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/avassert.h"
  27 #include "libavutil/channel_layout.h"
  28 #include "libavutil/opt.h"
  29 #include "libavutil/pixdesc.h"
  30 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
  31 #include "avfilter.h"
  32 #include "avfiltergraph.h"
  33 #include "formats.h"
  34 #include "internal.h"
  35
  36 #define OFFSET(x) offsetof(AVFilterGraph,x)
  37
  38 static const AVOption options[]={
  39 {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
  40 {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
  41 {0}
  42 };
  43
  44
  45 static const AVClass filtergraph_class = {
  46     .class_name = "AVFilterGraph",
  47     .item_name  = av_default_item_name,
  48     .option     = options,
  49     .version    = LIBAVUTIL_VERSION_INT,
  50     .category   = AV_CLASS_CATEGORY_FILTER,
  51 };
  52
  53 AVFilterGraph *avfilter_graph_alloc(void)
  54 {
  55     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  56     if (!ret)
  57         return NULL;
  58     ret->av_class = &filtergraph_class;
  59     return ret;
  60 }
  61
  62 void avfilter_graph_free(AVFilterGraph **graph)
  63 {
  64     if (!*graph)
  65         return;
  66     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  67         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  68     av_freep(&(*graph)->sink_links);
  69     av_freep(&(*graph)->scale_sws_opts);
  70     av_freep(&(*graph)->aresample_swr_opts);
  71     av_freep(&(*graph)->filters);
  72     av_freep(graph);
  73 }
  74
  75 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  76 {
  77     AVFilterContext **filters = av_realloc(graph->filters,
  78                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  79     if (!filters)
  80         return AVERROR(ENOMEM);
  81
  82     graph->filters = filters;
  83     graph->filters[graph->filter_count++] = filter;
  84
  85     return 0;
  86 }
  87
  88 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  89                                  const char *name, const char *args, void *opaque,
  90                                  AVFilterGraph *graph_ctx)
  91 {
  92     int ret;
  93
  94     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  95         goto fail;
  96     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  97         goto fail;
  98     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  99         goto fail;
 100     return 0;
 101
 102 fail:
 103     if (*filt_ctx)
 104         avfilter_free(*filt_ctx);
 105     *filt_ctx = NULL;
 106     return ret;
 107 }
 108
 109 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 110 {
 111     graph->disable_auto_convert = flags;
 112 }
 113
 114 /**
 115  * Check for the validity of graph.
 116  *
 117  * A graph is considered valid if all its input and output pads are
 118  * connected.
 119  *
 120  * @return 0 in case of success, a negative value otherwise
 121  */
 122 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 123 {
 124     AVFilterContext *filt;
 125     int i, j;
 126
 127     for (i = 0; i < graph->filter_count; i++) {
 128         const AVFilterPad *pad;
 129         filt = graph->filters[i];
 130
 131         for (j = 0; j < filt->nb_inputs; j++) {
 132             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 133                 pad = &filt->input_pads[j];
 134                 av_log(log_ctx, AV_LOG_ERROR,
 135                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 136                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 137                 return AVERROR(EINVAL);
 138             }
 139         }
 140
 141         for (j = 0; j < filt->nb_outputs; j++) {
 142             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 143                 pad = &filt->output_pads[j];
 144                 av_log(log_ctx, AV_LOG_ERROR,
 145                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 146                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 147                 return AVERROR(EINVAL);
 148             }
 149         }
 150     }
 151
 152     return 0;
 153 }
 154
 155 /**
 156  * Configure all the links of graphctx.
