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_fmt_of_2()
  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/common.h"
  38 #include "libavutil/log.h"
  39
  40 static const AVClass filtergraph_class = {
  41     .class_name = "AVFilterGraph",
  42     .item_name  = av_default_item_name,
  43     .version    = LIBAVUTIL_VERSION_INT,
  44     .category   = AV_CLASS_CATEGORY_FILTER,
  45 };
  46
  47 AVFilterGraph *avfilter_graph_alloc(void)
  48 {
  49     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  50     if (!ret)
  51         return NULL;
  52     ret->av_class = &filtergraph_class;
  53     return ret;
  54 }
  55
  56 void avfilter_graph_free(AVFilterGraph **graph)
  57 {
  58     if (!*graph)
  59         return;
  60     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  61         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  62     av_freep(&(*graph)->sink_links);
  63     av_freep(&(*graph)->scale_sws_opts);
  64     av_freep(&(*graph)->filters);
  65     av_freep(graph);
  66 }
  67
  68 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  69 {
  70     AVFilterContext **filters = av_realloc(graph->filters,
  71                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  72     if (!filters)
  73         return AVERROR(ENOMEM);
  74
  75     graph->filters = filters;
  76     graph->filters[graph->filter_count++] = filter;
  77
  78     return 0;
  79 }
  80
  81 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  82                                  const char *name, const char *args, void *opaque,
  83                                  AVFilterGraph *graph_ctx)
  84 {
  85     int ret;
  86
  87     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  88         goto fail;
  89     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  90         goto fail;
  91     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  92         goto fail;
  93     return 0;
  94
  95 fail:
  96     if (*filt_ctx)
  97         avfilter_free(*filt_ctx);
  98     *filt_ctx = NULL;
  99     return ret;
 100 }
 101
 102 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 103 {
 104     graph->disable_auto_convert = flags;
 105 }
 106
 107 /**
 108  * Check for the validity of graph.
 109  *
 110  * A graph is considered valid if all its input and output pads are
 111  * connected.
 112  *
 113  * @return 0 in case of success, a negative value otherwise
 114  */
 115 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 116 {
 117     AVFilterContext *filt;
 118     int i, j;
 119
 120     for (i = 0; i < graph->filter_count; i++) {
 121         filt = graph->filters[i];
 122
 123         for (j = 0; j < filt->nb_inputs; j++) {
 124             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 125                 av_log(log_ctx, AV_LOG_ERROR,
 126                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
 127                        filt->input_pads[j].name, filt->name, filt->filter->name);
 128                 return AVERROR(EINVAL);
 129             }
 130         }
 131
 132         for (j = 0; j < filt->nb_outputs; j++) {
 133             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 134                 av_log(log_ctx, AV_LOG_ERROR,
 135                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
 136                        filt->output_pads[j].name, filt->name, filt->filter->name);
 137                 return AVERROR(EINVAL);
 138             }
 139         }
 140     }
 141
 142     return 0;
 143 }
 144
 145 /**
 146  * Configure all the links of graphctx.
