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                 if ((ret = filter_query_formats(convert)) < 0)
 563                     return ret;
 564
 565                 inlink  = convert->inputs[0];
 566                 outlink = convert->outputs[0];
 567                 av_assert0( inlink-> in_formats->refcount > 0);
 568                 av_assert0( inlink->out_formats->refcount > 0);
 569                 av_assert0(outlink-> in_formats->refcount > 0);
 570                 av_assert0(outlink->out_formats->refcount > 0);
 571                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 572                     av_assert0( inlink-> in_samplerates->refcount > 0);
 573                     av_assert0( inlink->out_samplerates->refcount > 0);
 574                     av_assert0(outlink-> in_samplerates->refcount > 0);
 575                     av_assert0(outlink->out_samplerates->refcount > 0);
 576                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
 577                     av_assert0( inlink->out_channel_layouts->refcount > 0);
 578                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
 579                     av_assert0(outlink->out_channel_layouts->refcount > 0);
 580                 }
 581                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 582                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 583                     ret = AVERROR(ENOSYS);
 584                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 585                     (!ff_merge_samplerates(inlink->in_samplerates,
 586                                            inlink->out_samplerates) ||
 587                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 588                                                inlink->out_channel_layouts)))
 589                     ret = AVERROR(ENOSYS);
 590                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 591                     (!ff_merge_samplerates(outlink->in_samplerates,
 592                                            outlink->out_samplerates) ||
 593                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 594                                                outlink->out_channel_layouts)))
 595                     ret = AVERROR(ENOSYS);
 596
 597                 if (ret < 0) {
 598                     av_log(log_ctx, AV_LOG_ERROR,
 599                            "Impossible to convert between the formats supported by the filter "
 600                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 601                     return ret;
 602                 }
 603             }
 604         }
 605     }
 606
 607     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 608            "%d queried, %d merged, %d already done, %d delayed\n",
 609            count_queried, count_merged, count_already_merged, count_delayed);
 610     if (count_delayed) {
 611         AVBPrint bp;
 612
 613         /* if count_queried > 0, one filter at least did set its formats,
 614            that will give additional information to its neighbour;
 615            if count_merged > 0, one pair of formats lists at least was merged,
 616            that will give additional information to all connected filters;
 617            in both cases, progress was made and a new round must be done */
 618         if (count_queried || count_merged)
 619             return AVERROR(EAGAIN);
 620         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 621         for (i = 0; i < graph->nb_filters; i++)
 622             if (!formats_declared(graph->filters[i]))
 623                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 624                           graph->filters[i]->name);
 625         av_log(graph, AV_LOG_ERROR,
 626                "The following filters could not choose their formats: %s\n"
 627                "Consider inserting the (a)format filter near their input or "
 628                "output.\n", bp.str);
 629         return AVERROR(EIO);
 630     }
 631     return 0;
 632 }
 633
 634 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 635 {
 636     int score = 0;
 637
 638     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 639         score ++;
 640
 641     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 642         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 643     }else
 644         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 645
 646     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 647         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 648         score += 20;
 649
 650     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 651         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 652         score += 2;
 653
 654     return score;
 655 }
 656
 657 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 658                                                      enum AVSampleFormat src_fmt)
 659 {
 660     int score1, score2;
 661
 662     score1 = get_fmt_score(dst_fmt1, src_fmt);
 663     score2 = get_fmt_score(dst_fmt2, src_fmt);
 664
 665     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 666 }
 667
 668 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 669 {
 670     if (!link || !link->in_formats)
 671         return 0;
 672
 673     if (link->type == AVMEDIA_TYPE_VIDEO) {
 674         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 675             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 676             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 677             int i;
 678             for (i=0; i<link->in_formats->nb_formats; i++) {
 679                 enum AVPixelFormat p = link->in_formats->formats[i];
 680                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 681             }
 682             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 683                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 684                    av_get_pix_fmt_name(ref->format), has_alpha);
 685             link->in_formats->formats[0] = best;
 686         }
 687     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 688         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 689             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 690             int i;
 691             for (i=0; i<link->in_formats->nb_formats; i++) {
