git.sesse.net Git - ffmpeg/blob - libavfilter/avfiltergraph.c

   1 /*
   2  * filter graphs
   3  * Copyright (c) 2008 Vitor Sessak
   4  * Copyright (c) 2007 Bobby Bingham
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <ctype.h>
  24 #include <string.h>
  25
  26 #include "libavutil/audioconvert.h"
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "avfilter.h"
  30 #include "avfiltergraph.h"
  31 #include "formats.h"
  32 #include "internal.h"
  33
  34 #include "libavutil/audioconvert.h"
  35 #include "libavutil/log.h"
  36
  37 static const AVClass filtergraph_class = {
  38     .class_name = "AVFilterGraph",
  39     .item_name  = av_default_item_name,
  40     .version    = LIBAVUTIL_VERSION_INT,
  41 };
  42
  43 AVFilterGraph *avfilter_graph_alloc(void)
  44 {
  45     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  46     if (!ret)
  47         return NULL;
  48 #if FF_API_GRAPH_AVCLASS
  49     ret->av_class = &filtergraph_class;
  50 #endif
  51     return ret;
  52 }
  53
  54 void avfilter_graph_free(AVFilterGraph **graph)
  55 {
  56     if (!*graph)
  57         return;
  58     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  59         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  60     av_freep(&(*graph)->sink_links);
  61     av_freep(&(*graph)->scale_sws_opts);
  62     av_freep(&(*graph)->filters);
  63     av_freep(graph);
  64 }
  65
  66 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  67 {
  68     AVFilterContext **filters = av_realloc(graph->filters,
  69                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  70     if (!filters)
  71         return AVERROR(ENOMEM);
  72
  73     graph->filters = filters;
  74     graph->filters[graph->filter_count++] = filter;
  75
  76     return 0;
  77 }
  78
  79 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  80                                  const char *name, const char *args, void *opaque,
  81                                  AVFilterGraph *graph_ctx)
  82 {
  83     int ret;
  84
  85     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  86         goto fail;
  87     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  88         goto fail;
  89     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  90         goto fail;
  91     return 0;
  92
  93 fail:
  94     if (*filt_ctx)
  95         avfilter_free(*filt_ctx);
  96     *filt_ctx = NULL;
  97     return ret;
  98 }
  99
 100 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 101 {
 102     graph->disable_auto_convert = flags;
 103 }
 104
 105 /**
 106  * Check for the validity of graph.
 107  *
 108  * A graph is considered valid if all its input and output pads are
 109  * connected.
 110  *
 111  * @return 0 in case of success, a negative value otherwise
 112  */
 113 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 114 {
 115     AVFilterContext *filt;
 116     int i, j;
 117
 118     for (i = 0; i < graph->filter_count; i++) {
 119         filt = graph->filters[i];
 120
 121         for (j = 0; j < filt->input_count; j++) {
 122             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 123                 av_log(log_ctx, AV_LOG_ERROR,
 124                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
 125                        filt->input_pads[j].name, filt->name, filt->filter->name);
 126                 return AVERROR(EINVAL);
 127             }
 128         }
 129
 130         for (j = 0; j < filt->output_count; j++) {
 131             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 132                 av_log(log_ctx, AV_LOG_ERROR,
 133                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
 134                        filt->output_pads[j].name, filt->name, filt->filter->name);
 135                 return AVERROR(EINVAL);
 136             }
 137         }
 138     }
 139
 140     return 0;
 141 }
 142
 143 /**
 144  * Configure all the links of graphctx.
