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 "config.h"
  24
  25 #include <string.h>
  26
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/avstring.h"
  29 #include "libavutil/bprint.h"
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/opt.h"
  32 #include "libavutil/pixdesc.h"
  33 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
  34
  35 #include "avfilter.h"
  36 #include "formats.h"
  37 #include "internal.h"
  38 #include "thread.h"
  39
  40 #define OFFSET(x) offsetof(AVFilterGraph, x)
  41 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  42 static const AVOption filtergraph_options[] = {
  43     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  44         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
  45         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
  46     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  47         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
  48     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  49         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  50     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  51         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  52     { NULL },
  53 };
  54
  55 static const AVClass filtergraph_class = {
  56     .class_name = "AVFilterGraph",
  57     .item_name  = av_default_item_name,
  58     .version    = LIBAVUTIL_VERSION_INT,
  59     .option     = filtergraph_options,
  60     .category   = AV_CLASS_CATEGORY_FILTER,
  61 };
  62
  63 #if !HAVE_THREADS
  64 void ff_graph_thread_free(AVFilterGraph *graph)
  65 {
  66 }
  67
  68 int ff_graph_thread_init(AVFilterGraph *graph)
  69 {
  70     graph->thread_type = 0;
  71     graph->nb_threads  = 1;
  72     return 0;
  73 }
  74 #endif
  75
  76 AVFilterGraph *avfilter_graph_alloc(void)
  77 {
  78     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  79     if (!ret)
  80         return NULL;
  81
  82     ret->internal = av_mallocz(sizeof(*ret->internal));
  83     if (!ret->internal) {
  84         av_freep(&ret);
  85         return NULL;
  86     }
  87
  88     ret->av_class = &filtergraph_class;
  89     av_opt_set_defaults(ret);
  90
  91     return ret;
  92 }
  93
  94 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
  95 {
  96     int i;
  97     for (i = 0; i < graph->nb_filters; i++) {
  98         if (graph->filters[i] == filter) {
  99             FFSWAP(AVFilterContext*, graph->filters[i],
 100                    graph->filters[graph->nb_filters - 1]);
 101             graph->nb_filters--;
 102             return;
 103         }
 104     }
 105 }
 106
 107 void avfilter_graph_free(AVFilterGraph **graph)
 108 {
 109     if (!*graph)
 110         return;
 111
 112     while ((*graph)->nb_filters)
 113         avfilter_free((*graph)->filters[0]);
 114
 115     ff_graph_thread_free(*graph);
 116
 117     av_freep(&(*graph)->sink_links);
 118
 119     av_freep(&(*graph)->scale_sws_opts);
 120     av_freep(&(*graph)->aresample_swr_opts);
 121     av_freep(&(*graph)->resample_lavr_opts);
 122     av_freep(&(*graph)->filters);
 123     av_freep(&(*graph)->internal);
 124     av_freep(graph);
 125 }
 126
 127 #if FF_API_AVFILTER_OPEN
 128 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 129 {
 130     AVFilterContext **filters = av_realloc(graph->filters,
 131                                            sizeof(*filters) * (graph->nb_filters + 1));
 132     if (!filters)
 133         return AVERROR(ENOMEM);
 134
 135     graph->filters = filters;
 136     graph->filters[graph->nb_filters++] = filter;
 137
 138 #if FF_API_FOO_COUNT
 139     graph->filter_count_unused = graph->nb_filters;
 140 #endif
 141
 142     filter->graph = graph;
 143
 144     return 0;
 145 }
 146 #endif
 147
 148 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
 149                                  const char *name, const char *args, void *opaque,
 150                                  AVFilterGraph *graph_ctx)
 151 {
 152     int ret;
 153
 154     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 155     if (!*filt_ctx)
 156         return AVERROR(ENOMEM);
 157
 158     ret = avfilter_init_str(*filt_ctx, args);
 159     if (ret < 0)
 160         goto fail;
 161
 162     return 0;
 163
 164 fail:
 165     if (*filt_ctx)
 166         avfilter_free(*filt_ctx);
 167     *filt_ctx = NULL;
 168     return ret;
 169 }
 170
 171 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 172 {
 173     graph->disable_auto_convert = flags;
 174 }
 175
 176 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 177                                              const AVFilter *filter,
 178                                              const char *name)
 179 {
 180     AVFilterContext **filters, *s;
 181
 182     if (graph->thread_type && !graph->internal->thread) {
 183         int ret = ff_graph_thread_init(graph);
 184         if (ret < 0) {
 185             av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
 186             return NULL;
 187         }
 188     }
 189
 190     s = ff_filter_alloc(filter, name);
 191     if (!s)
 192         return NULL;
 193
 194     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 195     if (!filters) {
 196         avfilter_free(s);
 197         return NULL;
 198     }
 199
 200     graph->filters = filters;
 201     graph->filters[graph->nb_filters++] = s;
 202
 203 #if FF_API_FOO_COUNT
 204     graph->filter_count_unused = graph->nb_filters;
 205 #endif
 206
 207     s->graph = graph;
 208
 209     return s;
 210 }
 211
 212 /**
 213  * Check for the validity of graph.
