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

   1 /*
   2  * filter graphs
   3  * Copyright (c) 2008 Vitor Sessak
   4  * Copyright (c) 2007 Bobby Bingham
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <ctype.h>
  24 #include <string.h>
  25
  26 #include "libavutil/avassert.h"
  27 #include "libavutil/channel_layout.h"
  28 #include "libavutil/opt.h"
  29 #include "libavutil/pixdesc.h"
  30 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
  31 #include "avfilter.h"
  32 #include "avfiltergraph.h"
  33 #include "formats.h"
  34 #include "internal.h"
  35
  36 #define OFFSET(x) offsetof(AVFilterGraph,x)
  37
  38 static const AVOption options[]={
  39 {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
  40 {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
  41 {0}
  42 };
  43
  44
  45 static const AVClass filtergraph_class = {
  46     .class_name = "AVFilterGraph",
  47     .item_name  = av_default_item_name,
  48     .option     = options,
  49     .version    = LIBAVUTIL_VERSION_INT,
  50     .category   = AV_CLASS_CATEGORY_FILTER,
  51 };
  52
  53 AVFilterGraph *avfilter_graph_alloc(void)
  54 {
  55     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  56     if (!ret)
  57         return NULL;
  58     ret->av_class = &filtergraph_class;
  59     return ret;
  60 }
  61
  62 void avfilter_graph_free(AVFilterGraph **graph)
  63 {
  64     if (!*graph)
  65         return;
  66     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  67         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  68     av_freep(&(*graph)->sink_links);
  69     av_freep(&(*graph)->scale_sws_opts);
  70     av_freep(&(*graph)->aresample_swr_opts);
  71     av_freep(&(*graph)->filters);
  72     av_freep(graph);
  73 }
  74
  75 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  76 {
  77     AVFilterContext **filters = av_realloc(graph->filters,
  78                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  79     if (!filters)
  80         return AVERROR(ENOMEM);
  81
  82     graph->filters = filters;
  83     graph->filters[graph->filter_count++] = filter;
  84
  85     return 0;
  86 }
  87
  88 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  89                                  const char *name, const char *args, void *opaque,
  90                                  AVFilterGraph *graph_ctx)
  91 {
  92     int ret;
  93
  94     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  95         goto fail;
  96     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  97         goto fail;
  98     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  99         goto fail;
 100     return 0;
 101
 102 fail:
 103     if (*filt_ctx)
 104         avfilter_free(*filt_ctx);
 105     *filt_ctx = NULL;
 106     return ret;
 107 }
 108
 109 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
 110 {
 111     graph->disable_auto_convert = flags;
 112 }
 113
 114 /**
 115  * Check for the validity of graph.
 116  *
 117  * A graph is considered valid if all its input and output pads are
 118  * connected.
 119  *
 120  * @return 0 in case of success, a negative value otherwise
 121  */
 122 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 123 {
 124     AVFilterContext *filt;
 125     int i, j;
 126
 127     for (i = 0; i < graph->filter_count; i++) {
 128         const AVFilterPad *pad;
 129         filt = graph->filters[i];
 130
 131         for (j = 0; j < filt->nb_inputs; j++) {
 132             if (!filt->inputs[j] || !filt->inputs[j]->src) {
 133                 pad = &filt->input_pads[j];
 134                 av_log(log_ctx, AV_LOG_ERROR,
 135                        "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
 136                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 137                 return AVERROR(EINVAL);
 138             }
 139         }
 140
 141         for (j = 0; j < filt->nb_outputs; j++) {
 142             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 143                 pad = &filt->output_pads[j];
 144                 av_log(log_ctx, AV_LOG_ERROR,
 145                        "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
 146                        pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
 147                 return AVERROR(EINVAL);
 148             }
 149         }
 150     }
 151
 152     return 0;
 153 }
 154
 155 /**
 156  * Configure all the links of graphctx.
