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