 147  *
 148  * @return 0 in case of success, a negative value otherwise
 149  */
 150 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 151 {
 152     AVFilterContext *filt;
 153     int i, ret;
 154
 155     for (i=0; i < graph->filter_count; i++) {
 156         filt = graph->filters[i];
 157
 158         if (!filt->nb_outputs) {
 159             if ((ret = avfilter_config_links(filt)))
 160                 return ret;
 161         }
 162     }
 163
 164     return 0;
 165 }
 166
 167 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 168 {
 169     int i;
 170
 171     for (i = 0; i < graph->filter_count; i++)
 172         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 173             return graph->filters[i];
 174
 175     return NULL;
 176 }
 177
 178 static int filter_query_formats(AVFilterContext *ctx)
 179 {
 180     int ret;
 181     AVFilterFormats *formats;
 182     AVFilterChannelLayouts *chlayouts;
 183     AVFilterFormats *samplerates;
 184     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 185                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 186                             AVMEDIA_TYPE_VIDEO;
 187
 188     if ((ret = ctx->filter->query_formats(ctx)) < 0)
 189         return ret;
 190
 191     formats = ff_all_formats(type);
 192     if (!formats)
 193         return AVERROR(ENOMEM);
 194     ff_set_common_formats(ctx, formats);
 195     if (type == AVMEDIA_TYPE_AUDIO) {
 196         samplerates = ff_all_samplerates();
 197         if (!samplerates)
 198             return AVERROR(ENOMEM);
 199         ff_set_common_samplerates(ctx, samplerates);
 200         chlayouts = ff_all_channel_layouts();
 201         if (!chlayouts)
 202             return AVERROR(ENOMEM);
 203         ff_set_common_channel_layouts(ctx, chlayouts);
 204     }
 205     return 0;
 206 }
 207
 208 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 209                               const char *filt_name, const char *filt_args)
 210 {
 211     static int auto_count = 0, ret;
 212     char inst_name[32];
 213     AVFilterContext *filt_ctx;
 214
 215     if (graph->disable_auto_convert) {
 216         av_log(NULL, AV_LOG_ERROR,
 217                "The filters '%s' and '%s' do not have a common format "
 218                "and automatic conversion is disabled.\n",
 219                link->src->name, link->dst->name);
 220         return AVERROR(EINVAL);
 221     }
 222
 223     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 224             filt_name, auto_count++);
 225
 226     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 227                                             avfilter_get_by_name(filt_name),
 228                                             inst_name, filt_args, NULL, graph)) < 0)
 229         return ret;
 230     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 231         return ret;
 232
 233     filter_query_formats(filt_ctx);
 234
 235     if ( ((link = filt_ctx-> inputs[0]) &&
 236            !ff_merge_formats(link->in_formats, link->out_formats)) ||
 237          ((link = filt_ctx->outputs[0]) &&
 238            !ff_merge_formats(link->in_formats, link->out_formats))
 239        ) {
 240         av_log(NULL, AV_LOG_ERROR,
 241                "Impossible to convert between the formats supported by the filter "
 242                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 243         return AVERROR(EINVAL);
 244     }
 245
 246     if (link->type == AVMEDIA_TYPE_AUDIO &&
 247          (((link = filt_ctx-> inputs[0]) &&
 248            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 249          ((link = filt_ctx->outputs[0]) &&
 250            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 251        ) {
 252         av_log(NULL, AV_LOG_ERROR,
 253                "Impossible to convert between the channel layouts formats supported by the filter "
 254                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 255         return AVERROR(EINVAL);
 256     }
 257
 258     return 0;
 259 }
 260
 261 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 262 {
 263     int i, j, ret;
 264     char filt_args[128];
 265     AVFilterFormats *formats;
 266     AVFilterChannelLayouts *chlayouts;
 267     AVFilterFormats *samplerates;
 268     int scaler_count = 0, resampler_count = 0;
 269
 270     for (j = 0; j < 2; j++) {
 271     /* ask all the sub-filters for their supported media formats */
 272     for (i = 0; i < graph->filter_count; i++) {
 273         /* Call query_formats on sources first.