 145  *
 146  * @return 0 in case of success, a negative value otherwise
 147  */
 148 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 149 {
 150     AVFilterContext *filt;
 151     int i, ret;
 152
 153     for (i=0; i < graph->filter_count; i++) {
 154         filt = graph->filters[i];
 155
 156         if (!filt->output_count) {
 157             if ((ret = avfilter_config_links(filt)))
 158                 return ret;
 159         }
 160     }
 161
 162     return 0;
 163 }
 164
 165 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 166 {
 167     int i;
 168
 169     for (i = 0; i < graph->filter_count; i++)
 170         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 171             return graph->filters[i];
 172
 173     return NULL;
 174 }
 175
 176 static int filter_query_formats(AVFilterContext *ctx)
 177 {
 178     int ret;
 179     AVFilterFormats *formats;
 180     AVFilterChannelLayouts *chlayouts;
 181     AVFilterFormats *samplerates;
 182     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 183                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 184                             AVMEDIA_TYPE_VIDEO;
 185
 186     if ((ret = ctx->filter->query_formats(ctx)) < 0)
 187         return ret;
 188
 189     formats = avfilter_make_all_formats(type);
 190     if (!formats)
 191         return AVERROR(ENOMEM);
 192     avfilter_set_common_formats(ctx, formats);
 193     if (type == AVMEDIA_TYPE_AUDIO) {
 194         samplerates = ff_all_samplerates();
 195         if (!samplerates)
 196             return AVERROR(ENOMEM);
 197         ff_set_common_samplerates(ctx, samplerates);
 198         chlayouts = ff_all_channel_layouts();
 199         if (!chlayouts)
 200             return AVERROR(ENOMEM);
 201         ff_set_common_channel_layouts(ctx, chlayouts);
 202     }
 203     return 0;
 204 }
 205
 206 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 207                               const char *filt_name, const char *filt_args)
 208 {
 209     static int auto_count = 0, ret;
 210     char inst_name[32];
 211     AVFilterContext *filt_ctx;
 212
 213     if (graph->disable_auto_convert) {
 214         av_log(NULL, AV_LOG_ERROR,
 215                "The filters '%s' and '%s' do not have a common format "
 216                "and automatic conversion is disabled.\n",
 217                link->src->name, link->dst->name);
 218         return AVERROR(EINVAL);
 219     }
 220
 221     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 222             filt_name, auto_count++);
 223
 224     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 225                                             avfilter_get_by_name(filt_name),
 226                                             inst_name, filt_args, NULL, graph)) < 0)
 227         return ret;
 228     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 229         return ret;
 230
 231     filter_query_formats(filt_ctx);
 232
 233     if ( ((link = filt_ctx-> inputs[0]) &&
 234            !avfilter_merge_formats(link->in_formats, link->out_formats)) ||
 235          ((link = filt_ctx->outputs[0]) &&
 236            !avfilter_merge_formats(link->in_formats, link->out_formats))
 237        ) {
 238         av_log(NULL, AV_LOG_ERROR,
 239                "Impossible to convert between the formats supported by the filter "
 240                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 241         return AVERROR(EINVAL);
 242     }
 243
 244     if (link->type == AVMEDIA_TYPE_AUDIO &&
 245          (((link = filt_ctx-> inputs[0]) &&
 246            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 247          ((link = filt_ctx->outputs[0]) &&
 248            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 249        ) {
 250         av_log(NULL, AV_LOG_ERROR,
 251                "Impossible to convert between the channel layouts formats supported by the filter "
 252                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 253         return AVERROR(EINVAL);
 254     }
 255
 256     return 0;
 257 }
 258
 259 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 260 {
 261     int i, j, ret;
 262     char filt_args[128];
 263     AVFilterFormats *formats;
 264     AVFilterChannelLayouts *chlayouts;
 265     AVFilterFormats *samplerates;
 266     int scaler_count = 0, resampler_count = 0;
 267
 268     for (j = 0; j < 2; j++) {
 269     /* ask all the sub-filters for their supported media formats */
 270     for (i = 0; i < graph->filter_count; i++) {
 271         /* Call query_formats on sources first.