 214  *
 215  * A graph is considered valid if all its input and output pads are
 216  * connected.
 217  *
 218  * @return 0 in case of success, a negative value otherwise
 219  */
 220 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 221 {
 222     AVFilterContext *filt;
 223     int i, j;
 224
 225     for (i = 0; i < graph->nb_filters; i++) {
 226         const AVFilterPad *pad;
 227         filt = graph->filters[i];
 228
 229         for (j = 0; j < filt->nb_inputs; j++) {
 230             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 231                 pad = &filt->input_pads[j];
 232                 av_log(log_ctx, AV_LOG_ERROR,
 233                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 234                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 235                 return AVERROR(EINVAL);
 236             }
 237         }
 238
 239         for (j = 0; j < filt->nb_outputs; j++) {
 240             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 241                 pad = &filt->output_pads[j];
 242                 av_log(log_ctx, AV_LOG_ERROR,
 243                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 244                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 245                 return AVERROR(EINVAL);
 246             }
 247         }
 248     }
 249
 250     return 0;
 251 }
 252
 253 /**
 254  * Configure all the links of graphctx.
 255  *
 256  * @return 0 in case of success, a negative value otherwise
 257  */
 258 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 259 {
 260     AVFilterContext *filt;
 261     int i, ret;
 262
 263     for (i = 0; i < graph->nb_filters; i++) {
 264         filt = graph->filters[i];
 265
 266         if (!filt->nb_outputs) {
 267             if ((ret = avfilter_config_links(filt)))
 268                 return ret;
 269         }
 270     }
 271
 272     return 0;
 273 }
 274
 275 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 276 {
 277     int i;
 278
 279     for (i = 0; i < graph->nb_filters; i++)
 280         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 281             return graph->filters[i];
 282
 283     return NULL;
 284 }
 285
 286 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 287 {
 288     if (!l)
 289         return;
 290     if (l->nb_channel_layouts) {
 291         if (l->all_layouts || l->all_counts)
 292             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 293         l->all_layouts = l->all_counts = 0;
 294     } else {
 295         if (l->all_counts && !l->all_layouts)
 296             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 297         l->all_layouts = 1;
 298     }
 299 }
 300
 301 static int filter_query_formats(AVFilterContext *ctx)
 302 {
 303     int ret, i;
 304     AVFilterFormats *formats;
 305     AVFilterChannelLayouts *chlayouts;
 306     AVFilterFormats *samplerates;
 307     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 308                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 309                             AVMEDIA_TYPE_VIDEO;
 310
 311     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 312         if (ret != AVERROR(EAGAIN))
 313             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 314                    ctx->name, av_err2str(ret));
 315         return ret;
 316     }
 317
 318     for (i = 0; i < ctx->nb_inputs; i++)
 319         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 320     for (i = 0; i < ctx->nb_outputs; i++)
 321         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 322
 323     formats = ff_all_formats(type);
 324     if (!formats)
 325         return AVERROR(ENOMEM);
 326     ff_set_common_formats(ctx, formats);
 327     if (type == AVMEDIA_TYPE_AUDIO) {
 328         samplerates = ff_all_samplerates();
 329         if (!samplerates)
 330             return AVERROR(ENOMEM);
 331         ff_set_common_samplerates(ctx, samplerates);
 332         chlayouts = ff_all_channel_layouts();
 333         if (!chlayouts)
 334             return AVERROR(ENOMEM);
 335         ff_set_common_channel_layouts(ctx, chlayouts);
 336     }
 337     return 0;
 338 }
 339
 340 static int formats_declared(AVFilterContext *f)
 341 {
 342     int i;
 343
 344     for (i = 0; i < f->nb_inputs; i++) {
 345         if (!f->inputs[i]->out_formats)
 346             return 0;
 347         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 348             !(f->inputs[i]->out_samplerates &&
 349               f->inputs[i]->out_channel_layouts))
 350             return 0;
 351     }
 352     for (i = 0; i < f->nb_outputs; i++) {
 353         if (!f->outputs[i]->in_formats)
 354             return 0;
 355         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 356             !(f->outputs[i]->in_samplerates &&
 357               f->outputs[i]->in_channel_layouts))
 358             return 0;
 359     }
 360     return 1;
 361 }
 362
 363 /**
 364  * Perform one round of query_formats() and merging formats lists on the
 365  * filter graph.
