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
  35 #include "avfilter.h"
  36 #include "formats.h"
  37 #include "internal.h"
  38 #include "thread.h"
  39
  40 #define OFFSET(x) offsetof(AVFilterGraph, x)
  41 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  42 static const AVOption filtergraph_options[] = {
  43     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  44         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
  45         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
  46     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  47         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
  48     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  49         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  50     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  51         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  52     { NULL },
  53 };
  54
  55 static const AVClass filtergraph_class = {
  56     .class_name = "AVFilterGraph",
  57     .item_name  = av_default_item_name,
  58     .version    = LIBAVUTIL_VERSION_INT,
  59     .option     = filtergraph_options,
  60     .category   = AV_CLASS_CATEGORY_FILTER,
  61 };
  62
  63 #if !HAVE_THREADS
  64 void ff_graph_thread_free(AVFilterGraph *graph)
  65 {
  66 }
  67
  68 int ff_graph_thread_init(AVFilterGraph *graph)
  69 {
  70     graph->thread_type = 0;
  71     graph->nb_threads  = 1;
  72     return 0;
  73 }
  74 #endif
  75
  76 AVFilterGraph *avfilter_graph_alloc(void)
  77 {
  78     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  79     if (!ret)
  80         return NULL;
  81
  82     ret->internal = av_mallocz(sizeof(*ret->internal));
  83     if (!ret->internal) {
  84         av_freep(&ret);
  85         return NULL;
  86     }
  87
  88     ret->av_class = &filtergraph_class;
  89     av_opt_set_defaults(ret);
  90
  91     return ret;
  92 }
  93
  94 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
  95 {
  96     int i;
  97     for (i = 0; i < graph->nb_filters; i++) {
  98         if (graph->filters[i] == filter) {
  99             FFSWAP(AVFilterContext*, graph->filters[i],
 100                    graph->filters[graph->nb_filters - 1]);
 101             graph->nb_filters--;
 102             return;
 103         }
 104     }
 105 }
 106
 107 void avfilter_graph_free(AVFilterGraph **graph)
 108 {
 109     if (!*graph)
 110         return;
 111
 112     while ((*graph)->nb_filters)
 113         avfilter_free((*graph)->filters[0]);
 114
 115     ff_graph_thread_free(*graph);
 116
 117     av_freep(&(*graph)->sink_links);
 118
 119     av_freep(&(*graph)->scale_sws_opts);
 120     av_freep(&(*graph)->aresample_swr_opts);
 121     av_freep(&(*graph)->resample_lavr_opts);
 122     av_freep(&(*graph)->filters);
 123     av_freep(&(*graph)->internal);
 124     av_freep(graph);
 125 }
 126
 127 #if FF_API_AVFILTER_OPEN
 128 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 129 {
 130     AVFilterContext **filters = av_realloc(graph->filters,
 131                                            sizeof(*filters) * (graph->nb_filters + 1));
 132     if (!filters)
 133         return AVERROR(ENOMEM);
 134
 135     graph->filters = filters;
 136     graph->filters[graph->nb_filters++] = filter;
 137
 138 #if FF_API_FOO_COUNT
 139 FF_DISABLE_DEPRECATION_WARNINGS
 140     graph->filter_count_unused = graph->nb_filters;
 141 FF_ENABLE_DEPRECATION_WARNINGS
 142 #endif
 143
 144     filter->graph = graph;
 145
 146     return 0;
 147 }
 148 #endif
 149
 150 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 151                                  const char *name, const char *args, void *opaque,
 152                                  AVFilterGraph *graph_ctx)
 153 {
 154     int ret;
 155
 156     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 157     if (!*filt_ctx)
 158         return AVERROR(ENOMEM);
 159
 160     ret = avfilter_init_str(*filt_ctx, args);
 161     if (ret < 0)
 162         goto fail;
 163
 164     return 0;
 165
 166 fail:
 167     if (*filt_ctx)
 168         avfilter_free(*filt_ctx);
 169     *filt_ctx = NULL;
 170     return ret;
 171 }
 172
 173 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 174 {
 175     graph->disable_auto_convert = flags;
 176 }
 177
 178 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 179                                              const AVFilter *filter,
 180                                              const char *name)
 181 {
 182     AVFilterContext **filters, *s;
 183
 184     if (graph->thread_type && !graph->internal->thread_execute) {
 185         if (graph->execute) {
 186             graph->internal->thread_execute = graph->execute;
 187         } else {
 188             int ret = ff_graph_thread_init(graph);
 189             if (ret < 0) {
 190                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
 191                 return NULL;
 192             }
 193         }
 194     }
 195
 196     s = ff_filter_alloc(filter, name);
 197     if (!s)
 198         return NULL;
 199
 200     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 201     if (!filters) {
 202         avfilter_free(s);
 203         return NULL;
 204     }
 205
 206     graph->filters = filters;
 207     graph->filters[graph->nb_filters++] = s;
 208
 209 #if FF_API_FOO_COUNT
 210 FF_DISABLE_DEPRECATION_WARNINGS
 211     graph->filter_count_unused = graph->nb_filters;
 212 FF_ENABLE_DEPRECATION_WARNINGS
 213 #endif
 214
 215     s->graph = graph;
 216
 217     return s;
 218 }
 219
 220 /**
 221  * Check for the validity of graph.
