              oldest->age_index);
989         oldest->age_index = -1;
990     }
991     return AVERROR_EOF;
992 }