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/imgutils.h"
  32 #include "libavutil/internal.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/pixdesc.h"
  35
  36 #define FF_INTERNAL_FIELDS 1
  37 #include "framequeue.h"
  38
  39 #include "avfilter.h"
  40 #include "buffersink.h"
  41 #include "formats.h"
  42 #include "internal.h"
  43 #include "thread.h"
  44
  45 #define OFFSET(x) offsetof(AVFilterGraph, x)
  46 #define F AV_OPT_FLAG_FILTERING_PARAM
  47 #define V AV_OPT_FLAG_VIDEO_PARAM
  48 #define A AV_OPT_FLAG_AUDIO_PARAM
  49 static const AVOption filtergraph_options[] = {
  50     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  51         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, F|V|A, "thread_type" },
  52         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = F|V|A, .unit = "thread_type" },
  53     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  54         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, F|V|A },
  55     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  56         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|V },
  57     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  58         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|A },
  59     { NULL },
  60 };
  61
  62 static const AVClass filtergraph_class = {
  63     .class_name = "AVFilterGraph",
  64     .item_name  = av_default_item_name,
  65     .version    = LIBAVUTIL_VERSION_INT,
  66     .option     = filtergraph_options,
  67     .category   = AV_CLASS_CATEGORY_FILTER,
  68 };
  69
  70 #if !HAVE_THREADS
  71 void ff_graph_thread_free(AVFilterGraph *graph)
  72 {
  73 }
  74
  75 int ff_graph_thread_init(AVFilterGraph *graph)
  76 {
  77     graph->thread_type = 0;
  78     graph->nb_threads  = 1;
  79     return 0;
  80 }
  81 #endif
  82
  83 AVFilterGraph *avfilter_graph_alloc(void)
  84 {
  85     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  86     if (!ret)
  87         return NULL;
  88
  89     ret->internal = av_mallocz(sizeof(*ret->internal));
  90     if (!ret->internal) {
  91         av_freep(&ret);
  92         return NULL;
  93     }
  94
  95     ret->av_class = &filtergraph_class;
  96     av_opt_set_defaults(ret);
  97     ff_framequeue_global_init(&ret->internal->frame_queues);
  98
  99     return ret;
 100 }
 101
 102 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
 103 {
 104     int i, j;
 105     for (i = 0; i < graph->nb_filters; i++) {
 106         if (graph->filters[i] == filter) {
 107             FFSWAP(AVFilterContext*, graph->filters[i],
 108                    graph->filters[graph->nb_filters - 1]);
 109             graph->nb_filters--;
 110             filter->graph = NULL;
 111             for (j = 0; j<filter->nb_outputs; j++)
 112                 if (filter->outputs[j])
 113                     filter->outputs[j]->graph = NULL;
 114
 115             return;
 116         }
 117     }
 118 }
 119
 120 void avfilter_graph_free(AVFilterGraph **graph)
 121 {
 122     if (!*graph)
 123         return;
 124
 125     while ((*graph)->nb_filters)
 126         avfilter_free((*graph)->filters[0]);
 127
 128     ff_graph_thread_free(*graph);
 129
 130     av_freep(&(*graph)->sink_links);
 131
 132     av_freep(&(*graph)->scale_sws_opts);
 133     av_freep(&(*graph)->aresample_swr_opts);
 134 #if FF_API_LAVR_OPTS
 135     av_freep(&(*graph)->resample_lavr_opts);
 136 #endif
 137     av_freep(&(*graph)->filters);
 138     av_freep(&(*graph)->internal);
 139     av_freep(graph);
 140 }
 141
 142 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 143                                  const char *name, const char *args, void *opaque,
 144                                  AVFilterGraph *graph_ctx)
 145 {
 146     int ret;
 147
 148     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 149     if (!*filt_ctx)
 150         return AVERROR(ENOMEM);
 151
 152     ret = avfilter_init_str(*filt_ctx, args);
 153     if (ret < 0)
 154         goto fail;
 155
 156     return 0;
 157
 158 fail:
 159     if (*filt_ctx)
 160         avfilter_free(*filt_ctx);
 161     *filt_ctx = NULL;
 162     return ret;
 163 }
 164
 165 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 166 {
 167     graph->disable_auto_convert = flags;
 168 }
 169
 170 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 171                                              const AVFilter *filter,
 172                                              const char *name)
 173 {
 174     AVFilterContext **filters, *s;
 175
 176     if (graph->thread_type && !graph->internal->thread_execute) {
 177         if (graph->execute) {
 178             graph->internal->thread_execute = graph->execute;
 179         } else {
 180             int ret = ff_graph_thread_init(graph);
 181             if (ret < 0) {
 182                 av_log(graph, AV_LOG_ERROR, "Error initializing threading: %s.\n", av_err2str(ret));
 183                 return NULL;
 184             }
 185         }
 186     }
 187
 188     s = ff_filter_alloc(filter, name);
 189     if (!s)
 190         return NULL;
 191
 192     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 193     if (!filters) {
 194         avfilter_free(s);
 195         return NULL;
 196     }
 197
 198     graph->filters = filters;
 199     graph->filters[graph->nb_filters++] = s;
 200
 201     s->graph = graph;
 202
 203     return s;
 204 }
 205
 206 /**
 207  * Check for the validity of graph.
 208  *
 209  * A graph is considered valid if all its input and output pads are
 210  * connected.
