git.sesse.net Git - ffmpeg/blob - libavfilter/avfiltergraph.c

   1 /*
   2  * filter graphs
   3  * Copyright (c) 2008 Vitor Sessak
   4  * Copyright (c) 2007 Bobby Bingham
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include <string.h>
  26
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/avstring.h"
  29 #include "libavutil/bprint.h"
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/internal.h"
  32 #include "libavutil/opt.h"
  33 #include "libavutil/pixdesc.h"
  34 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
  35
  36 #include "avfilter.h"
  37 #include "formats.h"
  38 #include "internal.h"
  39 #include "thread.h"
  40
  41 #define OFFSET(x) offsetof(AVFilterGraph, x)
  42 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  43 static const AVOption filtergraph_options[] = {
  44     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  45         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
  46         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
  47     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  48         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
  49     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  50         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  51     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  52         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  53     { NULL },
  54 };
  55
  56 static const AVClass filtergraph_class = {
  57     .class_name = "AVFilterGraph",
  58     .item_name  = av_default_item_name,
  59     .version    = LIBAVUTIL_VERSION_INT,
  60     .option     = filtergraph_options,
  61     .category   = AV_CLASS_CATEGORY_FILTER,
  62 };
  63
  64 #if !HAVE_THREADS
  65 void ff_graph_thread_free(AVFilterGraph *graph)
  66 {
  67 }
  68
  69 int ff_graph_thread_init(AVFilterGraph *graph)
  70 {
  71     graph->thread_type = 0;
  72     graph->nb_threads  = 1;
  73     return 0;
  74 }
  75 #endif
  76
  77 AVFilterGraph *avfilter_graph_alloc(void)
  78 {
  79     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  80     if (!ret)
  81         return NULL;
  82
  83     ret->internal = av_mallocz(sizeof(*ret->internal));
  84     if (!ret->internal) {
  85         av_freep(&ret);
  86         return NULL;
  87     }
  88
  89     ret->av_class = &filtergraph_class;
  90     av_opt_set_defaults(ret);
  91
  92     return ret;
  93 }
  94
  95 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
  96 {
  97     int i;
  98     for (i = 0; i < graph->nb_filters; i++) {
  99         if (graph->filters[i] == filter) {
 100             FFSWAP(AVFilterContext*, graph->filters[i],
 101                    graph->filters[graph->nb_filters - 1]);
 102             graph->nb_filters--;
 103             return;
 104         }
 105     }
 106 }
 107
 108 void avfilter_graph_free(AVFilterGraph **graph)
 109 {
 110     if (!*graph)
 111         return;
 112
 113     while ((*graph)->nb_filters)
 114         avfilter_free((*graph)->filters[0]);
 115
 116     ff_graph_thread_free(*graph);
 117
 118     av_freep(&(*graph)->sink_links);
 119
 120     av_freep(&(*graph)->scale_sws_opts);
 121     av_freep(&(*graph)->aresample_swr_opts);
 122     av_freep(&(*graph)->resample_lavr_opts);
 123     av_freep(&(*graph)->filters);
 124     av_freep(&(*graph)->internal);
 125     av_freep(graph);
 126 }
 127
 128 #if FF_API_AVFILTER_OPEN
 129 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 130 {
 131     AVFilterContext **filters = av_realloc(graph->filters,
 132                                            sizeof(*filters) * (graph->nb_filters + 1));
 133     if (!filters)
 134         return AVERROR(ENOMEM);
 135
 136     graph->filters = filters;
 137     graph->filters[graph->nb_filters++] = filter;
 138
 139 #if FF_API_FOO_COUNT
 140 FF_DISABLE_DEPRECATION_WARNINGS
 141     graph->filter_count_unused = graph->nb_filters;
 142 FF_ENABLE_DEPRECATION_WARNINGS
 143 #endif
 144
 145     filter->graph = graph;
 146
 147     return 0;
 148 }
 149 #endif
 150
 151 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 152                                  const char *name, const char *args, void *opaque,
 153                                  AVFilterGraph *graph_ctx)
 154 {
 155     int ret;
 156
 157     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 158     if (!*filt_ctx)
 159         return AVERROR(ENOMEM);
 160
 161     ret = avfilter_init_str(*filt_ctx, args);
 162     if (ret < 0)
 163         goto fail;
 164
 165     return 0;
 166
 167 fail:
 168     if (*filt_ctx)
 169         avfilter_free(*filt_ctx);
 170     *filt_ctx = NULL;
 171     return ret;
 172 }
 173
 174 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 175 {
 176     graph->disable_auto_convert = flags;
 177 }
 178
 179 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 180                                              const AVFilter *filter,
 181                                              const char *name)
 182 {
 183     AVFilterContext **filters, *s;
 184
 185     if (graph->thread_type && !graph->internal->thread) {
 186         int ret = ff_graph_thread_init(graph);
 187         if (ret < 0) {
 188             av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
 189             return NULL;
 190         }
 191     }
 192
 193     s = ff_filter_alloc(filter, name);
 194     if (!s)
 195         return NULL;
 196
 197     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 198     if (!filters) {
 199         avfilter_free(s);
 200         return NULL;
 201     }
 202
 203     graph->filters = filters;
 204     graph->filters[graph->nb_filters++] = s;
 205
 206 #if FF_API_FOO_COUNT
 207 FF_DISABLE_DEPRECATION_WARNINGS
 208     graph->filter_count_unused = graph->nb_filters;
 209 FF_ENABLE_DEPRECATION_WARNINGS
 210 #endif
 211
 212     s->graph = graph;
 213
 214     return s;
 215 }
 216
 217 /**
 218  * Check for the validity of graph.
