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, j;
  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             filter->graph = NULL;
 103             for (j = 0; j<filter->nb_outputs; j++)
 104                 if (filter->outputs[j])
 105                     filter->outputs[j]->graph = NULL;
 106
 107             return;
 108         }
 109     }
 110 }
 111
 112 void avfilter_graph_free(AVFilterGraph **graph)
 113 {
 114     if (!*graph)
 115         return;
 116
 117     while ((*graph)->nb_filters)
 118         avfilter_free((*graph)->filters[0]);
 119
 120     ff_graph_thread_free(*graph);
 121
 122     av_freep(&(*graph)->sink_links);
 123
 124     av_freep(&(*graph)->scale_sws_opts);
 125     av_freep(&(*graph)->aresample_swr_opts);
 126     av_freep(&(*graph)->resample_lavr_opts);
 127     av_freep(&(*graph)->filters);
 128     av_freep(&(*graph)->internal);
 129     av_freep(graph);
 130 }
 131
 132 #if FF_API_AVFILTER_OPEN
 133 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 134 {
 135     AVFilterContext **filters = av_realloc(graph->filters,
 136                                            sizeof(*filters) * (graph->nb_filters + 1));
 137     if (!filters)
 138         return AVERROR(ENOMEM);
 139
 140     graph->filters = filters;
 141     graph->filters[graph->nb_filters++] = filter;
 142
 143     filter->graph = graph;
 144
 145     return 0;
 146 }
 147 #endif
 148
 149 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 150                                  const char *name, const char *args, void *opaque,
 151                                  AVFilterGraph *graph_ctx)
 152 {
 153     int ret;
 154
 155     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 156     if (!*filt_ctx)
 157         return AVERROR(ENOMEM);
 158
 159     ret = avfilter_init_str(*filt_ctx, args);
 160     if (ret < 0)
 161         goto fail;
 162
 163     return 0;
 164
 165 fail:
 166     if (*filt_ctx)
 167         avfilter_free(*filt_ctx);
 168     *filt_ctx = NULL;
 169     return ret;
 170 }
 171
 172 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 173 {
 174     graph->disable_auto_convert = flags;
 175 }
 176
 177 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 178                                              const AVFilter *filter,
 179                                              const char *name)
 180 {
 181     AVFilterContext **filters, *s;
 182
 183     if (graph->thread_type && !graph->internal->thread_execute) {
 184         if (graph->execute) {
 185             graph->internal->thread_execute = graph->execute;
 186         } else {
 187             int ret = ff_graph_thread_init(graph);
 188             if (ret < 0) {
 189                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
 190                 return NULL;
 191             }
 192         }
 193     }
 194
 195     s = ff_filter_alloc(filter, name);
 196     if (!s)
 197         return NULL;
 198
 199     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 200     if (!filters) {
 201         avfilter_free(s);
 202         return NULL;
 203     }
 204
 205     graph->filters = filters;
 206     graph->filters[graph->nb_filters++] = s;
 207
 208     s->graph = graph;
 209
 210     return s;
 211 }
 212
 213 /**
 214  * Check for the validity of graph.
 215  *
 216  * A graph is considered valid if all its input and output pads are
 217  * connected.
 218  *
 219  * @return >= 0 in case of success, a negative value otherwise
 220  */
 221 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 222 {
 223     AVFilterContext *filt;
 224     int i, j;
 225
 226     for (i = 0; i < graph->nb_filters; i++) {
 227         const AVFilterPad *pad;
 228         filt = graph->filters[i];
 229
 230         for (j = 0; j < filt->nb_inputs; j++) {
 231             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 232                 pad = &filt->input_pads[j];
 233                 av_log(log_ctx, AV_LOG_ERROR,
 234                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 235                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 236                 return AVERROR(EINVAL);
 237             }
 238         }
 239
 240         for (j = 0; j < filt->nb_outputs; j++) {
 241             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 242                 pad = &filt->output_pads[j];
 243                 av_log(log_ctx, AV_LOG_ERROR,
 244                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 245                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 246                 return AVERROR(EINVAL);
 247             }
 248         }
 249     }
 250
 251     return 0;
 252 }
 253
 254 /**
 255  * Configure all the links of graphctx.
