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/internal.h"
  32 #include "libavutil/opt.h"
  33 #include "libavutil/pixdesc.h"
  34 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
  35
  36 #include "avfilter.h"
  37 #include "formats.h"
  38 #include "internal.h"
  39 #include "thread.h"
  40
  41 #define OFFSET(x) offsetof(AVFilterGraph, x)
  42 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  43 static const AVOption filtergraph_options[] = {
  44     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  45         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
  46         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
  47     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  48         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
  49     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  50         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  51     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  52         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  53     { NULL },
  54 };
  55
  56 static const AVClass filtergraph_class = {
  57     .class_name = "AVFilterGraph",
  58     .item_name  = av_default_item_name,
  59     .version    = LIBAVUTIL_VERSION_INT,
  60     .option     = filtergraph_options,
  61     .category   = AV_CLASS_CATEGORY_FILTER,
  62 };
  63
  64 #if !HAVE_THREADS
  65 void ff_graph_thread_free(AVFilterGraph *graph)
  66 {
  67 }
  68
  69 int ff_graph_thread_init(AVFilterGraph *graph)
  70 {
  71     graph->thread_type = 0;
  72     graph->nb_threads  = 1;
  73     return 0;
  74 }
  75 #endif
  76
  77 AVFilterGraph *avfilter_graph_alloc(void)
  78 {
  79     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  80     if (!ret)
  81         return NULL;
  82
  83     ret->internal = av_mallocz(sizeof(*ret->internal));
  84     if (!ret->internal) {
  85         av_freep(&ret);
  86         return NULL;
  87     }
  88
  89     ret->av_class = &filtergraph_class;
  90     av_opt_set_defaults(ret);
  91
  92     return ret;
  93 }
  94
  95 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
  96 {
  97     int i;
  98     for (i = 0; i < graph->nb_filters; i++) {
  99         if (graph->filters[i] == filter) {
 100             FFSWAP(AVFilterContext*, graph->filters[i],
 101                    graph->filters[graph->nb_filters - 1]);
 102             graph->nb_filters--;
 103             return;
 104         }
 105     }
 106 }
 107
 108 void avfilter_graph_free(AVFilterGraph **graph)
 109 {
 110     if (!*graph)
 111         return;
 112
 113     while ((*graph)->nb_filters)
 114         avfilter_free((*graph)->filters[0]);
 115
 116     ff_graph_thread_free(*graph);
 117
 118     av_freep(&(*graph)->sink_links);
 119
 120     av_freep(&(*graph)->scale_sws_opts);
 121     av_freep(&(*graph)->aresample_swr_opts);
 122     av_freep(&(*graph)->resample_lavr_opts);
 123     av_freep(&(*graph)->filters);
 124     av_freep(&(*graph)->internal);
 125     av_freep(graph);
 126 }
 127
 128 #if FF_API_AVFILTER_OPEN
 129 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 130 {
 131     AVFilterContext **filters = av_realloc(graph->filters,
 132                                            sizeof(*filters) * (graph->nb_filters + 1));
 133     if (!filters)
 134         return AVERROR(ENOMEM);
 135
 136     graph->filters = filters;
 137     graph->filters[graph->nb_filters++] = filter;
 138
 139 #if FF_API_FOO_COUNT
 140 FF_DISABLE_DEPRECATION_WARNINGS
 141     graph->filter_count_unused = graph->nb_filters;
 142 FF_ENABLE_DEPRECATION_WARNINGS
 143 #endif
 144
 145     filter->graph = graph;
 146
 147     return 0;
 148 }
 149 #endif
 150
 151 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 152                                  const char *name, const char *args, void *opaque,
 153                                  AVFilterGraph *graph_ctx)
 154 {
 155     int ret;
 156
 157     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 158     if (!*filt_ctx)
 159         return AVERROR(ENOMEM);
 160
 161     ret = avfilter_init_str(*filt_ctx, args);
 162     if (ret < 0)
 163         goto fail;
 164
 165     return 0;
 166
 167 fail:
 168     if (*filt_ctx)
 169         avfilter_free(*filt_ctx);
 170     *filt_ctx = NULL;
 171     return ret;
 172 }
 173
 174 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 175 {
 176     graph->disable_auto_convert = flags;
 177 }
 178
 179 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 180                                              const AVFilter *filter,
 181                                              const char *name)
 182 {
 183     AVFilterContext **filters, *s;
 184
 185     if (graph->thread_type && !graph->internal->thread_execute) {
 186         if (graph->execute) {
 187             graph->internal->thread_execute = graph->execute;
 188         } else {
 189             int ret = ff_graph_thread_init(graph);
 190             if (ret < 0) {
 191                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
 192                 return NULL;
 193             }
 194         }
 195     }
 196
 197     s = ff_filter_alloc(filter, name);
 198     if (!s)
 199         return NULL;
 200
 201     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 202     if (!filters) {
 203         avfilter_free(s);
 204         return NULL;
 205     }
 206
 207     graph->filters = filters;
 208     graph->filters[graph->nb_filters++] = s;
 209
 210 #if FF_API_FOO_COUNT
 211 FF_DISABLE_DEPRECATION_WARNINGS
 212     graph->filter_count_unused = graph->nb_filters;
 213 FF_ENABLE_DEPRECATION_WARNINGS
 214 #endif
 215
 216     s->graph = graph;
 217
 218     return s;
 219 }
 220
 221 /**
 222  * Check for the validity of graph.