 157  *
 158  * @return 0 in case of success, a negative value otherwise
 159  */
 160 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 161 {
 162     AVFilterContext *filt;
 163     int i, ret;
 164
 165     for (i=0; i < graph->filter_count; i++) {
 166         filt = graph->filters[i];
 167
 168         if (!filt->nb_outputs) {
 169             if ((ret = avfilter_config_links(filt)))
 170                 return ret;
 171         }
 172     }
 173
 174     return 0;
 175 }
 176
 177 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 178 {
 179     int i;
 180
 181     for (i = 0; i < graph->filter_count; i++)
 182         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 183             return graph->filters[i];
 184
 185     return NULL;
 186 }
 187
 188 static int filter_query_formats(AVFilterContext *ctx)
 189 {
 190     int ret;
 191     AVFilterFormats *formats;
 192     AVFilterChannelLayouts *chlayouts;
 193     AVFilterFormats *samplerates;
 194     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 195                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 196                             AVMEDIA_TYPE_VIDEO;
 197
 198     if ((ret = ctx->filter->query_formats(ctx)) < 0)
 199         return ret;
 200
 201     formats = ff_all_formats(type);
 202     if (!formats)
 203         return AVERROR(ENOMEM);
 204     ff_set_common_formats(ctx, formats);
 205     if (type == AVMEDIA_TYPE_AUDIO) {
 206         samplerates = ff_all_samplerates();
 207         if (!samplerates)
 208             return AVERROR(ENOMEM);
 209         ff_set_common_samplerates(ctx, samplerates);
 210         chlayouts = ff_all_channel_layouts();
 211         if (!chlayouts)
 212             return AVERROR(ENOMEM);
 213         ff_set_common_channel_layouts(ctx, chlayouts);
 214     }
 215     return 0;
 216 }
 217
 218 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 219                               const char *filt_name, const char *filt_args)
 220 {
 221     static int auto_count = 0, ret;
 222     char inst_name[32];
 223     AVFilterContext *filt_ctx;
 224
 225     if (graph->disable_auto_convert) {
 226         av_log(NULL, AV_LOG_ERROR,
 227                "The filters '%s' and '%s' do not have a common format "
 228                "and automatic conversion is disabled.\n",
 229                link->src->name, link->dst->name);
 230         return AVERROR(EINVAL);
 231     }
 232
 233     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 234             filt_name, auto_count++);
 235
 236     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 237                                             avfilter_get_by_name(filt_name),
 238                                             inst_name, filt_args, NULL, graph)) < 0)
 239         return ret;
 240     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 241         return ret;
 242
 243     filter_query_formats(filt_ctx);
 244
 245     if ( ((link = filt_ctx-> inputs[0]) &&
 246            !ff_merge_formats(link->in_formats, link->out_formats)) ||
 247          ((link = filt_ctx->outputs[0]) &&
 248            !ff_merge_formats(link->in_formats, link->out_formats))
 249        ) {
 250         av_log(NULL, AV_LOG_ERROR,
 251                "Impossible to convert between the 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     if (link->type == AVMEDIA_TYPE_AUDIO &&
 257          (((link = filt_ctx-> inputs[0]) &&
 258            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 259          ((link = filt_ctx->outputs[0]) &&
 260            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 261        ) {
 262         av_log(NULL, AV_LOG_ERROR,
 263                "Impossible to convert between the channel layouts formats supported by the filter "
 264                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 265         return AVERROR(EINVAL);
 266     }
 267
 268     return 0;
 269 }
 270
 271 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 272 {
 273     int i, j, ret;
 274     char filt_args[128];
 275     AVFilterFormats *formats;
 276     AVFilterChannelLayouts *chlayouts;
 277     AVFilterFormats *samplerates;
 278     int scaler_count = 0, resampler_count = 0;
 279
 280     for (j = 0; j < 2; j++) {
 281     /* ask all the sub-filters for their supported media formats */
 282     for (i = 0; i < graph->filter_count; i++) {
 283         /* Call query_formats on sources first.