 274            This is a temporary workaround for amerge,
 275            until format renegociation is implemented. */
 276         if (!graph->filters[i]->nb_inputs == j)
 277             continue;
 278         if (graph->filters[i]->filter->query_formats)
 279             ret = filter_query_formats(graph->filters[i]);
 280         else
 281             ret = ff_default_query_formats(graph->filters[i]);
 282         if (ret < 0)
 283             return ret;
 284     }
 285     }
 286
 287     /* go through and merge as many format lists as possible */
 288     for (i = 0; i < graph->filter_count; i++) {
 289         AVFilterContext *filter = graph->filters[i];
 290
 291         for (j = 0; j < filter->nb_inputs; j++) {
 292             AVFilterLink *link = filter->inputs[j];
 293 #if 0
 294             if (!link) continue;
 295
 296             if (!link->in_formats || !link->out_formats)
 297                 return AVERROR(EINVAL);
 298
 299             if (link->type == AVMEDIA_TYPE_VIDEO &&
 300                 !ff_merge_formats(link->in_formats, link->out_formats)) {
 301
 302                 /* couldn't merge format lists, auto-insert scale filter */
 303                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 304                          graph->scale_sws_opts);
 305                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 306                     return ret;
 307             }
 308             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 309                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 310                     return AVERROR(EINVAL);
 311
 312                 /* Merge all three list before checking: that way, in all
 313                  * three categories, aconvert will use a common format
 314                  * whenever possible. */
 315                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
 316                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 317                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 318
 319                 if (!formats || !chlayouts || !samplerates)
 320                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 321                        return ret;
 322 #else
 323             int convert_needed = 0;
 324
 325             if (!link)
 326                 continue;
 327
 328             if (link->in_formats != link->out_formats &&
 329                 !ff_merge_formats(link->in_formats,
 330                                         link->out_formats))
 331                 convert_needed = 1;
 332             if (link->type == AVMEDIA_TYPE_AUDIO) {
 333                 if (link->in_channel_layouts != link->out_channel_layouts &&
 334                     !ff_merge_channel_layouts(link->in_channel_layouts,
 335                                               link->out_channel_layouts))
 336                     convert_needed = 1;
 337                 if (link->in_samplerates != link->out_samplerates &&
 338                     !ff_merge_samplerates(link->in_samplerates,
 339                                           link->out_samplerates))
 340                     convert_needed = 1;
 341             }
 342
 343             if (convert_needed) {
 344                 AVFilterContext *convert;
 345                 AVFilter *filter;
 346                 AVFilterLink *inlink, *outlink;
 347                 char scale_args[256];
 348                 char inst_name[30];
 349
 350                 /* couldn't merge format lists. auto-insert conversion filter */
 351                 switch (link->type) {
 352                 case AVMEDIA_TYPE_VIDEO:
 353                     if (!(filter = avfilter_get_by_name("scale"))) {
 354                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 355                                "not present, cannot convert pixel formats.\n");
 356                         return AVERROR(EINVAL);
 357                     }
 358
 359                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 360                              scaler_count++);
 361                     if (graph->scale_sws_opts)
 362                         snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 363                     else
 364                         snprintf(scale_args, sizeof(scale_args), "0:0");
 365
 366                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 367                                                             inst_name, scale_args, NULL,
 368                                                             graph)) < 0)
 369                         return ret;
 370                     break;
 371                 case AVMEDIA_TYPE_AUDIO:
 372                     if (!(filter = avfilter_get_by_name("aresample"))) {
 373                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 374                                "not present, cannot convert audio formats.\n");
 375                         return AVERROR(EINVAL);
 376                     }
 377
 378                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 379                              resampler_count++);
 380                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 381                                                             inst_name, NULL, NULL, graph)) < 0)
 382                         return ret;
 383                     break;
 384                 default:
 385                     return AVERROR(EINVAL);
 386                 }
 387
 388                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 389                     return ret;
 390
 391                 filter_query_formats(convert);
 392                 inlink  = convert->inputs[0];
 393                 outlink = convert->outputs[0];
 394                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 395                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 396                     ret |= AVERROR(ENOSYS);
