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     filter->graph = graph;
 139
 140     return 0;
 141 }
 142 #endif
 143
 144 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 145                                  const char *name, const char *args, void *opaque,
 146                                  AVFilterGraph *graph_ctx)
 147 {
 148     int ret;
 149
 150     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 151     if (!*filt_ctx)
 152         return AVERROR(ENOMEM);
 153
 154     ret = avfilter_init_str(*filt_ctx, args);
 155     if (ret < 0)
 156         goto fail;
 157
 158     return 0;
 159
 160 fail:
 161     if (*filt_ctx)
 162         avfilter_free(*filt_ctx);
 163     *filt_ctx = NULL;
 164     return ret;
 165 }
 166
 167 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 168 {
 169     graph->disable_auto_convert = flags;
 170 }
 171
 172 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 173                                              const AVFilter *filter,
 174                                              const char *name)
 175 {
 176     AVFilterContext **filters, *s;
 177
 178     if (graph->thread_type && !graph->internal->thread_execute) {
 179         if (graph->execute) {
 180             graph->internal->thread_execute = graph->execute;
 181         } else {
 182             int ret = ff_graph_thread_init(graph);
 183             if (ret < 0) {
 184                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
 185                 return NULL;
 186             }
 187         }
 188     }
 189
 190     s = ff_filter_alloc(filter, name);
 191     if (!s)
 192         return NULL;
 193
 194     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 195     if (!filters) {
 196         avfilter_free(s);
 197         return NULL;
 198     }
 199
 200     graph->filters = filters;
 201     graph->filters[graph->nb_filters++] = s;
 202
 203     s->graph = graph;
 204
 205     return s;
 206 }
 207
 208 /**
 209  * Check for the validity of graph.
 210  *
 211  * A graph is considered valid if all its input and output pads are
 212  * connected.
 213  *
 214  * @return >= 0 in case of success, a negative value otherwise
 215  */
 216 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 217 {
 218     AVFilterContext *filt;
 219     int i, j;
 220
 221     for (i = 0; i < graph->nb_filters; i++) {
 222         const AVFilterPad *pad;
 223         filt = graph->filters[i];
 224
 225         for (j = 0; j < filt->nb_inputs; j++) {
 226             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 227                 pad = &filt->input_pads[j];
 228                 av_log(log_ctx, AV_LOG_ERROR,
 229                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 230                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 231                 return AVERROR(EINVAL);
 232             }
 233         }
 234
 235         for (j = 0; j < filt->nb_outputs; j++) {
 236             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 237                 pad = &filt->output_pads[j];
 238                 av_log(log_ctx, AV_LOG_ERROR,
 239                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 240                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 241                 return AVERROR(EINVAL);
 242             }
 243         }
 244     }
 245
 246     return 0;
 247 }
 248
 249 /**
 250  * Configure all the links of graphctx.
 251  *
 252  * @return >= 0 in case of success, a negative value otherwise
 253  */
 254 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 255 {
 256     AVFilterContext *filt;
 257     int i, ret;
 258
 259     for (i = 0; i < graph->nb_filters; i++) {
 260         filt = graph->filters[i];
 261
 262         if (!filt->nb_outputs) {
 263             if ((ret = avfilter_config_links(filt)))
 264                 return ret;
 265         }
 266     }
 267
 268     return 0;
 269 }
 270
 271 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
 272 {
 273     int i;
 274
 275     for (i = 0; i < graph->nb_filters; i++)
 276         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 277             return graph->filters[i];
 278
 279     return NULL;
 280 }
 281
 282 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 283 {
 284     if (!l)
 285         return;
 286     if (l->nb_channel_layouts) {
 287         if (l->all_layouts || l->all_counts)
 288             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 289         l->all_layouts = l->all_counts = 0;
 290     } else {
 291         if (l->all_counts && !l->all_layouts)
 292             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 293         l->all_layouts = 1;
 294     }
 295 }
 296
 297 static int filter_query_formats(AVFilterContext *ctx)
 298 {
 299     int ret, i;
 300     AVFilterFormats *formats;
 301     AVFilterChannelLayouts *chlayouts;
 302     AVFilterFormats *samplerates;
 303     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 304                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 305                             AVMEDIA_TYPE_VIDEO;
 306
 307     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 308         if (ret != AVERROR(EAGAIN))
 309             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 310                    ctx->name, av_err2str(ret));
 311         return ret;
 312     }
 313
 314     for (i = 0; i < ctx->nb_inputs; i++)
 315         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 316     for (i = 0; i < ctx->nb_outputs; i++)
 317         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 318
 319     formats = ff_all_formats(type);
 320     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
 321         return ret;
 322     if (type == AVMEDIA_TYPE_AUDIO) {
 323         samplerates = ff_all_samplerates();
 324         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
 325             return ret;
 326         chlayouts = ff_all_channel_layouts();
 327         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
 328             return ret;
 329     }
 330     return 0;
 331 }
 332
 333 static int formats_declared(AVFilterContext *f)
 334 {
