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

   1 /*
   2  * filter graphs
   3  * Copyright (c) 2008 Vitor Sessak
   4  * Copyright (c) 2007 Bobby Bingham
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include <string.h>
  26
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/avstring.h"
  29 #include "libavutil/bprint.h"
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/imgutils.h"
  32 #include "libavutil/internal.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/pixdesc.h"
  35
  36 #define FF_INTERNAL_FIELDS 1
  37 #include "framequeue.h"
  38
  39 #include "avfilter.h"
  40 #include "buffersink.h"
  41 #include "formats.h"
  42 #include "internal.h"
  43 #include "thread.h"
  44
  45 #define OFFSET(x) offsetof(AVFilterGraph, x)
  46 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  47 static const AVOption filtergraph_options[] = {
  48     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
  49         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
  50         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
  51     { "threads",     "Maximum number of threads", OFFSET(nb_threads),
  52         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
  53     {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
  54         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  55     {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
  56         AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
  57     { NULL },
  58 };
  59
  60 static const AVClass filtergraph_class = {
  61     .class_name = "AVFilterGraph",
  62     .item_name  = av_default_item_name,
  63     .version    = LIBAVUTIL_VERSION_INT,
  64     .option     = filtergraph_options,
  65     .category   = AV_CLASS_CATEGORY_FILTER,
  66 };
  67
  68 #if !HAVE_THREADS
  69 void ff_graph_thread_free(AVFilterGraph *graph)
  70 {
  71 }
  72
  73 int ff_graph_thread_init(AVFilterGraph *graph)
  74 {
  75     graph->thread_type = 0;
  76     graph->nb_threads  = 1;
  77     return 0;
  78 }
  79 #endif
  80
  81 AVFilterGraph *avfilter_graph_alloc(void)
  82 {
  83     AVFilterGraph *ret = av_mallocz(sizeof(*ret));
  84     if (!ret)
  85         return NULL;
  86
  87     ret->internal = av_mallocz(sizeof(*ret->internal));
  88     if (!ret->internal) {
  89         av_freep(&ret);
  90         return NULL;
  91     }
  92
  93     ret->av_class = &filtergraph_class;
  94     av_opt_set_defaults(ret);
  95     ff_framequeue_global_init(&ret->internal->frame_queues);
  96
  97     return ret;
  98 }
  99
 100 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
 101 {
 102     int i, j;
 103     for (i = 0; i < graph->nb_filters; i++) {
 104         if (graph->filters[i] == filter) {
 105             FFSWAP(AVFilterContext*, graph->filters[i],
 106                    graph->filters[graph->nb_filters - 1]);
 107             graph->nb_filters--;
 108             filter->graph = NULL;
 109             for (j = 0; j<filter->nb_outputs; j++)
 110                 if (filter->outputs[j])
 111                     filter->outputs[j]->graph = NULL;
 112
 113             return;
 114         }
 115     }
 116 }
 117
 118 void avfilter_graph_free(AVFilterGraph **graph)
 119 {
 120     if (!*graph)
 121         return;
 122
 123     while ((*graph)->nb_filters)
 124         avfilter_free((*graph)->filters[0]);
 125
 126     ff_graph_thread_free(*graph);
 127
 128     av_freep(&(*graph)->sink_links);
 129
 130     av_freep(&(*graph)->scale_sws_opts);
 131     av_freep(&(*graph)->aresample_swr_opts);
 132 #if FF_API_LAVR_OPTS
 133     av_freep(&(*graph)->resample_lavr_opts);
 134 #endif
 135     av_freep(&(*graph)->filters);
 136     av_freep(&(*graph)->internal);
 137     av_freep(graph);
 138 }
 139
 140 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
 141                                  const char *name, const char *args, void *opaque,
 142                                  AVFilterGraph *graph_ctx)
 143 {
 144     int ret;
 145
 146     *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
 147     if (!*filt_ctx)
 148         return AVERROR(ENOMEM);
 149
 150     ret = avfilter_init_str(*filt_ctx, args);
 151     if (ret < 0)
 152         goto fail;
 153
 154     return 0;
 155
 156 fail:
 157     if (*filt_ctx)
 158         avfilter_free(*filt_ctx);
 159     *filt_ctx = NULL;
 160     return ret;
 161 }
 162
 163 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 164 {
 165     graph->disable_auto_convert = flags;
 166 }
 167
 168 AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
 169                                              const AVFilter *filter,
 170                                              const char *name)
 171 {
 172     AVFilterContext **filters, *s;
 173
 174     if (graph->thread_type && !graph->internal->thread_execute) {
 175         if (graph->execute) {
 176             graph->internal->thread_execute = graph->execute;
 177         } else {
 178             int ret = ff_graph_thread_init(graph);
 179             if (ret < 0) {
 180                 av_log(graph, AV_LOG_ERROR, "Error initializing threading: %s.\n", av_err2str(ret));
 181                 return NULL;
 182             }
 183         }
 184     }
 185
 186     s = ff_filter_alloc(filter, name);
 187     if (!s)
 188         return NULL;
 189
 190     filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
 191     if (!filters) {
 192         avfilter_free(s);
 193         return NULL;
 194     }
 195
 196     graph->filters = filters;
 197     graph->filters[graph->nb_filters++] = s;
 198
 199     s->graph = graph;
 200
 201     return s;
 202 }
 203
 204 /**
 205  * Check for the validity of graph.
 206  *
 207  * A graph is considered valid if all its input and output pads are
 208  * connected.