 157  *
 158  * @return 0 in case of success, a negative value otherwise
 159  */
 160 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 161 {
 162     AVFilterContext *filt;
 163     int i, ret;
 164
 165     for (i=0; i < graph->filter_count; i++) {
 166         filt = graph->filters[i];
 167
 168         if (!filt->nb_outputs) {
 169             if ((ret = avfilter_config_links(filt)))
 170                 return ret;
 171         }
 172     }
 173
 174     return 0;
 175 }
 176
 177 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 178 {
 179     int i;
 180
 181     for (i = 0; i < graph->filter_count; i++)
 182         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 183             return graph->filters[i];
 184
 185     return NULL;
 186 }
 187
 188 static int filter_query_formats(AVFilterContext *ctx)
 189 {
 190     int ret;
 191     AVFilterFormats *formats;
 192     AVFilterChannelLayouts *chlayouts;
 193     AVFilterFormats *samplerates;
 194     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 195                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 196                             AVMEDIA_TYPE_VIDEO;
 197
 198     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 199         av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 200                ctx->name, av_err2str(ret));
 201         return ret;
 202     }
 203
 204     formats = ff_all_formats(type);
 205     if (!formats)
 206         return AVERROR(ENOMEM);
 207     ff_set_common_formats(ctx, formats);
 208     if (type == AVMEDIA_TYPE_AUDIO) {
 209         samplerates = ff_all_samplerates();
 210         if (!samplerates)
 211             return AVERROR(ENOMEM);
 212         ff_set_common_samplerates(ctx, samplerates);
 213         chlayouts = ff_all_channel_layouts();
 214         if (!chlayouts)
 215             return AVERROR(ENOMEM);
 216         ff_set_common_channel_layouts(ctx, chlayouts);
 217     }
 218     return 0;
 219 }
 220
 221 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 222                               const char *filt_name, const char *filt_args)
 223 {
 224     static int auto_count = 0, ret;
 225     char inst_name[32];
 226     AVFilterContext *filt_ctx;
 227
 228     if (graph->disable_auto_convert) {
 229         av_log(NULL, AV_LOG_ERROR,
 230                "The filters '%s' and '%s' do not have a common format "
 231                "and automatic conversion is disabled.\n",
 232                link->src->name, link->dst->name);
 233         return AVERROR(EINVAL);
 234     }
 235
 236     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 237             filt_name, auto_count++);
 238
 239     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 240                                             avfilter_get_by_name(filt_name),
 241                                             inst_name, filt_args, NULL, graph)) < 0)
 242         return ret;
 243     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 244         return ret;
 245
 246     filter_query_formats(filt_ctx);
 247
 248     if ( ((link = filt_ctx-> inputs[0]) &&
 249            !ff_merge_formats(link->in_formats, link->out_formats)) ||
 250          ((link = filt_ctx->outputs[0]) &&
 251            !ff_merge_formats(link->in_formats, link->out_formats))
 252        ) {
 253         av_log(NULL, AV_LOG_ERROR,
 254                "Impossible to convert between the formats supported by the filter "
 255                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 256         return AVERROR(EINVAL);
 257     }
 258
 259     if (link->type == AVMEDIA_TYPE_AUDIO &&
 260          (((link = filt_ctx-> inputs[0]) &&
 261            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 262          ((link = filt_ctx->outputs[0]) &&
 263            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 264        ) {
 265         av_log(NULL, AV_LOG_ERROR,
 266                "Impossible to convert between the channel layouts formats supported by the filter "
 267                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 268         return AVERROR(EINVAL);
 269     }
 270
 271     return 0;
 272 }
 273
 274 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 275 {
 276     int i, j, ret;
 277 #if 0
 278     char filt_args[128];
 279     AVFilterFormats *formats;
 280     AVFilterChannelLayouts *chlayouts;
 281     AVFilterFormats *samplerates;
 282 #endif
 283     int scaler_count = 0, resampler_count = 0;
 284
 285     for (j = 0; j < 2; j++) {
 286     /* ask all the sub-filters for their supported media formats */
 287     for (i = 0; i < graph->filter_count; i++) {
 288         /* Call query_formats on sources first.