 335     int i;
 336
 337     for (i = 0; i < f->nb_inputs; i++) {
 338         if (!f->inputs[i]->out_formats)
 339             return 0;
 340         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 341             !(f->inputs[i]->out_samplerates &&
 342               f->inputs[i]->out_channel_layouts))
 343             return 0;
 344     }
 345     for (i = 0; i < f->nb_outputs; i++) {
 346         if (!f->outputs[i]->in_formats)
 347             return 0;
 348         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 349             !(f->outputs[i]->in_samplerates &&
 350               f->outputs[i]->in_channel_layouts))
 351             return 0;
 352     }
 353     return 1;
 354 }
 355
 356 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 357 {
 358     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 359     if (a) {
 360         a->refcount = 0;
 361         a->refs     = NULL;
 362         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 363         if (!a->formats && arg->formats)
 364             av_freep(&a);
 365     }
 366     return a;
 367 }
 368
 369 static int can_merge_formats(AVFilterFormats *a_arg,
 370                              AVFilterFormats *b_arg,
 371                              enum AVMediaType type,
 372                              int is_sample_rate)
 373 {
 374     AVFilterFormats *a, *b, *ret;
 375     if (a_arg == b_arg)
 376         return 1;
 377     a = clone_filter_formats(a_arg);
 378     b = clone_filter_formats(b_arg);
 379
 380     if (!a || !b) {
 381         if (a)
 382             av_freep(&a->formats);
 383         if (b)
 384             av_freep(&b->formats);
 385
 386         av_freep(&a);
 387         av_freep(&b);
 388
 389         return 0;
 390     }
 391
 392     if (is_sample_rate) {
 393         ret = ff_merge_samplerates(a, b);
 394     } else {
 395         ret = ff_merge_formats(a, b, type);
 396     }
 397     if (ret) {
 398         av_freep(&ret->formats);
 399         av_freep(&ret->refs);
 400         av_freep(&ret);
 401         return 1;
 402     } else {
 403         av_freep(&a->formats);
 404         av_freep(&b->formats);
 405         av_freep(&a);
 406         av_freep(&b);
 407         return 0;
 408     }
 409 }
 410
 411 /**
 412  * Perform one round of query_formats() and merging formats lists on the
 413  * filter graph.
 414  * @return  >=0 if all links formats lists could be queried and merged;
 415  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 416  *          and a later call may succeed;
 417  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 418  *          was made and the negotiation is stuck;
 419  *          a negative error code if some other error happened
 420  */
 421 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 422 {
 423     int i, j, ret;
 424     int scaler_count = 0, resampler_count = 0;
 425     int count_queried = 0;        /* successful calls to query_formats() */
 426     int count_merged = 0;         /* successful merge of formats lists */
 427     int count_already_merged = 0; /* lists already merged */
 428     int count_delayed = 0;        /* lists that need to be merged later */
 429
 430     for (i = 0; i < graph->nb_filters; i++) {
 431         AVFilterContext *f = graph->filters[i];
 432         if (formats_declared(f))
 433             continue;
 434         if (f->filter->query_formats)
 435             ret = filter_query_formats(f);
 436         else
 437             ret = ff_default_query_formats(f);
 438         if (ret < 0 && ret != AVERROR(EAGAIN))
 439             return ret;
 440         /* note: EAGAIN could indicate a partial success, not counted yet */
 441         count_queried += ret >= 0;
 442     }
 443
 444     /* go through and merge as many format lists as possible */
 445     for (i = 0; i < graph->nb_filters; i++) {
 446         AVFilterContext *filter = graph->filters[i];
 447
 448         for (j = 0; j < filter->nb_inputs; j++) {
 449             AVFilterLink *link = filter->inputs[j];
 450             int convert_needed = 0;
 451
 452             if (!link)
 453                 continue;
 454
 455             if (link->in_formats != link->out_formats
 456                 && link->in_formats && link->out_formats)
 457                 if (!can_merge_formats(link->in_formats, link->out_formats,
 458                                       link->type, 0))
 459                     convert_needed = 1;
 460             if (link->type == AVMEDIA_TYPE_AUDIO) {
 461                 if (link->in_samplerates != link->out_samplerates
 462                     && link->in_samplerates && link->out_samplerates)
 463                     if (!can_merge_formats(link->in_samplerates,
 464                                            link->out_samplerates,
 465                                            0, 1))
 466                         convert_needed = 1;
 467             }
 468
 469 #define MERGE_DISPATCH(field, statement)                                     \
 470             if (!(link->in_ ## field && link->out_ ## field)) {              \
 471                 count_delayed++;                                             \
 472             } else if (link->in_ ## field == link->out_ ## field) {          \
 473                 count_already_merged++;                                      \
 474             } else if (!convert_needed) {                                    \
 475                 count_merged++;                                              \
 476                 statement                                                    \
 477             }
 478
 479             if (link->type == AVMEDIA_TYPE_AUDIO) {
 480                 MERGE_DISPATCH(channel_layouts,
 481                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 482                                                   link->out_channel_layouts))
 483                         convert_needed = 1;
 484                 )
 485                 MERGE_DISPATCH(samplerates,
 486                     if (!ff_merge_samplerates(link->in_samplerates,
 487                                               link->out_samplerates))
 488                         convert_needed = 1;
