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 "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt2()
  30 #include "avfilter.h"
  31 #include "avfiltergraph.h"
  32 #include "formats.h"
  33 #include "internal.h"
  34
  35 #include "libavutil/audioconvert.h"
  36 #include "libavutil/avassert.h"
  37 #include "libavutil/log.h"
  38
  39 static const AVClass filtergraph_class = {
  40     .class_name = "AVFilterGraph",
  41     .item_name  = av_default_item_name,
  42     .version    = LIBAVUTIL_VERSION_INT,
  43     .category   = AV_CLASS_CATEGORY_FILTER,
  44 };
  45
  46 AVFilterGraph *avfilter_graph_alloc(void)
  47 {
  48     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  49     if (!ret)
  50         return NULL;
  51     ret->av_class = &filtergraph_class;
  52     return ret;
  53 }
  54
  55 void avfilter_graph_free(AVFilterGraph **graph)
  56 {
  57     if (!*graph)
  58         return;
  59     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  60         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  61     av_freep(&(*graph)->sink_links);
  62     av_freep(&(*graph)->scale_sws_opts);
  63     av_freep(&(*graph)->filters);
  64     av_freep(graph);
  65 }
  66
  67 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  68 {
  69     AVFilterContext **filters = av_realloc(graph->filters,
  70                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  71     if (!filters)
  72         return AVERROR(ENOMEM);
  73
  74     graph->filters = filters;
  75     graph->filters[graph->filter_count++] = filter;
  76
  77     return 0;
  78 }
  79
  80 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  81                                  const char *name, const char *args, void *opaque,
  82                                  AVFilterGraph *graph_ctx)
  83 {
  84     int ret;
  85
  86     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  87         goto fail;
  88     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  89         goto fail;
  90     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  91         goto fail;
  92     return 0;
  93
  94 fail:
  95     if (*filt_ctx)
  96         avfilter_free(*filt_ctx);
  97     *filt_ctx = NULL;
  98     return ret;
  99 }
 100
 101 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 102 {
 103     graph->disable_auto_convert = flags;
 104 }
 105
 106 /**
 107  * Check for the validity of graph.
 108  *
 109  * A graph is considered valid if all its input and output pads are
 110  * connected.
 111  *
 112  * @return 0 in case of success, a negative value otherwise
 113  */
 114 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 115 {
 116     AVFilterContext *filt;
 117     int i, j;
 118
 119     for (i = 0; i < graph->filter_count; i++) {
 120         filt = graph->filters[i];
 121
 122         for (j = 0; j < filt->nb_inputs; j++) {
 123             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 124                 av_log(log_ctx, AV_LOG_ERROR,
 125                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
 126                        filt->input_pads[j].name, filt->name, filt->filter->name);
 127                 return AVERROR(EINVAL);
 128             }
 129         }
 130
 131         for (j = 0; j < filt->nb_outputs; j++) {
 132             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 133                 av_log(log_ctx, AV_LOG_ERROR,
 134                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
 135                        filt->output_pads[j].name, filt->name, filt->filter->name);
 136                 return AVERROR(EINVAL);
 137             }
 138         }
 139     }
 140
 141     return 0;
 142 }
 143
 144 /**
 145  * Configure all the links of graphctx.
