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             return AVERROR(EINVAL);
 658         }
 659         link->in_channel_layouts->nb_channel_layouts = 1;
 660         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 661         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 662             link->channel_layout = 0;
 663         else
 664             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 665     }
 666
 667     ff_formats_unref(&link->in_formats);
 668     ff_formats_unref(&link->out_formats);
 669     ff_formats_unref(&link->in_samplerates);
 670     ff_formats_unref(&link->out_samplerates);
 671     ff_channel_layouts_unref(&link->in_channel_layouts);
 672     ff_channel_layouts_unref(&link->out_channel_layouts);
 673
 674     return 0;
 675 }
 676
 677 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 678 do {                                                                   \
 679     for (i = 0; i < filter->nb_inputs; i++) {                          \
 680         AVFilterLink *link = filter->inputs[i];                        \
 681         fmt_type fmt;                                                  \
 682                                                                        \
 683         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 684             continue;                                                  \
 685         fmt = link->out_ ## list->var[0];                              \
 686                                                                        \
 687         for (j = 0; j < filter->nb_outputs; j++) {                     \
 688             AVFilterLink *out_link = filter->outputs[j];               \
 689             list_type *fmts;                                           \
 690                                                                        \
 691             if (link->type != out_link->type ||                        \
 692                 out_link->in_ ## list->nb == 1)                        \
 693                 continue;                                              \
 694             fmts = out_link->in_ ## list;                              \
 695                                                                        \
 696             if (!out_link->in_ ## list->nb) {                          \
 697                 add_format(&out_link->in_ ##list, fmt);                \
 698                 ret = 1;                                               \
 699                 break;                                                 \
 700             }                                                          \
 701                                                                        \
 702             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 703                 if (fmts->var[k] == fmt) {                             \
 704                     fmts->var[0]  = fmt;                               \
 705                     fmts->nb = 1;                                      \
 706                     ret = 1;                                           \
 707                     break;                                             \
 708                 }                                                      \
 709         }                                                              \
 710     }                                                                  \
 711 } while (0)
 712
 713 static int reduce_formats_on_filter(AVFilterContext *filter)
 714 {
 715     int i, j, k, ret = 0;
 716
 717     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 718                    nb_formats, ff_add_format);
 719     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 720                    nb_formats, ff_add_format);
 721
 722     /* reduce channel layouts */
 723     for (i = 0; i < filter->nb_inputs; i++) {
 724         AVFilterLink *inlink = filter->inputs[i];
 725         uint64_t fmt;
 726
 727         if (!inlink->out_channel_layouts ||
 728             inlink->out_channel_layouts->nb_channel_layouts != 1)
 729             continue;
 730         fmt = inlink->out_channel_layouts->channel_layouts[0];
 731
 732         for (j = 0; j < filter->nb_outputs; j++) {
 733             AVFilterLink *outlink = filter->outputs[j];
 734             AVFilterChannelLayouts *fmts;
 735
 736             fmts = outlink->in_channel_layouts;
 737             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 738                 continue;
 739
 740             if (fmts->all_layouts) {
 741                 /* Turn the infinite list into a singleton */
 742                 fmts->all_layouts = fmts->all_counts  = 0;
 743                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 744                 break;
 745             }
 746
 747             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 748                 if (fmts->channel_layouts[k] == fmt) {
 749                     fmts->channel_layouts[0]  = fmt;
 750                     fmts->nb_channel_layouts = 1;
 751                     ret = 1;
 752                     break;
 753                 }
 754             }
 755         }
 756     }
 757
 758     return ret;
 759 }
 760
 761 static void reduce_formats(AVFilterGraph *graph)
 762 {
 763     int i, reduced;
 764
 765     do {
 766         reduced = 0;
 767
 768         for (i = 0; i < graph->nb_filters; i++)
 769             reduced |= reduce_formats_on_filter(graph->filters[i]);
 770     } while (reduced);
 771 }
 772
 773 static void swap_samplerates_on_filter(AVFilterContext *filter)
 774 {
 775     AVFilterLink *link = NULL;
 776     int sample_rate;
 777     int i, j;
 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_samplerates->nb_formats== 1)
 784             break;
 785     }
 786     if (i == filter->nb_inputs)
 787         return;
 788