 489                 )
 490             }
 491             MERGE_DISPATCH(formats,
 492                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 493                                       link->type))
 494                     convert_needed = 1;
 495             )
 496 #undef MERGE_DISPATCH
 497
 498             if (convert_needed) {
 499                 AVFilterContext *convert;
 500                 AVFilter *filter;
 501                 AVFilterLink *inlink, *outlink;
 502                 char scale_args[256];
 503                 char inst_name[30];
 504
 505                 /* couldn't merge format lists. auto-insert conversion filter */
 506                 switch (link->type) {
 507                 case AVMEDIA_TYPE_VIDEO:
 508                     if (!(filter = avfilter_get_by_name("scale"))) {
 509                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 510                                "not present, cannot convert pixel formats.\n");
 511                         return AVERROR(EINVAL);
 512                     }
 513
 514                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 515                              scaler_count++);
 516
 517                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 518                                                             inst_name, graph->scale_sws_opts, NULL,
 519                                                             graph)) < 0)
 520                         return ret;
 521                     break;
 522                 case AVMEDIA_TYPE_AUDIO:
 523                     if (!(filter = avfilter_get_by_name("aresample"))) {
 524                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 525                                "not present, cannot convert audio formats.\n");
 526                         return AVERROR(EINVAL);
 527                     }
 528
 529                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 530                              resampler_count++);
 531                     scale_args[0] = '\0';
 532                     if (graph->aresample_swr_opts)
 533                         snprintf(scale_args, sizeof(scale_args), "%s",
 534                                  graph->aresample_swr_opts);
 535                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 536                                                             inst_name, graph->aresample_swr_opts,
 537                                                             NULL, graph)) < 0)
 538                         return ret;
 539                     break;
 540                 default:
 541                     return AVERROR(EINVAL);
 542                 }
 543
 544                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 545                     return ret;
 546
 547                 if ((ret = filter_query_formats(convert)) < 0)
 548                     return ret;
 549
 550                 inlink  = convert->inputs[0];
 551                 outlink = convert->outputs[0];
 552                 av_assert0( inlink-> in_formats->refcount > 0);
 553                 av_assert0( inlink->out_formats->refcount > 0);
 554                 av_assert0(outlink-> in_formats->refcount > 0);
 555                 av_assert0(outlink->out_formats->refcount > 0);
 556                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 557                     av_assert0( inlink-> in_samplerates->refcount > 0);
 558                     av_assert0( inlink->out_samplerates->refcount > 0);
 559                     av_assert0(outlink-> in_samplerates->refcount > 0);
 560                     av_assert0(outlink->out_samplerates->refcount > 0);
 561                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
 562                     av_assert0( inlink->out_channel_layouts->refcount > 0);
 563                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
 564                     av_assert0(outlink->out_channel_layouts->refcount > 0);
 565                 }
 566                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 567                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 568                     ret = AVERROR(ENOSYS);
 569                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 570                     (!ff_merge_samplerates(inlink->in_samplerates,
 571                                            inlink->out_samplerates) ||
 572                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 573                                                inlink->out_channel_layouts)))
 574                     ret = AVERROR(ENOSYS);
 575                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 576                     (!ff_merge_samplerates(outlink->in_samplerates,
 577                                            outlink->out_samplerates) ||
 578                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 579                                                outlink->out_channel_layouts)))
 580                     ret = AVERROR(ENOSYS);
 581
 582                 if (ret < 0) {
 583                     av_log(log_ctx, AV_LOG_ERROR,
 584                            "Impossible to convert between the formats supported by the filter "
 585                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 586                     return ret;
 587                 }
 588             }
 589         }
 590     }
 591
 592     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 593            "%d queried, %d merged, %d already done, %d delayed\n",
 594            count_queried, count_merged, count_already_merged, count_delayed);
 595     if (count_delayed) {
 596         AVBPrint bp;
 597
 598         /* if count_queried > 0, one filter at least did set its formats,
 599            that will give additional information to its neighbour;
 600            if count_merged > 0, one pair of formats lists at least was merged,
 601            that will give additional information to all connected filters;
 602            in both cases, progress was made and a new round must be done */
 603         if (count_queried || count_merged)
 604             return AVERROR(EAGAIN);