 256  *
 257  * @return >= 0 in case of success, a negative value otherwise
 258  */
 259 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 260 {
 261     AVFilterContext *filt;
 262     int i, ret;
 263
 264     for (i = 0; i < graph->nb_filters; i++) {
 265         filt = graph->filters[i];
 266
 267         if (!filt->nb_outputs) {
 268             if ((ret = avfilter_config_links(filt)))
 269                 return ret;
 270         }
 271     }
 272
 273     return 0;
 274 }
 275
 276 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
 277 {
 278     int i;
 279
 280     for (i = 0; i < graph->nb_filters; i++)
 281         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 282             return graph->filters[i];
 283
 284     return NULL;
 285 }
 286
 287 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 288 {
 289     if (!l)
 290         return;
 291     if (l->nb_channel_layouts) {
 292         if (l->all_layouts || l->all_counts)
 293             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 294         l->all_layouts = l->all_counts = 0;
 295     } else {
 296         if (l->all_counts && !l->all_layouts)
 297             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 298         l->all_layouts = 1;
 299     }
 300 }
 301
 302 static int filter_query_formats(AVFilterContext *ctx)
 303 {
 304     int ret, i;
 305     AVFilterFormats *formats;
 306     AVFilterChannelLayouts *chlayouts;
 307     AVFilterFormats *samplerates;
 308     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 309                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 310                             AVMEDIA_TYPE_VIDEO;
 311
 312     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 313         if (ret != AVERROR(EAGAIN))
 314             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 315                    ctx->name, av_err2str(ret));
 316         return ret;
 317     }
 318
 319     for (i = 0; i < ctx->nb_inputs; i++)
 320         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 321     for (i = 0; i < ctx->nb_outputs; i++)
 322         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 323
 324     formats = ff_all_formats(type);
 325     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
 326         return ret;
 327     if (type == AVMEDIA_TYPE_AUDIO) {
 328         samplerates = ff_all_samplerates();
 329         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
 330             return ret;
 331         chlayouts = ff_all_channel_layouts();
 332         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
 333             return ret;
 334     }
 335     return 0;
 336 }
 337
 338 static int formats_declared(AVFilterContext *f)
 339 {
 340     int i;
 341
 342     for (i = 0; i < f->nb_inputs; i++) {
 343         if (!f->inputs[i]->out_formats)
 344             return 0;
 345         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 346             !(f->inputs[i]->out_samplerates &&
 347               f->inputs[i]->out_channel_layouts))
 348             return 0;
 349     }
 350     for (i = 0; i < f->nb_outputs; i++) {
 351         if (!f->outputs[i]->in_formats)
 352             return 0;
 353         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 354             !(f->outputs[i]->in_samplerates &&
 355               f->outputs[i]->in_channel_layouts))
 356             return 0;
 357     }
 358     return 1;
 359 }
 360
 361 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 362 {
 363     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 364     if (a) {
 365         a->refcount = 0;
 366         a->refs     = NULL;
 367         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 368         if (!a->formats && arg->formats)
 369             av_freep(&a);
 370     }
 371     return a;
 372 }
 373
 374 static int can_merge_formats(AVFilterFormats *a_arg,
 375                              AVFilterFormats *b_arg,
 376                              enum AVMediaType type,
 377                              int is_sample_rate)
 378 {
 379     AVFilterFormats *a, *b, *ret;
 380     if (a_arg == b_arg)
 381         return 1;
 382     a = clone_filter_formats(a_arg);
 383     b = clone_filter_formats(b_arg);
 384
 385     if (!a || !b) {
 386         if (a)
 387             av_freep(&a->formats);
 388         if (b)
 389             av_freep(&b->formats);
 390
 391         av_freep(&a);
 392         av_freep(&b);
 393
 394         return 0;
 395     }
 396
 397     if (is_sample_rate) {
 398         ret = ff_merge_samplerates(a, b);
 399     } else {
 400         ret = ff_merge_formats(a, b, type);
 401     }
 402     if (ret) {
 403         av_freep(&ret->formats);
 404         av_freep(&ret->refs);
 405         av_freep(&ret);
 406         return 1;
 407     } else {
 408         av_freep(&a->formats);
 409         av_freep(&b->formats);
 410         av_freep(&a);
 411         av_freep(&b);
 412         return 0;
 413     }
 414 }
 415
 416 /**
 417  * Perform one round of query_formats() and merging formats lists on the
 418  * filter graph.