 219  *
 220  * A graph is considered valid if all its input and output pads are
 221  * connected.
 222  *
 223  * @return 0 in case of success, a negative value otherwise
 224  */
 225 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 226 {
 227     AVFilterContext *filt;
 228     int i, j;
 229
 230     for (i = 0; i < graph->nb_filters; i++) {
 231         const AVFilterPad *pad;
 232         filt = graph->filters[i];
 233
 234         for (j = 0; j < filt->nb_inputs; j++) {
 235             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 236                 pad = &filt->input_pads[j];
 237                 av_log(log_ctx, AV_LOG_ERROR,
 238                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 239                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 240                 return AVERROR(EINVAL);
 241             }
 242         }
 243
 244         for (j = 0; j < filt->nb_outputs; j++) {
 245             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 246                 pad = &filt->output_pads[j];
 247                 av_log(log_ctx, AV_LOG_ERROR,
 248                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 249                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 250                 return AVERROR(EINVAL);
 251             }
 252         }
 253     }
 254
 255     return 0;
 256 }
 257
 258 /**
 259  * Configure all the links of graphctx.
 260  *
 261  * @return 0 in case of success, a negative value otherwise
 262  */
 263 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 264 {
 265     AVFilterContext *filt;
 266     int i, ret;
 267
 268     for (i = 0; i < graph->nb_filters; i++) {
 269         filt = graph->filters[i];
 270
 271         if (!filt->nb_outputs) {
 272             if ((ret = avfilter_config_links(filt)))
 273                 return ret;
 274         }
 275     }
 276
 277     return 0;
 278 }
 279
 280 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 281 {
 282     int i;
 283
 284     for (i = 0; i < graph->nb_filters; i++)
 285         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 286             return graph->filters[i];
 287
 288     return NULL;
 289 }
 290
 291 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 292 {
 293     if (!l)
 294         return;
 295     if (l->nb_channel_layouts) {
 296         if (l->all_layouts || l->all_counts)
 297             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 298         l->all_layouts = l->all_counts = 0;
 299     } else {
 300         if (l->all_counts && !l->all_layouts)
 301             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 302         l->all_layouts = 1;
 303     }
 304 }
 305
 306 static int filter_query_formats(AVFilterContext *ctx)
 307 {
 308     int ret, i;
 309     AVFilterFormats *formats;
 310     AVFilterChannelLayouts *chlayouts;
 311     AVFilterFormats *samplerates;
 312     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 313                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 314                             AVMEDIA_TYPE_VIDEO;
 315
 316     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 317         if (ret != AVERROR(EAGAIN))
 318             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 319                    ctx->name, av_err2str(ret));
 320         return ret;
 321     }
 322
 323     for (i = 0; i < ctx->nb_inputs; i++)
 324         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 325     for (i = 0; i < ctx->nb_outputs; i++)
 326         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 327
 328     formats = ff_all_formats(type);
 329     if (!formats)
 330         return AVERROR(ENOMEM);
 331     ff_set_common_formats(ctx, formats);
 332     if (type == AVMEDIA_TYPE_AUDIO) {
 333         samplerates = ff_all_samplerates();
 334         if (!samplerates)
 335             return AVERROR(ENOMEM);
 336         ff_set_common_samplerates(ctx, samplerates);
 337         chlayouts = ff_all_channel_layouts();
 338         if (!chlayouts)
 339             return AVERROR(ENOMEM);
 340         ff_set_common_channel_layouts(ctx, chlayouts);
 341     }
 342     return 0;
 343 }
 344
 345 static int formats_declared(AVFilterContext *f)
 346 {
 347     int i;
 348
 349     for (i = 0; i < f->nb_inputs; i++) {
 350         if (!f->inputs[i]->out_formats)
 351             return 0;
 352         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 353             !(f->inputs[i]->out_samplerates &&
 354               f->inputs[i]->out_channel_layouts))
 355             return 0;
 356     }
 357     for (i = 0; i < f->nb_outputs; i++) {
 358         if (!f->outputs[i]->in_formats)
 359             return 0;
 360         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 361             !(f->outputs[i]->in_samplerates &&
 362               f->outputs[i]->in_channel_layouts))
 363             return 0;
 364     }
 365     return 1;
 366 }
 367
 368 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 369 {
 370     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 371     if (a) {
 372         a->refcount = 0;
 373         a->refs     = NULL;
 374         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 375         if (!a->formats && arg->formats)
 376             av_freep(&a);
 377     }
 378     return a;
 379 }
 380
 381 static int can_merge_formats(AVFilterFormats *a_arg,
 382                              AVFilterFormats *b_arg,
 383                              enum AVMediaType type,
 384                              int is_sample_rate)
 385 {
 386     AVFilterFormats *a, *b, *ret;
 387     if (a_arg == b_arg)
 388         return 1;
 389     a = clone_filter_formats(a_arg);
 390     b = clone_filter_formats(b_arg);
 391     if (is_sample_rate) {
 392         ret = ff_merge_samplerates(a, b);
 393     } else {
 394         ret = ff_merge_formats(a, b, type);
 395     }
 396     if (ret) {
 397         av_freep(&ret->formats);
 398         av_freep(&ret->refs);
 399         av_freep(&ret);
 400         return 1;
 401     } else {
 402         av_freep(&a->formats);
 403         av_freep(&b->formats);
 404         av_freep(&a);
 405         av_freep(&b);
 406         return 0;
 407     }
 408 }
 409
