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

   1 /*
   2  * filter graphs
   3  * Copyright (c) 2008 Vitor Sessak
   4  * Copyright (c) 2007 Bobby Bingham
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include <string.h>
  26
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/avstring.h"
  29 #include "libavutil/bprint.h"
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/internal.h"
  32 #include "libavutil/opt.h"
  33 #include "libavutil/pixdesc.h"
  34
  35 #include "avfilter.h"
  36 #include "formats.h"
  37 #include "internal.h"
  38 #include "thread.h"
  39
  40 #define OFFSET(x) offsetof(AVFilterGraph, x)
  41 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  42 static const AVOption filtergraph_options[] = {
  43     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  44         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
  45         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
  46     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  47         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
  48     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  49         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  50     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  51         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  52     { NULL },
  53 };
  54
  55 static const AVClass filtergraph_class = {
  56     .class_name = "AVFilterGraph",
  57     .item_name  = av_default_item_name,
  58     .version    = LIBAVUTIL_VERSION_INT,
  59     .option     = filtergraph_options,
  60     .category   = AV_CLASS_CATEGORY_FILTER,
  61 };
  62
  63 #if !HAVE_THREADS
  64 void ff_graph_thread_free(AVFilterGraph *graph)
  65 {
  66 }
  67
  68 int ff_graph_thread_init(AVFilterGraph *graph)
  69 {
  70     graph->thread_type = 0;
  71     graph->nb_threads  = 1;
  72     return 0;
  73 }
  74 #endif
  75
  76 AVFilterGraph *avfilter_graph_alloc(void)
  77 {
  78     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  79     if (!ret)
  80         return NULL;
  81
  82     ret->internal = av_mallocz(sizeof(*ret->internal));
  83     if (!ret->internal) {
  84         av_freep(&ret);
  85         return NULL;
  86     }
  87
  88     ret->av_class = &filtergraph_class;
  89     av_opt_set_defaults(ret);
  90
  91     return ret;
  92 }
  93
  94 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
  95 {
  96     int i;
  97     for (i = 0; i < graph->nb_filters; i++) {
  98         if (graph->filters[i] == filter) {
  99             FFSWAP(AVFilterContext*, graph->filters[i],
 100                    graph->filters[graph->nb_filters - 1]);
 101             graph->nb_filters--;
 102             return;
 103         }
 104     }
 105 }
 106
 107 void avfilter_graph_free(AVFilterGraph **graph)
 108 {
 109     if (!*graph)
 110         return;
 111
 112     while ((*graph)->nb_filters)
 113         avfilter_free((*graph)->filters[0]);
 114
 115     ff_graph_thread_free(*graph);
 116
 117     av_freep(&(*graph)->sink_links);
 118
 119     av_freep(&(*graph)->scale_sws_opts);
 120     av_freep(&(*graph)->aresample_swr_opts);
 121     av_freep(&(*graph)->resample_lavr_opts);
 122     av_freep(&(*graph)->filters);
 123     av_freep(&(*graph)->internal);
 124     av_freep(graph);
 125 }
 126
 127 #if FF_API_AVFILTER_OPEN
 128 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 129 {
 130     AVFilterContext **filters = av_realloc(graph->filters,
 131                                            sizeof(*filters) * (graph->nb_filters + 1));
 132     if (!filters)
 133         return AVERROR(ENOMEM);
 134
 135     graph->filters = filters;
 136     graph->filters[graph->nb_filters++] = filter;
 137
 138     filter->graph = graph;
 139
 140     return 0;
 141 }
 142 #endif
 143
 144 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 145                                  const char *name, const char *args, void *opaque,
 146                                  AVFilterGraph *graph_ctx)
 147 {
 148     int ret;
 149
 150     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 151     if (!*filt_ctx)
 152         return AVERROR(ENOMEM);
 153
 154     ret = avfilter_init_str(*filt_ctx, args);
 155     if (ret < 0)
 156         goto fail;
 157
 158     return 0;
 159
 160 fail:
 161     if (*filt_ctx)
 162         avfilter_free(*filt_ctx);
 163     *filt_ctx = NULL;
 164     return ret;
 165 }
 166
 167 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 168 {
 169     graph->disable_auto_convert = flags;
 170 }
 171
 172 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 173                                              const AVFilter *filter,
 174                                              const char *name)
 175 {
 176     AVFilterContext **filters, *s;
 177
 178     if (graph->thread_type && !graph->internal->thread_execute) {
 179         if (graph->execute) {
 180             graph->internal->thread_execute = graph->execute;
 181         } else {
 182             int ret = ff_graph_thread_init(graph);
 183             if (ret < 0) {
 184                 av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
 185                 return NULL;
 186             }
 187         }
 188     }
 189
 190     s = ff_filter_alloc(filter, name);
 191     if (!s)
 192         return NULL;
 193
 194     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 195     if (!filters) {
 196         avfilter_free(s);
 197         return NULL;
 198     }
 199
 200     graph->filters = filters;
 201     graph->filters[graph->nb_filters++] = s;
 202
 203     s->graph = graph;
 204
 205     return s;
 206 }
 207
 208 /**
 209  * Check for the validity of graph.