 789     sample_rate = link->out_samplerates->formats[0];
 790
 791     for (i = 0; i < filter->nb_outputs; i++) {
 792         AVFilterLink *outlink = filter->outputs[i];
 793         int best_idx, best_diff = INT_MAX;
 794
 795         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 796             outlink->in_samplerates->nb_formats < 2)
 797             continue;
 798
 799         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 800             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 801
 802             if (diff < best_diff) {
 803                 best_diff = diff;
 804                 best_idx  = j;
 805             }
 806         }
 807         FFSWAP(int, outlink->in_samplerates->formats[0],
 808                outlink->in_samplerates->formats[best_idx]);
 809     }
 810 }
 811
 812 static void swap_samplerates(AVFilterGraph *graph)
 813 {
 814     int i;
 815
 816     for (i = 0; i < graph->nb_filters; i++)
 817         swap_samplerates_on_filter(graph->filters[i]);
 818 }
 819
 820 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 821 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 822 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 823 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 824 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 825 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 826 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 827
 828 /* allowable substitutions for channel pairs when comparing layouts,
 829  * ordered by priority for both values */
 830 static const uint64_t ch_subst[][2] = {
 831     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 832     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 833     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 834     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 835     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 836     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 837     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 838     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 839     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 840     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 841     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 842     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 843     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 844     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 845     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 846     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 847     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 848     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 849     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 850     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 851     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 852 };
 853
 854 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 855 {
 856     AVFilterLink *link = NULL;
 857     int i, j, k;
 858
 859     for (i = 0; i < filter->nb_inputs; i++) {
 860         link = filter->inputs[i];
 861
 862         if (link->type == AVMEDIA_TYPE_AUDIO &&
 863             link->out_channel_layouts->nb_channel_layouts == 1)
 864             break;
 865     }
 866     if (i == filter->nb_inputs)
 867         return;
 868
 869     for (i = 0; i < filter->nb_outputs; i++) {
 870         AVFilterLink *outlink = filter->outputs[i];
 871         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 872
 873         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 874             outlink->in_channel_layouts->nb_channel_layouts < 2)
 875             continue;
 876
 877         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 878             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 879             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 880             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 881             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 882             int count_diff        = out_channels - in_channels;
 883             int matched_channels, extra_channels;
 884             int score = 100000;
 885
 886             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 887                 /* Compute score in case the input or output layout encodes
 888                    a channel count; in this case the score is not altered by
 889                    the computation afterwards, as in_chlayout and
 890                    out_chlayout have both been set to 0 */
 891                 if (FF_LAYOUT2COUNT(in_chlayout))
 892                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 893                 if (FF_LAYOUT2COUNT(out_chlayout))
 894                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 895                 score -= 10000 + FFABS(out_channels - in_channels) +
 896                          (in_channels > out_channels ? 10000 : 0);
 897                 in_chlayout = out_chlayout = 0;
 898                 /* Let the remaining computation run, even if the score
 899                    value is not altered */
 900             }
 901
 902             /* channel substitution */
 903             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 904                 uint64_t cmp0 = ch_subst[k][0];
 905                 uint64_t cmp1 = ch_subst[k][1];
 906                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 907                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 908                     in_chlayout  &= ~cmp0;
 909                     out_chlayout &= ~cmp1;
 910                     /* add score for channel match, minus a deduction for
 911                        having to do the substitution */
 912                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 913                 }