 410 /**
 411  * Perform one round of query_formats() and merging formats lists on the
 412  * filter graph.
 413  * @return  >=0 if all links formats lists could be queried and merged;
 414  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 415  *          and a later call may succeed;
 416  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 417  *          was made and the negotiation is stuck;
 418  *          a negative error code if some other error happened
 419  */
 420 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 421 {
 422     int i, j, ret;
 423     int scaler_count = 0, resampler_count = 0;
 424     int count_queried = 0;        /* successful calls to query_formats() */
 425     int count_merged = 0;         /* successful merge of formats lists */
 426     int count_already_merged = 0; /* lists already merged */
 427     int count_delayed = 0;        /* lists that need to be merged later */
 428
 429     for (i = 0; i < graph->nb_filters; i++) {
 430         AVFilterContext *f = graph->filters[i];
 431         if (formats_declared(f))
 432             continue;
 433         if (f->filter->query_formats)
 434             ret = filter_query_formats(f);
 435         else
 436             ret = ff_default_query_formats(f);
 437         if (ret < 0 && ret != AVERROR(EAGAIN))
 438             return ret;
 439         /* note: EAGAIN could indicate a partial success, not counted yet */
 440         count_queried += ret >= 0;
 441     }
 442
 443     /* go through and merge as many format lists as possible */
 444     for (i = 0; i < graph->nb_filters; i++) {
 445         AVFilterContext *filter = graph->filters[i];
 446
 447         for (j = 0; j < filter->nb_inputs; j++) {
 448             AVFilterLink *link = filter->inputs[j];
 449             int convert_needed = 0;
 450
 451             if (!link)
 452                 continue;
 453
 454             if (link->in_formats != link->out_formats
 455                 && link->in_formats && link->out_formats)
 456                 if (!can_merge_formats(link->in_formats, link->out_formats,
 457                                       link->type, 0))
 458                     convert_needed = 1;
 459             if (link->type == AVMEDIA_TYPE_AUDIO) {
 460                 if (link->in_samplerates != link->out_samplerates
 461                     && link->in_samplerates && link->out_samplerates)
 462                     if (!can_merge_formats(link->in_samplerates,
 463                                            link->out_samplerates,
 464                                            0, 1))
 465                         convert_needed = 1;
 466             }
 467
 468 #define MERGE_DISPATCH(field, statement)                                     \
 469             if (!(link->in_ ## field && link->out_ ## field)) {              \
 470                 count_delayed++;                                             \
 471             } else if (link->in_ ## field == link->out_ ## field) {          \
 472                 count_already_merged++;                                      \
 473             } else if (!convert_needed) {                                    \
 474                 count_merged++;                                              \
 475                 statement                                                    \
 476             }
 477
 478             if (link->type == AVMEDIA_TYPE_AUDIO) {
 479                 MERGE_DISPATCH(channel_layouts,
 480                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 481                                                   link->out_channel_layouts))
 482                         convert_needed = 1;
 483                 )
 484                 MERGE_DISPATCH(samplerates,
 485                     if (!ff_merge_samplerates(link->in_samplerates,
 486                                               link->out_samplerates))
 487                         convert_needed = 1;
 488                 )
 489             }
 490             MERGE_DISPATCH(formats,
 491                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 492                                       link->type))
 493                     convert_needed = 1;
 494             )
 495 #undef MERGE_DISPATCH
 496
 497             if (convert_needed) {
 498                 AVFilterContext *convert;
 499                 AVFilter *filter;
 500                 AVFilterLink *inlink, *outlink;
 501                 char scale_args[256];
 502                 char inst_name[30];
 503
 504                 /* couldn't merge format lists. auto-insert conversion filter */
 505                 switch (link->type) {
 506                 case AVMEDIA_TYPE_VIDEO:
 507                     if (!(filter = avfilter_get_by_name("scale"))) {
 508                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 509                                "not present, cannot convert pixel formats.\n");
 510                         return AVERROR(EINVAL);
 511                     }
 512
 513                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 514                              scaler_count++);
 515
 516                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 517                                                             inst_name, graph->scale_sws_opts, NULL,
 518                                                             graph)) < 0)
 519                         return ret;
 520                     break;
 521                 case AVMEDIA_TYPE_AUDIO:
 522                     if (!(filter = avfilter_get_by_name("aresample"))) {
 523                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 524                                "not present, cannot convert audio formats.\n");
 525                         return AVERROR(EINVAL);
 526                     }
 527
 528                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 529                              resampler_count++);
 530                     scale_args[0] = '\0';
 531                     if (graph->aresample_swr_opts)
 532                         snprintf(scale_args, sizeof(scale_args), "%s",
 533                                  graph->aresample_swr_opts);
