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     if (is_sample_rate) {
 396         ret = ff_merge_samplerates(a, b);
 397     } else {
 398         ret = ff_merge_formats(a, b, type);
 399     }
 400     if (ret) {
 401         av_freep(&ret->formats);
 402         av_freep(&ret->refs);
 403         av_freep(&ret);
 404         return 1;
 405     } else {
 406         av_freep(&a->formats);
 407         av_freep(&b->formats);
 408         av_freep(&a);
 409         av_freep(&b);
 410         return 0;
 411     }
 412 }
 413
 414 /**
 415  * Perform one round of query_formats() and merging formats lists on the
 416  * filter graph.
 417  * @return  >=0 if all links formats lists could be queried and merged;
 418  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 419  *          and a later call may succeed;
 420  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 421  *          was made and the negotiation is stuck;
 422  *          a negative error code if some other error happened
 423  */
 424 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 425 {
 426     int i, j, ret;
 427     int scaler_count = 0, resampler_count = 0;
 428     int count_queried = 0;        /* successful calls to query_formats() */
 429     int count_merged = 0;         /* successful merge of formats lists */
 430     int count_already_merged = 0; /* lists already merged */
 431     int count_delayed = 0;        /* lists that need to be merged later */
 432
 433     for (i = 0; i < graph->nb_filters; i++) {
 434         AVFilterContext *f = graph->filters[i];
 435         if (formats_declared(f))
 436             continue;
 437         if (f->filter->query_formats)
 438             ret = filter_query_formats(f);
 439         else
 440             ret = ff_default_query_formats(f);
 441         if (ret < 0 && ret != AVERROR(EAGAIN))
 442             return ret;
 443         /* note: EAGAIN could indicate a partial success, not counted yet */
 444         count_queried += ret >= 0;
 445     }
 446
 447     /* go through and merge as many format lists as possible */
 448     for (i = 0; i < graph->nb_filters; i++) {
 449         AVFilterContext *filter = graph->filters[i];
 450
 451         for (j = 0; j < filter->nb_inputs; j++) {
 452             AVFilterLink *link = filter->inputs[j];
 453             int convert_needed = 0;
 454
 455             if (!link)
 456                 continue;
 457
 458             if (link->in_formats != link->out_formats
 459                 && link->in_formats && link->out_formats)
 460                 if (!can_merge_formats(link->in_formats, link->out_formats,
 461                                       link->type, 0))
 462                     convert_needed = 1;
 463             if (link->type == AVMEDIA_TYPE_AUDIO) {
 464                 if (link->in_samplerates != link->out_samplerates
 465                     && link->in_samplerates && link->out_samplerates)
 466                     if (!can_merge_formats(link->in_samplerates,
 467                                            link->out_samplerates,
 468                                            0, 1))
 469                         convert_needed = 1;
 470             }
 471
 472 #define MERGE_DISPATCH(field, statement)                                     \
 473             if (!(link->in_ ## field && link->out_ ## field)) {              \
 474                 count_delayed++;                                             \
 475             } else if (link->in_ ## field == link->out_ ## field) {          \
 476                 count_already_merged++;                                      \
 477             } else if (!convert_needed) {                                    \
 478                 count_merged++;                                              \
 479                 statement                                                    \
 480             }
 481
 482             if (link->type == AVMEDIA_TYPE_AUDIO) {
 483                 MERGE_DISPATCH(channel_layouts,
 484                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 485                                                   link->out_channel_layouts))
 486                         convert_needed = 1;
 487                 )
 488                 MERGE_DISPATCH(samplerates,
 489                     if (!ff_merge_samplerates(link->in_samplerates,
 490                                               link->out_samplerates))
 491                         convert_needed = 1;
 492                 )
 493             }
 494             MERGE_DISPATCH(formats,
 495                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 496                                       link->type))
 497                     convert_needed = 1;
 498             )
 499 #undef MERGE_DISPATCH
 500
 501             if (convert_needed) {
 502                 AVFilterContext *convert;
 503                 AVFilter *filter;
 504                 AVFilterLink *inlink, *outlink;
 505                 char scale_args[256];
 506                 char inst_name[30];
 507
 508                 /* couldn't merge format lists. auto-insert conversion filter */
 509                 switch (link->type) {
 510                 case AVMEDIA_TYPE_VIDEO:
 511                     if (!(filter = avfilter_get_by_name("scale"))) {
 512                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 513                                "not present, cannot convert pixel formats.\n");
 514                         return AVERROR(EINVAL);
 515                     }
 516
 517                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 518                              scaler_count++);
 519
 520                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 521                                                             inst_name, graph->scale_sws_opts, NULL,
 522                                                             graph)) < 0)