 211  *
 212  * @return >= 0 in case of success, a negative value otherwise
 213  */
 214 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 215 {
 216     AVFilterContext *filt;
 217     int i, j;
 218
 219     for (i = 0; i < graph->nb_filters; i++) {
 220         const AVFilterPad *pad;
 221         filt = graph->filters[i];
 222
 223         for (j = 0; j < filt->nb_inputs; j++) {
 224             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 225                 pad = &filt->input_pads[j];
 226                 av_log(log_ctx, AV_LOG_ERROR,
 227                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 228                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 229                 return AVERROR(EINVAL);
 230             }
 231         }
 232
 233         for (j = 0; j < filt->nb_outputs; j++) {
 234             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 235                 pad = &filt->output_pads[j];
 236                 av_log(log_ctx, AV_LOG_ERROR,
 237                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 238                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 239                 return AVERROR(EINVAL);
 240             }
 241         }
 242     }
 243
 244     return 0;
 245 }
 246
 247 /**
 248  * Configure all the links of graphctx.
 249  *
 250  * @return >= 0 in case of success, a negative value otherwise
 251  */
 252 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 253 {
 254     AVFilterContext *filt;
 255     int i, ret;
 256
 257     for (i = 0; i < graph->nb_filters; i++) {
 258         filt = graph->filters[i];
 259
 260         if (!filt->nb_outputs) {
 261             if ((ret = avfilter_config_links(filt)))
 262                 return ret;
 263         }
 264     }
 265
 266     return 0;
 267 }
 268
 269 static int graph_check_links(AVFilterGraph *graph, AVClass *log_ctx)
 270 {
 271     AVFilterContext *f;
 272     AVFilterLink *l;
 273     unsigned i, j;
 274     int ret;
 275
 276     for (i = 0; i < graph->nb_filters; i++) {
 277         f = graph->filters[i];
 278         for (j = 0; j < f->nb_outputs; j++) {
 279             l = f->outputs[j];
 280             if (l->type == AVMEDIA_TYPE_VIDEO) {
 281                 ret = av_image_check_size2(l->w, l->h, INT64_MAX, l->format, 0, f);
 282                 if (ret < 0)
 283                     return ret;
 284             }
 285         }
 286     }
 287     return 0;
 288 }
 289
 290 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
 291 {
 292     int i;
 293
 294     for (i = 0; i < graph->nb_filters; i++)
 295         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 296             return graph->filters[i];
 297
 298     return NULL;
 299 }
 300
 301 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 302 {
 303     if (!l)
 304         return;
 305     if (l->nb_channel_layouts) {
 306         if (l->all_layouts || l->all_counts)
 307             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 308         l->all_layouts = l->all_counts = 0;
 309     } else {
 310         if (l->all_counts && !l->all_layouts)
 311             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 312         l->all_layouts = 1;
 313     }
 314 }
 315
 316 static int filter_query_formats(AVFilterContext *ctx)
 317 {
 318     int ret, i;
 319     AVFilterFormats *formats;
 320     AVFilterChannelLayouts *chlayouts;
 321     AVFilterFormats *samplerates;
 322     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 323                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 324                             AVMEDIA_TYPE_VIDEO;
 325
 326     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 327         if (ret != AVERROR(EAGAIN))
 328             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 329                    ctx->name, av_err2str(ret));
 330         return ret;
 331     }
 332
 333     for (i = 0; i < ctx->nb_inputs; i++)
 334         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 335     for (i = 0; i < ctx->nb_outputs; i++)
 336         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 337
 338     formats = ff_all_formats(type);
 339     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
 340         return ret;
 341     if (type == AVMEDIA_TYPE_AUDIO) {
 342         samplerates = ff_all_samplerates();
 343         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
 344             return ret;
 345         chlayouts = ff_all_channel_layouts();
 346         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
 347             return ret;
 348     }
 349     return 0;
 350 }
 351
 352 static int formats_declared(AVFilterContext *f)
 353 {
 354     int i;
 355
 356     for (i = 0; i < f->nb_inputs; i++) {
 357         if (!f->inputs[i]->out_formats)
 358             return 0;
 359         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 360             !(f->inputs[i]->out_samplerates &&
 361               f->inputs[i]->out_channel_layouts))
 362             return 0;
 363     }
 364     for (i = 0; i < f->nb_outputs; i++) {
 365         if (!f->outputs[i]->in_formats)
 366             return 0;
 367         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 368             !(f->outputs[i]->in_samplerates &&
 369               f->outputs[i]->in_channel_layouts))
 370             return 0;
 371     }
 372     return 1;
 373 }
 374
 375 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 376 {
 377     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 378     if (a) {
 379         a->refcount = 0;
 380         a->refs     = NULL;
 381         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 382         if (!a->formats && arg->formats)
 383             av_freep(&a);
 384     }
 385     return a;
 386 }
 387
 388 static int can_merge_formats(AVFilterFormats *a_arg,
 389                              AVFilterFormats *b_arg,
 390                              enum AVMediaType type,
 391                              int is_sample_rate)
 392 {
 393     AVFilterFormats *a, *b, *ret;
 394     if (a_arg == b_arg)
 395         return 1;
 396     a = clone_filter_formats(a_arg);
 397     b = clone_filter_formats(b_arg);
 398
 399     if (!a || !b) {
 400         if (a)
 401             av_freep(&a->formats);
 402         if (b)
 403             av_freep(&b->formats);
 404
 405         av_freep(&a);
 406         av_freep(&b);
 407
 408         return 0;
 409     }
 410
 411     if (is_sample_rate) {
 412         ret = ff_merge_samplerates(a, b);
 413     } else {
 414         ret = ff_merge_formats(a, b, type);
 415     }
 416     if (ret) {
 417         av_freep(&ret->formats);
 418         av_freep(&ret->refs);
 419         av_freep(&ret);
 420         return 1;
 421     } else {
 422         av_freep(&a->formats);
 423         av_freep(&b->formats);
 424         av_freep(&a);
 425         av_freep(&b);
 426         return 0;
 427     }
 428 }
 429
 430 /**
 431  * Perform one round of query_formats() and merging formats lists on the
 432  * filter graph.