 534                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 535                                                             inst_name, graph->aresample_swr_opts,
 536                                                             NULL, graph)) < 0)
 537                         return ret;
 538                     break;
 539                 default:
 540                     return AVERROR(EINVAL);
 541                 }
 542
 543                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 544                     return ret;
 545
 546                 filter_query_formats(convert);
 547                 inlink  = convert->inputs[0];
 548                 outlink = convert->outputs[0];
 549                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 550                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 551                     ret |= AVERROR(ENOSYS);
 552                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 553                     (!ff_merge_samplerates(inlink->in_samplerates,
 554                                            inlink->out_samplerates) ||
 555                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 556                                                inlink->out_channel_layouts)))
 557                     ret |= AVERROR(ENOSYS);
 558                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 559                     (!ff_merge_samplerates(outlink->in_samplerates,
 560                                            outlink->out_samplerates) ||
 561                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 562                                                outlink->out_channel_layouts)))
 563                     ret |= AVERROR(ENOSYS);
 564
 565                 if (ret < 0) {
 566                     av_log(log_ctx, AV_LOG_ERROR,
 567                            "Impossible to convert between the formats supported by the filter "
 568                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 569                     return ret;
 570                 }
 571             }
 572         }
 573     }
 574
 575     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 576            "%d queried, %d merged, %d already done, %d delayed\n",
 577            count_queried, count_merged, count_already_merged, count_delayed);
 578     if (count_delayed) {
 579         AVBPrint bp;
 580
 581         /* if count_queried > 0, one filter at least did set its formats,
 582            that will give additional information to its neighbour;
 583            if count_merged > 0, one pair of formats lists at least was merged,
 584            that will give additional information to all connected filters;
 585            in both cases, progress was made and a new round must be done */
 586         if (count_queried || count_merged)
 587             return AVERROR(EAGAIN);
 588         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 589         for (i = 0; i < graph->nb_filters; i++)
 590             if (!formats_declared(graph->filters[i]))
 591                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 592                           graph->filters[i]->name);
 593         av_log(graph, AV_LOG_ERROR,
 594                "The following filters could not choose their formats: %s\n"
 595                "Consider inserting the (a)format filter near their input or "
 596                "output.\n", bp.str);
 597         return AVERROR(EIO);
 598     }
 599     return 0;
 600 }
 601
 602 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 603 {
 604     if (!link || !link->in_formats)
 605         return 0;
 606
 607     if (link->type == AVMEDIA_TYPE_VIDEO) {
 608         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 609             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 610             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 611             int i;
 612             for (i=0; i<link->in_formats->nb_formats; i++) {
 613                 enum AVPixelFormat p = link->in_formats->formats[i];
 614                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 615             }
 616             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 617                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 618                    av_get_pix_fmt_name(ref->format), has_alpha);
 619             link->in_formats->formats[0] = best;
 620         }
 621     }
 622
 623     link->in_formats->nb_formats = 1;
 624     link->format = link->in_formats->formats[0];
 625
 626     if (link->type == AVMEDIA_TYPE_AUDIO) {
 627         if (!link->in_samplerates->nb_formats) {
 628             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 629                    " the link between filters %s and %s.\n", link->src->name,
 630                    link->dst->name);
 631             return AVERROR(EINVAL);
 632         }
 633         link->in_samplerates->nb_formats = 1;
 634         link->sample_rate = link->in_samplerates->formats[0];
 635
 636         if (link->in_channel_layouts->all_layouts) {
 637             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 638                    " the link between filters %s and %s.\n", link->src->name,
 639                    link->dst->name);
 640             return AVERROR(EINVAL);
 641         }
 642         link->in_channel_layouts->nb_channel_layouts = 1;
 643         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 644         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 645             link->channel_layout = 0;
 646         else
 647             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 648     }
 649
 650     ff_formats_unref(&link->in_formats);
 651     ff_formats_unref(&link->out_formats);
 652     ff_formats_unref(&link->in_samplerates);
 653     ff_formats_unref(&link->out_samplerates);
 654     ff_channel_layouts_unref(&link->in_channel_layouts);
 655     ff_channel_layouts_unref(&link->out_channel_layouts);
 656
 657     return 0;
 658 }
 659
 660 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 661 do {                                                                   \
 662     for (i = 0; i < filter->nb_inputs; i++) {                          \
 663         AVFilterLink *link = filter->inputs[i];                        \