 605         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 606         for (i = 0; i < graph->nb_filters; i++)
 607             if (!formats_declared(graph->filters[i]))
 608                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 609                           graph->filters[i]->name);
 610         av_log(graph, AV_LOG_ERROR,
 611                "The following filters could not choose their formats: %s\n"
 612                "Consider inserting the (a)format filter near their input or "
 613                "output.\n", bp.str);
 614         return AVERROR(EIO);
 615     }
 616     return 0;
 617 }
 618
 619 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 620 {
 621     int score = 0;
 622
 623     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 624         score ++;
 625
 626     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 627         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 628     }else
 629         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 630
 631     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 632         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 633         score += 20;
 634
 635     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 636         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 637         score += 2;
 638
 639     return score;
 640 }
 641
 642 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 643                                                      enum AVSampleFormat src_fmt)
 644 {
 645     int score1, score2;
 646
 647     score1 = get_fmt_score(dst_fmt1, src_fmt);
 648     score2 = get_fmt_score(dst_fmt2, src_fmt);
 649
 650     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 651 }
 652
 653 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 654 {
 655     if (!link || !link->in_formats)
 656         return 0;
 657
 658     if (link->type == AVMEDIA_TYPE_VIDEO) {
 659         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 660             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 661             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 662             int i;
 663             for (i=0; i<link->in_formats->nb_formats; i++) {
 664                 enum AVPixelFormat p = link->in_formats->formats[i];
 665                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 666             }
 667             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 668                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 669                    av_get_pix_fmt_name(ref->format), has_alpha);
 670             link->in_formats->formats[0] = best;
 671         }
 672     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 673         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 674             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 675             int i;
 676             for (i=0; i<link->in_formats->nb_formats; i++) {
 677                 enum AVSampleFormat p = link->in_formats->formats[i];
 678                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 679             }
 680             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 681                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
 682                    av_get_sample_fmt_name(ref->format));
 683             link->in_formats->formats[0] = best;
 684         }
 685     }
 686
 687     link->in_formats->nb_formats = 1;
 688     link->format = link->in_formats->formats[0];
 689
 690     if (link->type == AVMEDIA_TYPE_AUDIO) {
 691         if (!link->in_samplerates->nb_formats) {
 692             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 693                    " the link between filters %s and %s.\n", link->src->name,
 694                    link->dst->name);
 695             return AVERROR(EINVAL);
 696         }
 697         link->in_samplerates->nb_formats = 1;
 698         link->sample_rate = link->in_samplerates->formats[0];
 699
 700         if (link->in_channel_layouts->all_layouts) {
 701             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 702                    " the link between filters %s and %s.\n", link->src->name,
 703                    link->dst->name);
 704             if (!link->in_channel_layouts->all_counts)
 705                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 706                        "supported, try specifying a channel layout using "
 707                        "'aformat=channel_layouts=something'.\n");
 708             return AVERROR(EINVAL);
 709         }
 710         link->in_channel_layouts->nb_channel_layouts = 1;
 711         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 712         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 713             link->channel_layout = 0;
 714         else
 715             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 716     }
 717
 718     ff_formats_unref(&link->in_formats);
 719     ff_formats_unref(&link->out_formats);
 720     ff_formats_unref(&link->in_samplerates);
 721     ff_formats_unref(&link->out_samplerates);
 722     ff_channel_layouts_unref(&link->in_channel_layouts);
 723     ff_channel_layouts_unref(&link->out_channel_layouts);
 724
 725     return 0;
 726 }
 727
 728 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
 729 do {                                                                   \
 730     for (i = 0; i < filter->nb_inputs; i++) {                          \
 731         AVFilterLink *link = filter->inputs[i];                        \
 732         fmt_type fmt;                                                  \
 733                                                                        \
 734         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 735             continue;                                                  \
 736         fmt = link->out_ ## list->var[0];                              \
 737                                                                        \
 738         for (j = 0; j < filter->nb_outputs; j++) {                     \
 739             AVFilterLink *out_link = filter->outputs[j];               \