 223  *
 224  * A graph is considered valid if all its input and output pads are
 225  * connected.
 226  *
 227  * @return >= 0 in case of success, a negative value otherwise
 228  */
 229 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 230 {
 231     AVFilterContext *filt;
 232     int i, j;
 233
 234     for (i = 0; i < graph->nb_filters; i++) {
 235         const AVFilterPad *pad;
 236         filt = graph->filters[i];
 237
 238         for (j = 0; j < filt->nb_inputs; j++) {
 239             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 240                 pad = &filt->input_pads[j];
 241                 av_log(log_ctx, AV_LOG_ERROR,
 242                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 243                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 244                 return AVERROR(EINVAL);
 245             }
 246         }
 247
 248         for (j = 0; j < filt->nb_outputs; j++) {
 249             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 250                 pad = &filt->output_pads[j];
 251                 av_log(log_ctx, AV_LOG_ERROR,
 252                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 253                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 254                 return AVERROR(EINVAL);
 255             }
 256         }
 257     }
 258
 259     return 0;
 260 }
 261
 262 /**
 263  * Configure all the links of graphctx.
 264  *
 265  * @return >= 0 in case of success, a negative value otherwise
 266  */
 267 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 268 {
 269     AVFilterContext *filt;
 270     int i, ret;
 271
 272     for (i = 0; i < graph->nb_filters; i++) {
 273         filt = graph->filters[i];
 274
 275         if (!filt->nb_outputs) {
 276             if ((ret = avfilter_config_links(filt)))
 277                 return ret;
 278         }
 279     }
 280
 281     return 0;
 282 }
 283
 284 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 285 {
 286     int i;
 287
 288     for (i = 0; i < graph->nb_filters; i++)
 289         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 290             return graph->filters[i];
 291
 292     return NULL;
 293 }
 294
 295 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 296 {
 297     if (!l)
 298         return;
 299     if (l->nb_channel_layouts) {
 300         if (l->all_layouts || l->all_counts)
 301             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 302         l->all_layouts = l->all_counts = 0;
 303     } else {
 304         if (l->all_counts && !l->all_layouts)
 305             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 306         l->all_layouts = 1;
 307     }
 308 }
 309
 310 static int filter_query_formats(AVFilterContext *ctx)
 311 {
 312     int ret, i;
 313     AVFilterFormats *formats;
 314     AVFilterChannelLayouts *chlayouts;
 315     AVFilterFormats *samplerates;
 316     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 317                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 318                             AVMEDIA_TYPE_VIDEO;
 319
 320     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 321         if (ret != AVERROR(EAGAIN))
 322             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 323                    ctx->name, av_err2str(ret));
 324         return ret;
 325     }
 326
 327     for (i = 0; i < ctx->nb_inputs; i++)
 328         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 329     for (i = 0; i < ctx->nb_outputs; i++)
 330         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 331
 332     formats = ff_all_formats(type);
 333     if (!formats)
 334         return AVERROR(ENOMEM);
 335     ff_set_common_formats(ctx, formats);
 336     if (type == AVMEDIA_TYPE_AUDIO) {
 337         samplerates = ff_all_samplerates();
 338         if (!samplerates)
 339             return AVERROR(ENOMEM);
 340         ff_set_common_samplerates(ctx, samplerates);
 341         chlayouts = ff_all_channel_layouts();
 342         if (!chlayouts)
 343             return AVERROR(ENOMEM);
 344         ff_set_common_channel_layouts(ctx, chlayouts);
 345     }
 346     return 0;
 347 }
 348
 349 static int formats_declared(AVFilterContext *f)
 350 {
 351     int i;
 352
 353     for (i = 0; i < f->nb_inputs; i++) {
 354         if (!f->inputs[i]->out_formats)
 355             return 0;
 356         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 357             !(f->inputs[i]->out_samplerates &&
 358               f->inputs[i]->out_channel_layouts))
 359             return 0;
 360     }
 361     for (i = 0; i < f->nb_outputs; i++) {
 362         if (!f->outputs[i]->in_formats)
 363             return 0;
 364         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 365             !(f->outputs[i]->in_samplerates &&
 366               f->outputs[i]->in_channel_layouts))
 367             return 0;
 368     }
 369     return 1;
 370 }
 371
 372 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 373 {
 374     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 375     if (a) {
 376         a->refcount = 0;
 377         a->refs     = NULL;
 378         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 379         if (!a->formats && arg->formats)
 380             av_freep(&a);
 381     }
 382     return a;
 383 }
 384
 385 static int can_merge_formats(AVFilterFormats *a_arg,
 386                              AVFilterFormats *b_arg,
 387                              enum AVMediaType type,
 388                              int is_sample_rate)
 389 {
 390     AVFilterFormats *a, *b, *ret;
 391     if (a_arg == b_arg)
 392         return 1;
 393     a = clone_filter_formats(a_arg);
 394     b = clone_filter_formats(b_arg);
 395
 396     if (!a || !b) {
 397         if (a)
 398             av_freep(&a->formats);
 399         if (b)
 400             av_freep(&b->formats);
 401
 402         av_freep(&a);
 403         av_freep(&b);
 404
 405         return 0;
 406     }
 407
 408     if (is_sample_rate) {
 409         ret = ff_merge_samplerates(a, b);
 410     } else {
 411         ret = ff_merge_formats(a, b, type);
 412     }
 413     if (ret) {
 414         av_freep(&ret->formats);
 415         av_freep(&ret->refs);
 416         av_freep(&ret);
 417         return 1;
 418     } else {
 419         av_freep(&a->formats);
 420         av_freep(&b->formats);
 421         av_freep(&a);
 422         av_freep(&b);
 423         return 0;
 424     }
 425 }
 426
 427 /**
 428  * Perform one round of query_formats() and merging formats lists on the
 429  * filter graph.