 664         fmt_type fmt;                                                  \
 665                                                                        \
 666         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 667             continue;                                                  \
 668         fmt = link->out_ ## list->var[0];                              \
 669                                                                        \
 670         for (j = 0; j < filter->nb_outputs; j++) {                     \
 671             AVFilterLink *out_link = filter->outputs[j];               \
 672             list_type *fmts;                                           \
 673                                                                        \
 674             if (link->type != out_link->type ||                        \
 675                 out_link->in_ ## list->nb == 1)                        \
 676                 continue;                                              \
 677             fmts = out_link->in_ ## list;                              \
 678                                                                        \
 679             if (!out_link->in_ ## list->nb) {                          \
 680                 add_format(&out_link->in_ ##list, fmt);                \
 681                 ret = 1;                                               \
 682                 break;                                                 \
 683             }                                                          \
 684                                                                        \
 685             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 686                 if (fmts->var[k] == fmt) {                             \
 687                     fmts->var[0]  = fmt;                               \
 688                     fmts->nb = 1;                                      \
 689                     ret = 1;                                           \
 690                     break;                                             \
 691                 }                                                      \
 692         }                                                              \
 693     }                                                                  \
 694 } while (0)
 695
 696 static int reduce_formats_on_filter(AVFilterContext *filter)
 697 {
 698     int i, j, k, ret = 0;
 699
 700     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 701                    nb_formats, ff_add_format);
 702     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 703                    nb_formats, ff_add_format);
 704
 705     /* reduce channel layouts */
 706     for (i = 0; i < filter->nb_inputs; i++) {
 707         AVFilterLink *inlink = filter->inputs[i];
 708         uint64_t fmt;
 709
 710         if (!inlink->out_channel_layouts ||
 711             inlink->out_channel_layouts->nb_channel_layouts != 1)
 712             continue;
 713         fmt = inlink->out_channel_layouts->channel_layouts[0];
 714
 715         for (j = 0; j < filter->nb_outputs; j++) {
 716             AVFilterLink *outlink = filter->outputs[j];
 717             AVFilterChannelLayouts *fmts;
 718
 719             fmts = outlink->in_channel_layouts;
 720             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 721                 continue;
 722
 723             if (fmts->all_layouts) {
 724                 /* Turn the infinite list into a singleton */
 725                 fmts->all_layouts = fmts->all_counts  = 0;
 726                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 727                 break;
 728             }
 729
 730             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 731                 if (fmts->channel_layouts[k] == fmt) {
 732                     fmts->channel_layouts[0]  = fmt;
 733                     fmts->nb_channel_layouts = 1;
 734                     ret = 1;
 735                     break;
 736                 }
 737             }
 738         }
 739     }
 740
 741     return ret;
 742 }
 743
 744 static void reduce_formats(AVFilterGraph *graph)
 745 {
 746     int i, reduced;
 747
 748     do {
 749         reduced = 0;
 750
 751         for (i = 0; i < graph->nb_filters; i++)
 752             reduced |= reduce_formats_on_filter(graph->filters[i]);
 753     } while (reduced);
 754 }
 755
 756 static void swap_samplerates_on_filter(AVFilterContext *filter)
 757 {
 758     AVFilterLink *link = NULL;
 759     int sample_rate;
 760     int i, j;
 761
 762     for (i = 0; i < filter->nb_inputs; i++) {
 763         link = filter->inputs[i];
 764
 765         if (link->type == AVMEDIA_TYPE_AUDIO &&
 766             link->out_samplerates->nb_formats== 1)
 767             break;
 768     }
 769     if (i == filter->nb_inputs)
 770         return;
 771
 772     sample_rate = link->out_samplerates->formats[0];
 773
 774     for (i = 0; i < filter->nb_outputs; i++) {
 775         AVFilterLink *outlink = filter->outputs[i];
 776         int best_idx, best_diff = INT_MAX;
 777
 778         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 779             outlink->in_samplerates->nb_formats < 2)
 780             continue;
 781
 782         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 783             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 784
 785             if (diff < best_diff) {
 786                 best_diff = diff;
 787                 best_idx  = j;
 788             }
 789         }
 790         FFSWAP(int, outlink->in_samplerates->formats[0],
 791                outlink->in_samplerates->formats[best_idx]);
 792     }
 793 }
 794
 795 static void swap_samplerates(AVFilterGraph *graph)
 796 {
 797     int i;
 798
 799     for (i = 0; i < graph->nb_filters; i++)
 800         swap_samplerates_on_filter(graph->filters[i]);
 801 }
 802
 803 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 804 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 805 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 806 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 807 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 808 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 809 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 810
