Merge commit '36ef5369ee9b336febc2c270f8718cec4476cb85'
[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_fmt2()
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/log.h"
38
39 static const AVClass filtergraph_class = {
40     .class_name = "AVFilterGraph",
41     .item_name  = av_default_item_name,
42     .version    = LIBAVUTIL_VERSION_INT,
43     .category   = AV_CLASS_CATEGORY_FILTER,
44 };
45
46 AVFilterGraph *avfilter_graph_alloc(void)
47 {
48     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
49     if (!ret)
50         return NULL;
51     ret->av_class = &filtergraph_class;
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, "'aresample' 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             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
434                    av_get_pix_fmt_name(best), link->in_formats->format_count,
435                    av_get_pix_fmt_name(ref->format), has_alpha);
436             link->in_formats->formats[0] = best;
437         }
438     }
439
440     link->in_formats->format_count = 1;
441     link->format = link->in_formats->formats[0];
442
443     if (link->type == AVMEDIA_TYPE_AUDIO) {
444         if (!link->in_samplerates->format_count) {
445             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
446                    " the link between filters %s and %s.\n", link->src->name,
447                    link->dst->name);
448             return AVERROR(EINVAL);
449         }
450         link->in_samplerates->format_count = 1;
451         link->sample_rate = link->in_samplerates->formats[0];
452
453         if (!link->in_channel_layouts->nb_channel_layouts) {
454             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
455                    "the link between filters %s and %s.\n", link->src->name,
456                    link->dst->name);
457             return AVERROR(EINVAL);
458         }
459         link->in_channel_layouts->nb_channel_layouts = 1;
460         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
461     }
462
463     ff_formats_unref(&link->in_formats);
464     ff_formats_unref(&link->out_formats);
465     ff_formats_unref(&link->in_samplerates);
466     ff_formats_unref(&link->out_samplerates);
467     ff_channel_layouts_unref(&link->in_channel_layouts);
468     ff_channel_layouts_unref(&link->out_channel_layouts);
469
470     return 0;
471 }
472
473 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
474 do {                                                                   \
475     for (i = 0; i < filter->nb_inputs; i++) {                          \
476         AVFilterLink *link = filter->inputs[i];                        \
477         fmt_type fmt;                                                  \
478                                                                        \
479         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
480             continue;                                                  \
481         fmt = link->out_ ## list->var[0];                              \
482                                                                        \
483         for (j = 0; j < filter->nb_outputs; j++) {                     \
484             AVFilterLink *out_link = filter->outputs[j];               \
485             list_type *fmts;                                           \
486                                                                        \
487             if (link->type != out_link->type ||                        \
488                 out_link->in_ ## list->nb == 1)                        \
489                 continue;                                              \
490             fmts = out_link->in_ ## list;                              \
491                                                                        \
492             if (!out_link->in_ ## list->nb) {                          \
493                 add_format(&out_link->in_ ##list, fmt);                \
494                 break;                                                 \
495             }                                                          \
496                                                                        \
497             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
498                 if (fmts->var[k] == fmt) {                             \
499                     fmts->var[0]  = fmt;                               \
500                     fmts->nb = 1;                                      \
501                     ret = 1;                                           \
502                     break;                                             \
503                 }                                                      \
504         }                                                              \
505     }                                                                  \
506 } while (0)
507
508 static int reduce_formats_on_filter(AVFilterContext *filter)
509 {
510     int i, j, k, ret = 0;
511
512     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
513                    format_count, ff_add_format);
514     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
515                    format_count, ff_add_format);
516     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
517                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
518
519     return ret;
520 }
521
522 static void reduce_formats(AVFilterGraph *graph)
523 {
524     int i, reduced;
525
526     do {
527         reduced = 0;
528
529         for (i = 0; i < graph->filter_count; i++)
530             reduced |= reduce_formats_on_filter(graph->filters[i]);
531     } while (reduced);
532 }
533
534 static void swap_samplerates_on_filter(AVFilterContext *filter)
535 {
536     AVFilterLink *link = NULL;
537     int sample_rate;
538     int i, j;
539
540     for (i = 0; i < filter->nb_inputs; i++) {
541         link = filter->inputs[i];
542
543         if (link->type == AVMEDIA_TYPE_AUDIO &&
544             link->out_samplerates->format_count == 1)
545             break;
546     }
547     if (i == filter->nb_inputs)
548         return;
549