 740             list_type *fmts;                                           \
 741                                                                        \
 742             if (link->type != out_link->type ||                        \
 743                 out_link->in_ ## list->nb == 1)                        \
 744                 continue;                                              \
 745             fmts = out_link->in_ ## list;                              \
 746                                                                        \
 747             if (!out_link->in_ ## list->nb) {                          \
 748                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
 749                     return ret;                                        \
 750                 ret = 1;                                               \
 751                 break;                                                 \
 752             }                                                          \
 753                                                                        \
 754             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 755                 if (fmts->var[k] == fmt) {                             \
 756                     fmts->var[0]  = fmt;                               \
 757                     fmts->nb = 1;                                      \
 758                     ret = 1;                                           \
 759                     break;                                             \
 760                 }                                                      \
 761         }                                                              \
 762     }                                                                  \
 763 } while (0)
 764
 765 static int reduce_formats_on_filter(AVFilterContext *filter)
 766 {
 767     int i, j, k, ret = 0;
 768
 769     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 770                    nb_formats, ff_add_format, ff_formats_unref);
 771     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 772                    nb_formats, ff_add_format, ff_formats_unref);
 773
 774     /* reduce channel layouts */
 775     for (i = 0; i < filter->nb_inputs; i++) {
 776         AVFilterLink *inlink = filter->inputs[i];
 777         uint64_t fmt;
 778
 779         if (!inlink->out_channel_layouts ||
 780             inlink->out_channel_layouts->nb_channel_layouts != 1)
 781             continue;
 782         fmt = inlink->out_channel_layouts->channel_layouts[0];
 783
 784         for (j = 0; j < filter->nb_outputs; j++) {
 785             AVFilterLink *outlink = filter->outputs[j];
 786             AVFilterChannelLayouts *fmts;
 787
 788             fmts = outlink->in_channel_layouts;
 789             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 790                 continue;
 791
 792             if (fmts->all_layouts &&
 793                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 794                 /* Turn the infinite list into a singleton */
 795                 fmts->all_layouts = fmts->all_counts  = 0;
 796                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
 797                     ret = 1;
 798                 break;
 799             }
 800
 801             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 802                 if (fmts->channel_layouts[k] == fmt) {
 803                     fmts->channel_layouts[0]  = fmt;
 804                     fmts->nb_channel_layouts = 1;
 805                     ret = 1;
 806                     break;
 807                 }
 808             }
 809         }
 810     }
 811
 812     return ret;
 813 }
 814
 815 static int reduce_formats(AVFilterGraph *graph)
 816 {
 817     int i, reduced, ret;
 818
 819     do {
 820         reduced = 0;
 821
 822         for (i = 0; i < graph->nb_filters; i++) {
 823             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
 824                 return ret;
 825             reduced |= ret;
 826         }
 827     } while (reduced);
 828
 829     return 0;
 830 }
 831
 832 static void swap_samplerates_on_filter(AVFilterContext *filter)
 833 {
 834     AVFilterLink *link = NULL;
 835     int sample_rate;
 836     int i, j;
 837
 838     for (i = 0; i < filter->nb_inputs; i++) {
 839         link = filter->inputs[i];
 840
 841         if (link->type == AVMEDIA_TYPE_AUDIO &&
 842             link->out_samplerates->nb_formats== 1)
 843             break;
 844     }
 845     if (i == filter->nb_inputs)
 846         return;
 847
 848     sample_rate = link->out_samplerates->formats[0];
 849
 850     for (i = 0; i < filter->nb_outputs; i++) {
 851         AVFilterLink *outlink = filter->outputs[i];
 852         int best_idx, best_diff = INT_MAX;
 853
 854         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 855             outlink->in_samplerates->nb_formats < 2)
 856             continue;
 857
 858         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 859             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 860
 861             if (diff < best_diff) {
 862                 best_diff = diff;
 863                 best_idx  = j;
 864             }
 865         }
 866         FFSWAP(int, outlink->in_samplerates->formats[0],
 867                outlink->in_samplerates->formats[best_idx]);
 868     }
 869 }
 870
 871 static void swap_samplerates(AVFilterGraph *graph)
 872 {
 873     int i;
 874
 875     for (i = 0; i < graph->nb_filters; i++)
 876         swap_samplerates_on_filter(graph->filters[i]);
 877 }
 878
 879 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 880 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 881 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 882 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 883 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 884 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 885 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 886
 887 /* allowable substitutions for channel pairs when comparing layouts,
 888  * ordered by priority for both values */
 889 static const uint64_t ch_subst[][2] = {