 914             }
 915
 916             /* no penalty for LFE channel mismatch */
 917             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 918                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 919                 score += 10;
 920             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 921             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 922
 923             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 924                                                                  out_chlayout);
 925             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 926                                                                  (~in_chlayout));
 927             score += 10 * matched_channels - 5 * extra_channels;
 928
 929             if (score > best_score ||
 930                 (count_diff < best_count_diff && score == best_score)) {
 931                 best_score = score;
 932                 best_idx   = j;
 933                 best_count_diff = count_diff;
 934             }
 935         }
 936         av_assert0(best_idx >= 0);
 937         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 938                outlink->in_channel_layouts->channel_layouts[best_idx]);
 939     }
 940
 941 }
 942
 943 static void swap_channel_layouts(AVFilterGraph *graph)
 944 {
 945     int i;
 946
 947     for (i = 0; i < graph->nb_filters; i++)
 948         swap_channel_layouts_on_filter(graph->filters[i]);
 949 }
 950
 951 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 952 {
 953     AVFilterLink *link = NULL;
 954     int format, bps;
 955     int i, j;
 956
 957     for (i = 0; i < filter->nb_inputs; i++) {
 958         link = filter->inputs[i];
 959
 960         if (link->type == AVMEDIA_TYPE_AUDIO &&
 961             link->out_formats->nb_formats == 1)
 962             break;
 963     }
 964     if (i == filter->nb_inputs)
 965         return;
 966
 967     format = link->out_formats->formats[0];
 968     bps    = av_get_bytes_per_sample(format);
 969
 970     for (i = 0; i < filter->nb_outputs; i++) {
 971         AVFilterLink *outlink = filter->outputs[i];
 972         int best_idx = -1, best_score = INT_MIN;
 973
 974         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 975             outlink->in_formats->nb_formats < 2)
 976             continue;
 977
 978         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
 979             int out_format = outlink->in_formats->formats[j];
 980             int out_bps    = av_get_bytes_per_sample(out_format);
 981             int score;
 982
 983             if (av_get_packed_sample_fmt(out_format) == format ||
 984                 av_get_planar_sample_fmt(out_format) == format) {
 985                 best_idx   = j;
 986                 break;
 987             }
 988
 989             /* for s32 and float prefer double to prevent loss of information */
 990             if (bps == 4 && out_bps == 8) {
 991                 best_idx = j;
 992                 break;
 993             }
 994
 995             /* prefer closest higher or equal bps */
 996             score = -abs(out_bps - bps);
 997             if (out_bps >= bps)
 998                 score += INT_MAX/2;
 999
1000             if (score > best_score) {
1001                 best_score = score;
1002                 best_idx   = j;
1003             }
1004         }
1005         av_assert0(best_idx >= 0);
1006         FFSWAP(int, outlink->in_formats->formats[0],
1007                outlink->in_formats->formats[best_idx]);
1008     }
1009 }
1010
1011 static void swap_sample_fmts(AVFilterGraph *graph)
1012 {
1013     int i;
1014
1015     for (i = 0; i < graph->nb_filters; i++)
1016         swap_sample_fmts_on_filter(graph->filters[i]);
1017
1018 }
1019
1020 static int pick_formats(AVFilterGraph *graph)
1021 {
1022     int i, j, ret;
1023     int change;
1024
1025     do{
1026         change = 0;
1027         for (i = 0; i < graph->nb_filters; i++) {
1028             AVFilterContext *filter = graph->filters[i];
1029             if (filter->nb_inputs){
1030                 for (j = 0; j < filter->nb_inputs; j++){
1031                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1032                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1033                             return ret;
1034                         change = 1;
1035                     }
1036                 }
1037             }
1038             if (filter->nb_outputs){
1039                 for (j = 0; j < filter->nb_outputs; j++){
1040                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1041                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1042                             return ret;
1043                         change = 1;
1044                     }
1045                 }
1046             }
1047             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1048                 for (j = 0; j < filter->nb_outputs; j++) {
1049                     if(filter->outputs[j]->format<0) {
1050                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1051                             return ret;
1052                         change = 1;
1053                     }
1054                 }
1055             }
1056         }
1057     }while(change);
1058
1059     for (i = 0; i < graph->nb_filters; i++) {
1060         AVFilterContext *filter = graph->filters[i];
1061
1062         for (j = 0; j < filter->nb_inputs; j++)
1063             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1064                 return ret;
1065         for (j = 0; j < filter->nb_outputs; j++)
1066             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1067                 return ret;
1068     }
1069     return 0;
1070 }
1071
1072 /**
1073  * Configure the formats of all the links in the graph.