 209  *
 210  * @return >= 0 in case of success, a negative value otherwise
 211  */
 212 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 213 {
 214     AVFilterContext *filt;
 215     int i, j;
 216
 217     for (i = 0; i < graph->nb_filters; i++) {
 218         const AVFilterPad *pad;
 219         filt = graph->filters[i];
 220
 221         for (j = 0; j < filt->nb_inputs; j++) {
 222             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 223                 pad = &filt->input_pads[j];
 224                 av_log(log_ctx, AV_LOG_ERROR,
 225                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 226                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 227                 return AVERROR(EINVAL);
 228             }
 229         }
 230
 231         for (j = 0; j < filt->nb_outputs; j++) {
 232             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 233                 pad = &filt->output_pads[j];
 234                 av_log(log_ctx, AV_LOG_ERROR,
 235                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 236                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 237                 return AVERROR(EINVAL);
 238             }
 239         }
 240     }
 241
 242     return 0;
 243 }
 244
 245 /**
 246  * Configure all the links of graphctx.
 247  *
 248  * @return >= 0 in case of success, a negative value otherwise
 249  */
 250 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 251 {
 252     AVFilterContext *filt;
 253     int i, ret;
 254
 255     for (i = 0; i < graph->nb_filters; i++) {
 256         filt = graph->filters[i];
 257
 258         if (!filt->nb_outputs) {
 259             if ((ret = avfilter_config_links(filt)))
 260                 return ret;
 261         }
 262     }
 263
 264     return 0;
 265 }
 266
 267 static int graph_check_links(AVFilterGraph *graph, AVClass *log_ctx)
 268 {
 269     AVFilterContext *f;
 270     AVFilterLink *l;
 271     unsigned i, j;
 272     int ret;
 273
 274     for (i = 0; i < graph->nb_filters; i++) {
 275         f = graph->filters[i];
 276         for (j = 0; j < f->nb_outputs; j++) {
 277             l = f->outputs[j];
 278             if (l->type == AVMEDIA_TYPE_VIDEO) {
 279                 ret = av_image_check_size2(l->w, l->h, INT64_MAX, l->format, 0, f);
 280                 if (ret < 0)
 281                     return ret;
 282             }
 283         }
 284     }
 285     return 0;
 286 }
 287
 288 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, const char *name)
 289 {
 290     int i;
 291
 292     for (i = 0; i < graph->nb_filters; i++)
 293         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 294             return graph->filters[i];
 295
 296     return NULL;
 297 }
 298
 299 static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 300 {
 301     if (!l)
 302         return;
 303     if (l->nb_channel_layouts) {
 304         if (l->all_layouts || l->all_counts)
 305             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 306         l->all_layouts = l->all_counts = 0;
 307     } else {
 308         if (l->all_counts && !l->all_layouts)
 309             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 310         l->all_layouts = 1;
 311     }
 312 }
 313
 314 static int filter_query_formats(AVFilterContext *ctx)
 315 {
 316     int ret, i;
 317     AVFilterFormats *formats;
 318     AVFilterChannelLayouts *chlayouts;
 319     AVFilterFormats *samplerates;
 320     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 321                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 322                             AVMEDIA_TYPE_VIDEO;
 323
 324     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 325         if (ret != AVERROR(EAGAIN))
 326             av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 327                    ctx->name, av_err2str(ret));
 328         return ret;
 329     }
 330
 331     for (i = 0; i < ctx->nb_inputs; i++)
 332         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 333     for (i = 0; i < ctx->nb_outputs; i++)
 334         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 335
 336     formats = ff_all_formats(type);
 337     if ((ret = ff_set_common_formats(ctx, formats)) < 0)
 338         return ret;
 339     if (type == AVMEDIA_TYPE_AUDIO) {
 340         samplerates = ff_all_samplerates();
 341         if ((ret = ff_set_common_samplerates(ctx, samplerates)) < 0)
 342             return ret;
 343         chlayouts = ff_all_channel_layouts();
 344         if ((ret = ff_set_common_channel_layouts(ctx, chlayouts)) < 0)
 345             return ret;
 346     }
 347     return 0;
 348 }
 349
 350 static int formats_declared(AVFilterContext *f)
 351 {
 352     int i;
 353
 354     for (i = 0; i < f->nb_inputs; i++) {
 355         if (!f->inputs[i]->out_formats)
 356             return 0;
 357         if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 358             !(f->inputs[i]->out_samplerates &&
 359               f->inputs[i]->out_channel_layouts))
 360             return 0;
 361     }
 362     for (i = 0; i < f->nb_outputs; i++) {
 363         if (!f->outputs[i]->in_formats)
 364             return 0;
 365         if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
 366             !(f->outputs[i]->in_samplerates &&
 367               f->outputs[i]->in_channel_layouts))
 368             return 0;
 369     }
 370     return 1;
 371 }
 372
 373 static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
 374 {
 375     AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
 376     if (a) {
 377         a->refcount = 0;
 378         a->refs     = NULL;
 379         a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
 380         if (!a->formats && arg->formats)
 381             av_freep(&a);
 382     }
 383     return a;
 384 }
 385
 386 static int can_merge_formats(AVFilterFormats *a_arg,
 387                              AVFilterFormats *b_arg,
 388                              enum AVMediaType type,
 389                              int is_sample_rate)
 390 {
 391     AVFilterFormats *a, *b, *ret;
 392     if (a_arg == b_arg)
 393         return 1;
 394     a = clone_filter_formats(a_arg);
 395     b = clone_filter_formats(b_arg);
 396
 397     if (!a || !b) {
 398         if (a)
 399             av_freep(&a->formats);
 400         if (b)
 401             av_freep(&b->formats);
 402
 403         av_freep(&a);
 404         av_freep(&b);
 405
 406         return 0;
 407     }
 408
 409     if (is_sample_rate) {
 410         ret = ff_merge_samplerates(a, b);
 411     } else {
 412         ret = ff_merge_formats(a, b, type);
 413     }
 414     if (ret) {
 415         av_freep(&ret->formats);
 416         av_freep(&ret->refs);
 417         av_freep(&ret);
 418         return 1;
 419     } else {
 420         av_freep(&a->formats);
 421         av_freep(&b->formats);
 422         av_freep(&a);
 423         av_freep(&b);
 424         return 0;
 425     }
 426 }
 427
 428 /**
 429  * Perform one round of query_formats() and merging formats lists on the
 430  * filter graph.
