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 <string.h>
  24
  25 #include "libavutil/avassert.h"
  26 #include "libavutil/channel_layout.h"
  27 #include "libavutil/opt.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
  30 #include "avfilter.h"
  31 #include "avfiltergraph.h"
  32 #include "formats.h"
  33 #include "internal.h"
  34
  35 #define OFFSET(x) offsetof(AVFilterGraph,x)
  36
  37 static const AVOption options[]={
  38 {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
  39 {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, 0 },
  40 {0}
  41 };
  42
  43
  44 static const AVClass filtergraph_class = {
  45     .class_name = "AVFilterGraph",
  46     .item_name  = av_default_item_name,
  47     .option     = options,
  48     .version    = LIBAVUTIL_VERSION_INT,
  49     .category   = AV_CLASS_CATEGORY_FILTER,
  50 };
  51
  52 AVFilterGraph *avfilter_graph_alloc(void)
  53 {
  54     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
  55     if (!ret)
  56         return NULL;
  57     ret->av_class = &filtergraph_class;
  58     return ret;
  59 }
  60
  61 void avfilter_graph_free(AVFilterGraph **graph)
  62 {
  63     if (!*graph)
  64         return;
  65     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  66         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  67     av_freep(&(*graph)->sink_links);
  68     av_freep(&(*graph)->scale_sws_opts);
  69     av_freep(&(*graph)->aresample_swr_opts);
  70     av_freep(&(*graph)->resample_lavr_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 void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
 189 {
 190     if (!l)
 191         return;
 192     if (l->nb_channel_layouts) {
 193         if (l->all_layouts || l->all_counts)
 194             av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
 195         l->all_layouts = l->all_counts = 0;
 196     } else {
 197         if (l->all_counts && !l->all_layouts)
 198             av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
 199         l->all_layouts = 1;
 200     }
 201 }
 202
 203 static int filter_query_formats(AVFilterContext *ctx)
 204 {
 205     int ret, i;
 206     AVFilterFormats *formats;
 207     AVFilterChannelLayouts *chlayouts;
 208     AVFilterFormats *samplerates;
 209     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 210                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 211                             AVMEDIA_TYPE_VIDEO;
 212
 213     if ((ret = ctx->filter->query_formats(ctx)) < 0) {
 214         av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
 215                ctx->name, av_err2str(ret));
 216         return ret;
 217     }
 218
 219     for (i = 0; i < ctx->nb_inputs; i++)
 220         sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
 221     for (i = 0; i < ctx->nb_outputs; i++)
 222         sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
 223
 224     formats = ff_all_formats(type);
 225     if (!formats)
 226         return AVERROR(ENOMEM);
 227     ff_set_common_formats(ctx, formats);
 228     if (type == AVMEDIA_TYPE_AUDIO) {
 229         samplerates = ff_all_samplerates();
 230         if (!samplerates)
 231             return AVERROR(ENOMEM);
 232         ff_set_common_samplerates(ctx, samplerates);
 233         chlayouts = ff_all_channel_layouts();
 234         if (!chlayouts)
 235             return AVERROR(ENOMEM);
 236         ff_set_common_channel_layouts(ctx, chlayouts);
 237     }
 238     return 0;
 239 }
 240
 241 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 242 {
 243     int i, j, ret;
 244     int scaler_count = 0, resampler_count = 0;
 245
 246     for (j = 0; j < 2; j++) {
 247     /* ask all the sub-filters for their supported media formats */
 248     for (i = 0; i < graph->filter_count; i++) {
 249         /* Call query_formats on sources first.
