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

   1 /*
   2  * filter graphs
   3  * Copyright (c) 2008 Vitor Sessak
   4  * Copyright (c) 2007 Bobby Bingham
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <ctype.h>
  24 #include <string.h>
  25
  26 #include "libavutil/audioconvert.h"
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt2()
  30 #include "avfilter.h"
  31 #include "avfiltergraph.h"
  32 #include "formats.h"
  33 #include "internal.h"
  34
  35 #include "libavutil/audioconvert.h"
  36 #include "libavutil/avassert.h"
  37 #include "libavutil/log.h"
  38
  39 static const AVClass filtergraph_class = {
  40     .class_name = "AVFilterGraph",
  41     .item_name  = av_default_item_name,
  42     .version    = LIBAVUTIL_VERSION_INT,
  43     .category   = AV_CLASS_CATEGORY_FILTER,
  44 };
  45
  46 AVFilterGraph *avfilter_graph_alloc(void)
  47 {
  48     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  49     if (!ret)
  50         return NULL;
  51     ret->av_class = &filtergraph_class;
  52     return ret;
  53 }
  54
  55 void avfilter_graph_free(AVFilterGraph **graph)
  56 {
  57     if (!*graph)
  58         return;
  59     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  60         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  61     av_freep(&(*graph)->sink_links);
  62     av_freep(&(*graph)->scale_sws_opts);
  63     av_freep(&(*graph)->filters);
  64     av_freep(graph);
  65 }
  66
  67 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  68 {
  69     AVFilterContext **filters = av_realloc(graph->filters,
  70                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  71     if (!filters)
  72         return AVERROR(ENOMEM);
  73
  74     graph->filters = filters;
  75     graph->filters[graph->filter_count++] = filter;
  76
  77     return 0;
  78 }
  79
  80 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  81                                  const char *name, const char *args, void *opaque,
  82                                  AVFilterGraph *graph_ctx)
  83 {
  84     int ret;
  85
  86     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  87         goto fail;
  88     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  89         goto fail;
  90     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  91         goto fail;
  92     return 0;
  93
  94 fail:
  95     if (*filt_ctx)
  96         avfilter_free(*filt_ctx);
  97     *filt_ctx = NULL;
  98     return ret;
  99 }
 100
 101 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 102 {
 103     graph->disable_auto_convert = flags;
 104 }
 105
 106 /**
 107  * Check for the validity of graph.
 108  *
 109  * A graph is considered valid if all its input and output pads are
 110  * connected.
 111  *
 112  * @return 0 in case of success, a negative value otherwise
 113  */
 114 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 115 {
 116     AVFilterContext *filt;
 117     int i, j;
 118
 119     for (i = 0; i < graph->filter_count; i++) {
 120         filt = graph->filters[i];
 121
 122         for (j = 0; j < filt->nb_inputs; j++) {
 123             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 124                 av_log(log_ctx, AV_LOG_ERROR,
 125                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
 126                        filt->input_pads[j].name, filt->name, filt->filter->name);
 127                 return AVERROR(EINVAL);
 128             }
 129         }
 130
 131         for (j = 0; j < filt->nb_outputs; j++) {
 132             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 133                 av_log(log_ctx, AV_LOG_ERROR,
 134                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
 135                        filt->output_pads[j].name, filt->name, filt->filter->name);
 136                 return AVERROR(EINVAL);
 137             }
 138         }
 139     }
 140
 141     return 0;
 142 }
 143
 144 /**
 145  * Configure all the links of graphctx.
