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_link_check_formats(void *log, AVFilterLink *link, AVFilterFormatsConfig *cfg)
 317 {
 318     int ret;
 319
 320     switch (link->type) {
 321
 322     case AVMEDIA_TYPE_VIDEO:
 323         if ((ret = ff_formats_check_pixel_formats(log, cfg->formats)) < 0)
 324             return ret;
 325         break;
 326
 327     case AVMEDIA_TYPE_AUDIO:
 328         if ((ret = ff_formats_check_sample_formats(log, cfg->formats)) < 0 ||
 329             (ret = ff_formats_check_sample_rates(log, cfg->samplerates)) < 0 ||
 330             (ret = ff_formats_check_channel_layouts(log, cfg->channel_layouts)) < 0)
 331             return ret;
 332         break;
 333
 334     default:
 335         av_assert0(!"reached");
 336     }
 337     return 0;
 338 }
 339
 340 /**
 341  * Check the validity of the formats / etc. lists set by query_formats().
 342  *
 343  * In particular, check they do not contain any redundant element.
 344  */
 345 static int filter_check_formats(AVFilterContext *ctx)
 346 {
 347     unsigned i;
 348     int ret;
 349
 350     for (i = 0; i < ctx->nb_inputs; i++) {
 351         ret = filter_link_check_formats(ctx, ctx->inputs[i], &ctx->inputs[i]->outcfg);
 352         if (ret < 0)
 353             return ret;
 354     }
 355     for (i = 0; i < ctx->nb_outputs; i++) {
 356         ret = filter_link_check_formats(ctx, ctx->outputs[i], &ctx->outputs[i]->incfg);
 357         if (ret < 0)
 358             return ret;
 359     }
 360     return 0;
 361 }
 362
 363 static int filter_query_formats(AVFilterContext *ctx)
 364 {
 365     int ret, i;
 366     AVFilterFormats *formats;
 367     AVFilterChannelLayouts *chlayouts;
 368     AVFilterFormats *samplerates;
 369     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 370                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 371                             AVMEDIA_TYPE_VIDEO;
 372
 373     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 374         if (ret != AVERROR(EAGAIN))
 375             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 376                    ctx->name, av_err2str(ret));
 377         return ret;
 378     }
 379     ret = filter_check_formats(ctx);
 380     if (ret < 0)
 381         return ret;
 382
 383     for (i = 0; i < ctx->nb_inputs; i++)
 384         sanitize_channel_layouts(ctx, ctx->inputs[i]->outcfg.channel_layouts);
 385     for (i = 0; i < ctx->nb_outputs; i++)
 386         sanitize_channel_layouts(ctx, ctx->outputs[i]->incfg.channel_layouts);
 387
 388     formats = ff_all_formats(type);
 389     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
 390         return ret;
 391     if (type == AVMEDIA_TYPE_AUDIO) {
 392         samplerates = ff_all_samplerates();
 393         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
 394             return ret;
 395         chlayouts = ff_all_channel_layouts();
 396         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
 397             return ret;
 398     }
 399     return 0;
 400 }
 401
 402 static int formats_declared(AVFilterContext *f)
 403 {
 404     int i;
 405
 406     for (i = 0; i < f->nb_inputs; i++) {
 407         if (!f->inputs[i]->outcfg.formats)
 408             return 0;
 409         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 410             !(f->inputs[i]->outcfg.samplerates &&
 411               f->inputs[i]->outcfg.channel_layouts))
 412             return 0;
 413     }
 414     for (i = 0; i < f->nb_outputs; i++) {
 415         if (!f->outputs[i]->incfg.formats)
 416             return 0;
 417         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 418             !(f->outputs[i]->incfg.samplerates &&
 419               f->outputs[i]->incfg.channel_layouts))
 420             return 0;
 421     }
 422     return 1;
 423 }
 424
 425 /**
 426  * Perform one round of query_formats() and merging formats lists on the
 427  * filter graph.