 284            This is a temporary workaround for amerge,
 285            until format renegociation is implemented. */
 286         if (!graph->filters[i]->nb_inputs == j)
 287             continue;
 288         if (graph->filters[i]->filter->query_formats)
 289             ret = filter_query_formats(graph->filters[i]);
 290         else
 291             ret = ff_default_query_formats(graph->filters[i]);
 292         if (ret < 0)
 293             return ret;
 294     }
 295     }
 296
 297     /* go through and merge as many format lists as possible */
 298     for (i = 0; i < graph->filter_count; i++) {
 299         AVFilterContext *filter = graph->filters[i];
 300
 301         for (j = 0; j < filter->nb_inputs; j++) {
 302             AVFilterLink *link = filter->inputs[j];
 303 #if 0
 304             if (!link) continue;
 305
 306             if (!link->in_formats || !link->out_formats)
 307                 return AVERROR(EINVAL);
 308
 309             if (link->type == AVMEDIA_TYPE_VIDEO &&
 310                 !ff_merge_formats(link->in_formats, link->out_formats)) {
 311
 312                 /* couldn't merge format lists, auto-insert scale filter */
 313                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 314                          graph->scale_sws_opts);
 315                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 316                     return ret;
 317             }
 318             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 319                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 320                     return AVERROR(EINVAL);
 321
 322                 /* Merge all three list before checking: that way, in all
 323                  * three categories, aconvert will use a common format
 324                  * whenever possible. */
 325                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
 326                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 327                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 328
 329                 if (!formats || !chlayouts || !samplerates)
 330                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 331                        return ret;
 332 #else
 333             int convert_needed = 0;
 334
 335             if (!link)
 336                 continue;
 337
 338             if (link->in_formats != link->out_formats &&
 339                 !ff_merge_formats(link->in_formats,
 340                                         link->out_formats))
 341                 convert_needed = 1;
 342             if (link->type == AVMEDIA_TYPE_AUDIO) {
 343                 if (link->in_channel_layouts != link->out_channel_layouts &&
 344                     !ff_merge_channel_layouts(link->in_channel_layouts,
 345                                               link->out_channel_layouts))
 346                     convert_needed = 1;
 347                 if (link->in_samplerates != link->out_samplerates &&
 348                     !ff_merge_samplerates(link->in_samplerates,
 349                                           link->out_samplerates))
 350                     convert_needed = 1;
 351             }
 352
 353             if (convert_needed) {
 354                 AVFilterContext *convert;
 355                 AVFilter *filter;
 356                 AVFilterLink *inlink, *outlink;
 357                 char scale_args[256];
 358                 char inst_name[30];
 359
 360                 /* couldn't merge format lists. auto-insert conversion filter */
 361                 switch (link->type) {
 362                 case AVMEDIA_TYPE_VIDEO:
 363                     if (!(filter = avfilter_get_by_name("scale"))) {
 364                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 365                                "not present, cannot convert pixel formats.\n");
 366                         return AVERROR(EINVAL);
 367                     }
 368
 369                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 370                              scaler_count++);
 371                     if (graph->scale_sws_opts)
 372                         snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 373                     else
 374                         snprintf(scale_args, sizeof(scale_args), "0:0");
 375
 376                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 377                                                             inst_name, scale_args, NULL,
 378                                                             graph)) < 0)
 379                         return ret;
 380                     break;
 381                 case AVMEDIA_TYPE_AUDIO:
 382                     if (!(filter = avfilter_get_by_name("aresample"))) {
 383                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 384                                "not present, cannot convert audio formats.\n");
 385                         return AVERROR(EINVAL);
 386                     }
 387
 388                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 389                              resampler_count++);
 390                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 391                                                             inst_name, graph->aresample_swr_opts, NULL, graph)) < 0)
 392                         return ret;
 393                     break;
 394                 default:
 395                     return AVERROR(EINVAL);
 396                 }
 397
 398                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 399                     return ret;
 400
 401                 filter_query_formats(convert);
 402                 inlink  = convert->inputs[0];
 403                 outlink = convert->outputs[0];
 404                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 405                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 406                     ret |= AVERROR(ENOSYS);