 272            This is a temporary workaround for amerge,
 273            until format renegociation is implemented. */
 274         if (!graph->filters[i]->input_count == j)
 275             continue;
 276         if (graph->filters[i]->filter->query_formats)
 277             ret = filter_query_formats(graph->filters[i]);
 278         else
 279             ret = ff_default_query_formats(graph->filters[i]);
 280         if (ret < 0)
 281             return ret;
 282     }
 283     }
 284
 285     /* go through and merge as many format lists as possible */
 286     for (i = 0; i < graph->filter_count; i++) {
 287         AVFilterContext *filter = graph->filters[i];
 288
 289         for (j = 0; j < filter->input_count; j++) {
 290             AVFilterLink *link = filter->inputs[j];
 291 #if 0
 292             if (!link) continue;
 293
 294             if (!link->in_formats || !link->out_formats)
 295                 return AVERROR(EINVAL);
 296
 297             if (link->type == AVMEDIA_TYPE_VIDEO &&
 298                 !avfilter_merge_formats(link->in_formats, link->out_formats)) {
 299
 300                 /* couldn't merge format lists, auto-insert scale filter */
 301                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 302                          graph->scale_sws_opts);
 303                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 304                     return ret;
 305             }
 306             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 307                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 308                     return AVERROR(EINVAL);
 309
 310                 /* Merge all three list before checking: that way, in all
 311                  * three categories, aconvert will use a common format
 312                  * whenever possible. */
 313                 formats   = avfilter_merge_formats(link->in_formats,   link->out_formats);
 314                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 315                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 316
 317                 if (!formats || !chlayouts || !samplerates)
 318                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 319                        return ret;
 320 #else
 321             int convert_needed = 0;
 322
 323             if (!link)
 324                 continue;
 325
 326             if (link->in_formats != link->out_formats &&
 327                 !ff_merge_formats(link->in_formats,
 328                                         link->out_formats))
 329                 convert_needed = 1;
 330             if (link->type == AVMEDIA_TYPE_AUDIO) {
 331                 if (link->in_channel_layouts != link->out_channel_layouts &&
 332                     !ff_merge_channel_layouts(link->in_channel_layouts,
 333                                               link->out_channel_layouts))
 334                     convert_needed = 1;
 335                 if (link->in_samplerates != link->out_samplerates &&
 336                     !ff_merge_samplerates(link->in_samplerates,
 337                                           link->out_samplerates))
 338                     convert_needed = 1;
 339             }
 340
 341             if (convert_needed) {
 342                 AVFilterContext *convert;
 343                 AVFilter *filter;
 344                 AVFilterLink *inlink, *outlink;
 345                 char scale_args[256];
 346                 char inst_name[30];
 347
 348                 /* couldn't merge format lists. auto-insert conversion filter */
 349                 switch (link->type) {
 350                 case AVMEDIA_TYPE_VIDEO:
 351                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 352                              scaler_count++);
 353                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 354                     if ((ret = avfilter_graph_create_filter(&convert,
 355                                                             avfilter_get_by_name("scale"),
 356                                                             inst_name, scale_args, NULL,
 357                                                             graph)) < 0)
 358                         return ret;
 359                     break;
 360                 case AVMEDIA_TYPE_AUDIO:
 361                     if (!(filter = avfilter_get_by_name("aresample"))) {
 362                         av_log(log_ctx, AV_LOG_ERROR, "'resample' filter "
 363                                "not present, cannot convert audio formats.\n");
 364                         return AVERROR(EINVAL);
 365                     }
 366
 367                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 368                              resampler_count++);
 369                     if ((ret = avfilter_graph_create_filter(&convert,
 370                                                             avfilter_get_by_name("aresample"),
 371                                                             inst_name, NULL, NULL, graph)) < 0)
 372                         return ret;
 373                     break;
 374                 default:
 375                     return AVERROR(EINVAL);
 376                 }
 377
 378                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 379                     return ret;
 380
 381                 filter_query_formats(convert);