 222  *
 223  * A graph is considered valid if all its input and output pads are
 224  * connected.
 225  *
 226  * @return >= 0 in case of success, a negative value otherwise
 227  */
 228 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 229 {
 230     AVFilterContext *filt;
 231     int i, j;
 232
 233     for (i = 0; i < graph->nb_filters; i++) {
 234         const AVFilterPad *pad;
 235         filt = graph->filters[i];
 236
 237         for (j = 0; j < filt->nb_inputs; j++) {
 238             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 239                 pad = &filt->input_pads[j];
 240                 av_log(log_ctx, AV_LOG_ERROR,
 241                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 242                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 243                 return AVERROR(EINVAL);
 244             }
 245         }
 246
 247         for (j = 0; j < filt->nb_outputs; j++) {
 248             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 249                 pad = &filt->output_pads[j];
 250                 av_log(log_ctx, AV_LOG_ERROR,
 251                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 252                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 253                 return AVERROR(EINVAL);
 254             }
 255         }
 256     }
 257
 258     return 0;
 259 }
 260
 261 /**
 262  * Configure all the links of graphctx.
 263  *
 264  * @return >= 0 in case of success, a negative value otherwise
 265  */
 266 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 267 {
 268     AVFilterContext *filt;
 269     int i, ret;
 270
 271     for (i = 0; i < graph->nb_filters; i++) {
 272         filt = graph->filters[i];
 273
 274         if (!filt->nb_outputs) {
 275             if ((ret = avfilter_config_links(filt)))
 276                 return ret;
 277         }
 278     }
 279
 280     return 0;
 281 }
 282
 283 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
 284 {
 285     int i;
 286
 287     for (i = 0; i < graph->nb_filters; i++)
 288         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 289             return graph->filters[i];
 290
 291     return NULL;
 292 }
 293
 294 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 295 {
 296     if (!l)
 297         return;
 298     if (l->nb_channel_layouts) {
 299         if (l->all_layouts || l->all_counts)
 300             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 301         l->all_layouts = l->all_counts = 0;
 302     } else {
 303         if (l->all_counts && !l->all_layouts)
 304             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 305         l->all_layouts = 1;
 306     }
 307 }
 308
 309 static int filter_query_formats(AVFilterContext *ctx)
 310 {
 311     int ret, i;
 312     AVFilterFormats *formats;
 313     AVFilterChannelLayouts *chlayouts;
 314     AVFilterFormats *samplerates;
 315     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 316                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 317                             AVMEDIA_TYPE_VIDEO;
 318
 319     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 320         if (ret != AVERROR(EAGAIN))
 321             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 322                    ctx->name, av_err2str(ret));
 323         return ret;
 324     }
 325
 326     for (i = 0; i < ctx->nb_inputs; i++)
 327         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 328     for (i = 0; i < ctx->nb_outputs; i++)
 329         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 330
 331     formats = ff_all_formats(type);
 332     if (!formats)
 333         return AVERROR(ENOMEM);
 334     ff_set_common_formats(ctx, formats);
 335     if (type == AVMEDIA_TYPE_AUDIO) {
 336         samplerates = ff_all_samplerates();
 337         if (!samplerates)
 338             return AVERROR(ENOMEM);
 339         ff_set_common_samplerates(ctx, samplerates);
 340         chlayouts = ff_all_channel_layouts();
 341         if (!chlayouts)
 342             return AVERROR(ENOMEM);
 343         ff_set_common_channel_layouts(ctx, chlayouts);
 344     }
 345     return 0;
 346 }
 347
 348 static int formats_declared(AVFilterContext *f)
 349 {
 350     int i;
 351
 352     for (i = 0; i < f->nb_inputs; i++) {
 353         if (!f->inputs[i]->out_formats)
 354             return 0;
 355         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 356             !(f->inputs[i]->out_samplerates &&
 357               f->inputs[i]->out_channel_layouts))
 358             return 0;
 359     }
 360     for (i = 0; i < f->nb_outputs; i++) {
 361         if (!f->outputs[i]->in_formats)
 362             return 0;
 363         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 364             !(f->outputs[i]->in_samplerates &&
 365               f->outputs[i]->in_channel_layouts))
 366             return 0;
 367     }
 368     return 1;
 369 }
 370
 371 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 372 {
 373     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 374     if (a) {
 375         a->refcount = 0;
 376         a->refs     = NULL;
 377         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 378         if (!a->formats && arg->formats)
 379             av_freep(&a);
 380     }
 381     return a;
 382 }
 383
 384 static int can_merge_formats(AVFilterFormats *a_arg,
 385                              AVFilterFormats *b_arg,
 386                              enum AVMediaType type,
 387                              int is_sample_rate)
 388 {
 389     AVFilterFormats *a, *b, *ret;
 390     if (a_arg == b_arg)
 391         return 1;
 392     a = clone_filter_formats(a_arg);
 393     b = clone_filter_formats(b_arg);
 394
 395     if (!a || !b) {
 396         if (a)
 397             av_freep(&a->formats);
 398         if (b)
 399             av_freep(&b->formats);
 400
 401         av_freep(&a);
 402         av_freep(&b);
 403
 404         return 0;
 405     }
 406
 407     if (is_sample_rate) {
 408         ret = ff_merge_samplerates(a, b);
 409     } else {
 410         ret = ff_merge_formats(a, b, type);
 411     }
 412     if (ret) {
 413         av_freep(&ret->formats);
 414         av_freep(&ret->refs);
 415         av_freep(&ret);
 416         return 1;
 417     } else {
 418         av_freep(&a->formats);
 419         av_freep(&b->formats);
 420         av_freep(&a);
 421         av_freep(&b);
 422         return 0;
 423     }
 424 }
 425
 426 /**
 427  * Perform one round of query_formats() and merging formats lists on the
 428  * filter graph.
