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 <ctype.h>
  24 #include <string.h>
  25
  26 #include "libavutil/audioconvert.h"
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "avfilter.h"
  30 #include "avfiltergraph.h"
  31 #include "formats.h"
  32 #include "internal.h"
  33
  34 #include "libavutil/audioconvert.h"
  35 #include "libavutil/log.h"
  36
  37 static const AVClass filtergraph_class = {
  38     .class_name = "AVFilterGraph",
  39     .item_name  = av_default_item_name,
  40     .version    = LIBAVUTIL_VERSION_INT,
  41 };
  42
  43 AVFilterGraph *avfilter_graph_alloc(void)
  44 {
  45     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  46     if (!ret)
  47         return NULL;
  48 #if FF_API_GRAPH_AVCLASS
  49     ret->av_class = &filtergraph_class;
  50 #endif
  51     return ret;
  52 }
  53
  54 void avfilter_graph_free(AVFilterGraph **graph)
  55 {
  56     if (!*graph)
  57         return;
  58     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  59         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  60     av_freep(&(*graph)->sink_links);
  61     av_freep(&(*graph)->scale_sws_opts);
  62     av_freep(&(*graph)->filters);
  63     av_freep(graph);
  64 }
  65
  66 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  67 {
  68     AVFilterContext **filters = av_realloc(graph->filters,
  69                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  70     if (!filters)
  71         return AVERROR(ENOMEM);
  72
  73     graph->filters = filters;
  74     graph->filters[graph->filter_count++] = filter;
  75
  76     return 0;
  77 }
  78
  79 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  80                                  const char *name, const char *args, void *opaque,
  81                                  AVFilterGraph *graph_ctx)
  82 {
  83     int ret;
  84
  85     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  86         goto fail;
  87     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  88         goto fail;
  89     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  90         goto fail;
  91     return 0;
  92
  93 fail:
  94     if (*filt_ctx)
  95         avfilter_free(*filt_ctx);
  96     *filt_ctx = NULL;
  97     return ret;
  98 }
  99
 100 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 101 {
 102     graph->disable_auto_convert = flags;
 103 }
 104
 105 /**
 106  * Check for the validity of graph.
 107  *
 108  * A graph is considered valid if all its input and output pads are
 109  * connected.
 110  *
 111  * @return 0 in case of success, a negative value otherwise
 112  */
 113 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 114 {
 115     AVFilterContext *filt;
 116     int i, j;
 117
 118     for (i = 0; i < graph->filter_count; i++) {
 119         filt = graph->filters[i];
 120
 121         for (j = 0; j < filt->nb_inputs; j++) {
 122             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 123                 av_log(log_ctx, AV_LOG_ERROR,
 124                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
 125                        filt->input_pads[j].name, filt->name, filt->filter->name);
 126                 return AVERROR(EINVAL);
 127             }
 128         }
 129
 130         for (j = 0; j < filt->nb_outputs; j++) {
 131             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 132                 av_log(log_ctx, AV_LOG_ERROR,
 133                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
 134                        filt->output_pads[j].name, filt->name, filt->filter->name);
 135                 return AVERROR(EINVAL);
 136             }
 137         }
 138     }
 139
 140     return 0;
 141 }
 142
 143 /**
 144  * Configure all the links of graphctx.