 811 /* allowable substitutions for channel pairs when comparing layouts,
 812  * ordered by priority for both values */
 813 static const uint64_t ch_subst[][2] = {
 814     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 815     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 816     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 817     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 818     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 819     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 820     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 821     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 822     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 823     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 824     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 825     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 826     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 827     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 828     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 829     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 830     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 831     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 832     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 833     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 834     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 835 };
 836
 837 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 838 {
 839     AVFilterLink *link = NULL;
 840     int i, j, k;
 841
 842     for (i = 0; i < filter->nb_inputs; i++) {
 843         link = filter->inputs[i];
 844
 845         if (link->type == AVMEDIA_TYPE_AUDIO &&
 846             link->out_channel_layouts->nb_channel_layouts == 1)
 847             break;
 848     }
 849     if (i == filter->nb_inputs)
 850         return;
 851
 852     for (i = 0; i < filter->nb_outputs; i++) {
 853         AVFilterLink *outlink = filter->outputs[i];
 854         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 855
 856         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 857             outlink->in_channel_layouts->nb_channel_layouts < 2)
 858             continue;
 859
 860         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 861             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 862             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 863             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 864             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 865             int count_diff        = out_channels - in_channels;
 866             int matched_channels, extra_channels;
 867             int score = 100000;
 868
 869             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 870                 /* Compute score in case the input or output layout encodes
 871                    a channel count; in this case the score is not altered by
 872                    the computation afterwards, as in_chlayout and
 873                    out_chlayout have both been set to 0 */
 874                 if (FF_LAYOUT2COUNT(in_chlayout))
 875                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 876                 if (FF_LAYOUT2COUNT(out_chlayout))
 877                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 878                 score -= 10000 + FFABS(out_channels - in_channels) +
 879                          (in_channels > out_channels ? 10000 : 0);
 880                 in_chlayout = out_chlayout = 0;
 881                 /* Let the remaining computation run, even if the score
 882                    value is not altered */
 883             }
 884
 885             /* channel substitution */
 886             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 887                 uint64_t cmp0 = ch_subst[k][0];
 888                 uint64_t cmp1 = ch_subst[k][1];
 889                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 890                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 891                     in_chlayout  &= ~cmp0;
 892                     out_chlayout &= ~cmp1;
 893                     /* add score for channel match, minus a deduction for
 894                        having to do the substitution */
 895                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 896                 }
 897             }
 898
 899             /* no penalty for LFE channel mismatch */
 900             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 901                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 902                 score += 10;
 903             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 904             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 905
 906             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 907                                                                  out_chlayout);
 908             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 909                                                                  (~in_chlayout));
 910             score += 10 * matched_channels - 5 * extra_channels;
 911
 912             if (score > best_score ||
 913                 (count_diff < best_count_diff && score == best_score)) {
 914                 best_score = score;
 915                 best_idx   = j;
 916                 best_count_diff = count_diff;
 917             }
 918         }
 919         av_assert0(best_idx >= 0);
 920         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 921                outlink->in_channel_layouts->channel_layouts[best_idx]);
 922     }
 923
 924 }
 925
 926 static void swap_channel_layouts(AVFilterGraph *graph)
 927 {
 928     int i;
 929
 930     for (i = 0; i < graph->nb_filters; i++)
 931         swap_channel_layouts_on_filter(graph->filters[i]);
 932 }
 933
 934 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 935 {
 936     AVFilterLink *link = NULL;
 937     int format, bps;
 938     int i, j;
 939
 940     for (i = 0; i < filter->nb_inputs; i++) {
