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 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 582 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 583 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 584 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 585 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 586 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 587 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 588
 589 /* allowable substitutions for channel pairs when comparing layouts,
 590  * ordered by priority for both values */
 591 static const uint64_t ch_subst[][2] = {
 592     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 593     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 594     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 595     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 596     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 597     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 598     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 599     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 600     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 601     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 602     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 603     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 604     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 605     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 606     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 607     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 608     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 609     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 610     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 611     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 612     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 613 };
 614
 615 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 616 {
 617     AVFilterLink *link = NULL;
 618     int i, j, k;
 619
 620     for (i = 0; i < filter->nb_inputs; i++) {
 621         link = filter->inputs[i];
 622
 623         if (link->type == AVMEDIA_TYPE_AUDIO &&
 624             link->out_channel_layouts->nb_channel_layouts == 1)
 625             break;
 626     }
 627     if (i == filter->nb_inputs)
 628         return;
 629
 630     for (i = 0; i < filter->nb_outputs; i++) {
 631         AVFilterLink *outlink = filter->outputs[i];
 632         int best_idx, best_score = INT_MIN, best_count_diff = INT_MAX;
 633
 634         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 635             outlink->in_channel_layouts->nb_channel_layouts < 2)
 636             continue;
 637
 638         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 639             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 640             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 641             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 642             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 643             int count_diff        = out_channels - in_channels;
 644             int matched_channels, extra_channels;
 645             int score = 0;
 646
 647             /* channel substitution */
 648             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 649                 uint64_t cmp0 = ch_subst[k][0];
 650                 uint64_t cmp1 = ch_subst[k][1];
 651                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 652                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 653                     in_chlayout  &= ~cmp0;
 654                     out_chlayout &= ~cmp1;
 655                     /* add score for channel match, minus a deduction for
 656                        having to do the substitution */
 657                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 658                 }
 659             }
 660
 661             /* no penalty for LFE channel mismatch */
 662             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 663                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 664                 score += 10;
 665             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 666             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 667
 668             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 669                                                                  out_chlayout);
 670             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 671                                                                  (~in_chlayout));
 672             score += 10 * matched_channels - 5 * extra_channels;
 673
 674             if (score > best_score ||
 675                 (count_diff < best_count_diff && score == best_score)) {
 676                 best_score = score;
 677                 best_idx   = j;
 678                 best_count_diff = count_diff;
 679             }
 680         }
 681         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 682                outlink->in_channel_layouts->channel_layouts[best_idx]);
 683     }
 684
 685 }
 686
 687 static void swap_channel_layouts(AVFilterGraph *graph)
 688 {
 689     int i;
 690
 691     for (i = 0; i < graph->filter_count; i++)
 692         swap_channel_layouts_on_filter(graph->filters[i]);
 693 }
 694
 695 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 696 {
 697     AVFilterLink *link = NULL;
 698     int format, bps;
 699     int i, j;
 700
 701     for (i = 0; i < filter->nb_inputs; i++) {
 702         link = filter->inputs[i];
 703
 704         if (link->type == AVMEDIA_TYPE_AUDIO &&
 705             link->out_formats->format_count == 1)
 706             break;
 707     }
 708     if (i == filter->nb_inputs)
 709         return;
 710
 711     format = link->out_formats->formats[0];
 712     bps    = av_get_bytes_per_sample(format);
 713