 366  * @return  >=0 if all links formats lists could be queried and merged;
 367  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 368  *          and a later call may succeed;
 369  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 370  *          was made and the negotiation is stuck;
 371  *          a negative error code if some other error happened
 372  */
 373 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 374 {
 375     int i, j, ret;
 376     int scaler_count = 0, resampler_count = 0;
 377     int count_queried = 0;        /* successful calls to query_formats() */
 378     int count_merged = 0;         /* successful merge of formats lists */
 379     int count_already_merged = 0; /* lists already merged */
 380     int count_delayed = 0;        /* lists that need to be merged later */
 381
 382     for (i = 0; i < graph->nb_filters; i++) {
 383         AVFilterContext *f = graph->filters[i];
 384         if (formats_declared(f))
 385             continue;
 386         if (f->filter->query_formats)
 387             ret = filter_query_formats(f);
 388         else
 389             ret = ff_default_query_formats(f);
 390         if (ret < 0 && ret != AVERROR(EAGAIN))
 391             return ret;
 392         /* note: EAGAIN could indicate a partial success, not counted yet */
 393         count_queried += ret >= 0;
 394     }
 395
 396     /* go through and merge as many format lists as possible */
 397     for (i = 0; i < graph->nb_filters; i++) {
 398         AVFilterContext *filter = graph->filters[i];
 399
 400         for (j = 0; j < filter->nb_inputs; j++) {
 401             AVFilterLink *link = filter->inputs[j];
 402             int convert_needed = 0;
 403
 404             if (!link)
 405                 continue;
 406
 407 #define MERGE_DISPATCH(field, statement)                                     \
 408             if (!(link->in_ ## field && link->out_ ## field)) {              \
 409                 count_delayed++;                                             \
 410             } else if (link->in_ ## field == link->out_ ## field) {          \
 411                 count_already_merged++;                                      \
 412             } else {                                                         \
 413                 count_merged++;                                              \
 414                 statement                                                    \
 415             }
 416             MERGE_DISPATCH(formats,
 417                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 418                                       link->type))
 419                     convert_needed = 1;
 420             )
 421             if (link->type == AVMEDIA_TYPE_AUDIO) {
 422                 MERGE_DISPATCH(channel_layouts,
 423                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 424                                                   link->out_channel_layouts))
 425                         convert_needed = 1;
 426                 )
 427                 MERGE_DISPATCH(samplerates,
 428                     if (!ff_merge_samplerates(link->in_samplerates,
 429                                               link->out_samplerates))
 430                         convert_needed = 1;
 431                 )
 432             }
 433 #undef MERGE_DISPATCH
 434
 435             if (convert_needed) {
 436                 AVFilterContext *convert;
 437                 AVFilter *filter;
 438                 AVFilterLink *inlink, *outlink;
 439                 char scale_args[256];
 440                 char inst_name[30];
 441
 442                 /* couldn't merge format lists. auto-insert conversion filter */
 443                 switch (link->type) {
 444                 case AVMEDIA_TYPE_VIDEO:
 445                     if (!(filter = avfilter_get_by_name("scale"))) {
 446                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 447                                "not present, cannot convert pixel formats.\n");
 448                         return AVERROR(EINVAL);
 449                     }
 450
 451                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 452                              scaler_count++);
 453
 454                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 455                                                             inst_name, graph->scale_sws_opts, NULL,
 456                                                             graph)) < 0)
 457                         return ret;
 458                     break;
 459                 case AVMEDIA_TYPE_AUDIO:
 460                     if (!(filter = avfilter_get_by_name("aresample"))) {
 461                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 462                                "not present, cannot convert audio formats.\n");
 463                         return AVERROR(EINVAL);
 464                     }
 465
 466                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 467                              resampler_count++);
 468                     scale_args[0] = '\0';
 469                     if (graph->aresample_swr_opts)
 470                         snprintf(scale_args, sizeof(scale_args), "%s",
 471                                  graph->aresample_swr_opts);
 472                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 473                                                             inst_name, graph->aresample_swr_opts,
 474                                                             NULL, graph)) < 0)
 475                         return ret;
 476                     break;
 477                 default:
 478                     return AVERROR(EINVAL);
 479                 }
 480
 481                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 482                     return ret;
 483
 484                 filter_query_formats(convert);
 485                 inlink  = convert->inputs[0];
 486                 outlink = convert->outputs[0];