 397                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 398                     (!ff_merge_samplerates(inlink->in_samplerates,
 399                                            inlink->out_samplerates) ||
 400                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 401                                                inlink->out_channel_layouts)))
 402                     ret |= AVERROR(ENOSYS);
 403                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 404                     (!ff_merge_samplerates(outlink->in_samplerates,
 405                                            outlink->out_samplerates) ||
 406                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 407                                                outlink->out_channel_layouts)))
 408                     ret |= AVERROR(ENOSYS);
 409
 410                 if (ret < 0) {
 411                     av_log(log_ctx, AV_LOG_ERROR,
 412                            "Impossible to convert between the formats supported by the filter "
 413                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 414                     return ret;
 415                 }
 416 #endif
 417             }
 418         }
 419     }
 420
 421     return 0;
 422 }
 423
 424 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 425 {
 426     if (!link || !link->in_formats)
 427         return 0;
 428
 429     if (link->type == AVMEDIA_TYPE_VIDEO) {
 430         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 431             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 432             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 433             int i;
 434             for (i=0; i<link->in_formats->format_count; i++) {
 435                 enum AVPixelFormat p = link->in_formats->formats[i];
 436                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 437             }
 438             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 439                    av_get_pix_fmt_name(best), link->in_formats->format_count,
 440                    av_get_pix_fmt_name(ref->format), has_alpha);
 441             link->in_formats->formats[0] = best;
 442         }
 443     }
 444
 445     link->in_formats->format_count = 1;
 446     link->format = link->in_formats->formats[0];
 447
 448     if (link->type == AVMEDIA_TYPE_AUDIO) {
 449         if (!link->in_samplerates->format_count) {
 450             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate 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_samplerates->format_count = 1;
 456         link->sample_rate = link->in_samplerates->formats[0];
 457
 458         if (!link->in_channel_layouts->nb_channel_layouts) {
 459             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 460                    "the link between filters %s and %s.\n", link->src->name,
 461                    link->dst->name);
 462             return AVERROR(EINVAL);
 463         }
 464         link->in_channel_layouts->nb_channel_layouts = 1;
 465         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 466     }
 467
 468     ff_formats_unref(&link->in_formats);
 469     ff_formats_unref(&link->out_formats);
 470     ff_formats_unref(&link->in_samplerates);
 471     ff_formats_unref(&link->out_samplerates);
 472     ff_channel_layouts_unref(&link->in_channel_layouts);
 473     ff_channel_layouts_unref(&link->out_channel_layouts);
 474
 475     return 0;
 476 }
 477
 478 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 479 do {                                                                   \
 480     for (i = 0; i < filter->nb_inputs; i++) {                          \
 481         AVFilterLink *link = filter->inputs[i];                        \
 482         fmt_type fmt;                                                  \
 483                                                                        \
 484         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 485             continue;                                                  \
 486         fmt = link->out_ ## list->var[0];                              \
 487                                                                        \
 488         for (j = 0; j < filter->nb_outputs; j++) {                     \
 489             AVFilterLink *out_link = filter->outputs[j];               \
 490             list_type *fmts;                                           \
 491                                                                        \
 492             if (link->type != out_link->type ||                        \
 493                 out_link->in_ ## list->nb == 1)                        \
 494                 continue;                                              \
 495             fmts = out_link->in_ ## list;                              \
 496                                                                        \
 497             if (!out_link->in_ ## list->nb) {                          \
 498                 add_format(&out_link->in_ ##list, fmt);                \
 499                 break;                                                 \
 500             }                                                          \
 501                                                                        \
 502             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 503                 if (fmts->var[k] == fmt) {                             \
 504                     fmts->var[0]  = fmt;                               \
 505                     fmts->nb = 1;                                      \
 506                     ret = 1;                                           \
 507                     break;                                             \
 508                 }                                                      \
 509         }                                                              \
 510     }                                                                  \
