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 #define FF_INTERNAL_FIELDS 1
  36 #include "framequeue.h"
  37
  38 #include "avfilter.h"
  39 #include "buffersink.h"
  40 #include "formats.h"
  41 #include "internal.h"
  42 #include "thread.h"
  43
  44 #define OFFSET(x) offsetof(AVFilterGraph, x)
  45 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  46 static const AVOption filtergraph_options[] = {
  47     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  48         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
  49         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
  50     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  51         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
  52     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  53         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  54     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  55         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  56     { NULL },
  57 };
  58
  59 static const AVClass filtergraph_class = {
  60     .class_name = "AVFilterGraph",
  61     .item_name  = av_default_item_name,
  62     .version    = LIBAVUTIL_VERSION_INT,
  63     .option     = filtergraph_options,
  64     .category   = AV_CLASS_CATEGORY_FILTER,
  65 };
  66
  67 #if !HAVE_THREADS
  68 void ff_graph_thread_free(AVFilterGraph *graph)
  69 {
  70 }
  71
  72 int ff_graph_thread_init(AVFilterGraph *graph)
  73 {
  74     graph->thread_type = 0;
  75     graph->nb_threads  = 1;
  76     return 0;
  77 }
  78 #endif
  79
  80 AVFilterGraph *avfilter_graph_alloc(void)
  81 {
  82     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  83     if (!ret)
  84         return NULL;
  85
  86     ret->internal = av_mallocz(sizeof(*ret->internal));
  87     if (!ret->internal) {
  88         av_freep(&ret);
  89         return NULL;
  90     }
  91
  92     ret->av_class = &filtergraph_class;
  93     av_opt_set_defaults(ret);
  94     ff_framequeue_global_init(&ret->internal->frame_queues);
  95
  96     return ret;
  97 }
  98
  99 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
 100 {
 101     int i, j;
 102     for (i = 0; i < graph->nb_filters; i++) {
 103         if (graph->filters[i] == filter) {
 104             FFSWAP(AVFilterContext*, graph->filters[i],
 105                    graph->filters[graph->nb_filters - 1]);
 106             graph->nb_filters--;
 107             filter->graph = NULL;
 108             for (j = 0; j<filter->nb_outputs; j++)
 109                 if (filter->outputs[j])
 110                     filter->outputs[j]->graph = NULL;
 111
 112             return;
 113         }
 114     }
 115 }
 116
 117 void avfilter_graph_free(AVFilterGraph **graph)
 118 {
 119     if (!*graph)
 120         return;
 121
 122     while ((*graph)->nb_filters)
 123         avfilter_free((*graph)->filters[0]);
 124
 125     ff_graph_thread_free(*graph);
 126
 127     av_freep(&(*graph)->sink_links);
 128
 129     av_freep(&(*graph)->scale_sws_opts);
 130     av_freep(&(*graph)->aresample_swr_opts);
 131 #if FF_API_LAVR_OPTS
 132     av_freep(&(*graph)->resample_lavr_opts);
 133 #endif
 134     av_freep(&(*graph)->filters);
 135     av_freep(&(*graph)->internal);
 136     av_freep(graph);
 137 }
 138
 139 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 140                                  const char *name, const char *args, void *opaque,
 141                                  AVFilterGraph *graph_ctx)
 142 {
 143     int ret;
 144
 145     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 146     if (!*filt_ctx)
 147         return AVERROR(ENOMEM);
 148
 149     ret = avfilter_init_str(*filt_ctx, args);
 150     if (ret < 0)
 151         goto fail;
 152
 153     return 0;
 154
 155 fail:
 156     if (*filt_ctx)
 157         avfilter_free(*filt_ctx);
 158     *filt_ctx = NULL;
 159     return ret;
 160 }
 161
 162 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 163 {
 164     graph->disable_auto_convert = flags;
 165 }
 166
 167 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 168                                              const AVFilter *filter,
 169                                              const char *name)
 170 {
 171     AVFilterContext **filters, *s;
 172
 173     if (graph->thread_type && !graph->internal->thread_execute) {
 174         if (graph->execute) {
 175             graph->internal->thread_execute = graph->execute;
 176         } else {
 177             int ret = ff_graph_thread_init(graph);
 178             if (ret < 0) {
 179                 av_log(graph, AV_LOG_ERROR, "Error initializing threading: %s.\n", av_err2str(ret));
 180                 return NULL;
 181             }
 182         }
 183     }
 184
 185     s = ff_filter_alloc(filter, name);
 186     if (!s)
 187         return NULL;
 188
 189     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 190     if (!filters) {
 191         avfilter_free(s);
 192         return NULL;
 193     }
 194
 195     graph->filters = filters;
 196     graph->filters[graph->nb_filters++] = s;
 197
 198     s->graph = graph;
 199
 200     return s;
 201 }
 202
 203 /**
 204  * Check for the validity of graph.
 205  *
 206  * A graph is considered valid if all its input and output pads are
 207  * connected.
