Replace usage of the deprecated av_pix_fmt_descriptors array with av_pix_fmt_desc_get
[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 "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
30 #include "avfilter.h"
31 #include "avfiltergraph.h"
32 #include "formats.h"
33 #include "internal.h"
34
35 #include "libavutil/audioconvert.h"
36 #include "libavutil/avassert.h"
37 #include "libavutil/common.h"
38 #include "libavutil/log.h"
39
40 static const AVClass filtergraph_class = {
41     .class_name = "AVFilterGraph",
42     .item_name  = av_default_item_name,
43     .version    = LIBAVUTIL_VERSION_INT,
44     .category   = AV_CLASS_CATEGORY_FILTER,
45 };
46
47 AVFilterGraph *avfilter_graph_alloc(void)
48 {
49     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
50     if (!ret)
51         return NULL;
52     ret->av_class = &filtergraph_class;
53     return ret;
54 }
55
56 void avfilter_graph_free(AVFilterGraph **graph)
57 {
58     if (!*graph)
59         return;
60     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
61         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
62     av_freep(&(*graph)->sink_links);
63     av_freep(&(*graph)->scale_sws_opts);
64     av_freep(&(*graph)->filters);
65     av_freep(graph);
66 }
67
68 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
69 {
70     AVFilterContext **filters = av_realloc(graph->filters,
71                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
72     if (!filters)
73         return AVERROR(ENOMEM);
74
75     graph->filters = filters;
76     graph->filters[graph->filter_count++] = filter;
77
78     return 0;
79 }
80
81 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
82                                  const char *name, const char *args, void *opaque,
83                                  AVFilterGraph *graph_ctx)
84 {
85     int ret;
86
87     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
88         goto fail;
89     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
90         goto fail;
91     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
92         goto fail;
93     return 0;
94
95 fail:
96     if (*filt_ctx)
97         avfilter_free(*filt_ctx);
98     *filt_ctx = NULL;
99     return ret;
100 }
101
102 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
103 {
104     graph->disable_auto_convert = flags;
105 }
106
107 /**
108  * Check for the validity of graph.
109  *
110  * A graph is considered valid if all its input and output pads are
111  * connected.
112  *
113  * @return 0 in case of success, a negative value otherwise
114  */
115 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
116 {
117     AVFilterContext *filt;
118     int i, j;
119
120     for (i = 0; i < graph->filter_count; i++) {
121         filt = graph->filters[i];
122
123         for (j = 0; j < filt->nb_inputs; j++) {
124             if (!filt->inputs[j] || !filt->inputs[j]->src) {
125                 av_log(log_ctx, AV_LOG_ERROR,
126                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
127                        filt->input_pads[j].name, filt->name, filt->filter->name);
128                 return AVERROR(EINVAL);
129             }
130         }
131
132         for (j = 0; j < filt->nb_outputs; j++) {
133             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
134                 av_log(log_ctx, AV_LOG_ERROR,
135                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
136                        filt->output_pads[j].name, filt->name, filt->filter->name);
137                 return AVERROR(EINVAL);
138             }
139         }
140     }
141
142     return 0;
143 }
144
145 /**
146  * Configure all the links of graphctx.