 146  *
 147  * @return 0 in case of success, a negative value otherwise
 148  */
 149 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 150 {
 151     AVFilterContext *filt;
 152     int i, ret;
 153
 154     for (i=0; i < graph->filter_count; i++) {
 155         filt = graph->filters[i];
 156
 157         if (!filt->nb_outputs) {
 158             if ((ret = avfilter_config_links(filt)))
 159                 return ret;
 160         }
 161     }
 162
 163     return 0;
 164 }
 165
 166 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 167 {
 168     int i;
 169
 170     for (i = 0; i < graph->filter_count; i++)
 171         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 172             return graph->filters[i];
 173
 174     return NULL;
 175 }
 176
 177 static int filter_query_formats(AVFilterContext *ctx)
 178 {
 179     int ret;
 180     AVFilterFormats *formats;
 181     AVFilterChannelLayouts *chlayouts;
 182     AVFilterFormats *samplerates;
 183     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 184                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 185                             AVMEDIA_TYPE_VIDEO;
 186
 187     if ((ret = ctx->filter->query_formats(ctx)) < 0)
 188         return ret;
 189
 190     formats = ff_all_formats(type);
 191     if (!formats)
 192         return AVERROR(ENOMEM);
 193     ff_set_common_formats(ctx, formats);
 194     if (type == AVMEDIA_TYPE_AUDIO) {
 195         samplerates = ff_all_samplerates();
 196         if (!samplerates)
 197             return AVERROR(ENOMEM);
 198         ff_set_common_samplerates(ctx, samplerates);
 199         chlayouts = ff_all_channel_layouts();
 200         if (!chlayouts)
 201             return AVERROR(ENOMEM);
 202         ff_set_common_channel_layouts(ctx, chlayouts);
 203     }
 204     return 0;
 205 }
 206
 207 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 208                               const char *filt_name, const char *filt_args)
 209 {
 210     static int auto_count = 0, ret;
 211     char inst_name[32];
 212     AVFilterContext *filt_ctx;
 213
 214     if (graph->disable_auto_convert) {
 215         av_log(NULL, AV_LOG_ERROR,
 216                "The filters '%s' and '%s' do not have a common format "
 217                "and automatic conversion is disabled.\n",
 218                link->src->name, link->dst->name);
 219         return AVERROR(EINVAL);
 220     }
 221
 222     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 223             filt_name, auto_count++);
 224
 225     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 226                                             avfilter_get_by_name(filt_name),
 227                                             inst_name, filt_args, NULL, graph)) < 0)
 228         return ret;
 229     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 230         return ret;
 231
 232     filter_query_formats(filt_ctx);
 233
 234     if ( ((link = filt_ctx-> inputs[0]) &&
 235            !ff_merge_formats(link->in_formats, link->out_formats)) ||
 236          ((link = filt_ctx->outputs[0]) &&
 237            !ff_merge_formats(link->in_formats, link->out_formats))
 238        ) {
 239         av_log(NULL, AV_LOG_ERROR,
 240                "Impossible to convert between the formats supported by the filter "
 241                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 242         return AVERROR(EINVAL);
 243     }
 244
 245     if (link->type == AVMEDIA_TYPE_AUDIO &&
 246          (((link = filt_ctx-> inputs[0]) &&
 247            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 248          ((link = filt_ctx->outputs[0]) &&
 249            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 250        ) {
 251         av_log(NULL, AV_LOG_ERROR,
 252                "Impossible to convert between the channel layouts formats supported by the filter "
 253                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 254         return AVERROR(EINVAL);
 255     }
 256
 257     return 0;
 258 }
 259
 260 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 261 {
 262     int i, j, ret;
 263     char filt_args[128];
 264     AVFilterFormats *formats;
 265     AVFilterChannelLayouts *chlayouts;
 266     AVFilterFormats *samplerates;
 267     int scaler_count = 0, resampler_count = 0;
 268
 269     for (j = 0; j < 2; j++) {
 270     /* ask all the sub-filters for their supported media formats */
 271     for (i = 0; i < graph->filter_count; i++) {
 272         /* Call query_formats on sources first.
 273            This is a temporary workaround for amerge,
 274            until format renegociation is implemented. */
 275         if (!graph->filters[i]->nb_inputs == j)
 276             continue;
 277         if (graph->filters[i]->filter->query_formats)
 278             ret = filter_query_formats(graph->filters[i]);
 279         else
 280             ret = ff_default_query_formats(graph->filters[i]);
 281         if (ret < 0)
 282             return ret;
 283     }
 284     }
 285
 286     /* go through and merge as many format lists as possible */
 287     for (i = 0; i < graph->filter_count; i++) {
 288         AVFilterContext *filter = graph->filters[i];
 289
 290         for (j = 0; j < filter->nb_inputs; j++) {
 291             AVFilterLink *link = filter->inputs[j];
 292 #if 0
 293             if (!link) continue;
 294
 295             if (!link->in_formats || !link->out_formats)