 289            This is a temporary workaround for amerge,
 290            until format renegociation is implemented. */
 291         if (!graph->filters[i]->nb_inputs == j)
 292             continue;
 293         if (graph->filters[i]->filter->query_formats)
 294             ret = filter_query_formats(graph->filters[i]);
 295         else
 296             ret = ff_default_query_formats(graph->filters[i]);
 297         if (ret < 0)
 298             return ret;
 299     }
 300     }
 301
 302     /* go through and merge as many format lists as possible */
 303     for (i = 0; i < graph->filter_count; i++) {
 304         AVFilterContext *filter = graph->filters[i];
 305
 306         for (j = 0; j < filter->nb_inputs; j++) {
 307             AVFilterLink *link = filter->inputs[j];
 308 #if 0
 309             if (!link) continue;
 310
 311             if (!link->in_formats || !link->out_formats)
 312                 return AVERROR(EINVAL);
 313
 314             if (link->type == AVMEDIA_TYPE_VIDEO &&
 315                 !ff_merge_formats(link->in_formats, link->out_formats)) {
 316
 317                 /* couldn't merge format lists, auto-insert scale filter */
 318                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 319                          graph->scale_sws_opts);
 320                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 321                     return ret;
 322             }
 323             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 324                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 325                     return AVERROR(EINVAL);
 326
 327                 /* Merge all three list before checking: that way, in all
 328                  * three categories, aconvert will use a common format
 329                  * whenever possible. */
 330                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
 331                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 332                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 333
 334                 if (!formats || !chlayouts || !samplerates)
 335                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 336                        return ret;
 337 #else
 338             int convert_needed = 0;
 339
 340             if (!link)
 341                 continue;
 342
 343             if (link->in_formats != link->out_formats &&
 344                 !ff_merge_formats(link->in_formats,
 345                                         link->out_formats))
 346                 convert_needed = 1;
 347             if (link->type == AVMEDIA_TYPE_AUDIO) {
 348                 if (link->in_channel_layouts != link->out_channel_layouts &&
 349                     !ff_merge_channel_layouts(link->in_channel_layouts,
 350                                               link->out_channel_layouts))
 351                     convert_needed = 1;
 352                 if (link->in_samplerates != link->out_samplerates &&
 353                     !ff_merge_samplerates(link->in_samplerates,
 354                                           link->out_samplerates))
 355                     convert_needed = 1;
 356             }
 357
 358             if (convert_needed) {
 359                 AVFilterContext *convert;
 360                 AVFilter *filter;
 361                 AVFilterLink *inlink, *outlink;
 362                 char scale_args[256];
 363                 char inst_name[30];
 364
 365                 /* couldn't merge format lists. auto-insert conversion filter */
 366                 switch (link->type) {
 367                 case AVMEDIA_TYPE_VIDEO:
 368                     if (!(filter = avfilter_get_by_name("scale"))) {
 369                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 370                                "not present, cannot convert pixel formats.\n");
 371                         return AVERROR(EINVAL);
 372                     }
 373
 374                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 375                              scaler_count++);
 376                     if (graph->scale_sws_opts)
 377                         snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 378                     else
 379                         snprintf(scale_args, sizeof(scale_args), "0:0");
 380
 381                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 382                                                             inst_name, scale_args, NULL,
 383                                                             graph)) < 0)
 384                         return ret;
 385                     break;
 386                 case AVMEDIA_TYPE_AUDIO:
 387                     if (!(filter = avfilter_get_by_name("aresample"))) {
 388                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 389                                "not present, cannot convert audio formats.\n");
 390                         return AVERROR(EINVAL);
 391                     }
 392
 393                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 394                              resampler_count++);
 395                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 396                                                             inst_name, graph->aresample_swr_opts, NULL, graph)) < 0)
 397                         return ret;
 398                     break;
 399                 default:
 400                     return AVERROR(EINVAL);
 401                 }
 402
 403                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 404                     return ret;
 405
 406                 filter_query_formats(convert);
 407                 inlink  = convert->inputs[0];
 408                 outlink = convert->outputs[0];
 409                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 410                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 411                     ret |= AVERROR(ENOSYS);
 412                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 413                     (!ff_merge_samplerates(inlink->in_samplerates,