 145  *
 146  * @return 0 in case of success, a negative value otherwise
 147  */
 148 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 149 {
 150     AVFilterContext *filt;
 151     int i, ret;
 152
 153     for (i=0; i < graph->filter_count; i++) {
 154         filt = graph->filters[i];
 155
 156         if (!filt->nb_outputs) {
 157             if ((ret = avfilter_config_links(filt)))
 158                 return ret;
 159         }
 160     }
 161
 162     return 0;
 163 }
 164
 165 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 166 {
 167     int i;
 168
 169     for (i = 0; i < graph->filter_count; i++)
 170         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 171             return graph->filters[i];
 172
 173     return NULL;
 174 }
 175
 176 static int filter_query_formats(AVFilterContext *ctx)
 177 {
 178     int ret;
 179     AVFilterFormats *formats;
 180     AVFilterChannelLayouts *chlayouts;
 181     AVFilterFormats *samplerates;
 182     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 183                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 184                             AVMEDIA_TYPE_VIDEO;
 185
 186     if ((ret = ctx->filter->query_formats(ctx)) < 0)
 187         return ret;
 188
 189     formats = avfilter_make_all_formats(type);
 190     if (!formats)
 191         return AVERROR(ENOMEM);
 192     ff_set_common_formats(ctx, formats);
 193     if (type == AVMEDIA_TYPE_AUDIO) {
 194         samplerates = ff_all_samplerates();
 195         if (!samplerates)
 196             return AVERROR(ENOMEM);
 197         ff_set_common_samplerates(ctx, samplerates);
 198         chlayouts = ff_all_channel_layouts();
 199         if (!chlayouts)
 200             return AVERROR(ENOMEM);
 201         ff_set_common_channel_layouts(ctx, chlayouts);
 202     }
 203     return 0;
 204 }
 205
 206 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 207                               const char *filt_name, const char *filt_args)
 208 {
 209     static int auto_count = 0, ret;
 210     char inst_name[32];
 211     AVFilterContext *filt_ctx;
 212
 213     if (graph->disable_auto_convert) {
 214         av_log(NULL, AV_LOG_ERROR,
 215                "The filters '%s' and '%s' do not have a common format "
 216                "and automatic conversion is disabled.\n",
 217                link->src->name, link->dst->name);
 218         return AVERROR(EINVAL);
 219     }
 220
 221     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 222             filt_name, auto_count++);
 223
 224     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 225                                             avfilter_get_by_name(filt_name),
 226                                             inst_name, filt_args, NULL, graph)) < 0)
 227         return ret;
 228     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 229         return ret;
 230
 231     filter_query_formats(filt_ctx);
 232
 233     if ( ((link = filt_ctx-> inputs[0]) &&
 234            !ff_merge_formats(link->in_formats, link->out_formats)) ||
 235          ((link = filt_ctx->outputs[0]) &&
 236            !ff_merge_formats(link->in_formats, link->out_formats))
 237        ) {
 238         av_log(NULL, AV_LOG_ERROR,
 239                "Impossible to convert between the formats supported by the filter "
 240                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 241         return AVERROR(EINVAL);
 242     }
 243
 244     if (link->type == AVMEDIA_TYPE_AUDIO &&
 245          (((link = filt_ctx-> inputs[0]) &&
 246            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 247          ((link = filt_ctx->outputs[0]) &&
 248            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 249        ) {
 250         av_log(NULL, AV_LOG_ERROR,
 251                "Impossible to convert between the channel layouts formats supported by the filter "
 252                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 253         return AVERROR(EINVAL);
 254     }
 255
 256     return 0;
 257 }
 258
 259 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 260 {
 261     int i, j, ret;
 262     char filt_args[128];
 263     AVFilterFormats *formats;
 264     AVFilterChannelLayouts *chlayouts;
 265     AVFilterFormats *samplerates;
 266     int scaler_count = 0, resampler_count = 0;
 267
 268     for (j = 0; j < 2; j++) {
 269     /* ask all the sub-filters for their supported media formats */
 270     for (i = 0; i < graph->filter_count; i++) {
 271         /* Call query_formats on sources first.