1074  */
1075 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1076 {
1077     int ret;
1078
1079     /* find supported formats from sub-filters, and merge along links */
1080     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1081         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1082     if (ret < 0)
1083         return ret;
1084
1085     /* Once everything is merged, it's possible that we'll still have
1086      * multiple valid media format choices. We try to minimize the amount
1087      * of format conversion inside filters */
1088     reduce_formats(graph);
1089
1090     /* for audio filters, ensure the best format, sample rate and channel layout
1091      * is selected */
1092     swap_sample_fmts(graph);
1093     swap_samplerates(graph);
1094     swap_channel_layouts(graph);
1095
1096     if ((ret = pick_formats(graph)) < 0)
1097         return ret;
1098
1099     return 0;
1100 }
1101
1102 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
1103                                              AVClass *log_ctx)
1104 {
1105     unsigned i, j;
1106     int sink_links_count = 0, n = 0;
1107     AVFilterContext *f;
1108     AVFilterLink **sinks;
1109
1110     for (i = 0; i < graph->nb_filters; i++) {
1111         f = graph->filters[i];
1112         for (j = 0; j < f->nb_inputs; j++) {
1113             f->inputs[j]->graph     = graph;
1114             f->inputs[j]->age_index = -1;
1115         }
1116         for (j = 0; j < f->nb_outputs; j++) {
1117             f->outputs[j]->graph    = graph;
1118             f->outputs[j]->age_index= -1;
1119         }
1120         if (!f->nb_outputs) {
1121             if (f->nb_inputs > INT_MAX - sink_links_count)
1122                 return AVERROR(EINVAL);
1123             sink_links_count += f->nb_inputs;
1124         }
1125     }
1126     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1127     if (!sinks)
1128         return AVERROR(ENOMEM);
1129     for (i = 0; i < graph->nb_filters; i++) {
1130         f = graph->filters[i];
1131         if (!f->nb_outputs) {
1132             for (j = 0; j < f->nb_inputs; j++) {
1133                 sinks[n] = f->inputs[j];
1134                 f->inputs[j]->age_index = n++;
1135             }
1136         }
1137     }
1138     av_assert0(n == sink_links_count);
1139     graph->sink_links       = sinks;
1140     graph->sink_links_count = sink_links_count;
1141     return 0;
1142 }
1143
1144 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1145 {
1146     AVFilterContext *f;
1147     int i, j, ret;
1148     int fifo_count = 0;
1149
1150     for (i = 0; i < graph->nb_filters; i++) {
1151         f = graph->filters[i];
1152
1153         for (j = 0; j < f->nb_inputs; j++) {
1154             AVFilterLink *link = f->inputs[j];
1155             AVFilterContext *fifo_ctx;
1156             AVFilter *fifo;
1157             char name[32];
1158
1159             if (!link->dstpad->needs_fifo)
1160                 continue;
1161
1162             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1163                    avfilter_get_by_name("fifo") :
1164                    avfilter_get_by_name("afifo");
1165
1166             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1167
1168             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1169                                                NULL, graph);
1170             if (ret < 0)
1171                 return ret;
1172
1173             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1174             if (ret < 0)
1175                 return ret;
1176         }
1177     }
1178
1179     return 0;
1180 }
1181
1182 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1183 {
1184     int ret;
1185
1186     if ((ret = graph_check_validity(graphctx, log_ctx)))
1187         return ret;
1188     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1189         return ret;
1190     if ((ret = graph_config_formats(graphctx, log_ctx)))
1191         return ret;
1192     if ((ret = graph_config_links(graphctx, log_ctx)))
1193         return ret;
1194     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1195         return ret;
1196
1197     return 0;