 430  * @return  >=0 if all links formats lists could be queried and merged;
 431  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 432  *          and a later call may succeed;
 433  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 434  *          was made and the negotiation is stuck;
 435  *          a negative error code if some other error happened
 436  */
 437 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 438 {
 439     int i, j, ret;
 440     int scaler_count = 0, resampler_count = 0;
 441     int count_queried = 0;        /* successful calls to query_formats() */
 442     int count_merged = 0;         /* successful merge of formats lists */
 443     int count_already_merged = 0; /* lists already merged */
 444     int count_delayed = 0;        /* lists that need to be merged later */
 445
 446     for (i = 0; i < graph->nb_filters; i++) {
 447         AVFilterContext *f = graph->filters[i];
 448         if (formats_declared(f))
 449             continue;
 450         if (f->filter->query_formats)
 451             ret = filter_query_formats(f);
 452         else
 453             ret = ff_default_query_formats(f);
 454         if (ret < 0 && ret != AVERROR(EAGAIN))
 455             return ret;
 456         /* note: EAGAIN could indicate a partial success, not counted yet */
 457         count_queried += ret >= 0;
 458     }
 459
 460     /* go through and merge as many format lists as possible */
 461     for (i = 0; i < graph->nb_filters; i++) {
 462         AVFilterContext *filter = graph->filters[i];
 463
 464         for (j = 0; j < filter->nb_inputs; j++) {
 465             AVFilterLink *link = filter->inputs[j];
 466             int convert_needed = 0;
 467
 468             if (!link)
 469                 continue;
 470
 471             if (link->in_formats != link->out_formats
 472                 && link->in_formats && link->out_formats)
 473                 if (!can_merge_formats(link->in_formats, link->out_formats,
 474                                       link->type, 0))
 475                     convert_needed = 1;
 476             if (link->type == AVMEDIA_TYPE_AUDIO) {
 477                 if (link->in_samplerates != link->out_samplerates
 478                     && link->in_samplerates && link->out_samplerates)
 479                     if (!can_merge_formats(link->in_samplerates,
 480                                            link->out_samplerates,
 481                                            0, 1))
 482                         convert_needed = 1;
 483             }
 484
 485 #define MERGE_DISPATCH(field, statement)                                     \
 486             if (!(link->in_ ## field && link->out_ ## field)) {              \
 487                 count_delayed++;                                             \
 488             } else if (link->in_ ## field == link->out_ ## field) {          \
 489                 count_already_merged++;                                      \
 490             } else if (!convert_needed) {                                    \
 491                 count_merged++;                                              \
 492                 statement                                                    \
 493             }
 494
 495             if (link->type == AVMEDIA_TYPE_AUDIO) {
 496                 MERGE_DISPATCH(channel_layouts,
 497                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 498                                                   link->out_channel_layouts))
 499                         convert_needed = 1;
 500                 )
 501                 MERGE_DISPATCH(samplerates,
 502                     if (!ff_merge_samplerates(link->in_samplerates,
 503                                               link->out_samplerates))
 504                         convert_needed = 1;
 505                 )
 506             }
 507             MERGE_DISPATCH(formats,
 508                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 509                                       link->type))
 510                     convert_needed = 1;
 511             )
 512 #undef MERGE_DISPATCH
 513
 514             if (convert_needed) {
 515                 AVFilterContext *convert;
 516                 AVFilter *filter;
 517                 AVFilterLink *inlink, *outlink;
 518                 char scale_args[256];
 519                 char inst_name[30];
 520
 521                 /* couldn't merge format lists. auto-insert conversion filter */
 522                 switch (link->type) {
 523                 case AVMEDIA_TYPE_VIDEO:
 524                     if (!(filter = avfilter_get_by_name("scale"))) {
 525                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 526                                "not present, cannot convert pixel formats.\n");
 527                         return AVERROR(EINVAL);
 528                     }
 529
 530                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 531                              scaler_count++);
 532
 533                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 534                                                             inst_name, graph->scale_sws_opts, NULL,
 535                                                             graph)) < 0)
 536                         return ret;
 537                     break;
 538                 case AVMEDIA_TYPE_AUDIO:
 539                     if (!(filter = avfilter_get_by_name("aresample"))) {
 540                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 541                                "not present, cannot convert audio formats.\n");
 542                         return AVERROR(EINVAL);
 543                     }
 544
 545                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 546                              resampler_count++);
 547                     scale_args[0] = '\0';
 548                     if (graph->aresample_swr_opts)
 549                         snprintf(scale_args, sizeof(scale_args), "%s",
 550                                  graph->aresample_swr_opts);
 551                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 552                                                             inst_name, graph->aresample_swr_opts,