 433  * @return  >=0 if all links formats lists could be queried and merged;
 434  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 435  *          and a later call may succeed;
 436  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 437  *          was made and the negotiation is stuck;
 438  *          a negative error code if some other error happened
 439  */
 440 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 441 {
 442     int i, j, ret;
 443     int scaler_count = 0, resampler_count = 0;
 444     int count_queried = 0;        /* successful calls to query_formats() */
 445     int count_merged = 0;         /* successful merge of formats lists */
 446     int count_already_merged = 0; /* lists already merged */
 447     int count_delayed = 0;        /* lists that need to be merged later */
 448
 449     for (i = 0; i < graph->nb_filters; i++) {
 450         AVFilterContext *f = graph->filters[i];
 451         if (formats_declared(f))
 452             continue;
 453         if (f->filter->query_formats)
 454             ret = filter_query_formats(f);
 455         else
 456             ret = ff_default_query_formats(f);
 457         if (ret < 0 && ret != AVERROR(EAGAIN))
 458             return ret;
 459         /* note: EAGAIN could indicate a partial success, not counted yet */
 460         count_queried += ret >= 0;
 461     }
 462
 463     /* go through and merge as many format lists as possible */
 464     for (i = 0; i < graph->nb_filters; i++) {
 465         AVFilterContext *filter = graph->filters[i];
 466
 467         for (j = 0; j < filter->nb_inputs; j++) {
 468             AVFilterLink *link = filter->inputs[j];
 469             int convert_needed = 0;
 470
 471             if (!link)
 472                 continue;
 473
 474             if (link->in_formats != link->out_formats
 475                 && link->in_formats && link->out_formats)
 476                 if (!can_merge_formats(link->in_formats, link->out_formats,
 477                                       link->type, 0))
 478                     convert_needed = 1;
 479             if (link->type == AVMEDIA_TYPE_AUDIO) {
 480                 if (link->in_samplerates != link->out_samplerates
 481                     && link->in_samplerates && link->out_samplerates)
 482                     if (!can_merge_formats(link->in_samplerates,
 483                                            link->out_samplerates,
 484                                            0, 1))
 485                         convert_needed = 1;
 486             }
 487
 488 #define MERGE_DISPATCH(field, statement)                                     \
 489             if (!(link->in_ ## field && link->out_ ## field)) {              \
 490                 count_delayed++;                                             \
 491             } else if (link->in_ ## field == link->out_ ## field) {          \
 492                 count_already_merged++;                                      \
 493             } else if (!convert_needed) {                                    \
 494                 count_merged++;                                              \
 495                 statement                                                    \
 496             }
 497
 498             if (link->type == AVMEDIA_TYPE_AUDIO) {
 499                 MERGE_DISPATCH(channel_layouts,
 500                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 501                                                   link->out_channel_layouts))
 502                         convert_needed = 1;
 503                 )
 504                 MERGE_DISPATCH(samplerates,
 505                     if (!ff_merge_samplerates(link->in_samplerates,
 506                                               link->out_samplerates))
 507                         convert_needed = 1;
 508                 )
 509             }
 510             MERGE_DISPATCH(formats,
 511                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 512                                       link->type))
 513                     convert_needed = 1;
 514             )
 515 #undef MERGE_DISPATCH
 516
 517             if (convert_needed) {
 518                 AVFilterContext *convert;
 519                 const AVFilter *filter;
 520                 AVFilterLink *inlink, *outlink;
 521                 char inst_name[30];
 522
 523                 if (graph->disable_auto_convert) {
 524                     av_log(log_ctx, AV_LOG_ERROR,
 525                            "The filters '%s' and '%s' do not have a common format "
 526                            "and automatic conversion is disabled.\n",
 527                            link->src->name, link->dst->name);
 528                     return AVERROR(EINVAL);
 529                 }
 530
 531                 /* couldn't merge format lists. auto-insert conversion filter */
 532                 switch (link->type) {
 533                 case AVMEDIA_TYPE_VIDEO:
 534                     if (!(filter = avfilter_get_by_name("scale"))) {
 535                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 536                                "not present, cannot convert pixel formats.\n");
 537                         return AVERROR(EINVAL);
 538                     }
 539
 540                     snprintf(inst_name, sizeof(inst_name), "auto_scaler_%d",
 541                              scaler_count++);
 542
 543                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 544                                                             inst_name, graph->scale_sws_opts, NULL,
 545                                                             graph)) < 0)
 546                         return ret;
 547                     break;
 548                 case AVMEDIA_TYPE_AUDIO:
 549                     if (!(filter = avfilter_get_by_name("aresample"))) {
 550                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 551                                "not present, cannot convert audio formats.\n");
 552                         return AVERROR(EINVAL);
 553                     }
 554
 555                     snprintf(inst_name, sizeof(inst_name), "auto_resampler_%d",
 556                              resampler_count++);
 557                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 558                                                             inst_name, graph->aresample_swr_opts,
 559                                                             NULL, graph)) < 0)
 560                         return ret;
 561                     break;
 562                 default:
 563                     return AVERROR(EINVAL);
 564                 }
 565
 566                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 567                     return ret;
 568
 569                 if ((ret = filter_query_formats(convert)) < 0)
 570                     return ret;
 571
 572                 inlink  = convert->inputs[0];
 573                 outlink = convert->outputs[0];
 574                 av_assert0( inlink-> in_formats->refcount > 0);
 575                 av_assert0( inlink->out_formats->refcount > 0);