 296                 return AVERROR(EINVAL);
 297
 298             if (link->type == AVMEDIA_TYPE_VIDEO &&
 299                 !ff_merge_formats(link->in_formats, link->out_formats)) {
 300
 301                 /* couldn't merge format lists, auto-insert scale filter */
 302                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 303                          graph->scale_sws_opts);
 304                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 305                     return ret;
 306             }
 307             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 308                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 309                     return AVERROR(EINVAL);
 310
 311                 /* Merge all three list before checking: that way, in all
 312                  * three categories, aconvert will use a common format
 313                  * whenever possible. */
 314                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
 315                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 316                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 317
 318                 if (!formats || !chlayouts || !samplerates)
 319                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 320                        return ret;
 321 #else
 322             int convert_needed = 0;
 323
 324             if (!link)
 325                 continue;
 326
 327             if (link->in_formats != link->out_formats &&
 328                 !ff_merge_formats(link->in_formats,
 329                                         link->out_formats))
 330                 convert_needed = 1;
 331             if (link->type == AVMEDIA_TYPE_AUDIO) {
 332                 if (link->in_channel_layouts != link->out_channel_layouts &&
 333                     !ff_merge_channel_layouts(link->in_channel_layouts,
 334                                               link->out_channel_layouts))
 335                     convert_needed = 1;
 336                 if (link->in_samplerates != link->out_samplerates &&
 337                     !ff_merge_samplerates(link->in_samplerates,
 338                                           link->out_samplerates))
 339                     convert_needed = 1;
 340             }
 341
 342             if (convert_needed) {
 343                 AVFilterContext *convert;
 344                 AVFilter *filter;
 345                 AVFilterLink *inlink, *outlink;
 346                 char scale_args[256];
 347                 char inst_name[30];
 348
 349                 /* couldn't merge format lists. auto-insert conversion filter */
 350                 switch (link->type) {
 351                 case AVMEDIA_TYPE_VIDEO:
 352                     if (!(filter = avfilter_get_by_name("scale"))) {
 353                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 354                                "not present, cannot convert pixel formats.\n");
 355                         return AVERROR(EINVAL);
 356                     }
 357
 358                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 359                              scaler_count++);
 360                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 361                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 362                                                             inst_name, scale_args, NULL,
 363                                                             graph)) < 0)
 364                         return ret;
 365                     break;
 366                 case AVMEDIA_TYPE_AUDIO:
 367                     if (!(filter = avfilter_get_by_name("aresample"))) {
 368                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 369                                "not present, cannot convert audio formats.\n");
 370                         return AVERROR(EINVAL);
 371                     }
 372
 373                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 374                              resampler_count++);
 375                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 376                                                             inst_name, NULL, NULL, graph)) < 0)
 377                         return ret;
 378                     break;
 379                 default:
 380                     return AVERROR(EINVAL);
 381                 }
 382
 383                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 384                     return ret;
 385
 386                 filter_query_formats(convert);
 387                 inlink  = convert->inputs[0];
 388                 outlink = convert->outputs[0];
 389                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 390                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 391                     ret |= AVERROR(ENOSYS);
 392                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 393                     (!ff_merge_samplerates(inlink->in_samplerates,
 394                                            inlink->out_samplerates) ||
 395                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 396                                                inlink->out_channel_layouts)))
 397                     ret |= AVERROR(ENOSYS);
 398                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 399                     (!ff_merge_samplerates(outlink->in_samplerates,
 400                                            outlink->out_samplerates) ||