 428  * @return  >=0 if all links formats lists could be queried and merged;
 429  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 430  *          and a later call may succeed;
 431  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 432  *          was made and the negotiation is stuck;
 433  *          a negative error code if some other error happened
 434  */
 435 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 436 {
 437     int i, j, ret;
 438     int scaler_count = 0, resampler_count = 0;
 439     int count_queried = 0;        /* successful calls to query_formats() */
 440     int count_merged = 0;         /* successful merge of formats lists */
 441     int count_already_merged = 0; /* lists already merged */
 442     int count_delayed = 0;        /* lists that need to be merged later */
 443
 444     for (i = 0; i < graph->nb_filters; i++) {
 445         AVFilterContext *f = graph->filters[i];
 446         if (formats_declared(f))
 447             continue;
 448         if (f->filter->query_formats)
 449             ret = filter_query_formats(f);
 450         else
 451             ret = ff_default_query_formats(f);
 452         if (ret < 0 && ret != AVERROR(EAGAIN))
 453             return ret;
 454         /* note: EAGAIN could indicate a partial success, not counted yet */
 455         count_queried += ret >= 0;
 456     }
 457
 458     /* go through and merge as many format lists as possible */
 459     for (i = 0; i < graph->nb_filters; i++) {
 460         AVFilterContext *filter = graph->filters[i];
 461
 462         for (j = 0; j < filter->nb_inputs; j++) {
 463             AVFilterLink *link = filter->inputs[j];
 464             int convert_needed = 0;
 465
 466             if (!link)
 467                 continue;
 468
 469             if (link->incfg.formats != link->outcfg.formats
 470                 && link->incfg.formats && link->outcfg.formats)
 471                 if (!ff_can_merge_formats(link->incfg.formats, link->outcfg.formats,
 472                                           link->type))
 473                     convert_needed = 1;
 474             if (link->type == AVMEDIA_TYPE_AUDIO) {
 475                 if (link->incfg.samplerates != link->outcfg.samplerates
 476                     && link->incfg.samplerates && link->outcfg.samplerates)
 477                     if (!ff_can_merge_samplerates(link->incfg.samplerates,
 478                                                   link->outcfg.samplerates))
 479                         convert_needed = 1;
 480             }
 481
 482 #define CHECKED_MERGE(field, ...) ((ret = ff_merge_ ## field(__VA_ARGS__)) <= 0)
 483 #define MERGE_DISPATCH(field, ...)                                           \
 484             if (!(link->incfg.field && link->outcfg.field)) {                \
 485                 count_delayed++;                                             \
 486             } else if (link->incfg.field == link->outcfg.field) {            \
 487                 count_already_merged++;                                      \
 488             } else if (!convert_needed) {                                    \
 489                 count_merged++;                                              \
 490                 if (CHECKED_MERGE(field, __VA_ARGS__)) {                     \
 491                     if (ret < 0)                                             \
 492                         return ret;                                          \
 493                     convert_needed = 1;                                      \
 494                 }                                                            \
 495             }
 496
 497             if (link->type == AVMEDIA_TYPE_AUDIO) {
 498                 MERGE_DISPATCH(channel_layouts, link->incfg.channel_layouts,
 499                                                 link->outcfg.channel_layouts)
 500                 MERGE_DISPATCH(samplerates, link->incfg.samplerates,
 501                                             link->outcfg.samplerates)
 502             }
 503             MERGE_DISPATCH(formats, link->incfg.formats,
 504                            link->outcfg.formats, link->type)
 505 #undef MERGE_DISPATCH
 506
 507             if (convert_needed) {
 508                 AVFilterContext *convert;
 509                 const AVFilter *filter;
 510                 AVFilterLink *inlink, *outlink;
 511                 char inst_name[30];
 512
 513                 if (graph->disable_auto_convert) {
 514                     av_log(log_ctx, AV_LOG_ERROR,
 515                            "The filters '%s' and '%s' do not have a common format "
 516                            "and automatic conversion is disabled.\n",
 517                            link->src->name, link->dst->name);
 518                     return AVERROR(EINVAL);
 519                 }
 520
 521                 /* couldn't merge format lists. auto-insert conversion filter */
 522                 switch (link->type) {
 523                 case AVMEDIA_TYPE_VIDEO:
 524                     if (!(filter = avfilter_get_by_name("scale"))) {
 525                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 526                                "not present, cannot convert pixel formats.\n");
 527                         return AVERROR(EINVAL);
 528                     }
 529
 530                     snprintf(inst_name, sizeof(inst_name), "auto_scaler_%d",
 531                              scaler_count++);
 532
 533                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 534                                                             inst_name, graph->scale_sws_opts, NULL,
 535                                                             graph)) < 0)
 536                         return ret;
 537                     break;
 538                 case AVMEDIA_TYPE_AUDIO:
 539                     if (!(filter = avfilter_get_by_name("aresample"))) {
 540                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 541                                "not present, cannot convert audio formats.\n");
 542                         return AVERROR(EINVAL);
 543                     }
 544
 545                     snprintf(inst_name, sizeof(inst_name), "auto_resampler_%d",
 546                              resampler_count++);
 547                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 548                                                             inst_name, graph->aresample_swr_opts,
 549                                                             NULL, graph)) < 0)
 550                         return ret;
 551                     break;
 552                 default:
 553                     return AVERROR(EINVAL);
 554                 }
 555
 556                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 557                     return ret;
 558
 559                 if ((ret = filter_query_formats(convert)) < 0)
 560                     return ret;
 561
 562                 inlink  = convert->inputs[0];
 563                 outlink = convert->outputs[0];
 564                 av_assert0( inlink->incfg.formats->refcount > 0);
 565                 av_assert0( inlink->outcfg.formats->refcount > 0);
 566                 av_assert0(outlink->incfg.formats->refcount > 0);
 567                 av_assert0(outlink->outcfg.formats->refcount > 0);
 568                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 569                     av_assert0( inlink-> incfg.samplerates->refcount > 0);
 570                     av_assert0( inlink->outcfg.samplerates->refcount > 0);
 571                     av_assert0(outlink-> incfg.samplerates->refcount > 0);
 572                     av_assert0(outlink->outcfg.samplerates->refcount > 0);
 573                     av_assert0( inlink-> incfg.channel_layouts->refcount > 0);
 574                     av_assert0( inlink->outcfg.channel_layouts->refcount > 0);
 575                     av_assert0(outlink-> incfg.channel_layouts->refcount > 0);
 576                     av_assert0(outlink->outcfg.channel_layouts->refcount > 0);
 577                 }
 578                 if (CHECKED_MERGE(formats, inlink->incfg.formats,
 579                                   inlink->outcfg.formats, inlink->type)         ||
 580                     CHECKED_MERGE(formats, outlink->incfg.formats,
 581                                   outlink->outcfg.formats, outlink->type)       ||
 582                     inlink->type == AVMEDIA_TYPE_AUDIO &&
 583                     (CHECKED_MERGE(samplerates, inlink->incfg.samplerates,
 584                                                 inlink->outcfg.samplerates)  ||
 585                      CHECKED_MERGE(channel_layouts, inlink->incfg.channel_layouts,
 586                                    inlink->outcfg.channel_layouts))             ||
 587                     outlink->type == AVMEDIA_TYPE_AUDIO &&
 588                     (CHECKED_MERGE(samplerates, outlink->incfg.samplerates,
 589                                                 outlink->outcfg.samplerates) ||
 590                      CHECKED_MERGE(channel_layouts, outlink->incfg.channel_layouts,
 591                                                     outlink->outcfg.channel_layouts))) {
 592                     if (ret < 0)
 593                         return ret;
 594                     av_log(log_ctx, AV_LOG_ERROR,
 595                            "Impossible to convert between the formats supported by the filter "
 596                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 597                     return AVERROR(ENOSYS);
 598                 }
 599             }
 600         }
 601     }
 602
 603     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 604            "%d queried, %d merged, %d already done, %d delayed\n",
 605            count_queried, count_merged, count_already_merged, count_delayed);
 606     if (count_delayed) {
 607         AVBPrint bp;
 608
 609         /* if count_queried > 0, one filter at least did set its formats,
 610            that will give additional information to its neighbour;
 611            if count_merged > 0, one pair of formats lists at least was merged,
 612            that will give additional information to all connected filters;
 613            in both cases, progress was made and a new round must be done */
 614         if (count_queried || count_merged)
 615             return AVERROR(EAGAIN);
 616         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 617         for (i = 0; i < graph->nb_filters; i++)
 618             if (!formats_declared(graph->filters[i]))
 619                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 620                           graph->filters[i]->name);
 621         av_log(graph, AV_LOG_ERROR,
 622                "The following filters could not choose their formats: %s\n"
 623                "Consider inserting the (a)format filter near their input or "
 624                "output.\n", bp.str);
 625         return AVERROR(EIO);
 626     }
 627     return 0;
 628 }
 629
 630 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 631 {
 632     int score = 0;
 633
 634     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 635         score ++;
 636
 637     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 638         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 639     }else
 640         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 641
 642     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 643         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 644         score += 20;
 645
 646     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 647         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 648         score += 2;
 649
 650     return score;
 651 }
 652
 653 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 654                                                      enum AVSampleFormat src_fmt)
 655 {
 656     int score1, score2;
 657
 658     score1 = get_fmt_score(dst_fmt1, src_fmt);
 659     score2 = get_fmt_score(dst_fmt2, src_fmt);
 660
 661     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 662 }
 663
 664 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 665 {
 666     if (!link || !link->incfg.formats)
 667         return 0;
 668
 669     if (link->type == AVMEDIA_TYPE_VIDEO) {
 670         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 671             //FIXME: This should check for AV_PIX_FMT_FLAG_ALPHA after PAL8 pixel format without alpha is implemented
 672             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 673             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 674             int i;
 675             for (i = 0; i < link->incfg.formats->nb_formats; i++) {
 676                 enum AVPixelFormat p = link->incfg.formats->formats[i];
 677                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 678             }
 679             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 680                    av_get_pix_fmt_name(best), link->incfg.formats->nb_formats,
 681                    av_get_pix_fmt_name(ref->format), has_alpha);
 682             link->incfg.formats->formats[0] = best;
 683         }
 684     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 685         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 686             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 687             int i;