 210  *
 211  * A graph is considered valid if all its input and output pads are
 212  * connected.
 213  *
 214  * @return >= 0 in case of success, a negative value otherwise
 215  */
 216 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 217 {
 218     AVFilterContext *filt;
 219     int i, j;
 220
 221     for (i = 0; i < graph->nb_filters; i++) {
 222         const AVFilterPad *pad;
 223         filt = graph->filters[i];
 224
 225         for (j = 0; j < filt->nb_inputs; j++) {
 226             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 227                 pad = &filt->input_pads[j];
 228                 av_log(log_ctx, AV_LOG_ERROR,
 229                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 230                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 231                 return AVERROR(EINVAL);
 232             }
 233         }
 234
 235         for (j = 0; j < filt->nb_outputs; j++) {
 236             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 237                 pad = &filt->output_pads[j];
 238                 av_log(log_ctx, AV_LOG_ERROR,
 239                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 240                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 241                 return AVERROR(EINVAL);
 242             }
 243         }
 244     }
 245
 246     return 0;
 247 }
 248
 249 /**
 250  * Configure all the links of graphctx.
 251  *
 252  * @return >= 0 in case of success, a negative value otherwise
 253  */
 254 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 255 {
 256     AVFilterContext *filt;
 257     int i, ret;
 258
 259     for (i = 0; i < graph->nb_filters; i++) {
 260         filt = graph->filters[i];
 261
 262         if (!filt->nb_outputs) {
 263             if ((ret = avfilter_config_links(filt)))
 264                 return ret;
 265         }
 266     }
 267
 268     return 0;
 269 }
 270
 271 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
 272 {
 273     int i;
 274
 275     for (i = 0; i < graph->nb_filters; i++)
 276         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 277             return graph->filters[i];
 278
 279     return NULL;
 280 }
 281
 282 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 283 {
 284     if (!l)
 285         return;
 286     if (l->nb_channel_layouts) {
 287         if (l->all_layouts || l->all_counts)
 288             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 289         l->all_layouts = l->all_counts = 0;
 290     } else {
 291         if (l->all_counts && !l->all_layouts)
 292             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 293         l->all_layouts = 1;
 294     }
 295 }
 296
 297 static int filter_query_formats(AVFilterContext *ctx)
 298 {
 299     int ret, i;
 300     AVFilterFormats *formats;
 301     AVFilterChannelLayouts *chlayouts;
 302     AVFilterFormats *samplerates;
 303     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 304                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 305                             AVMEDIA_TYPE_VIDEO;
 306
 307     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 308         if (ret != AVERROR(EAGAIN))
 309             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 310                    ctx->name, av_err2str(ret));
 311         return ret;
 312     }
 313
 314     for (i = 0; i < ctx->nb_inputs; i++)
 315         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 316     for (i = 0; i < ctx->nb_outputs; i++)
 317         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 318
 319     formats = ff_all_formats(type);
 320     if (!formats)
 321         return AVERROR(ENOMEM);
 322     ff_set_common_formats(ctx, formats);
 323     if (type == AVMEDIA_TYPE_AUDIO) {
 324         samplerates = ff_all_samplerates();
 325         if (!samplerates)
 326             return AVERROR(ENOMEM);
 327         ff_set_common_samplerates(ctx, samplerates);
 328         chlayouts = ff_all_channel_layouts();
 329         if (!chlayouts)
 330             return AVERROR(ENOMEM);
 331         ff_set_common_channel_layouts(ctx, chlayouts);
 332     }
 333     return 0;
 334 }
 335
 336 static int formats_declared(AVFilterContext *f)
 337 {
 338     int i;
 339
 340     for (i = 0; i < f->nb_inputs; i++) {
 341         if (!f->inputs[i]->out_formats)
 342             return 0;
 343         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 344             !(f->inputs[i]->out_samplerates &&
 345               f->inputs[i]->out_channel_layouts))
 346             return 0;
 347     }
 348     for (i = 0; i < f->nb_outputs; i++) {
 349         if (!f->outputs[i]->in_formats)
 350             return 0;
 351         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 352             !(f->outputs[i]->in_samplerates &&
 353               f->outputs[i]->in_channel_layouts))
 354             return 0;
 355     }
 356     return 1;
 357 }
 358
 359 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 360 {
 361     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 362     if (a) {
 363         a->refcount = 0;
 364         a->refs     = NULL;
 365         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 366         if (!a->formats && arg->formats)
 367             av_freep(&a);
 368     }
 369     return a;
 370 }
 371
 372 static int can_merge_formats(AVFilterFormats *a_arg,
 373                              AVFilterFormats *b_arg,
 374                              enum AVMediaType type,
 375                              int is_sample_rate)
 376 {
 377     AVFilterFormats *a, *b, *ret;
 378     if (a_arg == b_arg)
 379         return 1;
 380     a = clone_filter_formats(a_arg);
 381     b = clone_filter_formats(b_arg);
 382
 383     if (!a || !b) {
 384         if (a)
 385             av_freep(&a->formats);
 386         if (b)
 387             av_freep(&b->formats);
 388
 389         av_freep(&a);
 390         av_freep(&b);
 391
 392         return 0;
 393     }
 394
 395     if (is_sample_rate) {
 396         ret = ff_merge_samplerates(a, b);
 397     } else {
 398         ret = ff_merge_formats(a, b, type);
 399     }
 400     if (ret) {
 401         av_freep(&ret->formats);
 402         av_freep(&ret->refs);
 403         av_freep(&ret);
 404         return 1;
 405     } else {
 406         av_freep(&a->formats);
 407         av_freep(&b->formats);
 408         av_freep(&a);
 409         av_freep(&b);
 410         return 0;
 411     }
 412 }
 413
 414 /**
 415  * Perform one round of query_formats() and merging formats lists on the
 416  * filter graph.