 890     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 891     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 892     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 893     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 894     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 895     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 896     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 897     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 898     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 899     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 900     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 901     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 902     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 903     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 904     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 905     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 906     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 907     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 908     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 909     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 910     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 911 };
 912
 913 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 914 {
 915     AVFilterLink *link = NULL;
 916     int i, j, k;
 917
 918     for (i = 0; i < filter->nb_inputs; i++) {
 919         link = filter->inputs[i];
 920
 921         if (link->type == AVMEDIA_TYPE_AUDIO &&
 922             link->out_channel_layouts->nb_channel_layouts == 1)
 923             break;
 924     }
 925     if (i == filter->nb_inputs)
 926         return;
 927
 928     for (i = 0; i < filter->nb_outputs; i++) {
 929         AVFilterLink *outlink = filter->outputs[i];
 930         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 931
 932         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 933             outlink->in_channel_layouts->nb_channel_layouts < 2)
 934             continue;
 935
 936         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 937             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 938             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 939             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 940             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 941             int count_diff        = out_channels - in_channels;
 942             int matched_channels, extra_channels;
 943             int score = 100000;
 944
 945             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 946                 /* Compute score in case the input or output layout encodes
 947                    a channel count; in this case the score is not altered by
 948                    the computation afterwards, as in_chlayout and
 949                    out_chlayout have both been set to 0 */
 950                 if (FF_LAYOUT2COUNT(in_chlayout))
 951                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 952                 if (FF_LAYOUT2COUNT(out_chlayout))
 953                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 954                 score -= 10000 + FFABS(out_channels - in_channels) +
 955                          (in_channels > out_channels ? 10000 : 0);
 956                 in_chlayout = out_chlayout = 0;
 957                 /* Let the remaining computation run, even if the score
 958                    value is not altered */
 959             }
 960
 961             /* channel substitution */
 962             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 963                 uint64_t cmp0 = ch_subst[k][0];
 964                 uint64_t cmp1 = ch_subst[k][1];
 965                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 966                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 967                     in_chlayout  &= ~cmp0;
 968                     out_chlayout &= ~cmp1;
 969                     /* add score for channel match, minus a deduction for
 970                        having to do the substitution */
 971                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 972                 }
 973             }
 974
 975             /* no penalty for LFE channel mismatch */
 976             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 977                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 978                 score += 10;
 979             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 980             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 981
 982             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 983                                                                  out_chlayout);
 984             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 985                                                                  (~in_chlayout));
 986             score += 10 * matched_channels - 5 * extra_channels;
 987
 988             if (score > best_score ||
 989                 (count_diff < best_count_diff && score == best_score)) {
 990                 best_score = score;
 991                 best_idx   = j;
 992                 best_count_diff = count_diff;
 993             }
 994         }
 995         av_assert0(best_idx >= 0);
 996         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 997                outlink->in_channel_layouts->channel_layouts[best_idx]);
 998     }
 999
1000 }
1001
1002 static void swap_channel_layouts(AVFilterGraph *graph)
1003 {
1004     int i;
1005
1006     for (i = 0; i < graph->nb_filters; i++)
1007         swap_channel_layouts_on_filter(graph->filters[i]);
1008 }
1009
1010 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1011 {
1012     AVFilterLink *link = NULL;
1013     int format, bps;
1014     int i, j;
1015
1016     for (i = 0; i < filter->nb_inputs; i++) {
1017         link = filter->inputs[i];
1018
1019         if (link->type == AVMEDIA_TYPE_AUDIO &&
1020             link->out_formats->nb_formats == 1)
1021             break;
1022     }
1023     if (i == filter->nb_inputs)
1024         return;
1025