 941         link = filter->inputs[i];
 942
 943         if (link->type == AVMEDIA_TYPE_AUDIO &&
 944             link->out_formats->nb_formats == 1)
 945             break;
 946     }
 947     if (i == filter->nb_inputs)
 948         return;
 949
 950     format = link->out_formats->formats[0];
 951     bps    = av_get_bytes_per_sample(format);
 952
 953     for (i = 0; i < filter->nb_outputs; i++) {
 954         AVFilterLink *outlink = filter->outputs[i];
 955         int best_idx = -1, best_score = INT_MIN;
 956
 957         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 958             outlink->in_formats->nb_formats < 2)
 959             continue;
 960
 961         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
 962             int out_format = outlink->in_formats->formats[j];
 963             int out_bps    = av_get_bytes_per_sample(out_format);
 964             int score;
 965
 966             if (av_get_packed_sample_fmt(out_format) == format ||
 967                 av_get_planar_sample_fmt(out_format) == format) {
 968                 best_idx   = j;
 969                 break;
 970             }
 971
 972             /* for s32 and float prefer double to prevent loss of information */
 973             if (bps == 4 && out_bps == 8) {
 974                 best_idx = j;
 975                 break;
 976             }
 977
 978             /* prefer closest higher or equal bps */
 979             score = -abs(out_bps - bps);
 980             if (out_bps >= bps)
 981                 score += INT_MAX/2;
 982
 983             if (score > best_score) {
 984                 best_score = score;
 985                 best_idx   = j;
 986             }
 987         }
 988         av_assert0(best_idx >= 0);
 989         FFSWAP(int, outlink->in_formats->formats[0],
 990                outlink->in_formats->formats[best_idx]);
 991     }
 992 }
 993
 994 static void swap_sample_fmts(AVFilterGraph *graph)
 995 {
 996     int i;
 997
 998     for (i = 0; i < graph->nb_filters; i++)
 999         swap_sample_fmts_on_filter(graph->filters[i]);
1000
1001 }
1002
1003 static int pick_formats(AVFilterGraph *graph)
1004 {
1005     int i, j, ret;
1006     int change;
1007
1008     do{
1009         change = 0;
1010         for (i = 0; i < graph->nb_filters; i++) {
1011             AVFilterContext *filter = graph->filters[i];
1012             if (filter->nb_inputs){
1013                 for (j = 0; j < filter->nb_inputs; j++){
1014                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1015                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1016                             return ret;
1017                         change = 1;
1018                     }
1019                 }
1020             }
1021             if (filter->nb_outputs){
1022                 for (j = 0; j < filter->nb_outputs; j++){
1023                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1024                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1025                             return ret;
1026                         change = 1;
1027                     }
1028                 }
1029             }
1030             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1031                 for (j = 0; j < filter->nb_outputs; j++) {
1032                     if(filter->outputs[j]->format<0) {
1033                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1034                             return ret;
1035                         change = 1;
1036                     }
1037                 }
1038             }
1039         }
1040     }while(change);
1041
1042     for (i = 0; i < graph->nb_filters; i++) {
1043         AVFilterContext *filter = graph->filters[i];
1044
1045         for (j = 0; j < filter->nb_inputs; j++)
1046             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1047                 return ret;
1048         for (j = 0; j < filter->nb_outputs; j++)
1049             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1050                 return ret;
1051     }
1052     return 0;
1053 }
1054
1055 /**
1056  * Configure the formats of all the links in the graph.
1057  */
1058 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1059 {
1060     int ret;
1061
1062     /* find supported formats from sub-filters, and merge along links */
1063     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1064         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1065     if (ret < 0)
1066         return ret;
1067
1068     /* Once everything is merged, it's possible that we'll still have
1069      * multiple valid media format choices. We try to minimize the amount
1070      * of format conversion inside filters */
1071     reduce_formats(graph);
1072
1073     /* for audio filters, ensure the best format, sample rate and channel layout
1074      * is selected */
1075     swap_sample_fmts(graph);
1076     swap_samplerates(graph);
1077     swap_channel_layouts(graph);
1078
1079     if ((ret = pick_formats(graph)) < 0)
1080         return ret;
1081
1082     return 0;
1083 }
1084
1085 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
1086                                              AVClass *log_ctx)
1087 {
1088     unsigned i, j;
1089     int sink_links_count = 0, n = 0;
1090     AVFilterContext *f;
1091     AVFilterLink **sinks;
1092
1093     for (i = 0; i < graph->nb_filters; i++) {
1094         f = graph->filters[i];
1095         for (j = 0; j < f->nb_inputs; j++) {
1096             f->inputs[j]->graph     = graph;
1097             f->inputs[j]->age_index = -1;
1098         }
1099         for (j = 0; j < f->nb_outputs; j++) {
1100             f->outputs[j]->graph    = graph;
1101             f->outputs[j]->age_index= -1;
1102         }
1103         if (!f->nb_outputs) {
1104             if (f->nb_inputs > INT_MAX - sink_links_count)
1105                 return AVERROR(EINVAL);
1106             sink_links_count += f->nb_inputs;
1107         }
1108     }
1109     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1110     if (!sinks)
1111         return AVERROR(ENOMEM);
1112     for (i = 0; i < graph->nb_filters; i++) {
1113         f = graph->filters[i];
1114         if (!f->nb_outputs) {
1115             for (j = 0; j < f->nb_inputs; j++) {