 431  * @return  >=0 if all links formats lists could be queried and merged;
 432  *          AVERROR(EAGAIN) some progress was made in the queries or merging
 433  *          and a later call may succeed;
 434  *          AVERROR(EIO) (may be changed) plus a log message if no progress
 435  *          was made and the negotiation is stuck;
 436  *          a negative error code if some other error happened
 437  */
 438 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 439 {
 440     int i, j, ret;
 441     int scaler_count = 0, resampler_count = 0;
 442     int count_queried = 0;        /* successful calls to query_formats() */
 443     int count_merged = 0;         /* successful merge of formats lists */
 444     int count_already_merged = 0; /* lists already merged */
 445     int count_delayed = 0;        /* lists that need to be merged later */
 446
 447     for (i = 0; i < graph->nb_filters; i++) {
 448         AVFilterContext *f = graph->filters[i];
 449         if (formats_declared(f))
 450             continue;
 451         if (f->filter->query_formats)
 452             ret = filter_query_formats(f);
 453         else
 454             ret = ff_default_query_formats(f);
 455         if (ret < 0 && ret != AVERROR(EAGAIN))
 456             return ret;
 457         /* note: EAGAIN could indicate a partial success, not counted yet */
 458         count_queried += ret >= 0;
 459     }
 460
 461     /* go through and merge as many format lists as possible */
 462     for (i = 0; i < graph->nb_filters; i++) {
 463         AVFilterContext *filter = graph->filters[i];
 464
 465         for (j = 0; j < filter->nb_inputs; j++) {
 466             AVFilterLink *link = filter->inputs[j];
 467             int convert_needed = 0;
 468
 469             if (!link)
 470                 continue;
 471
 472             if (link->in_formats != link->out_formats
 473                 && link->in_formats && link->out_formats)
 474                 if (!can_merge_formats(link->in_formats, link->out_formats,
 475                                       link->type, 0))
 476                     convert_needed = 1;
 477             if (link->type == AVMEDIA_TYPE_AUDIO) {
 478                 if (link->in_samplerates != link->out_samplerates
 479                     && link->in_samplerates && link->out_samplerates)
 480                     if (!can_merge_formats(link->in_samplerates,
 481                                            link->out_samplerates,
 482                                            0, 1))
 483                         convert_needed = 1;
 484             }
 485
 486 #define MERGE_DISPATCH(field, statement)                                     \
 487             if (!(link->in_ ## field && link->out_ ## field)) {              \
 488                 count_delayed++;                                             \
 489             } else if (link->in_ ## field == link->out_ ## field) {          \
 490                 count_already_merged++;                                      \
 491             } else if (!convert_needed) {                                    \
 492                 count_merged++;                                              \
 493                 statement                                                    \
 494             }
 495
 496             if (link->type == AVMEDIA_TYPE_AUDIO) {
 497                 MERGE_DISPATCH(channel_layouts,
 498                     if (!ff_merge_channel_layouts(link->in_channel_layouts,
 499                                                   link->out_channel_layouts))
 500                         convert_needed = 1;
 501                 )
 502                 MERGE_DISPATCH(samplerates,
 503                     if (!ff_merge_samplerates(link->in_samplerates,
 504                                               link->out_samplerates))
 505                         convert_needed = 1;
 506                 )
 507             }
 508             MERGE_DISPATCH(formats,
 509                 if (!ff_merge_formats(link->in_formats, link->out_formats,
 510                                       link->type))
 511                     convert_needed = 1;
 512             )
 513 #undef MERGE_DISPATCH
 514
 515             if (convert_needed) {
 516                 AVFilterContext *convert;
 517                 const AVFilter *filter;
 518                 AVFilterLink *inlink, *outlink;
 519                 char scale_args[256];
 520                 char inst_name[30];
 521
 522                 if (graph->disable_auto_convert) {
 523                     av_log(log_ctx, AV_LOG_ERROR,
 524                            "The filters '%s' and '%s' do not have a common format "
 525                            "and automatic conversion is disabled.\n",
 526                            link->src->name, link->dst->name);
 527                     return AVERROR(EINVAL);
 528                 }
 529
 530                 /* couldn't merge format lists. auto-insert conversion filter */
 531                 switch (link->type) {
 532                 case AVMEDIA_TYPE_VIDEO:
 533                     if (!(filter = avfilter_get_by_name("scale"))) {
 534                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 535                                "not present, cannot convert pixel formats.\n");
 536                         return AVERROR(EINVAL);
 537                     }
 538
 539                     snprintf(inst_name, sizeof(inst_name), "auto_scaler_%d",
 540                              scaler_count++);
 541
 542                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 543                                                             inst_name, graph->scale_sws_opts, NULL,
 544                                                             graph)) < 0)
 545                         return ret;
 546                     break;
 547                 case AVMEDIA_TYPE_AUDIO:
 548                     if (!(filter = avfilter_get_by_name("aresample"))) {
 549                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 550                                "not present, cannot convert audio formats.\n");
 551                         return AVERROR(EINVAL);
 552                     }
 553
 554                     snprintf(inst_name, sizeof(inst_name), "auto_resampler_%d",
 555                              resampler_count++);
 556                     scale_args[0] = '\0';
 557                     if (graph->aresample_swr_opts)
 558                         snprintf(scale_args, sizeof(scale_args), "%s",
 559                                  graph->aresample_swr_opts);
 560                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 561                                                             inst_name, graph->aresample_swr_opts,
 562                                                             NULL, graph)) < 0)
 563                         return ret;
 564                     break;
 565                 default:
 566                     return AVERROR(EINVAL);
 567                 }
 568
 569                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 570                     return ret;
 571
 572                 if ((ret = filter_query_formats(convert)) < 0)
 573                     return ret;
 574