 208  *
 209  * @return >= 0 in case of success, a negative value otherwise
 210  */
 211 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 212 {
 213     AVFilterContext *filt;
 214     int i, j;
 215
 216     for (i = 0; i < graph->nb_filters; i++) {
 217         const AVFilterPad *pad;
 218         filt = graph->filters[i];
 219
 220         for (j = 0; j < filt->nb_inputs; j++) {
 221             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 222                 pad = &filt->input_pads[j];
 223                 av_log(log_ctx, AV_LOG_ERROR,
 224                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 225                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 226                 return AVERROR(EINVAL);
 227             }
 228         }
 229
 230         for (j = 0; j < filt->nb_outputs; j++) {
 231             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 232                 pad = &filt->output_pads[j];
 233                 av_log(log_ctx, AV_LOG_ERROR,
 234                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 235                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 236                 return AVERROR(EINVAL);
 237             }
 238         }
 239     }
 240
 241     return 0;
 242 }
 243
 244 /**
 245  * Configure all the links of graphctx.
 246  *
 247  * @return >= 0 in case of success, a negative value otherwise
 248  */
 249 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 250 {
 251     AVFilterContext *filt;
 252     int i, ret;
 253
 254     for (i = 0; i < graph->nb_filters; i++) {
 255         filt = graph->filters[i];
 256
 257         if (!filt->nb_outputs) {
 258             if ((ret = avfilter_config_links(filt)))
 259                 return ret;
 260         }
 261     }
 262
 263     return 0;
 264 }
 265
 266 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
 267 {
 268     int i;
 269
 270     for (i = 0; i < graph->nb_filters; i++)
 271         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 272             return graph->filters[i];
 273
 274     return NULL;
 275 }
 276
 277 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 278 {
 279     if (!l)
 280         return;
 281     if (l->nb_channel_layouts) {
 282         if (l->all_layouts || l->all_counts)
 283             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 284         l->all_layouts = l->all_counts = 0;
 285     } else {
 286         if (l->all_counts && !l->all_layouts)
 287             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 288         l->all_layouts = 1;
 289     }
 290 }
 291
 292 static int filter_query_formats(AVFilterContext *ctx)
 293 {
 294     int ret, i;
 295     AVFilterFormats *formats;
 296     AVFilterChannelLayouts *chlayouts;
 297     AVFilterFormats *samplerates;
 298     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 299                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 300                             AVMEDIA_TYPE_VIDEO;
 301
 302     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 303         if (ret != AVERROR(EAGAIN))
 304             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 305                    ctx->name, av_err2str(ret));
 306         return ret;
 307     }
 308
 309     for (i = 0; i < ctx->nb_inputs; i++)
 310         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 311     for (i = 0; i < ctx->nb_outputs; i++)
 312         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 313
 314     formats = ff_all_formats(type);
 315     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
 316         return ret;
 317     if (type == AVMEDIA_TYPE_AUDIO) {
 318         samplerates = ff_all_samplerates();
 319         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
 320             return ret;
 321         chlayouts = ff_all_channel_layouts();
 322         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
 323             return ret;
 324     }
 325     return 0;
 326 }
 327
 328 static int formats_declared(AVFilterContext *f)
 329 {
 330     int i;
 331
 332     for (i = 0; i < f->nb_inputs; i++) {
 333         if (!f->inputs[i]->out_formats)
 334             return 0;
 335         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 336             !(f->inputs[i]->out_samplerates &&
 337               f->inputs[i]->out_channel_layouts))
 338             return 0;
 339     }
 340     for (i = 0; i < f->nb_outputs; i++) {
 341         if (!f->outputs[i]->in_formats)
 342             return 0;
 343         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 344             !(f->outputs[i]->in_samplerates &&
 345               f->outputs[i]->in_channel_layouts))
 346             return 0;
 347     }
 348     return 1;
 349 }
 350
 351 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 352 {
 353     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 354     if (a) {
 355         a->refcount = 0;
 356         a->refs     = NULL;
 357         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 358         if (!a->formats && arg->formats)
 359             av_freep(&a);
 360     }
 361     return a;
 362 }
 363
 364 static int can_merge_formats(AVFilterFormats *a_arg,
 365                              AVFilterFormats *b_arg,
 366                              enum AVMediaType type,
 367                              int is_sample_rate)
 368 {
 369     AVFilterFormats *a, *b, *ret;
 370     if (a_arg == b_arg)
 371         return 1;
 372     a = clone_filter_formats(a_arg);
 373     b = clone_filter_formats(b_arg);
 374
 375     if (!a || !b) {
 376         if (a)
 377             av_freep(&a->formats);
 378         if (b)
 379             av_freep(&b->formats);
 380
 381         av_freep(&a);
 382         av_freep(&b);
 383
 384         return 0;
 385     }
 386
 387     if (is_sample_rate) {
 388         ret = ff_merge_samplerates(a, b);
 389     } else {
 390         ret = ff_merge_formats(a, b, type);
 391     }
 392     if (ret) {
 393         av_freep(&ret->formats);
 394         av_freep(&ret->refs);
 395         av_freep(&ret);
 396         return 1;
 397     } else {
 398         av_freep(&a->formats);
 399         av_freep(&b->formats);
 400         av_freep(&a);
 401         av_freep(&b);
 402         return 0;
 403     }
 404 }
 405
 406 /**
 407  * Perform one round of query_formats() and merging formats lists on the
 408  * filter graph.