 429  * @return  >=0 if all links formats lists could be queried and merged;
 430  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 431  *          and a later call may succeed;
 432  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 433  *          was made and the negotiation is stuck;
 434  *          a negative error code if some other error happened
 435  */
 436 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 437 {
 438     int i, j, ret;
 439     int scaler_count = 0, resampler_count = 0;
 440     int count_queried = 0;        /* successful calls to query_formats() */
 441     int count_merged = 0;         /* successful merge of formats lists */
 442     int count_already_merged = 0; /* lists already merged */
 443     int count_delayed = 0;        /* lists that need to be merged later */
 444
 445     for (i = 0; i < graph->nb_filters; i++) {
 446         AVFilterContext *f = graph->filters[i];
 447         if (formats_declared(f))
 448             continue;
 449         if (f->filter->query_formats)
 450             ret = filter_query_formats(f);
 451         else
 452             ret = ff_default_query_formats(f);
 453         if (ret < 0 && ret != AVERROR(EAGAIN))
 454             return ret;
 455         /* note: EAGAIN could indicate a partial success, not counted yet */
 456         count_queried += ret >= 0;
 457     }
 458
 459     /* go through and merge as many format lists as possible */
 460     for (i = 0; i < graph->nb_filters; i++) {
 461         AVFilterContext *filter = graph->filters[i];
 462
 463         for (j = 0; j < filter->nb_inputs; j++) {
 464             AVFilterLink *link = filter->inputs[j];
 465             int convert_needed = 0;
 466
 467             if (!link)
 468                 continue;
 469
 470             if (link->in_formats != link->out_formats
 471                 && link->in_formats && link->out_formats)
 472                 if (!can_merge_formats(link->in_formats, link->out_formats,
 473                                       link->type, 0))
 474                     convert_needed = 1;
 475             if (link->type == AVMEDIA_TYPE_AUDIO) {
 476                 if (link->in_samplerates != link->out_samplerates
 477                     && link->in_samplerates && link->out_samplerates)
 478                     if (!can_merge_formats(link->in_samplerates,
 479                                            link->out_samplerates,
 480                                            0, 1))
 481                         convert_needed = 1;
 482             }
 483
 484 #define MERGE_DISPATCH(field, statement)                                     \
 485             if (!(link->in_ ## field && link->out_ ## field)) {              \
 486                 count_delayed++;                                             \
 487             } else if (link->in_ ## field == link->out_ ## field) {          \
 488                 count_already_merged++;                                      \
 489             } else if (!convert_needed) {                                    \
 490                 count_merged++;                                              \
 491                 statement                                                    \
 492             }
 493
 494             if (link->type == AVMEDIA_TYPE_AUDIO) {
 495                 MERGE_DISPATCH(channel_layouts,
 496                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 497                                                   link->out_channel_layouts))
 498                         convert_needed = 1;
 499                 )
 500                 MERGE_DISPATCH(samplerates,
 501                     if (!ff_merge_samplerates(link->in_samplerates,
 502                                               link->out_samplerates))
 503                         convert_needed = 1;
 504                 )
 505             }
 506             MERGE_DISPATCH(formats,
 507                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 508                                       link->type))
 509                     convert_needed = 1;
 510             )
 511 #undef MERGE_DISPATCH
 512
 513             if (convert_needed) {
 514                 AVFilterContext *convert;
 515                 AVFilter *filter;
 516                 AVFilterLink *inlink, *outlink;
 517                 char scale_args[256];
 518                 char inst_name[30];
 519
 520                 /* couldn't merge format lists. auto-insert conversion filter */
 521                 switch (link->type) {
 522                 case AVMEDIA_TYPE_VIDEO:
 523                     if (!(filter = avfilter_get_by_name("scale"))) {
 524                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 525                                "not present, cannot convert pixel formats.\n");
 526                         return AVERROR(EINVAL);
 527                     }
 528
 529                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 530                              scaler_count++);
 531
 532                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 533                                                             inst_name, graph->scale_sws_opts, NULL,
 534                                                             graph)) < 0)
 535                         return ret;
 536                     break;
 537                 case AVMEDIA_TYPE_AUDIO:
 538                     if (!(filter = avfilter_get_by_name("aresample"))) {
 539                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 540                                "not present, cannot convert audio formats.\n");
 541                         return AVERROR(EINVAL);
 542                     }
 543
 544                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 545                              resampler_count++);
 546                     scale_args[0] = '\0';
 547                     if (graph->aresample_swr_opts)
 548                         snprintf(scale_args, sizeof(scale_args), "%s",
 549                                  graph->aresample_swr_opts);
 550                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 551                                                             inst_name, graph->aresample_swr_opts,