 414                                            inlink->out_samplerates) ||
 415                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 416                                                inlink->out_channel_layouts)))
 417                     ret |= AVERROR(ENOSYS);
 418                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 419                     (!ff_merge_samplerates(outlink->in_samplerates,
 420                                            outlink->out_samplerates) ||
 421                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 422                                                outlink->out_channel_layouts)))
 423                     ret |= AVERROR(ENOSYS);
 424
 425                 if (ret < 0) {
 426                     av_log(log_ctx, AV_LOG_ERROR,
 427                            "Impossible to convert between the formats supported by the filter "
 428                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 429                     return ret;
 430                 }
 431 #endif
 432             }
 433         }
 434     }
 435
 436     return 0;
 437 }
 438
 439 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 440 {
 441     if (!link || !link->in_formats)
 442         return 0;
 443
 444     if (link->type == AVMEDIA_TYPE_VIDEO) {
 445         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 446             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 447             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 448             int i;
 449             for (i=0; i<link->in_formats->format_count; i++) {
 450                 enum AVPixelFormat p = link->in_formats->formats[i];
 451                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 452             }
 453             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 454                    av_get_pix_fmt_name(best), link->in_formats->format_count,
 455                    av_get_pix_fmt_name(ref->format), has_alpha);
 456             link->in_formats->formats[0] = best;
 457         }
 458     }
 459
 460     link->in_formats->format_count = 1;
 461     link->format = link->in_formats->formats[0];
 462
 463     if (link->type == AVMEDIA_TYPE_AUDIO) {
 464         if (!link->in_samplerates->format_count) {
 465             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 466                    " the link between filters %s and %s.\n", link->src->name,
 467                    link->dst->name);
 468             return AVERROR(EINVAL);
 469         }
 470         link->in_samplerates->format_count = 1;
 471         link->sample_rate = link->in_samplerates->formats[0];
 472
 473         if (!link->in_channel_layouts->nb_channel_layouts) {
 474             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 475                    "the link between filters %s and %s.\n", link->src->name,
 476                    link->dst->name);
 477             return AVERROR(EINVAL);
 478         }
 479         link->in_channel_layouts->nb_channel_layouts = 1;
 480         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 481         link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 482     }
 483
 484     ff_formats_unref(&link->in_formats);
 485     ff_formats_unref(&link->out_formats);
 486     ff_formats_unref(&link->in_samplerates);
 487     ff_formats_unref(&link->out_samplerates);
 488     ff_channel_layouts_unref(&link->in_channel_layouts);
 489     ff_channel_layouts_unref(&link->out_channel_layouts);
 490
 491     return 0;
 492 }
 493
 494 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 495 do {                                                                   \
 496     for (i = 0; i < filter->nb_inputs; i++) {                          \
 497         AVFilterLink *link = filter->inputs[i];                        \
 498         fmt_type fmt;                                                  \
 499                                                                        \
 500         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 501             continue;                                                  \
 502         fmt = link->out_ ## list->var[0];                              \
 503                                                                        \
 504         for (j = 0; j < filter->nb_outputs; j++) {                     \
 505             AVFilterLink *out_link = filter->outputs[j];               \
 506             list_type *fmts;                                           \
 507                                                                        \
 508             if (link->type != out_link->type ||                        \
 509                 out_link->in_ ## list->nb == 1)                        \
 510                 continue;                                              \
 511             fmts = out_link->in_ ## list;                              \
 512                                                                        \
 513             if (!out_link->in_ ## list->nb) {                          \
 514                 add_format(&out_link->in_ ##list, fmt);                \
 515                 break;                                                 \
 516             }                                                          \
 517                                                                        \
 518             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 519                 if (fmts->var[k] == fmt) {                             \
 520                     fmts->var[0]  = fmt;                               \
 521                     fmts->nb = 1;                                      \
 522                     ret = 1;                                           \
 523                     break;                                             \
 524                 }                                                      \
 525         }                                                              \