 417  * @return  >=0 if all links formats lists could be queried and merged;
 418  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 419  *          and a later call may succeed;
 420  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 421  *          was made and the negotiation is stuck;
 422  *          a negative error code if some other error happened
 423  */
 424 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 425 {
 426     int i, j, ret;
 427     int scaler_count = 0, resampler_count = 0;
 428     int count_queried = 0;        /* successful calls to query_formats() */
 429     int count_merged = 0;         /* successful merge of formats lists */
 430     int count_already_merged = 0; /* lists already merged */
 431     int count_delayed = 0;        /* lists that need to be merged later */
 432
 433     for (i = 0; i < graph->nb_filters; i++) {
 434         AVFilterContext *f = graph->filters[i];
 435         if (formats_declared(f))
 436             continue;
 437         if (f->filter->query_formats)
 438             ret = filter_query_formats(f);
 439         else
 440             ret = ff_default_query_formats(f);
 441         if (ret < 0 && ret != AVERROR(EAGAIN))
 442             return ret;
 443         /* note: EAGAIN could indicate a partial success, not counted yet */
 444         count_queried += ret >= 0;
 445     }
 446
 447     /* go through and merge as many format lists as possible */
 448     for (i = 0; i < graph->nb_filters; i++) {
 449         AVFilterContext *filter = graph->filters[i];
 450
 451         for (j = 0; j < filter->nb_inputs; j++) {
 452             AVFilterLink *link = filter->inputs[j];
 453             int convert_needed = 0;
 454
 455             if (!link)
 456                 continue;
 457
 458             if (link->in_formats != link->out_formats
 459                 && link->in_formats && link->out_formats)
 460                 if (!can_merge_formats(link->in_formats, link->out_formats,
 461                                       link->type, 0))
 462                     convert_needed = 1;
 463             if (link->type == AVMEDIA_TYPE_AUDIO) {
 464                 if (link->in_samplerates != link->out_samplerates
 465                     && link->in_samplerates && link->out_samplerates)
 466                     if (!can_merge_formats(link->in_samplerates,
 467                                            link->out_samplerates,
 468                                            0, 1))
 469                         convert_needed = 1;
 470             }
 471
 472 #define MERGE_DISPATCH(field, statement)                                     \
 473             if (!(link->in_ ## field && link->out_ ## field)) {              \
 474                 count_delayed++;                                             \
 475             } else if (link->in_ ## field == link->out_ ## field) {          \
 476                 count_already_merged++;                                      \
 477             } else if (!convert_needed) {                                    \
 478                 count_merged++;                                              \
 479                 statement                                                    \
 480             }
 481
 482             if (link->type == AVMEDIA_TYPE_AUDIO) {
 483                 MERGE_DISPATCH(channel_layouts,
 484                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 485                                                   link->out_channel_layouts))
 486                         convert_needed = 1;
 487                 )
 488                 MERGE_DISPATCH(samplerates,
 489                     if (!ff_merge_samplerates(link->in_samplerates,
 490                                               link->out_samplerates))
 491                         convert_needed = 1;
 492                 )
 493             }
 494             MERGE_DISPATCH(formats,
 495                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 496                                       link->type))
 497                     convert_needed = 1;
 498             )
 499 #undef MERGE_DISPATCH
 500
 501             if (convert_needed) {
 502                 AVFilterContext *convert;
 503                 AVFilter *filter;
 504                 AVFilterLink *inlink, *outlink;
 505                 char scale_args[256];
 506                 char inst_name[30];
 507
 508                 /* couldn't merge format lists. auto-insert conversion filter */
 509                 switch (link->type) {
 510                 case AVMEDIA_TYPE_VIDEO:
 511                     if (!(filter = avfilter_get_by_name("scale"))) {
 512                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 513                                "not present, cannot convert pixel formats.\n");
 514                         return AVERROR(EINVAL);
 515                     }
 516
 517                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 518                              scaler_count++);
 519
 520                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 521                                                             inst_name, graph->scale_sws_opts, NULL,
 522                                                             graph)) < 0)
 523                         return ret;
 524                     break;
 525                 case AVMEDIA_TYPE_AUDIO:
 526                     if (!(filter = avfilter_get_by_name("aresample"))) {
 527                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 528                                "not present, cannot convert audio formats.\n");
 529                         return AVERROR(EINVAL);
 530                     }
 531
 532                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 533                              resampler_count++);
 534                     scale_args[0] = '\0';
 535                     if (graph->aresample_swr_opts)
 536                         snprintf(scale_args, sizeof(scale_args), "%s",
 537                                  graph->aresample_swr_opts);
 538                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 539                                                             inst_name, graph->aresample_swr_opts,
 540                                                             NULL, graph)) < 0)
 541                         return ret;
 542                     break;
 543                 default:
 544                     return AVERROR(EINVAL);
 545                 }
 546
 547                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 548                     return ret;
 549
 550                 if ((ret = filter_query_formats(convert)) < 0)
 551                     return ret;
 552
 553                 inlink  = convert->inputs[0];