 511 } while (0)
 512
 513 static int reduce_formats_on_filter(AVFilterContext *filter)
 514 {
 515     int i, j, k, ret = 0;
 516
 517     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 518                    format_count, ff_add_format);
 519     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 520                    format_count, ff_add_format);
 521     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
 522                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 523
 524     return ret;
 525 }
 526
 527 static void reduce_formats(AVFilterGraph *graph)
 528 {
 529     int i, reduced;
 530
 531     do {
 532         reduced = 0;
 533
 534         for (i = 0; i < graph->filter_count; i++)
 535             reduced |= reduce_formats_on_filter(graph->filters[i]);
 536     } while (reduced);
 537 }
 538
 539 static void swap_samplerates_on_filter(AVFilterContext *filter)
 540 {
 541     AVFilterLink *link = NULL;
 542     int sample_rate;
 543     int i, j;
 544
 545     for (i = 0; i < filter->nb_inputs; i++) {
 546         link = filter->inputs[i];
 547
 548         if (link->type == AVMEDIA_TYPE_AUDIO &&
 549             link->out_samplerates->format_count == 1)
 550             break;
 551     }
 552     if (i == filter->nb_inputs)
 553         return;
 554
 555     sample_rate = link->out_samplerates->formats[0];
 556
 557     for (i = 0; i < filter->nb_outputs; i++) {
 558         AVFilterLink *outlink = filter->outputs[i];
 559         int best_idx, best_diff = INT_MAX;
 560
 561         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 562             outlink->in_samplerates->format_count < 2)
 563             continue;
 564
 565         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 566             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 567
 568             if (diff < best_diff) {
 569                 best_diff = diff;
 570                 best_idx  = j;
 571             }
 572         }
 573         FFSWAP(int, outlink->in_samplerates->formats[0],
 574                outlink->in_samplerates->formats[best_idx]);
 575     }
 576 }
 577
 578 static void swap_samplerates(AVFilterGraph *graph)
 579 {
 580     int i;
 581
 582     for (i = 0; i < graph->filter_count; i++)
 583         swap_samplerates_on_filter(graph->filters[i]);
 584 }
 585
 586 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 587 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 588 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 589 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 590 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 591 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 592 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 593
 594 /* allowable substitutions for channel pairs when comparing layouts,
 595  * ordered by priority for both values */
 596 static const uint64_t ch_subst[][2] = {
 597     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 598     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 599     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 600     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 601     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 602     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 603     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 604     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 605     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 606     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 607     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 608     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 609     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 610     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 611     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 612     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 613     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 614     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 615     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 616     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 617     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 618 };
 619
 620 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 621 {
 622     AVFilterLink *link = NULL;
 623     int i, j, k;
 624
 625     for (i = 0; i < filter->nb_inputs; i++) {
 626         link = filter->inputs[i];
 627
 628         if (link->type == AVMEDIA_TYPE_AUDIO &&
 629             link->out_channel_layouts->nb_channel_layouts == 1)
 630             break;
 631     }
 632     if (i == filter->nb_inputs)
 633         return;
 634
 635     for (i = 0; i < filter->nb_outputs; i++) {
 636         AVFilterLink *outlink = filter->outputs[i];
 637         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 638
 639         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 640             outlink->in_channel_layouts->nb_channel_layouts < 2)
 641             continue;
 642
 643         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 644             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 645             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 646             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 647             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 648             int count_diff        = out_channels - in_channels;
 649             int matched_channels, extra_channels;
 650             int score = 0;
 651
 652             /* channel substitution */
 653             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 654                 uint64_t cmp0 = ch_subst[k][0];
 655                 uint64_t cmp1 = ch_subst[k][1];
 656                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 657                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 658                     in_chlayout  &= ~cmp0;
 659                     out_chlayout &= ~cmp1;