 692                 enum AVSampleFormat p = link->in_formats->formats[i];
 693                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 694             }
 695             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 696                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
 697                    av_get_sample_fmt_name(ref->format));
 698             link->in_formats->formats[0] = best;
 699         }
 700     }
 701
 702     link->in_formats->nb_formats = 1;
 703     link->format = link->in_formats->formats[0];
 704
 705     if (link->type == AVMEDIA_TYPE_AUDIO) {
 706         if (!link->in_samplerates->nb_formats) {
 707             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 708                    " the link between filters %s and %s.\n", link->src->name,
 709                    link->dst->name);
 710             return AVERROR(EINVAL);
 711         }
 712         link->in_samplerates->nb_formats = 1;
 713         link->sample_rate = link->in_samplerates->formats[0];
 714
 715         if (link->in_channel_layouts->all_layouts) {
 716             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 717                    " the link between filters %s and %s.\n", link->src->name,
 718                    link->dst->name);
 719             if (!link->in_channel_layouts->all_counts)
 720                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 721                        "supported, try specifying a channel layout using "
 722                        "'aformat=channel_layouts=something'.\n");
 723             return AVERROR(EINVAL);
 724         }
 725         link->in_channel_layouts->nb_channel_layouts = 1;
 726         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 727         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 728             link->channel_layout = 0;
 729         else
 730             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 731     }
 732
 733     ff_formats_unref(&link->in_formats);
 734     ff_formats_unref(&link->out_formats);
 735     ff_formats_unref(&link->in_samplerates);
 736     ff_formats_unref(&link->out_samplerates);
 737     ff_channel_layouts_unref(&link->in_channel_layouts);
 738     ff_channel_layouts_unref(&link->out_channel_layouts);
 739
 740     return 0;
 741 }
 742
 743 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 744 do {                                                                   \
 745     for (i = 0; i < filter->nb_inputs; i++) {                          \
 746         AVFilterLink *link = filter->inputs[i];                        \
 747         fmt_type fmt;                                                  \
 748                                                                        \
 749         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 750             continue;                                                  \
 751         fmt = link->out_ ## list->var[0];                              \
 752                                                                        \
 753         for (j = 0; j < filter->nb_outputs; j++) {                     \
 754             AVFilterLink *out_link = filter->outputs[j];               \
 755             list_type *fmts;                                           \
 756                                                                        \
 757             if (link->type != out_link->type ||                        \
 758                 out_link->in_ ## list->nb == 1)                        \
 759                 continue;                                              \
 760             fmts = out_link->in_ ## list;                              \
 761                                                                        \
 762             if (!out_link->in_ ## list->nb) {                          \
 763                 add_format(&out_link->in_ ##list, fmt);                \
 764                 ret = 1;                                               \
 765                 break;                                                 \
 766             }                                                          \
 767                                                                        \
 768             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 769                 if (fmts->var[k] == fmt) {                             \
 770                     fmts->var[0]  = fmt;                               \
 771                     fmts->nb = 1;                                      \
 772                     ret = 1;                                           \
 773                     break;                                             \
 774                 }                                                      \
 775         }                                                              \
 776     }                                                                  \
 777 } while (0)
 778
 779 static int reduce_formats_on_filter(AVFilterContext *filter)
 780 {
 781     int i, j, k, ret = 0;
 782
 783     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 784                    nb_formats, ff_add_format);
 785     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 786                    nb_formats, ff_add_format);
 787
 788     /* reduce channel layouts */
 789     for (i = 0; i < filter->nb_inputs; i++) {
 790         AVFilterLink *inlink = filter->inputs[i];
 791         uint64_t fmt;
 792
 793         if (!inlink->out_channel_layouts ||
 794             inlink->out_channel_layouts->nb_channel_layouts != 1)
 795             continue;
 796         fmt = inlink->out_channel_layouts->channel_layouts[0];
 797
 798         for (j = 0; j < filter->nb_outputs; j++) {
 799             AVFilterLink *outlink = filter->outputs[j];
 800             AVFilterChannelLayouts *fmts;
 801
 802             fmts = outlink->in_channel_layouts;
 803             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 804                 continue;
 805
 806             if (fmts->all_layouts &&
 807                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 808                 /* Turn the infinite list into a singleton */
 809                 fmts->all_layouts = fmts->all_counts  = 0;
 810                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 811                 break;
 812             }
 813