 554                 outlink = convert->outputs[0];
 555                 av_assert0( inlink-> in_formats->refcount > 0);
 556                 av_assert0( inlink->out_formats->refcount > 0);
 557                 av_assert0(outlink-> in_formats->refcount > 0);
 558                 av_assert0(outlink->out_formats->refcount > 0);
 559                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 560                     av_assert0( inlink-> in_samplerates->refcount > 0);
 561                     av_assert0( inlink->out_samplerates->refcount > 0);
 562                     av_assert0(outlink-> in_samplerates->refcount > 0);
 563                     av_assert0(outlink->out_samplerates->refcount > 0);
 564                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
 565                     av_assert0( inlink->out_channel_layouts->refcount > 0);
 566                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
 567                     av_assert0(outlink->out_channel_layouts->refcount > 0);
 568                 }
 569                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 570                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 571                     ret = AVERROR(ENOSYS);
 572                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 573                     (!ff_merge_samplerates(inlink->in_samplerates,
 574                                            inlink->out_samplerates) ||
 575                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 576                                                inlink->out_channel_layouts)))
 577                     ret = AVERROR(ENOSYS);
 578                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 579                     (!ff_merge_samplerates(outlink->in_samplerates,
 580                                            outlink->out_samplerates) ||
 581                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 582                                                outlink->out_channel_layouts)))
 583                     ret = AVERROR(ENOSYS);
 584
 585                 if (ret < 0) {
 586                     av_log(log_ctx, AV_LOG_ERROR,
 587                            "Impossible to convert between the formats supported by the filter "
 588                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 589                     return ret;
 590                 }
 591             }
 592         }
 593     }
 594
 595     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 596            "%d queried, %d merged, %d already done, %d delayed\n",
 597            count_queried, count_merged, count_already_merged, count_delayed);
 598     if (count_delayed) {
 599         AVBPrint bp;
 600
 601         /* if count_queried > 0, one filter at least did set its formats,
 602            that will give additional information to its neighbour;
 603            if count_merged > 0, one pair of formats lists at least was merged,
 604            that will give additional information to all connected filters;
 605            in both cases, progress was made and a new round must be done */
 606         if (count_queried || count_merged)
 607             return AVERROR(EAGAIN);
 608         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 609         for (i = 0; i < graph->nb_filters; i++)
 610             if (!formats_declared(graph->filters[i]))
 611                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 612                           graph->filters[i]->name);
 613         av_log(graph, AV_LOG_ERROR,
 614                "The following filters could not choose their formats: %s\n"
 615                "Consider inserting the (a)format filter near their input or "
 616                "output.\n", bp.str);
 617         return AVERROR(EIO);
 618     }
 619     return 0;
 620 }
 621
 622 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 623 {
 624     int score = 0;
 625
 626     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 627         score ++;
 628
 629     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 630         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 631     }else
 632         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 633
 634     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 635         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 636         score += 20;
 637
 638     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 639         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 640         score += 2;
 641
 642     return score;
 643 }
 644
 645 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 646                                                      enum AVSampleFormat src_fmt)
 647 {
 648     int score1, score2;
 649
 650     score1 = get_fmt_score(dst_fmt1, src_fmt);
 651     score2 = get_fmt_score(dst_fmt2, src_fmt);
 652
 653     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 654 }
 655
 656 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 657 {
 658     if (!link || !link->in_formats)
 659         return 0;
 660
 661     if (link->type == AVMEDIA_TYPE_VIDEO) {
 662         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 663             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 664             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 665             int i;
 666             for (i=0; i<link->in_formats->nb_formats; i++) {
 667                 enum AVPixelFormat p = link->in_formats->formats[i];
 668                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 669             }
 670             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 671                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 672                    av_get_pix_fmt_name(ref->format), has_alpha);
 673             link->in_formats->formats[0] = best;
 674         }
 675     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 676         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 677             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 678             int i;
 679             for (i=0; i<link->in_formats->nb_formats; i++) {
 680                 enum AVSampleFormat p = link->in_formats->formats[i];
 681                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 682             }
 683             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 684                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
 685                    av_get_sample_fmt_name(ref->format));
 686             link->in_formats->formats[0] = best;
 687         }
 688     }
 689
 690     link->in_formats->nb_formats = 1;
 691     link->format = link->in_formats->formats[0];
 692
 693     if (link->type == AVMEDIA_TYPE_AUDIO) {