 660                     /* add score for channel match, minus a deduction for
 661                        having to do the substitution */
 662                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 663                 }
 664             }
 665
 666             /* no penalty for LFE channel mismatch */
 667             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 668                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 669                 score += 10;
 670             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 671             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 672
 673             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 674                                                                  out_chlayout);
 675             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 676                                                                  (~in_chlayout));
 677             score += 10 * matched_channels - 5 * extra_channels;
 678
 679             if (score > best_score ||
 680                 (count_diff < best_count_diff && score == best_score)) {
 681                 best_score = score;
 682                 best_idx   = j;
 683                 best_count_diff = count_diff;
 684             }
 685         }
 686         av_assert0(best_idx >= 0);
 687         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 688                outlink->in_channel_layouts->channel_layouts[best_idx]);
 689     }
 690
 691 }
 692
 693 static void swap_channel_layouts(AVFilterGraph *graph)
 694 {
 695     int i;
 696
 697     for (i = 0; i < graph->filter_count; i++)
 698         swap_channel_layouts_on_filter(graph->filters[i]);
 699 }
 700
 701 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 702 {
 703     AVFilterLink *link = NULL;
 704     int format, bps;
 705     int i, j;
 706
 707     for (i = 0; i < filter->nb_inputs; i++) {
 708         link = filter->inputs[i];
 709
 710         if (link->type == AVMEDIA_TYPE_AUDIO &&
 711             link->out_formats->format_count == 1)
 712             break;
 713     }
 714     if (i == filter->nb_inputs)
 715         return;
 716
 717     format = link->out_formats->formats[0];
 718     bps    = av_get_bytes_per_sample(format);
 719
 720     for (i = 0; i < filter->nb_outputs; i++) {
 721         AVFilterLink *outlink = filter->outputs[i];
 722         int best_idx = -1, best_score = INT_MIN;
 723
 724         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 725             outlink->in_formats->format_count < 2)
 726             continue;
 727
 728         for (j = 0; j < outlink->in_formats->format_count; j++) {
 729             int out_format = outlink->in_formats->formats[j];
 730             int out_bps    = av_get_bytes_per_sample(out_format);
 731             int score;
 732
 733             if (av_get_packed_sample_fmt(out_format) == format ||
 734                 av_get_planar_sample_fmt(out_format) == format) {
 735                 best_idx   = j;
 736                 break;
 737             }
 738
 739             /* for s32 and float prefer double to prevent loss of information */
 740             if (bps == 4 && out_bps == 8) {
 741                 best_idx = j;
 742                 break;
 743             }
 744
 745             /* prefer closest higher or equal bps */
 746             score = -abs(out_bps - bps);
 747             if (out_bps >= bps)
 748                 score += INT_MAX/2;
 749
 750             if (score > best_score) {
 751                 best_score = score;
 752                 best_idx   = j;
 753             }
 754         }
 755         av_assert0(best_idx >= 0);
 756         FFSWAP(int, outlink->in_formats->formats[0],
 757                outlink->in_formats->formats[best_idx]);
 758     }
 759 }
 760
 761 static void swap_sample_fmts(AVFilterGraph *graph)
 762 {
 763     int i;
 764
 765     for (i = 0; i < graph->filter_count; i++)
 766         swap_sample_fmts_on_filter(graph->filters[i]);
 767
 768 }
 769
 770 static int pick_formats(AVFilterGraph *graph)
 771 {
 772     int i, j, ret;
 773     int change;
 774
 775     do{
 776         change = 0;
 777         for (i = 0; i < graph->filter_count; i++) {
 778             AVFilterContext *filter = graph->filters[i];
 779             if (filter->nb_inputs){
 780                 for (j = 0; j < filter->nb_inputs; j++){
 781                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 782                         pick_format(filter->inputs[j], NULL);
 783                         change = 1;
 784                     }
 785                 }
 786             }
 787             if (filter->nb_outputs){
 788                 for (j = 0; j < filter->nb_outputs; j++){
 789                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 790                         pick_format(filter->outputs[j], NULL);
 791                         change = 1;
 792                     }
 793                 }
 794             }
 795             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 796                 for (j = 0; j < filter->nb_outputs; j++) {
 797                     if(filter->outputs[j]->format<0) {
 798                         pick_format(filter->outputs[j], filter->inputs[0]);
 799                         change = 1;
 800                     }
 801                 }
 802             }
 803         }
 804     }while(change);
 805
 806     for (i = 0; i < graph->filter_count; i++) {
 807         AVFilterContext *filter = graph->filters[i];
 808
 809         for (j = 0; j < filter->nb_inputs; j++)
 810             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 811                 return ret;
 812         for (j = 0; j < filter->nb_outputs; j++)
 813             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 814                 return ret;
 815     }
 816     return 0;
 817 }
 818
 819 /**
 820  * Configure the formats of all the links in the graph.