147  *
148  * @return 0 in case of success, a negative value otherwise
149  */
150 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
151 {
152     AVFilterContext *filt;
153     int i, ret;
154
155     for (i=0; i < graph->filter_count; i++) {
156         filt = graph->filters[i];
157
158         if (!filt->nb_outputs) {
159             if ((ret = avfilter_config_links(filt)))
160                 return ret;
161         }
162     }
163
164     return 0;
165 }
166
167 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
168 {
169     int i;
170
171     for (i = 0; i < graph->filter_count; i++)
172         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
173             return graph->filters[i];
174
175     return NULL;
176 }
177
178 static int filter_query_formats(AVFilterContext *ctx)
179 {
180     int ret;
181     AVFilterFormats *formats;
182     AVFilterChannelLayouts *chlayouts;
183     AVFilterFormats *samplerates;
184     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
185                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
186                             AVMEDIA_TYPE_VIDEO;
187
188     if ((ret = ctx->filter->query_formats(ctx)) < 0)
189         return ret;
190
191     formats = ff_all_formats(type);
192     if (!formats)
193         return AVERROR(ENOMEM);
194     ff_set_common_formats(ctx, formats);
195     if (type == AVMEDIA_TYPE_AUDIO) {
196         samplerates = ff_all_samplerates();
197         if (!samplerates)
198             return AVERROR(ENOMEM);
199         ff_set_common_samplerates(ctx, samplerates);
200         chlayouts = ff_all_channel_layouts();
201         if (!chlayouts)
202             return AVERROR(ENOMEM);
203         ff_set_common_channel_layouts(ctx, chlayouts);
204     }
205     return 0;
206 }
207
208 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
209                               const char *filt_name, const char *filt_args)
210 {
211     static int auto_count = 0, ret;
212     char inst_name[32];
213     AVFilterContext *filt_ctx;
214
215     if (graph->disable_auto_convert) {
216         av_log(NULL, AV_LOG_ERROR,
217                "The filters '%s' and '%s' do not have a common format "
218                "and automatic conversion is disabled.\n",
219                link->src->name, link->dst->name);
220         return AVERROR(EINVAL);
221     }
222
223     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
224             filt_name, auto_count++);
225
226     if ((ret = avfilter_graph_create_filter(&filt_ctx,
227                                             avfilter_get_by_name(filt_name),
228                                             inst_name, filt_args, NULL, graph)) < 0)
229         return ret;
230     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
231         return ret;
232
233     filter_query_formats(filt_ctx);
234
235     if ( ((link = filt_ctx-> inputs[0]) &&
236            !ff_merge_formats(link->in_formats, link->out_formats)) ||
237          ((link = filt_ctx->outputs[0]) &&
238            !ff_merge_formats(link->in_formats, link->out_formats))
239        ) {
240         av_log(NULL, AV_LOG_ERROR,
241                "Impossible to convert between the formats supported by the filter "
242                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
243         return AVERROR(EINVAL);
244     }
245
246     if (link->type == AVMEDIA_TYPE_AUDIO &&
247          (((link = filt_ctx-> inputs[0]) &&
248            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
249          ((link = filt_ctx->outputs[0]) &&
250            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
251        ) {
252         av_log(NULL, AV_LOG_ERROR,
253                "Impossible to convert between the channel layouts formats supported by the filter "
254                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
255         return AVERROR(EINVAL);
256     }
257
258     return 0;
259 }
260
261 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
262 {
263     int i, j, ret;
264     char filt_args[128];
265     AVFilterFormats *formats;
266     AVFilterChannelLayouts *chlayouts;
267     AVFilterFormats *samplerates;
268     int scaler_count = 0, resampler_count = 0;
269
270     for (j = 0; j < 2; j++) {
271     /* ask all the sub-filters for their supported media formats */
272     for (i = 0; i < graph->filter_count; i++) {
273         /* Call query_formats on sources first.
274            This is a temporary workaround for amerge,
275            until format renegociation is implemented. */
276         if (!graph->filters[i]->nb_inputs == j)
277             continue;
278         if (graph->filters[i]->filter->query_formats)
279             ret = filter_query_formats(graph->filters[i]);
280         else
281             ret = ff_default_query_formats(graph->filters[i]);
282         if (ret < 0)
283             return ret;
284     }
285     }
286
287     /* go through and merge as many format lists as possible */
288     for (i = 0; i < graph->filter_count; i++) {
289         AVFilterContext *filter = graph->filters[i];
290
291         for (j = 0; j < filter->nb_inputs; j++) {
292             AVFilterLink *link = filter->inputs[j];
293 #if 0
294             if (!link) continue;
295
296             if (!link->in_formats || !link->out_formats)
297                 return AVERROR(EINVAL);
298
299             if (link->type == AVMEDIA_TYPE_VIDEO &&
300                 !ff_merge_formats(link->in_formats, link->out_formats)) {
301
302                 /* couldn't merge format lists, auto-insert scale filter */
303                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
304                          graph->scale_sws_opts);
305                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
306                     return ret;
307             }
308             else if (link->type == AVMEDIA_TYPE_AUDIO) {
309                 if (!link->in_channel_layouts || !link->out_channel_layouts)