 694         if (!link->in_samplerates->nb_formats) {
 695             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 696                    " the link between filters %s and %s.\n", link->src->name,
 697                    link->dst->name);
 698             return AVERROR(EINVAL);
 699         }
 700         link->in_samplerates->nb_formats = 1;
 701         link->sample_rate = link->in_samplerates->formats[0];
 702
 703         if (link->in_channel_layouts->all_layouts) {
 704             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 705                    " the link between filters %s and %s.\n", link->src->name,
 706                    link->dst->name);
 707             if (!link->in_channel_layouts->all_counts)
 708                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 709                        "supported, try specifying a channel layout using "
 710                        "'aformat=channel_layouts=something'.\n");
 711             return AVERROR(EINVAL);
 712         }
 713         link->in_channel_layouts->nb_channel_layouts = 1;
 714         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 715         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 716             link->channel_layout = 0;
 717         else
 718             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 719     }
 720
 721     ff_formats_unref(&link->in_formats);
 722     ff_formats_unref(&link->out_formats);
 723     ff_formats_unref(&link->in_samplerates);
 724     ff_formats_unref(&link->out_samplerates);
 725     ff_channel_layouts_unref(&link->in_channel_layouts);
 726     ff_channel_layouts_unref(&link->out_channel_layouts);
 727
 728     return 0;
 729 }
 730
 731 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 732 do {                                                                   \
 733     for (i = 0; i < filter->nb_inputs; i++) {                          \
 734         AVFilterLink *link = filter->inputs[i];                        \
 735         fmt_type fmt;                                                  \
 736                                                                        \
 737         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 738             continue;                                                  \
 739         fmt = link->out_ ## list->var[0];                              \
 740                                                                        \
 741         for (j = 0; j < filter->nb_outputs; j++) {                     \
 742             AVFilterLink *out_link = filter->outputs[j];               \
 743             list_type *fmts;                                           \
 744                                                                        \
 745             if (link->type != out_link->type ||                        \
 746                 out_link->in_ ## list->nb == 1)                        \
 747                 continue;                                              \
 748             fmts = out_link->in_ ## list;                              \
 749                                                                        \
 750             if (!out_link->in_ ## list->nb) {                          \
 751                 add_format(&out_link->in_ ##list, fmt);                \
 752                 ret = 1;                                               \
 753                 break;                                                 \
 754             }                                                          \
 755                                                                        \
 756             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 757                 if (fmts->var[k] == fmt) {                             \
 758                     fmts->var[0]  = fmt;                               \
 759                     fmts->nb = 1;                                      \
 760                     ret = 1;                                           \
 761                     break;                                             \
 762                 }                                                      \
 763         }                                                              \
 764     }                                                                  \
 765 } while (0)
 766
 767 static int reduce_formats_on_filter(AVFilterContext *filter)
 768 {
 769     int i, j, k, ret = 0;
 770
 771     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 772                    nb_formats, ff_add_format);
 773     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 774                    nb_formats, ff_add_format);
 775
 776     /* reduce channel layouts */
 777     for (i = 0; i < filter->nb_inputs; i++) {
 778         AVFilterLink *inlink = filter->inputs[i];
 779         uint64_t fmt;
 780
 781         if (!inlink->out_channel_layouts ||
 782             inlink->out_channel_layouts->nb_channel_layouts != 1)
 783             continue;
 784         fmt = inlink->out_channel_layouts->channel_layouts[0];
 785
 786         for (j = 0; j < filter->nb_outputs; j++) {
 787             AVFilterLink *outlink = filter->outputs[j];
 788             AVFilterChannelLayouts *fmts;
 789
 790             fmts = outlink->in_channel_layouts;
 791             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 792                 continue;
 793
 794             if (fmts->all_layouts &&
 795                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 796                 /* Turn the infinite list into a singleton */
 797                 fmts->all_layouts = fmts->all_counts  = 0;
 798                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 799                 break;
 800             }
 801
 802             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 803                 if (fmts->channel_layouts[k] == fmt) {
 804                     fmts->channel_layouts[0]  = fmt;
 805                     fmts->nb_channel_layouts = 1;
 806                     ret = 1;
 807                     break;
 808                 }
 809             }
 810         }
 811     }
 812
 813     return ret;
 814 }
 815
 816 static void reduce_formats(AVFilterGraph *graph)
 817 {
 818     int i, reduced;
 819
 820     do {
 821         reduced = 0;
 822
 823         for (i = 0; i < graph->nb_filters; i++)
 824             reduced |= reduce_formats_on_filter(graph->filters[i]);
 825     } while (reduced);
 826 }
 827
 828 static void swap_samplerates_on_filter(AVFilterContext *filter)
 829 {
 830     AVFilterLink *link = NULL;
 831     int sample_rate;
 832     int i, j;
 833
 834     for (i = 0; i < filter->nb_inputs; i++) {
 835         link = filter->inputs[i];
 836