1026     format = link->out_formats->formats[0];
1027     bps    = av_get_bytes_per_sample(format);
1028
1029     for (i = 0; i < filter->nb_outputs; i++) {
1030         AVFilterLink *outlink = filter->outputs[i];
1031         int best_idx = -1, best_score = INT_MIN;
1032
1033         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1034             outlink->in_formats->nb_formats < 2)
1035             continue;
1036
1037         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1038             int out_format = outlink->in_formats->formats[j];
1039             int out_bps    = av_get_bytes_per_sample(out_format);
1040             int score;
1041
1042             if (av_get_packed_sample_fmt(out_format) == format ||
1043                 av_get_planar_sample_fmt(out_format) == format) {
1044                 best_idx   = j;
1045                 break;
1046             }
1047
1048             /* for s32 and float prefer double to prevent loss of information */
1049             if (bps == 4 && out_bps == 8) {
1050                 best_idx = j;
1051                 break;
1052             }
1053
1054             /* prefer closest higher or equal bps */
1055             score = -abs(out_bps - bps);
1056             if (out_bps >= bps)
1057                 score += INT_MAX/2;
1058
1059             if (score > best_score) {
1060                 best_score = score;
1061                 best_idx   = j;
1062             }
1063         }
1064         av_assert0(best_idx >= 0);
1065         FFSWAP(int, outlink->in_formats->formats[0],
1066                outlink->in_formats->formats[best_idx]);
1067     }
1068 }
1069
1070 static void swap_sample_fmts(AVFilterGraph *graph)
1071 {
1072     int i;
1073
1074     for (i = 0; i < graph->nb_filters; i++)
1075         swap_sample_fmts_on_filter(graph->filters[i]);
1076
1077 }
1078
1079 static int pick_formats(AVFilterGraph *graph)
1080 {
1081     int i, j, ret;
1082     int change;
1083
1084     do{
1085         change = 0;
1086         for (i = 0; i < graph->nb_filters; i++) {
1087             AVFilterContext *filter = graph->filters[i];
1088             if (filter->nb_inputs){
1089                 for (j = 0; j < filter->nb_inputs; j++){
1090                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1091                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1092                             return ret;
1093                         change = 1;
1094                     }
1095                 }
1096             }
1097             if (filter->nb_outputs){
1098                 for (j = 0; j < filter->nb_outputs; j++){
1099                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1100                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1101                             return ret;
1102                         change = 1;
1103                     }
1104                 }
1105             }
1106             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1107                 for (j = 0; j < filter->nb_outputs; j++) {
1108                     if(filter->outputs[j]->format<0) {
1109                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1110                             return ret;
1111                         change = 1;
1112                     }
1113                 }
1114             }
1115         }
1116     }while(change);
1117
1118     for (i = 0; i < graph->nb_filters; i++) {
1119         AVFilterContext *filter = graph->filters[i];
1120
1121         for (j = 0; j < filter->nb_inputs; j++)
1122             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1123                 return ret;
1124         for (j = 0; j < filter->nb_outputs; j++)
1125             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1126                 return ret;
1127     }
1128     return 0;
1129 }
1130
1131 /**
1132  * Configure the formats of all the links in the graph.
1133  */
1134 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1135 {
1136     int ret;
1137
1138     /* find supported formats from sub-filters, and merge along links */
1139     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1140         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1141     if (ret < 0)
1142         return ret;
1143
1144     /* Once everything is merged, it's possible that we'll still have
1145      * multiple valid media format choices. We try to minimize the amount
1146      * of format conversion inside filters */
1147     if ((ret = reduce_formats(graph)) < 0)
1148         return ret;
1149
1150     /* for audio filters, ensure the best format, sample rate and channel layout
1151      * is selected */
1152     swap_sample_fmts(graph);
1153     swap_samplerates(graph);
1154     swap_channel_layouts(graph);
1155
1156     if ((ret = pick_formats(graph)) < 0)
1157         return ret;
1158
1159     return 0;
1160 }
1161
1162 static int graph_config_pointers(AVFilterGraph *graph,
1163                                              AVClass *log_ctx)
1164 {
1165     unsigned i, j;
1166     int sink_links_count = 0, n = 0;
1167     AVFilterContext *f;
1168     AVFilterLink **sinks;
1169
1170     for (i = 0; i < graph->nb_filters; i++) {
1171         f = graph->filters[i];
1172         for (j = 0; j < f->nb_inputs; j++) {
1173             f->inputs[j]->graph     = graph;
1174             f->inputs[j]->age_index = -1;
1175         }
1176         for (j = 0; j < f->nb_outputs; j++) {
1177             f->outputs[j]->graph    = graph;
1178             f->outputs[j]->age_index= -1;
1179         }
1180         if (!f->nb_outputs) {
1181             if (f->nb_inputs > INT_MAX - sink_links_count)
1182                 return AVERROR(EINVAL);
1183             sink_links_count += f->nb_inputs;
1184         }
1185     }
1186     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1187     if (!sinks)
1188         return AVERROR(ENOMEM);
1189     for (i = 0; i < graph->nb_filters; i++) {
1190         f = graph->filters[i];
1191         if (!f->nb_outputs) {
1192             for (j = 0; j < f->nb_inputs; j++) {
1193                 sinks[n] = f->inputs[j];
1194                 f->inputs[j]->age_index = n++;
1195             }