 523                         return ret;
 524                     break;
 525                 case AVMEDIA_TYPE_AUDIO:
 526                     if (!(filter = avfilter_get_by_name("aresample"))) {
 527                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 528                                "not present, cannot convert audio formats.\n");
 529                         return AVERROR(EINVAL);
 530                     }
 531
 532                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 533                              resampler_count++);
 534                     scale_args[0] = '\0';
 535                     if (graph->aresample_swr_opts)
 536                         snprintf(scale_args, sizeof(scale_args), "%s",
 537                                  graph->aresample_swr_opts);
 538                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 539                                                             inst_name, graph->aresample_swr_opts,
 540                                                             NULL, graph)) < 0)
 541                         return ret;
 542                     break;
 543                 default:
 544                     return AVERROR(EINVAL);
 545                 }
 546
 547                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 548                     return ret;
 549
 550                 filter_query_formats(convert);
 551                 inlink  = convert->inputs[0];
 552                 outlink = convert->outputs[0];
 553                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 554                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 555                     ret |= AVERROR(ENOSYS);
 556                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 557                     (!ff_merge_samplerates(inlink->in_samplerates,
 558                                            inlink->out_samplerates) ||
 559                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 560                                                inlink->out_channel_layouts)))
 561                     ret |= AVERROR(ENOSYS);
 562                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 563                     (!ff_merge_samplerates(outlink->in_samplerates,
 564                                            outlink->out_samplerates) ||
 565                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 566                                                outlink->out_channel_layouts)))
 567                     ret |= AVERROR(ENOSYS);
 568
 569                 if (ret < 0) {
 570                     av_log(log_ctx, AV_LOG_ERROR,
 571                            "Impossible to convert between the formats supported by the filter "
 572                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 573                     return ret;
 574                 }
 575             }
 576         }
 577     }
 578
 579     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 580            "%d queried, %d merged, %d already done, %d delayed\n",
 581            count_queried, count_merged, count_already_merged, count_delayed);
 582     if (count_delayed) {
 583         AVBPrint bp;
 584
 585         /* if count_queried > 0, one filter at least did set its formats,
 586            that will give additional information to its neighbour;
 587            if count_merged > 0, one pair of formats lists at least was merged,
 588            that will give additional information to all connected filters;
 589            in both cases, progress was made and a new round must be done */
 590         if (count_queried || count_merged)
 591             return AVERROR(EAGAIN);
 592         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 593         for (i = 0; i < graph->nb_filters; i++)
 594             if (!formats_declared(graph->filters[i]))
 595                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 596                           graph->filters[i]->name);
 597         av_log(graph, AV_LOG_ERROR,
 598                "The following filters could not choose their formats: %s\n"
 599                "Consider inserting the (a)format filter near their input or "
 600                "output.\n", bp.str);
 601         return AVERROR(EIO);
 602     }
 603     return 0;
 604 }
 605
 606 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 607 {
 608     if (!link || !link->in_formats)
 609         return 0;
 610
 611     if (link->type == AVMEDIA_TYPE_VIDEO) {
 612         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 613             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 614             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 615             int i;
 616             for (i=0; i<link->in_formats->nb_formats; i++) {
 617                 enum AVPixelFormat p = link->in_formats->formats[i];
 618                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 619             }
 620             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 621                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 622                    av_get_pix_fmt_name(ref->format), has_alpha);
 623             link->in_formats->formats[0] = best;
 624         }
 625     }
 626
 627     link->in_formats->nb_formats = 1;
 628     link->format = link->in_formats->formats[0];
 629
 630     if (link->type == AVMEDIA_TYPE_AUDIO) {
 631         if (!link->in_samplerates->nb_formats) {
 632             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 633                    " the link between filters %s and %s.\n", link->src->name,
 634                    link->dst->name);
 635             return AVERROR(EINVAL);
 636         }
 637         link->in_samplerates->nb_formats = 1;
 638         link->sample_rate = link->in_samplerates->formats[0];
 639
 640         if (link->in_channel_layouts->all_layouts) {