 814             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 815                 if (fmts->channel_layouts[k] == fmt) {
 816                     fmts->channel_layouts[0]  = fmt;
 817                     fmts->nb_channel_layouts = 1;
 818                     ret = 1;
 819                     break;
 820                 }
 821             }
 822         }
 823     }
 824
 825     return ret;
 826 }
 827
 828 static void reduce_formats(AVFilterGraph *graph)
 829 {
 830     int i, reduced;
 831
 832     do {
 833         reduced = 0;
 834
 835         for (i = 0; i < graph->nb_filters; i++)
 836             reduced |= reduce_formats_on_filter(graph->filters[i]);
 837     } while (reduced);
 838 }
 839
 840 static void swap_samplerates_on_filter(AVFilterContext *filter)
 841 {
 842     AVFilterLink *link = NULL;
 843     int sample_rate;
 844     int i, j;
 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_samplerates->nb_formats== 1)
 851             break;
 852     }
 853     if (i == filter->nb_inputs)
 854         return;
 855
 856     sample_rate = link->out_samplerates->formats[0];
 857
 858     for (i = 0; i < filter->nb_outputs; i++) {
 859         AVFilterLink *outlink = filter->outputs[i];
 860         int best_idx, best_diff = INT_MAX;
 861
 862         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 863             outlink->in_samplerates->nb_formats < 2)
 864             continue;
 865
 866         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 867             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 868
 869             if (diff < best_diff) {
 870                 best_diff = diff;
 871                 best_idx  = j;
 872             }
 873         }
 874         FFSWAP(int, outlink->in_samplerates->formats[0],
 875                outlink->in_samplerates->formats[best_idx]);
 876     }
 877 }
 878
 879 static void swap_samplerates(AVFilterGraph *graph)
 880 {
 881     int i;
 882
 883     for (i = 0; i < graph->nb_filters; i++)
 884         swap_samplerates_on_filter(graph->filters[i]);
 885 }
 886
 887 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 888 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 889 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 890 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 891 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 892 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 893 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 894
 895 /* allowable substitutions for channel pairs when comparing layouts,
 896  * ordered by priority for both values */
 897 static const uint64_t ch_subst[][2] = {
 898     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 899     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 900     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 901     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 902     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 903     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 904     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 905     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 906     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 907     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 908     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 909     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 910     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 911     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 912     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 913     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 914     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 915     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 916     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 917     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 918     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 919 };
 920
 921 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 922 {
 923     AVFilterLink *link = NULL;
 924     int i, j, k;
 925
 926     for (i = 0; i < filter->nb_inputs; i++) {
 927         link = filter->inputs[i];
 928
 929         if (link->type == AVMEDIA_TYPE_AUDIO &&
 930             link->out_channel_layouts->nb_channel_layouts == 1)
 931             break;
 932     }
 933     if (i == filter->nb_inputs)
 934         return;
 935
 936     for (i = 0; i < filter->nb_outputs; i++) {
 937         AVFilterLink *outlink = filter->outputs[i];
 938         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 939
 940         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 941             outlink->in_channel_layouts->nb_channel_layouts < 2)
 942             continue;
 943
 944         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 945             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 946             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 947             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 948             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 949             int count_diff        = out_channels - in_channels;
 950             int matched_channels, extra_channels;
 951             int score = 100000;
 952
 953             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 954                 /* Compute score in case the input or output layout encodes
 955                    a channel count; in this case the score is not altered by
 956                    the computation afterwards, as in_chlayout and
 957                    out_chlayout have both been set to 0 */
 958                 if (FF_LAYOUT2COUNT(in_chlayout))
 959                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 960                 if (FF_LAYOUT2COUNT(out_chlayout))
 961                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 962                 score -= 10000 + FFABS(out_channels - in_channels) +
 963                          (in_channels > out_channels ? 10000 : 0);
 964                 in_chlayout = out_chlayout = 0;
 965                 /* Let the remaining computation run, even if the score
 966                    value is not altered */
 967             }
 968
 969             /* channel substitution */
 970             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 971                 uint64_t cmp0 = ch_subst[k][0];