 526     }                                                                  \
 527 } while (0)
 528
 529 static int reduce_formats_on_filter(AVFilterContext *filter)
 530 {
 531     int i, j, k, ret = 0;
 532
 533     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 534                    format_count, ff_add_format);
 535     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 536                    format_count, ff_add_format);
 537     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
 538                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 539
 540     return ret;
 541 }
 542
 543 static void reduce_formats(AVFilterGraph *graph)
 544 {
 545     int i, reduced;
 546
 547     do {
 548         reduced = 0;
 549
 550         for (i = 0; i < graph->filter_count; i++)
 551             reduced |= reduce_formats_on_filter(graph->filters[i]);
 552     } while (reduced);
 553 }
 554
 555 static void swap_samplerates_on_filter(AVFilterContext *filter)
 556 {
 557     AVFilterLink *link = NULL;
 558     int sample_rate;
 559     int i, j;
 560
 561     for (i = 0; i < filter->nb_inputs; i++) {
 562         link = filter->inputs[i];
 563
 564         if (link->type == AVMEDIA_TYPE_AUDIO &&
 565             link->out_samplerates->format_count == 1)
 566             break;
 567     }
 568     if (i == filter->nb_inputs)
 569         return;
 570
 571     sample_rate = link->out_samplerates->formats[0];
 572
 573     for (i = 0; i < filter->nb_outputs; i++) {
 574         AVFilterLink *outlink = filter->outputs[i];
 575         int best_idx, best_diff = INT_MAX;
 576
 577         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 578             outlink->in_samplerates->format_count < 2)
 579             continue;
 580
 581         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 582             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 583
 584             if (diff < best_diff) {
 585                 best_diff = diff;
 586                 best_idx  = j;
 587             }
 588         }
 589         FFSWAP(int, outlink->in_samplerates->formats[0],
 590                outlink->in_samplerates->formats[best_idx]);
 591     }
 592 }
 593
 594 static void swap_samplerates(AVFilterGraph *graph)
 595 {
 596     int i;
 597
 598     for (i = 0; i < graph->filter_count; i++)
 599         swap_samplerates_on_filter(graph->filters[i]);
 600 }
 601
 602 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 603 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 604 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 605 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 606 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 607 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 608 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 609
 610 /* allowable substitutions for channel pairs when comparing layouts,
 611  * ordered by priority for both values */
 612 static const uint64_t ch_subst[][2] = {
 613     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 614     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 615     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 616     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 617     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 618     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 619     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 620     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 621     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 622     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 623     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 624     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 625     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 626     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 627     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 628     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 629     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 630     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 631     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 632     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 633     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 634 };
 635
 636 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 637 {
 638     AVFilterLink *link = NULL;
 639     int i, j, k;
 640
 641     for (i = 0; i < filter->nb_inputs; i++) {
 642         link = filter->inputs[i];
 643
 644         if (link->type == AVMEDIA_TYPE_AUDIO &&
 645             link->out_channel_layouts->nb_channel_layouts == 1)
 646             break;
 647     }
 648     if (i == filter->nb_inputs)
 649         return;
 650
 651     for (i = 0; i < filter->nb_outputs; i++) {
 652         AVFilterLink *outlink = filter->outputs[i];
 653         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 654
 655         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 656             outlink->in_channel_layouts->nb_channel_layouts < 2)
 657             continue;
 658
 659         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 660             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 661             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 662             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 663             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 664             int count_diff        = out_channels - in_channels;
 665             int matched_channels, extra_channels;
 666             int score = 0;
 667
 668             /* channel substitution */
 669             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 670                 uint64_t cmp0 = ch_subst[k][0];
 671                 uint64_t cmp1 = ch_subst[k][1];
 672                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 673                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 674                     in_chlayout  &= ~cmp0;
 675                     out_chlayout &= ~cmp1;
 676                     /* add score for channel match, minus a deduction for