 553                                                             NULL, graph)) < 0)
 554                         return ret;
 555                     break;
 556                 default:
 557                     return AVERROR(EINVAL);
 558                 }
 559
 560                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 561                     return ret;
 562
 563                 filter_query_formats(convert);
 564                 inlink  = convert->inputs[0];
 565                 outlink = convert->outputs[0];
 566                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 567                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 568                     ret |= AVERROR(ENOSYS);
 569                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 570                     (!ff_merge_samplerates(inlink->in_samplerates,
 571                                            inlink->out_samplerates) ||
 572                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 573                                                inlink->out_channel_layouts)))
 574                     ret |= AVERROR(ENOSYS);
 575                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 576                     (!ff_merge_samplerates(outlink->in_samplerates,
 577                                            outlink->out_samplerates) ||
 578                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 579                                                outlink->out_channel_layouts)))
 580                     ret |= AVERROR(ENOSYS);
 581
 582                 if (ret < 0) {
 583                     av_log(log_ctx, AV_LOG_ERROR,
 584                            "Impossible to convert between the formats supported by the filter "
 585                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 586                     return ret;
 587                 }
 588             }
 589         }
 590     }
 591
 592     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 593            "%d queried, %d merged, %d already done, %d delayed\n",
 594            count_queried, count_merged, count_already_merged, count_delayed);
 595     if (count_delayed) {
 596         AVBPrint bp;
 597
 598         /* if count_queried > 0, one filter at least did set its formats,
 599            that will give additional information to its neighbour;
 600            if count_merged > 0, one pair of formats lists at least was merged,
 601            that will give additional information to all connected filters;
 602            in both cases, progress was made and a new round must be done */
 603         if (count_queried || count_merged)
 604             return AVERROR(EAGAIN);
 605         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 606         for (i = 0; i < graph->nb_filters; i++)
 607             if (!formats_declared(graph->filters[i]))
 608                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 609                           graph->filters[i]->name);
 610         av_log(graph, AV_LOG_ERROR,
 611                "The following filters could not choose their formats: %s\n"
 612                "Consider inserting the (a)format filter near their input or "
 613                "output.\n", bp.str);
 614         return AVERROR(EIO);
 615     }
 616     return 0;
 617 }
 618
 619 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 620 {
 621     if (!link || !link->in_formats)
 622         return 0;
 623
 624     if (link->type == AVMEDIA_TYPE_VIDEO) {
 625         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 626             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 627             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 628             int i;
 629             for (i=0; i<link->in_formats->nb_formats; i++) {
 630                 enum AVPixelFormat p = link->in_formats->formats[i];
 631                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 632             }
 633             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 634                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 635                    av_get_pix_fmt_name(ref->format), has_alpha);
 636             link->in_formats->formats[0] = best;
 637         }
 638     }
 639
 640     link->in_formats->nb_formats = 1;
 641     link->format = link->in_formats->formats[0];
 642
 643     if (link->type == AVMEDIA_TYPE_AUDIO) {
 644         if (!link->in_samplerates->nb_formats) {
 645             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 646                    " the link between filters %s and %s.\n", link->src->name,
 647                    link->dst->name);
 648             return AVERROR(EINVAL);
 649         }
 650         link->in_samplerates->nb_formats = 1;
 651         link->sample_rate = link->in_samplerates->formats[0];
 652
 653         if (link->in_channel_layouts->all_layouts) {
 654             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 655                    " the link between filters %s and %s.\n", link->src->name,
 656                    link->dst->name);
 657             if (!link->in_channel_layouts->all_counts)
 658                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 659                        "supported, try specifying a channel layout using "
 660                        "'aformat=channel_layouts=something'.\n");
 661             return AVERROR(EINVAL);
 662         }
 663         link->in_channel_layouts->nb_channel_layouts = 1;
 664         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 665         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 666             link->channel_layout = 0;
 667         else
 668             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 669     }
 670
 671     ff_formats_unref(&link->in_formats);
 672     ff_formats_unref(&link->out_formats);
 673     ff_formats_unref(&link->in_samplerates);
 674     ff_formats_unref(&link->out_samplerates);
 675     ff_channel_layouts_unref(&link->in_channel_layouts);
 676     ff_channel_layouts_unref(&link->out_channel_layouts);
 677
 678     return 0;
 679 }
 680
 681 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 682 do {                                                                   \