 409  * @return  >=0 if all links formats lists could be queried and merged;
 410  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 411  *          and a later call may succeed;
 412  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 413  *          was made and the negotiation is stuck;
 414  *          a negative error code if some other error happened
 415  */
 416 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 417 {
 418     int i, j, ret;
 419     int scaler_count = 0, resampler_count = 0;
 420     int count_queried = 0;        /* successful calls to query_formats() */
 421     int count_merged = 0;         /* successful merge of formats lists */
 422     int count_already_merged = 0; /* lists already merged */
 423     int count_delayed = 0;        /* lists that need to be merged later */
 424
 425     for (i = 0; i < graph->nb_filters; i++) {
 426         AVFilterContext *f = graph->filters[i];
 427         if (formats_declared(f))
 428             continue;
 429         if (f->filter->query_formats)
 430             ret = filter_query_formats(f);
 431         else
 432             ret = ff_default_query_formats(f);
 433         if (ret < 0 && ret != AVERROR(EAGAIN))
 434             return ret;
 435         /* note: EAGAIN could indicate a partial success, not counted yet */
 436         count_queried += ret >= 0;
 437     }
 438
 439     /* go through and merge as many format lists as possible */
 440     for (i = 0; i < graph->nb_filters; i++) {
 441         AVFilterContext *filter = graph->filters[i];
 442
 443         for (j = 0; j < filter->nb_inputs; j++) {
 444             AVFilterLink *link = filter->inputs[j];
 445             int convert_needed = 0;
 446
 447             if (!link)
 448                 continue;
 449
 450             if (link->in_formats != link->out_formats
 451                 && link->in_formats && link->out_formats)
 452                 if (!can_merge_formats(link->in_formats, link->out_formats,
 453                                       link->type, 0))
 454                     convert_needed = 1;
 455             if (link->type == AVMEDIA_TYPE_AUDIO) {
 456                 if (link->in_samplerates != link->out_samplerates
 457                     && link->in_samplerates && link->out_samplerates)
 458                     if (!can_merge_formats(link->in_samplerates,
 459                                            link->out_samplerates,
 460                                            0, 1))
 461                         convert_needed = 1;
 462             }
 463
 464 #define MERGE_DISPATCH(field, statement)                                     \
 465             if (!(link->in_ ## field && link->out_ ## field)) {              \
 466                 count_delayed++;                                             \
 467             } else if (link->in_ ## field == link->out_ ## field) {          \
 468                 count_already_merged++;                                      \
 469             } else if (!convert_needed) {                                    \
 470                 count_merged++;                                              \
 471                 statement                                                    \
 472             }
 473
 474             if (link->type == AVMEDIA_TYPE_AUDIO) {
 475                 MERGE_DISPATCH(channel_layouts,
 476                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 477                                                   link->out_channel_layouts))
 478                         convert_needed = 1;
 479                 )
 480                 MERGE_DISPATCH(samplerates,
 481                     if (!ff_merge_samplerates(link->in_samplerates,
 482                                               link->out_samplerates))
 483                         convert_needed = 1;
 484                 )
 485             }
 486             MERGE_DISPATCH(formats,
 487                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 488                                       link->type))
 489                     convert_needed = 1;
 490             )
 491 #undef MERGE_DISPATCH
 492
 493             if (convert_needed) {
 494                 AVFilterContext *convert;
 495                 const AVFilter *filter;
 496                 AVFilterLink *inlink, *outlink;
 497                 char scale_args[256];
 498                 char inst_name[30];
 499
 500                 if (graph->disable_auto_convert) {
 501                     av_log(log_ctx, AV_LOG_ERROR,
 502                            "The filters '%s' and '%s' do not have a common format "
 503                            "and automatic conversion is disabled.\n",
 504                            link->src->name, link->dst->name);
 505                     return AVERROR(EINVAL);
 506                 }
 507
 508                 /* couldn't merge format lists. auto-insert conversion filter */
 509                 switch (link->type) {
 510                 case AVMEDIA_TYPE_VIDEO:
 511                     if (!(filter = avfilter_get_by_name("scale"))) {
 512                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 513                                "not present, cannot convert pixel formats.\n");
 514                         return AVERROR(EINVAL);
 515                     }
 516
 517                     snprintf(inst_name, sizeof(inst_name), "auto_scaler_%d",
 518                              scaler_count++);
 519
 520                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 521                                                             inst_name, graph->scale_sws_opts, NULL,
 522                                                             graph)) < 0)
 523                         return ret;
 524                     break;
 525                 case AVMEDIA_TYPE_AUDIO:
 526                     if (!(filter = avfilter_get_by_name("aresample"))) {
 527                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 528                                "not present, cannot convert audio formats.\n");
 529                         return AVERROR(EINVAL);
 530                     }
 531
 532                     snprintf(inst_name, sizeof(inst_name), "auto_resampler_%d",
 533                              resampler_count++);
 534                     scale_args[0] = '\0';
 535                     if (graph->aresample_swr_opts)
 536                         snprintf(scale_args, sizeof(scale_args), "%s",
 537                                  graph->aresample_swr_opts);
 538                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 539                                                             inst_name, graph->aresample_swr_opts,
 540                                                             NULL, graph)) < 0)
 541                         return ret;
 542                     break;
 543                 default:
 544                     return AVERROR(EINVAL);
 545                 }
 546
 547                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 548                     return ret;
 549
 550                 if ((ret = filter_query_formats(convert)) < 0)
 551                     return ret;