 575                 inlink  = convert->inputs[0];
 576                 outlink = convert->outputs[0];
 577                 av_assert0( inlink-> in_formats->refcount > 0);
 578                 av_assert0( inlink->out_formats->refcount > 0);
 579                 av_assert0(outlink-> in_formats->refcount > 0);
 580                 av_assert0(outlink->out_formats->refcount > 0);
 581                 if (outlink->type == AVMEDIA_TYPE_AUDIO) {
 582                     av_assert0( inlink-> in_samplerates->refcount > 0);
 583                     av_assert0( inlink->out_samplerates->refcount > 0);
 584                     av_assert0(outlink-> in_samplerates->refcount > 0);
 585                     av_assert0(outlink->out_samplerates->refcount > 0);
 586                     av_assert0( inlink-> in_channel_layouts->refcount > 0);
 587                     av_assert0( inlink->out_channel_layouts->refcount > 0);
 588                     av_assert0(outlink-> in_channel_layouts->refcount > 0);
 589                     av_assert0(outlink->out_channel_layouts->refcount > 0);
 590                 }
 591                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 592                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 593                     ret = AVERROR(ENOSYS);
 594                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 595                     (!ff_merge_samplerates(inlink->in_samplerates,
 596                                            inlink->out_samplerates) ||
 597                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 598                                                inlink->out_channel_layouts)))
 599                     ret = AVERROR(ENOSYS);
 600                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 601                     (!ff_merge_samplerates(outlink->in_samplerates,
 602                                            outlink->out_samplerates) ||
 603                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 604                                                outlink->out_channel_layouts)))
 605                     ret = AVERROR(ENOSYS);
 606
 607                 if (ret < 0) {
 608                     av_log(log_ctx, AV_LOG_ERROR,
 609                            "Impossible to convert between the formats supported by the filter "
 610                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 611                     return ret;
 612                 }
 613             }
 614         }
 615     }
 616
 617     av_log(graph, AV_LOG_DEBUG, "query_formats: "
 618            "%d queried, %d merged, %d already done, %d delayed\n",
 619            count_queried, count_merged, count_already_merged, count_delayed);
 620     if (count_delayed) {
 621         AVBPrint bp;
 622
 623         /* if count_queried > 0, one filter at least did set its formats,
 624            that will give additional information to its neighbour;
 625            if count_merged > 0, one pair of formats lists at least was merged,
 626            that will give additional information to all connected filters;
 627            in both cases, progress was made and a new round must be done */
 628         if (count_queried || count_merged)
 629             return AVERROR(EAGAIN);
 630         av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 631         for (i = 0; i < graph->nb_filters; i++)
 632             if (!formats_declared(graph->filters[i]))
 633                 av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
 634                           graph->filters[i]->name);
 635         av_log(graph, AV_LOG_ERROR,
 636                "The following filters could not choose their formats: %s\n"
 637                "Consider inserting the (a)format filter near their input or "
 638                "output.\n", bp.str);
 639         return AVERROR(EIO);
 640     }
 641     return 0;
 642 }
 643
 644 static int get_fmt_score(enum AVSampleFormat dst_fmt, enum AVSampleFormat src_fmt)
 645 {
 646     int score = 0;
 647
 648     if (av_sample_fmt_is_planar(dst_fmt) != av_sample_fmt_is_planar(src_fmt))
 649         score ++;
 650
 651     if (av_get_bytes_per_sample(dst_fmt) < av_get_bytes_per_sample(src_fmt)) {
 652         score += 100 * (av_get_bytes_per_sample(src_fmt) - av_get_bytes_per_sample(dst_fmt));
 653     }else
 654         score += 10  * (av_get_bytes_per_sample(dst_fmt) - av_get_bytes_per_sample(src_fmt));
 655
 656     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_S32 &&
 657         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_FLT)
 658         score += 20;
 659
 660     if (av_get_packed_sample_fmt(dst_fmt) == AV_SAMPLE_FMT_FLT &&
 661         av_get_packed_sample_fmt(src_fmt) == AV_SAMPLE_FMT_S32)
 662         score += 2;
 663
 664     return score;
 665 }
 666
 667 static enum AVSampleFormat find_best_sample_fmt_of_2(enum AVSampleFormat dst_fmt1, enum AVSampleFormat dst_fmt2,
 668                                                      enum AVSampleFormat src_fmt)
 669 {
 670     int score1, score2;
 671
 672     score1 = get_fmt_score(dst_fmt1, src_fmt);
 673     score2 = get_fmt_score(dst_fmt2, src_fmt);
 674
 675     return score1 < score2 ? dst_fmt1 : dst_fmt2;
 676 }
 677
 678 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 679 {
 680     if (!link || !link->in_formats)
 681         return 0;
 682
 683     if (link->type == AVMEDIA_TYPE_VIDEO) {
 684         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 685             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 686             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 687             int i;
 688             for (i=0; i<link->in_formats->nb_formats; i++) {
 689                 enum AVPixelFormat p = link->in_formats->formats[i];
 690                 best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 691             }
 692             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 693                    av_get_pix_fmt_name(best), link->in_formats->nb_formats,
 694                    av_get_pix_fmt_name(ref->format), has_alpha);
 695             link->in_formats->formats[0] = best;
 696         }
 697     } else if (link->type == AVMEDIA_TYPE_AUDIO) {
 698         if(ref && ref->type == AVMEDIA_TYPE_AUDIO){
 699             enum AVSampleFormat best= AV_SAMPLE_FMT_NONE;
 700             int i;
 701             for (i=0; i<link->in_formats->nb_formats; i++) {
 702                 enum AVSampleFormat p = link->in_formats->formats[i];
 703                 best = find_best_sample_fmt_of_2(best, p, ref->format);
 704             }
 705             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s\n",
 706                    av_get_sample_fmt_name(best), link->in_formats->nb_formats,
 707                    av_get_sample_fmt_name(ref->format));
 708             link->in_formats->formats[0] = best;
 709         }
 710     }
 711
 712     link->in_formats->nb_formats = 1;
 713     link->format = link->in_formats->formats[0];
 714
 715     if (link->type == AVMEDIA_TYPE_AUDIO) {
 716         if (!link->in_samplerates->nb_formats) {
 717             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 718                    " the link between filters %s and %s.\n", link->src->name,