 382                 inlink  = convert->inputs[0];
 383                 outlink = convert->outputs[0];
 384                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 385                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 386                     ret |= AVERROR(ENOSYS);
 387                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 388                     (!ff_merge_samplerates(inlink->in_samplerates,
 389                                            inlink->out_samplerates) ||
 390                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 391                                                inlink->out_channel_layouts)))
 392                     ret |= AVERROR(ENOSYS);
 393                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 394                     (!ff_merge_samplerates(outlink->in_samplerates,
 395                                            outlink->out_samplerates) ||
 396                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 397                                                outlink->out_channel_layouts)))
 398                     ret |= AVERROR(ENOSYS);
 399
 400                 if (ret < 0) {
 401                     av_log(log_ctx, AV_LOG_ERROR,
 402                            "Impossible to convert between the formats supported by the filter "
 403                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 404                     return ret;
 405                 }
 406 #endif
 407             }
 408         }
 409     }
 410
 411     return 0;
 412 }
 413
 414 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 415 {
 416     if (!link || !link->in_formats)
 417         return 0;
 418
 419     if (link->type == AVMEDIA_TYPE_VIDEO) {
 420         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 421             int has_alpha= av_pix_fmt_descriptors[ref->format].nb_components % 2 == 0;
 422             enum PixelFormat best= PIX_FMT_NONE;
 423             int i;
 424             for (i=0; i<link->in_formats->format_count; i++) {
 425                 enum PixelFormat p = link->in_formats->formats[i];
 426                 best= avcodec_find_best_pix_fmt2(best, p, ref->format, has_alpha, NULL);
 427             }
 428             link->in_formats->formats[0] = best;
 429         }
 430     }
 431
 432     link->in_formats->format_count = 1;
 433     link->format = link->in_formats->formats[0];
 434
 435     if (link->type == AVMEDIA_TYPE_AUDIO) {
 436         if (!link->in_samplerates->format_count) {
 437             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 438                    " the link between filters %s and %s.\n", link->src->name,
 439                    link->dst->name);
 440             return AVERROR(EINVAL);
 441         }
 442         link->in_samplerates->format_count = 1;
 443         link->sample_rate = link->in_samplerates->formats[0];
 444
 445         if (!link->in_channel_layouts->nb_channel_layouts) {
 446             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 447                    "the link between filters %s and %s.\n", link->src->name,
 448                    link->dst->name);
 449             return AVERROR(EINVAL);
 450         }
 451         link->in_channel_layouts->nb_channel_layouts = 1;
 452         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 453     }
 454
 455     ff_formats_unref(&link->in_formats);
 456     ff_formats_unref(&link->out_formats);
 457     ff_formats_unref(&link->in_samplerates);
 458     ff_formats_unref(&link->out_samplerates);
 459     ff_channel_layouts_unref(&link->in_channel_layouts);
 460     ff_channel_layouts_unref(&link->out_channel_layouts);
 461
 462     return 0;
 463 }
 464
 465 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 466 do {                                                                   \
 467     for (i = 0; i < filter->input_count; i++) {                        \
 468         AVFilterLink *link = filter->inputs[i];                        \
 469         fmt_type fmt;                                                  \
 470                                                                        \
 471         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 472             continue;                                                  \
 473         fmt = link->out_ ## list->var[0];                              \
 474                                                                        \
 475         for (j = 0; j < filter->output_count; j++) {                   \
 476             AVFilterLink *out_link = filter->outputs[j];               \
 477             list_type *fmts;                                           \
 478                                                                        \
 479             if (link->type != out_link->type ||                        \
 480                 out_link->in_ ## list->nb == 1)                        \
 481                 continue;                                              \
 482             fmts = out_link->in_ ## list;                              \
 483                                                                        \
 484             if (!out_link->in_ ## list->nb) {                          \
 485                 add_format(&out_link->in_ ##list, fmt);                \
 486                 break;                                                 \