 677                        having to do the substitution */
 678                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 679                 }
 680             }
 681
 682             /* no penalty for LFE channel mismatch */
 683             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 684                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 685                 score += 10;
 686             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 687             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 688
 689             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 690                                                                  out_chlayout);
 691             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 692                                                                  (~in_chlayout));
 693             score += 10 * matched_channels - 5 * extra_channels;
 694
 695             if (score > best_score ||
 696                 (count_diff < best_count_diff && score == best_score)) {
 697                 best_score = score;
 698                 best_idx   = j;
 699                 best_count_diff = count_diff;
 700             }
 701         }
 702         av_assert0(best_idx >= 0);
 703         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 704                outlink->in_channel_layouts->channel_layouts[best_idx]);
 705     }
 706
 707 }
 708
 709 static void swap_channel_layouts(AVFilterGraph *graph)
 710 {
 711     int i;
 712
 713     for (i = 0; i < graph->filter_count; i++)
 714         swap_channel_layouts_on_filter(graph->filters[i]);
 715 }
 716
 717 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 718 {
 719     AVFilterLink *link = NULL;
 720     int format, bps;
 721     int i, j;
 722
 723     for (i = 0; i < filter->nb_inputs; i++) {
 724         link = filter->inputs[i];
 725
 726         if (link->type == AVMEDIA_TYPE_AUDIO &&
 727             link->out_formats->format_count == 1)
 728             break;
 729     }
 730     if (i == filter->nb_inputs)
 731         return;
 732
 733     format = link->out_formats->formats[0];
 734     bps    = av_get_bytes_per_sample(format);
 735
 736     for (i = 0; i < filter->nb_outputs; i++) {
 737         AVFilterLink *outlink = filter->outputs[i];
 738         int best_idx = -1, best_score = INT_MIN;
 739
 740         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 741             outlink->in_formats->format_count < 2)
 742             continue;
 743
 744         for (j = 0; j < outlink->in_formats->format_count; j++) {
 745             int out_format = outlink->in_formats->formats[j];
 746             int out_bps    = av_get_bytes_per_sample(out_format);
 747             int score;
 748
 749             if (av_get_packed_sample_fmt(out_format) == format ||
 750                 av_get_planar_sample_fmt(out_format) == format) {
 751                 best_idx   = j;
 752                 break;
 753             }
 754
 755             /* for s32 and float prefer double to prevent loss of information */
 756             if (bps == 4 && out_bps == 8) {
 757                 best_idx = j;
 758                 break;
 759             }
 760
 761             /* prefer closest higher or equal bps */
 762             score = -abs(out_bps - bps);
 763             if (out_bps >= bps)
 764                 score += INT_MAX/2;
 765
 766             if (score > best_score) {
 767                 best_score = score;
 768                 best_idx   = j;
 769             }
 770         }
 771         av_assert0(best_idx >= 0);
 772         FFSWAP(int, outlink->in_formats->formats[0],
 773                outlink->in_formats->formats[best_idx]);
 774     }
 775 }
 776
 777 static void swap_sample_fmts(AVFilterGraph *graph)
 778 {
 779     int i;
 780
 781     for (i = 0; i < graph->filter_count; i++)
 782         swap_sample_fmts_on_filter(graph->filters[i]);
 783
 784 }
 785
 786 static int pick_formats(AVFilterGraph *graph)
 787 {
 788     int i, j, ret;
 789     int change;
 790
 791     do{
 792         change = 0;
 793         for (i = 0; i < graph->filter_count; i++) {
 794             AVFilterContext *filter = graph->filters[i];
 795             if (filter->nb_inputs){
 796                 for (j = 0; j < filter->nb_inputs; j++){
 797                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 798                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 799                             return ret;
 800                         change = 1;
 801                     }
 802                 }
 803             }
 804             if (filter->nb_outputs){
 805                 for (j = 0; j < filter->nb_outputs; j++){
 806                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 807                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 808                             return ret;
 809                         change = 1;
 810                     }
 811                 }
 812             }
 813             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 814                 for (j = 0; j < filter->nb_outputs; j++) {
 815                     if(filter->outputs[j]->format<0) {
 816                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
 817                             return ret;
 818                         change = 1;
 819                     }
 820                 }
 821             }
 822         }
 823     }while(change);
 824
 825     for (i = 0; i < graph->filter_count; i++) {
 826         AVFilterContext *filter = graph->filters[i];
 827
 828         for (j = 0; j < filter->nb_inputs; j++)
 829             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 830                 return ret;
 831         for (j = 0; j < filter->nb_outputs; j++)
 832             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 833                 return ret;
 834     }
 835     return 0;
 836 }
 837
 838 /**
 839  * Configure the formats of all the links in the graph.