 552                                                             NULL, graph)) < 0)
 553                         return ret;
 554                     break;
 555                 default:
 556                     return AVERROR(EINVAL);
 557                 }
 558
 559                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 560                     return ret;
 561
 562                 filter_query_formats(convert);
 563                 inlink  = convert->inputs[0];
 564                 outlink = convert->outputs[0];
 565                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 566                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 567                     ret |= AVERROR(ENOSYS);
 568                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 569                     (!ff_merge_samplerates(inlink->in_samplerates,
 570                                            inlink->out_samplerates) ||
 571                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 572                                                inlink->out_channel_layouts)))
 573                     ret |= AVERROR(ENOSYS);
 574                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 575                     (!ff_merge_samplerates(outlink->in_samplerates,
 576                                            outlink->out_samplerates) ||
 577                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 578                                                outlink->out_channel_layouts)))
 579                     ret |= AVERROR(ENOSYS);
 580
 581                 if (ret < 0) {
 582                     av_log(log_ctx, AV_LOG_ERROR,
 583                            "Impossible to convert between the formats supported by the filter "
 584                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 585                     return ret;
 586                 }
 587             }
 588         }
 589     }
 590
 591     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 592            "%d queried, %d merged, %d already done, %d delayed\n",
 593            count_queried, count_merged, count_already_merged, count_delayed);
 594     if (count_delayed) {
 595         AVBPrint bp;
 596
 597         /* if count_queried > 0, one filter at least did set its formats,
 598            that will give additional information to its neighbour;
 599            if count_merged > 0, one pair of formats lists at least was merged,
 600            that will give additional information to all connected filters;
 601            in both cases, progress was made and a new round must be done */
 602         if (count_queried || count_merged)
 603             return AVERROR(EAGAIN);
 604         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 605         for (i = 0; i < graph->nb_filters; i++)
 606             if (!formats_declared(graph->filters[i]))
 607                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 608                           graph->filters[i]->name);
 609         av_log(graph, AV_LOG_ERROR,
 610                "The following filters could not choose their formats: %s\n"
 611                "Consider inserting the (a)format filter near their input or "
 612                "output.\n", bp.str);
 613         return AVERROR(EIO);
 614     }
 615     return 0;
 616 }
 617
 618 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 619 {
 620     if (!link || !link->in_formats)
 621         return 0;
 622
 623     if (link->type == AVMEDIA_TYPE_VIDEO) {
 624         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 625             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 626             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 627             int i;
 628             for (i=0; i<link->in_formats->nb_formats; i++) {
 629                 enum AVPixelFormat p = link->in_formats->formats[i];
 630                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 631             }
 632             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 633                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 634                    av_get_pix_fmt_name(ref->format), has_alpha);
 635             link->in_formats->formats[0] = best;
 636         }
 637     }
 638
 639     link->in_formats->nb_formats = 1;
 640     link->format = link->in_formats->formats[0];
 641
 642     if (link->type == AVMEDIA_TYPE_AUDIO) {
 643         if (!link->in_samplerates->nb_formats) {
 644             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 645                    " the link between filters %s and %s.\n", link->src->name,
 646                    link->dst->name);
 647             return AVERROR(EINVAL);
 648         }
 649         link->in_samplerates->nb_formats = 1;
 650         link->sample_rate = link->in_samplerates->formats[0];
 651
 652         if (link->in_channel_layouts->all_layouts) {
 653             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 654                    " the link between filters %s and %s.\n", link->src->name,
 655                    link->dst->name);
 656             if (!link->in_channel_layouts->all_counts)
 657                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 658                        "supported, try specifying a channel layout using "
 659                        "'aformat=channel_layouts=something'.\n");
 660             return AVERROR(EINVAL);
 661         }
 662         link->in_channel_layouts->nb_channel_layouts = 1;
 663         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 664         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 665             link->channel_layout = 0;
 666         else
 667             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 668     }
 669
 670     ff_formats_unref(&link->in_formats);
 671     ff_formats_unref(&link->out_formats);
 672     ff_formats_unref(&link->in_samplerates);
 673     ff_formats_unref(&link->out_samplerates);
 674     ff_channel_layouts_unref(&link->in_channel_layouts);
 675     ff_channel_layouts_unref(&link->out_channel_layouts);
 676
 677     return 0;
 678 }
 679
 680 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 681 do {                                                                   \