 272            This is a temporary workaround for amerge,
 273            until format renegociation is implemented. */
 274         if (!graph->filters[i]->nb_inputs == j)
 275             continue;
 276         if (graph->filters[i]->filter->query_formats)
 277             ret = filter_query_formats(graph->filters[i]);
 278         else
 279             ret = ff_default_query_formats(graph->filters[i]);
 280         if (ret < 0)
 281             return ret;
 282     }
 283     }
 284
 285     /* go through and merge as many format lists as possible */
 286     for (i = 0; i < graph->filter_count; i++) {
 287         AVFilterContext *filter = graph->filters[i];
 288
 289         for (j = 0; j < filter->nb_inputs; j++) {
 290             AVFilterLink *link = filter->inputs[j];
 291 #if 0
 292             if (!link) continue;
 293
 294             if (!link->in_formats || !link->out_formats)
 295                 return AVERROR(EINVAL);
 296
 297             if (link->type == AVMEDIA_TYPE_VIDEO &&
 298                 !ff_merge_formats(link->in_formats, link->out_formats)) {
 299
 300                 /* couldn't merge format lists, auto-insert scale filter */
 301                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 302                          graph->scale_sws_opts);
 303                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 304                     return ret;
 305             }
 306             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 307                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 308                     return AVERROR(EINVAL);
 309
 310                 /* Merge all three list before checking: that way, in all
 311                  * three categories, aconvert will use a common format
 312                  * whenever possible. */
 313                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
 314                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 315                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 316
 317                 if (!formats || !chlayouts || !samplerates)
 318                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 319                        return ret;
 320 #else
 321             int convert_needed = 0;
 322
 323             if (!link)
 324                 continue;
 325
 326             if (link->in_formats != link->out_formats &&
 327                 !ff_merge_formats(link->in_formats,
 328                                         link->out_formats))
 329                 convert_needed = 1;
 330             if (link->type == AVMEDIA_TYPE_AUDIO) {
 331                 if (link->in_channel_layouts != link->out_channel_layouts &&
 332                     !ff_merge_channel_layouts(link->in_channel_layouts,
 333                                               link->out_channel_layouts))
 334                     convert_needed = 1;
 335                 if (link->in_samplerates != link->out_samplerates &&
 336                     !ff_merge_samplerates(link->in_samplerates,
 337                                           link->out_samplerates))
 338                     convert_needed = 1;
 339             }
 340
 341             if (convert_needed) {
 342                 AVFilterContext *convert;
 343                 AVFilter *filter;
 344                 AVFilterLink *inlink, *outlink;
 345                 char scale_args[256];
 346                 char inst_name[30];
 347
 348                 /* couldn't merge format lists. auto-insert conversion filter */
 349                 switch (link->type) {
 350                 case AVMEDIA_TYPE_VIDEO:
 351                     if (!(filter = avfilter_get_by_name("scale"))) {
 352                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 353                                "not present, cannot convert pixel formats.\n");
 354                         return AVERROR(EINVAL);
 355                     }
 356
 357                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 358                              scaler_count++);
 359                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 360                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 361                                                             inst_name, scale_args, NULL,
 362                                                             graph)) < 0)
 363                         return ret;
 364                     break;
 365                 case AVMEDIA_TYPE_AUDIO:
 366                     if (!(filter = avfilter_get_by_name("aresample"))) {
 367                         av_log(log_ctx, AV_LOG_ERROR, "'resample' filter "
 368                                "not present, cannot convert audio formats.\n");
 369                         return AVERROR(EINVAL);
 370                     }
 371
 372                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 373                              resampler_count++);
 374                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 375                                                             inst_name, NULL, NULL, graph)) < 0)
 376                         return ret;
 377                     break;
 378                 default:
 379                     return AVERROR(EINVAL);
 380                 }
 381
 382                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 383                     return ret;