 688             for (i = 0; i < link->incfg.formats->nb_formats; i++) {
 689                 enum AVSampleFormat p = link->incfg.formats->formats[i];
 690                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 691             }
 692             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 693                    av_get_sample_fmt_name(best), link->incfg.formats->nb_formats,
 694                    av_get_sample_fmt_name(ref->format));
 695             link->incfg.formats->formats[0] = best;
 696         }
 697     }
 698
 699     link->incfg.formats->nb_formats = 1;
 700     link->format = link->incfg.formats->formats[0];
 701
 702     if (link->type == AVMEDIA_TYPE_AUDIO) {
 703         if (!link->incfg.samplerates->nb_formats) {
 704             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 705                    " the link between filters %s and %s.\n", link->src->name,
 706                    link->dst->name);
 707             return AVERROR(EINVAL);
 708         }
 709         link->incfg.samplerates->nb_formats = 1;
 710         link->sample_rate = link->incfg.samplerates->formats[0];
 711
 712         if (link->incfg.channel_layouts->all_layouts) {
 713             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 714                    " the link between filters %s and %s.\n", link->src->name,
 715                    link->dst->name);
 716             if (!link->incfg.channel_layouts->all_counts)
 717                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 718                        "supported, try specifying a channel layout using "
 719                        "'aformat=channel_layouts=something'.\n");
 720             return AVERROR(EINVAL);
 721         }
 722         link->incfg.channel_layouts->nb_channel_layouts = 1;
 723         link->channel_layout = link->incfg.channel_layouts->channel_layouts[0];
 724         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 725             link->channel_layout = 0;
 726         else
 727             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 728     }
 729
 730     ff_formats_unref(&link->incfg.formats);
 731     ff_formats_unref(&link->outcfg.formats);
 732     ff_formats_unref(&link->incfg.samplerates);
 733     ff_formats_unref(&link->outcfg.samplerates);
 734     ff_channel_layouts_unref(&link->incfg.channel_layouts);
 735     ff_channel_layouts_unref(&link->outcfg.channel_layouts);
 736
 737     return 0;
 738 }
 739
 740 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 741 do {                                                                   \
 742     for (i = 0; i < filter->nb_inputs; i++) {                          \
 743         AVFilterLink *link = filter->inputs[i];                        \
 744         fmt_type fmt;                                                  \
 745                                                                        \
 746         if (!link->outcfg.list || link->outcfg.list->nb != 1)          \
 747             continue;                                                  \
 748         fmt = link->outcfg.list->var[0];                               \
 749                                                                        \
 750         for (j = 0; j < filter->nb_outputs; j++) {                     \
 751             AVFilterLink *out_link = filter->outputs[j];               \
 752             list_type *fmts;                                           \
 753                                                                        \
 754             if (link->type != out_link->type ||                        \
 755                 out_link->incfg.list->nb == 1)                         \
 756                 continue;                                              \
 757             fmts = out_link->incfg.list;                               \
 758                                                                        \
 759             if (!out_link->incfg.list->nb) {                           \
 760                 if ((ret = add_format(&out_link->incfg.list, fmt)) < 0)\
 761                     return ret;                                        \
 762                 ret = 1;                                               \
 763                 break;                                                 \
 764             }                                                          \
 765                                                                        \
 766             for (k = 0; k < out_link->incfg.list->nb; k++)             \
 767                 if (fmts->var[k] == fmt) {                             \
 768                     fmts->var[0]  = fmt;                               \
 769                     fmts->nb = 1;                                      \
 770                     ret = 1;                                           \
 771                     break;                                             \
 772                 }                                                      \
 773         }                                                              \
 774     }                                                                  \
 775 } while (0)
 776
 777 static int reduce_formats_on_filter(AVFilterContext *filter)
 778 {
 779     int i, j, k, ret = 0;
 780
 781     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 782                    nb_formats, ff_add_format);
 783     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 784                    nb_formats, ff_add_format);
 785
 786     /* reduce channel layouts */
 787     for (i = 0; i < filter->nb_inputs; i++) {
 788         AVFilterLink *inlink = filter->inputs[i];
 789         uint64_t fmt;
 790
 791         if (!inlink->outcfg.channel_layouts ||
 792             inlink->outcfg.channel_layouts->nb_channel_layouts != 1)
 793             continue;
 794         fmt = inlink->outcfg.channel_layouts->channel_layouts[0];
 795
 796         for (j = 0; j < filter->nb_outputs; j++) {
 797             AVFilterLink *outlink = filter->outputs[j];
 798             AVFilterChannelLayouts *fmts;
 799
 800             fmts = outlink->incfg.channel_layouts;
 801             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 802                 continue;
 803
 804             if (fmts->all_layouts &&
 805                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 806                 /* Turn the infinite list into a singleton */
 807                 fmts->all_layouts = fmts->all_counts  = 0;
 808                 if (ff_add_channel_layout(&outlink->incfg.channel_layouts, fmt) < 0)
 809                     ret = 1;