 552
 553                 inlink  = convert->inputs[0];
 554                 outlink = convert->outputs[0];
 555                 av_assert0( inlink-> in_formats->refcount > 0);
 556                 av_assert0( inlink->out_formats->refcount > 0);
 557                 av_assert0(outlink-> in_formats->refcount > 0);
 558                 av_assert0(outlink->out_formats->refcount > 0);
 559                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 560                     av_assert0( inlink-> in_samplerates->refcount > 0);
 561                     av_assert0( inlink->out_samplerates->refcount > 0);
 562                     av_assert0(outlink-> in_samplerates->refcount > 0);
 563                     av_assert0(outlink->out_samplerates->refcount > 0);
 564                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
 565                     av_assert0( inlink->out_channel_layouts->refcount > 0);
 566                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
 567                     av_assert0(outlink->out_channel_layouts->refcount > 0);
 568                 }
 569                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 570                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 571                     ret = AVERROR(ENOSYS);
 572                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 573                     (!ff_merge_samplerates(inlink->in_samplerates,
 574                                            inlink->out_samplerates) ||
 575                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 576                                                inlink->out_channel_layouts)))
 577                     ret = AVERROR(ENOSYS);
 578                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 579                     (!ff_merge_samplerates(outlink->in_samplerates,
 580                                            outlink->out_samplerates) ||
 581                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 582                                                outlink->out_channel_layouts)))
 583                     ret = AVERROR(ENOSYS);
 584
 585                 if (ret < 0) {
 586                     av_log(log_ctx, AV_LOG_ERROR,
 587                            "Impossible to convert between the formats supported by the filter "
 588                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 589                     return ret;
 590                 }
 591             }
 592         }
 593     }
 594
 595     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 596            "%d queried, %d merged, %d already done, %d delayed\n",
 597            count_queried, count_merged, count_already_merged, count_delayed);
 598     if (count_delayed) {
 599         AVBPrint bp;
 600
 601         /* if count_queried > 0, one filter at least did set its formats,
 602            that will give additional information to its neighbour;
 603            if count_merged > 0, one pair of formats lists at least was merged,
 604            that will give additional information to all connected filters;
 605            in both cases, progress was made and a new round must be done */
 606         if (count_queried || count_merged)
 607             return AVERROR(EAGAIN);
 608         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 609         for (i = 0; i < graph->nb_filters; i++)
 610             if (!formats_declared(graph->filters[i]))
 611                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 612                           graph->filters[i]->name);
 613         av_log(graph, AV_LOG_ERROR,
 614                "The following filters could not choose their formats: %s\n"
 615                "Consider inserting the (a)format filter near their input or "
 616                "output.\n", bp.str);
 617         return AVERROR(EIO);
 618     }
 619     return 0;
 620 }
 621
 622 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 623 {
 624     int score = 0;
 625
 626     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 627         score ++;
 628
 629     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 630         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 631     }else
 632         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 633
 634     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 635         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 636         score += 20;
 637
 638     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 639         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 640         score += 2;
 641
 642     return score;
 643 }
 644
 645 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 646                                                      enum AVSampleFormat src_fmt)
 647 {
 648     int score1, score2;
 649
 650     score1 = get_fmt_score(dst_fmt1, src_fmt);
 651     score2 = get_fmt_score(dst_fmt2, src_fmt);
 652
 653     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 654 }
 655
 656 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 657 {
 658     if (!link || !link->in_formats)
 659         return 0;
 660
 661     if (link->type == AVMEDIA_TYPE_VIDEO) {
 662         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 663             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 664             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 665             int i;
 666             for (i=0; i<link->in_formats->nb_formats; i++) {
 667                 enum AVPixelFormat p = link->in_formats->formats[i];
 668                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 669             }
 670             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 671                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 672                    av_get_pix_fmt_name(ref->format), has_alpha);
 673             link->in_formats->formats[0] = best;
 674         }
 675     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 676         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 677             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 678             int i;
 679             for (i=0; i<link->in_formats->nb_formats; i++) {
 680                 enum AVSampleFormat p = link->in_formats->formats[i];
 681                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 682             }
 683             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 684                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
 685                    av_get_sample_fmt_name(ref->format));
 686             link->in_formats->formats[0] = best;
 687         }
 688     }
 689
 690     link->in_formats->nb_formats = 1;
 691     link->format = link->in_formats->formats[0];
 692
 693     if (link->type == AVMEDIA_TYPE_AUDIO) {
 694         if (!link->in_samplerates->nb_formats) {
 695             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 696                    " the link between filters %s and %s.\n", link->src->name,
 697                    link->dst->name);
 698             return AVERROR(EINVAL);
 699         }
 700         link->in_samplerates->nb_formats = 1;