 719                    link->dst->name);
 720             return AVERROR(EINVAL);
 721         }
 722         link->in_samplerates->nb_formats = 1;
 723         link->sample_rate = link->in_samplerates->formats[0];
 724
 725         if (link->in_channel_layouts->all_layouts) {
 726             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 727                    " the link between filters %s and %s.\n", link->src->name,
 728                    link->dst->name);
 729             if (!link->in_channel_layouts->all_counts)
 730                 av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
 731                        "supported, try specifying a channel layout using "
 732                        "'aformat=channel_layouts=something'.\n");
 733             return AVERROR(EINVAL);
 734         }
 735         link->in_channel_layouts->nb_channel_layouts = 1;
 736         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 737         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 738             link->channel_layout = 0;
 739         else
 740             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 741     }
 742
 743     ff_formats_unref(&link->in_formats);
 744     ff_formats_unref(&link->out_formats);
 745     ff_formats_unref(&link->in_samplerates);
 746     ff_formats_unref(&link->out_samplerates);
 747     ff_channel_layouts_unref(&link->in_channel_layouts);
 748     ff_channel_layouts_unref(&link->out_channel_layouts);
 749
 750     return 0;
 751 }
 752
 753 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format, unref_format) \
 754 do {                                                                   \
 755     for (i = 0; i < filter->nb_inputs; i++) {                          \
 756         AVFilterLink *link = filter->inputs[i];                        \
 757         fmt_type fmt;                                                  \
 758                                                                        \
 759         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 760             continue;                                                  \
 761         fmt = link->out_ ## list->var[0];                              \
 762                                                                        \
 763         for (j = 0; j < filter->nb_outputs; j++) {                     \
 764             AVFilterLink *out_link = filter->outputs[j];               \
 765             list_type *fmts;                                           \
 766                                                                        \
 767             if (link->type != out_link->type ||                        \
 768                 out_link->in_ ## list->nb == 1)                        \
 769                 continue;                                              \
 770             fmts = out_link->in_ ## list;                              \
 771                                                                        \
 772             if (!out_link->in_ ## list->nb) {                          \
 773                 if ((ret = add_format(&out_link->in_ ##list, fmt)) < 0)\
 774                     return ret;                                        \
 775                 ret = 1;                                               \
 776                 break;                                                 \
 777             }                                                          \
 778                                                                        \
 779             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 780                 if (fmts->var[k] == fmt) {                             \
 781                     fmts->var[0]  = fmt;                               \
 782                     fmts->nb = 1;                                      \
 783                     ret = 1;                                           \
 784                     break;                                             \
 785                 }                                                      \
 786         }                                                              \
 787     }                                                                  \
 788 } while (0)
 789
 790 static int reduce_formats_on_filter(AVFilterContext *filter)
 791 {
 792     int i, j, k, ret = 0;
 793
 794     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 795                    nb_formats, ff_add_format, ff_formats_unref);
 796     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 797                    nb_formats, ff_add_format, ff_formats_unref);
 798
 799     /* reduce channel layouts */
 800     for (i = 0; i < filter->nb_inputs; i++) {
 801         AVFilterLink *inlink = filter->inputs[i];
 802         uint64_t fmt;
 803
 804         if (!inlink->out_channel_layouts ||
 805             inlink->out_channel_layouts->nb_channel_layouts != 1)
 806             continue;
 807         fmt = inlink->out_channel_layouts->channel_layouts[0];
 808
 809         for (j = 0; j < filter->nb_outputs; j++) {
 810             AVFilterLink *outlink = filter->outputs[j];
 811             AVFilterChannelLayouts *fmts;
 812
 813             fmts = outlink->in_channel_layouts;
 814             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 815                 continue;
 816
 817             if (fmts->all_layouts &&
 818                 (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
 819                 /* Turn the infinite list into a singleton */
 820                 fmts->all_layouts = fmts->all_counts  = 0;
 821                 if (ff_add_channel_layout(&outlink->in_channel_layouts, fmt) < 0)
 822                     ret = 1;
 823                 break;
 824             }
 825
 826             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 827                 if (fmts->channel_layouts[k] == fmt) {
 828                     fmts->channel_layouts[0]  = fmt;
 829                     fmts->nb_channel_layouts = 1;
 830                     ret = 1;
 831                     break;
 832                 }
 833             }
 834         }
 835     }
 836
 837     return ret;
 838 }
 839
 840 static int reduce_formats(AVFilterGraph *graph)
 841 {
 842     int i, reduced, ret;
 843
 844     do {
 845         reduced = 0;
 846
 847         for (i = 0; i < graph->nb_filters; i++) {
 848             if ((ret = reduce_formats_on_filter(graph->filters[i])) < 0)
 849                 return ret;
 850             reduced |= ret;
 851         }
 852     } while (reduced);
 853
 854     return 0;
 855 }
 856
 857 static void swap_samplerates_on_filter(AVFilterContext *filter)
 858 {
 859     AVFilterLink *link = NULL;
 860     int sample_rate;
 861     int i, j;
 862
 863     for (i = 0; i < filter->nb_inputs; i++) {
 864         link = filter->inputs[i];
 865
 866         if (link->type == AVMEDIA_TYPE_AUDIO &&
 867             link->out_samplerates->nb_formats== 1)
 868             break;
 869     }
 870     if (i == filter->nb_inputs)
 871         return;
 872
 873     sample_rate = link->out_samplerates->formats[0];
 874
 875     for (i = 0; i < filter->nb_outputs; i++) {
 876         AVFilterLink *outlink = filter->outputs[i];
 877         int best_idx, best_diff = INT_MAX;