 407                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 408                     (!ff_merge_samplerates(inlink->in_samplerates,
 409                                            inlink->out_samplerates) ||
 410                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 411                                                inlink->out_channel_layouts)))
 412                     ret |= AVERROR(ENOSYS);
 413                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 414                     (!ff_merge_samplerates(outlink->in_samplerates,
 415                                            outlink->out_samplerates) ||
 416                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 417                                                outlink->out_channel_layouts)))
 418                     ret |= AVERROR(ENOSYS);
 419
 420                 if (ret < 0) {
 421                     av_log(log_ctx, AV_LOG_ERROR,
 422                            "Impossible to convert between the formats supported by the filter "
 423                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 424                     return ret;
 425                 }
 426 #endif
 427             }
 428         }
 429     }
 430
 431     return 0;
 432 }
 433
 434 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 435 {
 436     if (!link || !link->in_formats)
 437         return 0;
 438
 439     if (link->type == AVMEDIA_TYPE_VIDEO) {
 440         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 441             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 442             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 443             int i;
 444             for (i=0; i<link->in_formats->format_count; i++) {
 445                 enum AVPixelFormat p = link->in_formats->formats[i];
 446                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 447             }
 448             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 449                    av_get_pix_fmt_name(best), link->in_formats->format_count,
 450                    av_get_pix_fmt_name(ref->format), has_alpha);
 451             link->in_formats->formats[0] = best;
 452         }
 453     }
 454
 455     link->in_formats->format_count = 1;
 456     link->format = link->in_formats->formats[0];
 457
 458     if (link->type == AVMEDIA_TYPE_AUDIO) {
 459         if (!link->in_samplerates->format_count) {
 460             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 461                    " the link between filters %s and %s.\n", link->src->name,
 462                    link->dst->name);
 463             return AVERROR(EINVAL);
 464         }
 465         link->in_samplerates->format_count = 1;
 466         link->sample_rate = link->in_samplerates->formats[0];
 467
 468         if (!link->in_channel_layouts->nb_channel_layouts) {
 469             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 470                    "the link between filters %s and %s.\n", link->src->name,
 471                    link->dst->name);
 472             return AVERROR(EINVAL);
 473         }
 474         link->in_channel_layouts->nb_channel_layouts = 1;
 475         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 476     }
 477
 478     ff_formats_unref(&link->in_formats);
 479     ff_formats_unref(&link->out_formats);
 480     ff_formats_unref(&link->in_samplerates);
 481     ff_formats_unref(&link->out_samplerates);
 482     ff_channel_layouts_unref(&link->in_channel_layouts);
 483     ff_channel_layouts_unref(&link->out_channel_layouts);
 484
 485     return 0;
 486 }
 487
 488 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 489 do {                                                                   \
 490     for (i = 0; i < filter->nb_inputs; i++) {                          \
 491         AVFilterLink *link = filter->inputs[i];                        \
 492         fmt_type fmt;                                                  \
 493                                                                        \
 494         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 495             continue;                                                  \
 496         fmt = link->out_ ## list->var[0];                              \
 497                                                                        \
 498         for (j = 0; j < filter->nb_outputs; j++) {                     \
 499             AVFilterLink *out_link = filter->outputs[j];               \
 500             list_type *fmts;                                           \
 501                                                                        \
 502             if (link->type != out_link->type ||                        \
 503                 out_link->in_ ## list->nb == 1)                        \
 504                 continue;                                              \
 505             fmts = out_link->in_ ## list;                              \
 506                                                                        \
 507             if (!out_link->in_ ## list->nb) {                          \
 508                 add_format(&out_link->in_ ##list, fmt);                \
 509                 break;                                                 \
 510             }                                                          \
 511                                                                        \
 512             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 513                 if (fmts->var[k] == fmt) {                             \
 514                     fmts->var[0]  = fmt;                               \
 515                     fmts->nb = 1;                                      \
 516                     ret = 1;                                           \
 517                     break;                                             \
 518                 }                                                      \
 519         }                                                              \