 250            This is a temporary workaround for amerge,
 251            until format renegociation is implemented. */
 252         if (!graph->filters[i]->nb_inputs == j)
 253             continue;
 254         if (graph->filters[i]->filter->query_formats)
 255             ret = filter_query_formats(graph->filters[i]);
 256         else
 257             ret = ff_default_query_formats(graph->filters[i]);
 258         if (ret < 0)
 259             return ret;
 260     }
 261     }
 262
 263     /* go through and merge as many format lists as possible */
 264     for (i = 0; i < graph->filter_count; i++) {
 265         AVFilterContext *filter = graph->filters[i];
 266
 267         for (j = 0; j < filter->nb_inputs; j++) {
 268             AVFilterLink *link = filter->inputs[j];
 269             int convert_needed = 0;
 270
 271             if (!link)
 272                 continue;
 273
 274             if (link->in_formats != link->out_formats &&
 275                 !ff_merge_formats(link->in_formats, link->out_formats,
 276                                   link->type))
 277                 convert_needed = 1;
 278             if (link->type == AVMEDIA_TYPE_AUDIO) {
 279                 if (link->in_channel_layouts != link->out_channel_layouts &&
 280                     !ff_merge_channel_layouts(link->in_channel_layouts,
 281                                               link->out_channel_layouts))
 282                     convert_needed = 1;
 283                 if (link->in_samplerates != link->out_samplerates &&
 284                     !ff_merge_samplerates(link->in_samplerates,
 285                                           link->out_samplerates))
 286                     convert_needed = 1;
 287             }
 288
 289             if (convert_needed) {
 290                 AVFilterContext *convert;
 291                 AVFilter *filter;
 292                 AVFilterLink *inlink, *outlink;
 293                 char scale_args[256];
 294                 char inst_name[30];
 295
 296                 /* couldn't merge format lists. auto-insert conversion filter */
 297                 switch (link->type) {
 298                 case AVMEDIA_TYPE_VIDEO:
 299                     if (!(filter = avfilter_get_by_name("scale"))) {
 300                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 301                                "not present, cannot convert pixel formats.\n");
 302                         return AVERROR(EINVAL);
 303                     }
 304
 305                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 306                              scaler_count++);
 307                     if (graph->scale_sws_opts)
 308                         snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 309                     else
 310                         snprintf(scale_args, sizeof(scale_args), "0:0");
 311
 312                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 313                                                             inst_name, scale_args, NULL,
 314                                                             graph)) < 0)
 315                         return ret;
 316                     break;
 317                 case AVMEDIA_TYPE_AUDIO:
 318                     if (!(filter = avfilter_get_by_name("aresample"))) {
 319                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 320                                "not present, cannot convert audio formats.\n");
 321                         return AVERROR(EINVAL);
 322                     }
 323
 324                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 325                              resampler_count++);
 326                     scale_args[0] = '\0';
 327                     if (graph->aresample_swr_opts)
 328                         snprintf(scale_args, sizeof(scale_args), "%s",
 329                                  graph->aresample_swr_opts);
 330                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 331                                                             inst_name, graph->aresample_swr_opts,
 332                                                             NULL, graph)) < 0)
 333                         return ret;
 334                     break;
 335                 default:
 336                     return AVERROR(EINVAL);
 337                 }
 338
 339                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 340                     return ret;
 341
 342                 filter_query_formats(convert);
 343                 inlink  = convert->inputs[0];
 344                 outlink = convert->outputs[0];
 345                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
 346                     !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
 347                     ret |= AVERROR(ENOSYS);
 348                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 349                     (!ff_merge_samplerates(inlink->in_samplerates,
 350                                            inlink->out_samplerates) ||
 351                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 352                                                inlink->out_channel_layouts)))
 353                     ret |= AVERROR(ENOSYS);
 354                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 355                     (!ff_merge_samplerates(outlink->in_samplerates,
 356                                            outlink->out_samplerates) ||
 357                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 358                                                outlink->out_channel_layouts)))