 641             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 642                    " the link between filters %s and %s.\n", link->src->name,
 643                    link->dst->name);
 644             return AVERROR(EINVAL);
 645         }
 646         link->in_channel_layouts->nb_channel_layouts = 1;
 647         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 648         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 649             link->channel_layout = 0;
 650         else
 651             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 652     }
 653
 654     ff_formats_unref(&link->in_formats);
 655     ff_formats_unref(&link->out_formats);
 656     ff_formats_unref(&link->in_samplerates);
 657     ff_formats_unref(&link->out_samplerates);
 658     ff_channel_layouts_unref(&link->in_channel_layouts);
 659     ff_channel_layouts_unref(&link->out_channel_layouts);
 660
 661     return 0;
 662 }
 663
 664 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 665 do {                                                                   \
 666     for (i = 0; i < filter->nb_inputs; i++) {                          \
 667         AVFilterLink *link = filter->inputs[i];                        \
 668         fmt_type fmt;                                                  \
 669                                                                        \
 670         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 671             continue;                                                  \
 672         fmt = link->out_ ## list->var[0];                              \
 673                                                                        \
 674         for (j = 0; j < filter->nb_outputs; j++) {                     \
 675             AVFilterLink *out_link = filter->outputs[j];               \
 676             list_type *fmts;                                           \
 677                                                                        \
 678             if (link->type != out_link->type ||                        \
 679                 out_link->in_ ## list->nb == 1)                        \
 680                 continue;                                              \
 681             fmts = out_link->in_ ## list;                              \
 682                                                                        \
 683             if (!out_link->in_ ## list->nb) {                          \
 684                 add_format(&out_link->in_ ##list, fmt);                \
 685                 ret = 1;                                               \
 686                 break;                                                 \
 687             }                                                          \
 688                                                                        \
 689             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 690                 if (fmts->var[k] == fmt) {                             \
 691                     fmts->var[0]  = fmt;                               \
 692                     fmts->nb = 1;                                      \
 693                     ret = 1;                                           \
 694                     break;                                             \
 695                 }                                                      \
 696         }                                                              \
 697     }                                                                  \
 698 } while (0)
 699
 700 static int reduce_formats_on_filter(AVFilterContext *filter)
 701 {
 702     int i, j, k, ret = 0;
 703
 704     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 705                    nb_formats, ff_add_format);
 706     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 707                    nb_formats, ff_add_format);
 708
 709     /* reduce channel layouts */
 710     for (i = 0; i < filter->nb_inputs; i++) {
 711         AVFilterLink *inlink = filter->inputs[i];
 712         uint64_t fmt;
 713
 714         if (!inlink->out_channel_layouts ||
 715             inlink->out_channel_layouts->nb_channel_layouts != 1)
 716             continue;
 717         fmt = inlink->out_channel_layouts->channel_layouts[0];
 718
 719         for (j = 0; j < filter->nb_outputs; j++) {
 720             AVFilterLink *outlink = filter->outputs[j];
 721             AVFilterChannelLayouts *fmts;
 722
 723             fmts = outlink->in_channel_layouts;
 724             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 725                 continue;
 726
 727             if (fmts->all_layouts) {
 728                 /* Turn the infinite list into a singleton */
 729                 fmts->all_layouts = fmts->all_counts  = 0;
 730                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 731                 break;
 732             }
 733
 734             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 735                 if (fmts->channel_layouts[k] == fmt) {
 736                     fmts->channel_layouts[0]  = fmt;
 737                     fmts->nb_channel_layouts = 1;
 738                     ret = 1;
 739                     break;
 740                 }
 741             }
 742         }
 743     }
 744
 745     return ret;
 746 }
 747
 748 static void reduce_formats(AVFilterGraph *graph)
 749 {
 750     int i, reduced;
 751
 752     do {
 753         reduced = 0;
 754
 755         for (i = 0; i < graph->nb_filters; i++)
 756             reduced |= reduce_formats_on_filter(graph->filters[i]);
 757     } while (reduced);
 758 }
 759
 760 static void swap_samplerates_on_filter(AVFilterContext *filter)
 761 {
 762     AVFilterLink *link = NULL;
 763     int sample_rate;
 764     int i, j;
 765
 766     for (i = 0; i < filter->nb_inputs; i++) {
 767         link = filter->inputs[i];
 768
 769         if (link->type == AVMEDIA_TYPE_AUDIO &&