 878
 879         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 880             outlink->in_samplerates->nb_formats < 2)
 881             continue;
 882
 883         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
 884             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 885
 886             av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
 887
 888             if (diff < best_diff) {
 889                 best_diff = diff;
 890                 best_idx  = j;
 891             }
 892         }
 893         FFSWAP(int, outlink->in_samplerates->formats[0],
 894                outlink->in_samplerates->formats[best_idx]);
 895     }
 896 }
 897
 898 static void swap_samplerates(AVFilterGraph *graph)
 899 {
 900     int i;
 901
 902     for (i = 0; i < graph->nb_filters; i++)
 903         swap_samplerates_on_filter(graph->filters[i]);
 904 }
 905
 906 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 907 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 908 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 909 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 910 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 911 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 912 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 913
 914 /* allowable substitutions for channel pairs when comparing layouts,
 915  * ordered by priority for both values */
 916 static const uint64_t ch_subst[][2] = {
 917     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 918     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 919     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 920     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 921     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 922     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 923     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 924     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 925     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 926     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 927     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 928     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 929     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 930     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 931     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 932     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 933     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 934     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 935     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 936     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 937     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 938 };
 939
 940 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 941 {
 942     AVFilterLink *link = NULL;
 943     int i, j, k;
 944
 945     for (i = 0; i < filter->nb_inputs; i++) {
 946         link = filter->inputs[i];
 947
 948         if (link->type == AVMEDIA_TYPE_AUDIO &&
 949             link->out_channel_layouts->nb_channel_layouts == 1)
 950             break;
 951     }
 952     if (i == filter->nb_inputs)
 953         return;
 954
 955     for (i = 0; i < filter->nb_outputs; i++) {
 956         AVFilterLink *outlink = filter->outputs[i];
 957         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 958
 959         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 960             outlink->in_channel_layouts->nb_channel_layouts < 2)
 961             continue;
 962
 963         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 964             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 965             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 966             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 967             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 968             int count_diff        = out_channels - in_channels;
 969             int matched_channels, extra_channels;
 970             int score = 100000;
 971
 972             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 973                 /* Compute score in case the input or output layout encodes
 974                    a channel count; in this case the score is not altered by
 975                    the computation afterwards, as in_chlayout and
 976                    out_chlayout have both been set to 0 */
 977                 if (FF_LAYOUT2COUNT(in_chlayout))
 978                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 979                 if (FF_LAYOUT2COUNT(out_chlayout))
 980                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 981                 score -= 10000 + FFABS(out_channels - in_channels) +
 982                          (in_channels > out_channels ? 10000 : 0);
 983                 in_chlayout = out_chlayout = 0;
 984                 /* Let the remaining computation run, even if the score
 985                    value is not altered */
 986             }
 987
 988             /* channel substitution */
 989             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 990                 uint64_t cmp0 = ch_subst[k][0];
 991                 uint64_t cmp1 = ch_subst[k][1];
 992                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 993                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 994                     in_chlayout  &= ~cmp0;
 995                     out_chlayout &= ~cmp1;
 996                     /* add score for channel match, minus a deduction for
 997                        having to do the substitution */
 998                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 999                 }
1000             }
1001
1002             /* no penalty for LFE channel mismatch */
1003             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
1004                 (out_chlayout & AV_CH_LOW_FREQUENCY))
1005                 score += 10;
1006             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
1007             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
1008
1009             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
1010                                                                  out_chlayout);
1011             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
1012                                                                  (~in_chlayout));
1013             score += 10 * matched_channels - 5 * extra_channels;
1014
1015             if (score > best_score ||
1016                 (count_diff < best_count_diff && score == best_score)) {
1017                 best_score = score;
1018                 best_idx   = j;
1019                 best_count_diff = count_diff;
1020             }
1021         }
1022         av_assert0(best_idx >= 0);
1023         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
1024                outlink->in_channel_layouts->channel_layouts[best_idx]);
1025     }
1026
1027 }
1028
1029 static void swap_channel_layouts(AVFilterGraph *graph)
1030 {
1031     int i;
1032
1033     for (i = 0; i < graph->nb_filters; i++)
1034         swap_channel_layouts_on_filter(graph->filters[i]);
1035 }
1036
1037 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