 576                 av_assert0(outlink-> in_formats->refcount > 0);
 577                 av_assert0(outlink->out_formats->refcount > 0);
 578                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 579                     av_assert0( inlink-> in_samplerates->refcount > 0);
 580                     av_assert0( inlink->out_samplerates->refcount > 0);
 581                     av_assert0(outlink-> in_samplerates->refcount > 0);
 582                     av_assert0(outlink->out_samplerates->refcount > 0);
 583                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
 584                     av_assert0( inlink->out_channel_layouts->refcount > 0);
 585                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
 586                     av_assert0(outlink->out_channel_layouts->refcount > 0);
 587                 }
 588                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 589                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 590                     ret = AVERROR(ENOSYS);
 591                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 592                     (!ff_merge_samplerates(inlink->in_samplerates,
 593                                            inlink->out_samplerates) ||
 594                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 595                                                inlink->out_channel_layouts)))
 596                     ret = AVERROR(ENOSYS);
 597                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 598                     (!ff_merge_samplerates(outlink->in_samplerates,
 599                                            outlink->out_samplerates) ||
 600                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 601                                                outlink->out_channel_layouts)))
 602                     ret = AVERROR(ENOSYS);
 603
 604                 if (ret < 0) {
 605                     av_log(log_ctx, AV_LOG_ERROR,
 606                            "Impossible to convert between the formats supported by the filter "
 607                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 608                     return ret;
 609                 }
 610             }
 611         }
 612     }
 613
 614     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 615            "%d queried, %d merged, %d already done, %d delayed\n",
 616            count_queried, count_merged, count_already_merged, count_delayed);
 617     if (count_delayed) {
 618         AVBPrint bp;
 619
 620         /* if count_queried > 0, one filter at least did set its formats,
 621            that will give additional information to its neighbour;
 622            if count_merged > 0, one pair of formats lists at least was merged,
 623            that will give additional information to all connected filters;
 624            in both cases, progress was made and a new round must be done */
 625         if (count_queried || count_merged)
 626             return AVERROR(EAGAIN);
 627         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 628         for (i = 0; i < graph->nb_filters; i++)
 629             if (!formats_declared(graph->filters[i]))
 630                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 631                           graph->filters[i]->name);
 632         av_log(graph, AV_LOG_ERROR,
 633                "The following filters could not choose their formats: %s\n"
 634                "Consider inserting the (a)format filter near their input or "
 635                "output.\n", bp.str);
 636         return AVERROR(EIO);
 637     }
 638     return 0;
 639 }
 640
 641 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 642 {
 643     int score = 0;
 644
 645     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 646         score ++;
 647
 648     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 649         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 650     }else
 651         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 652
 653     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 654         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 655         score += 20;
 656
 657     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 658         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 659         score += 2;
 660
 661     return score;
 662 }
 663
 664 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 665                                                      enum AVSampleFormat src_fmt)
 666 {
 667     int score1, score2;
 668
 669     score1 = get_fmt_score(dst_fmt1, src_fmt);
 670     score2 = get_fmt_score(dst_fmt2, src_fmt);
 671
 672     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 673 }
 674
 675 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 676 {
 677     if (!link || !link->in_formats)
 678         return 0;
 679
 680     if (link->type == AVMEDIA_TYPE_VIDEO) {
 681         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 682             //FIXME: This should check for AV_PIX_FMT_FLAG_ALPHA after PAL8 pixel format without alpha is implemented
 683             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 684             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 685             int i;
 686             for (i=0; i<link->in_formats->nb_formats; i++) {
 687                 enum AVPixelFormat p = link->in_formats->formats[i];
 688                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 689             }
 690             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 691                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 692                    av_get_pix_fmt_name(ref->format), has_alpha);
 693             link->in_formats->formats[0] = best;
 694         }
 695     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 696         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 697             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 698             int i;
 699             for (i=0; i<link->in_formats->nb_formats; i++) {
 700                 enum AVSampleFormat p = link->in_formats->formats[i];
 701                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 702             }
 703             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 704                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
 705                    av_get_sample_fmt_name(ref->format));
 706             link->in_formats->formats[0] = best;
 707         }
 708     }
 709
 710     link->in_formats->nb_formats = 1;
 711     link->format = link->in_formats->formats[0];
 712
 713     if (link->type == AVMEDIA_TYPE_AUDIO) {
 714         if (!link->in_samplerates->nb_formats) {
 715             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 716                    " the link between filters %s and %s.\n", link->src->name,
 717                    link->dst->name);
 718             return AVERROR(EINVAL);
 719         }
 720         link->in_samplerates->nb_formats = 1;
 721         link->sample_rate = link->in_samplerates->formats[0];
 722
 723         if (link->in_channel_layouts->all_layouts) {