310                     return AVERROR(EINVAL);
311
312                 /* Merge all three list before checking: that way, in all
313                  * three categories, aconvert will use a common format
314                  * whenever possible. */
315                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
316                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
317                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
318
319                 if (!formats || !chlayouts || !samplerates)
320                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
321                        return ret;
322 #else
323             int convert_needed = 0;
324
325             if (!link)
326                 continue;
327
328             if (link->in_formats != link->out_formats &&
329                 !ff_merge_formats(link->in_formats,
330                                         link->out_formats))
331                 convert_needed = 1;
332             if (link->type == AVMEDIA_TYPE_AUDIO) {
333                 if (link->in_channel_layouts != link->out_channel_layouts &&
334                     !ff_merge_channel_layouts(link->in_channel_layouts,
335                                               link->out_channel_layouts))
336                     convert_needed = 1;
337                 if (link->in_samplerates != link->out_samplerates &&
338                     !ff_merge_samplerates(link->in_samplerates,
339                                           link->out_samplerates))
340                     convert_needed = 1;
341             }
342
343             if (convert_needed) {
344                 AVFilterContext *convert;
345                 AVFilter *filter;
346                 AVFilterLink *inlink, *outlink;
347                 char scale_args[256];
348                 char inst_name[30];
349
350                 /* couldn't merge format lists. auto-insert conversion filter */
351                 switch (link->type) {
352                 case AVMEDIA_TYPE_VIDEO:
353                     if (!(filter = avfilter_get_by_name("scale"))) {
354                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
355                                "not present, cannot convert pixel formats.\n");
356                         return AVERROR(EINVAL);
357                     }
358
359                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
360                              scaler_count++);
361                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
362                     if ((ret = avfilter_graph_create_filter(&convert, filter,
363                                                             inst_name, scale_args, NULL,
364                                                             graph)) < 0)
365                         return ret;
366                     break;
367                 case AVMEDIA_TYPE_AUDIO:
368                     if (!(filter = avfilter_get_by_name("aresample"))) {
369                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
370                                "not present, cannot convert audio formats.\n");
371                         return AVERROR(EINVAL);
372                     }
373
374                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
375                              resampler_count++);
376                     if ((ret = avfilter_graph_create_filter(&convert, filter,
377                                                             inst_name, NULL, NULL, graph)) < 0)
378                         return ret;
379                     break;
380                 default:
381                     return AVERROR(EINVAL);
382                 }
383
384                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
385                     return ret;
386
387                 filter_query_formats(convert);
388                 inlink  = convert->inputs[0];
389                 outlink = convert->outputs[0];
390                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
391                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
392                     ret |= AVERROR(ENOSYS);
393                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
394                     (!ff_merge_samplerates(inlink->in_samplerates,
395                                            inlink->out_samplerates) ||
396                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
397                                                inlink->out_channel_layouts)))
398                     ret |= AVERROR(ENOSYS);
399                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
400                     (!ff_merge_samplerates(outlink->in_samplerates,
401                                            outlink->out_samplerates) ||
402                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
403                                                outlink->out_channel_layouts)))
404                     ret |= AVERROR(ENOSYS);
405
406                 if (ret < 0) {
407                     av_log(log_ctx, AV_LOG_ERROR,
408                            "Impossible to convert between the formats supported by the filter "
409                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
410                     return ret;
411                 }
412 #endif
413             }
414         }
415     }
416
417     return 0;
418 }
419
420 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
421 {
422     if (!link || !link->in_formats)
423         return 0;
424
425     if (link->type == AVMEDIA_TYPE_VIDEO) {
426         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
427             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
428             enum AVPixelFormat best= AV_PIX_FMT_NONE;
429             int i;
430             for (i=0; i<link->in_formats->format_count; i++) {
431                 enum AVPixelFormat p = link->in_formats->formats[i];
432                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