 682     for (i = 0; i < filter->nb_inputs; i++) {                          \
 683         AVFilterLink *link = filter->inputs[i];                        \
 684         fmt_type fmt;                                                  \
 685                                                                        \
 686         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 687             continue;                                                  \
 688         fmt = link->out_ ## list->var[0];                              \
 689                                                                        \
 690         for (j = 0; j < filter->nb_outputs; j++) {                     \
 691             AVFilterLink *out_link = filter->outputs[j];               \
 692             list_type *fmts;                                           \
 693                                                                        \
 694             if (link->type != out_link->type ||                        \
 695                 out_link->in_ ## list->nb == 1)                        \
 696                 continue;                                              \
 697             fmts = out_link->in_ ## list;                              \
 698                                                                        \
 699             if (!out_link->in_ ## list->nb) {                          \
 700                 add_format(&out_link->in_ ##list, fmt);                \
 701                 ret = 1;                                               \
 702                 break;                                                 \
 703             }                                                          \
 704                                                                        \
 705             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 706                 if (fmts->var[k] == fmt) {                             \
 707                     fmts->var[0]  = fmt;                               \
 708                     fmts->nb = 1;                                      \
 709                     ret = 1;                                           \
 710                     break;                                             \
 711                 }                                                      \
 712         }                                                              \
 713     }                                                                  \
 714 } while (0)
 715
 716 static int reduce_formats_on_filter(AVFilterContext *filter)
 717 {
 718     int i, j, k, ret = 0;
 719
 720     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 721                    nb_formats, ff_add_format);
 722     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 723                    nb_formats, ff_add_format);
 724
 725     /* reduce channel layouts */
 726     for (i = 0; i < filter->nb_inputs; i++) {
 727         AVFilterLink *inlink = filter->inputs[i];
 728         uint64_t fmt;
 729
 730         if (!inlink->out_channel_layouts ||
 731             inlink->out_channel_layouts->nb_channel_layouts != 1)
 732             continue;
 733         fmt = inlink->out_channel_layouts->channel_layouts[0];
 734
 735         for (j = 0; j < filter->nb_outputs; j++) {
 736             AVFilterLink *outlink = filter->outputs[j];
 737             AVFilterChannelLayouts *fmts;
 738
 739             fmts = outlink->in_channel_layouts;
 740             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 741                 continue;
 742
 743             if (fmts->all_layouts &&
 744                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 745                 /* Turn the infinite list into a singleton */
 746                 fmts->all_layouts = fmts->all_counts  = 0;
 747                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 748                 break;
 749             }
 750
 751             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 752                 if (fmts->channel_layouts[k] == fmt) {
 753                     fmts->channel_layouts[0]  = fmt;
 754                     fmts->nb_channel_layouts = 1;
 755                     ret = 1;
 756                     break;
 757                 }
 758             }
 759         }
 760     }
 761
 762     return ret;
 763 }
 764
 765 static void reduce_formats(AVFilterGraph *graph)
 766 {
 767     int i, reduced;
 768
 769     do {
 770         reduced = 0;
 771
 772         for (i = 0; i < graph->nb_filters; i++)
 773             reduced |= reduce_formats_on_filter(graph->filters[i]);
 774     } while (reduced);
 775 }
 776
 777 static void swap_samplerates_on_filter(AVFilterContext *filter)
 778 {
 779     AVFilterLink *link = NULL;
 780     int sample_rate;
 781     int i, j;
 782
 783     for (i = 0; i < filter->nb_inputs; i++) {
 784         link = filter->inputs[i];
 785
 786         if (link->type == AVMEDIA_TYPE_AUDIO &&
 787             link->out_samplerates->nb_formats== 1)
 788             break;
 789     }
 790     if (i == filter->nb_inputs)
 791         return;
 792
 793     sample_rate = link->out_samplerates->formats[0];
 794
 795     for (i = 0; i < filter->nb_outputs; i++) {
 796         AVFilterLink *outlink = filter->outputs[i];
 797         int best_idx, best_diff = INT_MAX;
 798
 799         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 800             outlink->in_samplerates->nb_formats < 2)
 801             continue;
 802
 803         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 804             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 805
 806             if (diff < best_diff) {
 807                 best_diff = diff;
 808                 best_idx  = j;
 809             }
 810         }
 811         FFSWAP(int, outlink->in_samplerates->formats[0],
 812                outlink->in_samplerates->formats[best_idx]);
 813     }
 814 }
 815
 816 static void swap_samplerates(AVFilterGraph *graph)
 817 {
 818     int i;
 819
 820     for (i = 0; i < graph->nb_filters; i++)
 821         swap_samplerates_on_filter(graph->filters[i]);
 822 }
 823