 419  * @return  >=0 if all links formats lists could be queried and merged;
 420  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 421  *          and a later call may succeed;
 422  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 423  *          was made and the negotiation is stuck;
 424  *          a negative error code if some other error happened
 425  */
 426 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 427 {
 428     int i, j, ret;
 429     int scaler_count = 0, resampler_count = 0;
 430     int count_queried = 0;        /* successful calls to query_formats() */
 431     int count_merged = 0;         /* successful merge of formats lists */
 432     int count_already_merged = 0; /* lists already merged */
 433     int count_delayed = 0;        /* lists that need to be merged later */
 434
 435     for (i = 0; i < graph->nb_filters; i++) {
 436         AVFilterContext *f = graph->filters[i];
 437         if (formats_declared(f))
 438             continue;
 439         if (f->filter->query_formats)
 440             ret = filter_query_formats(f);
 441         else
 442             ret = ff_default_query_formats(f);
 443         if (ret < 0 && ret != AVERROR(EAGAIN))
 444             return ret;
 445         /* note: EAGAIN could indicate a partial success, not counted yet */
 446         count_queried += ret >= 0;
 447     }
 448
 449     /* go through and merge as many format lists as possible */
 450     for (i = 0; i < graph->nb_filters; i++) {
 451         AVFilterContext *filter = graph->filters[i];
 452
 453         for (j = 0; j < filter->nb_inputs; j++) {
 454             AVFilterLink *link = filter->inputs[j];
 455             int convert_needed = 0;
 456
 457             if (!link)
 458                 continue;
 459
 460             if (link->in_formats != link->out_formats
 461                 && link->in_formats && link->out_formats)
 462                 if (!can_merge_formats(link->in_formats, link->out_formats,
 463                                       link->type, 0))
 464                     convert_needed = 1;
 465             if (link->type == AVMEDIA_TYPE_AUDIO) {
 466                 if (link->in_samplerates != link->out_samplerates
 467                     && link->in_samplerates && link->out_samplerates)
 468                     if (!can_merge_formats(link->in_samplerates,
 469                                            link->out_samplerates,
 470                                            0, 1))
 471                         convert_needed = 1;
 472             }
 473
 474 #define MERGE_DISPATCH(field, statement)                                     \
 475             if (!(link->in_ ## field && link->out_ ## field)) {              \
 476                 count_delayed++;                                             \
 477             } else if (link->in_ ## field == link->out_ ## field) {          \
 478                 count_already_merged++;                                      \
 479             } else if (!convert_needed) {                                    \
 480                 count_merged++;                                              \
 481                 statement                                                    \
 482             }
 483
 484             if (link->type == AVMEDIA_TYPE_AUDIO) {
 485                 MERGE_DISPATCH(channel_layouts,
 486                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 487                                                   link->out_channel_layouts))
 488                         convert_needed = 1;
 489                 )
 490                 MERGE_DISPATCH(samplerates,
 491                     if (!ff_merge_samplerates(link->in_samplerates,
 492                                               link->out_samplerates))
 493                         convert_needed = 1;
 494                 )
 495             }
 496             MERGE_DISPATCH(formats,
 497                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 498                                       link->type))
 499                     convert_needed = 1;
 500             )
 501 #undef MERGE_DISPATCH
 502
 503             if (convert_needed) {
 504                 AVFilterContext *convert;
 505                 AVFilter *filter;
 506                 AVFilterLink *inlink, *outlink;
 507                 char scale_args[256];
 508                 char inst_name[30];
 509
 510                 /* couldn't merge format lists. auto-insert conversion filter */
 511                 switch (link->type) {
 512                 case AVMEDIA_TYPE_VIDEO:
 513                     if (!(filter = avfilter_get_by_name("scale"))) {
 514                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 515                                "not present, cannot convert pixel formats.\n");
 516                         return AVERROR(EINVAL);
 517                     }
 518
 519                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 520                              scaler_count++);
 521
 522                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 523                                                             inst_name, graph->scale_sws_opts, NULL,