 146  *
 147  * @return 0 in case of success, a negative value otherwise
 148  */
 149 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 150 {
 151     AVFilterContext *filt;
 152     int i, ret;
 153
 154     for (i=0; i < graph->filter_count; i++) {
 155         filt = graph->filters[i];
 156
 157         if (!filt->nb_outputs) {
 158             if ((ret = avfilter_config_links(filt)))
 159                 return ret;
 160         }
 161     }
 162
 163     return 0;
 164 }
 165
 166 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 167 {
 168     int i;
 169
 170     for (i = 0; i < graph->filter_count; i++)
 171         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 172             return graph->filters[i];
 173
 174     return NULL;
 175 }
 176
 177 static int filter_query_formats(AVFilterContext *ctx)
 178 {
 179     int ret;
 180     AVFilterFormats *formats;
 181     AVFilterChannelLayouts *chlayouts;
 182     AVFilterFormats *samplerates;
 183     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 184                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 185                             AVMEDIA_TYPE_VIDEO;
 186
 187     if ((ret = ctx->filter->query_formats(ctx)) < 0)
 188         return ret;
 189
 190     formats = ff_all_formats(type);
 191     if (!formats)
 192         return AVERROR(ENOMEM);
 193     ff_set_common_formats(ctx, formats);
 194     if (type == AVMEDIA_TYPE_AUDIO) {
 195         samplerates = ff_all_samplerates();
 196         if (!samplerates)
 197             return AVERROR(ENOMEM);
 198         ff_set_common_samplerates(ctx, samplerates);
 199         chlayouts = ff_all_channel_layouts();
 200         if (!chlayouts)
 201             return AVERROR(ENOMEM);
 202         ff_set_common_channel_layouts(ctx, chlayouts);
 203     }
 204     return 0;
 205 }
 206
 207 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 208                               const char *filt_name, const char *filt_args)
 209 {
 210     static int auto_count = 0, ret;
 211     char inst_name[32];
 212     AVFilterContext *filt_ctx;
 213
 214     if (graph->disable_auto_convert) {
 215         av_log(NULL, AV_LOG_ERROR,
 216                "The filters '%s' and '%s' do not have a common format "
 217                "and automatic conversion is disabled.\n",
 218                link->src->name, link->dst->name);
 219         return AVERROR(EINVAL);
 220     }
 221
 222     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 223             filt_name, auto_count++);
 224
 225     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 226                                             avfilter_get_by_name(filt_name),
 227                                             inst_name, filt_args, NULL, graph)) < 0)
 228         return ret;
 229     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 230         return ret;
 231
 232     filter_query_formats(filt_ctx);
 233
 234     if ( ((link = filt_ctx-> inputs[0]) &&
 235            !ff_merge_formats(link->in_formats, link->out_formats)) ||
 236          ((link = filt_ctx->outputs[0]) &&
 237            !ff_merge_formats(link->in_formats, link->out_formats))
 238        ) {
 239         av_log(NULL, AV_LOG_ERROR,
 240                "Impossible to convert between the formats supported by the filter "
 241                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 242         return AVERROR(EINVAL);
 243     }
 244
 245     if (link->type == AVMEDIA_TYPE_AUDIO &&
 246          (((link = filt_ctx-> inputs[0]) &&
 247            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 248          ((link = filt_ctx->outputs[0]) &&
 249            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 250        ) {
 251         av_log(NULL, AV_LOG_ERROR,
 252                "Impossible to convert between the channel layouts formats supported by the filter "
 253                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 254         return AVERROR(EINVAL);
 255     }
 256
 257     return 0;
 258 }
 259
 260 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 261 {
 262     int i, j, ret;
 263     char filt_args[128];
 264     AVFilterFormats *formats;
 265     AVFilterChannelLayouts *chlayouts;
 266     AVFilterFormats *samplerates;
 267     int scaler_count = 0, resampler_count = 0;
 268
 269     for (j = 0; j < 2; j++) {
 270     /* ask all the sub-filters for their supported media formats */
 271     for (i = 0; i < graph->filter_count; i++) {
 272         /* Call query_formats on sources first.