550     sample_rate = link->out_samplerates->formats[0];
551
552     for (i = 0; i < filter->nb_outputs; i++) {
553         AVFilterLink *outlink = filter->outputs[i];
554         int best_idx, best_diff = INT_MAX;
555
556         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
557             outlink->in_samplerates->format_count < 2)
558             continue;
559
560         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
561             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
562
563             if (diff < best_diff) {
564                 best_diff = diff;
565                 best_idx  = j;
566             }
567         }
568         FFSWAP(int, outlink->in_samplerates->formats[0],
569                outlink->in_samplerates->formats[best_idx]);
570     }
571 }
572
573 static void swap_samplerates(AVFilterGraph *graph)
574 {
575     int i;
576
577     for (i = 0; i < graph->filter_count; i++)
578         swap_samplerates_on_filter(graph->filters[i]);
579 }
580
581 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
582 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
583 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
584 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
585 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
586 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
587 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
588
589 /* allowable substitutions for channel pairs when comparing layouts,
590  * ordered by priority for both values */
591 static const uint64_t ch_subst[][2] = {
592     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
593     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
594     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
595     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
596     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
597     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
598     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
599     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
600     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
601     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
602     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
603     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
604     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
605     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
606     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
607     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
608     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
609     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
610     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
611     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
612     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
613 };
614
615 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
616 {
617     AVFilterLink *link = NULL;
618     int i, j, k;
619
620     for (i = 0; i < filter->nb_inputs; i++) {
621         link = filter->inputs[i];
622
623         if (link->type == AVMEDIA_TYPE_AUDIO &&
624             link->out_channel_layouts->nb_channel_layouts == 1)
625             break;
626     }
627     if (i == filter->nb_inputs)
628         return;
629
630     for (i = 0; i < filter->nb_outputs; i++) {
631         AVFilterLink *outlink = filter->outputs[i];
632         int best_idx, best_score = INT_MIN, best_count_diff = INT_MAX;
633
634         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
635             outlink->in_channel_layouts->nb_channel_layouts < 2)
636             continue;
637
638         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
639             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
640             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
641             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
642             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
643             int count_diff        = out_channels - in_channels;
644             int matched_channels, extra_channels;
645             int score = 0;
646
647             /* channel substitution */
648             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
649                 uint64_t cmp0 = ch_subst[k][0];
650                 uint64_t cmp1 = ch_subst[k][1];
651                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
652                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
653                     in_chlayout  &= ~cmp0;
654                     out_chlayout &= ~cmp1;
655                     /* add score for channel match, minus a deduction for
656                        having to do the substitution */
657                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
658                 }
659             }
660
661             /* no penalty for LFE channel mismatch */
662             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
663                 (out_chlayout & AV_CH_LOW_FREQUENCY))
664                 score += 10;
665             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
666             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
667
668             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
669                                                                  out_chlayout);
670             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
671                                                                  (~in_chlayout));
672             score += 10 * matched_channels - 5 * extra_channels;
673
674             if (score > best_score ||
675                 (count_diff < best_count_diff && score == best_score)) {
676                 best_score = score;
677                 best_idx   = j;
678                 best_count_diff = count_diff;
679             }
680         }
681         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
682                outlink->in_channel_layouts->channel_layouts[best_idx]);
683     }
684
685 }
686
687 static void swap_channel_layouts(AVFilterGraph *graph)
688 {
689     int i;
690