 401                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 402                                                outlink->out_channel_layouts)))
 403                     ret |= AVERROR(ENOSYS);
 404
 405                 if (ret < 0) {
 406                     av_log(log_ctx, AV_LOG_ERROR,
 407                            "Impossible to convert between the formats supported by the filter "
 408                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 409                     return ret;
 410                 }
 411 #endif
 412             }
 413         }
 414     }
 415
 416     return 0;
 417 }
 418
 419 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 420 {
 421     if (!link || !link->in_formats)
 422         return 0;
 423
 424     if (link->type == AVMEDIA_TYPE_VIDEO) {
 425         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 426             int has_alpha= av_pix_fmt_descriptors[ref->format].nb_components % 2 == 0;
 427             enum PixelFormat best= PIX_FMT_NONE;
 428             int i;
 429             for (i=0; i<link->in_formats->format_count; i++) {
 430                 enum PixelFormat p = link->in_formats->formats[i];
 431                 best= avcodec_find_best_pix_fmt2(best, p, ref->format, has_alpha, NULL);
 432             }
 433             link->in_formats->formats[0] = best;
 434         }
 435     }
 436
 437     link->in_formats->format_count = 1;
 438     link->format = link->in_formats->formats[0];
 439
 440     if (link->type == AVMEDIA_TYPE_AUDIO) {
 441         if (!link->in_samplerates->format_count) {
 442             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 443                    " the link between filters %s and %s.\n", link->src->name,
 444                    link->dst->name);
 445             return AVERROR(EINVAL);
 446         }
 447         link->in_samplerates->format_count = 1;
 448         link->sample_rate = link->in_samplerates->formats[0];
 449
 450         if (!link->in_channel_layouts->nb_channel_layouts) {
 451             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 452                    "the link between filters %s and %s.\n", link->src->name,
 453                    link->dst->name);
 454             return AVERROR(EINVAL);
 455         }
 456         link->in_channel_layouts->nb_channel_layouts = 1;
 457         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 458     }
 459
 460     ff_formats_unref(&link->in_formats);
 461     ff_formats_unref(&link->out_formats);
 462     ff_formats_unref(&link->in_samplerates);
 463     ff_formats_unref(&link->out_samplerates);
 464     ff_channel_layouts_unref(&link->in_channel_layouts);
 465     ff_channel_layouts_unref(&link->out_channel_layouts);
 466
 467     return 0;
 468 }
 469
 470 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 471 do {                                                                   \
 472     for (i = 0; i < filter->nb_inputs; i++) {                          \
 473         AVFilterLink *link = filter->inputs[i];                        \
 474         fmt_type fmt;                                                  \
 475                                                                        \
 476         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 477             continue;                                                  \
 478         fmt = link->out_ ## list->var[0];                              \
 479                                                                        \
 480         for (j = 0; j < filter->nb_outputs; j++) {                     \
 481             AVFilterLink *out_link = filter->outputs[j];               \
 482             list_type *fmts;                                           \
 483                                                                        \
 484             if (link->type != out_link->type ||                        \
 485                 out_link->in_ ## list->nb == 1)                        \
 486                 continue;                                              \
 487             fmts = out_link->in_ ## list;                              \
 488                                                                        \
 489             if (!out_link->in_ ## list->nb) {                          \
 490                 add_format(&out_link->in_ ##list, fmt);                \
 491                 break;                                                 \
 492             }                                                          \
 493                                                                        \
 494             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 495                 if (fmts->var[k] == fmt) {                             \
 496                     fmts->var[0]  = fmt;                               \
 497                     fmts->nb = 1;                                      \
 498                     ret = 1;                                           \
 499                     break;                                             \
 500                 }                                                      \
 501         }                                                              \
 502     }                                                                  \
 503 } while (0)
 504
 505 static int reduce_formats_on_filter(AVFilterContext *filter)
 506 {
 507     int i, j, k, ret = 0;
 508