 359                     ret |= AVERROR(ENOSYS);
 360
 361                 if (ret < 0) {
 362                     av_log(log_ctx, AV_LOG_ERROR,
 363                            "Impossible to convert between the formats supported by the filter "
 364                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 365                     return ret;
 366                 }
 367             }
 368         }
 369     }
 370
 371     return 0;
 372 }
 373
 374 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 375 {
 376     if (!link || !link->in_formats)
 377         return 0;
 378
 379     if (link->type == AVMEDIA_TYPE_VIDEO) {
 380         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 381             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 382             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 383             int i;
 384             for (i=0; i<link->in_formats->format_count; i++) {
 385                 enum AVPixelFormat p = link->in_formats->formats[i];
 386                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 387             }
 388             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 389                    av_get_pix_fmt_name(best), link->in_formats->format_count,
 390                    av_get_pix_fmt_name(ref->format), has_alpha);
 391             link->in_formats->formats[0] = best;
 392         }
 393     }
 394
 395     link->in_formats->format_count = 1;
 396     link->format = link->in_formats->formats[0];
 397
 398     if (link->type == AVMEDIA_TYPE_AUDIO) {
 399         if (!link->in_samplerates->format_count) {
 400             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 401                    " the link between filters %s and %s.\n", link->src->name,
 402                    link->dst->name);
 403             return AVERROR(EINVAL);
 404         }
 405         link->in_samplerates->format_count = 1;
 406         link->sample_rate = link->in_samplerates->formats[0];
 407
 408         if (link->in_channel_layouts->all_layouts) {
 409             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 410                    " the link between filters %s and %s.\n", link->src->name,
 411                    link->dst->name);
 412             return AVERROR(EINVAL);
 413         }
 414         link->in_channel_layouts->nb_channel_layouts = 1;
 415         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 416         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 417             link->channel_layout = 0;
 418         else
 419             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 420     }
 421
 422     ff_formats_unref(&link->in_formats);
 423     ff_formats_unref(&link->out_formats);
 424     ff_formats_unref(&link->in_samplerates);
 425     ff_formats_unref(&link->out_samplerates);
 426     ff_channel_layouts_unref(&link->in_channel_layouts);
 427     ff_channel_layouts_unref(&link->out_channel_layouts);
 428
 429     return 0;
 430 }
 431
 432 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 433 do {                                                                   \
 434     for (i = 0; i < filter->nb_inputs; i++) {                          \
 435         AVFilterLink *link = filter->inputs[i];                        \
 436         fmt_type fmt;                                                  \
 437                                                                        \
 438         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 439             continue;                                                  \
 440         fmt = link->out_ ## list->var[0];                              \
 441                                                                        \
 442         for (j = 0; j < filter->nb_outputs; j++) {                     \
 443             AVFilterLink *out_link = filter->outputs[j];               \
 444             list_type *fmts;                                           \
 445                                                                        \
 446             if (link->type != out_link->type ||                        \
 447                 out_link->in_ ## list->nb == 1)                        \
 448                 continue;                                              \
 449             fmts = out_link->in_ ## list;                              \
 450                                                                        \
 451             if (!out_link->in_ ## list->nb) {                          \
 452                 add_format(&out_link->in_ ##list, fmt);                \
 453                 break;                                                 \
 454             }                                                          \
 455                                                                        \
 456             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 457                 if (fmts->var[k] == fmt) {                             \
 458                     fmts->var[0]  = fmt;                               \
 459                     fmts->nb = 1;                                      \
 460                     ret = 1;                                           \
 461                     break;                                             \
 462                 }                                                      \
 463         }                                                              \
 464     }                                                                  \
 465 } while (0)
 466
 467 static int reduce_formats_on_filter(AVFilterContext *filter)
 468 {
 469     int i, j, k, ret = 0;
 470