 770             link->out_samplerates->nb_formats== 1)
 771             break;
 772     }
 773     if (i == filter->nb_inputs)
 774         return;
 775
 776     sample_rate = link->out_samplerates->formats[0];
 777
 778     for (i = 0; i < filter->nb_outputs; i++) {
 779         AVFilterLink *outlink = filter->outputs[i];
 780         int best_idx, best_diff = INT_MAX;
 781
 782         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 783             outlink->in_samplerates->nb_formats < 2)
 784             continue;
 785
 786         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 787             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 788
 789             if (diff < best_diff) {
 790                 best_diff = diff;
 791                 best_idx  = j;
 792             }
 793         }
 794         FFSWAP(int, outlink->in_samplerates->formats[0],
 795                outlink->in_samplerates->formats[best_idx]);
 796     }
 797 }
 798
 799 static void swap_samplerates(AVFilterGraph *graph)
 800 {
 801     int i;
 802
 803     for (i = 0; i < graph->nb_filters; i++)
 804         swap_samplerates_on_filter(graph->filters[i]);
 805 }
 806
 807 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 808 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 809 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 810 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 811 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 812 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 813 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 814
 815 /* allowable substitutions for channel pairs when comparing layouts,
 816  * ordered by priority for both values */
 817 static const uint64_t ch_subst[][2] = {
 818     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 819     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 820     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 821     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 822     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 823     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 824     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 825     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 826     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 827     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 828     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 829     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 830     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 831     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 832     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 833     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 834     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 835     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 836     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 837     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 838     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 839 };
 840
 841 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 842 {
 843     AVFilterLink *link = NULL;
 844     int i, j, k;
 845
 846     for (i = 0; i < filter->nb_inputs; i++) {
 847         link = filter->inputs[i];
 848
 849         if (link->type == AVMEDIA_TYPE_AUDIO &&
 850             link->out_channel_layouts->nb_channel_layouts == 1)
 851             break;
 852     }
 853     if (i == filter->nb_inputs)
 854         return;
 855
 856     for (i = 0; i < filter->nb_outputs; i++) {
 857         AVFilterLink *outlink = filter->outputs[i];
 858         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 859
 860         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 861             outlink->in_channel_layouts->nb_channel_layouts < 2)
 862             continue;
 863
 864         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 865             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 866             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 867             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 868             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 869             int count_diff        = out_channels - in_channels;
 870             int matched_channels, extra_channels;
 871             int score = 100000;
 872
 873             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 874                 /* Compute score in case the input or output layout encodes
 875                    a channel count; in this case the score is not altered by
 876                    the computation afterwards, as in_chlayout and
 877                    out_chlayout have both been set to 0 */
 878                 if (FF_LAYOUT2COUNT(in_chlayout))
 879                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 880                 if (FF_LAYOUT2COUNT(out_chlayout))
 881                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 882                 score -= 10000 + FFABS(out_channels - in_channels) +
 883                          (in_channels > out_channels ? 10000 : 0);
 884                 in_chlayout = out_chlayout = 0;
 885                 /* Let the remaining computation run, even if the score
 886                    value is not altered */
 887             }
 888
 889             /* channel substitution */
 890             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 891                 uint64_t cmp0 = ch_subst[k][0];
 892                 uint64_t cmp1 = ch_subst[k][1];
 893                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 894                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 895                     in_chlayout  &= ~cmp0;
 896                     out_chlayout &= ~cmp1;
 897                     /* add score for channel match, minus a deduction for
 898                        having to do the substitution */