 821  */
 822 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 823 {
 824     int ret;
 825
 826     /* find supported formats from sub-filters, and merge along links */
 827     if ((ret = query_formats(graph, log_ctx)) < 0)
 828         return ret;
 829
 830     /* Once everything is merged, it's possible that we'll still have
 831      * multiple valid media format choices. We try to minimize the amount
 832      * of format conversion inside filters */
 833     reduce_formats(graph);
 834
 835     /* for audio filters, ensure the best format, sample rate and channel layout
 836      * is selected */
 837     swap_sample_fmts(graph);
 838     swap_samplerates(graph);
 839     swap_channel_layouts(graph);
 840
 841     if ((ret = pick_formats(graph)) < 0)
 842         return ret;
 843
 844     return 0;
 845 }
 846
 847 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 848                                              AVClass *log_ctx)
 849 {
 850     unsigned i, j;
 851     int sink_links_count = 0, n = 0;
 852     AVFilterContext *f;
 853     AVFilterLink **sinks;
 854
 855     for (i = 0; i < graph->filter_count; i++) {
 856         f = graph->filters[i];
 857         for (j = 0; j < f->nb_inputs; j++) {
 858             f->inputs[j]->graph     = graph;
 859             f->inputs[j]->age_index = -1;
 860         }
 861         for (j = 0; j < f->nb_outputs; j++) {
 862             f->outputs[j]->graph    = graph;
 863             f->outputs[j]->age_index= -1;
 864         }
 865         if (!f->nb_outputs) {
 866             if (f->nb_inputs > INT_MAX - sink_links_count)
 867                 return AVERROR(EINVAL);
 868             sink_links_count += f->nb_inputs;
 869         }
 870     }
 871     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 872     if (!sinks)
 873         return AVERROR(ENOMEM);
 874     for (i = 0; i < graph->filter_count; i++) {
 875         f = graph->filters[i];
 876         if (!f->nb_outputs) {
 877             for (j = 0; j < f->nb_inputs; j++) {
 878                 sinks[n] = f->inputs[j];
 879                 f->inputs[j]->age_index = n++;
 880             }
 881         }
 882     }
 883     av_assert0(n == sink_links_count);
 884     graph->sink_links       = sinks;
 885     graph->sink_links_count = sink_links_count;
 886     return 0;
 887 }
 888
 889 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 890 {
 891     AVFilterContext *f;
 892     int i, j, ret;
 893     int fifo_count = 0;
 894
 895     for (i = 0; i < graph->filter_count; i++) {
 896         f = graph->filters[i];
 897
 898         for (j = 0; j < f->nb_inputs; j++) {
 899             AVFilterLink *link = f->inputs[j];
 900             AVFilterContext *fifo_ctx;
 901             AVFilter *fifo;
 902             char name[32];
 903
 904             if (!link->dstpad->needs_fifo)
 905                 continue;
 906
 907             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
 908                    avfilter_get_by_name("fifo") :
 909                    avfilter_get_by_name("afifo");
 910
 911             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
 912
 913             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
 914                                                NULL, graph);
 915             if (ret < 0)
 916                 return ret;
 917
 918             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
 919             if (ret < 0)
 920                 return ret;
 921         }
 922     }
 923
 924     return 0;
 925 }
 926
 927 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 928 {
 929     int ret;
 930
 931     if ((ret = graph_check_validity(graphctx, log_ctx)))
 932         return ret;
 933     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
 934         return ret;
 935     if ((ret = graph_config_formats(graphctx, log_ctx)))
 936         return ret;
 937     if ((ret = graph_config_links(graphctx, log_ctx)))
 938         return ret;
 939     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 940         return ret;
 941
 942     return 0;
 943 }
 944
