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