 824 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 825 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 826 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 827 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 828 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 829 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 830 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 831
 832 /* allowable substitutions for channel pairs when comparing layouts,
 833  * ordered by priority for both values */
 834 static const uint64_t ch_subst[][2] = {
 835     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 836     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 837     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 838     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 839     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 840     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 841     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 842     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 843     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 844     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 845     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 846     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 847     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 848     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 849     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 850     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 851     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 852     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 853     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 854     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 855     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 856 };
 857
 858 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 859 {
 860     AVFilterLink *link = NULL;
 861     int i, j, k;
 862
 863     for (i = 0; i < filter->nb_inputs; i++) {
 864         link = filter->inputs[i];
 865
 866         if (link->type == AVMEDIA_TYPE_AUDIO &&
 867             link->out_channel_layouts->nb_channel_layouts == 1)
 868             break;
 869     }
 870     if (i == filter->nb_inputs)
 871         return;
 872
 873     for (i = 0; i < filter->nb_outputs; i++) {
 874         AVFilterLink *outlink = filter->outputs[i];
 875         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 876
 877         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 878             outlink->in_channel_layouts->nb_channel_layouts < 2)
 879             continue;
 880
 881         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 882             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 883             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 884             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 885             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 886             int count_diff        = out_channels - in_channels;
 887             int matched_channels, extra_channels;
 888             int score = 100000;
 889
 890             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 891                 /* Compute score in case the input or output layout encodes
 892                    a channel count; in this case the score is not altered by
 893                    the computation afterwards, as in_chlayout and
 894                    out_chlayout have both been set to 0 */
 895                 if (FF_LAYOUT2COUNT(in_chlayout))
 896                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 897                 if (FF_LAYOUT2COUNT(out_chlayout))
 898                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 899                 score -= 10000 + FFABS(out_channels - in_channels) +
 900                          (in_channels > out_channels ? 10000 : 0);
 901                 in_chlayout = out_chlayout = 0;
 902                 /* Let the remaining computation run, even if the score
 903                    value is not altered */
 904             }
 905
 906             /* channel substitution */
 907             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 908                 uint64_t cmp0 = ch_subst[k][0];
 909                 uint64_t cmp1 = ch_subst[k][1];
 910                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 911                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 912                     in_chlayout  &= ~cmp0;
 913                     out_chlayout &= ~cmp1;
 914                     /* add score for channel match, minus a deduction for
 915                        having to do the substitution */
 916                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 917                 }
 918             }
 919
 920             /* no penalty for LFE channel mismatch */
 921             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 922                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 923                 score += 10;
 924             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 925             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 926
 927             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 928                                                                  out_chlayout);
 929             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 930                                                                  (~in_chlayout));
 931             score += 10 * matched_channels - 5 * extra_channels;
 932
 933             if (score > best_score ||
 934                 (count_diff < best_count_diff && score == best_score)) {
 935                 best_score = score;
 936                 best_idx   = j;
 937                 best_count_diff = count_diff;
 938             }
 939         }
 940         av_assert0(best_idx >= 0);
 941         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 942                outlink->in_channel_layouts->channel_layouts[best_idx]);
 943     }
 944
 945 }
 946
 947 static void swap_channel_layouts(AVFilterGraph *graph)
 948 {
 949     int i;
 950
 951     for (i = 0; i < graph->nb_filters; i++)
 952         swap_channel_layouts_on_filter(graph->filters[i]);
 953 }
 954
 955 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 956 {
 957     AVFilterLink *link = NULL;
 958     int format, bps;