 899                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 900                 }
 901             }
 902
 903             /* no penalty for LFE channel mismatch */
 904             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 905                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 906                 score += 10;
 907             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 908             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 909
 910             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 911                                                                  out_chlayout);
 912             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 913                                                                  (~in_chlayout));
 914             score += 10 * matched_channels - 5 * extra_channels;
 915
 916             if (score > best_score ||
 917                 (count_diff < best_count_diff && score == best_score)) {
 918                 best_score = score;
 919                 best_idx   = j;
 920                 best_count_diff = count_diff;
 921             }
 922         }
 923         av_assert0(best_idx >= 0);
 924         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 925                outlink->in_channel_layouts->channel_layouts[best_idx]);
 926     }
 927
 928 }
 929
 930 static void swap_channel_layouts(AVFilterGraph *graph)
 931 {
 932     int i;
 933
 934     for (i = 0; i < graph->nb_filters; i++)
 935         swap_channel_layouts_on_filter(graph->filters[i]);
 936 }
 937
 938 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 939 {
 940     AVFilterLink *link = NULL;
 941     int format, bps;
 942     int i, j;
 943
 944     for (i = 0; i < filter->nb_inputs; i++) {
 945         link = filter->inputs[i];
 946
 947         if (link->type == AVMEDIA_TYPE_AUDIO &&
 948             link->out_formats->nb_formats == 1)
 949             break;
 950     }
 951     if (i == filter->nb_inputs)
 952         return;
 953
 954     format = link->out_formats->formats[0];
 955     bps    = av_get_bytes_per_sample(format);
 956
 957     for (i = 0; i < filter->nb_outputs; i++) {
 958         AVFilterLink *outlink = filter->outputs[i];
 959         int best_idx = -1, best_score = INT_MIN;
 960
 961         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 962             outlink->in_formats->nb_formats < 2)
 963             continue;
 964
 965         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
 966             int out_format = outlink->in_formats->formats[j];
 967             int out_bps    = av_get_bytes_per_sample(out_format);
 968             int score;
 969
 970             if (av_get_packed_sample_fmt(out_format) == format ||
 971                 av_get_planar_sample_fmt(out_format) == format) {
 972                 best_idx   = j;
 973                 break;
 974             }
 975
 976             /* for s32 and float prefer double to prevent loss of information */
 977             if (bps == 4 && out_bps == 8) {
 978                 best_idx = j;
 979                 break;
 980             }
 981
 982             /* prefer closest higher or equal bps */
 983             score = -abs(out_bps - bps);
 984             if (out_bps >= bps)
 985                 score += INT_MAX/2;
 986
 987             if (score > best_score) {
 988                 best_score = score;
 989                 best_idx   = j;
 990             }
 991         }
 992         av_assert0(best_idx >= 0);
 993         FFSWAP(int, outlink->in_formats->formats[0],
 994                outlink->in_formats->formats[best_idx]);
 995     }
 996 }
 997
 998 static void swap_sample_fmts(AVFilterGraph *graph)
 999 {
1000     int i;
1001
1002     for (i = 0; i < graph->nb_filters; i++)
1003         swap_sample_fmts_on_filter(graph->filters[i]);
1004
1005 }
1006
1007 static int pick_formats(AVFilterGraph *graph)
1008 {
1009     int i, j, ret;
1010     int change;
1011
1012     do{
1013         change = 0;
1014         for (i = 0; i < graph->nb_filters; i++) {
1015             AVFilterContext *filter = graph->filters[i];
1016             if (filter->nb_inputs){
1017                 for (j = 0; j < filter->nb_inputs; j++){
1018                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1019                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1020                             return ret;
1021                         change = 1;
1022                     }
1023                 }
1024             }
1025             if (filter->nb_outputs){
1026                 for (j = 0; j < filter->nb_outputs; j++){
1027                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1028                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1029                             return ret;
1030                         change = 1;
1031                     }
1032                 }
1033             }
1034             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1035                 for (j = 0; j < filter->nb_outputs; j++) {
1036                     if(filter->outputs[j]->format<0) {
1037                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1038                             return ret;
1039                         change = 1;
1040                     }
1041                 }
1042             }
1043         }
1044     }while(change);
1045
1046     for (i = 0; i < graph->nb_filters; i++) {
1047         AVFilterContext *filter = graph->filters[i];
1048
1049         for (j = 0; j < filter->nb_inputs; j++)
1050             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1051                 return ret;
1052         for (j = 0; j < filter->nb_outputs; j++)
1053             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1054                 return ret;
1055     }
1056     return 0;
1057 }
1058
1059 /**
1060  * Configure the formats of all the links in the graph.