 524                                                             graph)) < 0)
 525                         return ret;
 526                     break;
 527                 case AVMEDIA_TYPE_AUDIO:
 528                     if (!(filter = avfilter_get_by_name("aresample"))) {
 529                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 530                                "not present, cannot convert audio formats.\n");
 531                         return AVERROR(EINVAL);
 532                     }
 533
 534                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 535                              resampler_count++);
 536                     scale_args[0] = '\0';
 537                     if (graph->aresample_swr_opts)
 538                         snprintf(scale_args, sizeof(scale_args), "%s",
 539                                  graph->aresample_swr_opts);
 540                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 541                                                             inst_name, graph->aresample_swr_opts,
 542                                                             NULL, graph)) < 0)
 543                         return ret;
 544                     break;
 545                 default:
 546                     return AVERROR(EINVAL);
 547                 }
 548
 549                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 550                     return ret;
 551
 552                 if ((ret = filter_query_formats(convert)) < 0)
 553                     return ret;
 554
 555                 inlink  = convert->inputs[0];
 556                 outlink = convert->outputs[0];
 557                 av_assert0( inlink-> in_formats->refcount > 0);
 558                 av_assert0( inlink->out_formats->refcount > 0);
 559                 av_assert0(outlink-> in_formats->refcount > 0);
 560                 av_assert0(outlink->out_formats->refcount > 0);
 561                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 562                     av_assert0( inlink-> in_samplerates->refcount > 0);
 563                     av_assert0( inlink->out_samplerates->refcount > 0);
 564                     av_assert0(outlink-> in_samplerates->refcount > 0);
 565                     av_assert0(outlink->out_samplerates->refcount > 0);
 566                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
 567                     av_assert0( inlink->out_channel_layouts->refcount > 0);
 568                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
 569                     av_assert0(outlink->out_channel_layouts->refcount > 0);
 570                 }
 571                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 572                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 573                     ret = AVERROR(ENOSYS);
 574                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 575                     (!ff_merge_samplerates(inlink->in_samplerates,
 576                                            inlink->out_samplerates) ||
 577                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 578                                                inlink->out_channel_layouts)))
 579                     ret = AVERROR(ENOSYS);
 580                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 581                     (!ff_merge_samplerates(outlink->in_samplerates,
 582                                            outlink->out_samplerates) ||
 583                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 584                                                outlink->out_channel_layouts)))
 585                     ret = AVERROR(ENOSYS);
 586
 587                 if (ret < 0) {
 588                     av_log(log_ctx, AV_LOG_ERROR,
 589                            "Impossible to convert between the formats supported by the filter "
 590                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 591                     return ret;
 592                 }
 593             }
 594         }
 595     }
 596
 597     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 598            "%d queried, %d merged, %d already done, %d delayed\n",
 599            count_queried, count_merged, count_already_merged, count_delayed);
 600     if (count_delayed) {
 601         AVBPrint bp;
 602
 603         /* if count_queried > 0, one filter at least did set its formats,
 604            that will give additional information to its neighbour;
 605            if count_merged > 0, one pair of formats lists at least was merged,
 606            that will give additional information to all connected filters;
 607            in both cases, progress was made and a new round must be done */
 608         if (count_queried || count_merged)
 609             return AVERROR(EAGAIN);
 610         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 611         for (i = 0; i < graph->nb_filters; i++)
 612             if (!formats_declared(graph->filters[i]))
 613                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 614                           graph->filters[i]->name);
 615         av_log(graph, AV_LOG_ERROR,