 509     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 510                    format_count, ff_add_format);
 511     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 512                    format_count, ff_add_format);
 513     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
 514                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 515
 516     return ret;
 517 }
 518
 519 static void reduce_formats(AVFilterGraph *graph)
 520 {
 521     int i, reduced;
 522
 523     do {
 524         reduced = 0;
 525
 526         for (i = 0; i < graph->filter_count; i++)
 527             reduced |= reduce_formats_on_filter(graph->filters[i]);
 528     } while (reduced);
 529 }
 530
 531 static void swap_samplerates_on_filter(AVFilterContext *filter)
 532 {
 533     AVFilterLink *link = NULL;
 534     int sample_rate;
 535     int i, j;
 536
 537     for (i = 0; i < filter->nb_inputs; i++) {
 538         link = filter->inputs[i];
 539
 540         if (link->type == AVMEDIA_TYPE_AUDIO &&
 541             link->out_samplerates->format_count == 1)
 542             break;
 543     }
 544     if (i == filter->nb_inputs)
 545         return;
 546
 547     sample_rate = link->out_samplerates->formats[0];
 548
 549     for (i = 0; i < filter->nb_outputs; i++) {
 550         AVFilterLink *outlink = filter->outputs[i];
 551         int best_idx, best_diff = INT_MAX;
 552
 553         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 554             outlink->in_samplerates->format_count < 2)
 555             continue;
 556
 557         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 558             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 559
 560             if (diff < best_diff) {
 561                 best_diff = diff;
 562                 best_idx  = j;
 563             }
 564         }
 565         FFSWAP(int, outlink->in_samplerates->formats[0],
 566                outlink->in_samplerates->formats[best_idx]);
 567     }
 568 }
 569
 570 static void swap_samplerates(AVFilterGraph *graph)
 571 {
 572     int i;
 573
 574     for (i = 0; i < graph->filter_count; i++)
 575         swap_samplerates_on_filter(graph->filters[i]);
 576 }
 577
 578 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 579 {
 580     AVFilterLink *link = NULL;
 581     uint64_t chlayout;
 582     int i, j;
 583
 584     for (i = 0; i < filter->nb_inputs; i++) {
 585         link = filter->inputs[i];
 586
 587         if (link->type == AVMEDIA_TYPE_AUDIO &&
 588             link->out_channel_layouts->nb_channel_layouts == 1)
 589             break;
 590     }
 591     if (i == filter->nb_inputs)
 592         return;
 593
 594     chlayout = link->out_channel_layouts->channel_layouts[0];
 595
 596     for (i = 0; i < filter->nb_outputs; i++) {
 597         AVFilterLink *outlink = filter->outputs[i];
 598         int best_idx, best_score = INT_MIN;
 599
 600         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 601             outlink->in_channel_layouts->nb_channel_layouts < 2)
 602             continue;
 603
 604         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 605             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 606             int matched_channels  = av_get_channel_layout_nb_channels(chlayout &
 607                                                                       out_chlayout);
 608             int extra_channels     = av_get_channel_layout_nb_channels(out_chlayout &
 609                                                                        (~chlayout));
 610             int score = matched_channels - extra_channels;
 611
 612             if (score > best_score) {
 613                 best_score = score;
 614                 best_idx   = j;
 615             }
 616         }
 617         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 618                outlink->in_channel_layouts->channel_layouts[best_idx]);
 619     }
 620
 621 }
 622
 623 static void swap_channel_layouts(AVFilterGraph *graph)
 624 {
 625     int i;
 626
 627     for (i = 0; i < graph->filter_count; i++)
 628         swap_channel_layouts_on_filter(graph->filters[i]);
 629 }
 630
 631 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 632 {
 633     AVFilterLink *link = NULL;
 634     int format, bps;
 635     int i, j;
 636
 637     for (i = 0; i < filter->nb_inputs; i++) {
 638         link = filter->inputs[i];
 639
 640         if (link->type == AVMEDIA_TYPE_AUDIO &&
 641             link->out_formats->format_count == 1)
 642             break;
 643     }
 644     if (i == filter->nb_inputs)
 645         return;
 646
 647     format = link->out_formats->formats[0];
 648     bps    = av_get_bytes_per_sample(format);
 649
 650     for (i = 0; i < filter->nb_outputs; i++) {
 651         AVFilterLink *outlink = filter->outputs[i];
 652         int best_idx = -1, best_score = INT_MIN;
 653
 654         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 655             outlink->in_formats->format_count < 2)
 656             continue;
 657
 658         for (j = 0; j < outlink->in_formats->format_count; j++) {
 659             int out_format = outlink->in_formats->formats[j];
 660             int out_bps    = av_get_bytes_per_sample(out_format);
 661             int score;
 662
 663             if (av_get_packed_sample_fmt(out_format) == format ||
 664                 av_get_planar_sample_fmt(out_format) == format) {
 665                 best_idx   = j;
 666                 break;