 487                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 488                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 489                     ret |= AVERROR(ENOSYS);
 490                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 491                     (!ff_merge_samplerates(inlink->in_samplerates,
 492                                            inlink->out_samplerates) ||
 493                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 494                                                inlink->out_channel_layouts)))
 495                     ret |= AVERROR(ENOSYS);
 496                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 497                     (!ff_merge_samplerates(outlink->in_samplerates,
 498                                            outlink->out_samplerates) ||
 499                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 500                                                outlink->out_channel_layouts)))
 501                     ret |= AVERROR(ENOSYS);
 502
 503                 if (ret < 0) {
 504                     av_log(log_ctx, AV_LOG_ERROR,
 505                            "Impossible to convert between the formats supported by the filter "
 506                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 507                     return ret;
 508                 }
 509             }
 510         }
 511     }
 512
 513     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 514            "%d queried, %d merged, %d already done, %d delayed\n",
 515            count_queried, count_merged, count_already_merged, count_delayed);
 516     if (count_delayed) {
 517         AVBPrint bp;
 518
 519         /* if count_queried > 0, one filter at least did set its formats,
 520            that will give additional information to its neighbour;
 521            if count_merged > 0, one pair of formats lists at least was merged,
 522            that will give additional information to all connected filters;
 523            in both cases, progress was made and a new round must be done */
 524         if (count_queried || count_merged)
 525             return AVERROR(EAGAIN);
 526         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 527         for (i = 0; i < graph->nb_filters; i++)
 528             if (!formats_declared(graph->filters[i]))
 529                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 530                           graph->filters[i]->name);
 531         av_log(graph, AV_LOG_ERROR,
 532                "The following filters could not choose their formats: %s\n"
 533                "Consider inserting the (a)format filter near their input or "
 534                "output.\n", bp.str);
 535         return AVERROR(EIO);
 536     }
 537     return 0;
 538 }
 539
 540 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 541 {
 542     if (!link || !link->in_formats)
 543         return 0;
 544
 545     if (link->type == AVMEDIA_TYPE_VIDEO) {
 546         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 547             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 548             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 549             int i;
 550             for (i=0; i<link->in_formats->nb_formats; i++) {
 551                 enum AVPixelFormat p = link->in_formats->formats[i];
 552                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 553             }
 554             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 555                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 556                    av_get_pix_fmt_name(ref->format), has_alpha);
 557             link->in_formats->formats[0] = best;
 558         }
 559     }
 560
 561     link->in_formats->nb_formats = 1;
 562     link->format = link->in_formats->formats[0];
 563
 564     if (link->type == AVMEDIA_TYPE_AUDIO) {
 565         if (!link->in_samplerates->nb_formats) {
 566             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 567                    " the link between filters %s and %s.\n", link->src->name,
 568                    link->dst->name);
 569             return AVERROR(EINVAL);
 570         }
 571         link->in_samplerates->nb_formats = 1;
 572         link->sample_rate = link->in_samplerates->formats[0];
 573
 574         if (link->in_channel_layouts->all_layouts) {
 575             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 576                    " the link between filters %s and %s.\n", link->src->name,
 577                    link->dst->name);
 578             return AVERROR(EINVAL);
 579         }
 580         link->in_channel_layouts->nb_channel_layouts = 1;
 581         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 582         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 583             link->channel_layout = 0;
 584         else
 585             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 586     }
 587
 588     ff_formats_unref(&link->in_formats);
 589     ff_formats_unref(&link->out_formats);
 590     ff_formats_unref(&link->in_samplerates);
 591     ff_formats_unref(&link->out_samplerates);
 592     ff_channel_layouts_unref(&link->in_channel_layouts);
 593     ff_channel_layouts_unref(&link->out_channel_layouts);
 594
 595     return 0;
 596 }
 597
 598 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 599 do {                                                                   \
 600     for (i = 0; i < filter->nb_inputs; i++) {                          \
 601         AVFilterLink *link = filter->inputs[i];                        \
 602         fmt_type fmt;                                                  \
 603                                                                        \
 604         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 605             continue;                                                  \
 606         fmt = link->out_ ## list->var[0];                              \
 607                                                                        \
 608         for (j = 0; j < filter->nb_outputs; j++) {                     \