 683     for (i = 0; i < filter->nb_inputs; i++) {                          \
 684         AVFilterLink *link = filter->inputs[i];                        \
 685         fmt_type fmt;                                                  \
 686                                                                        \
 687         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 688             continue;                                                  \
 689         fmt = link->out_ ## list->var[0];                              \
 690                                                                        \
 691         for (j = 0; j < filter->nb_outputs; j++) {                     \
 692             AVFilterLink *out_link = filter->outputs[j];               \
 693             list_type *fmts;                                           \
 694                                                                        \
 695             if (link->type != out_link->type ||                        \
 696                 out_link->in_ ## list->nb == 1)                        \
 697                 continue;                                              \
 698             fmts = out_link->in_ ## list;                              \
 699                                                                        \
 700             if (!out_link->in_ ## list->nb) {                          \
 701                 add_format(&out_link->in_ ##list, fmt);                \
 702                 ret = 1;                                               \
 703                 break;                                                 \
 704             }                                                          \
 705                                                                        \
 706             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 707                 if (fmts->var[k] == fmt) {                             \
 708                     fmts->var[0]  = fmt;                               \
 709                     fmts->nb = 1;                                      \
 710                     ret = 1;                                           \
 711                     break;                                             \
 712                 }                                                      \
 713         }                                                              \
 714     }                                                                  \
 715 } while (0)
 716
 717 static int reduce_formats_on_filter(AVFilterContext *filter)
 718 {
 719     int i, j, k, ret = 0;
 720
 721     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 722                    nb_formats, ff_add_format);
 723     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 724                    nb_formats, ff_add_format);
 725
 726     /* reduce channel layouts */
 727     for (i = 0; i < filter->nb_inputs; i++) {
 728         AVFilterLink *inlink = filter->inputs[i];
 729         uint64_t fmt;
 730
 731         if (!inlink->out_channel_layouts ||
 732             inlink->out_channel_layouts->nb_channel_layouts != 1)
 733             continue;
 734         fmt = inlink->out_channel_layouts->channel_layouts[0];
 735
 736         for (j = 0; j < filter->nb_outputs; j++) {
 737             AVFilterLink *outlink = filter->outputs[j];
 738             AVFilterChannelLayouts *fmts;
 739
 740             fmts = outlink->in_channel_layouts;
 741             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 742                 continue;
 743
 744             if (fmts->all_layouts &&
 745                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 746                 /* Turn the infinite list into a singleton */
 747                 fmts->all_layouts = fmts->all_counts  = 0;
 748                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 749                 break;
 750             }
 751
 752             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 753                 if (fmts->channel_layouts[k] == fmt) {
 754                     fmts->channel_layouts[0]  = fmt;
 755                     fmts->nb_channel_layouts = 1;
 756                     ret = 1;
 757                     break;
 758                 }
 759             }
 760         }
 761     }
 762
 763     return ret;
 764 }
 765
 766 static void reduce_formats(AVFilterGraph *graph)
 767 {
 768     int i, reduced;
 769
 770     do {
 771         reduced = 0;
 772
 773         for (i = 0; i < graph->nb_filters; i++)
 774             reduced |= reduce_formats_on_filter(graph->filters[i]);
 775     } while (reduced);
 776 }
 777
 778 static void swap_samplerates_on_filter(AVFilterContext *filter)
 779 {
 780     AVFilterLink *link = NULL;
 781     int sample_rate;
 782     int i, j;
 783
 784     for (i = 0; i < filter->nb_inputs; i++) {
 785         link = filter->inputs[i];
 786
 787         if (link->type == AVMEDIA_TYPE_AUDIO &&
 788             link->out_samplerates->nb_formats== 1)
 789             break;
 790     }
 791     if (i == filter->nb_inputs)
 792         return;
 793
 794     sample_rate = link->out_samplerates->formats[0];
 795
 796     for (i = 0; i < filter->nb_outputs; i++) {
 797         AVFilterLink *outlink = filter->outputs[i];
 798         int best_idx, best_diff = INT_MAX;
 799
 800         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 801             outlink->in_samplerates->nb_formats < 2)
 802             continue;
 803
 804         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 805             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 806
 807             if (diff < best_diff) {
 808                 best_diff = diff;
 809                 best_idx  = j;
 810             }
 811         }
 812         FFSWAP(int, outlink->in_samplerates->formats[0],
 813                outlink->in_samplerates->formats[best_idx]);
 814     }
 815 }
 816
 817 static void swap_samplerates(AVFilterGraph *graph)
 818 {
 819     int i;
 820
 821     for (i = 0; i < graph->nb_filters; i++)
 822         swap_samplerates_on_filter(graph->filters[i]);
 823 }
 824