 972                 uint64_t cmp1 = ch_subst[k][1];
 973                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 974                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 975                     in_chlayout  &= ~cmp0;
 976                     out_chlayout &= ~cmp1;
 977                     /* add score for channel match, minus a deduction for
 978                        having to do the substitution */
 979                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 980                 }
 981             }
 982
 983             /* no penalty for LFE channel mismatch */
 984             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 985                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 986                 score += 10;
 987             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 988             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 989
 990             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 991                                                                  out_chlayout);
 992             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 993                                                                  (~in_chlayout));
 994             score += 10 * matched_channels - 5 * extra_channels;
 995
 996             if (score > best_score ||
 997                 (count_diff < best_count_diff && score == best_score)) {
 998                 best_score = score;
 999                 best_idx   = j;
1000                 best_count_diff = count_diff;
1001             }
1002         }
1003         av_assert0(best_idx >= 0);
1004         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1005                outlink->in_channel_layouts->channel_layouts[best_idx]);
1006     }
1007
1008 }
1009
1010 static void swap_channel_layouts(AVFilterGraph *graph)
1011 {
1012     int i;
1013
1014     for (i = 0; i < graph->nb_filters; i++)
1015         swap_channel_layouts_on_filter(graph->filters[i]);
1016 }
1017
1018 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1019 {
1020     AVFilterLink *link = NULL;
1021     int format, bps;
1022     int i, j;
1023
1024     for (i = 0; i < filter->nb_inputs; i++) {
1025         link = filter->inputs[i];
1026
1027         if (link->type == AVMEDIA_TYPE_AUDIO &&
1028             link->out_formats->nb_formats == 1)
1029             break;
1030     }
1031     if (i == filter->nb_inputs)
1032         return;
1033
1034     format = link->out_formats->formats[0];
1035     bps    = av_get_bytes_per_sample(format);
1036
1037     for (i = 0; i < filter->nb_outputs; i++) {
1038         AVFilterLink *outlink = filter->outputs[i];
1039         int best_idx = -1, best_score = INT_MIN;
1040
1041         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1042             outlink->in_formats->nb_formats < 2)
1043             continue;
1044
1045         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1046             int out_format = outlink->in_formats->formats[j];
1047             int out_bps    = av_get_bytes_per_sample(out_format);
1048             int score;
1049
1050             if (av_get_packed_sample_fmt(out_format) == format ||
1051                 av_get_planar_sample_fmt(out_format) == format) {
1052                 best_idx   = j;
1053                 break;
1054             }
1055
1056             /* for s32 and float prefer double to prevent loss of information */
1057             if (bps == 4 && out_bps == 8) {
1058                 best_idx = j;
1059                 break;
1060             }
1061
1062             /* prefer closest higher or equal bps */
1063             score = -abs(out_bps - bps);
1064             if (out_bps >= bps)
1065                 score += INT_MAX/2;
1066
1067             if (score > best_score) {
1068                 best_score = score;
1069                 best_idx   = j;
1070             }
1071         }
1072         av_assert0(best_idx >= 0);
1073         FFSWAP(int, outlink->in_formats->formats[0],
1074                outlink->in_formats->formats[best_idx]);
1075     }
1076 }
1077
1078 static void swap_sample_fmts(AVFilterGraph *graph)
1079 {
1080     int i;
1081
1082     for (i = 0; i < graph->nb_filters; i++)
1083         swap_sample_fmts_on_filter(graph->filters[i]);
1084
1085 }
1086
1087 static int pick_formats(AVFilterGraph *graph)
1088 {
1089     int i, j, ret;
1090     int change;
1091
1092     do{
1093         change = 0;
1094         for (i = 0; i < graph->nb_filters; i++) {
1095             AVFilterContext *filter = graph->filters[i];
1096             if (filter->nb_inputs){
1097                 for (j = 0; j < filter->nb_inputs; j++){
1098                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1099                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1100                             return ret;
1101                         change = 1;
1102                     }
1103                 }
1104             }
1105             if (filter->nb_outputs){
1106                 for (j = 0; j < filter->nb_outputs; j++){
1107                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1108                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1109                             return ret;
1110                         change = 1;
1111                     }
1112                 }
1113             }
1114             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1115                 for (j = 0; j < filter->nb_outputs; j++) {
1116                     if(filter->outputs[j]->format<0) {
1117                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1118                             return ret;
1119                         change = 1;
1120                     }
1121                 }
1122             }
1123         }
1124     }while(change);
1125
1126     for (i = 0; i < graph->nb_filters; i++) {
1127         AVFilterContext *filter = graph->filters[i];
1128
1129         for (j = 0; j < filter->nb_inputs; j++)
1130             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1131                 return ret;
1132         for (j = 0; j < filter->nb_outputs; j++)
1133             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1134                 return ret;
1135     }
1136     return 0;
1137 }
1138
1139 /**
1140  * Configure the formats of all the links in the graph.