 810                 break;
 811             }
 812
 813             for (k = 0; k < outlink->incfg.channel_layouts->nb_channel_layouts; k++) {
 814                 if (fmts->channel_layouts[k] == fmt) {
 815                     fmts->channel_layouts[0]  = fmt;
 816                     fmts->nb_channel_layouts = 1;
 817                     ret = 1;
 818                     break;
 819                 }
 820             }
 821         }
 822     }
 823
 824     return ret;
 825 }
 826
 827 static int reduce_formats(AVFilterGraph *graph)
 828 {
 829     int i, reduced, ret;
 830
 831     do {
 832         reduced = 0;
 833
 834         for (i = 0; i < graph->nb_filters; i++) {
 835             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
 836                 return ret;
 837             reduced |= ret;
 838         }
 839     } while (reduced);
 840
 841     return 0;
 842 }
 843
 844 static void swap_samplerates_on_filter(AVFilterContext *filter)
 845 {
 846     AVFilterLink *link = NULL;
 847     int sample_rate;
 848     int i, j;
 849
 850     for (i = 0; i < filter->nb_inputs; i++) {
 851         link = filter->inputs[i];
 852
 853         if (link->type == AVMEDIA_TYPE_AUDIO &&
 854             link->outcfg.samplerates->nb_formats== 1)
 855             break;
 856     }
 857     if (i == filter->nb_inputs)
 858         return;
 859
 860     sample_rate = link->outcfg.samplerates->formats[0];
 861
 862     for (i = 0; i < filter->nb_outputs; i++) {
 863         AVFilterLink *outlink = filter->outputs[i];
 864         int best_idx, best_diff = INT_MAX;
 865
 866         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 867             outlink->incfg.samplerates->nb_formats < 2)
 868             continue;
 869
 870         for (j = 0; j < outlink->incfg.samplerates->nb_formats; j++) {
 871             int diff = abs(sample_rate - outlink->incfg.samplerates->formats[j]);
 872
 873             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
 874
 875             if (diff < best_diff) {
 876                 best_diff = diff;
 877                 best_idx  = j;
 878             }
 879         }
 880         FFSWAP(int, outlink->incfg.samplerates->formats[0],
 881                outlink->incfg.samplerates->formats[best_idx]);
 882     }
 883 }
 884
 885 static void swap_samplerates(AVFilterGraph *graph)
 886 {
 887     int i;
 888
 889     for (i = 0; i < graph->nb_filters; i++)
 890         swap_samplerates_on_filter(graph->filters[i]);
 891 }
 892
 893 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 894 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 895 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 896 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 897 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 898 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 899 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 900
 901 /* allowable substitutions for channel pairs when comparing layouts,
 902  * ordered by priority for both values */
 903 static const uint64_t ch_subst[][2] = {
 904     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 905     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 906     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 907     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 908     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 909     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 910     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 911     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 912     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 913     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 914     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 915     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 916     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 917     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 918     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 919     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 920     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 921     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 922     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 923     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 924     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 925 };
 926
 927 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 928 {
 929     AVFilterLink *link = NULL;
 930     int i, j, k;
 931
 932     for (i = 0; i < filter->nb_inputs; i++) {
 933         link = filter->inputs[i];
 934
 935         if (link->type == AVMEDIA_TYPE_AUDIO &&
 936             link->outcfg.channel_layouts->nb_channel_layouts == 1)
 937             break;
 938     }
 939     if (i == filter->nb_inputs)
 940         return;
 941
 942     for (i = 0; i < filter->nb_outputs; i++) {
 943         AVFilterLink *outlink = filter->outputs[i];
 944         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 945
 946         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 947             outlink->incfg.channel_layouts->nb_channel_layouts < 2)
 948             continue;
 949
 950         for (j = 0; j < outlink->incfg.channel_layouts->nb_channel_layouts; j++) {
 951             uint64_t  in_chlayout = link->outcfg.channel_layouts->channel_layouts[0];
 952             uint64_t out_chlayout = outlink->incfg.channel_layouts->channel_layouts[j];
 953             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 954             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 955             int count_diff        = out_channels - in_channels;
 956             int matched_channels, extra_channels;
 957             int score = 100000;
 958
 959             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 960                 /* Compute score in case the input or output layout encodes
 961                    a channel count; in this case the score is not altered by
 962                    the computation afterwards, as in_chlayout and
 963                    out_chlayout have both been set to 0 */
 964                 if (FF_LAYOUT2COUNT(in_chlayout))
 965                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 966                 if (FF_LAYOUT2COUNT(out_chlayout))
 967                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 968                 score -= 10000 + FFABS(out_channels - in_channels) +
 969                          (in_channels > out_channels ? 10000 : 0);
 970                 in_chlayout = out_chlayout = 0;
 971                 /* Let the remaining computation run, even if the score
 972                    value is not altered */