 520     }                                                                  \
 521 } while (0)
 522
 523 static int reduce_formats_on_filter(AVFilterContext *filter)
 524 {
 525     int i, j, k, ret = 0;
 526
 527     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 528                    format_count, ff_add_format);
 529     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 530                    format_count, ff_add_format);
 531     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
 532                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 533
 534     return ret;
 535 }
 536
 537 static void reduce_formats(AVFilterGraph *graph)
 538 {
 539     int i, reduced;
 540
 541     do {
 542         reduced = 0;
 543
 544         for (i = 0; i < graph->filter_count; i++)
 545             reduced |= reduce_formats_on_filter(graph->filters[i]);
 546     } while (reduced);
 547 }
 548
 549 static void swap_samplerates_on_filter(AVFilterContext *filter)
 550 {
 551     AVFilterLink *link = NULL;
 552     int sample_rate;
 553     int i, j;
 554
 555     for (i = 0; i < filter->nb_inputs; i++) {
 556         link = filter->inputs[i];
 557
 558         if (link->type == AVMEDIA_TYPE_AUDIO &&
 559             link->out_samplerates->format_count == 1)
 560             break;
 561     }
 562     if (i == filter->nb_inputs)
 563         return;
 564
 565     sample_rate = link->out_samplerates->formats[0];
 566
 567     for (i = 0; i < filter->nb_outputs; i++) {
 568         AVFilterLink *outlink = filter->outputs[i];
 569         int best_idx, best_diff = INT_MAX;
 570
 571         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 572             outlink->in_samplerates->format_count < 2)
 573             continue;
 574
 575         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 576             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 577
 578             if (diff < best_diff) {
 579                 best_diff = diff;
 580                 best_idx  = j;
 581             }
 582         }
 583         FFSWAP(int, outlink->in_samplerates->formats[0],
 584                outlink->in_samplerates->formats[best_idx]);
 585     }
 586 }
 587
 588 static void swap_samplerates(AVFilterGraph *graph)
 589 {
 590     int i;
 591
 592     for (i = 0; i < graph->filter_count; i++)
 593         swap_samplerates_on_filter(graph->filters[i]);
 594 }
 595
 596 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 597 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 598 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 599 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 600 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 601 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 602 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 603
 604 /* allowable substitutions for channel pairs when comparing layouts,
 605  * ordered by priority for both values */
 606 static const uint64_t ch_subst[][2] = {
 607     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 608     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 609     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 610     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 611     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 612     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 613     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 614     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 615     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 616     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 617     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 618     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 619     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 620     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 621     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 622     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 623     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 624     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 625     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 626     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 627     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 628 };
 629
 630 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 631 {
 632     AVFilterLink *link = NULL;
 633     int i, j, k;
 634
 635     for (i = 0; i < filter->nb_inputs; i++) {
 636         link = filter->inputs[i];
 637
 638         if (link->type == AVMEDIA_TYPE_AUDIO &&
 639             link->out_channel_layouts->nb_channel_layouts == 1)
 640             break;
 641     }
 642     if (i == filter->nb_inputs)
 643         return;
 644
 645     for (i = 0; i < filter->nb_outputs; i++) {
 646         AVFilterLink *outlink = filter->outputs[i];
 647         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 648
 649         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 650             outlink->in_channel_layouts->nb_channel_layouts < 2)
 651             continue;
 652
 653         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 654             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 655             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 656             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 657             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 658             int count_diff        = out_channels - in_channels;
 659             int matched_channels, extra_channels;
 660             int score = 0;
 661
 662             /* channel substitution */
 663             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 664                 uint64_t cmp0 = ch_subst[k][0];
 665                 uint64_t cmp1 = ch_subst[k][1];
 666                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 667                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 668                     in_chlayout  &= ~cmp0;