1038 {
1039     AVFilterLink *link = NULL;
1040     int format, bps;
1041     int i, j;
1042
1043     for (i = 0; i < filter->nb_inputs; i++) {
1044         link = filter->inputs[i];
1045
1046         if (link->type == AVMEDIA_TYPE_AUDIO &&
1047             link->out_formats->nb_formats == 1)
1048             break;
1049     }
1050     if (i == filter->nb_inputs)
1051         return;
1052
1053     format = link->out_formats->formats[0];
1054     bps    = av_get_bytes_per_sample(format);
1055
1056     for (i = 0; i < filter->nb_outputs; i++) {
1057         AVFilterLink *outlink = filter->outputs[i];
1058         int best_idx = -1, best_score = INT_MIN;
1059
1060         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
1061             outlink->in_formats->nb_formats < 2)
1062             continue;
1063
1064         for (j = 0; j < outlink->in_formats->nb_formats; j++) {
1065             int out_format = outlink->in_formats->formats[j];
1066             int out_bps    = av_get_bytes_per_sample(out_format);
1067             int score;
1068
1069             if (av_get_packed_sample_fmt(out_format) == format ||
1070                 av_get_planar_sample_fmt(out_format) == format) {
1071                 best_idx   = j;
1072                 break;
1073             }
1074
1075             /* for s32 and float prefer double to prevent loss of information */
1076             if (bps == 4 && out_bps == 8) {
1077                 best_idx = j;
1078                 break;
1079             }
1080
1081             /* prefer closest higher or equal bps */
1082             score = -abs(out_bps - bps);
1083             if (out_bps >= bps)
1084                 score += INT_MAX/2;
1085
1086             if (score > best_score) {
1087                 best_score = score;
1088                 best_idx   = j;
1089             }
1090         }
1091         av_assert0(best_idx >= 0);
1092         FFSWAP(int, outlink->in_formats->formats[0],
1093                outlink->in_formats->formats[best_idx]);
1094     }
1095 }
1096
1097 static void swap_sample_fmts(AVFilterGraph *graph)
1098 {
1099     int i;
1100
1101     for (i = 0; i < graph->nb_filters; i++)
1102         swap_sample_fmts_on_filter(graph->filters[i]);
1103
1104 }
1105
1106 static int pick_formats(AVFilterGraph *graph)
1107 {
1108     int i, j, ret;
1109     int change;
1110
1111     do{
1112         change = 0;
1113         for (i = 0; i < graph->nb_filters; i++) {
1114             AVFilterContext *filter = graph->filters[i];
1115             if (filter->nb_inputs){
1116                 for (j = 0; j < filter->nb_inputs; j++){
1117                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
1118                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1119                             return ret;
1120                         change = 1;
1121                     }
1122                 }
1123             }
1124             if (filter->nb_outputs){
1125                 for (j = 0; j < filter->nb_outputs; j++){
1126                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
1127                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1128                             return ret;
1129                         change = 1;
1130                     }
1131                 }
1132             }
1133             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
1134                 for (j = 0; j < filter->nb_outputs; j++) {
1135                     if(filter->outputs[j]->format<0) {
1136                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
1137                             return ret;
1138                         change = 1;
1139                     }
1140                 }
1141             }
1142         }
1143     }while(change);
1144
1145     for (i = 0; i < graph->nb_filters; i++) {
1146         AVFilterContext *filter = graph->filters[i];
1147
1148         for (j = 0; j < filter->nb_inputs; j++)
1149             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
1150                 return ret;
1151         for (j = 0; j < filter->nb_outputs; j++)
1152             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
1153                 return ret;
1154     }
1155     return 0;
1156 }
1157
1158 /**
1159  * Configure the formats of all the links in the graph.
1160  */
1161 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
1162 {
1163     int ret;
1164
1165     /* find supported formats from sub-filters, and merge along links */
1166     while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
1167         av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
1168     if (ret < 0)
1169         return ret;
1170
1171     /* Once everything is merged, it's possible that we'll still have
1172      * multiple valid media format choices. We try to minimize the amount
1173      * of format conversion inside filters */
1174     if ((ret = reduce_formats(graph)) < 0)
1175         return ret;
1176
1177     /* for audio filters, ensure the best format, sample rate and channel layout
1178      * is selected */
1179     swap_sample_fmts(graph);
1180     swap_samplerates(graph);
1181     swap_channel_layouts(graph);
1182
1183     if ((ret = pick_formats(graph)) < 0)
1184         return ret;
1185
1186     return 0;
1187 }
1188
1189 static int graph_config_pointers(AVFilterGraph *graph,
1190                                              AVClass *log_ctx)
1191 {
1192     unsigned i, j;
1193     int sink_links_count = 0, n = 0;
1194     AVFilterContext *f;
1195     AVFilterLink **sinks;
1196
1197     for (i = 0; i < graph->nb_filters; i++) {
1198         f = graph->filters[i];
1199         for (j = 0; j < f->nb_inputs; j++) {
1200             f->inputs[j]->graph     = graph;
1201             f->inputs[j]->age_index = -1;
1202         }
1203         for (j = 0; j < f->nb_outputs; j++) {
1204             f->outputs[j]->graph    = graph;
1205             f->outputs[j]->age_index= -1;
1206         }
1207         if (!f->nb_outputs) {
1208             if (f->nb_inputs > INT_MAX - sink_links_count)
1209                 return AVERROR(EINVAL);
1210             sink_links_count += f->nb_inputs;
1211         }
1212     }
1213     sinks = av_calloc(sink_links_count, sizeof(*sinks));
1214     if (!sinks)
1215         return AVERROR(ENOMEM);
1216     for (i = 0; i < graph->nb_filters; i++) {
1217         f = graph->filters[i];
1218         if (!f->nb_outputs) {
1219             for (j = 0; j < f->nb_inputs; j++) {
1220                 sinks[n] = f->inputs[j];
1221                 f->inputs[j]->age_index = n++;
1222             }
1223         }
1224     }
1225     av_assert0(n == sink_links_count);
1226     graph->sink_links       = sinks;
1227     graph->sink_links_count = sink_links_count;
1228     return 0;
1229 }
1230
1231 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
1232 {
1233     AVFilterContext *f;
1234     int i, j, ret;
1235     int fifo_count = 0;
1236
1237     for (i = 0; i < graph->nb_filters; i++) {
1238         f = graph->filters[i];
1239
1240         for (j = 0; j < f->nb_inputs; j++) {
1241             AVFilterLink *link = f->inputs[j];
1242             AVFilterContext *fifo_ctx;
1243             const AVFilter *fifo;
1244             char name[32];