1116                 sinks[n] = f->inputs[j];
1117                 f->inputs[j]->age_index = n++;
1118             }
1119         }
1120     }
1121     av_assert0(n == sink_links_count);
1122     graph->sink_links       = sinks;
1123     graph->sink_links_count = sink_links_count;
1124     return 0;
1125 }
1126
1127 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1128 {
1129     AVFilterContext *f;
1130     int i, j, ret;
1131     int fifo_count = 0;
1132
1133     for (i = 0; i < graph->nb_filters; i++) {
1134         f = graph->filters[i];
1135
1136         for (j = 0; j < f->nb_inputs; j++) {
1137             AVFilterLink *link = f->inputs[j];
1138             AVFilterContext *fifo_ctx;
1139             AVFilter *fifo;
1140             char name[32];
1141
1142             if (!link->dstpad->needs_fifo)
1143                 continue;
1144
1145             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1146                    avfilter_get_by_name("fifo") :
1147                    avfilter_get_by_name("afifo");
1148
1149             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1150
1151             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1152                                                NULL, graph);
1153             if (ret < 0)
1154                 return ret;
1155
1156             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1157             if (ret < 0)
1158                 return ret;
1159         }
1160     }
1161
1162     return 0;
1163 }
1164
1165 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1166 {
1167     int ret;
1168
1169     if ((ret = graph_check_validity(graphctx, log_ctx)))
1170         return ret;
1171     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1172         return ret;
1173     if ((ret = graph_config_formats(graphctx, log_ctx)))
1174         return ret;
1175     if ((ret = graph_config_links(graphctx, log_ctx)))
1176         return ret;
1177     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1178         return ret;
1179
1180     return 0;
1181 }
1182
1183 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1184 {
1185     int i, r = AVERROR(ENOSYS);
1186
1187     if (!graph)
1188         return r;
1189
1190     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1191         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1192         if (r != AVERROR(ENOSYS))
1193             return r;
1194     }
1195
1196     if (res_len && res)
1197         res[0] = 0;
1198
1199     for (i = 0; i < graph->nb_filters; i++) {
1200         AVFilterContext *filter = graph->filters[i];
1201         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1202             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1203             if (r != AVERROR(ENOSYS)) {
1204                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1205                     return r;
1206             }
1207         }
1208     }
1209
1210     return r;
1211 }
1212
1213 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1214 {
1215     int i;
1216
1217     if(!graph)
1218         return 0;
1219
1220     for (i = 0; i < graph->nb_filters; i++) {
1221         AVFilterContext *filter = graph->filters[i];
1222         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1223             AVFilterCommand **queue = &filter->command_queue, *next;
1224             while (*queue && (*queue)->time <= ts)
1225                 queue = &(*queue)->next;
1226             next = *queue;
1227             *queue = av_mallocz(sizeof(AVFilterCommand));
1228             (*queue)->command = av_strdup(command);
1229             (*queue)->arg     = av_strdup(arg);
1230             (*queue)->time    = ts;
1231             (*queue)->flags   = flags;
1232             (*queue)->next    = next;
1233             if(flags & AVFILTER_CMD_FLAG_ONE)
1234                 return 0;
1235         }
1236     }
1237
1238     return 0;
1239 }
1240
1241 static void heap_bubble_up(AVFilterGraph *graph,
1242                            AVFilterLink *link, int index)
1243 {
1244     AVFilterLink **links = graph->sink_links;
1245
1246     while (index) {
1247         int parent = (index - 1) >> 1;
1248         if (links[parent]->current_pts >= link->current_pts)
1249             break;
1250         links[index] = links[parent];
1251         links[index]->age_index = index;
1252         index = parent;
1253     }
1254     links[index] = link;
1255     link->age_index = index;
1256 }
1257
1258 static void heap_bubble_down(AVFilterGraph *graph,
1259                              AVFilterLink *link, int index)
1260 {
1261     AVFilterLink **links = graph->sink_links;
1262
1263     while (1) {
1264         int child = 2 * index + 1;
1265         if (child >= graph->sink_links_count)
1266             break;
1267         if (child + 1 < graph->sink_links_count &&
1268             links[child + 1]->current_pts < links[child]->current_pts)
1269             child++;
1270         if (link->current_pts < links[child]->current_pts)
1271             break;
1272         links[index] = links[child];
1273         links[index]->age_index = index;
1274         index = child;
1275     }
1276     links[index] = link;
1277     link->age_index = index;
1278 }
1279
1280 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1281 {
1282     heap_bubble_up  (graph, link, link->age_index);
1283     heap_bubble_down(graph, link, link->age_index);
1284 }
1285
1286
1287 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1288 {
1289     while (graph->sink_links_count) {
1290         AVFilterLink *oldest = graph->sink_links[0];
1291         int r = ff_request_frame(oldest);
1292         if (r != AVERROR_EOF)
1293             return r;
1294         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1295                oldest->dst ? oldest->dst->name : "unknown",
1296                oldest->dstpad ? oldest->dstpad->name : "unknown");
1297         /* EOF: remove the link from the heap */
1298         if (oldest->age_index < --graph->sink_links_count)
1299             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1300                              oldest->age_index);
1301         oldest->age_index = -1;
1302     }
1303     return AVERROR_EOF;
1304 }