 701         link->sample_rate = link->in_samplerates->formats[0];
 702
 703         if (link->in_channel_layouts->all_layouts) {
 704             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 705                    " the link between filters %s and %s.\n", link->src->name,
 706                    link->dst->name);
 707             if (!link->in_channel_layouts->all_counts)
 708                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 709                        "supported, try specifying a channel layout using "
 710                        "'aformat=channel_layouts=something'.\n");
 711             return AVERROR(EINVAL);
 712         }
 713         link->in_channel_layouts->nb_channel_layouts = 1;
 714         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 715         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 716             link->channel_layout = 0;
 717         else
 718             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 719     }
 720
 721     ff_formats_unref(&link->in_formats);
 722     ff_formats_unref(&link->out_formats);
 723     ff_formats_unref(&link->in_samplerates);
 724     ff_formats_unref(&link->out_samplerates);
 725     ff_channel_layouts_unref(&link->in_channel_layouts);
 726     ff_channel_layouts_unref(&link->out_channel_layouts);
 727
 728     return 0;
 729 }
 730
 731 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
 732 do {                                                                   \
 733     for (i = 0; i < filter->nb_inputs; i++) {                          \
 734         AVFilterLink *link = filter->inputs[i];                        \
 735         fmt_type fmt;                                                  \
 736                                                                        \
 737         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 738             continue;                                                  \
 739         fmt = link->out_ ## list->var[0];                              \
 740                                                                        \
 741         for (j = 0; j < filter->nb_outputs; j++) {                     \
 742             AVFilterLink *out_link = filter->outputs[j];               \
 743             list_type *fmts;                                           \
 744                                                                        \
 745             if (link->type != out_link->type ||                        \
 746                 out_link->in_ ## list->nb == 1)                        \
 747                 continue;                                              \
 748             fmts = out_link->in_ ## list;                              \
 749                                                                        \
 750             if (!out_link->in_ ## list->nb) {                          \
 751                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
 752                     return ret;                                        \
 753                 ret = 1;                                               \
 754                 break;                                                 \
 755             }                                                          \
 756                                                                        \
 757             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 758                 if (fmts->var[k] == fmt) {                             \
 759                     fmts->var[0]  = fmt;                               \
 760                     fmts->nb = 1;                                      \
 761                     ret = 1;                                           \
 762                     break;                                             \
 763                 }                                                      \
 764         }                                                              \
 765     }                                                                  \
 766 } while (0)
 767
 768 static int reduce_formats_on_filter(AVFilterContext *filter)
 769 {
 770     int i, j, k, ret = 0;
 771
 772     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 773                    nb_formats, ff_add_format, ff_formats_unref);
 774     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 775                    nb_formats, ff_add_format, ff_formats_unref);
 776
 777     /* reduce channel layouts */
 778     for (i = 0; i < filter->nb_inputs; i++) {
 779         AVFilterLink *inlink = filter->inputs[i];
 780         uint64_t fmt;
 781
 782         if (!inlink->out_channel_layouts ||
 783             inlink->out_channel_layouts->nb_channel_layouts != 1)
 784             continue;
 785         fmt = inlink->out_channel_layouts->channel_layouts[0];
 786
 787         for (j = 0; j < filter->nb_outputs; j++) {
 788             AVFilterLink *outlink = filter->outputs[j];
 789             AVFilterChannelLayouts *fmts;
 790
 791             fmts = outlink->in_channel_layouts;
 792             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 793                 continue;
 794
 795             if (fmts->all_layouts &&
 796                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 797                 /* Turn the infinite list into a singleton */
 798                 fmts->all_layouts = fmts->all_counts  = 0;
 799                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
 800                     ret = 1;
 801                 break;
 802             }
 803
 804             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 805                 if (fmts->channel_layouts[k] == fmt) {
 806                     fmts->channel_layouts[0]  = fmt;
 807                     fmts->nb_channel_layouts = 1;
 808                     ret = 1;
 809                     break;
 810                 }
 811             }
 812         }
 813     }
 814
 815     return ret;
 816 }
 817
 818 static int reduce_formats(AVFilterGraph *graph)
 819 {
 820     int i, reduced, ret;
 821
 822     do {
 823         reduced = 0;
 824
 825         for (i = 0; i < graph->nb_filters; i++) {
 826             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
 827                 return ret;
 828             reduced |= ret;
 829         }
 830     } while (reduced);
 831
 832     return 0;
 833 }
 834
 835 static void swap_samplerates_on_filter(AVFilterContext *filter)
 836 {
 837     AVFilterLink *link = NULL;
 838     int sample_rate;
 839     int i, j;
 840
 841     for (i = 0; i < filter->nb_inputs; i++) {
 842         link = filter->inputs[i];
 843
 844         if (link->type == AVMEDIA_TYPE_AUDIO &&
 845             link->out_samplerates->nb_formats== 1)
 846             break;
 847     }
 848     if (i == filter->nb_inputs)
 849         return;
 850
 851     sample_rate = link->out_samplerates->formats[0];
 852
 853     for (i = 0; i < filter->nb_outputs; i++) {
 854         AVFilterLink *outlink = filter->outputs[i];
 855         int best_idx, best_diff = INT_MAX;
 856
 857         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 858             outlink->in_samplerates->nb_formats < 2)