 616                "The following filters could not choose their formats: %s\n"
 617                "Consider inserting the (a)format filter near their input or "
 618                "output.\n", bp.str);
 619         return AVERROR(EIO);
 620     }
 621     return 0;
 622 }
 623
 624 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 625 {
 626     int score = 0;
 627
 628     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 629         score ++;
 630
 631     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 632         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 633     }else
 634         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 635
 636     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 637         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 638         score += 20;
 639
 640     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 641         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 642         score += 2;
 643
 644     return score;
 645 }
 646
 647 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 648                                                      enum AVSampleFormat src_fmt)
 649 {
 650     int score1, score2;
 651
 652     score1 = get_fmt_score(dst_fmt1, src_fmt);
 653     score2 = get_fmt_score(dst_fmt2, src_fmt);
 654
 655     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 656 }
 657
 658 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 659 {
 660     if (!link || !link->in_formats)
 661         return 0;
 662
 663     if (link->type == AVMEDIA_TYPE_VIDEO) {
 664         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 665             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 666             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 667             int i;
 668             for (i=0; i<link->in_formats->nb_formats; i++) {
 669                 enum AVPixelFormat p = link->in_formats->formats[i];
 670                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 671             }
 672             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 673                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 674                    av_get_pix_fmt_name(ref->format), has_alpha);
 675             link->in_formats->formats[0] = best;
 676         }
 677     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 678         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 679             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 680             int i;
 681             for (i=0; i<link->in_formats->nb_formats; i++) {
 682                 enum AVSampleFormat p = link->in_formats->formats[i];
 683                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 684             }
 685             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 686                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
 687                    av_get_sample_fmt_name(ref->format));
 688             link->in_formats->formats[0] = best;
 689         }
 690     }
 691
 692     link->in_formats->nb_formats = 1;
 693     link->format = link->in_formats->formats[0];
 694
 695     if (link->type == AVMEDIA_TYPE_AUDIO) {
 696         if (!link->in_samplerates->nb_formats) {
 697             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 698                    " the link between filters %s and %s.\n", link->src->name,
 699                    link->dst->name);
 700             return AVERROR(EINVAL);
 701         }
 702         link->in_samplerates->nb_formats = 1;
 703         link->sample_rate = link->in_samplerates->formats[0];
 704
 705         if (link->in_channel_layouts->all_layouts) {
 706             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 707                    " the link between filters %s and %s.\n", link->src->name,
 708                    link->dst->name);
 709             if (!link->in_channel_layouts->all_counts)
 710                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 711                        "supported, try specifying a channel layout using "
 712                        "'aformat=channel_layouts=something'.\n");
 713             return AVERROR(EINVAL);
 714         }
 715         link->in_channel_layouts->nb_channel_layouts = 1;
 716         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 717         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 718             link->channel_layout = 0;
 719         else
 720             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 721     }
 722
 723     ff_formats_unref(&link->in_formats);
 724     ff_formats_unref(&link->out_formats);
 725     ff_formats_unref(&link->in_samplerates);
 726     ff_formats_unref(&link->out_samplerates);
 727     ff_channel_layouts_unref(&link->in_channel_layouts);
 728     ff_channel_layouts_unref(&link->out_channel_layouts);
 729
 730     return 0;
 731 }
 732
 733 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
 734 do {                                                                   \
 735     for (i = 0; i < filter->nb_inputs; i++) {                          \