 487             }                                                          \
 488                                                                        \
 489             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 490                 if (fmts->var[k] == fmt) {                             \
 491                     fmts->var[0]  = fmt;                               \
 492                     fmts->nb = 1;                                      \
 493                     ret = 1;                                           \
 494                     break;                                             \
 495                 }                                                      \
 496         }                                                              \
 497     }                                                                  \
 498 } while (0)
 499
 500 static int reduce_formats_on_filter(AVFilterContext *filter)
 501 {
 502     int i, j, k, ret = 0;
 503
 504     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 505                    format_count, ff_add_format);
 506     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 507                    format_count, ff_add_format);
 508     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
 509                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 510
 511     return ret;
 512 }
 513
 514 static void reduce_formats(AVFilterGraph *graph)
 515 {
 516     int i, reduced;
 517
 518     do {
 519         reduced = 0;
 520
 521         for (i = 0; i < graph->filter_count; i++)
 522             reduced |= reduce_formats_on_filter(graph->filters[i]);
 523     } while (reduced);
 524 }
 525
 526 static void swap_samplerates_on_filter(AVFilterContext *filter)
 527 {
 528     AVFilterLink *link = NULL;
 529     int sample_rate;
 530     int i, j;
 531
 532     for (i = 0; i < filter->input_count; i++) {
 533         link = filter->inputs[i];
 534
 535         if (link->type == AVMEDIA_TYPE_AUDIO &&
 536             link->out_samplerates->format_count == 1)
 537             break;
 538     }
 539     if (i == filter->input_count)
 540         return;
 541
 542     sample_rate = link->out_samplerates->formats[0];
 543
 544     for (i = 0; i < filter->output_count; i++) {
 545         AVFilterLink *outlink = filter->outputs[i];
 546         int best_idx, best_diff = INT_MAX;
 547
 548         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 549             outlink->in_samplerates->format_count < 2)
 550             continue;
 551
 552         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 553             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 554
 555             if (diff < best_diff) {
 556                 best_diff = diff;
 557                 best_idx  = j;
 558             }
 559         }
 560         FFSWAP(int, outlink->in_samplerates->formats[0],
 561                outlink->in_samplerates->formats[best_idx]);
 562     }
 563 }
 564
 565 static void swap_samplerates(AVFilterGraph *graph)
 566 {
 567     int i;
 568
 569     for (i = 0; i < graph->filter_count; i++)
 570         swap_samplerates_on_filter(graph->filters[i]);
 571 }
 572
 573 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 574 {
 575     AVFilterLink *link = NULL;
 576     uint64_t chlayout;
 577     int i, j;
 578
 579     for (i = 0; i < filter->input_count; i++) {
 580         link = filter->inputs[i];
 581
 582         if (link->type == AVMEDIA_TYPE_AUDIO &&
 583             link->out_channel_layouts->nb_channel_layouts == 1)
 584             break;
 585     }
 586     if (i == filter->input_count)
 587         return;
 588
 589     chlayout = link->out_channel_layouts->channel_layouts[0];
 590
 591     for (i = 0; i < filter->output_count; i++) {
 592         AVFilterLink *outlink = filter->outputs[i];
 593         int best_idx, best_score = INT_MIN;
 594
 595         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 596             outlink->in_channel_layouts->nb_channel_layouts < 2)
 597             continue;
 598
 599         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 600             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 601             int matched_channels  = av_get_channel_layout_nb_channels(chlayout &
 602                                                                       out_chlayout);
 603             int extra_channels     = av_get_channel_layout_nb_channels(out_chlayout &
 604                                                                        (~chlayout));
 605             int score = matched_channels - extra_channels;
 606
 607             if (score > best_score) {
 608                 best_score = score;
 609                 best_idx   = j;
 610             }
 611         }
 612         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 613                outlink->in_channel_layouts->channel_layouts[best_idx]);
 614     }
 615
 616 }
 617
 618 static void swap_channel_layouts(AVFilterGraph *graph)
 619 {
 620     int i;
 621
 622     for (i = 0; i < graph->filter_count; i++)
 623         swap_channel_layouts_on_filter(graph->filters[i]);
 624 }
 625
 626 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 627 {
 628     AVFilterLink *link = NULL;
 629     int format, bps;
 630     int i, j;
 631
 632     for (i = 0; i < filter->input_count; i++) {
 633         link = filter->inputs[i];