 973             }
 974
 975             /* channel substitution */
 976             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 977                 uint64_t cmp0 = ch_subst[k][0];
 978                 uint64_t cmp1 = ch_subst[k][1];
 979                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 980                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 981                     in_chlayout  &= ~cmp0;
 982                     out_chlayout &= ~cmp1;
 983                     /* add score for channel match, minus a deduction for
 984                        having to do the substitution */
 985                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 986                 }
 987             }
 988
 989             /* no penalty for LFE channel mismatch */
 990             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 991                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 992                 score += 10;
 993             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 994             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 995
 996             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 997                                                                  out_chlayout);
 998             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 999                                                                  (~in_chlayout));
1000             score += 10 * matched_channels - 5 * extra_channels;
1001
1002             if (score > best_score ||
1003                 (count_diff < best_count_diff && score == best_score)) {
1004                 best_score = score;
1005                 best_idx   = j;
1006                 best_count_diff = count_diff;
1007             }
1008         }
1009         av_assert0(best_idx >= 0);
1010         FFSWAP(uint64_t, outlink->incfg.channel_layouts->channel_layouts[0],
1011                outlink->incfg.channel_layouts->channel_layouts[best_idx]);
1012     }
1013
1014 }
1015
1016 static void swap_channel_layouts(AVFilterGraph *graph)
1017 {
1018     int i;
1019
1020     for (i = 0; i < graph->nb_filters; i++)
1021         swap_channel_layouts_on_filter(graph->filters[i]);
1022 }
1023
1024 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1025 {
1026     AVFilterLink *link = NULL;
1027     int format, bps;
1028     int i, j;
1029
1030     for (i = 0; i < filter->nb_inputs; i++) {
1031         link = filter->inputs[i];
1032
1033         if (link->type == AVMEDIA_TYPE_AUDIO &&
1034             link->outcfg.formats->nb_formats == 1)
1035             break;
1036     }
1037     if (i == filter->nb_inputs)
1038         return;
1039
1040     format = link->outcfg.formats->formats[0];
1041     bps    = av_get_bytes_per_sample(format);
1042
1043     for (i = 0; i < filter->nb_outputs; i++) {
1044         AVFilterLink *outlink = filter->outputs[i];
1045         int best_idx = -1, best_score = INT_MIN;
1046
1047         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1048             outlink->incfg.formats->nb_formats < 2)
1049             continue;
1050
1051         for (j = 0; j < outlink->incfg.formats->nb_formats; j++) {
1052             int out_format = outlink->incfg.formats->formats[j];
1053             int out_bps    = av_get_bytes_per_sample(out_format);
1054             int score;
1055
1056             if (av_get_packed_sample_fmt(out_format) == format ||
1057                 av_get_planar_sample_fmt(out_format) == format) {
1058                 best_idx   = j;
1059                 break;
1060             }
1061
1062             /* for s32 and float prefer double to prevent loss of information */
1063             if (bps == 4 && out_bps == 8) {
1064                 best_idx = j;
1065                 break;
1066             }
1067
1068             /* prefer closest higher or equal bps */
1069             score = -abs(out_bps - bps);
1070             if (out_bps >= bps)
1071                 score += INT_MAX/2;
1072
1073             if (score > best_score) {
1074                 best_score = score;
1075                 best_idx   = j;
1076             }
1077         }
1078         av_assert0(best_idx >= 0);
1079         FFSWAP(int, outlink->incfg.formats->formats[0],
1080                outlink->incfg.formats->formats[best_idx]);
1081     }
1082 }
1083
1084 static void swap_sample_fmts(AVFilterGraph *graph)
1085 {
1086     int i;
1087
1088     for (i = 0; i < graph->nb_filters; i++)
1089         swap_sample_fmts_on_filter(graph->filters[i]);
1090
1091 }
1092
1093 static int pick_formats(AVFilterGraph *graph)
1094 {
1095     int i, j, ret;
1096     int change;
1097
1098     do{
1099         change = 0;
1100         for (i = 0; i < graph->nb_filters; i++) {
1101             AVFilterContext *filter = graph->filters[i];
1102             if (filter->nb_inputs){
1103                 for (j = 0; j < filter->nb_inputs; j++){
1104                     if (filter->inputs[j]->incfg.formats && filter->inputs[j]->incfg.formats->nb_formats == 1) {
1105                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1106                             return ret;
1107                         change = 1;
1108                     }
1109                 }
1110             }
1111             if (filter->nb_outputs){
1112                 for (j = 0; j < filter->nb_outputs; j++){
1113                     if (filter->outputs[j]->incfg.formats && filter->outputs[j]->incfg.formats->nb_formats == 1) {
1114                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1115                             return ret;
1116                         change = 1;
1117                     }
1118                 }
1119             }
1120             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1121                 for (j = 0; j < filter->nb_outputs; j++) {
1122                     if (filter->outputs[j]->format<0) {
1123                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1124                             return ret;
1125                         change = 1;
1126                     }
1127                 }
1128             }
1129         }
1130     }while(change);
1131
1132     for (i = 0; i < graph->nb_filters; i++) {
1133         AVFilterContext *filter = graph->filters[i];
1134
1135         for (j = 0; j < filter->nb_inputs; j++)
1136             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1137                 return ret;
1138         for (j = 0; j < filter->nb_outputs; j++)
1139             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1140                 return ret;
1141     }
1142     return 0;
1143 }
1144
1145 /**
1146  * Configure the formats of all the links in the graph.