 471     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 472                    format_count, ff_add_format);
 473     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 474                    format_count, ff_add_format);
 475
 476     /* reduce channel layouts */
 477     for (i = 0; i < filter->nb_inputs; i++) {
 478         AVFilterLink *inlink = filter->inputs[i];
 479         uint64_t fmt;
 480
 481         if (!inlink->out_channel_layouts ||
 482             inlink->out_channel_layouts->nb_channel_layouts != 1)
 483             continue;
 484         fmt = inlink->out_channel_layouts->channel_layouts[0];
 485
 486         for (j = 0; j < filter->nb_outputs; j++) {
 487             AVFilterLink *outlink = filter->outputs[j];
 488             AVFilterChannelLayouts *fmts;
 489
 490             fmts = outlink->in_channel_layouts;
 491             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 492                 continue;
 493
 494             if (fmts->all_layouts) {
 495                 /* Turn the infinite list into a singleton */
 496                 fmts->all_layouts = fmts->all_counts  = 0;
 497                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 498                 break;
 499             }
 500
 501             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 502                 if (fmts->channel_layouts[k] == fmt) {
 503                     fmts->channel_layouts[0]  = fmt;
 504                     fmts->nb_channel_layouts = 1;
 505                     ret = 1;
 506                     break;
 507                 }
 508             }
 509         }
 510     }
 511
 512     return ret;
 513 }
 514
 515 static void reduce_formats(AVFilterGraph *graph)
 516 {
 517     int i, reduced;
 518
 519     do {
 520         reduced = 0;
 521
 522         for (i = 0; i < graph->filter_count; i++)
 523             reduced |= reduce_formats_on_filter(graph->filters[i]);
 524     } while (reduced);
 525 }
 526
 527 static void swap_samplerates_on_filter(AVFilterContext *filter)
 528 {
 529     AVFilterLink *link = NULL;
 530     int sample_rate;
 531     int i, j;
 532
 533     for (i = 0; i < filter->nb_inputs; i++) {
 534         link = filter->inputs[i];
 535
 536         if (link->type == AVMEDIA_TYPE_AUDIO &&
 537             link->out_samplerates->format_count == 1)
 538             break;
 539     }
 540     if (i == filter->nb_inputs)
 541         return;
 542
 543     sample_rate = link->out_samplerates->formats[0];
 544
 545     for (i = 0; i < filter->nb_outputs; i++) {
 546         AVFilterLink *outlink = filter->outputs[i];
 547         int best_idx, best_diff = INT_MAX;
 548
 549         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 550             outlink->in_samplerates->format_count < 2)
 551             continue;
 552
 553         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 554             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 555
 556             if (diff < best_diff) {
 557                 best_diff = diff;
 558                 best_idx  = j;
 559             }
 560         }
 561         FFSWAP(int, outlink->in_samplerates->formats[0],
 562                outlink->in_samplerates->formats[best_idx]);
 563     }
 564 }
 565
 566 static void swap_samplerates(AVFilterGraph *graph)
 567 {
 568     int i;
 569
 570     for (i = 0; i < graph->filter_count; i++)
 571         swap_samplerates_on_filter(graph->filters[i]);
 572 }
 573
 574 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 575 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 576 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 577 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 578 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 579 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 580 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 581
 582 /* allowable substitutions for channel pairs when comparing layouts,
 583  * ordered by priority for both values */
 584 static const uint64_t ch_subst[][2] = {
 585     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 586     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 587     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 588     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 589     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 590     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 591     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 592     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 593     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 594     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 595     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 596     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 597     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 598     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 599     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 600     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 601     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 602     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 603     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 604     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 605     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 606 };
 607
 608 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 609 {
 610     AVFilterLink *link = NULL;
 611     int i, j, k;
 612
 613     for (i = 0; i < filter->nb_inputs; i++) {
 614         link = filter->inputs[i];
 615
 616         if (link->type == AVMEDIA_TYPE_AUDIO &&
 617             link->out_channel_layouts->nb_channel_layouts == 1)