 667             }
 668
 669             /* for s32 and float prefer double to prevent loss of information */
 670             if (bps == 4 && out_bps == 8) {
 671                 best_idx = j;
 672                 break;
 673             }
 674
 675             /* prefer closest higher or equal bps */
 676             score = -abs(out_bps - bps);
 677             if (out_bps >= bps)
 678                 score += INT_MAX/2;
 679
 680             if (score > best_score) {
 681                 best_score = score;
 682                 best_idx   = j;
 683             }
 684         }
 685         av_assert0(best_idx >= 0);
 686         FFSWAP(int, outlink->in_formats->formats[0],
 687                outlink->in_formats->formats[best_idx]);
 688     }
 689 }
 690
 691 static void swap_sample_fmts(AVFilterGraph *graph)
 692 {
 693     int i;
 694
 695     for (i = 0; i < graph->filter_count; i++)
 696         swap_sample_fmts_on_filter(graph->filters[i]);
 697
 698 }
 699
 700 static int pick_formats(AVFilterGraph *graph)
 701 {
 702     int i, j, ret;
 703     int change;
 704
 705     do{
 706         change = 0;
 707         for (i = 0; i < graph->filter_count; i++) {
 708             AVFilterContext *filter = graph->filters[i];
 709             if (filter->nb_inputs){
 710                 for (j = 0; j < filter->nb_inputs; j++){
 711                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 712                         pick_format(filter->inputs[j], NULL);
 713                         change = 1;
 714                     }
 715                 }
 716             }
 717             if (filter->nb_outputs){
 718                 for (j = 0; j < filter->nb_outputs; j++){
 719                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 720                         pick_format(filter->outputs[j], NULL);
 721                         change = 1;
 722                     }
 723                 }
 724             }
 725             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 726                 for (j = 0; j < filter->nb_outputs; j++) {
 727                     if(filter->outputs[j]->format<0) {
 728                         pick_format(filter->outputs[j], filter->inputs[0]);
 729                         change = 1;
 730                     }
 731                 }
 732             }
 733         }
 734     }while(change);
 735
 736     for (i = 0; i < graph->filter_count; i++) {
 737         AVFilterContext *filter = graph->filters[i];
 738
 739         for (j = 0; j < filter->nb_inputs; j++)
 740             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 741                 return ret;
 742         for (j = 0; j < filter->nb_outputs; j++)
 743             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 744                 return ret;
 745     }
 746     return 0;
 747 }
 748
 749 /**
 750  * Configure the formats of all the links in the graph.
 751  */
 752 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 753 {
 754     int ret;
 755
 756     /* find supported formats from sub-filters, and merge along links */
 757     if ((ret = query_formats(graph, log_ctx)) < 0)
 758         return ret;
 759
 760     /* Once everything is merged, it's possible that we'll still have
 761      * multiple valid media format choices. We try to minimize the amount
 762      * of format conversion inside filters */
 763     reduce_formats(graph);
 764
 765     /* for audio filters, ensure the best format, sample rate and channel layout
 766      * is selected */
 767     swap_sample_fmts(graph);
 768     swap_samplerates(graph);
 769     swap_channel_layouts(graph);
 770
 771     if ((ret = pick_formats(graph)) < 0)
 772         return ret;
 773
 774     return 0;
 775 }
 776
 777 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 778                                              AVClass *log_ctx)
 779 {
 780     unsigned i, j;
 781     int sink_links_count = 0, n = 0;
 782     AVFilterContext *f;
 783     AVFilterLink **sinks;
 784
 785     for (i = 0; i < graph->filter_count; i++) {
 786         f = graph->filters[i];
 787         for (j = 0; j < f->nb_inputs; j++) {
 788             f->inputs[j]->graph     = graph;
 789             f->inputs[j]->age_index = -1;
 790         }
 791         for (j = 0; j < f->nb_outputs; j++) {
 792             f->outputs[j]->graph    = graph;
 793             f->outputs[j]->age_index= -1;
 794         }
 795         if (!f->nb_outputs) {
 796             if (f->nb_inputs > INT_MAX - sink_links_count)
 797                 return AVERROR(EINVAL);
 798             sink_links_count += f->nb_inputs;
 799         }
 800     }
 801     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 802     if (!sinks)
 803         return AVERROR(ENOMEM);
 804     for (i = 0; i < graph->filter_count; i++) {
 805         f = graph->filters[i];
 806         if (!f->nb_outputs) {
 807             for (j = 0; j < f->nb_inputs; j++) {
 808                 sinks[n] = f->inputs[j];
 809                 f->inputs[j]->age_index = n++;
 810             }
 811         }
 812     }
 813     av_assert0(n == sink_links_count);
 814     graph->sink_links       = sinks;
 815     graph->sink_links_count = sink_links_count;
 816     return 0;
 817 }
 818
 819 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 820 {
 821     AVFilterContext *f;
 822     int i, j, ret;
 823     int fifo_count = 0;
 824
 825     for (i = 0; i < graph->filter_count; i++) {
 826         f = graph->filters[i];