 724             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 725                    " the link between filters %s and %s.\n", link->src->name,
 726                    link->dst->name);
 727             if (!link->in_channel_layouts->all_counts)
 728                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 729                        "supported, try specifying a channel layout using "
 730                        "'aformat=channel_layouts=something'.\n");
 731             return AVERROR(EINVAL);
 732         }
 733         link->in_channel_layouts->nb_channel_layouts = 1;
 734         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 735         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 736             link->channel_layout = 0;
 737         else
 738             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 739     }
 740
 741     ff_formats_unref(&link->in_formats);
 742     ff_formats_unref(&link->out_formats);
 743     ff_formats_unref(&link->in_samplerates);
 744     ff_formats_unref(&link->out_samplerates);
 745     ff_channel_layouts_unref(&link->in_channel_layouts);
 746     ff_channel_layouts_unref(&link->out_channel_layouts);
 747
 748     return 0;
 749 }
 750
 751 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
 752 do {                                                                   \
 753     for (i = 0; i < filter->nb_inputs; i++) {                          \
 754         AVFilterLink *link = filter->inputs[i];                        \
 755         fmt_type fmt;                                                  \
 756                                                                        \
 757         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 758             continue;                                                  \
 759         fmt = link->out_ ## list->var[0];                              \
 760                                                                        \
 761         for (j = 0; j < filter->nb_outputs; j++) {                     \
 762             AVFilterLink *out_link = filter->outputs[j];               \
 763             list_type *fmts;                                           \
 764                                                                        \
 765             if (link->type != out_link->type ||                        \
 766                 out_link->in_ ## list->nb == 1)                        \
 767                 continue;                                              \
 768             fmts = out_link->in_ ## list;                              \
 769                                                                        \
 770             if (!out_link->in_ ## list->nb) {                          \
 771                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
 772                     return ret;                                        \
 773                 ret = 1;                                               \
 774                 break;                                                 \
 775             }                                                          \
 776                                                                        \
 777             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 778                 if (fmts->var[k] == fmt) {                             \
 779                     fmts->var[0]  = fmt;                               \
 780                     fmts->nb = 1;                                      \
 781                     ret = 1;                                           \
 782                     break;                                             \
 783                 }                                                      \
 784         }                                                              \
 785     }                                                                  \
 786 } while (0)
 787
 788 static int reduce_formats_on_filter(AVFilterContext *filter)
 789 {
 790     int i, j, k, ret = 0;
 791
 792     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 793                    nb_formats, ff_add_format, ff_formats_unref);
 794     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 795                    nb_formats, ff_add_format, ff_formats_unref);
 796
 797     /* reduce channel layouts */
 798     for (i = 0; i < filter->nb_inputs; i++) {
 799         AVFilterLink *inlink = filter->inputs[i];
 800         uint64_t fmt;
 801
 802         if (!inlink->out_channel_layouts ||
 803             inlink->out_channel_layouts->nb_channel_layouts != 1)
 804             continue;
 805         fmt = inlink->out_channel_layouts->channel_layouts[0];
 806
 807         for (j = 0; j < filter->nb_outputs; j++) {
 808             AVFilterLink *outlink = filter->outputs[j];
 809             AVFilterChannelLayouts *fmts;
 810
 811             fmts = outlink->in_channel_layouts;
 812             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 813                 continue;
 814
 815             if (fmts->all_layouts &&
 816                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 817                 /* Turn the infinite list into a singleton */
 818                 fmts->all_layouts = fmts->all_counts  = 0;
 819                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
 820                     ret = 1;
 821                 break;
 822             }
 823
 824             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 825                 if (fmts->channel_layouts[k] == fmt) {
 826                     fmts->channel_layouts[0]  = fmt;
 827                     fmts->nb_channel_layouts = 1;
 828                     ret = 1;
 829                     break;
 830                 }
 831             }
 832         }
 833     }
 834
 835     return ret;
 836 }
 837
 838 static int reduce_formats(AVFilterGraph *graph)
 839 {
 840     int i, reduced, ret;
 841
 842     do {
 843         reduced = 0;
 844
 845         for (i = 0; i < graph->nb_filters; i++) {
 846             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
 847                 return ret;
 848             reduced |= ret;
 849         }
 850     } while (reduced);
 851
 852     return 0;
 853 }
 854
 855 static void swap_samplerates_on_filter(AVFilterContext *filter)
 856 {
 857     AVFilterLink *link = NULL;
 858     int sample_rate;
 859     int i, j;
 860
 861     for (i = 0; i < filter->nb_inputs; i++) {
 862         link = filter->inputs[i];
 863
 864         if (link->type == AVMEDIA_TYPE_AUDIO &&
 865             link->out_samplerates->nb_formats== 1)
 866             break;
 867     }
 868     if (i == filter->nb_inputs)
 869         return;
 870
 871     sample_rate = link->out_samplerates->formats[0];
 872
 873     for (i = 0; i < filter->nb_outputs; i++) {
 874         AVFilterLink *outlink = filter->outputs[i];
 875         int best_idx, best_diff = INT_MAX;
 876
 877         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 878             outlink->in_samplerates->nb_formats < 2)
 879             continue;
 880
