git.sesse.net Git - ffmpeg/blob - 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_descriptors[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 }