691     for (i = 0; i < graph->filter_count; i++)
692         swap_channel_layouts_on_filter(graph->filters[i]);
693 }
694
695 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
696 {
697     AVFilterLink *link = NULL;
698     int format, bps;
699     int i, j;
700
701     for (i = 0; i < filter->nb_inputs; i++) {
702         link = filter->inputs[i];
703
704         if (link->type == AVMEDIA_TYPE_AUDIO &&
705             link->out_formats->format_count == 1)
706             break;
707     }
708     if (i == filter->nb_inputs)
709         return;
710
711     format = link->out_formats->formats[0];
712     bps    = av_get_bytes_per_sample(format);
713
714     for (i = 0; i < filter->nb_outputs; i++) {
715         AVFilterLink *outlink = filter->outputs[i];
716         int best_idx = -1, best_score = INT_MIN;
717
718         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
719             outlink->in_formats->format_count < 2)
720             continue;
721
722         for (j = 0; j < outlink->in_formats->format_count; j++) {
723             int out_format = outlink->in_formats->formats[j];
724             int out_bps    = av_get_bytes_per_sample(out_format);
725             int score;
726
727             if (av_get_packed_sample_fmt(out_format) == format ||
728                 av_get_planar_sample_fmt(out_format) == format) {
729                 best_idx   = j;
730                 break;
731             }
732
733             /* for s32 and float prefer double to prevent loss of information */
734             if (bps == 4 && out_bps == 8) {
735                 best_idx = j;
736                 break;
737             }
738
739             /* prefer closest higher or equal bps */
740             score = -abs(out_bps - bps);
741             if (out_bps >= bps)
742                 score += INT_MAX/2;
743
744             if (score > best_score) {
745                 best_score = score;
746                 best_idx   = j;
747             }
748         }
749         av_assert0(best_idx >= 0);
750         FFSWAP(int, outlink->in_formats->formats[0],
751                outlink->in_formats->formats[best_idx]);
752     }
753 }
754
755 static void swap_sample_fmts(AVFilterGraph *graph)
756 {
757     int i;
758
759     for (i = 0; i < graph->filter_count; i++)
760         swap_sample_fmts_on_filter(graph->filters[i]);
761
762 }
763
764 static int pick_formats(AVFilterGraph *graph)
765 {
766     int i, j, ret;
767     int change;
768
769     do{
770         change = 0;
771         for (i = 0; i < graph->filter_count; i++) {
772             AVFilterContext *filter = graph->filters[i];
773             if (filter->nb_inputs){
774                 for (j = 0; j < filter->nb_inputs; j++){
775                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
776                         pick_format(filter->inputs[j], NULL);
777                         change = 1;
778                     }
779                 }
780             }
781             if (filter->nb_outputs){
782                 for (j = 0; j < filter->nb_outputs; j++){
783                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
784                         pick_format(filter->outputs[j], NULL);
785                         change = 1;
786                     }
787                 }
788             }
789             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
790                 for (j = 0; j < filter->nb_outputs; j++) {
791                     if(filter->outputs[j]->format<0) {
792                         pick_format(filter->outputs[j], filter->inputs[0]);
793                         change = 1;
794                     }
795                 }
796             }
797         }
798     }while(change);
799
800     for (i = 0; i < graph->filter_count; i++) {
801         AVFilterContext *filter = graph->filters[i];
802
803         for (j = 0; j < filter->nb_inputs; j++)
804             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
805                 return ret;
806         for (j = 0; j < filter->nb_outputs; j++)
807             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
808                 return ret;
809     }
810     return 0;
811 }
812
813 /**
814  * Configure the formats of all the links in the graph.
815  */
816 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
817 {
818     int ret;
819
820     /* find supported formats from sub-filters, and merge along links */
821     if ((ret = query_formats(graph, log_ctx)) < 0)
822         return ret;
823
824     /* Once everything is merged, it's possible that we'll still have
825      * multiple valid media format choices. We try to minimize the amount
826      * of format conversion inside filters */
827     reduce_formats(graph);
828
829     /* for audio filters, ensure the best format, sample rate and channel layout
830      * is selected */
831     swap_sample_fmts(graph);
832     swap_samplerates(graph);
833     swap_channel_layouts(graph);
834
835     if ((ret = pick_formats(graph)) < 0)
836         return ret;
837
838     return 0;
839 }
840
841 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
842                                              AVClass *log_ctx)
843 {
844     unsigned i, j;
845     int sink_links_count = 0, n = 0;
846     AVFilterContext *f;
847     AVFilterLink **sinks;
848
849     for (i = 0; i < graph->filter_count; i++) {
850         f = graph->filters[i];
851         for (j = 0; j < f->nb_inputs; j++) {
852             f->inputs[j]->graph     = graph;
853             f->inputs[j]->age_index = -1;
854         }
855         for (j = 0; j < f->nb_outputs; j++) {
856             f->outputs[j]->graph    = graph;
857             f->outputs[j]->age_index= -1;
858         }
859         if (!f->nb_outputs) {
860             if (f->nb_inputs > INT_MAX - sink_links_count)
861                 return AVERROR(EINVAL);
862             sink_links_count += f->nb_inputs;
863         }
864     }
865     sinks = av_calloc(sink_links_count, sizeof(*sinks));
866     if (!sinks)
867         return AVERROR(ENOMEM);
868     for (i = 0; i < graph->filter_count; i++) {
869         f = graph->filters[i];
870         if (!f->nb_outputs) {