 384
 385                 filter_query_formats(convert);
 386                 inlink  = convert->inputs[0];
 387                 outlink = convert->outputs[0];
 388                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 389                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 390                     ret |= AVERROR(ENOSYS);
 391                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 392                     (!ff_merge_samplerates(inlink->in_samplerates,
 393                                            inlink->out_samplerates) ||
 394                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 395                                                inlink->out_channel_layouts)))
 396                     ret |= AVERROR(ENOSYS);
 397                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 398                     (!ff_merge_samplerates(outlink->in_samplerates,
 399                                            outlink->out_samplerates) ||
 400                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 401                                                outlink->out_channel_layouts)))
 402                     ret |= AVERROR(ENOSYS);
 403
 404                 if (ret < 0) {
 405                     av_log(log_ctx, AV_LOG_ERROR,
 406                            "Impossible to convert between the formats supported by the filter "
 407                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 408                     return ret;
 409                 }
 410 #endif
 411             }
 412         }
 413     }
 414
 415     return 0;
 416 }
 417
 418 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 419 {
 420     if (!link || !link->in_formats)
 421         return 0;
 422
 423     if (link->type == AVMEDIA_TYPE_VIDEO) {
 424         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 425             int has_alpha= av_pix_fmt_descriptors[ref->format].nb_components % 2 == 0;
 426             enum PixelFormat best= PIX_FMT_NONE;
 427             int i;
 428             for (i=0; i<link->in_formats->format_count; i++) {
 429                 enum PixelFormat p = link->in_formats->formats[i];
 430                 best= avcodec_find_best_pix_fmt2(best, p, ref->format, has_alpha, NULL);
 431             }
 432             link->in_formats->formats[0] = best;
 433         }
 434     }
 435
 436     link->in_formats->format_count = 1;
 437     link->format = link->in_formats->formats[0];
 438
 439     if (link->type == AVMEDIA_TYPE_AUDIO) {
 440         if (!link->in_samplerates->format_count) {
 441             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 442                    " the link between filters %s and %s.\n", link->src->name,
 443                    link->dst->name);
 444             return AVERROR(EINVAL);
 445         }
 446         link->in_samplerates->format_count = 1;
 447         link->sample_rate = link->in_samplerates->formats[0];
 448
 449         if (!link->in_channel_layouts->nb_channel_layouts) {
 450             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 451                    "the link between filters %s and %s.\n", link->src->name,
 452                    link->dst->name);
 453             return AVERROR(EINVAL);
 454         }
 455         link->in_channel_layouts->nb_channel_layouts = 1;
 456         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 457     }
 458
 459     ff_formats_unref(&link->in_formats);
 460     ff_formats_unref(&link->out_formats);
 461     ff_formats_unref(&link->in_samplerates);
 462     ff_formats_unref(&link->out_samplerates);
 463     ff_channel_layouts_unref(&link->in_channel_layouts);
 464     ff_channel_layouts_unref(&link->out_channel_layouts);
 465
 466     return 0;
 467 }
 468
 469 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 470 do {                                                                   \
 471     for (i = 0; i < filter->nb_inputs; i++) {                          \
 472         AVFilterLink *link = filter->inputs[i];                        \
 473         fmt_type fmt;                                                  \
 474                                                                        \
 475         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 476             continue;                                                  \
 477         fmt = link->out_ ## list->var[0];                              \
 478                                                                        \
 479         for (j = 0; j < filter->nb_outputs; j++) {                     \
 480             AVFilterLink *out_link = filter->outputs[j];               \
 481             list_type *fmts;                                           \
 482                                                                        \
 483             if (link->type != out_link->type ||                        \
 484                 out_link->in_ ## list->nb == 1)                        \
 485                 continue;                                              \
 486             fmts = out_link->in_ ## list;                              \
 487                                                                        \
 488             if (!out_link->in_ ## list->nb) {                          \
 489                 add_format(&out_link->in_ ##list, fmt);                \