 825 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 826 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 827 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 828 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 829 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 830 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 831 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 832
 833 /* allowable substitutions for channel pairs when comparing layouts,
 834  * ordered by priority for both values */
 835 static const uint64_t ch_subst[][2] = {
 836     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 837     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 838     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 839     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 840     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 841     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 842     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 843     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 844     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 845     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 846     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 847     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 848     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 849     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 850     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 851     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 852     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 853     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 854     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 855     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 856     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 857 };
 858
 859 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 860 {
 861     AVFilterLink *link = NULL;
 862     int i, j, k;
 863
 864     for (i = 0; i < filter->nb_inputs; i++) {
 865         link = filter->inputs[i];
 866
 867         if (link->type == AVMEDIA_TYPE_AUDIO &&
 868             link->out_channel_layouts->nb_channel_layouts == 1)
 869             break;
 870     }
 871     if (i == filter->nb_inputs)
 872         return;
 873
 874     for (i = 0; i < filter->nb_outputs; i++) {
 875         AVFilterLink *outlink = filter->outputs[i];
 876         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 877
 878         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 879             outlink->in_channel_layouts->nb_channel_layouts < 2)
 880             continue;
 881
 882         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 883             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 884             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 885             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 886             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 887             int count_diff        = out_channels - in_channels;
 888             int matched_channels, extra_channels;
 889             int score = 100000;
 890
 891             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 892                 /* Compute score in case the input or output layout encodes
 893                    a channel count; in this case the score is not altered by
 894                    the computation afterwards, as in_chlayout and
 895                    out_chlayout have both been set to 0 */
 896                 if (FF_LAYOUT2COUNT(in_chlayout))
 897                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 898                 if (FF_LAYOUT2COUNT(out_chlayout))
 899                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 900                 score -= 10000 + FFABS(out_channels - in_channels) +
 901                          (in_channels > out_channels ? 10000 : 0);
 902                 in_chlayout = out_chlayout = 0;
 903                 /* Let the remaining computation run, even if the score
 904                    value is not altered */
 905             }
 906
 907             /* channel substitution */
 908             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 909                 uint64_t cmp0 = ch_subst[k][0];
 910                 uint64_t cmp1 = ch_subst[k][1];
 911                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 912                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 913                     in_chlayout  &= ~cmp0;
 914                     out_chlayout &= ~cmp1;
 915                     /* add score for channel match, minus a deduction for
 916                        having to do the substitution */
 917                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 918                 }
 919             }
 920
 921             /* no penalty for LFE channel mismatch */
 922             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 923                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 924                 score += 10;
 925             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 926             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 927
 928             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 929                                                                  out_chlayout);
 930             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 931                                                                  (~in_chlayout));
 932             score += 10 * matched_channels - 5 * extra_channels;
 933
 934             if (score > best_score ||
 935                 (count_diff < best_count_diff && score == best_score)) {
 936                 best_score = score;
 937                 best_idx   = j;
 938                 best_count_diff = count_diff;
 939             }
 940         }
 941         av_assert0(best_idx >= 0);
 942         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 943                outlink->in_channel_layouts->channel_layouts[best_idx]);
 944     }
 945
 946 }
 947
 948 static void swap_channel_layouts(AVFilterGraph *graph)
 949 {
 950     int i;
 951
 952     for (i = 0; i < graph->nb_filters; i++)
 953         swap_channel_layouts_on_filter(graph->filters[i]);
 954 }
 955
 956 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 957 {
 958     AVFilterLink *link = NULL;
 959     int format, bps;