 840  */
 841 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 842 {
 843     int ret;
 844
 845     /* find supported formats from sub-filters, and merge along links */
 846     if ((ret = query_formats(graph, log_ctx)) < 0)
 847         return ret;
 848
 849     /* Once everything is merged, it's possible that we'll still have
 850      * multiple valid media format choices. We try to minimize the amount
 851      * of format conversion inside filters */
 852     reduce_formats(graph);
 853
 854     /* for audio filters, ensure the best format, sample rate and channel layout
 855      * is selected */
 856     swap_sample_fmts(graph);
 857     swap_samplerates(graph);
 858     swap_channel_layouts(graph);
 859
 860     if ((ret = pick_formats(graph)) < 0)
 861         return ret;
 862
 863     return 0;
 864 }
 865
 866 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 867                                              AVClass *log_ctx)
 868 {
 869     unsigned i, j;
 870     int sink_links_count = 0, n = 0;
 871     AVFilterContext *f;
 872     AVFilterLink **sinks;
 873
 874     for (i = 0; i < graph->filter_count; i++) {
 875         f = graph->filters[i];
 876         for (j = 0; j < f->nb_inputs; j++) {
 877             f->inputs[j]->graph     = graph;
 878             f->inputs[j]->age_index = -1;
 879         }
 880         for (j = 0; j < f->nb_outputs; j++) {
 881             f->outputs[j]->graph    = graph;
 882             f->outputs[j]->age_index= -1;
 883         }
 884         if (!f->nb_outputs) {
 885             if (f->nb_inputs > INT_MAX - sink_links_count)
 886                 return AVERROR(EINVAL);
 887             sink_links_count += f->nb_inputs;
 888         }
 889     }
 890     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 891     if (!sinks)
 892         return AVERROR(ENOMEM);
 893     for (i = 0; i < graph->filter_count; i++) {
 894         f = graph->filters[i];
 895         if (!f->nb_outputs) {
 896             for (j = 0; j < f->nb_inputs; j++) {
 897                 sinks[n] = f->inputs[j];
 898                 f->inputs[j]->age_index = n++;
 899             }
 900         }
 901     }
 902     av_assert0(n == sink_links_count);
 903     graph->sink_links       = sinks;
 904     graph->sink_links_count = sink_links_count;
 905     return 0;
 906 }
 907
 908 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 909 {
 910     AVFilterContext *f;
 911     int i, j, ret;
 912     int fifo_count = 0;
 913
 914     for (i = 0; i < graph->filter_count; i++) {
 915         f = graph->filters[i];
 916
 917         for (j = 0; j < f->nb_inputs; j++) {
 918             AVFilterLink *link = f->inputs[j];
 919             AVFilterContext *fifo_ctx;
 920             AVFilter *fifo;
 921             char name[32];
 922
 923             if (!link->dstpad->needs_fifo)
 924                 continue;
 925
 926             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
 927                    avfilter_get_by_name("fifo") :
 928                    avfilter_get_by_name("afifo");
 929
 930             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
 931
 932             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
 933                                                NULL, graph);
 934             if (ret < 0)
 935                 return ret;
 936
 937             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
 938             if (ret < 0)
 939                 return ret;
 940         }
 941     }
 942
 943     return 0;
 944 }
 945
 946 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 947 {
 948     int ret;
 949
 950     if ((ret = graph_check_validity(graphctx, log_ctx)))
 951         return ret;
 952     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
 953         return ret;
 954     if ((ret = graph_config_formats(graphctx, log_ctx)))
 955         return ret;
 956     if ((ret = graph_config_links(graphctx, log_ctx)))
 957         return ret;
 958     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 959         return ret;
 960
 961     return 0;
 962 }
 963
 964 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 965 {