871             for (j = 0; j < f->nb_inputs; j++) {
872                 sinks[n] = f->inputs[j];
873                 f->inputs[j]->age_index = n++;
874             }
875         }
876     }
877     av_assert0(n == sink_links_count);
878     graph->sink_links       = sinks;
879     graph->sink_links_count = sink_links_count;
880     return 0;
881 }
882
883 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
884 {
885     AVFilterContext *f;
886     int i, j, ret;
887     int fifo_count = 0;
888
889     for (i = 0; i < graph->filter_count; i++) {
890         f = graph->filters[i];
891
892         for (j = 0; j < f->nb_inputs; j++) {
893             AVFilterLink *link = f->inputs[j];
894             AVFilterContext *fifo_ctx;
895             AVFilter *fifo;
896             char name[32];
897
898             if (!link->dstpad->needs_fifo)
899                 continue;
900
901             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
902                    avfilter_get_by_name("fifo") :
903                    avfilter_get_by_name("afifo");
904
905             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
906
907             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
908                                                NULL, graph);
909             if (ret < 0)
910                 return ret;
911
912             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
913             if (ret < 0)
914                 return ret;
915         }
916     }
917
918     return 0;
919 }
920
921 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
922 {
923     int ret;
924
925     if ((ret = graph_check_validity(graphctx, log_ctx)))
926         return ret;
927     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
928         return ret;
929     if ((ret = graph_config_formats(graphctx, log_ctx)))
930         return ret;
931     if ((ret = graph_config_links(graphctx, log_ctx)))
932         return ret;
933     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
934         return ret;
935
936     return 0;
937 }
938
939 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
940 {
941     int i, r = AVERROR(ENOSYS);
942
943     if(!graph)
944         return r;
945
946     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
947         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
948         if(r != AVERROR(ENOSYS))
949             return r;
950     }
951
952     if(res_len && res)
953         res[0]= 0;
954
955     for (i = 0; i < graph->filter_count; i++) {
956         AVFilterContext *filter = graph->filters[i];
957         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
958             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
959             if(r != AVERROR(ENOSYS)) {
960                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
961                     return r;
962             }
963         }
964     }
965
966     return r;
967 }
968
969 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
970 {
971     int i;
972
973     if(!graph)
974         return 0;
975
976     for (i = 0; i < graph->filter_count; i++) {
977         AVFilterContext *filter = graph->filters[i];
978         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
979             AVFilterCommand **que = &filter->command_queue, *next;
980             while(*que && (*que)->time <= ts)
981                 que = &(*que)->next;
982             next= *que;
983             *que= av_mallocz(sizeof(AVFilterCommand));
984             (*que)->command = av_strdup(command);
985             (*que)->arg     = av_strdup(arg);
986             (*que)->time    = ts;
987             (*que)->flags   = flags;
988             (*que)->next    = next;
989             if(flags & AVFILTER_CMD_FLAG_ONE)
990                 return 0;
991         }
992     }
993
994     return 0;
995 }
996
997 static void heap_bubble_up(AVFilterGraph *graph,
998                            AVFilterLink *link, int index)
999 {
1000     AVFilterLink **links = graph->sink_links;
1001
1002     while (index) {
1003         int parent = (index - 1) >> 1;
1004         if (links[parent]->current_pts >= link->current_pts)
1005             break;
1006         links[index] = links[parent];
1007         links[index]->age_index = index;
1008         index = parent;
1009     }
1010     links[index] = link;
1011     link->age_index = index;
1012 }
1013
1014 static void heap_bubble_down(AVFilterGraph *graph,
1015                              AVFilterLink *link, int index)
1016 {
1017     AVFilterLink **links = graph->sink_links;
1018
1019     while (1) {
1020         int child = 2 * index + 1;
1021         if (child >= graph->sink_links_count)
1022             break;
1023         if (child + 1 < graph->sink_links_count &&
1024             links[child + 1]->current_pts < links[child]->current_pts)
1025             child++;
1026         if (link->current_pts < links[child]->current_pts)
1027             break;
1028         links[index] = links[child];
1029         links[index]->age_index = index;
1030         index = child;
1031     }
1032     links[index] = link;
1033     link->age_index = index;
1034 }
1035
1036 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1037 {
1038     heap_bubble_up  (graph, link, link->age_index);
1039     heap_bubble_down(graph, link, link->age_index);
1040 }
1041
1042
1043 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1044 {
1045     while (graph->sink_links_count) {
1046         AVFilterLink *oldest = graph->sink_links[0];
1047         int r = ff_request_frame(oldest);
1048         if (r != AVERROR_EOF)
1049             return r;
1050         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1051                oldest->dst ? oldest->dst->name : "unknown",
1052                oldest->dstpad ? oldest->dstpad->name : "unknown");
1053         /* EOF: remove the link from the heap */
1054         if (oldest->age_index < --graph->sink_links_count)
1055             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1056                              oldest->age_index);
1057         oldest->age_index = -1;
1058     }
1059     return AVERROR_EOF;
1060 }