 881         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 882             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 883
 884             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
 885
 886             if (diff < best_diff) {
 887                 best_diff = diff;
 888                 best_idx  = j;
 889             }
 890         }
 891         FFSWAP(int, outlink->in_samplerates->formats[0],
 892                outlink->in_samplerates->formats[best_idx]);
 893     }
 894 }
 895
 896 static void swap_samplerates(AVFilterGraph *graph)
 897 {
 898     int i;
 899
 900     for (i = 0; i < graph->nb_filters; i++)
 901         swap_samplerates_on_filter(graph->filters[i]);
 902 }
 903
 904 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 905 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 906 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 907 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 908 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 909 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 910 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 911
 912 /* allowable substitutions for channel pairs when comparing layouts,
 913  * ordered by priority for both values */
 914 static const uint64_t ch_subst[][2] = {
 915     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 916     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 917     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 918     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 919     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 920     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 921     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 922     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 923     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 924     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 925     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 926     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 927     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 928     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 929     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 930     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 931     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 932     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 933     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 934     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 935     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 936 };
 937
 938 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 939 {
 940     AVFilterLink *link = NULL;
 941     int i, j, k;
 942
 943     for (i = 0; i < filter->nb_inputs; i++) {
 944         link = filter->inputs[i];
 945
 946         if (link->type == AVMEDIA_TYPE_AUDIO &&
 947             link->out_channel_layouts->nb_channel_layouts == 1)
 948             break;
 949     }
 950     if (i == filter->nb_inputs)
 951         return;
 952
 953     for (i = 0; i < filter->nb_outputs; i++) {
 954         AVFilterLink *outlink = filter->outputs[i];
 955         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 956
 957         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 958             outlink->in_channel_layouts->nb_channel_layouts < 2)
 959             continue;
 960
 961         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 962             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 963             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 964             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 965             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 966             int count_diff        = out_channels - in_channels;
 967             int matched_channels, extra_channels;
 968             int score = 100000;
 969
 970             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 971                 /* Compute score in case the input or output layout encodes
 972                    a channel count; in this case the score is not altered by
 973                    the computation afterwards, as in_chlayout and
 974                    out_chlayout have both been set to 0 */
 975                 if (FF_LAYOUT2COUNT(in_chlayout))
 976                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 977                 if (FF_LAYOUT2COUNT(out_chlayout))
 978                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 979                 score -= 10000 + FFABS(out_channels - in_channels) +
 980                          (in_channels > out_channels ? 10000 : 0);
 981                 in_chlayout = out_chlayout = 0;
 982                 /* Let the remaining computation run, even if the score
 983                    value is not altered */
 984             }
 985
 986             /* channel substitution */
 987             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 988                 uint64_t cmp0 = ch_subst[k][0];
 989                 uint64_t cmp1 = ch_subst[k][1];
 990                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 991                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 992                     in_chlayout  &= ~cmp0;
 993                     out_chlayout &= ~cmp1;
 994                     /* add score for channel match, minus a deduction for
 995                        having to do the substitution */
 996                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 997                 }
 998             }
 999
1000             /* no penalty for LFE channel mismatch */
1001             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
1002                 (out_chlayout & AV_CH_LOW_FREQUENCY))
1003                 score += 10;
1004             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
1005             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
1006
1007             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
1008                                                                  out_chlayout);
1009             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
1010                                                                  (~in_chlayout));
1011             score += 10 * matched_channels - 5 * extra_channels;
1012
1013             if (score > best_score ||
1014                 (count_diff < best_count_diff && score == best_score)) {
1015                 best_score = score;
1016                 best_idx   = j;
1017                 best_count_diff = count_diff;
1018             }
1019         }
1020         av_assert0(best_idx >= 0);
1021         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1022                outlink->in_channel_layouts->channel_layouts[best_idx]);
1023     }
1024
1025 }
1026
1027 static void swap_channel_layouts(AVFilterGraph *graph)
1028 {
1029     int i;
1030
1031     for (i = 0; i < graph->nb_filters; i++)
1032         swap_channel_layouts_on_filter(graph->filters[i]);
1033 }
1034
1035 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1036 {
1037     AVFilterLink *link = NULL;
1038     int format, bps;
1039     int i, j;
1040
1041     for (i = 0; i < filter->nb_inputs; i++) {