1061  */
1062 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1063 {
1064     int ret;
1065
1066     /* find supported formats from sub-filters, and merge along links */
1067     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1068         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1069     if (ret < 0)
1070         return ret;
1071
1072     /* Once everything is merged, it's possible that we'll still have
1073      * multiple valid media format choices. We try to minimize the amount
1074      * of format conversion inside filters */
1075     reduce_formats(graph);
1076
1077     /* for audio filters, ensure the best format, sample rate and channel layout
1078      * is selected */
1079     swap_sample_fmts(graph);
1080     swap_samplerates(graph);
1081     swap_channel_layouts(graph);
1082
1083     if ((ret = pick_formats(graph)) < 0)
1084         return ret;
1085
1086     return 0;
1087 }
1088
1089 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
1090                                              AVClass *log_ctx)
1091 {
1092     unsigned i, j;
1093     int sink_links_count = 0, n = 0;
1094     AVFilterContext *f;
1095     AVFilterLink **sinks;
1096
1097     for (i = 0; i < graph->nb_filters; i++) {
1098         f = graph->filters[i];
1099         for (j = 0; j < f->nb_inputs; j++) {
1100             f->inputs[j]->graph     = graph;
1101             f->inputs[j]->age_index = -1;
1102         }
1103         for (j = 0; j < f->nb_outputs; j++) {
1104             f->outputs[j]->graph    = graph;
1105             f->outputs[j]->age_index= -1;
1106         }
1107         if (!f->nb_outputs) {
1108             if (f->nb_inputs > INT_MAX - sink_links_count)
1109                 return AVERROR(EINVAL);
1110             sink_links_count += f->nb_inputs;
1111         }
1112     }
1113     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1114     if (!sinks)
1115         return AVERROR(ENOMEM);
1116     for (i = 0; i < graph->nb_filters; i++) {
1117         f = graph->filters[i];
1118         if (!f->nb_outputs) {
1119             for (j = 0; j < f->nb_inputs; j++) {
1120                 sinks[n] = f->inputs[j];
1121                 f->inputs[j]->age_index = n++;
1122             }
1123         }
1124     }
1125     av_assert0(n == sink_links_count);
1126     graph->sink_links       = sinks;
1127     graph->sink_links_count = sink_links_count;
1128     return 0;
1129 }
1130
1131 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1132 {
1133     AVFilterContext *f;
1134     int i, j, ret;
1135     int fifo_count = 0;
1136
1137     for (i = 0; i < graph->nb_filters; i++) {
1138         f = graph->filters[i];
1139
1140         for (j = 0; j < f->nb_inputs; j++) {
1141             AVFilterLink *link = f->inputs[j];
1142             AVFilterContext *fifo_ctx;
1143             AVFilter *fifo;
1144             char name[32];
1145
1146             if (!link->dstpad->needs_fifo)
1147                 continue;
1148
1149             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1150                    avfilter_get_by_name("fifo") :
1151                    avfilter_get_by_name("afifo");
1152
1153             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1154
1155             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1156                                                NULL, graph);
1157             if (ret < 0)
1158                 return ret;
1159
1160             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1161             if (ret < 0)
1162                 return ret;
1163         }
1164     }
1165
1166     return 0;
1167 }
1168
1169 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1170 {
1171     int ret;
1172
1173     if ((ret = graph_check_validity(graphctx, log_ctx)))
1174         return ret;
1175     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1176         return ret;
1177     if ((ret = graph_config_formats(graphctx, log_ctx)))
1178         return ret;
1179     if ((ret = graph_config_links(graphctx, log_ctx)))
1180         return ret;
1181     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1182         return ret;
1183
1184     return 0;