433             }
434             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
435                    av_get_pix_fmt_name(best), link->in_formats->format_count,
436                    av_get_pix_fmt_name(ref->format), has_alpha);
437             link->in_formats->formats[0] = best;
438         }
439     }
440
441     link->in_formats->format_count = 1;
442     link->format = link->in_formats->formats[0];
443
444     if (link->type == AVMEDIA_TYPE_AUDIO) {
445         if (!link->in_samplerates->format_count) {
446             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
447                    " the link between filters %s and %s.\n", link->src->name,
448                    link->dst->name);
449             return AVERROR(EINVAL);
450         }
451         link->in_samplerates->format_count = 1;
452         link->sample_rate = link->in_samplerates->formats[0];
453
454         if (!link->in_channel_layouts->nb_channel_layouts) {
455             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
456                    "the link between filters %s and %s.\n", link->src->name,
457                    link->dst->name);
458             return AVERROR(EINVAL);
459         }
460         link->in_channel_layouts->nb_channel_layouts = 1;
461         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
462     }
463
464     ff_formats_unref(&link->in_formats);
465     ff_formats_unref(&link->out_formats);
466     ff_formats_unref(&link->in_samplerates);
467     ff_formats_unref(&link->out_samplerates);
468     ff_channel_layouts_unref(&link->in_channel_layouts);
469     ff_channel_layouts_unref(&link->out_channel_layouts);
470
471     return 0;
472 }
473
474 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
475 do {                                                                   \
476     for (i = 0; i < filter->nb_inputs; i++) {                          \
477         AVFilterLink *link = filter->inputs[i];                        \
478         fmt_type fmt;                                                  \
479                                                                        \
480         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
481             continue;                                                  \
482         fmt = link->out_ ## list->var[0];                              \
483                                                                        \
484         for (j = 0; j < filter->nb_outputs; j++) {                     \
485             AVFilterLink *out_link = filter->outputs[j];               \
486             list_type *fmts;                                           \
487                                                                        \
488             if (link->type != out_link->type ||                        \
489                 out_link->in_ ## list->nb == 1)                        \
490                 continue;                                              \
491             fmts = out_link->in_ ## list;                              \
492                                                                        \
493             if (!out_link->in_ ## list->nb) {                          \
494                 add_format(&out_link->in_ ##list, fmt);                \
495                 break;                                                 \
496             }                                                          \
497                                                                        \
498             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
499                 if (fmts->var[k] == fmt) {                             \
500                     fmts->var[0]  = fmt;                               \
501                     fmts->nb = 1;                                      \
502                     ret = 1;                                           \
503                     break;                                             \
504                 }                                                      \
505         }                                                              \
506     }                                                                  \
507 } while (0)
508
509 static int reduce_formats_on_filter(AVFilterContext *filter)
510 {
511     int i, j, k, ret = 0;
512
513     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
514                    format_count, ff_add_format);
515     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
516                    format_count, ff_add_format);
517     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
518                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
519
520     return ret;
521 }
522
523 static void reduce_formats(AVFilterGraph *graph)
524 {
525     int i, reduced;
526
527     do {
528         reduced = 0;
529
530         for (i = 0; i < graph->filter_count; i++)
531             reduced |= reduce_formats_on_filter(graph->filters[i]);
532     } while (reduced);
533 }
534
535 static void swap_samplerates_on_filter(AVFilterContext *filter)
536 {
537     AVFilterLink *link = NULL;
538     int sample_rate;
539     int i, j;
540
541     for (i = 0; i < filter->nb_inputs; i++) {
542         link = filter->inputs[i];
543
544         if (link->type == AVMEDIA_TYPE_AUDIO &&
545             link->out_samplerates->format_count == 1)
546             break;
547     }
548     if (i == filter->nb_inputs)
549         return;
550
551     sample_rate = link->out_samplerates->formats[0];
552
553     for (i = 0; i < filter->nb_outputs; i++) {
554         AVFilterLink *outlink = filter->outputs[i];
555         int best_idx, best_diff = INT_MAX;
556
557         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
558             outlink->in_samplerates->format_count < 2)
559             continue;
560
561         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
562             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
563