1196         }
1197     }
1198     av_assert0(n == sink_links_count);
1199     graph->sink_links       = sinks;
1200     graph->sink_links_count = sink_links_count;
1201     return 0;
1202 }
1203
1204 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1205 {
1206     AVFilterContext *f;
1207     int i, j, ret;
1208     int fifo_count = 0;
1209
1210     for (i = 0; i < graph->nb_filters; i++) {
1211         f = graph->filters[i];
1212
1213         for (j = 0; j < f->nb_inputs; j++) {
1214             AVFilterLink *link = f->inputs[j];
1215             AVFilterContext *fifo_ctx;
1216             AVFilter *fifo;
1217             char name[32];
1218
1219             if (!link->dstpad->needs_fifo)
1220                 continue;
1221
1222             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1223                    avfilter_get_by_name("fifo") :
1224                    avfilter_get_by_name("afifo");
1225
1226             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1227
1228             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1229                                                NULL, graph);
1230             if (ret < 0)
1231                 return ret;
1232
1233             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1234             if (ret < 0)
1235                 return ret;
1236         }
1237     }
1238
1239     return 0;
1240 }
1241
1242 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1243 {
1244     int ret;
1245
1246     if ((ret = graph_check_validity(graphctx, log_ctx)))
1247         return ret;
1248     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1249         return ret;
1250     if ((ret = graph_config_formats(graphctx, log_ctx)))
1251         return ret;
1252     if ((ret = graph_config_links(graphctx, log_ctx)))
1253         return ret;
1254     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1255         return ret;
1256
1257     return 0;
1258 }
1259
1260 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1261 {
1262     int i, r = AVERROR(ENOSYS);
1263
1264     if (!graph)
1265         return r;
1266
1267     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1268         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1269         if (r != AVERROR(ENOSYS))
1270             return r;
1271     }
1272
1273     if (res_len && res)
1274         res[0] = 0;
1275
1276     for (i = 0; i < graph->nb_filters; i++) {
1277         AVFilterContext *filter = graph->filters[i];
1278         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1279             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1280             if (r != AVERROR(ENOSYS)) {
1281                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1282                     return r;
1283             }
1284         }
1285     }
1286
1287     return r;
1288 }
1289
1290 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1291 {
1292     int i;
1293
1294     if(!graph)
1295         return 0;
1296
1297     for (i = 0; i < graph->nb_filters; i++) {
1298         AVFilterContext *filter = graph->filters[i];
1299         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1300             AVFilterCommand **queue = &filter->command_queue, *next;
1301             while (*queue && (*queue)->time <= ts)
1302                 queue = &(*queue)->next;
1303             next = *queue;
1304             *queue = av_mallocz(sizeof(AVFilterCommand));
1305             (*queue)->command = av_strdup(command);
1306             (*queue)->arg     = av_strdup(arg);
1307             (*queue)->time    = ts;
1308             (*queue)->flags   = flags;
1309             (*queue)->next    = next;
1310             if(flags & AVFILTER_CMD_FLAG_ONE)
1311                 return 0;
1312         }
1313     }
1314
1315     return 0;
1316 }
1317
1318 static void heap_bubble_up(AVFilterGraph *graph,
1319                            AVFilterLink *link, int index)
1320 {
1321     AVFilterLink **links = graph->sink_links;
1322
1323     av_assert0(index >= 0);
1324
1325     while (index) {
1326         int parent = (index - 1) >> 1;
1327         if (links[parent]->current_pts_us >= link->current_pts_us)
1328             break;
1329         links[index] = links[parent];
1330         links[index]->age_index = index;
1331         index = parent;
1332     }
1333     links[index] = link;
1334     link->age_index = index;
1335 }
1336
1337 static void heap_bubble_down(AVFilterGraph *graph,
1338                              AVFilterLink *link, int index)
1339 {
1340     AVFilterLink **links = graph->sink_links;
1341
1342     av_assert0(index >= 0);
1343
1344     while (1) {
1345         int child = 2 * index + 1;
1346         if (child >= graph->sink_links_count)
1347             break;
1348         if (child + 1 < graph->sink_links_count &&
1349             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1350             child++;
1351         if (link->current_pts_us < links[child]->current_pts_us)
1352             break;
1353         links[index] = links[child];
1354         links[index]->age_index = index;
1355         index = child;
1356     }
1357     links[index] = link;
1358     link->age_index = index;
1359 }
1360
1361 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1362 {
1363     heap_bubble_up  (graph, link, link->age_index);
1364     heap_bubble_down(graph, link, link->age_index);
1365 }
1366
1367
1368 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1369 {
1370     while (graph->sink_links_count) {
1371         AVFilterLink *oldest = graph->sink_links[0];
1372         int r = ff_request_frame(oldest);
1373         if (r != AVERROR_EOF)
1374             return r;
1375         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1376                oldest->dst ? oldest->dst->name : "unknown",
1377                oldest->dstpad ? oldest->dstpad->name : "unknown");
1378         /* EOF: remove the link from the heap */
1379         if (oldest->age_index < --graph->sink_links_count)
1380             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1381                              oldest->age_index);
1382         oldest->age_index = -1;
1383     }
1384     return AVERROR_EOF;
1385 }