 959     int i, j;
 960
 961     for (i = 0; i < filter->nb_inputs; i++) {
 962         link = filter->inputs[i];
 963
 964         if (link->type == AVMEDIA_TYPE_AUDIO &&
 965             link->out_formats->nb_formats == 1)
 966             break;
 967     }
 968     if (i == filter->nb_inputs)
 969         return;
 970
 971     format = link->out_formats->formats[0];
 972     bps    = av_get_bytes_per_sample(format);
 973
 974     for (i = 0; i < filter->nb_outputs; i++) {
 975         AVFilterLink *outlink = filter->outputs[i];
 976         int best_idx = -1, best_score = INT_MIN;
 977
 978         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 979             outlink->in_formats->nb_formats < 2)
 980             continue;
 981
 982         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
 983             int out_format = outlink->in_formats->formats[j];
 984             int out_bps    = av_get_bytes_per_sample(out_format);
 985             int score;
 986
 987             if (av_get_packed_sample_fmt(out_format) == format ||
 988                 av_get_planar_sample_fmt(out_format) == format) {
 989                 best_idx   = j;
 990                 break;
 991             }
 992
 993             /* for s32 and float prefer double to prevent loss of information */
 994             if (bps == 4 && out_bps == 8) {
 995                 best_idx = j;
 996                 break;
 997             }
 998
 999             /* prefer closest higher or equal bps */
1000             score = -abs(out_bps - bps);
1001             if (out_bps >= bps)
1002                 score += INT_MAX/2;
1003
1004             if (score > best_score) {
1005                 best_score = score;
1006                 best_idx   = j;
1007             }
1008         }
1009         av_assert0(best_idx >= 0);
1010         FFSWAP(int, outlink->in_formats->formats[0],
1011                outlink->in_formats->formats[best_idx]);
1012     }
1013 }
1014
1015 static void swap_sample_fmts(AVFilterGraph *graph)
1016 {
1017     int i;
1018
1019     for (i = 0; i < graph->nb_filters; i++)
1020         swap_sample_fmts_on_filter(graph->filters[i]);
1021
1022 }
1023
1024 static int pick_formats(AVFilterGraph *graph)
1025 {
1026     int i, j, ret;
1027     int change;
1028
1029     do{
1030         change = 0;
1031         for (i = 0; i < graph->nb_filters; i++) {
1032             AVFilterContext *filter = graph->filters[i];
1033             if (filter->nb_inputs){
1034                 for (j = 0; j < filter->nb_inputs; j++){
1035                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1036                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1037                             return ret;
1038                         change = 1;
1039                     }
1040                 }
1041             }
1042             if (filter->nb_outputs){
1043                 for (j = 0; j < filter->nb_outputs; j++){
1044                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1045                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1046                             return ret;
1047                         change = 1;
1048                     }
1049                 }
1050             }
1051             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1052                 for (j = 0; j < filter->nb_outputs; j++) {
1053                     if(filter->outputs[j]->format<0) {
1054                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1055                             return ret;
1056                         change = 1;
1057                     }
1058                 }
1059             }
1060         }
1061     }while(change);
1062
1063     for (i = 0; i < graph->nb_filters; i++) {
1064         AVFilterContext *filter = graph->filters[i];
1065
1066         for (j = 0; j < filter->nb_inputs; j++)
1067             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1068                 return ret;
1069         for (j = 0; j < filter->nb_outputs; j++)
1070             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1071                 return ret;
1072     }
1073     return 0;
1074 }
1075
1076 /**
1077  * Configure the formats of all the links in the graph.
1078  */
1079 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1080 {
1081     int ret;
1082
1083     /* find supported formats from sub-filters, and merge along links */
1084     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1085         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1086     if (ret < 0)
1087         return ret;
1088
1089     /* Once everything is merged, it's possible that we'll still have
1090      * multiple valid media format choices. We try to minimize the amount
1091      * of format conversion inside filters */
1092     reduce_formats(graph);
1093
1094     /* for audio filters, ensure the best format, sample rate and channel layout
1095      * is selected */
1096     swap_sample_fmts(graph);
1097     swap_samplerates(graph);
1098     swap_channel_layouts(graph);
1099
1100     if ((ret = pick_formats(graph)) < 0)
1101         return ret;
1102
1103     return 0;
1104 }
1105
1106 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
1107                                              AVClass *log_ctx)
1108 {
1109     unsigned i, j;
1110     int sink_links_count = 0, n = 0;
1111     AVFilterContext *f;
1112     AVFilterLink **sinks;
1113
1114     for (i = 0; i < graph->nb_filters; i++) {
1115         f = graph->filters[i];
1116         for (j = 0; j < f->nb_inputs; j++) {
1117             f->inputs[j]->graph     = graph;
1118             f->inputs[j]->age_index = -1;
1119         }
1120         for (j = 0; j < f->nb_outputs; j++) {
1121             f->outputs[j]->graph    = graph;
1122             f->outputs[j]->age_index= -1;
1123         }
1124         if (!f->nb_outputs) {
1125             if (f->nb_inputs > INT_MAX - sink_links_count)
1126                 return AVERROR(EINVAL);
1127             sink_links_count += f->nb_inputs;
1128         }
1129     }
1130     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1131     if (!sinks)
1132         return AVERROR(ENOMEM);
1133     for (i = 0; i < graph->nb_filters; i++) {
1134         f = graph->filters[i];
1135         if (!f->nb_outputs) {