1147  */
1148 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1149 {
1150     int ret;
1151
1152     /* find supported formats from sub-filters, and merge along links */
1153     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1154         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1155     if (ret < 0)
1156         return ret;
1157
1158     /* Once everything is merged, it's possible that we'll still have
1159      * multiple valid media format choices. We try to minimize the amount
1160      * of format conversion inside filters */
1161     if ((ret = reduce_formats(graph)) < 0)
1162         return ret;
1163
1164     /* for audio filters, ensure the best format, sample rate and channel layout
1165      * is selected */
1166     swap_sample_fmts(graph);
1167     swap_samplerates(graph);
1168     swap_channel_layouts(graph);
1169
1170     if ((ret = pick_formats(graph)) < 0)
1171         return ret;
1172
1173     return 0;
1174 }
1175
1176 static int graph_config_pointers(AVFilterGraph *graph,
1177                                              AVClass *log_ctx)
1178 {
1179     unsigned i, j;
1180     int sink_links_count = 0, n = 0;
1181     AVFilterContext *f;
1182     AVFilterLink **sinks;
1183
1184     for (i = 0; i < graph->nb_filters; i++) {
1185         f = graph->filters[i];
1186         for (j = 0; j < f->nb_inputs; j++) {
1187             f->inputs[j]->graph     = graph;
1188             f->inputs[j]->age_index = -1;
1189         }
1190         for (j = 0; j < f->nb_outputs; j++) {
1191             f->outputs[j]->graph    = graph;
1192             f->outputs[j]->age_index= -1;
1193         }
1194         if (!f->nb_outputs) {
1195             if (f->nb_inputs > INT_MAX - sink_links_count)
1196                 return AVERROR(EINVAL);
1197             sink_links_count += f->nb_inputs;
1198         }
1199     }
1200     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1201     if (!sinks)
1202         return AVERROR(ENOMEM);
1203     for (i = 0; i < graph->nb_filters; i++) {
1204         f = graph->filters[i];
1205         if (!f->nb_outputs) {
1206             for (j = 0; j < f->nb_inputs; j++) {
1207                 sinks[n] = f->inputs[j];
1208                 f->inputs[j]->age_index = n++;
1209             }
1210         }
1211     }
1212     av_assert0(n == sink_links_count);
1213     graph->sink_links       = sinks;
1214     graph->sink_links_count = sink_links_count;
1215     return 0;
1216 }
1217
1218 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1219 {
1220     int ret;
1221
1222     if ((ret = graph_check_validity(graphctx, log_ctx)))
1223         return ret;
1224     if ((ret = graph_config_formats(graphctx, log_ctx)))
1225         return ret;
1226     if ((ret = graph_config_links(graphctx, log_ctx)))
1227         return ret;
1228     if ((ret = graph_check_links(graphctx, log_ctx)))
1229         return ret;
1230     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1231         return ret;
1232
1233     return 0;
1234 }
1235
1236 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1237 {
1238     int i, r = AVERROR(ENOSYS);
1239
1240     if (!graph)
1241         return r;
1242
1243     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1244         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1245         if (r != AVERROR(ENOSYS))
1246             return r;
1247     }
1248
1249     if (res_len && res)
1250         res[0] = 0;
1251
1252     for (i = 0; i < graph->nb_filters; i++) {
1253         AVFilterContext *filter = graph->filters[i];
1254         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1255             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1256             if (r != AVERROR(ENOSYS)) {
1257                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1258                     return r;
1259             }
1260         }
1261     }
1262
1263     return r;
1264 }
1265
1266 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1267 {
1268     int i;
1269
1270     if(!graph)
1271         return 0;
1272
1273     for (i = 0; i < graph->nb_filters; i++) {
1274         AVFilterContext *filter = graph->filters[i];
1275         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1276             AVFilterCommand **queue = &filter->command_queue, *next;
1277             while (*queue && (*queue)->time <= ts)
1278                 queue = &(*queue)->next;
1279             next = *queue;