1141  */
1142 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1143 {
1144     int ret;
1145
1146     /* find supported formats from sub-filters, and merge along links */
1147     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1148         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1149     if (ret < 0)
1150         return ret;
1151
1152     /* Once everything is merged, it's possible that we'll still have
1153      * multiple valid media format choices. We try to minimize the amount
1154      * of format conversion inside filters */
1155     reduce_formats(graph);
1156
1157     /* for audio filters, ensure the best format, sample rate and channel layout
1158      * is selected */
1159     swap_sample_fmts(graph);
1160     swap_samplerates(graph);
1161     swap_channel_layouts(graph);
1162
1163     if ((ret = pick_formats(graph)) < 0)
1164         return ret;
1165
1166     return 0;
1167 }
1168
1169 static int graph_config_pointers(AVFilterGraph *graph,
1170                                              AVClass *log_ctx)
1171 {
1172     unsigned i, j;
1173     int sink_links_count = 0, n = 0;
1174     AVFilterContext *f;
1175     AVFilterLink **sinks;
1176
1177     for (i = 0; i < graph->nb_filters; i++) {
1178         f = graph->filters[i];
1179         for (j = 0; j < f->nb_inputs; j++) {
1180             f->inputs[j]->graph     = graph;
1181             f->inputs[j]->age_index = -1;
1182         }
1183         for (j = 0; j < f->nb_outputs; j++) {
1184             f->outputs[j]->graph    = graph;
1185             f->outputs[j]->age_index= -1;
1186         }
1187         if (!f->nb_outputs) {
1188             if (f->nb_inputs > INT_MAX - sink_links_count)
1189                 return AVERROR(EINVAL);
1190             sink_links_count += f->nb_inputs;
1191         }
1192     }
1193     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1194     if (!sinks)
1195         return AVERROR(ENOMEM);
1196     for (i = 0; i < graph->nb_filters; i++) {
1197         f = graph->filters[i];
1198         if (!f->nb_outputs) {
1199             for (j = 0; j < f->nb_inputs; j++) {
1200                 sinks[n] = f->inputs[j];
1201                 f->inputs[j]->age_index = n++;
1202             }
1203         }
1204     }
1205     av_assert0(n == sink_links_count);
1206     graph->sink_links       = sinks;
1207     graph->sink_links_count = sink_links_count;
1208     return 0;
1209 }
1210
1211 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1212 {
1213     AVFilterContext *f;
1214     int i, j, ret;
1215     int fifo_count = 0;
1216
1217     for (i = 0; i < graph->nb_filters; i++) {
1218         f = graph->filters[i];
1219
1220         for (j = 0; j < f->nb_inputs; j++) {
1221             AVFilterLink *link = f->inputs[j];
1222             AVFilterContext *fifo_ctx;
1223             AVFilter *fifo;
1224             char name[32];
1225
1226             if (!link->dstpad->needs_fifo)
1227                 continue;
1228
1229             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1230                    avfilter_get_by_name("fifo") :
1231                    avfilter_get_by_name("afifo");
1232
1233             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1234
1235             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1236                                                NULL, graph);
1237             if (ret < 0)
1238                 return ret;
1239
1240             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1241             if (ret < 0)
1242                 return ret;
1243         }
1244     }
1245
1246     return 0;
1247 }
1248
1249 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1250 {
1251     int ret;
1252
1253     if ((ret = graph_check_validity(graphctx, log_ctx)))
1254         return ret;
1255     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1256         return ret;
1257     if ((ret = graph_config_formats(graphctx, log_ctx)))
1258         return ret;
1259     if ((ret = graph_config_links(graphctx, log_ctx)))
1260         return ret;
1261     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1262         return ret;
1263
1264     return 0;
1265 }
1266