1042         link = filter->inputs[i];
1043
1044         if (link->type == AVMEDIA_TYPE_AUDIO &&
1045             link->out_formats->nb_formats == 1)
1046             break;
1047     }
1048     if (i == filter->nb_inputs)
1049         return;
1050
1051     format = link->out_formats->formats[0];
1052     bps    = av_get_bytes_per_sample(format);
1053
1054     for (i = 0; i < filter->nb_outputs; i++) {
1055         AVFilterLink *outlink = filter->outputs[i];
1056         int best_idx = -1, best_score = INT_MIN;
1057
1058         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1059             outlink->in_formats->nb_formats < 2)
1060             continue;
1061
1062         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1063             int out_format = outlink->in_formats->formats[j];
1064             int out_bps    = av_get_bytes_per_sample(out_format);
1065             int score;
1066
1067             if (av_get_packed_sample_fmt(out_format) == format ||
1068                 av_get_planar_sample_fmt(out_format) == format) {
1069                 best_idx   = j;
1070                 break;
1071             }
1072
1073             /* for s32 and float prefer double to prevent loss of information */
1074             if (bps == 4 && out_bps == 8) {
1075                 best_idx = j;
1076                 break;
1077             }
1078
1079             /* prefer closest higher or equal bps */
1080             score = -abs(out_bps - bps);
1081             if (out_bps >= bps)
1082                 score += INT_MAX/2;
1083
1084             if (score > best_score) {
1085                 best_score = score;
1086                 best_idx   = j;
1087             }
1088         }
1089         av_assert0(best_idx >= 0);
1090         FFSWAP(int, outlink->in_formats->formats[0],
1091                outlink->in_formats->formats[best_idx]);
1092     }
1093 }
1094
1095 static void swap_sample_fmts(AVFilterGraph *graph)
1096 {
1097     int i;
1098
1099     for (i = 0; i < graph->nb_filters; i++)
1100         swap_sample_fmts_on_filter(graph->filters[i]);
1101
1102 }
1103
1104 static int pick_formats(AVFilterGraph *graph)
1105 {
1106     int i, j, ret;
1107     int change;
1108
1109     do{
1110         change = 0;
1111         for (i = 0; i < graph->nb_filters; i++) {
1112             AVFilterContext *filter = graph->filters[i];
1113             if (filter->nb_inputs){
1114                 for (j = 0; j < filter->nb_inputs; j++){
1115                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1116                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1117                             return ret;
1118                         change = 1;
1119                     }
1120                 }
1121             }
1122             if (filter->nb_outputs){
1123                 for (j = 0; j < filter->nb_outputs; j++){
1124                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1125                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1126                             return ret;
1127                         change = 1;
1128                     }
1129                 }
1130             }
1131             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1132                 for (j = 0; j < filter->nb_outputs; j++) {
1133                     if(filter->outputs[j]->format<0) {
1134                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1135                             return ret;
1136                         change = 1;
1137                     }
1138                 }
1139             }
1140         }
1141     }while(change);
1142
1143     for (i = 0; i < graph->nb_filters; i++) {
1144         AVFilterContext *filter = graph->filters[i];
1145
1146         for (j = 0; j < filter->nb_inputs; j++)
1147             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1148                 return ret;
1149         for (j = 0; j < filter->nb_outputs; j++)
1150             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1151                 return ret;
1152     }
1153     return 0;
1154 }
1155
1156 /**
1157  * Configure the formats of all the links in the graph.
1158  */
1159 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1160 {
1161     int ret;
1162
1163     /* find supported formats from sub-filters, and merge along links */
1164     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1165         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1166     if (ret < 0)
1167         return ret;
1168
1169     /* Once everything is merged, it's possible that we'll still have
1170      * multiple valid media format choices. We try to minimize the amount
1171      * of format conversion inside filters */
1172     if ((ret = reduce_formats(graph)) < 0)
1173         return ret;
1174
1175     /* for audio filters, ensure the best format, sample rate and channel layout
1176      * is selected */
1177     swap_sample_fmts(graph);
1178     swap_samplerates(graph);
1179     swap_channel_layouts(graph);
1180
1181     if ((ret = pick_formats(graph)) < 0)
1182         return ret;
1183
1184     return 0;
1185 }
1186
1187 static int graph_config_pointers(AVFilterGraph *graph,
1188                                              AVClass *log_ctx)
1189 {
1190     unsigned i, j;
1191     int sink_links_count = 0, n = 0;
1192     AVFilterContext *f;
1193     AVFilterLink **sinks;
1194
1195     for (i = 0; i < graph->nb_filters; i++) {
1196         f = graph->filters[i];
1197         for (j = 0; j < f->nb_inputs; j++) {
1198             f->inputs[j]->graph     = graph;
1199             f->inputs[j]->age_index = -1;
1200         }
1201         for (j = 0; j < f->nb_outputs; j++) {
1202             f->outputs[j]->graph    = graph;
1203             f->outputs[j]->age_index= -1;
1204         }
1205         if (!f->nb_outputs) {
1206             if (f->nb_inputs > INT_MAX - sink_links_count)
1207                 return AVERROR(EINVAL);
1208             sink_links_count += f->nb_inputs;
1209         }
1210     }
1211     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1212     if (!sinks)
1213         return AVERROR(ENOMEM);
1214     for (i = 0; i < graph->nb_filters; i++) {
1215         f = graph->filters[i];
1216         if (!f->nb_outputs) {
1217             for (j = 0; j < f->nb_inputs; j++) {
1218                 sinks[n] = f->inputs[j];
1219                 f->inputs[j]->age_index = n++;
1220             }
1221         }
1222     }
1223     av_assert0(n == sink_links_count);
1224     graph->sink_links       = sinks;
1225     graph->sink_links_count = sink_links_count;
1226     return 0;
1227 }
1228
1229 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1230 {
1231     AVFilterContext *f;
1232     int i, j, ret;
1233     int fifo_count = 0;
1234
1235     for (i = 0; i < graph->nb_filters; i++) {
1236         f = graph->filters[i];
1237
1238         for (j = 0; j < f->nb_inputs; j++) {
1239             AVFilterLink *link = f->inputs[j];
1240             AVFilterContext *fifo_ctx;
1241             const AVFilter *fifo;
1242             char name[32];
1243
1244             if (!link->dstpad->needs_fifo)