 609             AVFilterLink *out_link = filter->outputs[j];               \
 610             list_type *fmts;                                           \
 611                                                                        \
 612             if (link->type != out_link->type ||                        \
 613                 out_link->in_ ## list->nb == 1)                        \
 614                 continue;                                              \
 615             fmts = out_link->in_ ## list;                              \
 616                                                                        \
 617             if (!out_link->in_ ## list->nb) {                          \
 618                 add_format(&out_link->in_ ##list, fmt);                \
 619                 break;                                                 \
 620             }                                                          \
 621                                                                        \
 622             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 623                 if (fmts->var[k] == fmt) {                             \
 624                     fmts->var[0]  = fmt;                               \
 625                     fmts->nb = 1;                                      \
 626                     ret = 1;                                           \
 627                     break;                                             \
 628                 }                                                      \
 629         }                                                              \
 630     }                                                                  \
 631 } while (0)
 632
 633 static int reduce_formats_on_filter(AVFilterContext *filter)
 634 {
 635     int i, j, k, ret = 0;
 636
 637     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 638                    nb_formats, ff_add_format);
 639     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 640                    nb_formats, ff_add_format);
 641
 642     /* reduce channel layouts */
 643     for (i = 0; i < filter->nb_inputs; i++) {
 644         AVFilterLink *inlink = filter->inputs[i];
 645         uint64_t fmt;
 646
 647         if (!inlink->out_channel_layouts ||
 648             inlink->out_channel_layouts->nb_channel_layouts != 1)
 649             continue;
 650         fmt = inlink->out_channel_layouts->channel_layouts[0];
 651
 652         for (j = 0; j < filter->nb_outputs; j++) {
 653             AVFilterLink *outlink = filter->outputs[j];
 654             AVFilterChannelLayouts *fmts;
 655
 656             fmts = outlink->in_channel_layouts;
 657             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 658                 continue;
 659
 660             if (fmts->all_layouts) {
 661                 /* Turn the infinite list into a singleton */
 662                 fmts->all_layouts = fmts->all_counts  = 0;
 663                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 664                 break;
 665             }
 666
 667             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 668                 if (fmts->channel_layouts[k] == fmt) {
 669                     fmts->channel_layouts[0]  = fmt;
 670                     fmts->nb_channel_layouts = 1;
 671                     ret = 1;
 672                     break;
 673                 }
 674             }
 675         }
 676     }
 677
 678     return ret;
 679 }
 680
 681 static void reduce_formats(AVFilterGraph *graph)
 682 {
 683     int i, reduced;
 684
 685     do {
 686         reduced = 0;
 687
 688         for (i = 0; i < graph->nb_filters; i++)
 689             reduced |= reduce_formats_on_filter(graph->filters[i]);
 690     } while (reduced);
 691 }
 692
 693 static void swap_samplerates_on_filter(AVFilterContext *filter)
 694 {
 695     AVFilterLink *link = NULL;
 696     int sample_rate;
 697     int i, j;
 698
 699     for (i = 0; i < filter->nb_inputs; i++) {
 700         link = filter->inputs[i];
 701
 702         if (link->type == AVMEDIA_TYPE_AUDIO &&
 703             link->out_samplerates->nb_formats== 1)
 704             break;
 705     }
 706     if (i == filter->nb_inputs)
 707         return;
 708
 709     sample_rate = link->out_samplerates->formats[0];
 710
 711     for (i = 0; i < filter->nb_outputs; i++) {
 712         AVFilterLink *outlink = filter->outputs[i];
 713         int best_idx, best_diff = INT_MAX;
 714
 715         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 716             outlink->in_samplerates->nb_formats < 2)
 717             continue;
 718
 719         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 720             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 721
 722             if (diff < best_diff) {
 723                 best_diff = diff;
 724                 best_idx  = j;
 725             }
 726         }
 727         FFSWAP(int, outlink->in_samplerates->formats[0],
 728                outlink->in_samplerates->formats[best_idx]);
 729     }
 730 }
 731
 732 static void swap_samplerates(AVFilterGraph *graph)
 733 {
 734     int i;
 735
 736     for (i = 0; i < graph->nb_filters; i++)
 737         swap_samplerates_on_filter(graph->filters[i]);
 738 }
 739
 740 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 741 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 742 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 743 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 744 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 745 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 746 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 747
 748 /* allowable substitutions for channel pairs when comparing layouts,
 749  * ordered by priority for both values */
 750 static const uint64_t ch_subst[][2] = {