 827
 828         for (j = 0; j < f->nb_inputs; j++) {
 829             AVFilterLink *link = f->inputs[j];
 830             AVFilterContext *fifo_ctx;
 831             AVFilter *fifo;
 832             char name[32];
 833
 834             if (!link->dstpad->needs_fifo)
 835                 continue;
 836
 837             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
 838                    avfilter_get_by_name("fifo") :
 839                    avfilter_get_by_name("afifo");
 840
 841             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
 842
 843             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
 844                                                NULL, graph);
 845             if (ret < 0)
 846                 return ret;
 847
 848             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
 849             if (ret < 0)
 850                 return ret;
 851         }
 852     }
 853
 854     return 0;
 855 }
 856
 857 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 858 {
 859     int ret;
 860
 861     if ((ret = graph_check_validity(graphctx, log_ctx)))
 862         return ret;
 863     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
 864         return ret;
 865     if ((ret = graph_config_formats(graphctx, log_ctx)))
 866         return ret;
 867     if ((ret = graph_config_links(graphctx, log_ctx)))
 868         return ret;
 869     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 870         return ret;
 871
 872     return 0;
 873 }
 874
 875 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 876 {
 877     int i, r = AVERROR(ENOSYS);
 878
 879     if(!graph)
 880         return r;
 881
 882     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 883         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 884         if(r != AVERROR(ENOSYS))
 885             return r;
 886     }
 887
 888     if(res_len && res)
 889         res[0]= 0;
 890
 891     for (i = 0; i < graph->filter_count; i++) {
 892         AVFilterContext *filter = graph->filters[i];
 893         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 894             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 895             if(r != AVERROR(ENOSYS)) {
 896                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 897                     return r;
 898             }
 899         }
 900     }
 901
 902     return r;
 903 }
 904
 905 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 906 {
 907     int i;
 908
 909     if(!graph)
 910         return 0;
 911
 912     for (i = 0; i < graph->filter_count; i++) {
 913         AVFilterContext *filter = graph->filters[i];
 914         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 915             AVFilterCommand **que = &filter->command_queue, *next;
 916             while(*que && (*que)->time <= ts)
 917                 que = &(*que)->next;
 918             next= *que;
 919             *que= av_mallocz(sizeof(AVFilterCommand));
 920             (*que)->command = av_strdup(command);
 921             (*que)->arg     = av_strdup(arg);
 922             (*que)->time    = ts;
 923             (*que)->flags   = flags;
 924             (*que)->next    = next;
 925             if(flags & AVFILTER_CMD_FLAG_ONE)
 926                 return 0;
 927         }
 928     }
 929
 930     return 0;
 931 }
 932
 933 static void heap_bubble_up(AVFilterGraph *graph,
 934                            AVFilterLink *link, int index)
 935 {
 936     AVFilterLink **links = graph->sink_links;
 937
 938     while (index) {
 939         int parent = (index - 1) >> 1;
 940         if (links[parent]->current_pts >= link->current_pts)
 941             break;
 942         links[index] = links[parent];
 943         links[index]->age_index = index;
 944         index = parent;
 945     }
 946     links[index] = link;
 947     link->age_index = index;
 948 }
 949
 950 static void heap_bubble_down(AVFilterGraph *graph,
 951                              AVFilterLink *link, int index)
 952 {
 953     AVFilterLink **links = graph->sink_links;
 954
 955     while (1) {
 956         int child = 2 * index + 1;
 957         if (child >= graph->sink_links_count)
 958             break;
 959         if (child + 1 < graph->sink_links_count &&
 960             links[child + 1]->current_pts < links[child]->current_pts)
 961             child++;
 962         if (link->current_pts < links[child]->current_pts)
 963             break;
 964         links[index] = links[child];
 965         links[index]->age_index = index;
 966         index = child;
 967     }
 968     links[index] = link;
 969     link->age_index = index;
 970 }
 971
 972 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
 973 {
 974     heap_bubble_up  (graph, link, link->age_index);
 975     heap_bubble_down(graph, link, link->age_index);
 976 }
 977
 978
 979 int avfilter_graph_request_oldest(AVFilterGraph *graph)
 980 {
 981     while (graph->sink_links_count) {
 982         AVFilterLink *oldest = graph->sink_links[0];
 983         int r = ff_request_frame(oldest);
 984         if (r != AVERROR_EOF)
 985             return r;
 986         /* EOF: remove the link from the heap */
 987         if (oldest->age_index < --graph->sink_links_count)
 988             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
 989                              oldest->age_index);
 990         oldest->age_index = -1;
 991     }
 992     return AVERROR_EOF;
 993 }