 273            This is a temporary workaround for amerge,
 274            until format renegociation is implemented. */
 275         if (!graph->filters[i]->nb_inputs == j)
 276             continue;
 277         if (graph->filters[i]->filter->query_formats)
 278             ret = filter_query_formats(graph->filters[i]);
 279         else
 280             ret = ff_default_query_formats(graph->filters[i]);
 281         if (ret < 0)
 282             return ret;
 283     }
 284     }
 285
 286     /* go through and merge as many format lists as possible */
 287     for (i = 0; i < graph->filter_count; i++) {
 288         AVFilterContext *filter = graph->filters[i];
 289
 290         for (j = 0; j < filter->nb_inputs; j++) {
 291             AVFilterLink *link = filter->inputs[j];
 292 #if 0
 293             if (!link) continue;
 294
 295             if (!link->in_formats || !link->out_formats)
 296                 return AVERROR(EINVAL);
 297
 298             if (link->type == AVMEDIA_TYPE_VIDEO &&
 299                 !ff_merge_formats(link->in_formats, link->out_formats)) {
 300
 301                 /* couldn't merge format lists, auto-insert scale filter */
 302                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 303                          graph->scale_sws_opts);
 304                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 305                     return ret;
 306             }
 307             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 308                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 309                     return AVERROR(EINVAL);
 310
 311                 /* Merge all three list before checking: that way, in all
 312                  * three categories, aconvert will use a common format
 313                  * whenever possible. */
 314                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
 315                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 316                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 317
 318                 if (!formats || !chlayouts || !samplerates)
 319                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 320                        return ret;
 321 #else
 322             int convert_needed = 0;
 323
 324             if (!link)
 325                 continue;
 326
 327             if (link->in_formats != link->out_formats &&
 328                 !ff_merge_formats(link->in_formats,
 329                                         link->out_formats))
 330                 convert_needed = 1;
 331             if (link->type == AVMEDIA_TYPE_AUDIO) {
 332                 if (link->in_channel_layouts != link->out_channel_layouts &&
 333                     !ff_merge_channel_layouts(link->in_channel_layouts,
 334                                               link->out_channel_layouts))
 335                     convert_needed = 1;
 336                 if (link->in_samplerates != link->out_samplerates &&
 337                     !ff_merge_samplerates(link->in_samplerates,
 338                                           link->out_samplerates))
 339                     convert_needed = 1;
 340             }
 341
 342             if (convert_needed) {
 343                 AVFilterContext *convert;
 344                 AVFilter *filter;
 345                 AVFilterLink *inlink, *outlink;
 346                 char scale_args[256];
 347                 char inst_name[30];
 348
 349                 /* couldn't merge format lists. auto-insert conversion filter */
 350                 switch (link->type) {
 351                 case AVMEDIA_TYPE_VIDEO:
 352                     if (!(filter = avfilter_get_by_name("scale"))) {
 353                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 354                                "not present, cannot convert pixel formats.\n");
 355                         return AVERROR(EINVAL);
 356                     }
 357
 358                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 359                              scaler_count++);
 360                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 361                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 362                                                             inst_name, scale_args, NULL,
 363                                                             graph)) < 0)
 364                         return ret;
 365                     break;
 366                 case AVMEDIA_TYPE_AUDIO:
 367                     if (!(filter = avfilter_get_by_name("aresample"))) {
 368                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 369                                "not present, cannot convert audio formats.\n");
 370                         return AVERROR(EINVAL);
 371                     }
 372
 373                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 374                              resampler_count++);
 375                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 376                                                             inst_name, NULL, NULL, graph)) < 0)
 377                         return ret;
 378                     break;
 379                 default:
 380                     return AVERROR(EINVAL);
 381                 }
 382
 383                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 384                     return ret;
 385
 386                 filter_query_formats(convert);
 387                 inlink  = convert->inputs[0];
 388                 outlink = convert->outputs[0];
 389                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 390                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 391                     ret |= AVERROR(ENOSYS);