 751     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 752     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 753     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 754     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 755     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 756     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 757     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 758     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 759     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 760     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 761     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 762     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 763     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 764     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 765     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 766     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 767     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 768     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 769     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 770     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 771     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 772 };
 773
 774 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 775 {
 776     AVFilterLink *link = NULL;
 777     int i, j, k;
 778
 779     for (i = 0; i < filter->nb_inputs; i++) {
 780         link = filter->inputs[i];
 781
 782         if (link->type == AVMEDIA_TYPE_AUDIO &&
 783             link->out_channel_layouts->nb_channel_layouts == 1)
 784             break;
 785     }
 786     if (i == filter->nb_inputs)
 787         return;
 788
 789     for (i = 0; i < filter->nb_outputs; i++) {
 790         AVFilterLink *outlink = filter->outputs[i];
 791         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 792
 793         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 794             outlink->in_channel_layouts->nb_channel_layouts < 2)
 795             continue;
 796
 797         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 798             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 799             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 800             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 801             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 802             int count_diff        = out_channels - in_channels;
 803             int matched_channels, extra_channels;
 804             int score = 100000;
 805
 806             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 807                 /* Compute score in case the input or output layout encodes
 808                    a channel count; in this case the score is not altered by
 809                    the computation afterwards, as in_chlayout and
 810                    out_chlayout have both been set to 0 */
 811                 if (FF_LAYOUT2COUNT(in_chlayout))
 812                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 813                 if (FF_LAYOUT2COUNT(out_chlayout))
 814                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 815                 score -= 10000 + FFABS(out_channels - in_channels) +
 816                          (in_channels > out_channels ? 10000 : 0);
 817                 in_chlayout = out_chlayout = 0;
 818                 /* Let the remaining computation run, even if the score
 819                    value is not altered */
 820             }
 821
 822             /* channel substitution */
 823             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 824                 uint64_t cmp0 = ch_subst[k][0];
 825                 uint64_t cmp1 = ch_subst[k][1];
 826                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 827                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 828                     in_chlayout  &= ~cmp0;
 829                     out_chlayout &= ~cmp1;
 830                     /* add score for channel match, minus a deduction for
 831                        having to do the substitution */
 832                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 833                 }
 834             }
 835
 836             /* no penalty for LFE channel mismatch */
 837             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 838                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 839                 score += 10;
 840             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 841             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 842
 843             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 844                                                                  out_chlayout);
 845             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 846                                                                  (~in_chlayout));
 847             score += 10 * matched_channels - 5 * extra_channels;
 848
 849             if (score > best_score ||
 850                 (count_diff < best_count_diff && score == best_score)) {
 851                 best_score = score;
 852                 best_idx   = j;
 853                 best_count_diff = count_diff;
 854             }
 855         }
 856         av_assert0(best_idx >= 0);
 857         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 858                outlink->in_channel_layouts->channel_layouts[best_idx]);
 859     }
 860
 861 }
 862
 863 static void swap_channel_layouts(AVFilterGraph *graph)
 864 {
 865     int i;
 866
 867     for (i = 0; i < graph->nb_filters; i++)
 868         swap_channel_layouts_on_filter(graph->filters[i]);
 869 }
 870
 871 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 872 {
 873     AVFilterLink *link = NULL;
 874     int format, bps;
 875     int i, j;
 876
 877     for (i = 0; i < filter->nb_inputs; i++) {
 878         link = filter->inputs[i];
 879
 880         if (link->type == AVMEDIA_TYPE_AUDIO &&
 881             link->out_formats->nb_formats == 1)
 882             break;
 883     }
 884     if (i == filter->nb_inputs)
 885         return;
 886
 887     format = link->out_formats->formats[0];
 888     bps    = av_get_bytes_per_sample(format);