 960     int i, j;
 961
 962     for (i = 0; i < filter->nb_inputs; i++) {
 963         link = filter->inputs[i];
 964
 965         if (link->type == AVMEDIA_TYPE_AUDIO &&
 966             link->out_formats->nb_formats == 1)
 967             break;
 968     }
 969     if (i == filter->nb_inputs)
 970         return;
 971
 972     format = link->out_formats->formats[0];
 973     bps    = av_get_bytes_per_sample(format);
 974
 975     for (i = 0; i < filter->nb_outputs; i++) {
 976         AVFilterLink *outlink = filter->outputs[i];
 977         int best_idx = -1, best_score = INT_MIN;
 978
 979         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 980             outlink->in_formats->nb_formats < 2)
 981             continue;
 982
 983         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
 984             int out_format = outlink->in_formats->formats[j];
 985             int out_bps    = av_get_bytes_per_sample(out_format);
 986             int score;
 987
 988             if (av_get_packed_sample_fmt(out_format) == format ||
 989                 av_get_planar_sample_fmt(out_format) == format) {
 990                 best_idx   = j;
 991                 break;
 992             }
 993
 994             /* for s32 and float prefer double to prevent loss of information */
 995             if (bps == 4 && out_bps == 8) {
 996                 best_idx = j;
 997                 break;
 998             }
 999
1000             /* prefer closest higher or equal bps */
1001             score = -abs(out_bps - bps);
1002             if (out_bps >= bps)
1003                 score += INT_MAX/2;
1004
1005             if (score > best_score) {
1006                 best_score = score;
1007                 best_idx   = j;
1008             }
1009         }
1010         av_assert0(best_idx >= 0);
1011         FFSWAP(int, outlink->in_formats->formats[0],
1012                outlink->in_formats->formats[best_idx]);
1013     }
1014 }
1015
1016 static void swap_sample_fmts(AVFilterGraph *graph)
1017 {
1018     int i;
1019
1020     for (i = 0; i < graph->nb_filters; i++)
1021         swap_sample_fmts_on_filter(graph->filters[i]);
1022
1023 }
1024
1025 static int pick_formats(AVFilterGraph *graph)
1026 {
1027     int i, j, ret;
1028     int change;
1029
1030     do{
1031         change = 0;
1032         for (i = 0; i < graph->nb_filters; i++) {
1033             AVFilterContext *filter = graph->filters[i];
1034             if (filter->nb_inputs){
1035                 for (j = 0; j < filter->nb_inputs; j++){
1036                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1037                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1038                             return ret;
1039                         change = 1;
1040                     }
1041                 }
1042             }
1043             if (filter->nb_outputs){
1044                 for (j = 0; j < filter->nb_outputs; j++){
1045                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1046                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1047                             return ret;
1048                         change = 1;
1049                     }
1050                 }
1051             }
1052             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1053                 for (j = 0; j < filter->nb_outputs; j++) {
1054                     if(filter->outputs[j]->format<0) {
1055                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1056                             return ret;
1057                         change = 1;
1058                     }
1059                 }
1060             }
1061         }
1062     }while(change);
1063
1064     for (i = 0; i < graph->nb_filters; i++) {
1065         AVFilterContext *filter = graph->filters[i];
1066
1067         for (j = 0; j < filter->nb_inputs; j++)
1068             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1069                 return ret;
1070         for (j = 0; j < filter->nb_outputs; j++)
1071             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1072                 return ret;
1073     }
1074     return 0;
1075 }
1076
1077 /**
1078  * Configure the formats of all the links in the graph.
1079  */
1080 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1081 {
1082     int ret;
1083
1084     /* find supported formats from sub-filters, and merge along links */
1085     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1086         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1087     if (ret < 0)
1088         return ret;
1089
1090     /* Once everything is merged, it's possible that we'll still have
1091      * multiple valid media format choices. We try to minimize the amount
1092      * of format conversion inside filters */
1093     reduce_formats(graph);
1094
1095     /* for audio filters, ensure the best format, sample rate and channel layout
1096      * is selected */
1097     swap_sample_fmts(graph);
1098     swap_samplerates(graph);
1099     swap_channel_layouts(graph);
1100
1101     if ((ret = pick_formats(graph)) < 0)
1102         return ret;
1103
1104     return 0;
1105 }
1106
1107 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
1108                                              AVClass *log_ctx)
1109 {
1110     unsigned i, j;
1111     int sink_links_count = 0, n = 0;
1112     AVFilterContext *f;
1113     AVFilterLink **sinks;
1114
1115     for (i = 0; i < graph->nb_filters; i++) {
1116         f = graph->filters[i];
1117         for (j = 0; j < f->nb_inputs; j++) {
1118             f->inputs[j]->graph     = graph;
1119             f->inputs[j]->age_index = -1;
1120         }
1121         for (j = 0; j < f->nb_outputs; j++) {
1122             f->outputs[j]->graph    = graph;
1123             f->outputs[j]->age_index= -1;
1124         }
1125         if (!f->nb_outputs) {
1126             if (f->nb_inputs > INT_MAX - sink_links_count)
1127                 return AVERROR(EINVAL);
1128             sink_links_count += f->nb_inputs;
1129         }
1130     }
1131     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1132     if (!sinks)
1133         return AVERROR(ENOMEM);
1134     for (i = 0; i < graph->nb_filters; i++) {
1135         f = graph->filters[i];
1136         if (!f->nb_outputs) {