 736         AVFilterLink *link = filter->inputs[i];                        \
 737         fmt_type fmt;                                                  \
 738                                                                        \
 739         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 740             continue;                                                  \
 741         fmt = link->out_ ## list->var[0];                              \
 742                                                                        \
 743         for (j = 0; j < filter->nb_outputs; j++) {                     \
 744             AVFilterLink *out_link = filter->outputs[j];               \
 745             list_type *fmts;                                           \
 746                                                                        \
 747             if (link->type != out_link->type ||                        \
 748                 out_link->in_ ## list->nb == 1)                        \
 749                 continue;                                              \
 750             fmts = out_link->in_ ## list;                              \
 751                                                                        \
 752             if (!out_link->in_ ## list->nb) {                          \
 753                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
 754                     return ret;                                        \
 755                 ret = 1;                                               \
 756                 break;                                                 \
 757             }                                                          \
 758                                                                        \
 759             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 760                 if (fmts->var[k] == fmt) {                             \
 761                     fmts->var[0]  = fmt;                               \
 762                     fmts->nb = 1;                                      \
 763                     ret = 1;                                           \
 764                     break;                                             \
 765                 }                                                      \
 766         }                                                              \
 767     }                                                                  \
 768 } while (0)
 769
 770 static int reduce_formats_on_filter(AVFilterContext *filter)
 771 {
 772     int i, j, k, ret = 0;
 773
 774     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 775                    nb_formats, ff_add_format, ff_formats_unref);
 776     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 777                    nb_formats, ff_add_format, ff_formats_unref);
 778
 779     /* reduce channel layouts */
 780     for (i = 0; i < filter->nb_inputs; i++) {
 781         AVFilterLink *inlink = filter->inputs[i];
 782         uint64_t fmt;
 783
 784         if (!inlink->out_channel_layouts ||
 785             inlink->out_channel_layouts->nb_channel_layouts != 1)
 786             continue;
 787         fmt = inlink->out_channel_layouts->channel_layouts[0];
 788
 789         for (j = 0; j < filter->nb_outputs; j++) {
 790             AVFilterLink *outlink = filter->outputs[j];
 791             AVFilterChannelLayouts *fmts;
 792
 793             fmts = outlink->in_channel_layouts;
 794             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 795                 continue;
 796
 797             if (fmts->all_layouts &&
 798                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 799                 /* Turn the infinite list into a singleton */
 800                 fmts->all_layouts = fmts->all_counts  = 0;
 801                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
 802                     ret = 1;
 803                 break;
 804             }
 805
 806             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 807                 if (fmts->channel_layouts[k] == fmt) {
 808                     fmts->channel_layouts[0]  = fmt;
 809                     fmts->nb_channel_layouts = 1;
 810                     ret = 1;
 811                     break;
 812                 }
 813             }
 814         }
 815     }
 816
 817     return ret;
 818 }
 819
 820 static int reduce_formats(AVFilterGraph *graph)
 821 {
 822     int i, reduced, ret;
 823
 824     do {
 825         reduced = 0;
 826
 827         for (i = 0; i < graph->nb_filters; i++) {
 828             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
 829                 return ret;
 830             reduced |= ret;
 831         }
 832     } while (reduced);
 833
 834     return 0;
 835 }
 836
 837 static void swap_samplerates_on_filter(AVFilterContext *filter)
 838 {
 839     AVFilterLink *link = NULL;
 840     int sample_rate;
 841     int i, j;
 842
 843     for (i = 0; i < filter->nb_inputs; i++) {
 844         link = filter->inputs[i];
 845
 846         if (link->type == AVMEDIA_TYPE_AUDIO &&
 847             link->out_samplerates->nb_formats== 1)
 848             break;