 392                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 393                     (!ff_merge_samplerates(inlink->in_samplerates,
 394                                            inlink->out_samplerates) ||
 395                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 396                                                inlink->out_channel_layouts)))
 397                     ret |= AVERROR(ENOSYS);
 398                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 399                     (!ff_merge_samplerates(outlink->in_samplerates,
 400                                            outlink->out_samplerates) ||
 401                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 402                                                outlink->out_channel_layouts)))
 403                     ret |= AVERROR(ENOSYS);
 404
 405                 if (ret < 0) {
 406                     av_log(log_ctx, AV_LOG_ERROR,
 407                            "Impossible to convert between the formats supported by the filter "
 408                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 409                     return ret;
 410                 }
 411 #endif
 412             }
 413         }
 414     }
 415
 416     return 0;
 417 }
 418
 419 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 420 {
 421     if (!link || !link->in_formats)
 422         return 0;
 423
 424     if (link->type == AVMEDIA_TYPE_VIDEO) {
 425         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 426             int has_alpha= av_pix_fmt_descriptors[ref->format].nb_components % 2 == 0;
 427             enum PixelFormat best= PIX_FMT_NONE;
 428             int i;
 429             for (i=0; i<link->in_formats->format_count; i++) {
 430                 enum PixelFormat p = link->in_formats->formats[i];
 431                 best= avcodec_find_best_pix_fmt2(best, p, ref->format, has_alpha, NULL);
 432             }
 433             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 434                    av_get_pix_fmt_name(best), link->in_formats->format_count,
 435                    av_get_pix_fmt_name(ref->format), has_alpha);
 436             link->in_formats->formats[0] = best;
 437         }
 438     }
 439
 440     link->in_formats->format_count = 1;
 441     link->format = link->in_formats->formats[0];
 442
 443     if (link->type == AVMEDIA_TYPE_AUDIO) {
 444         if (!link->in_samplerates->format_count) {
 445             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 446                    " the link between filters %s and %s.\n", link->src->name,
 447                    link->dst->name);
 448             return AVERROR(EINVAL);
 449         }
 450         link->in_samplerates->format_count = 1;
 451         link->sample_rate = link->in_samplerates->formats[0];
 452
 453         if (!link->in_channel_layouts->nb_channel_layouts) {
 454             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 455                    "the link between filters %s and %s.\n", link->src->name,
 456                    link->dst->name);
 457             return AVERROR(EINVAL);
 458         }
 459         link->in_channel_layouts->nb_channel_layouts = 1;
 460         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 461     }
 462
 463     ff_formats_unref(&link->in_formats);
 464     ff_formats_unref(&link->out_formats);
 465     ff_formats_unref(&link->in_samplerates);
 466     ff_formats_unref(&link->out_samplerates);
 467     ff_channel_layouts_unref(&link->in_channel_layouts);
 468     ff_channel_layouts_unref(&link->out_channel_layouts);
 469
 470     return 0;
 471 }
 472
 473 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 474 do {                                                                   \
 475     for (i = 0; i < filter->nb_inputs; i++) {                          \
 476         AVFilterLink *link = filter->inputs[i];                        \
 477         fmt_type fmt;                                                  \
 478                                                                        \
 479         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 480             continue;                                                  \
 481         fmt = link->out_ ## list->var[0];                              \
 482                                                                        \
 483         for (j = 0; j < filter->nb_outputs; j++) {                     \
 484             AVFilterLink *out_link = filter->outputs[j];               \
 485             list_type *fmts;                                           \
 486                                                                        \
 487             if (link->type != out_link->type ||                        \
 488                 out_link->in_ ## list->nb == 1)                        \
 489                 continue;                                              \
 490             fmts = out_link->in_ ## list;                              \
 491                                                                        \
 492             if (!out_link->in_ ## list->nb) {                          \
 493                 add_format(&out_link->in_ ##list, fmt);                \
 494                 break;                                                 \
 495             }                                                          \
 496                                                                        \
 497             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 498                 if (fmts->var[k] == fmt) {                             \
 499                     fmts->var[0]  = fmt;                               \