 837         if (link->type == AVMEDIA_TYPE_AUDIO &&
 838             link->out_samplerates->nb_formats== 1)
 839             break;
 840     }
 841     if (i == filter->nb_inputs)
 842         return;
 843
 844     sample_rate = link->out_samplerates->formats[0];
 845
 846     for (i = 0; i < filter->nb_outputs; i++) {
 847         AVFilterLink *outlink = filter->outputs[i];
 848         int best_idx, best_diff = INT_MAX;
 849
 850         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 851             outlink->in_samplerates->nb_formats < 2)
 852             continue;
 853
 854         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 855             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 856
 857             if (diff < best_diff) {
 858                 best_diff = diff;
 859                 best_idx  = j;
 860             }
 861         }
 862         FFSWAP(int, outlink->in_samplerates->formats[0],
 863                outlink->in_samplerates->formats[best_idx]);
 864     }
 865 }
 866
 867 static void swap_samplerates(AVFilterGraph *graph)
 868 {
 869     int i;
 870
 871     for (i = 0; i < graph->nb_filters; i++)
 872         swap_samplerates_on_filter(graph->filters[i]);
 873 }
 874
 875 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 876 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 877 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 878 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 879 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 880 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 881 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 882
 883 /* allowable substitutions for channel pairs when comparing layouts,
 884  * ordered by priority for both values */
 885 static const uint64_t ch_subst[][2] = {
 886     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 887     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 888     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 889     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 890     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 891     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 892     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 893     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 894     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 895     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 896     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 897     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 898     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 899     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 900     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 901     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 902     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 903     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 904     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 905     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 906     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 907 };
 908
 909 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 910 {
 911     AVFilterLink *link = NULL;
 912     int i, j, k;
 913
 914     for (i = 0; i < filter->nb_inputs; i++) {
 915         link = filter->inputs[i];
 916
 917         if (link->type == AVMEDIA_TYPE_AUDIO &&
 918             link->out_channel_layouts->nb_channel_layouts == 1)
 919             break;
 920     }
 921     if (i == filter->nb_inputs)
 922         return;
 923
 924     for (i = 0; i < filter->nb_outputs; i++) {
 925         AVFilterLink *outlink = filter->outputs[i];
 926         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 927
 928         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 929             outlink->in_channel_layouts->nb_channel_layouts < 2)
 930             continue;
 931
 932         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 933             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 934             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 935             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 936             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 937             int count_diff        = out_channels - in_channels;
 938             int matched_channels, extra_channels;
 939             int score = 100000;
 940
 941             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 942                 /* Compute score in case the input or output layout encodes
 943                    a channel count; in this case the score is not altered by
 944                    the computation afterwards, as in_chlayout and
 945                    out_chlayout have both been set to 0 */
 946                 if (FF_LAYOUT2COUNT(in_chlayout))
 947                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 948                 if (FF_LAYOUT2COUNT(out_chlayout))
 949                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 950                 score -= 10000 + FFABS(out_channels - in_channels) +
 951                          (in_channels > out_channels ? 10000 : 0);
 952                 in_chlayout = out_chlayout = 0;
 953                 /* Let the remaining computation run, even if the score
 954                    value is not altered */
 955             }
 956
 957             /* channel substitution */
 958             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 959                 uint64_t cmp0 = ch_subst[k][0];
 960                 uint64_t cmp1 = ch_subst[k][1];
 961                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 962                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 963                     in_chlayout  &= ~cmp0;
 964                     out_chlayout &= ~cmp1;
 965                     /* add score for channel match, minus a deduction for
 966                        having to do the substitution */
 967                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 968                 }
 969             }
 970
 971             /* no penalty for LFE channel mismatch */
 972             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 973                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 974                 score += 10;
 975             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 976             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 977
 978             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 979                                                                  out_chlayout);
 980             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 981                                                                  (~in_chlayout));