564             if (diff < best_diff) {
565                 best_diff = diff;
566                 best_idx  = j;
567             }
568         }
569         FFSWAP(int, outlink->in_samplerates->formats[0],
570                outlink->in_samplerates->formats[best_idx]);
571     }
572 }
573
574 static void swap_samplerates(AVFilterGraph *graph)
575 {
576     int i;
577
578     for (i = 0; i < graph->filter_count; i++)
579         swap_samplerates_on_filter(graph->filters[i]);
580 }
581
582 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
583 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
584 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
585 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
586 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
587 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
588 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
589
590 /* allowable substitutions for channel pairs when comparing layouts,
591  * ordered by priority for both values */
592 static const uint64_t ch_subst[][2] = {
593     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
594     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
595     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
596     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
597     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
598     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
599     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
600     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
601     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
602     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
603     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
604     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
605     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
606     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
607     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
608     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
609     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
610     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
611     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
612     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
613     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
614 };
615
616 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
617 {
618     AVFilterLink *link = NULL;
619     int i, j, k;
620
621     for (i = 0; i < filter->nb_inputs; i++) {
622         link = filter->inputs[i];
623
624         if (link->type == AVMEDIA_TYPE_AUDIO &&
625             link->out_channel_layouts->nb_channel_layouts == 1)
626             break;
627     }
628     if (i == filter->nb_inputs)
629         return;
630
631     for (i = 0; i < filter->nb_outputs; i++) {
632         AVFilterLink *outlink = filter->outputs[i];
633         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
634
635         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
636             outlink->in_channel_layouts->nb_channel_layouts < 2)
637             continue;
638
639         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
640             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
641             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
642             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
643             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
644             int count_diff        = out_channels - in_channels;
645             int matched_channels, extra_channels;
646             int score = 0;
647
648             /* channel substitution */
649             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
650                 uint64_t cmp0 = ch_subst[k][0];
651                 uint64_t cmp1 = ch_subst[k][1];
652                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
653                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
654                     in_chlayout  &= ~cmp0;
655                     out_chlayout &= ~cmp1;
656                     /* add score for channel match, minus a deduction for
657                        having to do the substitution */
658                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
659                 }
660             }
661
662             /* no penalty for LFE channel mismatch */
663             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
664                 (out_chlayout & AV_CH_LOW_FREQUENCY))
665                 score += 10;
666             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
667             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
668
669             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
670                                                                  out_chlayout);
671             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
672                                                                  (~in_chlayout));
673             score += 10 * matched_channels - 5 * extra_channels;
674
675             if (score > best_score ||
676                 (count_diff < best_count_diff && score == best_score)) {
677                 best_score = score;
678                 best_idx   = j;
679                 best_count_diff = count_diff;
680             }
681         }
682         av_assert0(best_idx >= 0);
683         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
684                outlink->in_channel_layouts->channel_layouts[best_idx]);
685     }
686
687 }
688
689 static void swap_channel_layouts(AVFilterGraph *graph)
690 {
691     int i;
692
693     for (i = 0; i < graph->filter_count; i++)
694         swap_channel_layouts_on_filter(graph->filters[i]);
695 }
696
697 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
698 {
699     AVFilterLink *link = NULL;
700     int format, bps;
701     int i, j;
702
703     for (i = 0; i < filter->nb_inputs; i++) {
704         link = filter->inputs[i];