1245
1246             if (!link->dstpad->needs_fifo)
1247                 continue;
1248
1249             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1250                    avfilter_get_by_name("fifo") :
1251                    avfilter_get_by_name("afifo");
1252
1253             snprintf(name, sizeof(name), "auto_fifo_%d", fifo_count++);
1254
1255             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1256                                                NULL, graph);
1257             if (ret < 0)
1258                 return ret;
1259
1260             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1261             if (ret < 0)
1262                 return ret;
1263         }
1264     }
1265
1266     return 0;
1267 }
1268
1269 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1270 {
1271     int ret;
1272
1273     if ((ret = graph_check_validity(graphctx, log_ctx)))
1274         return ret;
1275     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1276         return ret;
1277     if ((ret = graph_config_formats(graphctx, log_ctx)))
1278         return ret;
1279     if ((ret = graph_config_links(graphctx, log_ctx)))
1280         return ret;
1281     if ((ret = graph_check_links(graphctx, log_ctx)))
1282         return ret;
1283     if ((ret = graph_config_pointers(graphctx, log_ctx)))
1284         return ret;
1285
1286     return 0;
1287 }
1288
1289 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1290 {
1291     int i, r = AVERROR(ENOSYS);
1292
1293     if (!graph)
1294         return r;
1295
1296     if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1297         r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1298         if (r != AVERROR(ENOSYS))
1299             return r;
1300     }
1301
1302     if (res_len && res)
1303         res[0] = 0;
1304
1305     for (i = 0; i < graph->nb_filters; i++) {
1306         AVFilterContext *filter = graph->filters[i];
1307         if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
1308             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1309             if (r != AVERROR(ENOSYS)) {
1310                 if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
1311                     return r;
1312             }
1313         }
1314     }
1315
1316     return r;
1317 }
1318
1319 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1320 {
1321     int i;
1322
1323     if(!graph)
1324         return 0;
1325
1326     for (i = 0; i < graph->nb_filters; i++) {
1327         AVFilterContext *filter = graph->filters[i];
1328         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1329             AVFilterCommand **queue = &filter->command_queue, *next;
1330             while (*queue && (*queue)->time <= ts)
1331                 queue = &(*queue)->next;
1332             next = *queue;
1333             *queue = av_mallocz(sizeof(AVFilterCommand));
1334             if (!*queue)
1335                 return AVERROR(ENOMEM);
1336
1337             (*queue)->command = av_strdup(command);
1338             (*queue)->arg     = av_strdup(arg);
1339             (*queue)->time    = ts;
1340             (*queue)->flags   = flags;
1341             (*queue)->next    = next;
1342             if(flags & AVFILTER_CMD_FLAG_ONE)
1343                 return 0;
1344         }
1345     }
1346
1347     return 0;
1348 }
1349
1350 static void heap_bubble_up(AVFilterGraph *graph,
1351                            AVFilterLink *link, int index)
1352 {
1353     AVFilterLink **links = graph->sink_links;
1354
1355     av_assert0(index >= 0);
1356
1357     while (index) {
1358         int parent = (index - 1) >> 1;
1359         if (links[parent]->current_pts_us >= link->current_pts_us)
1360             break;
1361         links[index] = links[parent];
1362         links[index]->age_index = index;
1363         index = parent;
1364     }
1365     links[index] = link;
1366     link->age_index = index;
1367 }
1368
1369 static void heap_bubble_down(AVFilterGraph *graph,
1370                              AVFilterLink *link, int index)
1371 {
1372     AVFilterLink **links = graph->sink_links;
1373
1374     av_assert0(index >= 0);
1375
1376     while (1) {
1377         int child = 2 * index + 1;
1378         if (child >= graph->sink_links_count)
1379             break;
1380         if (child + 1 < graph->sink_links_count &&
1381             links[child + 1]->current_pts_us < links[child]->current_pts_us)
1382             child++;
1383         if (link->current_pts_us < links[child]->current_pts_us)
1384             break;
1385         links[index] = links[child];
1386         links[index]->age_index = index;
1387         index = child;
1388     }
1389     links[index] = link;
1390     link->age_index = index;
1391 }
1392
1393 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1394 {
1395     heap_bubble_up  (graph, link, link->age_index);
1396     heap_bubble_down(graph, link, link->age_index);
1397 }
1398
1399 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1400 {
1401     AVFilterLink *oldest = graph->sink_links[0];
1402     int64_t frame_count;
1403     int r;
1404
1405     while (graph->sink_links_count) {
1406         oldest = graph->sink_links[0];
1407         if (oldest->dst->filter->activate) {
1408             /* For now, buffersink is the only filter implementing activate. */
1409             r = av_buffersink_get_frame_flags(oldest->dst, NULL,
1410                                               AV_BUFFERSINK_FLAG_PEEK);
1411             if (r != AVERROR_EOF)
1412                 return r;
1413         } else {
1414             r = ff_request_frame(oldest);
1415         }
1416         if (r != AVERROR_EOF)
1417             break;
1418         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1419                oldest->dst ? oldest->dst->name : "unknown",
1420                oldest->dstpad ? oldest->dstpad->name : "unknown");
1421         /* EOF: remove the link from the heap */
1422         if (oldest->age_index < --graph->sink_links_count)
1423             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1424                              oldest->age_index);
1425         oldest->age_index = -1;
1426     }
1427     if (!graph->sink_links_count)
1428         return AVERROR_EOF;
1429     av_assert1(!oldest->dst->filter->activate);
1430     av_assert1(oldest->age_index >= 0);
1431     frame_count = oldest->frame_count_out;
1432     while (frame_count == oldest->frame_count_out) {
1433         r = ff_filter_graph_run_once(graph);
1434         if (r == AVERROR(EAGAIN) &&
1435             !oldest->frame_wanted_out && !oldest->frame_blocked_in &&
1436             !oldest->status_in)
1437             ff_request_frame(oldest);
1438         else if (r < 0)
1439             return r;
1440     }
1441     return 0;
1442 }
1443
1444 int ff_filter_graph_run_once(AVFilterGraph *graph)
1445 {
1446     AVFilterContext *filter;
1447     unsigned i;
1448
1449     av_assert0(graph->nb_filters);
1450     filter = graph->filters[0];
1451     for (i = 1; i < graph->nb_filters; i++)
1452         if (graph->filters[i]->ready > filter->ready)
1453             filter = graph->filters[i];
1454     if (!filter->ready)
1455         return AVERROR(EAGAIN);
1456     return ff_filter_activate(filter);
1457 }