 618             break;
 619     }
 620     if (i == filter->nb_inputs)
 621         return;
 622
 623     for (i = 0; i < filter->nb_outputs; i++) {
 624         AVFilterLink *outlink = filter->outputs[i];
 625         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 626
 627         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 628             outlink->in_channel_layouts->nb_channel_layouts < 2)
 629             continue;
 630
 631         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 632             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 633             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 634             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 635             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 636             int count_diff        = out_channels - in_channels;
 637             int matched_channels, extra_channels;
 638             int score = 100000;
 639
 640             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 641                 /* Compute score in case the input or output layout encodes
 642                    a channel count; in this case the score is not altered by
 643                    the computation afterwards, as in_chlayout and
 644                    out_chlayout have both been set to 0 */
 645                 if (FF_LAYOUT2COUNT(in_chlayout))
 646                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 647                 if (FF_LAYOUT2COUNT(out_chlayout))
 648                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 649                 score -= 10000 + FFABS(out_channels - in_channels) +
 650                          (in_channels > out_channels ? 10000 : 0);
 651                 in_chlayout = out_chlayout = 0;
 652                 /* Let the remaining computation run, even if the score
 653                    value is not altered */
 654             }
 655
 656             /* channel substitution */
 657             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 658                 uint64_t cmp0 = ch_subst[k][0];
 659                 uint64_t cmp1 = ch_subst[k][1];
 660                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 661                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 662                     in_chlayout  &= ~cmp0;
 663                     out_chlayout &= ~cmp1;
 664                     /* add score for channel match, minus a deduction for
 665                        having to do the substitution */
 666                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 667                 }
 668             }
 669
 670             /* no penalty for LFE channel mismatch */
 671             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 672                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 673                 score += 10;
 674             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 675             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 676
 677             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 678                                                                  out_chlayout);
 679             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 680                                                                  (~in_chlayout));
 681             score += 10 * matched_channels - 5 * extra_channels;
 682
 683             if (score > best_score ||
 684                 (count_diff < best_count_diff && score == best_score)) {
 685                 best_score = score;
 686                 best_idx   = j;
 687                 best_count_diff = count_diff;
 688             }
 689         }
 690         av_assert0(best_idx >= 0);
 691         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 692                outlink->in_channel_layouts->channel_layouts[best_idx]);
 693     }
 694
 695 }
 696
 697 static void swap_channel_layouts(AVFilterGraph *graph)
 698 {
 699     int i;
 700
 701     for (i = 0; i < graph->filter_count; i++)
 702         swap_channel_layouts_on_filter(graph->filters[i]);
 703 }
 704
 705 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 706 {
 707     AVFilterLink *link = NULL;
 708     int format, bps;
 709     int i, j;
 710
 711     for (i = 0; i < filter->nb_inputs; i++) {
 712         link = filter->inputs[i];
 713
 714         if (link->type == AVMEDIA_TYPE_AUDIO &&
 715             link->out_formats->format_count == 1)
 716             break;
 717     }
 718     if (i == filter->nb_inputs)
 719         return;
 720
 721     format = link->out_formats->formats[0];
 722     bps    = av_get_bytes_per_sample(format);
 723
 724     for (i = 0; i < filter->nb_outputs; i++) {
 725         AVFilterLink *outlink = filter->outputs[i];
 726         int best_idx = -1, best_score = INT_MIN;
 727
 728         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 729             outlink->in_formats->format_count < 2)
 730             continue;
 731
 732         for (j = 0; j < outlink->in_formats->format_count; j++) {
 733             int out_format = outlink->in_formats->formats[j];
 734             int out_bps    = av_get_bytes_per_sample(out_format);
 735             int score;
 736
 737             if (av_get_packed_sample_fmt(out_format) == format ||
 738                 av_get_planar_sample_fmt(out_format) == format) {
 739                 best_idx   = j;
 740                 break;
 741             }
 742
 743             /* for s32 and float prefer double to prevent loss of information */
 744             if (bps == 4 && out_bps == 8) {
 745                 best_idx = j;