 849     }
 850     if (i == filter->nb_inputs)
 851         return;
 852
 853     sample_rate = link->out_samplerates->formats[0];
 854
 855     for (i = 0; i < filter->nb_outputs; i++) {
 856         AVFilterLink *outlink = filter->outputs[i];
 857         int best_idx, best_diff = INT_MAX;
 858
 859         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 860             outlink->in_samplerates->nb_formats < 2)
 861             continue;
 862
 863         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 864             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 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             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-inserted 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             (*queue)->command = av_strdup(command);
1311             (*queue)->arg     = av_strdup(arg);
1312             (*queue)->time    = ts;
1313             (*queue)->flags   = flags;
1314             (*queue)->next    = next;
1315             if(flags & AVFILTER_CMD_FLAG_ONE)
1316                 return 0;
1317         }
1318     }
1319
1320     return 0;
1321 }
1322
1323 static void heap_bubble_up(AVFilterGraph *graph,
1324                            AVFilterLink *link, int index)
1325 {
1326     AVFilterLink **links = graph->sink_links;
1327
1328     av_assert0(index >= 0);
1329
1330     while (index) {
1331         int parent = (index - 1) >> 1;
1332         if (links[parent]->current_pts_us >= link->current_pts_us)
1333             break;
1334         links[index] = links[parent];
1335         links[index]->age_index = index;
1336         index = parent;
1337     }
1338     links[index] = link;
1339     link->age_index = index;
1340 }
1341
1342 static void heap_bubble_down(AVFilterGraph *graph,
1343                              AVFilterLink *link, int index)
1344 {
1345     AVFilterLink **links = graph->sink_links;
1346
1347     av_assert0(index >= 0);
1348
1349     while (1) {
1350         int child = 2 * index + 1;
1351         if (child >= graph->sink_links_count)
1352             break;
1353         if (child + 1 < graph->sink_links_count &&
1354             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1355             child++;
1356         if (link->current_pts_us < links[child]->current_pts_us)
1357             break;
1358         links[index] = links[child];
1359         links[index]->age_index = index;
1360         index = child;
1361     }
1362     links[index] = link;
1363     link->age_index = index;
1364 }
1365
1366 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1367 {
1368     heap_bubble_up  (graph, link, link->age_index);
1369     heap_bubble_down(graph, link, link->age_index);
1370 }
1371
1372
1373 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1374 {
1375     AVFilterLink *oldest = graph->sink_links[0];
1376     int r;
1377
1378     while (graph->sink_links_count) {
1379         oldest = graph->sink_links[0];
1380         r = ff_request_frame(oldest);
1381         if (r != AVERROR_EOF)
1382             break;
1383         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1384                oldest->dst ? oldest->dst->name : "unknown",
1385                oldest->dstpad ? oldest->dstpad->name : "unknown");
1386         /* EOF: remove the link from the heap */
1387         if (oldest->age_index < --graph->sink_links_count)
1388             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1389                              oldest->age_index);
1390         oldest->age_index = -1;
1391     }
1392     if (!graph->sink_links_count)
1393         return AVERROR_EOF;
1394     av_assert1(oldest->age_index >= 0);
1395     while (oldest->frame_wanted_out) {
1396         r = ff_filter_graph_run_once(graph);
1397         if (r < 0)
1398             return r;
1399     }
1400     return 0;
1401 }
1402
1403 static AVFilterLink *graph_run_once_find_filter(AVFilterGraph *graph)
1404 {
1405     unsigned i, j;
1406     AVFilterContext *f;
1407
1408     /* TODO: replace scanning the graph with a priority list */
1409     for (i = 0; i < graph->nb_filters; i++) {
1410         f = graph->filters[i];
1411         for (j = 0; j < f->nb_outputs; j++)
1412             if (f->outputs[j]->frame_wanted_in)
1413                 return f->outputs[j];
1414     }
1415     for (i = 0; i < graph->nb_filters; i++) {
1416         f = graph->filters[i];
1417         for (j = 0; j < f->nb_outputs; j++)
1418             if (f->outputs[j]->frame_wanted_out)
1419                 return f->outputs[j];
1420     }
1421     return NULL;
1422 }
1423
1424 int ff_filter_graph_run_once(AVFilterGraph *graph)
1425 {
1426     AVFilterLink *link;
1427     int ret;
1428
1429     link = graph_run_once_find_filter(graph);
1430     if (!link) {
1431         av_log(NULL, AV_LOG_WARNING, "Useless run of a filter graph\n");
1432         return AVERROR(EAGAIN);
1433     }
1434     ret = ff_request_frame_to_filter(link);
1435     if (ret == AVERROR_EOF)
1436         /* local EOF will be forwarded through request_frame() /
1437            set_status() until it reaches the sink */
1438         ret = 0;
1439     return ret < 0 ? ret : 1;
1440 }