1136             for (j = 0; j < f->nb_inputs; j++) {
1137                 sinks[n] = f->inputs[j];
1138                 f->inputs[j]->age_index = n++;
1139             }
1140         }
1141     }
1142     av_assert0(n == sink_links_count);
1143     graph->sink_links       = sinks;
1144     graph->sink_links_count = sink_links_count;
1145     return 0;
1146 }
1147
1148 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1149 {
1150     AVFilterContext *f;
1151     int i, j, ret;
1152     int fifo_count = 0;
1153
1154     for (i = 0; i < graph->nb_filters; i++) {
1155         f = graph->filters[i];
1156
1157         for (j = 0; j < f->nb_inputs; j++) {
1158             AVFilterLink *link = f->inputs[j];
1159             AVFilterContext *fifo_ctx;
1160             AVFilter *fifo;
1161             char name[32];
1162
1163             if (!link->dstpad->needs_fifo)
1164                 continue;
1165
1166             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1167                    avfilter_get_by_name("fifo") :
1168                    avfilter_get_by_name("afifo");
1169
1170             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1171
1172             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1173                                                NULL, graph);
1174             if (ret < 0)
1175                 return ret;
1176
1177             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1178             if (ret < 0)
1179                 return ret;
1180         }
1181     }
1182
1183     return 0;
1184 }
1185
1186 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1187 {
1188     int ret;
1189
1190     if ((ret = graph_check_validity(graphctx, log_ctx)))
1191         return ret;
1192     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1193         return ret;
1194     if ((ret = graph_config_formats(graphctx, log_ctx)))
1195         return ret;
1196     if ((ret = graph_config_links(graphctx, log_ctx)))
1197         return ret;
1198     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1199         return ret;
1200
1201     return 0;
1202 }
1203
1204 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1205 {
1206     int i, r = AVERROR(ENOSYS);
1207
1208     if (!graph)
1209         return r;
1210
1211     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1212         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1213         if (r != AVERROR(ENOSYS))
1214             return r;
1215     }
1216
1217     if (res_len && res)
1218         res[0] = 0;
1219
1220     for (i = 0; i < graph->nb_filters; i++) {
1221         AVFilterContext *filter = graph->filters[i];
1222         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1223             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1224             if (r != AVERROR(ENOSYS)) {
1225                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1226                     return r;
1227             }
1228         }
1229     }
1230
1231     return r;
1232 }
1233
1234 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1235 {
1236     int i;
1237
1238     if(!graph)
1239         return 0;
1240
1241     for (i = 0; i < graph->nb_filters; i++) {
1242         AVFilterContext *filter = graph->filters[i];
1243         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1244             AVFilterCommand **queue = &filter->command_queue, *next;
1245             while (*queue && (*queue)->time <= ts)
1246                 queue = &(*queue)->next;
1247             next = *queue;
1248             *queue = av_mallocz(sizeof(AVFilterCommand));
1249             (*queue)->command = av_strdup(command);
1250             (*queue)->arg     = av_strdup(arg);
1251             (*queue)->time    = ts;
1252             (*queue)->flags   = flags;
1253             (*queue)->next    = next;
1254             if(flags & AVFILTER_CMD_FLAG_ONE)
1255                 return 0;
1256         }
1257     }
1258
1259     return 0;
1260 }
1261
1262 static void heap_bubble_up(AVFilterGraph *graph,
1263                            AVFilterLink *link, int index)
1264 {
1265     AVFilterLink **links = graph->sink_links;
1266
1267     while (index) {
1268         int parent = (index - 1) >> 1;
1269         if (links[parent]->current_pts >= link->current_pts)
1270             break;
1271         links[index] = links[parent];
1272         links[index]->age_index = index;
1273         index = parent;
1274     }
1275     links[index] = link;
1276     link->age_index = index;
1277 }
1278
1279 static void heap_bubble_down(AVFilterGraph *graph,
1280                              AVFilterLink *link, int index)
1281 {
1282     AVFilterLink **links = graph->sink_links;
1283
1284     while (1) {
1285         int child = 2 * index + 1;
1286         if (child >= graph->sink_links_count)
1287             break;
1288         if (child + 1 < graph->sink_links_count &&
1289             links[child + 1]->current_pts < links[child]->current_pts)
1290             child++;
1291         if (link->current_pts < links[child]->current_pts)
1292             break;
1293         links[index] = links[child];
1294         links[index]->age_index = index;
1295         index = child;
1296     }
1297     links[index] = link;
1298     link->age_index = index;
1299 }
1300
1301 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1302 {
1303     heap_bubble_up  (graph, link, link->age_index);
1304     heap_bubble_down(graph, link, link->age_index);
1305 }
1306
1307
1308 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1309 {
1310     while (graph->sink_links_count) {
1311         AVFilterLink *oldest = graph->sink_links[0];
1312         int r = ff_request_frame(oldest);
1313         if (r != AVERROR_EOF)
1314             return r;
1315         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1316                oldest->dst ? oldest->dst->name : "unknown",
1317                oldest->dstpad ? oldest->dstpad->name : "unknown");
1318         /* EOF: remove the link from the heap */
1319         if (oldest->age_index < --graph->sink_links_count)
1320             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1321                              oldest->age_index);
1322         oldest->age_index = -1;
1323     }
1324     return AVERROR_EOF;
1325 }