1137             for (j = 0; j < f->nb_inputs; j++) {
1138                 sinks[n] = f->inputs[j];
1139                 f->inputs[j]->age_index = n++;
1140             }
1141         }
1142     }
1143     av_assert0(n == sink_links_count);
1144     graph->sink_links       = sinks;
1145     graph->sink_links_count = sink_links_count;
1146     return 0;
1147 }
1148
1149 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1150 {
1151     AVFilterContext *f;
1152     int i, j, ret;
1153     int fifo_count = 0;
1154
1155     for (i = 0; i < graph->nb_filters; i++) {
1156         f = graph->filters[i];
1157
1158         for (j = 0; j < f->nb_inputs; j++) {
1159             AVFilterLink *link = f->inputs[j];
1160             AVFilterContext *fifo_ctx;
1161             AVFilter *fifo;
1162             char name[32];
1163
1164             if (!link->dstpad->needs_fifo)
1165                 continue;
1166
1167             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1168                    avfilter_get_by_name("fifo") :
1169                    avfilter_get_by_name("afifo");
1170
1171             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1172
1173             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1174                                                NULL, graph);
1175             if (ret < 0)
1176                 return ret;
1177
1178             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1179             if (ret < 0)
1180                 return ret;
1181         }
1182     }
1183
1184     return 0;
1185 }
1186
1187 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1188 {
1189     int ret;
1190
1191     if ((ret = graph_check_validity(graphctx, log_ctx)))
1192         return ret;
1193     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1194         return ret;
1195     if ((ret = graph_config_formats(graphctx, log_ctx)))
1196         return ret;
1197     if ((ret = graph_config_links(graphctx, log_ctx)))
1198         return ret;
1199     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1200         return ret;
1201
1202     return 0;
1203 }
1204
1205 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1206 {
1207     int i, r = AVERROR(ENOSYS);
1208
1209     if (!graph)
1210         return r;
1211
1212     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1213         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1214         if (r != AVERROR(ENOSYS))
1215             return r;
1216     }
1217
1218     if (res_len && res)
1219         res[0] = 0;
1220
1221     for (i = 0; i < graph->nb_filters; i++) {
1222         AVFilterContext *filter = graph->filters[i];
1223         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1224             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1225             if (r != AVERROR(ENOSYS)) {
1226                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1227                     return r;
1228             }
1229         }
1230     }
1231
1232     return r;
1233 }
1234
1235 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1236 {
1237     int i;
1238
1239     if(!graph)
1240         return 0;
1241
1242     for (i = 0; i < graph->nb_filters; i++) {
1243         AVFilterContext *filter = graph->filters[i];
1244         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1245             AVFilterCommand **queue = &filter->command_queue, *next;
1246             while (*queue && (*queue)->time <= ts)
1247                 queue = &(*queue)->next;
1248             next = *queue;
1249             *queue = av_mallocz(sizeof(AVFilterCommand));
1250             (*queue)->command = av_strdup(command);
1251             (*queue)->arg     = av_strdup(arg);
1252             (*queue)->time    = ts;
1253             (*queue)->flags   = flags;
1254             (*queue)->next    = next;
1255             if(flags & AVFILTER_CMD_FLAG_ONE)
1256                 return 0;
1257         }
1258     }
1259
1260     return 0;
1261 }
1262
1263 static void heap_bubble_up(AVFilterGraph *graph,
1264                            AVFilterLink *link, int index)
1265 {
1266     AVFilterLink **links = graph->sink_links;
1267
1268     while (index) {
1269         int parent = (index - 1) >> 1;
1270         if (links[parent]->current_pts >= link->current_pts)
1271             break;
1272         links[index] = links[parent];
1273         links[index]->age_index = index;
1274         index = parent;
1275     }
1276     links[index] = link;
1277     link->age_index = index;
1278 }
1279
1280 static void heap_bubble_down(AVFilterGraph *graph,
1281                              AVFilterLink *link, int index)
1282 {
1283     AVFilterLink **links = graph->sink_links;
1284
1285     while (1) {
1286         int child = 2 * index + 1;
1287         if (child >= graph->sink_links_count)
1288             break;
1289         if (child + 1 < graph->sink_links_count &&
1290             links[child + 1]->current_pts < links[child]->current_pts)
1291             child++;
1292         if (link->current_pts < links[child]->current_pts)
1293             break;
1294         links[index] = links[child];
1295         links[index]->age_index = index;
1296         index = child;
1297     }
1298     links[index] = link;
1299     link->age_index = index;
1300 }
1301
1302 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1303 {
1304     heap_bubble_up  (graph, link, link->age_index);
1305     heap_bubble_down(graph, link, link->age_index);
1306 }
1307
1308
1309 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1310 {
1311     while (graph->sink_links_count) {
1312         AVFilterLink *oldest = graph->sink_links[0];
1313         int r = ff_request_frame(oldest);
1314         if (r != AVERROR_EOF)
1315             return r;
1316         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1317                oldest->dst ? oldest->dst->name : "unknown",
1318                oldest->dstpad ? oldest->dstpad->name : "unknown");
1319         /* EOF: remove the link from the heap */
1320         if (oldest->age_index < --graph->sink_links_count)
1321             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1322                              oldest->age_index);
1323         oldest->age_index = -1;
1324     }
1325     return AVERROR_EOF;
1326 }