 859             continue;
 860
 861         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 862             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 863
 864             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
 865
 866             if (diff < best_diff) {
 867                 best_diff = diff;
 868                 best_idx  = j;
 869             }
 870         }
 871         FFSWAP(int, outlink->in_samplerates->formats[0],
 872                outlink->in_samplerates->formats[best_idx]);
 873     }
 874 }
 875
 876 static void swap_samplerates(AVFilterGraph *graph)
 877 {
 878     int i;
 879
 880     for (i = 0; i < graph->nb_filters; i++)
 881         swap_samplerates_on_filter(graph->filters[i]);
 882 }
 883
 884 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 885 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 886 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 887 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 888 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 889 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 890 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 891
 892 /* allowable substitutions for channel pairs when comparing layouts,
 893  * ordered by priority for both values */
 894 static const uint64_t ch_subst[][2] = {
 895     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 896     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 897     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 898     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 899     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 900     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 901     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 902     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 903     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 904     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 905     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 906     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 907     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 908     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 909     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 910     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 911     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 912     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 913     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 914     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 915     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 916 };
 917
 918 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 919 {
 920     AVFilterLink *link = NULL;
 921     int i, j, k;
 922
 923     for (i = 0; i < filter->nb_inputs; i++) {
 924         link = filter->inputs[i];
 925
 926         if (link->type == AVMEDIA_TYPE_AUDIO &&
 927             link->out_channel_layouts->nb_channel_layouts == 1)
 928             break;
 929     }
 930     if (i == filter->nb_inputs)
 931         return;
 932
 933     for (i = 0; i < filter->nb_outputs; i++) {
 934         AVFilterLink *outlink = filter->outputs[i];
 935         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 936
 937         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 938             outlink->in_channel_layouts->nb_channel_layouts < 2)
 939             continue;
 940
 941         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 942             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 943             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 944             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 945             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 946             int count_diff        = out_channels - in_channels;
 947             int matched_channels, extra_channels;
 948             int score = 100000;
 949
 950             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 951                 /* Compute score in case the input or output layout encodes
 952                    a channel count; in this case the score is not altered by
 953                    the computation afterwards, as in_chlayout and
 954                    out_chlayout have both been set to 0 */
 955                 if (FF_LAYOUT2COUNT(in_chlayout))
 956                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 957                 if (FF_LAYOUT2COUNT(out_chlayout))
 958                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 959                 score -= 10000 + FFABS(out_channels - in_channels) +
 960                          (in_channels > out_channels ? 10000 : 0);
 961                 in_chlayout = out_chlayout = 0;
 962                 /* Let the remaining computation run, even if the score
 963                    value is not altered */
 964             }
 965
 966             /* channel substitution */
 967             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 968                 uint64_t cmp0 = ch_subst[k][0];
 969                 uint64_t cmp1 = ch_subst[k][1];
 970                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 971                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 972                     in_chlayout  &= ~cmp0;
 973                     out_chlayout &= ~cmp1;
 974                     /* add score for channel match, minus a deduction for
 975                        having to do the substitution */
 976                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 977                 }
 978             }
 979
 980             /* no penalty for LFE channel mismatch */
 981             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 982                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 983                 score += 10;
 984             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 985             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 986
 987             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 988                                                                  out_chlayout);
 989             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 990                                                                  (~in_chlayout));
 991             score += 10 * matched_channels - 5 * extra_channels;
 992
 993             if (score > best_score ||
 994                 (count_diff < best_count_diff && score == best_score)) {
 995                 best_score = score;
 996                 best_idx   = j;
 997                 best_count_diff = count_diff;
 998             }
 999         }
1000         av_assert0(best_idx >= 0);
1001         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1002                outlink->in_channel_layouts->channel_layouts[best_idx]);
1003     }
1004
1005 }
1006
1007 static void swap_channel_layouts(AVFilterGraph *graph)
1008 {
1009     int i;
1010
1011     for (i = 0; i < graph->nb_filters; i++)
1012         swap_channel_layouts_on_filter(graph->filters[i]);
1013 }
1014
1015 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1016 {