 669                     out_chlayout &= ~cmp1;
 670                     /* add score for channel match, minus a deduction for
 671                        having to do the substitution */
 672                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 673                 }
 674             }
 675
 676             /* no penalty for LFE channel mismatch */
 677             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 678                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 679                 score += 10;
 680             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 681             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 682
 683             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 684                                                                  out_chlayout);
 685             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 686                                                                  (~in_chlayout));
 687             score += 10 * matched_channels - 5 * extra_channels;
 688
 689             if (score > best_score ||
 690                 (count_diff < best_count_diff && score == best_score)) {
 691                 best_score = score;
 692                 best_idx   = j;
 693                 best_count_diff = count_diff;
 694             }
 695         }
 696         av_assert0(best_idx >= 0);
 697         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 698                outlink->in_channel_layouts->channel_layouts[best_idx]);
 699     }
 700
 701 }
 702
 703 static void swap_channel_layouts(AVFilterGraph *graph)
 704 {
 705     int i;
 706
 707     for (i = 0; i < graph->filter_count; i++)
 708         swap_channel_layouts_on_filter(graph->filters[i]);
 709 }
 710
 711 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 712 {
 713     AVFilterLink *link = NULL;
 714     int format, bps;
 715     int i, j;
 716
 717     for (i = 0; i < filter->nb_inputs; i++) {
 718         link = filter->inputs[i];
 719
 720         if (link->type == AVMEDIA_TYPE_AUDIO &&
 721             link->out_formats->format_count == 1)
 722             break;
 723     }
 724     if (i == filter->nb_inputs)
 725         return;
 726
 727     format = link->out_formats->formats[0];
 728     bps    = av_get_bytes_per_sample(format);
 729
 730     for (i = 0; i < filter->nb_outputs; i++) {
 731         AVFilterLink *outlink = filter->outputs[i];
 732         int best_idx = -1, best_score = INT_MIN;
 733
 734         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 735             outlink->in_formats->format_count < 2)
 736             continue;
 737
 738         for (j = 0; j < outlink->in_formats->format_count; j++) {
 739             int out_format = outlink->in_formats->formats[j];
 740             int out_bps    = av_get_bytes_per_sample(out_format);
 741             int score;
 742
 743             if (av_get_packed_sample_fmt(out_format) == format ||
 744                 av_get_planar_sample_fmt(out_format) == format) {
 745                 best_idx   = j;
 746                 break;
 747             }
 748
 749             /* for s32 and float prefer double to prevent loss of information */
 750             if (bps == 4 && out_bps == 8) {
 751                 best_idx = j;
 752                 break;
 753             }
 754
 755             /* prefer closest higher or equal bps */
 756             score = -abs(out_bps - bps);
 757             if (out_bps >= bps)
 758                 score += INT_MAX/2;
 759
 760             if (score > best_score) {
 761                 best_score = score;
 762                 best_idx   = j;
 763             }
 764         }
 765         av_assert0(best_idx >= 0);
 766         FFSWAP(int, outlink->in_formats->formats[0],
 767                outlink->in_formats->formats[best_idx]);
 768     }
 769 }
 770
 771 static void swap_sample_fmts(AVFilterGraph *graph)
 772 {
 773     int i;
 774
 775     for (i = 0; i < graph->filter_count; i++)
 776         swap_sample_fmts_on_filter(graph->filters[i]);
 777
 778 }
 779
 780 static int pick_formats(AVFilterGraph *graph)
 781 {
 782     int i, j, ret;
 783     int change;
 784
 785     do{
 786         change = 0;
 787         for (i = 0; i < graph->filter_count; i++) {
 788             AVFilterContext *filter = graph->filters[i];
 789             if (filter->nb_inputs){
 790                 for (j = 0; j < filter->nb_inputs; j++){
 791                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 792                         pick_format(filter->inputs[j], NULL);
 793                         change = 1;
 794                     }
 795                 }
 796             }
 797             if (filter->nb_outputs){
 798                 for (j = 0; j < filter->nb_outputs; j++){
 799                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 800                         pick_format(filter->outputs[j], NULL);
 801                         change = 1;
 802                     }
 803                 }
 804             }
 805             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 806                 for (j = 0; j < filter->nb_outputs; j++) {
 807                     if(filter->outputs[j]->format<0) {
 808                         pick_format(filter->outputs[j], filter->inputs[0]);
 809                         change = 1;
 810                     }
 811                 }
 812             }
 813         }
 814     }while(change);
 815
 816     for (i = 0; i < graph->filter_count; i++) {
 817         AVFilterContext *filter = graph->filters[i];
 818
 819         for (j = 0; j < filter->nb_inputs; j++)
 820             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 821                 return ret;
 822         for (j = 0; j < filter->nb_outputs; j++)
 823             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 824                 return ret;
 825     }
 826     return 0;
 827 }
 828
 829 /**
 830  * Configure the formats of all the links in the graph.