 982             score += 10 * matched_channels - 5 * extra_channels;
 983
 984             if (score > best_score ||
 985                 (count_diff < best_count_diff && score == best_score)) {
 986                 best_score = score;
 987                 best_idx   = j;
 988                 best_count_diff = count_diff;
 989             }
 990         }
 991         av_assert0(best_idx >= 0);
 992         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 993                outlink->in_channel_layouts->channel_layouts[best_idx]);
 994     }
 995
 996 }
 997
 998 static void swap_channel_layouts(AVFilterGraph *graph)
 999 {
1000     int i;
1001
1002     for (i = 0; i < graph->nb_filters; i++)
1003         swap_channel_layouts_on_filter(graph->filters[i]);
1004 }
1005
1006 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1007 {
1008     AVFilterLink *link = NULL;
1009     int format, bps;
1010     int i, j;
1011
1012     for (i = 0; i < filter->nb_inputs; i++) {
1013         link = filter->inputs[i];
1014
1015         if (link->type == AVMEDIA_TYPE_AUDIO &&
1016             link->out_formats->nb_formats == 1)
1017             break;
1018     }
1019     if (i == filter->nb_inputs)
1020         return;
1021
1022     format = link->out_formats->formats[0];
1023     bps    = av_get_bytes_per_sample(format);
1024
1025     for (i = 0; i < filter->nb_outputs; i++) {
1026         AVFilterLink *outlink = filter->outputs[i];
1027         int best_idx = -1, best_score = INT_MIN;
1028
1029         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1030             outlink->in_formats->nb_formats < 2)
1031             continue;
1032
1033         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1034             int out_format = outlink->in_formats->formats[j];
1035             int out_bps    = av_get_bytes_per_sample(out_format);
1036             int score;
1037
1038             if (av_get_packed_sample_fmt(out_format) == format ||
1039                 av_get_planar_sample_fmt(out_format) == format) {
1040                 best_idx   = j;
1041                 break;
1042             }
1043
1044             /* for s32 and float prefer double to prevent loss of information */
1045             if (bps == 4 && out_bps == 8) {
1046                 best_idx = j;
1047                 break;
1048             }
1049
1050             /* prefer closest higher or equal bps */
1051             score = -abs(out_bps - bps);
1052             if (out_bps >= bps)
1053                 score += INT_MAX/2;
1054
1055             if (score > best_score) {
1056                 best_score = score;
1057                 best_idx   = j;
1058             }
1059         }
1060         av_assert0(best_idx >= 0);
1061         FFSWAP(int, outlink->in_formats->formats[0],
1062                outlink->in_formats->formats[best_idx]);
1063     }
1064 }
1065
1066 static void swap_sample_fmts(AVFilterGraph *graph)
1067 {
1068     int i;
1069
1070     for (i = 0; i < graph->nb_filters; i++)
1071         swap_sample_fmts_on_filter(graph->filters[i]);
1072
1073 }
1074
1075 static int pick_formats(AVFilterGraph *graph)
1076 {
1077     int i, j, ret;
1078     int change;
1079
1080     do{
1081         change = 0;
1082         for (i = 0; i < graph->nb_filters; i++) {
1083             AVFilterContext *filter = graph->filters[i];
1084             if (filter->nb_inputs){
1085                 for (j = 0; j < filter->nb_inputs; j++){
1086                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1087                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1088                             return ret;
1089                         change = 1;
1090                     }
1091                 }
1092             }
1093             if (filter->nb_outputs){
1094                 for (j = 0; j < filter->nb_outputs; j++){
1095                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1096                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1097                             return ret;
1098                         change = 1;
1099                     }
1100                 }
1101             }
1102             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1103                 for (j = 0; j < filter->nb_outputs; j++) {
1104                     if(filter->outputs[j]->format<0) {
1105                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1106                             return ret;
1107                         change = 1;
1108                     }
1109                 }
1110             }
1111         }
1112     }while(change);
1113
1114     for (i = 0; i < graph->nb_filters; i++) {
1115         AVFilterContext *filter = graph->filters[i];
1116
1117         for (j = 0; j < filter->nb_inputs; j++)
1118             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1119                 return ret;
1120         for (j = 0; j < filter->nb_outputs; j++)
1121             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1122                 return ret;
1123     }
1124     return 0;
1125 }
1126
1127 /**
1128  * Configure the formats of all the links in the graph.
1129  */
1130 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1131 {
1132     int ret;
1133
1134     /* find supported formats from sub-filters, and merge along links */
1135     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1136         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1137     if (ret < 0)
1138         return ret;
1139
1140     /* Once everything is merged, it's possible that we'll still have
1141      * multiple valid media format choices. We try to minimize the amount
1142      * of format conversion inside filters */
1143     reduce_formats(graph);
1144
1145     /* for audio filters, ensure the best format, sample rate and channel layout
1146      * is selected */
1147     swap_sample_fmts(graph);
1148     swap_samplerates(graph);
1149     swap_channel_layouts(graph);
1150
1151     if ((ret = pick_formats(graph)) < 0)
1152         return ret;
1153
1154     return 0;
1155 }
1156
1157 static int graph_config_pointers(AVFilterGraph *graph,
1158                                              AVClass *log_ctx)
1159 {
1160     unsigned i, j;
1161     int sink_links_count = 0, n = 0;
1162     AVFilterContext *f;
1163     AVFilterLink **sinks;
1164
1165     for (i = 0; i < graph->nb_filters; i++) {
1166         f = graph->filters[i];
1167         for (j = 0; j < f->nb_inputs; j++) {
1168             f->inputs[j]->graph     = graph;
1169             f->inputs[j]->age_index = -1;
1170         }
1171         for (j = 0; j < f->nb_outputs; j++) {
1172             f->outputs[j]->graph    = graph;
1173             f->outputs[j]->age_index= -1;
1174         }
1175         if (!f->nb_outputs) {