 634
 635         if (link->type == AVMEDIA_TYPE_AUDIO &&
 636             link->out_formats->format_count == 1)
 637             break;
 638     }
 639     if (i == filter->input_count)
 640         return;
 641
 642     format = link->out_formats->formats[0];
 643     bps    = av_get_bytes_per_sample(format);
 644
 645     for (i = 0; i < filter->output_count; i++) {
 646         AVFilterLink *outlink = filter->outputs[i];
 647         int best_idx, best_score = INT_MIN;
 648
 649         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 650             outlink->in_formats->format_count < 2)
 651             continue;
 652
 653         for (j = 0; j < outlink->in_formats->format_count; j++) {
 654             int out_format = outlink->in_formats->formats[j];
 655             int out_bps    = av_get_bytes_per_sample(out_format);
 656             int score;
 657
 658             if (av_get_packed_sample_fmt(out_format) == format ||
 659                 av_get_planar_sample_fmt(out_format) == format) {
 660                 best_idx   = j;
 661                 break;
 662             }
 663
 664             /* for s32 and float prefer double to prevent loss of information */
 665             if (bps == 4 && out_bps == 8) {
 666                 best_idx = j;
 667                 break;
 668             }
 669
 670             /* prefer closest higher or equal bps */
 671             score = -abs(out_bps - bps);
 672             if (out_bps >= bps)
 673                 score += INT_MAX/2;
 674
 675             if (score > best_score) {
 676                 best_score = score;
 677                 best_idx   = j;
 678             }
 679         }
 680         FFSWAP(int, outlink->in_formats->formats[0],
 681                outlink->in_formats->formats[best_idx]);
 682     }
 683 }
 684
 685 static void swap_sample_fmts(AVFilterGraph *graph)
 686 {
 687     int i;
 688
 689     for (i = 0; i < graph->filter_count; i++)
 690         swap_sample_fmts_on_filter(graph->filters[i]);
 691
 692 }
 693
 694 static int pick_formats(AVFilterGraph *graph)
 695 {
 696     int i, j, ret;
 697     int change;
 698
 699     do{
 700         change = 0;
 701         for (i = 0; i < graph->filter_count; i++) {
 702             AVFilterContext *filter = graph->filters[i];
 703             if (filter->input_count){
 704                 for (j = 0; j < filter->input_count; j++){
 705                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 706                         pick_format(filter->inputs[j], NULL);
 707                         change = 1;
 708                     }
 709                 }
 710             }
 711             if (filter->output_count){
 712                 for (j = 0; j < filter->output_count; j++){
 713                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 714                         pick_format(filter->outputs[j], NULL);
 715                         change = 1;
 716                     }
 717                 }
 718             }
 719             if (filter->input_count && filter->output_count && filter->inputs[0]->format>=0) {
 720                 for (j = 0; j < filter->output_count; j++) {
 721                     if(filter->outputs[j]->format<0) {
 722                         pick_format(filter->outputs[j], filter->inputs[0]);
 723                         change = 1;
 724                     }
 725                 }
 726             }
 727         }
 728     }while(change);
 729
 730     for (i = 0; i < graph->filter_count; i++) {
 731         AVFilterContext *filter = graph->filters[i];
 732
 733         for (j = 0; j < filter->input_count; j++)
 734             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 735                 return ret;
 736         for (j = 0; j < filter->output_count; j++)
 737             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 738                 return ret;
 739     }
 740     return 0;
 741 }
 742
 743 /**
 744  * Configure the formats of all the links in the graph.
 745  */
 746 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 747 {
 748     int ret;
 749
 750     /* find supported formats from sub-filters, and merge along links */
 751     if ((ret = query_formats(graph, log_ctx)) < 0)
 752         return ret;
 753
 754     /* Once everything is merged, it's possible that we'll still have
 755      * multiple valid media format choices. We try to minimize the amount
 756      * of format conversion inside filters */
 757     reduce_formats(graph);
 758
 759     /* for audio filters, ensure the best format, sample rate and channel layout
 760      * is selected */
 761     swap_sample_fmts(graph);
 762     swap_samplerates(graph);
 763     swap_channel_layouts(graph);
 764
 765     if ((ret = pick_formats(graph)) < 0)
 766         return ret;
 767
 768     return 0;
 769 }
 770
 771 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 772                                              AVClass *log_ctx)
 773 {
 774     unsigned i, j;
 775     int sink_links_count = 0, n = 0;
 776     AVFilterContext *f;
 777     AVFilterLink **sinks;
 778
 779     for (i = 0; i < graph->filter_count; i++) {
 780         f = graph->filters[i];
 781         for (j = 0; j < f->input_count; j++) {
 782             f->inputs[j]->graph     = graph;
 783             f->inputs[j]->age_index = -1;
 784         }