705
706         if (link->type == AVMEDIA_TYPE_AUDIO &&
707             link->out_formats->format_count == 1)
708             break;
709     }
710     if (i == filter->nb_inputs)
711         return;
712
713     format = link->out_formats->formats[0];
714     bps    = av_get_bytes_per_sample(format);
715
716     for (i = 0; i < filter->nb_outputs; i++) {
717         AVFilterLink *outlink = filter->outputs[i];
718         int best_idx = -1, best_score = INT_MIN;
719
720         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
721             outlink->in_formats->format_count < 2)
722             continue;
723
724         for (j = 0; j < outlink->in_formats->format_count; j++) {
725             int out_format = outlink->in_formats->formats[j];
726             int out_bps    = av_get_bytes_per_sample(out_format);
727             int score;
728
729             if (av_get_packed_sample_fmt(out_format) == format ||
730                 av_get_planar_sample_fmt(out_format) == format) {
731                 best_idx   = j;
732                 break;
733             }
734
735             /* for s32 and float prefer double to prevent loss of information */
736             if (bps == 4 && out_bps == 8) {
737                 best_idx = j;
738                 break;
739             }
740
741             /* prefer closest higher or equal bps */
742             score = -abs(out_bps - bps);
743             if (out_bps >= bps)
744                 score += INT_MAX/2;
745
746             if (score > best_score) {
747                 best_score = score;
748                 best_idx   = j;
749             }
750         }
751         av_assert0(best_idx >= 0);
752         FFSWAP(int, outlink->in_formats->formats[0],
753                outlink->in_formats->formats[best_idx]);
754     }
755 }
756
757 static void swap_sample_fmts(AVFilterGraph *graph)
758 {
759     int i;
760
761     for (i = 0; i < graph->filter_count; i++)
762         swap_sample_fmts_on_filter(graph->filters[i]);
763
764 }
765
766 static int pick_formats(AVFilterGraph *graph)
767 {
768     int i, j, ret;
769     int change;
770
771     do{
772         change = 0;
773         for (i = 0; i < graph->filter_count; i++) {
774             AVFilterContext *filter = graph->filters[i];
775             if (filter->nb_inputs){
776                 for (j = 0; j < filter->nb_inputs; j++){
777                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
778                         pick_format(filter->inputs[j], NULL);
779                         change = 1;
780                     }
781                 }
782             }
783             if (filter->nb_outputs){
784                 for (j = 0; j < filter->nb_outputs; j++){
785                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
786                         pick_format(filter->outputs[j], NULL);
787                         change = 1;
788                     }
789                 }
790             }
791             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
792                 for (j = 0; j < filter->nb_outputs; j++) {
793                     if(filter->outputs[j]->format<0) {
794                         pick_format(filter->outputs[j], filter->inputs[0]);
795                         change = 1;
796                     }
797                 }
798             }
799         }
800     }while(change);
801
802     for (i = 0; i < graph->filter_count; i++) {
803         AVFilterContext *filter = graph->filters[i];
804
805         for (j = 0; j < filter->nb_inputs; j++)
806             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
807                 return ret;
808         for (j = 0; j < filter->nb_outputs; j++)
809             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
810                 return ret;
811     }
812     return 0;
813 }
814
815 /**
816  * Configure the formats of all the links in the graph.
817  */
818 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
819 {
820     int ret;
821
822     /* find supported formats from sub-filters, and merge along links */
823     if ((ret = query_formats(graph, log_ctx)) < 0)
824         return ret;
825
826     /* Once everything is merged, it's possible that we'll still have
827      * multiple valid media format choices. We try to minimize the amount
828      * of format conversion inside filters */
829     reduce_formats(graph);
830
831     /* for audio filters, ensure the best format, sample rate and channel layout
832      * is selected */
833     swap_sample_fmts(graph);
834     swap_samplerates(graph);
835     swap_channel_layouts(graph);
836
837     if ((ret = pick_formats(graph)) < 0)
838         return ret;
839
840     return 0;
841 }
842
843 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
844                                              AVClass *log_ctx)
845 {
846     unsigned i, j;
847     int sink_links_count = 0, n = 0;
848     AVFilterContext *f;
849     AVFilterLink **sinks;
850
851     for (i = 0; i < graph->filter_count; i++) {
852         f = graph->filters[i];
853         for (j = 0; j < f->nb_inputs; j++) {
854             f->inputs[j]->graph     = graph;
855             f->inputs[j]->age_index = -1;
856         }
857         for (j = 0; j < f->nb_outputs; j++) {
858             f->outputs[j]->graph    = graph;
859             f->outputs[j]->age_index= -1;
860         }
861         if (!f->nb_outputs) {
862             if (f->nb_inputs > INT_MAX - sink_links_count)
863                 return AVERROR(EINVAL);
864             sink_links_count += f->nb_inputs;
865         }
866     }
867     sinks = av_calloc(sink_links_count, sizeof(*sinks));
868     if (!sinks)
869         return AVERROR(ENOMEM);
870     for (i = 0; i < graph->filter_count; i++) {
871         f = graph->filters[i];
872         if (!f->nb_outputs) {
873             for (j = 0; j < f->nb_inputs; j++) {
874                 sinks[n] = f->inputs[j];
875                 f->inputs[j]->age_index = n++;
876             }