1176             if (f->nb_inputs > INT_MAX - sink_links_count)
1177                 return AVERROR(EINVAL);
1178             sink_links_count += f->nb_inputs;
1179         }
1180     }
1181     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1182     if (!sinks)
1183         return AVERROR(ENOMEM);
1184     for (i = 0; i < graph->nb_filters; i++) {
1185         f = graph->filters[i];
1186         if (!f->nb_outputs) {
1187             for (j = 0; j < f->nb_inputs; j++) {
1188                 sinks[n] = f->inputs[j];
1189                 f->inputs[j]->age_index = n++;
1190             }
1191         }
1192     }
1193     av_assert0(n == sink_links_count);
1194     graph->sink_links       = sinks;
1195     graph->sink_links_count = sink_links_count;
1196     return 0;
1197 }
1198
1199 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1200 {
1201     AVFilterContext *f;
1202     int i, j, ret;
1203     int fifo_count = 0;
1204
1205     for (i = 0; i < graph->nb_filters; i++) {
1206         f = graph->filters[i];
1207
1208         for (j = 0; j < f->nb_inputs; j++) {
1209             AVFilterLink *link = f->inputs[j];
1210             AVFilterContext *fifo_ctx;
1211             AVFilter *fifo;
1212             char name[32];
1213
1214             if (!link->dstpad->needs_fifo)
1215                 continue;
1216
1217             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1218                    avfilter_get_by_name("fifo") :
1219                    avfilter_get_by_name("afifo");
1220
1221             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1222
1223             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1224                                                NULL, graph);
1225             if (ret < 0)
1226                 return ret;
1227
1228             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1229             if (ret < 0)
1230                 return ret;
1231         }
1232     }
1233
1234     return 0;
1235 }
1236
1237 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1238 {
1239     int ret;
1240
1241     if ((ret = graph_check_validity(graphctx, log_ctx)))
1242         return ret;
1243     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1244         return ret;
1245     if ((ret = graph_config_formats(graphctx, log_ctx)))
1246         return ret;
1247     if ((ret = graph_config_links(graphctx, log_ctx)))
1248         return ret;
1249     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1250         return ret;
1251
1252     return 0;
1253 }
1254
1255 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1256 {
1257     int i, r = AVERROR(ENOSYS);
1258
1259     if (!graph)
1260         return r;
1261
1262     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1263         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1264         if (r != AVERROR(ENOSYS))
1265             return r;
1266     }
1267
1268     if (res_len && res)
1269         res[0] = 0;
1270
1271     for (i = 0; i < graph->nb_filters; i++) {
1272         AVFilterContext *filter = graph->filters[i];
1273         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1274             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1275             if (r != AVERROR(ENOSYS)) {
1276                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1277                     return r;
1278             }
1279         }
1280     }
1281
1282     return r;
1283 }
1284
1285 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1286 {
1287     int i;
1288
1289     if(!graph)
1290         return 0;
1291
1292     for (i = 0; i < graph->nb_filters; i++) {
1293         AVFilterContext *filter = graph->filters[i];
1294         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1295             AVFilterCommand **queue = &filter->command_queue, *next;
1296             while (*queue && (*queue)->time <= ts)
1297                 queue = &(*queue)->next;
1298             next = *queue;
1299             *queue = av_mallocz(sizeof(AVFilterCommand));
1300             (*queue)->command = av_strdup(command);
1301             (*queue)->arg     = av_strdup(arg);
1302             (*queue)->time    = ts;
1303             (*queue)->flags   = flags;
1304             (*queue)->next    = next;
1305             if(flags & AVFILTER_CMD_FLAG_ONE)
1306                 return 0;
1307         }
1308     }
1309
1310     return 0;
1311 }
1312
1313 static void heap_bubble_up(AVFilterGraph *graph,
1314                            AVFilterLink *link, int index)
1315 {
1316     AVFilterLink **links = graph->sink_links;
1317
1318     av_assert0(index >= 0);
1319
1320     while (index) {
1321         int parent = (index - 1) >> 1;
1322         if (links[parent]->current_pts >= link->current_pts)
1323             break;
1324         links[index] = links[parent];
1325         links[index]->age_index = index;
1326         index = parent;
1327     }
1328     links[index] = link;
1329     link->age_index = index;
1330 }
1331
1332 static void heap_bubble_down(AVFilterGraph *graph,
1333                              AVFilterLink *link, int index)
1334 {
1335     AVFilterLink **links = graph->sink_links;
1336
1337     av_assert0(index >= 0);
1338
1339     while (1) {
1340         int child = 2 * index + 1;
1341         if (child >= graph->sink_links_count)
1342             break;
1343         if (child + 1 < graph->sink_links_count &&
1344             links[child + 1]->current_pts < links[child]->current_pts)
1345             child++;
1346         if (link->current_pts < links[child]->current_pts)
1347             break;
1348         links[index] = links[child];
1349         links[index]->age_index = index;
1350         index = child;
1351     }
1352     links[index] = link;
1353     link->age_index = index;
1354 }
1355
1356 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1357 {
1358     heap_bubble_up  (graph, link, link->age_index);
1359     heap_bubble_down(graph, link, link->age_index);
1360 }
1361
1362
1363 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1364 {
1365     while (graph->sink_links_count) {
1366         AVFilterLink *oldest = graph->sink_links[0];
1367         int r = ff_request_frame(oldest);
1368         if (r != AVERROR_EOF)
1369             return r;
1370         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1371                oldest->dst ? oldest->dst->name : "unknown",
1372                oldest->dstpad ? oldest->dstpad->name : "unknown");
1373         /* EOF: remove the link from the heap */
1374         if (oldest->age_index < --graph->sink_links_count)
1375             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1376                              oldest->age_index);
1377         oldest->age_index = -1;
1378     }
1379     return AVERROR_EOF;
1380 }