1017     AVFilterLink *link = NULL;
1018     int format, bps;
1019     int i, j;
1020
1021     for (i = 0; i < filter->nb_inputs; i++) {
1022         link = filter->inputs[i];
1023
1024         if (link->type == AVMEDIA_TYPE_AUDIO &&
1025             link->out_formats->nb_formats == 1)
1026             break;
1027     }
1028     if (i == filter->nb_inputs)
1029         return;
1030
1031     format = link->out_formats->formats[0];
1032     bps    = av_get_bytes_per_sample(format);
1033
1034     for (i = 0; i < filter->nb_outputs; i++) {
1035         AVFilterLink *outlink = filter->outputs[i];
1036         int best_idx = -1, best_score = INT_MIN;
1037
1038         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1039             outlink->in_formats->nb_formats < 2)
1040             continue;
1041
1042         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1043             int out_format = outlink->in_formats->formats[j];
1044             int out_bps    = av_get_bytes_per_sample(out_format);
1045             int score;
1046
1047             if (av_get_packed_sample_fmt(out_format) == format ||
1048                 av_get_planar_sample_fmt(out_format) == format) {
1049                 best_idx   = j;
1050                 break;
1051             }
1052
1053             /* for s32 and float prefer double to prevent loss of information */
1054             if (bps == 4 && out_bps == 8) {
1055                 best_idx = j;
1056                 break;
1057             }
1058
1059             /* prefer closest higher or equal bps */
1060             score = -abs(out_bps - bps);
1061             if (out_bps >= bps)
1062                 score += INT_MAX/2;
1063
1064             if (score > best_score) {
1065                 best_score = score;
1066                 best_idx   = j;
1067             }
1068         }
1069         av_assert0(best_idx >= 0);
1070         FFSWAP(int, outlink->in_formats->formats[0],
1071                outlink->in_formats->formats[best_idx]);
1072     }
1073 }
1074
1075 static void swap_sample_fmts(AVFilterGraph *graph)
1076 {
1077     int i;
1078
1079     for (i = 0; i < graph->nb_filters; i++)
1080         swap_sample_fmts_on_filter(graph->filters[i]);
1081
1082 }
1083
1084 static int pick_formats(AVFilterGraph *graph)
1085 {
1086     int i, j, ret;
1087     int change;
1088
1089     do{
1090         change = 0;
1091         for (i = 0; i < graph->nb_filters; i++) {
1092             AVFilterContext *filter = graph->filters[i];
1093             if (filter->nb_inputs){
1094                 for (j = 0; j < filter->nb_inputs; j++){
1095                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1096                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1097                             return ret;
1098                         change = 1;
1099                     }
1100                 }
1101             }
1102             if (filter->nb_outputs){
1103                 for (j = 0; j < filter->nb_outputs; j++){
1104                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1105                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1106                             return ret;
1107                         change = 1;
1108                     }
1109                 }
1110             }
1111             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1112                 for (j = 0; j < filter->nb_outputs; j++) {
1113                     if(filter->outputs[j]->format<0) {
1114                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1115                             return ret;
1116                         change = 1;
1117                     }
1118                 }
1119             }
1120         }
1121     }while(change);
1122
1123     for (i = 0; i < graph->nb_filters; i++) {
1124         AVFilterContext *filter = graph->filters[i];
1125
1126         for (j = 0; j < filter->nb_inputs; j++)
1127             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1128                 return ret;
1129         for (j = 0; j < filter->nb_outputs; j++)
1130             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1131                 return ret;
1132     }
1133     return 0;
1134 }
1135
1136 /**
1137  * Configure the formats of all the links in the graph.
1138  */
1139 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1140 {
1141     int ret;
1142
1143     /* find supported formats from sub-filters, and merge along links */
1144     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1145         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1146     if (ret < 0)
1147         return ret;
1148
1149     /* Once everything is merged, it's possible that we'll still have
1150      * multiple valid media format choices. We try to minimize the amount
1151      * of format conversion inside filters */
1152     if ((ret = reduce_formats(graph)) < 0)
1153         return ret;
1154
1155     /* for audio filters, ensure the best format, sample rate and channel layout
1156      * is selected */
1157     swap_sample_fmts(graph);
1158     swap_samplerates(graph);
1159     swap_channel_layouts(graph);
1160
1161     if ((ret = pick_formats(graph)) < 0)
1162         return ret;
1163
1164     return 0;
1165 }
1166
1167 static int graph_config_pointers(AVFilterGraph *graph,
1168                                              AVClass *log_ctx)
1169 {
1170     unsigned i, j;
1171     int sink_links_count = 0, n = 0;
1172     AVFilterContext *f;
1173     AVFilterLink **sinks;
1174
1175     for (i = 0; i < graph->nb_filters; i++) {
1176         f = graph->filters[i];
1177         for (j = 0; j < f->nb_inputs; j++) {
1178             f->inputs[j]->graph     = graph;
1179             f->inputs[j]->age_index = -1;
1180         }
1181         for (j = 0; j < f->nb_outputs; j++) {
1182             f->outputs[j]->graph    = graph;
1183             f->outputs[j]->age_index= -1;
1184         }
1185         if (!f->nb_outputs) {
1186             if (f->nb_inputs > INT_MAX - sink_links_count)
1187                 return AVERROR(EINVAL);
1188             sink_links_count += f->nb_inputs;
1189         }
1190     }
1191     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1192     if (!sinks)
1193         return AVERROR(ENOMEM);
1194     for (i = 0; i < graph->nb_filters; i++) {
1195         f = graph->filters[i];
1196         if (!f->nb_outputs) {
1197             for (j = 0; j < f->nb_inputs; j++) {
1198                 sinks[n] = f->inputs[j];
1199                 f->inputs[j]->age_index = n++;
1200             }
1201         }
1202     }
1203     av_assert0(n == sink_links_count);
1204     graph->sink_links       = sinks;
1205     graph->sink_links_count = sink_links_count;
1206     return 0;
1207 }
1208
1209 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1210 {
1211     AVFilterContext *f;
1212     int i, j, ret;
1213     int fifo_count = 0;
1214
1215     for (i = 0; i < graph->nb_filters; i++) {
1216         f = graph->filters[i];
1217
1218         for (j = 0; j < f->nb_inputs; j++) {
1219             AVFilterLink *link = f->inputs[j];
1220             AVFilterContext *fifo_ctx;
1221             const AVFilter *fifo;