1280             *queue = av_mallocz(sizeof(AVFilterCommand));
1281             if (!*queue)
1282                 return AVERROR(ENOMEM);
1283
1284             (*queue)->command = av_strdup(command);
1285             (*queue)->arg     = av_strdup(arg);
1286             (*queue)->time    = ts;
1287             (*queue)->flags   = flags;
1288             (*queue)->next    = next;
1289             if(flags & AVFILTER_CMD_FLAG_ONE)
1290                 return 0;
1291         }
1292     }
1293
1294     return 0;
1295 }
1296
1297 static void heap_bubble_up(AVFilterGraph *graph,
1298                            AVFilterLink *link, int index)
1299 {
1300     AVFilterLink **links = graph->sink_links;
1301
1302     av_assert0(index >= 0);
1303
1304     while (index) {
1305         int parent = (index - 1) >> 1;
1306         if (links[parent]->current_pts_us >= link->current_pts_us)
1307             break;
1308         links[index] = links[parent];
1309         links[index]->age_index = index;
1310         index = parent;
1311     }
1312     links[index] = link;
1313     link->age_index = index;
1314 }
1315
1316 static void heap_bubble_down(AVFilterGraph *graph,
1317                              AVFilterLink *link, int index)
1318 {
1319     AVFilterLink **links = graph->sink_links;
1320
1321     av_assert0(index >= 0);
1322
1323     while (1) {
1324         int child = 2 * index + 1;
1325         if (child >= graph->sink_links_count)
1326             break;
1327         if (child + 1 < graph->sink_links_count &&
1328             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1329             child++;
1330         if (link->current_pts_us < links[child]->current_pts_us)
1331             break;
1332         links[index] = links[child];
1333         links[index]->age_index = index;
1334         index = child;
1335     }
1336     links[index] = link;
1337     link->age_index = index;
1338 }
1339
1340 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1341 {
1342     heap_bubble_up  (graph, link, link->age_index);
1343     heap_bubble_down(graph, link, link->age_index);
1344 }
1345
1346 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1347 {
1348     AVFilterLink *oldest = graph->sink_links[0];
1349     int64_t frame_count;
1350     int r;
1351
1352     while (graph->sink_links_count) {
1353         oldest = graph->sink_links[0];
1354         if (oldest->dst->filter->activate) {
1355             /* For now, buffersink is the only filter implementing activate. */
1356             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1357                                               AV_BUFFERSINK_FLAG_PEEK);
1358             if (r != AVERROR_EOF)
1359                 return r;
1360         } else {
1361             r = ff_request_frame(oldest);
1362         }
1363         if (r != AVERROR_EOF)
1364             break;
1365         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1366                oldest->dst ? oldest->dst->name : "unknown",
1367                oldest->dstpad ? oldest->dstpad->name : "unknown");
1368         /* EOF: remove the link from the heap */
1369         if (oldest->age_index < --graph->sink_links_count)
1370             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1371                              oldest->age_index);
1372         oldest->age_index = -1;
1373     }
1374     if (!graph->sink_links_count)
1375         return AVERROR_EOF;
1376     av_assert1(!oldest->dst->filter->activate);
1377     av_assert1(oldest->age_index >= 0);
1378     frame_count = oldest->frame_count_out;
1379     while (frame_count == oldest->frame_count_out) {
1380         r = ff_filter_graph_run_once(graph);
1381         if (r == AVERROR(EAGAIN) &&
1382             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1383             !oldest->status_in)
1384             ff_request_frame(oldest);
1385         else if (r < 0)
1386             return r;
1387     }
1388     return 0;
1389 }
1390
1391 int ff_filter_graph_run_once(AVFilterGraph *graph)
1392 {
1393     AVFilterContext *filter;
1394     unsigned i;
1395
1396     av_assert0(graph->nb_filters);
1397     filter = graph->filters[0];
1398     for (i = 1; i < graph->nb_filters; i++)
1399         if (graph->filters[i]->ready > filter->ready)
1400             filter = graph->filters[i];
1401     if (!filter->ready)
1402         return AVERROR(EAGAIN);
1403     return ff_filter_activate(filter);
1404 }