 714     for (i = 0; i < filter->nb_outputs; i++) {
 715         AVFilterLink *outlink = filter->outputs[i];
 716         int best_idx = -1, best_score = INT_MIN;
 717
 718         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 719             outlink->in_formats->format_count < 2)
 720             continue;
 721
 722         for (j = 0; j < outlink->in_formats->format_count; j++) {
 723             int out_format = outlink->in_formats->formats[j];
 724             int out_bps    = av_get_bytes_per_sample(out_format);
 725             int score;
 726
 727             if (av_get_packed_sample_fmt(out_format) == format ||
 728                 av_get_planar_sample_fmt(out_format) == format) {
 729                 best_idx   = j;
 730                 break;
 731             }
 732
 733             /* for s32 and float prefer double to prevent loss of information */
 734             if (bps == 4 && out_bps == 8) {
 735                 best_idx = j;
 736                 break;
 737             }
 738
 739             /* prefer closest higher or equal bps */
 740             score = -abs(out_bps - bps);
 741             if (out_bps >= bps)
 742                 score += INT_MAX/2;
 743
 744             if (score > best_score) {
 745                 best_score = score;
 746                 best_idx   = j;
 747             }
 748         }
 749         av_assert0(best_idx >= 0);
 750         FFSWAP(int, outlink->in_formats->formats[0],
 751                outlink->in_formats->formats[best_idx]);
 752     }
 753 }
 754
 755 static void swap_sample_fmts(AVFilterGraph *graph)
 756 {
 757     int i;
 758
 759     for (i = 0; i < graph->filter_count; i++)
 760         swap_sample_fmts_on_filter(graph->filters[i]);
 761
 762 }
 763
 764 static int pick_formats(AVFilterGraph *graph)
 765 {
 766     int i, j, ret;
 767     int change;
 768
 769     do{
 770         change = 0;
 771         for (i = 0; i < graph->filter_count; i++) {
 772             AVFilterContext *filter = graph->filters[i];
 773             if (filter->nb_inputs){
 774                 for (j = 0; j < filter->nb_inputs; j++){
 775                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 776                         pick_format(filter->inputs[j], NULL);
 777                         change = 1;
 778                     }
 779                 }
 780             }
 781             if (filter->nb_outputs){
 782                 for (j = 0; j < filter->nb_outputs; j++){
 783                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 784                         pick_format(filter->outputs[j], NULL);
 785                         change = 1;
 786                     }
 787                 }
 788             }
 789             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 790                 for (j = 0; j < filter->nb_outputs; j++) {
 791                     if(filter->outputs[j]->format<0) {
 792                         pick_format(filter->outputs[j], filter->inputs[0]);
 793                         change = 1;
 794                     }
 795                 }
 796             }
 797         }
 798     }while(change);
 799
 800     for (i = 0; i < graph->filter_count; i++) {
 801         AVFilterContext *filter = graph->filters[i];
 802
 803         for (j = 0; j < filter->nb_inputs; j++)
 804             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 805                 return ret;
 806         for (j = 0; j < filter->nb_outputs; j++)
 807             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 808                 return ret;
 809     }
 810     return 0;
 811 }
 812
 813 /**
 814  * Configure the formats of all the links in the graph.
 815  */
 816 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 817 {
 818     int ret;
 819
 820     /* find supported formats from sub-filters, and merge along links */
 821     if ((ret = query_formats(graph, log_ctx)) < 0)
 822         return ret;
 823
 824     /* Once everything is merged, it's possible that we'll still have
 825      * multiple valid media format choices. We try to minimize the amount
 826      * of format conversion inside filters */
 827     reduce_formats(graph);
 828
 829     /* for audio filters, ensure the best format, sample rate and channel layout
 830      * is selected */
 831     swap_sample_fmts(graph);
 832     swap_samplerates(graph);
 833     swap_channel_layouts(graph);
 834
 835     if ((ret = pick_formats(graph)) < 0)
 836         return ret;
 837
 838     return 0;
 839 }
 840
 841 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 842                                              AVClass *log_ctx)
 843 {
 844     unsigned i, j;
 845     int sink_links_count = 0, n = 0;
 846     AVFilterContext *f;
 847     AVFilterLink **sinks;
 848
 849     for (i = 0; i < graph->filter_count; i++) {
 850         f = graph->filters[i];
 851         for (j = 0; j < f->nb_inputs; j++) {
 852             f->inputs[j]->graph     = graph;
 853             f->inputs[j]->age_index = -1;
 854         }
 855         for (j = 0; j < f->nb_outputs; j++) {
 856             f->outputs[j]->graph    = graph;
 857             f->outputs[j]->age_index= -1;
 858         }
 859         if (!f->nb_outputs) {
 860             if (f->nb_inputs > INT_MAX - sink_links_count)
 861                 return AVERROR(EINVAL);
 862             sink_links_count += f->nb_inputs;
 863         }
 864     }
 865     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 866     if (!sinks)
 867         return AVERROR(ENOMEM);
 868     for (i = 0; i < graph->filter_count; i++) {
 869         f = graph->filters[i];
 870         if (!f->nb_outputs) {
 871             for (j = 0; j < f->nb_inputs; j++) {
 872                 sinks[n] = f->inputs[j];
 873                 f->inputs[j]->age_index = n++;
 874             }
 875         }
 876     }
 877     av_assert0(n == sink_links_count);
 878     graph->sink_links       = sinks;