1222             char name[32];
1223
1224             if (!link->dstpad->needs_fifo)
1225                 continue;
1226
1227             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1228                    avfilter_get_by_name("fifo") :
1229                    avfilter_get_by_name("afifo");
1230
1231             snprintf(name, sizeof(name), "auto_fifo_%d", fifo_count++);
1232
1233             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1234                                                NULL, graph);
1235             if (ret < 0)
1236                 return ret;
1237
1238             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1239             if (ret < 0)
1240                 return ret;
1241         }
1242     }
1243
1244     return 0;
1245 }
1246
1247 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1248 {
1249     int ret;
1250
1251     if ((ret = graph_check_validity(graphctx, log_ctx)))
1252         return ret;
1253     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1254         return ret;
1255     if ((ret = graph_config_formats(graphctx, log_ctx)))
1256         return ret;
1257     if ((ret = graph_config_links(graphctx, log_ctx)))
1258         return ret;
1259     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1260         return ret;
1261
1262     return 0;
1263 }
1264
1265 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1266 {
1267     int i, r = AVERROR(ENOSYS);
1268
1269     if (!graph)
1270         return r;
1271
1272     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1273         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1274         if (r != AVERROR(ENOSYS))
1275             return r;
1276     }
1277
1278     if (res_len && res)
1279         res[0] = 0;
1280
1281     for (i = 0; i < graph->nb_filters; i++) {
1282         AVFilterContext *filter = graph->filters[i];
1283         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1284             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1285             if (r != AVERROR(ENOSYS)) {
1286                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1287                     return r;
1288             }
1289         }
1290     }
1291
1292     return r;
1293 }
1294
1295 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1296 {
1297     int i;
1298
1299     if(!graph)
1300         return 0;
1301
1302     for (i = 0; i < graph->nb_filters; i++) {
1303         AVFilterContext *filter = graph->filters[i];
1304         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1305             AVFilterCommand **queue = &filter->command_queue, *next;
1306             while (*queue && (*queue)->time <= ts)
1307                 queue = &(*queue)->next;
1308             next = *queue;
1309             *queue = av_mallocz(sizeof(AVFilterCommand));
1310             if (!*queue)
1311                 return AVERROR(ENOMEM);
1312
1313             (*queue)->command = av_strdup(command);
1314             (*queue)->arg     = av_strdup(arg);
1315             (*queue)->time    = ts;
1316             (*queue)->flags   = flags;
1317             (*queue)->next    = next;
1318             if(flags & AVFILTER_CMD_FLAG_ONE)
1319                 return 0;
1320         }
1321     }
1322
1323     return 0;
1324 }
1325
1326 static void heap_bubble_up(AVFilterGraph *graph,
1327                            AVFilterLink *link, int index)
1328 {
1329     AVFilterLink **links = graph->sink_links;
1330
1331     av_assert0(index >= 0);
1332
1333     while (index) {
1334         int parent = (index - 1) >> 1;
1335         if (links[parent]->current_pts_us >= link->current_pts_us)
1336             break;
1337         links[index] = links[parent];
1338         links[index]->age_index = index;
1339         index = parent;
1340     }
1341     links[index] = link;
1342     link->age_index = index;
1343 }
1344
1345 static void heap_bubble_down(AVFilterGraph *graph,
1346                              AVFilterLink *link, int index)
1347 {
1348     AVFilterLink **links = graph->sink_links;
1349
1350     av_assert0(index >= 0);
1351
1352     while (1) {
1353         int child = 2 * index + 1;
1354         if (child >= graph->sink_links_count)
1355             break;
1356         if (child + 1 < graph->sink_links_count &&
1357             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1358             child++;
1359         if (link->current_pts_us < links[child]->current_pts_us)
1360             break;
1361         links[index] = links[child];
1362         links[index]->age_index = index;
1363         index = child;
1364     }
1365     links[index] = link;
1366     link->age_index = index;
1367 }
1368
1369 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1370 {
1371     heap_bubble_up  (graph, link, link->age_index);
1372     heap_bubble_down(graph, link, link->age_index);
1373 }
1374
1375 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1376 {
1377     AVFilterLink *oldest = graph->sink_links[0];
1378     int64_t frame_count;
1379     int r;
1380
1381     while (graph->sink_links_count) {
1382         oldest = graph->sink_links[0];
1383         if (oldest->dst->filter->activate) {
1384             /* For now, buffersink is the only filter implementing activate. */
1385             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1386                                               AV_BUFFERSINK_FLAG_PEEK);
1387             if (r != AVERROR_EOF)
1388                 return r;
1389         } else {
1390             r = ff_request_frame(oldest);
1391         }
1392         if (r != AVERROR_EOF)
1393             break;
1394         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1395                oldest->dst ? oldest->dst->name : "unknown",
1396                oldest->dstpad ? oldest->dstpad->name : "unknown");
1397         /* EOF: remove the link from the heap */
1398         if (oldest->age_index < --graph->sink_links_count)
1399             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1400                              oldest->age_index);
1401         oldest->age_index = -1;
1402     }
1403     if (!graph->sink_links_count)
1404         return AVERROR_EOF;
1405     av_assert1(!oldest->dst->filter->activate);
1406     av_assert1(oldest->age_index >= 0);
1407     frame_count = oldest->frame_count_out;
1408     while (frame_count == oldest->frame_count_out) {
1409         r = ff_filter_graph_run_once(graph);
1410         if (r == AVERROR(EAGAIN) &&
1411             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1412             !oldest->status_in)
1413             ff_request_frame(oldest);
1414         else if (r < 0)
1415             return r;
1416     }
1417     return 0;
1418 }
1419
1420 int ff_filter_graph_run_once(AVFilterGraph *graph)
1421 {
1422     AVFilterContext *filter;
1423     unsigned i;
1424
1425     av_assert0(graph->nb_filters);
1426     filter = graph->filters[0];
1427     for (i = 1; i < graph->nb_filters; i++)
1428         if (graph->filters[i]->ready > filter->ready)
1429             filter = graph->filters[i];
1430     if (!filter->ready)
1431         return AVERROR(EAGAIN);
1432     return ff_filter_activate(filter);
1433 }