 500                     fmts->nb = 1;                                      \
 501                     ret = 1;                                           \
 502                     break;                                             \
 503                 }                                                      \
 504         }                                                              \
 505     }                                                                  \
 506 } while (0)
 507
 508 static int reduce_formats_on_filter(AVFilterContext *filter)
 509 {
 510     int i, j, k, ret = 0;
 511
 512     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 513                    format_count, ff_add_format);
 514     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 515                    format_count, ff_add_format);
 516     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
 517                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 518
 519     return ret;
 520 }
 521
 522 static void reduce_formats(AVFilterGraph *graph)
 523 {
 524     int i, reduced;
 525
 526     do {
 527         reduced = 0;
 528
 529         for (i = 0; i < graph->filter_count; i++)
 530             reduced |= reduce_formats_on_filter(graph->filters[i]);
 531     } while (reduced);
 532 }
 533
 534 static void swap_samplerates_on_filter(AVFilterContext *filter)
 535 {
 536     AVFilterLink *link = NULL;
 537     int sample_rate;
 538     int i, j;
 539
 540     for (i = 0; i < filter->nb_inputs; i++) {
 541         link = filter->inputs[i];
 542
 543         if (link->type == AVMEDIA_TYPE_AUDIO &&
 544             link->out_samplerates->format_count == 1)
 545             break;
 546     }
 547     if (i == filter->nb_inputs)
 548         return;
 549
 550     sample_rate = link->out_samplerates->formats[0];
 551
 552     for (i = 0; i < filter->nb_outputs; i++) {
 553         AVFilterLink *outlink = filter->outputs[i];
 554         int best_idx, best_diff = INT_MAX;
 555
 556         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 557             outlink->in_samplerates->format_count < 2)
 558             continue;
 559
 560         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 561             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 562
 563             if (diff < best_diff) {
 564                 best_diff = diff;
 565                 best_idx  = j;
 566             }
 567         }
 568         FFSWAP(int, outlink->in_samplerates->formats[0],
 569                outlink->in_samplerates->formats[best_idx]);
 570     }
 571 }
 572
 573 static void swap_samplerates(AVFilterGraph *graph)
 574 {
 575     int i;
 576
 577     for (i = 0; i < graph->filter_count; i++)
 578         swap_samplerates_on_filter(graph->filters[i]);
 579 }
 580
 581 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 582 {
 583     AVFilterLink *link = NULL;
 584     uint64_t chlayout;
 585     int i, j;
 586
 587     for (i = 0; i < filter->nb_inputs; i++) {
 588         link = filter->inputs[i];
 589
 590         if (link->type == AVMEDIA_TYPE_AUDIO &&
 591             link->out_channel_layouts->nb_channel_layouts == 1)
 592             break;
 593     }
 594     if (i == filter->nb_inputs)
 595         return;
 596
 597     chlayout = link->out_channel_layouts->channel_layouts[0];
 598
 599     for (i = 0; i < filter->nb_outputs; i++) {
 600         AVFilterLink *outlink = filter->outputs[i];
 601         int best_idx, best_score = INT_MIN;
 602
 603         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 604             outlink->in_channel_layouts->nb_channel_layouts < 2)
 605             continue;
 606
 607         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 608             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 609             int matched_channels  = av_get_channel_layout_nb_channels(chlayout &
 610                                                                       out_chlayout);
 611             int extra_channels     = av_get_channel_layout_nb_channels(out_chlayout &
 612                                                                        (~chlayout));
 613             int score = matched_channels - extra_channels;
 614
 615             if (score > best_score) {
 616                 best_score = score;
 617                 best_idx   = j;
 618             }
 619         }
 620         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 621                outlink->in_channel_layouts->channel_layouts[best_idx]);
 622     }
 623
 624 }
 625
 626 static void swap_channel_layouts(AVFilterGraph *graph)
 627 {
 628     int i;
 629
 630     for (i = 0; i < graph->filter_count; i++)
 631         swap_channel_layouts_on_filter(graph->filters[i]);
 632 }
 633
 634 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 635 {
 636     AVFilterLink *link = NULL;
 637     int format, bps;
 638     int i, j;
 639
 640     for (i = 0; i < filter->nb_inputs; i++) {
 641         link = filter->inputs[i];
 642
 643         if (link->type == AVMEDIA_TYPE_AUDIO &&
 644             link->out_formats->format_count == 1)
 645             break;
 646     }
 647     if (i == filter->nb_inputs)
 648         return;
 649
 650     format = link->out_formats->formats[0];
 651     bps    = av_get_bytes_per_sample(format);
 652
 653     for (i = 0; i < filter->nb_outputs; i++) {
 654         AVFilterLink *outlink = filter->outputs[i];
 655         int best_idx = -1, best_score = INT_MIN;
 656
 657         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 658             outlink->in_formats->format_count < 2)
 659             continue;
 660
 661         for (j = 0; j < outlink->in_formats->format_count; j++) {
 662             int out_format = outlink->in_formats->formats[j];