 879     graph->sink_links_count = sink_links_count;
 880     return 0;
 881 }
 882
 883 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 884 {
 885     AVFilterContext *f;
 886     int i, j, ret;
 887     int fifo_count = 0;
 888
 889     for (i = 0; i < graph->filter_count; i++) {
 890         f = graph->filters[i];
 891
 892         for (j = 0; j < f->nb_inputs; j++) {
 893             AVFilterLink *link = f->inputs[j];
 894             AVFilterContext *fifo_ctx;
 895             AVFilter *fifo;
 896             char name[32];
 897
 898             if (!link->dstpad->needs_fifo)
 899                 continue;
 900
 901             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
 902                    avfilter_get_by_name("fifo") :
 903                    avfilter_get_by_name("afifo");
 904
 905             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
 906
 907             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
 908                                                NULL, graph);
 909             if (ret < 0)
 910                 return ret;
 911
 912             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
 913             if (ret < 0)
 914                 return ret;
 915         }
 916     }
 917
 918     return 0;
 919 }
 920
 921 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 922 {
 923     int ret;
 924
 925     if ((ret = graph_check_validity(graphctx, log_ctx)))
 926         return ret;
 927     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
 928         return ret;
 929     if ((ret = graph_config_formats(graphctx, log_ctx)))
 930         return ret;
 931     if ((ret = graph_config_links(graphctx, log_ctx)))
 932         return ret;
 933     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 934         return ret;
 935
 936     return 0;
 937 }
 938
 939 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 940 {
 941     int i, r = AVERROR(ENOSYS);
 942
 943     if(!graph)
 944         return r;
 945
 946     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 947         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 948         if(r != AVERROR(ENOSYS))
 949             return r;
 950     }
 951
 952     if(res_len && res)
 953         res[0]= 0;
 954
 955     for (i = 0; i < graph->filter_count; i++) {
 956         AVFilterContext *filter = graph->filters[i];
 957         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 958             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 959             if(r != AVERROR(ENOSYS)) {
 960                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 961                     return r;
 962             }
 963         }
 964     }
 965
 966     return r;
 967 }
 968
 969 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 970 {
 971     int i;
 972
 973     if(!graph)
 974         return 0;
 975
 976     for (i = 0; i < graph->filter_count; i++) {
 977         AVFilterContext *filter = graph->filters[i];
 978         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 979             AVFilterCommand **que = &filter->command_queue, *next;
 980             while(*que && (*que)->time <= ts)
 981                 que = &(*que)->next;
 982             next= *que;
 983             *que= av_mallocz(sizeof(AVFilterCommand));
 984             (*que)->command = av_strdup(command);
 985             (*que)->arg     = av_strdup(arg);
 986             (*que)->time    = ts;
 987             (*que)->flags   = flags;
 988             (*que)->next    = next;
 989             if(flags & AVFILTER_CMD_FLAG_ONE)
 990                 return 0;
 991         }
 992     }
 993
 994     return 0;
 995 }
 996
 997 static void heap_bubble_up(AVFilterGraph *graph,
 998                            AVFilterLink *link, int index)
 999 {
1000     AVFilterLink **links = graph->sink_links;
1001
1002     while (index) {
1003         int parent = (index - 1) >> 1;
1004         if (links[parent]->current_pts >= link->current_pts)
1005             break;
1006         links[index] = links[parent];
1007         links[index]->age_index = index;
1008         index = parent;
1009     }
1010     links[index] = link;
1011     link->age_index = index;
1012 }
1013
1014 static void heap_bubble_down(AVFilterGraph *graph,
1015                              AVFilterLink *link, int index)
1016 {
1017     AVFilterLink **links = graph->sink_links;
1018
1019     while (1) {
1020         int child = 2 * index + 1;
1021         if (child >= graph->sink_links_count)
1022             break;
1023         if (child + 1 < graph->sink_links_count &&
1024             links[child + 1]->current_pts < links[child]->current_pts)
1025             child++;
1026         if (link->current_pts < links[child]->current_pts)
1027             break;
1028         links[index] = links[child];
1029         links[index]->age_index = index;
1030         index = child;
1031     }
1032     links[index] = link;
1033     link->age_index = index;
1034 }
1035
1036 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1037 {
1038     heap_bubble_up  (graph, link, link->age_index);
1039     heap_bubble_down(graph, link, link->age_index);
1040 }
1041
1042
1043 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1044 {
1045     while (graph->sink_links_count) {
1046         AVFilterLink *oldest = graph->sink_links[0];
1047         int r = ff_request_frame(oldest);
1048         if (r != AVERROR_EOF)
1049             return r;
1050         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1051                oldest->dst ? oldest->dst->name : "unknown",
1052                oldest->dstpad ? oldest->dstpad->name : "unknown");
1053         /* EOF: remove the link from the heap */
1054         if (oldest->age_index < --graph->sink_links_count)
1055             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1056                              oldest->age_index);
1057         oldest->age_index = -1;
1058     }
1059     return AVERROR_EOF;
1060 }