 889
 890     for (i = 0; i < filter->nb_outputs; i++) {
 891         AVFilterLink *outlink = filter->outputs[i];
 892         int best_idx = -1, best_score = INT_MIN;
 893
 894         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 895             outlink->in_formats->nb_formats < 2)
 896             continue;
 897
 898         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
 899             int out_format = outlink->in_formats->formats[j];
 900             int out_bps    = av_get_bytes_per_sample(out_format);
 901             int score;
 902
 903             if (av_get_packed_sample_fmt(out_format) == format ||
 904                 av_get_planar_sample_fmt(out_format) == format) {
 905                 best_idx   = j;
 906                 break;
 907             }
 908
 909             /* for s32 and float prefer double to prevent loss of information */
 910             if (bps == 4 && out_bps == 8) {
 911                 best_idx = j;
 912                 break;
 913             }
 914
 915             /* prefer closest higher or equal bps */
 916             score = -abs(out_bps - bps);
 917             if (out_bps >= bps)
 918                 score += INT_MAX/2;
 919
 920             if (score > best_score) {
 921                 best_score = score;
 922                 best_idx   = j;
 923             }
 924         }
 925         av_assert0(best_idx >= 0);
 926         FFSWAP(int, outlink->in_formats->formats[0],
 927                outlink->in_formats->formats[best_idx]);
 928     }
 929 }
 930
 931 static void swap_sample_fmts(AVFilterGraph *graph)
 932 {
 933     int i;
 934
 935     for (i = 0; i < graph->nb_filters; i++)
 936         swap_sample_fmts_on_filter(graph->filters[i]);
 937
 938 }
 939
 940 static int pick_formats(AVFilterGraph *graph)
 941 {
 942     int i, j, ret;
 943     int change;
 944
 945     do{
 946         change = 0;
 947         for (i = 0; i < graph->nb_filters; i++) {
 948             AVFilterContext *filter = graph->filters[i];
 949             if (filter->nb_inputs){
 950                 for (j = 0; j < filter->nb_inputs; j++){
 951                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
 952                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 953                             return ret;
 954                         change = 1;
 955                     }
 956                 }
 957             }
 958             if (filter->nb_outputs){
 959                 for (j = 0; j < filter->nb_outputs; j++){
 960                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
 961                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 962                             return ret;
 963                         change = 1;
 964                     }
 965                 }
 966             }
 967             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 968                 for (j = 0; j < filter->nb_outputs; j++) {
 969                     if(filter->outputs[j]->format<0) {
 970                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
 971                             return ret;
 972                         change = 1;
 973                     }
 974                 }
 975             }
 976         }
 977     }while(change);
 978
 979     for (i = 0; i < graph->nb_filters; i++) {
 980         AVFilterContext *filter = graph->filters[i];
 981
 982         for (j = 0; j < filter->nb_inputs; j++)
 983             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 984                 return ret;
 985         for (j = 0; j < filter->nb_outputs; j++)
 986             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 987                 return ret;
 988     }
 989     return 0;
 990 }
 991
 992 /**
 993  * Configure the formats of all the links in the graph.
 994  */
 995 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 996 {
 997     int ret;
 998
 999     /* find supported formats from sub-filters, and merge along links */
1000     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1001         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1002     if (ret < 0)
1003         return ret;
1004
1005     /* Once everything is merged, it's possible that we'll still have
1006      * multiple valid media format choices. We try to minimize the amount
1007      * of format conversion inside filters */
1008     reduce_formats(graph);
1009
1010     /* for audio filters, ensure the best format, sample rate and channel layout
1011      * is selected */
1012     swap_sample_fmts(graph);
1013     swap_samplerates(graph);
1014     swap_channel_layouts(graph);
1015
1016     if ((ret = pick_formats(graph)) < 0)
1017         return ret;
1018
1019     return 0;
1020 }
1021
1022 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
1023                                              AVClass *log_ctx)
1024 {
1025     unsigned i, j;
1026     int sink_links_count = 0, n = 0;
1027     AVFilterContext *f;
1028     AVFilterLink **sinks;
1029
1030     for (i = 0; i < graph->nb_filters; i++) {
1031         f = graph->filters[i];
1032         for (j = 0; j < f->nb_inputs; j++) {
1033             f->inputs[j]->graph     = graph;
1034             f->inputs[j]->age_index = -1;
1035         }
1036         for (j = 0; j < f->nb_outputs; j++) {
1037             f->outputs[j]->graph    = graph;
1038             f->outputs[j]->age_index= -1;
1039         }
1040         if (!f->nb_outputs) {
1041             if (f->nb_inputs > INT_MAX - sink_links_count)
1042                 return AVERROR(EINVAL);
1043             sink_links_count += f->nb_inputs;
1044         }
1045     }
1046     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1047     if (!sinks)
1048         return AVERROR(ENOMEM);
1049     for (i = 0; i < graph->nb_filters; i++) {
1050         f = graph->filters[i];
1051         if (!f->nb_outputs) {
1052             for (j = 0; j < f->nb_inputs; j++) {
1053                 sinks[n] = f->inputs[j];
1054                 f->inputs[j]->age_index = n++;
1055             }
1056         }
1057     }