 663             int out_bps    = av_get_bytes_per_sample(out_format);
 664             int score;
 665
 666             if (av_get_packed_sample_fmt(out_format) == format ||
 667                 av_get_planar_sample_fmt(out_format) == format) {
 668                 best_idx   = j;
 669                 break;
 670             }
 671
 672             /* for s32 and float prefer double to prevent loss of information */
 673             if (bps == 4 && out_bps == 8) {
 674                 best_idx = j;
 675                 break;
 676             }
 677
 678             /* prefer closest higher or equal bps */
 679             score = -abs(out_bps - bps);
 680             if (out_bps >= bps)
 681                 score += INT_MAX/2;
 682
 683             if (score > best_score) {
 684                 best_score = score;
 685                 best_idx   = j;
 686             }
 687         }
 688         av_assert0(best_idx >= 0);
 689         FFSWAP(int, outlink->in_formats->formats[0],
 690                outlink->in_formats->formats[best_idx]);
 691     }
 692 }
 693
 694 static void swap_sample_fmts(AVFilterGraph *graph)
 695 {
 696     int i;
 697
 698     for (i = 0; i < graph->filter_count; i++)
 699         swap_sample_fmts_on_filter(graph->filters[i]);
 700
 701 }
 702
 703 static int pick_formats(AVFilterGraph *graph)
 704 {
 705     int i, j, ret;
 706     int change;
 707
 708     do{
 709         change = 0;
 710         for (i = 0; i < graph->filter_count; i++) {
 711             AVFilterContext *filter = graph->filters[i];
 712             if (filter->nb_inputs){
 713                 for (j = 0; j < filter->nb_inputs; j++){
 714                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 715                         pick_format(filter->inputs[j], NULL);
 716                         change = 1;
 717                     }
 718                 }
 719             }
 720             if (filter->nb_outputs){
 721                 for (j = 0; j < filter->nb_outputs; j++){
 722                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 723                         pick_format(filter->outputs[j], NULL);
 724                         change = 1;
 725                     }
 726                 }
 727             }
 728             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 729                 for (j = 0; j < filter->nb_outputs; j++) {
 730                     if(filter->outputs[j]->format<0) {
 731                         pick_format(filter->outputs[j], filter->inputs[0]);
 732                         change = 1;
 733                     }
 734                 }
 735             }
 736         }
 737     }while(change);
 738
 739     for (i = 0; i < graph->filter_count; i++) {
 740         AVFilterContext *filter = graph->filters[i];
 741
 742         for (j = 0; j < filter->nb_inputs; j++)
 743             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 744                 return ret;
 745         for (j = 0; j < filter->nb_outputs; j++)
 746             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 747                 return ret;
 748     }
 749     return 0;
 750 }
 751
 752 /**
 753  * Configure the formats of all the links in the graph.
 754  */
 755 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 756 {
 757     int ret;
 758
 759     /* find supported formats from sub-filters, and merge along links */
 760     if ((ret = query_formats(graph, log_ctx)) < 0)
 761         return ret;
 762
 763     /* Once everything is merged, it's possible that we'll still have
 764      * multiple valid media format choices. We try to minimize the amount
 765      * of format conversion inside filters */
 766     reduce_formats(graph);
 767
 768     /* for audio filters, ensure the best format, sample rate and channel layout
 769      * is selected */
 770     swap_sample_fmts(graph);
 771     swap_samplerates(graph);
 772     swap_channel_layouts(graph);
 773
 774     if ((ret = pick_formats(graph)) < 0)
 775         return ret;
 776
 777     return 0;
 778 }
 779
 780 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 781                                              AVClass *log_ctx)
 782 {
 783     unsigned i, j;
 784     int sink_links_count = 0, n = 0;
 785     AVFilterContext *f;
 786     AVFilterLink **sinks;
 787
 788     for (i = 0; i < graph->filter_count; i++) {
 789         f = graph->filters[i];
 790         for (j = 0; j < f->nb_inputs; j++) {
 791             f->inputs[j]->graph     = graph;
 792             f->inputs[j]->age_index = -1;
 793         }
 794         for (j = 0; j < f->nb_outputs; j++) {
 795             f->outputs[j]->graph    = graph;
 796             f->outputs[j]->age_index= -1;
 797         }
 798         if (!f->nb_outputs) {
 799             if (f->nb_inputs > INT_MAX - sink_links_count)
 800                 return AVERROR(EINVAL);
 801             sink_links_count += f->nb_inputs;
 802         }
 803     }
 804     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 805     if (!sinks)
 806         return AVERROR(ENOMEM);
 807     for (i = 0; i < graph->filter_count; i++) {
 808         f = graph->filters[i];
 809         if (!f->nb_outputs) {
 810             for (j = 0; j < f->nb_inputs; j++) {
 811                 sinks[n] = f->inputs[j];
 812                 f->inputs[j]->age_index = n++;
 813             }
 814         }
 815     }
 816     av_assert0(n == sink_links_count);
 817     graph->sink_links       = sinks;
 818     graph->sink_links_count = sink_links_count;
 819     return 0;
 820 }
 821
 822 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 823 {
 824     AVFilterContext *f;
 825     int i, j, ret;
 826     int fifo_count = 0;
 827