 945 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 946 {
 947     int i, r = AVERROR(ENOSYS);
 948
 949     if(!graph)
 950         return r;
 951
 952     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 953         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 954         if(r != AVERROR(ENOSYS))
 955             return r;
 956     }
 957
 958     if(res_len && res)
 959         res[0]= 0;
 960
 961     for (i = 0; i < graph->filter_count; i++) {
 962         AVFilterContext *filter = graph->filters[i];
 963         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 964             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 965             if(r != AVERROR(ENOSYS)) {
 966                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 967                     return r;
 968             }
 969         }
 970     }
 971
 972     return r;
 973 }
 974
 975 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 976 {
 977     int i;
 978
 979     if(!graph)
 980         return 0;
 981
 982     for (i = 0; i < graph->filter_count; i++) {
 983         AVFilterContext *filter = graph->filters[i];
 984         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 985             AVFilterCommand **que = &filter->command_queue, *next;
 986             while(*que && (*que)->time <= ts)
 987                 que = &(*que)->next;
 988             next= *que;
 989             *que= av_mallocz(sizeof(AVFilterCommand));
 990             (*que)->command = av_strdup(command);
 991             (*que)->arg     = av_strdup(arg);
 992             (*que)->time    = ts;
 993             (*que)->flags   = flags;
 994             (*que)->next    = next;
 995             if(flags & AVFILTER_CMD_FLAG_ONE)
 996                 return 0;
 997         }
 998     }
 999
1000     return 0;
1001 }
1002
1003 static void heap_bubble_up(AVFilterGraph *graph,
1004                            AVFilterLink *link, int index)
1005 {
1006     AVFilterLink **links = graph->sink_links;
1007
1008     while (index) {
1009         int parent = (index - 1) >> 1;
1010         if (links[parent]->current_pts >= link->current_pts)
1011             break;
1012         links[index] = links[parent];
1013         links[index]->age_index = index;
1014         index = parent;
1015     }
1016     links[index] = link;
1017     link->age_index = index;
1018 }
1019
1020 static void heap_bubble_down(AVFilterGraph *graph,
1021                              AVFilterLink *link, int index)
1022 {
1023     AVFilterLink **links = graph->sink_links;
1024
1025     while (1) {
1026         int child = 2 * index + 1;
1027         if (child >= graph->sink_links_count)
1028             break;
1029         if (child + 1 < graph->sink_links_count &&
1030             links[child + 1]->current_pts < links[child]->current_pts)
1031             child++;
1032         if (link->current_pts < links[child]->current_pts)
1033             break;
1034         links[index] = links[child];
1035         links[index]->age_index = index;
1036         index = child;
1037     }
1038     links[index] = link;
1039     link->age_index = index;
1040 }
1041
1042 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1043 {
1044     heap_bubble_up  (graph, link, link->age_index);
1045     heap_bubble_down(graph, link, link->age_index);
1046 }
1047
1048
1049 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1050 {
1051     while (graph->sink_links_count) {
1052         AVFilterLink *oldest = graph->sink_links[0];
1053         int r = ff_request_frame(oldest);
1054         if (r != AVERROR_EOF)
1055             return r;
1056         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1057                oldest->dst ? oldest->dst->name : "unknown",
1058                oldest->dstpad ? oldest->dstpad->name : "unknown");
1059         /* EOF: remove the link from the heap */
1060         if (oldest->age_index < --graph->sink_links_count)
1061             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1062                              oldest->age_index);
1063         oldest->age_index = -1;
1064     }
1065     return AVERROR_EOF;
1066 }