1058     av_assert0(n == sink_links_count);
1059     graph->sink_links       = sinks;
1060     graph->sink_links_count = sink_links_count;
1061     return 0;
1062 }
1063
1064 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1065 {
1066     AVFilterContext *f;
1067     int i, j, ret;
1068     int fifo_count = 0;
1069
1070     for (i = 0; i < graph->nb_filters; i++) {
1071         f = graph->filters[i];
1072
1073         for (j = 0; j < f->nb_inputs; j++) {
1074             AVFilterLink *link = f->inputs[j];
1075             AVFilterContext *fifo_ctx;
1076             AVFilter *fifo;
1077             char name[32];
1078
1079             if (!link->dstpad->needs_fifo)
1080                 continue;
1081
1082             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1083                    avfilter_get_by_name("fifo") :
1084                    avfilter_get_by_name("afifo");
1085
1086             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1087
1088             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1089                                                NULL, graph);
1090             if (ret < 0)
1091                 return ret;
1092
1093             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1094             if (ret < 0)
1095                 return ret;
1096         }
1097     }
1098
1099     return 0;
1100 }
1101
1102 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1103 {
1104     int ret;
1105
1106     if ((ret = graph_check_validity(graphctx, log_ctx)))
1107         return ret;
1108     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1109         return ret;
1110     if ((ret = graph_config_formats(graphctx, log_ctx)))
1111         return ret;
1112     if ((ret = graph_config_links(graphctx, log_ctx)))
1113         return ret;
1114     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1115         return ret;
1116
1117     return 0;
1118 }
1119
1120 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1121 {
1122     int i, r = AVERROR(ENOSYS);
1123
1124     if (!graph)
1125         return r;
1126
1127     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1128         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1129         if (r != AVERROR(ENOSYS))
1130             return r;
1131     }
1132
1133     if (res_len && res)
1134         res[0] = 0;
1135
1136     for (i = 0; i < graph->nb_filters; i++) {
1137         AVFilterContext *filter = graph->filters[i];
1138         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1139             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1140             if (r != AVERROR(ENOSYS)) {
1141                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1142                     return r;
1143             }
1144         }
1145     }
1146
1147     return r;
1148 }
1149
1150 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1151 {
1152     int i;
1153
1154     if(!graph)
1155         return 0;
1156
1157     for (i = 0; i < graph->nb_filters; i++) {
1158         AVFilterContext *filter = graph->filters[i];
1159         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1160             AVFilterCommand **queue = &filter->command_queue, *next;
1161             while (*queue && (*queue)->time <= ts)
1162                 queue = &(*queue)->next;
1163             next = *queue;
1164             *queue = av_mallocz(sizeof(AVFilterCommand));
1165             (*queue)->command = av_strdup(command);
1166             (*queue)->arg     = av_strdup(arg);
1167             (*queue)->time    = ts;
1168             (*queue)->flags   = flags;
1169             (*queue)->next    = next;
1170             if(flags & AVFILTER_CMD_FLAG_ONE)
1171                 return 0;
1172         }
1173     }
1174
1175     return 0;
1176 }
1177
1178 static void heap_bubble_up(AVFilterGraph *graph,
1179                            AVFilterLink *link, int index)
1180 {
1181     AVFilterLink **links = graph->sink_links;
1182
1183     while (index) {
1184         int parent = (index - 1) >> 1;
1185         if (links[parent]->current_pts >= link->current_pts)
1186             break;
1187         links[index] = links[parent];
1188         links[index]->age_index = index;
1189         index = parent;
1190     }
1191     links[index] = link;
1192     link->age_index = index;
1193 }
1194
1195 static void heap_bubble_down(AVFilterGraph *graph,
1196                              AVFilterLink *link, int index)
1197 {
1198     AVFilterLink **links = graph->sink_links;
1199
1200     while (1) {
1201         int child = 2 * index + 1;
1202         if (child >= graph->sink_links_count)
1203             break;
1204         if (child + 1 < graph->sink_links_count &&
1205             links[child + 1]->current_pts < links[child]->current_pts)
1206             child++;
1207         if (link->current_pts < links[child]->current_pts)
1208             break;
1209         links[index] = links[child];
1210         links[index]->age_index = index;
1211         index = child;
1212     }
1213     links[index] = link;
1214     link->age_index = index;
1215 }
1216
1217 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1218 {
1219     heap_bubble_up  (graph, link, link->age_index);
1220     heap_bubble_down(graph, link, link->age_index);
1221 }
1222
1223
1224 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1225 {
1226     while (graph->sink_links_count) {
1227         AVFilterLink *oldest = graph->sink_links[0];
1228         int r = ff_request_frame(oldest);
1229         if (r != AVERROR_EOF)
1230             return r;
1231         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1232                oldest->dst ? oldest->dst->name : "unknown",
1233                oldest->dstpad ? oldest->dstpad->name : "unknown");
1234         /* EOF: remove the link from the heap */
1235         if (oldest->age_index < --graph->sink_links_count)
1236             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1237                              oldest->age_index);
1238         oldest->age_index = -1;
1239     }
1240     return AVERROR_EOF;
1241 }