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