 490                 break;                                                 \
 491             }                                                          \
 492                                                                        \
 493             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 494                 if (fmts->var[k] == fmt) {                             \
 495                     fmts->var[0]  = fmt;                               \
 496                     fmts->nb = 1;                                      \
 497                     ret = 1;                                           \
 498                     break;                                             \
 499                 }                                                      \
 500         }                                                              \
 501     }                                                                  \
 502 } while (0)
 503
 504 static int reduce_formats_on_filter(AVFilterContext *filter)
 505 {
 506     int i, j, k, ret = 0;
 507
 508     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 509                    format_count, ff_add_format);
 510     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 511                    format_count, ff_add_format);
 512     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
 513                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 514
 515     return ret;
 516 }
 517
 518 static void reduce_formats(AVFilterGraph *graph)
 519 {
 520     int i, reduced;
 521
 522     do {
 523         reduced = 0;
 524
 525         for (i = 0; i < graph->filter_count; i++)
 526             reduced |= reduce_formats_on_filter(graph->filters[i]);
 527     } while (reduced);
 528 }
 529
 530 static void swap_samplerates_on_filter(AVFilterContext *filter)
 531 {
 532     AVFilterLink *link = NULL;
 533     int sample_rate;
 534     int i, j;
 535
 536     for (i = 0; i < filter->nb_inputs; i++) {
 537         link = filter->inputs[i];
 538
 539         if (link->type == AVMEDIA_TYPE_AUDIO &&
 540             link->out_samplerates->format_count == 1)
 541             break;
 542     }
 543     if (i == filter->nb_inputs)
 544         return;
 545
 546     sample_rate = link->out_samplerates->formats[0];
 547
 548     for (i = 0; i < filter->nb_outputs; i++) {
 549         AVFilterLink *outlink = filter->outputs[i];
 550         int best_idx, best_diff = INT_MAX;
 551
 552         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 553             outlink->in_samplerates->format_count < 2)
 554             continue;
 555
 556         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 557             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 558
 559             if (diff < best_diff) {
 560                 best_diff = diff;
 561                 best_idx  = j;
 562             }
 563         }
 564         FFSWAP(int, outlink->in_samplerates->formats[0],
 565                outlink->in_samplerates->formats[best_idx]);
 566     }
 567 }
 568
 569 static void swap_samplerates(AVFilterGraph *graph)
 570 {
 571     int i;
 572
 573     for (i = 0; i < graph->filter_count; i++)
 574         swap_samplerates_on_filter(graph->filters[i]);
 575 }
 576
 577 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 578 {
 579     AVFilterLink *link = NULL;
 580     uint64_t chlayout;
 581     int i, j;
 582
 583     for (i = 0; i < filter->nb_inputs; i++) {
 584         link = filter->inputs[i];
 585
 586         if (link->type == AVMEDIA_TYPE_AUDIO &&
 587             link->out_channel_layouts->nb_channel_layouts == 1)
 588             break;
 589     }
 590     if (i == filter->nb_inputs)
 591         return;
 592
 593     chlayout = link->out_channel_layouts->channel_layouts[0];
 594
 595     for (i = 0; i < filter->nb_outputs; i++) {
 596         AVFilterLink *outlink = filter->outputs[i];
 597         int best_idx, best_score = INT_MIN;
 598
 599         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 600             outlink->in_channel_layouts->nb_channel_layouts < 2)
 601             continue;
 602
 603         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 604             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 605             int matched_channels  = av_get_channel_layout_nb_channels(chlayout &
 606                                                                       out_chlayout);
 607             int extra_channels     = av_get_channel_layout_nb_channels(out_chlayout &
 608                                                                        (~chlayout));
 609             int score = matched_channels - extra_channels;
 610
 611             if (score > best_score) {
 612                 best_score = score;
 613                 best_idx   = j;
 614             }
 615         }
 616         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 617                outlink->in_channel_layouts->channel_layouts[best_idx]);
 618     }
 619
 620 }
 621
 622 static void swap_channel_layouts(AVFilterGraph *graph)
 623 {
 624     int i;
 625
 626     for (i = 0; i < graph->filter_count; i++)
 627         swap_channel_layouts_on_filter(graph->filters[i]);
 628 }
 629
 630 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 631 {
 632     AVFilterLink *link = NULL;
 633     int format, bps;
 634     int i, j;
 635