877         }
878     }
879     av_assert0(n == sink_links_count);
880     graph->sink_links       = sinks;
881     graph->sink_links_count = sink_links_count;
882     return 0;
883 }
884
885 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
886 {
887     AVFilterContext *f;
888     int i, j, ret;
889     int fifo_count = 0;
890
891     for (i = 0; i < graph->filter_count; i++) {
892         f = graph->filters[i];
893
894         for (j = 0; j < f->nb_inputs; j++) {
895             AVFilterLink *link = f->inputs[j];
896             AVFilterContext *fifo_ctx;
897             AVFilter *fifo;
898             char name[32];
899
900             if (!link->dstpad->needs_fifo)
901                 continue;
902
903             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
904                    avfilter_get_by_name("fifo") :
905                    avfilter_get_by_name("afifo");
906
907             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
908
909             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
910                                                NULL, graph);
911             if (ret < 0)
912                 return ret;
913
914             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
915             if (ret < 0)
916                 return ret;
917         }
918     }
919
920     return 0;
921 }
922
923 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
924 {
925     int ret;
926
927     if ((ret = graph_check_validity(graphctx, log_ctx)))
928         return ret;
929     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
930         return ret;
931     if ((ret = graph_config_formats(graphctx, log_ctx)))
932         return ret;
933     if ((ret = graph_config_links(graphctx, log_ctx)))
934         return ret;
935     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
936         return ret;
937
938     return 0;
939 }
940
941 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
942 {
943     int i, r = AVERROR(ENOSYS);
944
945     if(!graph)
946         return r;
947
948     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
949         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
950         if(r != AVERROR(ENOSYS))
951             return r;
952     }
953
954     if(res_len && res)
955         res[0]= 0;
956
957     for (i = 0; i < graph->filter_count; i++) {
958         AVFilterContext *filter = graph->filters[i];
959         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
960             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
961             if(r != AVERROR(ENOSYS)) {
962                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
963                     return r;
964             }
965         }
966     }
967
968     return r;
969 }
970
971 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
972 {
973     int i;
974
975     if(!graph)
976         return 0;
977
978     for (i = 0; i < graph->filter_count; i++) {
979         AVFilterContext *filter = graph->filters[i];
980         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
981             AVFilterCommand **que = &filter->command_queue, *next;
982             while(*que && (*que)->time <= ts)
983                 que = &(*que)->next;
984             next= *que;
985             *que= av_mallocz(sizeof(AVFilterCommand));
986             (*que)->command = av_strdup(command);
987             (*que)->arg     = av_strdup(arg);
988             (*que)->time    = ts;
989             (*que)->flags   = flags;
990             (*que)->next    = next;
991             if(flags & AVFILTER_CMD_FLAG_ONE)
992                 return 0;
993         }
994     }
995
996     return 0;
997 }
998
999 static void heap_bubble_up(AVFilterGraph *graph,
1000                            AVFilterLink *link, int index)
1001 {
1002     AVFilterLink **links = graph->sink_links;
1003
1004     while (index) {
1005         int parent = (index - 1) >> 1;
1006         if (links[parent]->current_pts >= link->current_pts)
1007             break;
1008         links[index] = links[parent];
1009         links[index]->age_index = index;
1010         index = parent;
1011     }
1012     links[index] = link;
1013     link->age_index = index;
1014 }
1015
1016 static void heap_bubble_down(AVFilterGraph *graph,
1017                              AVFilterLink *link, int index)
1018 {
1019     AVFilterLink **links = graph->sink_links;
1020
1021     while (1) {
1022         int child = 2 * index + 1;
1023         if (child >= graph->sink_links_count)
1024             break;
1025         if (child + 1 < graph->sink_links_count &&
1026             links[child + 1]->current_pts < links[child]->current_pts)
1027             child++;
1028         if (link->current_pts < links[child]->current_pts)
1029             break;
1030         links[index] = links[child];
1031         links[index]->age_index = index;
1032         index = child;
1033     }
1034     links[index] = link;
1035     link->age_index = index;
1036 }
1037
1038 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1039 {
1040     heap_bubble_up  (graph, link, link->age_index);
1041     heap_bubble_down(graph, link, link->age_index);
1042 }
1043
1044
1045 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1046 {
1047     while (graph->sink_links_count) {
1048         AVFilterLink *oldest = graph->sink_links[0];
1049         int r = ff_request_frame(oldest);
1050         if (r != AVERROR_EOF)
1051             return r;
1052         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1053                oldest->dst ? oldest->dst->name : "unknown",
1054                oldest->dstpad ? oldest->dstpad->name : "unknown");
1055         /* EOF: remove the link from the heap */
1056         if (oldest->age_index < --graph->sink_links_count)
1057             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1058                              oldest->age_index);
1059         oldest->age_index = -1;
1060     }
1061     return AVERROR_EOF;
1062 }