 966     int i, r = AVERROR(ENOSYS);
 967
 968     if(!graph)
 969         return r;
 970
 971     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 972         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 973         if(r != AVERROR(ENOSYS))
 974             return r;
 975     }
 976
 977     if(res_len && res)
 978         res[0]= 0;
 979
 980     for (i = 0; i < graph->filter_count; i++) {
 981         AVFilterContext *filter = graph->filters[i];
 982         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 983             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 984             if(r != AVERROR(ENOSYS)) {
 985                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 986                     return r;
 987             }
 988         }
 989     }
 990
 991     return r;
 992 }
 993
 994 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 995 {
 996     int i;
 997
 998     if(!graph)
 999         return 0;
1000
1001     for (i = 0; i < graph->filter_count; i++) {
1002         AVFilterContext *filter = graph->filters[i];
1003         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1004             AVFilterCommand **queue = &filter->command_queue, *next;
1005             while (*queue && (*queue)->time <= ts)
1006                 queue = &(*queue)->next;
1007             next = *queue;
1008             *queue = av_mallocz(sizeof(AVFilterCommand));
1009             (*queue)->command = av_strdup(command);
1010             (*queue)->arg     = av_strdup(arg);
1011             (*queue)->time    = ts;
1012             (*queue)->flags   = flags;
1013             (*queue)->next    = next;
1014             if(flags & AVFILTER_CMD_FLAG_ONE)
1015                 return 0;
1016         }
1017     }
1018
1019     return 0;
1020 }
1021
1022 static void heap_bubble_up(AVFilterGraph *graph,
1023                            AVFilterLink *link, int index)
1024 {
1025     AVFilterLink **links = graph->sink_links;
1026
1027     while (index) {
1028         int parent = (index - 1) >> 1;
1029         if (links[parent]->current_pts >= link->current_pts)
1030             break;
1031         links[index] = links[parent];
1032         links[index]->age_index = index;
1033         index = parent;
1034     }
1035     links[index] = link;
1036     link->age_index = index;
1037 }
1038
1039 static void heap_bubble_down(AVFilterGraph *graph,
1040                              AVFilterLink *link, int index)
1041 {
1042     AVFilterLink **links = graph->sink_links;
1043
1044     while (1) {
1045         int child = 2 * index + 1;
1046         if (child >= graph->sink_links_count)
1047             break;
1048         if (child + 1 < graph->sink_links_count &&
1049             links[child + 1]->current_pts < links[child]->current_pts)
1050             child++;
1051         if (link->current_pts < links[child]->current_pts)
1052             break;
1053         links[index] = links[child];
1054         links[index]->age_index = index;
1055         index = child;
1056     }
1057     links[index] = link;
1058     link->age_index = index;
1059 }
1060
1061 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1062 {
1063     heap_bubble_up  (graph, link, link->age_index);
1064     heap_bubble_down(graph, link, link->age_index);
1065 }
1066
1067
1068 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1069 {
1070     while (graph->sink_links_count) {
1071         AVFilterLink *oldest = graph->sink_links[0];
1072         int r = ff_request_frame(oldest);
1073         if (r != AVERROR_EOF)
1074             return r;
1075         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1076                oldest->dst ? oldest->dst->name : "unknown",
1077                oldest->dstpad ? oldest->dstpad->name : "unknown");
1078         /* EOF: remove the link from the heap */
1079         if (oldest->age_index < --graph->sink_links_count)
1080             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1081                              oldest->age_index);
1082         oldest->age_index = -1;
1083     }
1084     return AVERROR_EOF;
1085 }