 831  */
 832 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 833 {
 834     int ret;
 835
 836     /* find supported formats from sub-filters, and merge along links */
 837     if ((ret = query_formats(graph, log_ctx)) < 0)
 838         return ret;
 839
 840     /* Once everything is merged, it's possible that we'll still have
 841      * multiple valid media format choices. We try to minimize the amount
 842      * of format conversion inside filters */
 843     reduce_formats(graph);
 844
 845     /* for audio filters, ensure the best format, sample rate and channel layout
 846      * is selected */
 847     swap_sample_fmts(graph);
 848     swap_samplerates(graph);
 849     swap_channel_layouts(graph);
 850
 851     if ((ret = pick_formats(graph)) < 0)
 852         return ret;
 853
 854     return 0;
 855 }
 856
 857 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 858                                              AVClass *log_ctx)
 859 {
 860     unsigned i, j;
 861     int sink_links_count = 0, n = 0;
 862     AVFilterContext *f;
 863     AVFilterLink **sinks;
 864
 865     for (i = 0; i < graph->filter_count; i++) {
 866         f = graph->filters[i];
 867         for (j = 0; j < f->nb_inputs; j++) {
 868             f->inputs[j]->graph     = graph;
 869             f->inputs[j]->age_index = -1;
 870         }
 871         for (j = 0; j < f->nb_outputs; j++) {
 872             f->outputs[j]->graph    = graph;
 873             f->outputs[j]->age_index= -1;
 874         }
 875         if (!f->nb_outputs) {
 876             if (f->nb_inputs > INT_MAX - sink_links_count)
 877                 return AVERROR(EINVAL);
 878             sink_links_count += f->nb_inputs;
 879         }
 880     }
 881     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 882     if (!sinks)
 883         return AVERROR(ENOMEM);
 884     for (i = 0; i < graph->filter_count; i++) {
 885         f = graph->filters[i];
 886         if (!f->nb_outputs) {
 887             for (j = 0; j < f->nb_inputs; j++) {
 888                 sinks[n] = f->inputs[j];
 889                 f->inputs[j]->age_index = n++;
 890             }
 891         }
 892     }
 893     av_assert0(n == sink_links_count);
 894     graph->sink_links       = sinks;
 895     graph->sink_links_count = sink_links_count;
 896     return 0;
 897 }
 898
 899 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 900 {
 901     AVFilterContext *f;
 902     int i, j, ret;
 903     int fifo_count = 0;
 904
 905     for (i = 0; i < graph->filter_count; i++) {
 906         f = graph->filters[i];
 907
 908         for (j = 0; j < f->nb_inputs; j++) {
 909             AVFilterLink *link = f->inputs[j];
 910             AVFilterContext *fifo_ctx;
 911             AVFilter *fifo;
 912             char name[32];
 913
 914             if (!link->dstpad->needs_fifo)
 915                 continue;
 916
 917             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
 918                    avfilter_get_by_name("fifo") :
 919                    avfilter_get_by_name("afifo");
 920
 921             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
 922
 923             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
 924                                                NULL, graph);
 925             if (ret < 0)
 926                 return ret;
 927
 928             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
 929             if (ret < 0)
 930                 return ret;
 931         }
 932     }
 933
 934     return 0;
 935 }
 936
 937 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 938 {
 939     int ret;
 940
 941     if ((ret = graph_check_validity(graphctx, log_ctx)))
 942         return ret;
 943     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
 944         return ret;
 945     if ((ret = graph_config_formats(graphctx, log_ctx)))
 946         return ret;
 947     if ((ret = graph_config_links(graphctx, log_ctx)))
 948         return ret;
 949     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 950         return ret;
 951
 952     return 0;
 953 }
 954