 636     for (i = 0; i < filter->nb_inputs; i++) {
 637         link = filter->inputs[i];
 638
 639         if (link->type == AVMEDIA_TYPE_AUDIO &&
 640             link->out_formats->format_count == 1)
 641             break;
 642     }
 643     if (i == filter->nb_inputs)
 644         return;
 645
 646     format = link->out_formats->formats[0];
 647     bps    = av_get_bytes_per_sample(format);
 648
 649     for (i = 0; i < filter->nb_outputs; i++) {
 650         AVFilterLink *outlink = filter->outputs[i];
 651         int best_idx, best_score = INT_MIN;
 652
 653         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 654             outlink->in_formats->format_count < 2)
 655             continue;
 656
 657         for (j = 0; j < outlink->in_formats->format_count; j++) {
 658             int out_format = outlink->in_formats->formats[j];
 659             int out_bps    = av_get_bytes_per_sample(out_format);
 660             int score;
 661
 662             if (av_get_packed_sample_fmt(out_format) == format ||
 663                 av_get_planar_sample_fmt(out_format) == format) {
 664                 best_idx   = j;
 665                 break;
 666             }
 667
 668             /* for s32 and float prefer double to prevent loss of information */
 669             if (bps == 4 && out_bps == 8) {
 670                 best_idx = j;
 671                 break;
 672             }
 673
 674             /* prefer closest higher or equal bps */
 675             score = -abs(out_bps - bps);
 676             if (out_bps >= bps)
 677                 score += INT_MAX/2;
 678
 679             if (score > best_score) {
 680                 best_score = score;
 681                 best_idx   = j;
 682             }
 683         }
 684         FFSWAP(int, outlink->in_formats->formats[0],
 685                outlink->in_formats->formats[best_idx]);
 686     }
 687 }
 688
 689 static void swap_sample_fmts(AVFilterGraph *graph)
 690 {
 691     int i;
 692
 693     for (i = 0; i < graph->filter_count; i++)
 694         swap_sample_fmts_on_filter(graph->filters[i]);
 695
 696 }
 697
 698 static int pick_formats(AVFilterGraph *graph)
 699 {
 700     int i, j, ret;
 701     int change;
 702
 703     do{
 704         change = 0;
 705         for (i = 0; i < graph->filter_count; i++) {
 706             AVFilterContext *filter = graph->filters[i];
 707             if (filter->nb_inputs){
 708                 for (j = 0; j < filter->nb_inputs; j++){
 709                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 710                         pick_format(filter->inputs[j], NULL);
 711                         change = 1;
 712                     }
 713                 }
 714             }
 715             if (filter->nb_outputs){
 716                 for (j = 0; j < filter->nb_outputs; j++){
 717                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 718                         pick_format(filter->outputs[j], NULL);
 719                         change = 1;
 720                     }
 721                 }
 722             }
 723             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 724                 for (j = 0; j < filter->nb_outputs; j++) {
 725                     if(filter->outputs[j]->format<0) {
 726                         pick_format(filter->outputs[j], filter->inputs[0]);
 727                         change = 1;
 728                     }
 729                 }
 730             }
 731         }
 732     }while(change);
 733
 734     for (i = 0; i < graph->filter_count; i++) {
 735         AVFilterContext *filter = graph->filters[i];
 736
 737         for (j = 0; j < filter->nb_inputs; j++)
 738             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 739                 return ret;
 740         for (j = 0; j < filter->nb_outputs; j++)
 741             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 742                 return ret;
 743     }
 744     return 0;
 745 }
 746
 747 /**
 748  * Configure the formats of all the links in the graph.
 749  */
 750 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 751 {
 752     int ret;
 753
 754     /* find supported formats from sub-filters, and merge along links */
 755     if ((ret = query_formats(graph, log_ctx)) < 0)
 756         return ret;
 757
 758     /* Once everything is merged, it's possible that we'll still have
 759      * multiple valid media format choices. We try to minimize the amount
 760      * of format conversion inside filters */
 761     reduce_formats(graph);
 762
 763     /* for audio filters, ensure the best format, sample rate and channel layout
 764      * is selected */
 765     swap_sample_fmts(graph);
 766     swap_samplerates(graph);
 767     swap_channel_layouts(graph);
 768
 769     if ((ret = pick_formats(graph)) < 0)
 770         return ret;
 771
 772     return 0;
 773 }
 774
 775 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 776                                              AVClass *log_ctx)
 777 {
 778     unsigned i, j;
 779     int sink_links_count = 0, n = 0;
 780     AVFilterContext *f;
 781     AVFilterLink **sinks;
 782
 783     for (i = 0; i < graph->filter_count; i++) {
 784         f = graph->filters[i];
 785         for (j = 0; j < f->nb_inputs; j++) {
 786             f->inputs[j]->graph     = graph;
 787             f->inputs[j]->age_index = -1;
 788         }