 828     for (i = 0; i < graph->filter_count; i++) {
 829         f = graph->filters[i];
 830
 831         for (j = 0; j < f->nb_inputs; j++) {
 832             AVFilterLink *link = f->inputs[j];
 833             AVFilterContext *fifo_ctx;
 834             AVFilter *fifo;
 835             char name[32];
 836
 837             if (!link->dstpad->needs_fifo)
 838                 continue;
 839
 840             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
 841                    avfilter_get_by_name("fifo") :
 842                    avfilter_get_by_name("afifo");
 843
 844             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
 845
 846             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
 847                                                NULL, graph);
 848             if (ret < 0)
 849                 return ret;
 850
 851             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
 852             if (ret < 0)
 853                 return ret;
 854         }
 855     }
 856
 857     return 0;
 858 }
 859
 860 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 861 {
 862     int ret;
 863
 864     if ((ret = graph_check_validity(graphctx, log_ctx)))
 865         return ret;
 866     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
 867         return ret;
 868     if ((ret = graph_config_formats(graphctx, log_ctx)))
 869         return ret;
 870     if ((ret = graph_config_links(graphctx, log_ctx)))
 871         return ret;
 872     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 873         return ret;
 874
 875     return 0;
 876 }
 877
 878 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 879 {
 880     int i, r = AVERROR(ENOSYS);
 881
 882     if(!graph)
 883         return r;
 884
 885     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 886         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 887         if(r != AVERROR(ENOSYS))
 888             return r;
 889     }
 890
 891     if(res_len && res)
 892         res[0]= 0;
 893
 894     for (i = 0; i < graph->filter_count; i++) {
 895         AVFilterContext *filter = graph->filters[i];
 896         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 897             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 898             if(r != AVERROR(ENOSYS)) {
 899                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 900                     return r;
 901             }
 902         }
 903     }
 904
 905     return r;
 906 }
 907
 908 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 909 {
 910     int i;
 911
 912     if(!graph)
 913         return 0;
 914
 915     for (i = 0; i < graph->filter_count; i++) {
 916         AVFilterContext *filter = graph->filters[i];
 917         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 918             AVFilterCommand **que = &filter->command_queue, *next;
 919             while(*que && (*que)->time <= ts)
 920                 que = &(*que)->next;
 921             next= *que;
 922             *que= av_mallocz(sizeof(AVFilterCommand));
 923             (*que)->command = av_strdup(command);
 924             (*que)->arg     = av_strdup(arg);
 925             (*que)->time    = ts;
 926             (*que)->flags   = flags;
 927             (*que)->next    = next;
 928             if(flags & AVFILTER_CMD_FLAG_ONE)
 929                 return 0;
 930         }
 931     }
 932
 933     return 0;
 934 }
 935
 936 static void heap_bubble_up(AVFilterGraph *graph,
 937                            AVFilterLink *link, int index)
 938 {
 939     AVFilterLink **links = graph->sink_links;
 940
 941     while (index) {
 942         int parent = (index - 1) >> 1;
 943         if (links[parent]->current_pts >= link->current_pts)
 944             break;
 945         links[index] = links[parent];
 946         links[index]->age_index = index;
 947         index = parent;
 948     }
 949     links[index] = link;
 950     link->age_index = index;
 951 }
 952
 953 static void heap_bubble_down(AVFilterGraph *graph,
 954                              AVFilterLink *link, int index)
 955 {
 956     AVFilterLink **links = graph->sink_links;
 957
 958     while (1) {
 959         int child = 2 * index + 1;
 960         if (child >= graph->sink_links_count)
 961             break;
 962         if (child + 1 < graph->sink_links_count &&
 963             links[child + 1]->current_pts < links[child]->current_pts)
 964             child++;
 965         if (link->current_pts < links[child]->current_pts)
 966             break;
 967         links[index] = links[child];
 968         links[index]->age_index = index;
 969         index = child;
 970     }
 971     links[index] = link;
 972     link->age_index = index;
 973 }
 974
 975 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
 976 {
 977     heap_bubble_up  (graph, link, link->age_index);
 978     heap_bubble_down(graph, link, link->age_index);
 979 }
 980
 981
 982 int avfilter_graph_request_oldest(AVFilterGraph *graph)
 983 {
 984     while (graph->sink_links_count) {
 985         AVFilterLink *oldest = graph->sink_links[0];
 986         int r = ff_request_frame(oldest);
 987         if (r != AVERROR_EOF)
 988             return r;
 989         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
 990                oldest->dst ? oldest->dst->name : "unknown",
 991                oldest->dstpad ? oldest->dstpad->name : "unknown");
 992         /* EOF: remove the link from the heap */
 993         if (oldest->age_index < --graph->sink_links_count)
 994             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
 995                              oldest->age_index);
 996         oldest->age_index = -1;
 997     }
 998     return AVERROR_EOF;
 999 }