 955 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 956 {
 957     int i, r = AVERROR(ENOSYS);
 958
 959     if(!graph)
 960         return r;
 961
 962     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 963         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 964         if(r != AVERROR(ENOSYS))
 965             return r;
 966     }
 967
 968     if(res_len && res)
 969         res[0]= 0;
 970
 971     for (i = 0; i < graph->filter_count; i++) {
 972         AVFilterContext *filter = graph->filters[i];
 973         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 974             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 975             if(r != AVERROR(ENOSYS)) {
 976                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 977                     return r;
 978             }
 979         }
 980     }
 981
 982     return r;
 983 }
 984
 985 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 986 {
 987     int i;
 988
 989     if(!graph)
 990         return 0;
 991
 992     for (i = 0; i < graph->filter_count; i++) {
 993         AVFilterContext *filter = graph->filters[i];
 994         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 995             AVFilterCommand **que = &filter->command_queue, *next;
 996             while(*que && (*que)->time <= ts)
 997                 que = &(*que)->next;
 998             next= *que;
 999             *que= av_mallocz(sizeof(AVFilterCommand));
1000             (*que)->command = av_strdup(command);
1001             (*que)->arg     = av_strdup(arg);
1002             (*que)->time    = ts;
1003             (*que)->flags   = flags;
1004             (*que)->next    = next;
1005             if(flags & AVFILTER_CMD_FLAG_ONE)
1006                 return 0;
1007         }
1008     }
1009
1010     return 0;
1011 }
1012
1013 static void heap_bubble_up(AVFilterGraph *graph,
1014                            AVFilterLink *link, int index)
1015 {
1016     AVFilterLink **links = graph->sink_links;
1017
1018     while (index) {
1019         int parent = (index - 1) >> 1;
1020         if (links[parent]->current_pts >= link->current_pts)
1021             break;
1022         links[index] = links[parent];
1023         links[index]->age_index = index;
1024         index = parent;
1025     }
1026     links[index] = link;
1027     link->age_index = index;
1028 }
1029
1030 static void heap_bubble_down(AVFilterGraph *graph,
1031                              AVFilterLink *link, int index)
1032 {
1033     AVFilterLink **links = graph->sink_links;
1034
1035     while (1) {
1036         int child = 2 * index + 1;
1037         if (child >= graph->sink_links_count)
1038             break;
1039         if (child + 1 < graph->sink_links_count &&
1040             links[child + 1]->current_pts < links[child]->current_pts)
1041             child++;
1042         if (link->current_pts < links[child]->current_pts)
1043             break;
1044         links[index] = links[child];
1045         links[index]->age_index = index;
1046         index = child;
1047     }
1048     links[index] = link;
1049     link->age_index = index;
1050 }
1051
1052 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1053 {
1054     heap_bubble_up  (graph, link, link->age_index);
1055     heap_bubble_down(graph, link, link->age_index);
1056 }
1057
1058
1059 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1060 {
1061     while (graph->sink_links_count) {
1062         AVFilterLink *oldest = graph->sink_links[0];
1063         int r = ff_request_frame(oldest);
1064         if (r != AVERROR_EOF)
1065             return r;
1066         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1067                oldest->dst ? oldest->dst->name : "unknown",
1068                oldest->dstpad ? oldest->dstpad->name : "unknown");
1069         /* EOF: remove the link from the heap */
1070         if (oldest->age_index < --graph->sink_links_count)
1071             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1072                              oldest->age_index);
1073         oldest->age_index = -1;
1074     }
1075     return AVERROR_EOF;
1076 }