 789         for (j = 0; j < f->nb_outputs; j++) {
 790             f->outputs[j]->graph    = graph;
 791             f->outputs[j]->age_index= -1;
 792         }
 793         if (!f->nb_outputs) {
 794             if (f->nb_inputs > INT_MAX - sink_links_count)
 795                 return AVERROR(EINVAL);
 796             sink_links_count += f->nb_inputs;
 797         }
 798     }
 799     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 800     if (!sinks)
 801         return AVERROR(ENOMEM);
 802     for (i = 0; i < graph->filter_count; i++) {
 803         f = graph->filters[i];
 804         if (!f->nb_outputs) {
 805             for (j = 0; j < f->nb_inputs; j++) {
 806                 sinks[n] = f->inputs[j];
 807                 f->inputs[j]->age_index = n++;
 808             }
 809         }
 810     }
 811     av_assert0(n == sink_links_count);
 812     graph->sink_links       = sinks;
 813     graph->sink_links_count = sink_links_count;
 814     return 0;
 815 }
 816
 817 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 818 {
 819     int ret;
 820
 821     if ((ret = graph_check_validity(graphctx, log_ctx)))
 822         return ret;
 823     if ((ret = graph_config_formats(graphctx, log_ctx)))
 824         return ret;
 825     if ((ret = graph_config_links(graphctx, log_ctx)))
 826         return ret;
 827     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 828         return ret;
 829
 830     return 0;
 831 }
 832
 833 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 834 {
 835     int i, r = AVERROR(ENOSYS);
 836
 837     if(!graph)
 838         return r;
 839
 840     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 841         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 842         if(r != AVERROR(ENOSYS))
 843             return r;
 844     }
 845
 846     if(res_len && res)
 847         res[0]= 0;
 848
 849     for (i = 0; i < graph->filter_count; i++) {
 850         AVFilterContext *filter = graph->filters[i];
 851         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 852             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 853             if(r != AVERROR(ENOSYS)) {
 854                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 855                     return r;
 856             }
 857         }
 858     }
 859
 860     return r;
 861 }
 862
 863 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 864 {
 865     int i;
 866
 867     if(!graph)
 868         return 0;
 869
 870     for (i = 0; i < graph->filter_count; i++) {
 871         AVFilterContext *filter = graph->filters[i];
 872         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 873             AVFilterCommand **que = &filter->command_queue, *next;
 874             while(*que && (*que)->time <= ts)
 875                 que = &(*que)->next;
 876             next= *que;
 877             *que= av_mallocz(sizeof(AVFilterCommand));
 878             (*que)->command = av_strdup(command);
 879             (*que)->arg     = av_strdup(arg);
 880             (*que)->time    = ts;
 881             (*que)->flags   = flags;
 882             (*que)->next    = next;
 883             if(flags & AVFILTER_CMD_FLAG_ONE)
 884                 return 0;
 885         }
 886     }
 887
 888     return 0;
 889 }
 890
 891 static void heap_bubble_up(AVFilterGraph *graph,
 892                            AVFilterLink *link, int index)
 893 {
 894     AVFilterLink **links = graph->sink_links;
 895
 896     while (index) {
 897         int parent = (index - 1) >> 1;
 898         if (links[parent]->current_pts >= link->current_pts)
 899             break;
 900         links[index] = links[parent];
 901         links[index]->age_index = index;
 902         index = parent;
 903     }
 904     links[index] = link;
 905     link->age_index = index;
 906 }
 907
 908 static void heap_bubble_down(AVFilterGraph *graph,
 909                              AVFilterLink *link, int index)
 910 {
 911     AVFilterLink **links = graph->sink_links;
 912
 913     while (1) {
 914         int child = 2 * index + 1;
 915         if (child >= graph->sink_links_count)
 916             break;
 917         if (child + 1 < graph->sink_links_count &&
 918             links[child + 1]->current_pts < links[child]->current_pts)
 919             child++;
 920         if (link->current_pts < links[child]->current_pts)
 921             break;
 922         links[index] = links[child];
 923         links[index]->age_index = index;
 924         index = child;
 925     }
 926     links[index] = link;
 927     link->age_index = index;
 928 }
 929
 930 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
 931 {
 932     heap_bubble_up  (graph, link, link->age_index);
 933     heap_bubble_down(graph, link, link->age_index);
 934 }
 935
 936
 937 int avfilter_graph_request_oldest(AVFilterGraph *graph)
 938 {
 939     while (graph->sink_links_count) {
 940         AVFilterLink *oldest = graph->sink_links[0];
 941         int r = avfilter_request_frame(oldest);
 942         if (r != AVERROR_EOF)
 943             return r;
 944         /* EOF: remove the link from the heap */
 945         if (oldest->age_index < --graph->sink_links_count)
 946             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
 947                              oldest->age_index);
 948         oldest->age_index = -1;
 949     }
 950     return AVERROR_EOF;
 951 }