1185 }
1186
1187 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1188 {
1189     int i, r = AVERROR(ENOSYS);
1190
1191     if (!graph)
1192         return r;
1193
1194     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1195         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1196         if (r != AVERROR(ENOSYS))
1197             return r;
1198     }
1199
1200     if (res_len && res)
1201         res[0] = 0;
1202
1203     for (i = 0; i < graph->nb_filters; i++) {
1204         AVFilterContext *filter = graph->filters[i];
1205         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1206             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1207             if (r != AVERROR(ENOSYS)) {
1208                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1209                     return r;
1210             }
1211         }
1212     }
1213
1214     return r;
1215 }
1216
1217 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1218 {
1219     int i;
1220
1221     if(!graph)
1222         return 0;
1223
1224     for (i = 0; i < graph->nb_filters; i++) {
1225         AVFilterContext *filter = graph->filters[i];
1226         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1227             AVFilterCommand **queue = &filter->command_queue, *next;
1228             while (*queue && (*queue)->time <= ts)
1229                 queue = &(*queue)->next;
1230             next = *queue;
1231             *queue = av_mallocz(sizeof(AVFilterCommand));
1232             (*queue)->command = av_strdup(command);
1233             (*queue)->arg     = av_strdup(arg);
1234             (*queue)->time    = ts;
1235             (*queue)->flags   = flags;
1236             (*queue)->next    = next;
1237             if(flags & AVFILTER_CMD_FLAG_ONE)
1238                 return 0;
1239         }
1240     }
1241
1242     return 0;
1243 }
1244
1245 static void heap_bubble_up(AVFilterGraph *graph,
1246                            AVFilterLink *link, int index)
1247 {
1248     AVFilterLink **links = graph->sink_links;
1249
1250     while (index) {
1251         int parent = (index - 1) >> 1;
1252         if (links[parent]->current_pts >= link->current_pts)
1253             break;
1254         links[index] = links[parent];
1255         links[index]->age_index = index;
1256         index = parent;
1257     }
1258     links[index] = link;
1259     link->age_index = index;
1260 }
1261
1262 static void heap_bubble_down(AVFilterGraph *graph,
1263                              AVFilterLink *link, int index)
1264 {
1265     AVFilterLink **links = graph->sink_links;
1266
1267     while (1) {
1268         int child = 2 * index + 1;
1269         if (child >= graph->sink_links_count)
1270             break;
1271         if (child + 1 < graph->sink_links_count &&
1272             links[child + 1]->current_pts < links[child]->current_pts)
1273             child++;
1274         if (link->current_pts < links[child]->current_pts)
1275             break;
1276         links[index] = links[child];
1277         links[index]->age_index = index;
1278         index = child;
1279     }
1280     links[index] = link;
1281     link->age_index = index;
1282 }
1283
1284 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1285 {
1286     heap_bubble_up  (graph, link, link->age_index);
1287     heap_bubble_down(graph, link, link->age_index);
1288 }
1289
1290
1291 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1292 {
1293     while (graph->sink_links_count) {
1294         AVFilterLink *oldest = graph->sink_links[0];
1295         int r = ff_request_frame(oldest);
1296         if (r != AVERROR_EOF)
1297             return r;
1298         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1299                oldest->dst ? oldest->dst->name : "unknown",
1300                oldest->dstpad ? oldest->dstpad->name : "unknown");
1301         /* EOF: remove the link from the heap */
1302         if (oldest->age_index < --graph->sink_links_count)
1303             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1304                              oldest->age_index);
1305         oldest->age_index = -1;
1306     }
1307     return AVERROR_EOF;
1308 }