1198 }
1199
1200 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1201 {
1202     int i, r = AVERROR(ENOSYS);
1203
1204     if (!graph)
1205         return r;
1206
1207     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1208         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1209         if (r != AVERROR(ENOSYS))
1210             return r;
1211     }
1212
1213     if (res_len && res)
1214         res[0] = 0;
1215
1216     for (i = 0; i < graph->nb_filters; i++) {
1217         AVFilterContext *filter = graph->filters[i];
1218         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1219             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1220             if (r != AVERROR(ENOSYS)) {
1221                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1222                     return r;
1223             }
1224         }
1225     }
1226
1227     return r;
1228 }
1229
1230 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1231 {
1232     int i;
1233
1234     if(!graph)
1235         return 0;
1236
1237     for (i = 0; i < graph->nb_filters; i++) {
1238         AVFilterContext *filter = graph->filters[i];
1239         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1240             AVFilterCommand **queue = &filter->command_queue, *next;
1241             while (*queue && (*queue)->time <= ts)
1242                 queue = &(*queue)->next;
1243             next = *queue;
1244             *queue = av_mallocz(sizeof(AVFilterCommand));
1245             (*queue)->command = av_strdup(command);
1246             (*queue)->arg     = av_strdup(arg);
1247             (*queue)->time    = ts;
1248             (*queue)->flags   = flags;
1249             (*queue)->next    = next;
1250             if(flags & AVFILTER_CMD_FLAG_ONE)
1251                 return 0;
1252         }
1253     }
1254
1255     return 0;
1256 }
1257
1258 static void heap_bubble_up(AVFilterGraph *graph,
1259                            AVFilterLink *link, int index)
1260 {
1261     AVFilterLink **links = graph->sink_links;
1262
1263     while (index) {
1264         int parent = (index - 1) >> 1;
1265         if (links[parent]->current_pts >= link->current_pts)
1266             break;
1267         links[index] = links[parent];
1268         links[index]->age_index = index;
1269         index = parent;
1270     }
1271     links[index] = link;
1272     link->age_index = index;
1273 }
1274
1275 static void heap_bubble_down(AVFilterGraph *graph,
1276                              AVFilterLink *link, int index)
1277 {
1278     AVFilterLink **links = graph->sink_links;
1279
1280     while (1) {
1281         int child = 2 * index + 1;
1282         if (child >= graph->sink_links_count)
1283             break;
1284         if (child + 1 < graph->sink_links_count &&
1285             links[child + 1]->current_pts < links[child]->current_pts)
1286             child++;
1287         if (link->current_pts < links[child]->current_pts)
1288             break;
1289         links[index] = links[child];
1290         links[index]->age_index = index;
1291         index = child;
1292     }
1293     links[index] = link;
1294     link->age_index = index;
1295 }
1296
1297 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1298 {
1299     heap_bubble_up  (graph, link, link->age_index);
1300     heap_bubble_down(graph, link, link->age_index);
1301 }
1302
1303
1304 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1305 {
1306     while (graph->sink_links_count) {
1307         AVFilterLink *oldest = graph->sink_links[0];
1308         int r = ff_request_frame(oldest);
1309         if (r != AVERROR_EOF)
1310             return r;
1311         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1312                oldest->dst ? oldest->dst->name : "unknown",
1313                oldest->dstpad ? oldest->dstpad->name : "unknown");
1314         /* EOF: remove the link from the heap */
1315         if (oldest->age_index < --graph->sink_links_count)
1316             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1317                              oldest->age_index);
1318         oldest->age_index = -1;
1319     }
1320     return AVERROR_EOF;
1321 }