1267 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1268 {
1269     int i, r = AVERROR(ENOSYS);
1270
1271     if (!graph)
1272         return r;
1273
1274     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1275         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1276         if (r != AVERROR(ENOSYS))
1277             return r;
1278     }
1279
1280     if (res_len && res)
1281         res[0] = 0;
1282
1283     for (i = 0; i < graph->nb_filters; i++) {
1284         AVFilterContext *filter = graph->filters[i];
1285         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1286             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1287             if (r != AVERROR(ENOSYS)) {
1288                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1289                     return r;
1290             }
1291         }
1292     }
1293
1294     return r;
1295 }
1296
1297 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1298 {
1299     int i;
1300
1301     if(!graph)
1302         return 0;
1303
1304     for (i = 0; i < graph->nb_filters; i++) {
1305         AVFilterContext *filter = graph->filters[i];
1306         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1307             AVFilterCommand **queue = &filter->command_queue, *next;
1308             while (*queue && (*queue)->time <= ts)
1309                 queue = &(*queue)->next;
1310             next = *queue;
1311             *queue = av_mallocz(sizeof(AVFilterCommand));
1312             (*queue)->command = av_strdup(command);
1313             (*queue)->arg     = av_strdup(arg);
1314             (*queue)->time    = ts;
1315             (*queue)->flags   = flags;
1316             (*queue)->next    = next;
1317             if(flags & AVFILTER_CMD_FLAG_ONE)
1318                 return 0;
1319         }
1320     }
1321
1322     return 0;
1323 }
1324
1325 static void heap_bubble_up(AVFilterGraph *graph,
1326                            AVFilterLink *link, int index)
1327 {
1328     AVFilterLink **links = graph->sink_links;
1329
1330     av_assert0(index >= 0);
1331
1332     while (index) {
1333         int parent = (index - 1) >> 1;
1334         if (links[parent]->current_pts >= link->current_pts)
1335             break;
1336         links[index] = links[parent];
1337         links[index]->age_index = index;
1338         index = parent;
1339     }
1340     links[index] = link;
1341     link->age_index = index;
1342 }
1343
1344 static void heap_bubble_down(AVFilterGraph *graph,
1345                              AVFilterLink *link, int index)
1346 {
1347     AVFilterLink **links = graph->sink_links;
1348
1349     av_assert0(index >= 0);
1350
1351     while (1) {
1352         int child = 2 * index + 1;
1353         if (child >= graph->sink_links_count)
1354             break;
1355         if (child + 1 < graph->sink_links_count &&
1356             links[child + 1]->current_pts < links[child]->current_pts)
1357             child++;
1358         if (link->current_pts < links[child]->current_pts)
1359             break;
1360         links[index] = links[child];
1361         links[index]->age_index = index;
1362         index = child;
1363     }
1364     links[index] = link;
1365     link->age_index = index;
1366 }
1367
1368 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1369 {
1370     heap_bubble_up  (graph, link, link->age_index);
1371     heap_bubble_down(graph, link, link->age_index);
1372 }
1373
1374
1375 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1376 {
1377     while (graph->sink_links_count) {
1378         AVFilterLink *oldest = graph->sink_links[0];
1379         int r = ff_request_frame(oldest);
1380         if (r != AVERROR_EOF)
1381             return r;
1382         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1383                oldest->dst ? oldest->dst->name : "unknown",
1384                oldest->dstpad ? oldest->dstpad->name : "unknown");
1385         /* EOF: remove the link from the heap */
1386         if (oldest->age_index < --graph->sink_links_count)
1387             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1388                              oldest->age_index);
1389         oldest->age_index = -1;
1390     }
1391     return AVERROR_EOF;
1392 }