 785         for (j = 0; j < f->output_count; j++) {
 786             f->outputs[j]->graph    = graph;
 787             f->outputs[j]->age_index= -1;
 788         }
 789         if (!f->output_count) {
 790             if (f->input_count > INT_MAX - sink_links_count)
 791                 return AVERROR(EINVAL);
 792             sink_links_count += f->input_count;
 793         }
 794     }
 795     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 796     if (!sinks)
 797         return AVERROR(ENOMEM);
 798     for (i = 0; i < graph->filter_count; i++) {
 799         f = graph->filters[i];
 800         if (!f->output_count) {
 801             for (j = 0; j < f->input_count; j++) {
 802                 sinks[n] = f->inputs[j];
 803                 f->inputs[j]->age_index = n++;
 804             }
 805         }
 806     }
 807     av_assert0(n == sink_links_count);
 808     graph->sink_links       = sinks;
 809     graph->sink_links_count = sink_links_count;
 810     return 0;
 811 }
 812
 813 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 814 {
 815     int ret;
 816
 817     if ((ret = graph_check_validity(graphctx, log_ctx)))
 818         return ret;
 819     if ((ret = graph_config_formats(graphctx, log_ctx)))
 820         return ret;
 821     if ((ret = graph_config_links(graphctx, log_ctx)))
 822         return ret;
 823     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 824         return ret;
 825
 826     return 0;
 827 }
 828
 829 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 830 {
 831     int i, r = AVERROR(ENOSYS);
 832
 833     if(!graph)
 834         return r;
 835
 836     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 837         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 838         if(r != AVERROR(ENOSYS))
 839             return r;
 840     }
 841
 842     if(res_len && res)
 843         res[0]= 0;
 844
 845     for (i = 0; i < graph->filter_count; i++) {
 846         AVFilterContext *filter = graph->filters[i];
 847         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 848             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 849             if(r != AVERROR(ENOSYS)) {
 850                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 851                     return r;
 852             }
 853         }
 854     }
 855
 856     return r;
 857 }
 858
 859 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 860 {
 861     int i;
 862
 863     if(!graph)
 864         return 0;
 865
 866     for (i = 0; i < graph->filter_count; i++) {
 867         AVFilterContext *filter = graph->filters[i];
 868         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 869             AVFilterCommand **que = &filter->command_queue, *next;
 870             while(*que && (*que)->time <= ts)
 871                 que = &(*que)->next;
 872             next= *que;
 873             *que= av_mallocz(sizeof(AVFilterCommand));
 874             (*que)->command = av_strdup(command);
 875             (*que)->arg     = av_strdup(arg);
 876             (*que)->time    = ts;
 877             (*que)->flags   = flags;
 878             (*que)->next    = next;
 879             if(flags & AVFILTER_CMD_FLAG_ONE)
 880                 return 0;
 881         }
 882     }
 883
 884     return 0;
 885 }
 886
 887 static void heap_bubble_up(AVFilterGraph *graph,
 888                            AVFilterLink *link, int index)
 889 {
 890     AVFilterLink **links = graph->sink_links;
 891
 892     while (index) {
 893         int parent = (index - 1) >> 1;
 894         if (links[parent]->current_pts >= link->current_pts)
 895             break;
 896         links[index] = links[parent];
 897         links[index]->age_index = index;
 898         index = parent;
 899     }
 900     links[index] = link;
 901     link->age_index = index;
 902 }
 903
 904 static void heap_bubble_down(AVFilterGraph *graph,
 905                              AVFilterLink *link, int index)
 906 {
 907     AVFilterLink **links = graph->sink_links;
 908
 909     while (1) {
 910         int child = 2 * index + 1;
 911         if (child >= graph->sink_links_count)
 912             break;
 913         if (child + 1 < graph->sink_links_count &&
 914             links[child + 1]->current_pts < links[child]->current_pts)
 915             child++;
 916         if (link->current_pts < links[child]->current_pts)
 917             break;
 918         links[index] = links[child];
 919         links[index]->age_index = index;
 920         index = child;
 921     }
 922     links[index] = link;
 923     link->age_index = index;
 924 }
 925
 926 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
 927 {
 928     heap_bubble_up  (graph, link, link->age_index);
 929     heap_bubble_down(graph, link, link->age_index);
 930 }
 931
 932
 933 int avfilter_graph_request_oldest(AVFilterGraph *graph)
 934 {
 935     while (graph->sink_links_count) {
 936         AVFilterLink *oldest = graph->sink_links[0];
 937         int r = avfilter_request_frame(oldest);
 938         if (r != AVERROR_EOF)
 939             return r;
 940         /* EOF: remove the link from the heap */
 941         if (oldest->age_index < --graph->sink_links_count)
 942             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
 943                              oldest->age_index);
 944         oldest->age_index = -1;
 945     }
 946     return AVERROR_EOF;
 947 }