1245                 continue;
1246
1247             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1248                    avfilter_get_by_name("fifo") :
1249                    avfilter_get_by_name("afifo");
1250
1251             snprintf(name, sizeof(name), "auto_fifo_%d", fifo_count++);
1252
1253             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1254                                                NULL, graph);
1255             if (ret < 0)
1256                 return ret;
1257
1258             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1259             if (ret < 0)
1260                 return ret;
1261         }
1262     }
1263
1264     return 0;
1265 }
1266
1267 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1268 {
1269     int ret;
1270
1271     if ((ret = graph_check_validity(graphctx, log_ctx)))
1272         return ret;
1273     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1274         return ret;
1275     if ((ret = graph_config_formats(graphctx, log_ctx)))
1276         return ret;
1277     if ((ret = graph_config_links(graphctx, log_ctx)))
1278         return ret;
1279     if ((ret = graph_check_links(graphctx, log_ctx)))
1280         return ret;
1281     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1282         return ret;
1283
1284     return 0;
1285 }
1286
1287 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1288 {
1289     int i, r = AVERROR(ENOSYS);
1290
1291     if (!graph)
1292         return r;
1293
1294     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1295         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1296         if (r != AVERROR(ENOSYS))
1297             return r;
1298     }
1299
1300     if (res_len && res)
1301         res[0] = 0;
1302
1303     for (i = 0; i < graph->nb_filters; i++) {
1304         AVFilterContext *filter = graph->filters[i];
1305         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1306             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1307             if (r != AVERROR(ENOSYS)) {
1308                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1309                     return r;
1310             }
1311         }
1312     }
1313
1314     return r;
1315 }
1316
1317 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1318 {
1319     int i;
1320
1321     if(!graph)
1322         return 0;
1323
1324     for (i = 0; i < graph->nb_filters; i++) {
1325         AVFilterContext *filter = graph->filters[i];
1326         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1327             AVFilterCommand **queue = &filter->command_queue, *next;
1328             while (*queue && (*queue)->time <= ts)
1329                 queue = &(*queue)->next;
1330             next = *queue;
1331             *queue = av_mallocz(sizeof(AVFilterCommand));
1332             if (!*queue)
1333                 return AVERROR(ENOMEM);
1334
1335             (*queue)->command = av_strdup(command);
1336             (*queue)->arg     = av_strdup(arg);
1337             (*queue)->time    = ts;
1338             (*queue)->flags   = flags;
1339             (*queue)->next    = next;
1340             if(flags & AVFILTER_CMD_FLAG_ONE)
1341                 return 0;
1342         }
1343     }
1344
1345     return 0;
1346 }
1347
1348 static void heap_bubble_up(AVFilterGraph *graph,
1349                            AVFilterLink *link, int index)
1350 {
1351     AVFilterLink **links = graph->sink_links;
1352
1353     av_assert0(index >= 0);
1354
1355     while (index) {
1356         int parent = (index - 1) >> 1;
1357         if (links[parent]->current_pts_us >= link->current_pts_us)
1358             break;
1359         links[index] = links[parent];
1360         links[index]->age_index = index;
1361         index = parent;
1362     }
1363     links[index] = link;
1364     link->age_index = index;
1365 }
1366
1367 static void heap_bubble_down(AVFilterGraph *graph,
1368                              AVFilterLink *link, int index)
1369 {
1370     AVFilterLink **links = graph->sink_links;
1371
1372     av_assert0(index >= 0);
1373
1374     while (1) {
1375         int child = 2 * index + 1;
1376         if (child >= graph->sink_links_count)
1377             break;
1378         if (child + 1 < graph->sink_links_count &&
1379             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1380             child++;
1381         if (link->current_pts_us < links[child]->current_pts_us)
1382             break;
1383         links[index] = links[child];
1384         links[index]->age_index = index;
1385         index = child;
1386     }
1387     links[index] = link;
1388     link->age_index = index;
1389 }
1390
1391 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1392 {
1393     heap_bubble_up  (graph, link, link->age_index);
1394     heap_bubble_down(graph, link, link->age_index);
1395 }
1396
1397 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1398 {
1399     AVFilterLink *oldest = graph->sink_links[0];
1400     int64_t frame_count;
1401     int r;
1402
1403     while (graph->sink_links_count) {
1404         oldest = graph->sink_links[0];
1405         if (oldest->dst->filter->activate) {
1406             /* For now, buffersink is the only filter implementing activate. */
1407             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1408                                               AV_BUFFERSINK_FLAG_PEEK);
1409             if (r != AVERROR_EOF)
1410                 return r;
1411         } else {
1412             r = ff_request_frame(oldest);
1413         }
1414         if (r != AVERROR_EOF)
1415             break;
1416         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1417                oldest->dst ? oldest->dst->name : "unknown",
1418                oldest->dstpad ? oldest->dstpad->name : "unknown");
1419         /* EOF: remove the link from the heap */
1420         if (oldest->age_index < --graph->sink_links_count)
1421             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1422                              oldest->age_index);
1423         oldest->age_index = -1;
1424     }
1425     if (!graph->sink_links_count)
1426         return AVERROR_EOF;
1427     av_assert1(!oldest->dst->filter->activate);
1428     av_assert1(oldest->age_index >= 0);
1429     frame_count = oldest->frame_count_out;
1430     while (frame_count == oldest->frame_count_out) {
1431         r = ff_filter_graph_run_once(graph);
1432         if (r == AVERROR(EAGAIN) &&
1433             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1434             !oldest->status_in)
1435             ff_request_frame(oldest);
1436         else if (r < 0)
1437             return r;
1438     }
1439     return 0;
1440 }
1441
1442 int ff_filter_graph_run_once(AVFilterGraph *graph)
1443 {
1444     AVFilterContext *filter;
1445     unsigned i;
1446
1447     av_assert0(graph->nb_filters);
1448     filter = graph->filters[0];
1449     for (i = 1; i < graph->nb_filters; i++)
1450         if (graph->filters[i]->ready > filter->ready)
1451             filter = graph->filters[i];
1452     if (!filter->ready)
1453         return AVERROR(EAGAIN);
1454     return ff_filter_activate(filter);
1455 }