 746                 break;
 747             }
 748
 749             /* prefer closest higher or equal bps */
 750             score = -abs(out_bps - bps);
 751             if (out_bps >= bps)
 752                 score += INT_MAX/2;
 753
 754             if (score > best_score) {
 755                 best_score = score;
 756                 best_idx   = j;
 757             }
 758         }
 759         av_assert0(best_idx >= 0);
 760         FFSWAP(int, outlink->in_formats->formats[0],
 761                outlink->in_formats->formats[best_idx]);
 762     }
 763 }
 764
 765 static void swap_sample_fmts(AVFilterGraph *graph)
 766 {
 767     int i;
 768
 769     for (i = 0; i < graph->filter_count; i++)
 770         swap_sample_fmts_on_filter(graph->filters[i]);
 771
 772 }
 773
 774 static int pick_formats(AVFilterGraph *graph)
 775 {
 776     int i, j, ret;
 777     int change;
 778
 779     do{
 780         change = 0;
 781         for (i = 0; i < graph->filter_count; i++) {
 782             AVFilterContext *filter = graph->filters[i];
 783             if (filter->nb_inputs){
 784                 for (j = 0; j < filter->nb_inputs; j++){
 785                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 786                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 787                             return ret;
 788                         change = 1;
 789                     }
 790                 }
 791             }
 792             if (filter->nb_outputs){
 793                 for (j = 0; j < filter->nb_outputs; j++){
 794                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 795                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 796                             return ret;
 797                         change = 1;
 798                     }
 799                 }
 800             }
 801             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 802                 for (j = 0; j < filter->nb_outputs; j++) {
 803                     if(filter->outputs[j]->format<0) {
 804                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
 805                             return ret;
 806                         change = 1;
 807                     }
 808                 }
 809             }
 810         }
 811     }while(change);
 812
 813     for (i = 0; i < graph->filter_count; i++) {
 814         AVFilterContext *filter = graph->filters[i];
 815
 816         for (j = 0; j < filter->nb_inputs; j++)
 817             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 818                 return ret;
 819         for (j = 0; j < filter->nb_outputs; j++)
 820             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 821                 return ret;
 822     }
 823     return 0;
 824 }
 825
 826 /**
 827  * Configure the formats of all the links in the graph.
 828  */
 829 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 830 {
 831     int ret;
 832
 833     /* find supported formats from sub-filters, and merge along links */
 834     if ((ret = query_formats(graph, log_ctx)) < 0)
 835         return ret;
 836
 837     /* Once everything is merged, it's possible that we'll still have
 838      * multiple valid media format choices. We try to minimize the amount
 839      * of format conversion inside filters */
 840     reduce_formats(graph);
 841
 842     /* for audio filters, ensure the best format, sample rate and channel layout
 843      * is selected */
 844     swap_sample_fmts(graph);
 845     swap_samplerates(graph);
 846     swap_channel_layouts(graph);
 847
 848     if ((ret = pick_formats(graph)) < 0)
 849         return ret;
 850
 851     return 0;
 852 }
 853
 854 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 855                                              AVClass *log_ctx)
 856 {
 857     unsigned i, j;
 858     int sink_links_count = 0, n = 0;
 859     AVFilterContext *f;
 860     AVFilterLink **sinks;
 861
 862     for (i = 0; i < graph->filter_count; i++) {
 863         f = graph->filters[i];
 864         for (j = 0; j < f->nb_inputs; j++) {
 865             f->inputs[j]->graph     = graph;
 866             f->inputs[j]->age_index = -1;
 867         }
 868         for (j = 0; j < f->nb_outputs; j++) {
 869             f->outputs[j]->graph    = graph;
 870             f->outputs[j]->age_index= -1;
 871         }
 872         if (!f->nb_outputs) {
 873             if (f->nb_inputs > INT_MAX - sink_links_count)
 874                 return AVERROR(EINVAL);
 875             sink_links_count += f->nb_inputs;
 876         }
 877     }
 878     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 879     if (!sinks)
 880         return AVERROR(ENOMEM);
 881     for (i = 0; i < graph->filter_count; i++) {
 882         f = graph->filters[i];
 883         if (!f->nb_outputs) {
 884             for (j = 0; j < f->nb_inputs; j++) {
 885                 sinks[n] = f->inputs[j];
 886                 f->inputs[j]->age_index = n++;
 887             }
 888         }
 889     }
 890     av_assert0(n == sink_links_count);
 891     graph->sink_links       = sinks;
 892     graph->sink_links_count = sink_links_count;
 893     return 0;
 894 }
 895
 896 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 897 {
 898     AVFilterContext *f;
 899     int i, j, ret;
 900     int fifo_count = 0;
 901
 902     for (i = 0; i < graph->filter_count; i++) {
 903         f = graph->filters[i];
 904
 905         for (j = 0; j < f->nb_inputs; j++) {
 906             AVFilterLink *link = f->inputs[j];
 907             AVFilterContext *fifo_ctx;
 908             AVFilter *fifo;
 909             char name[32];
 910
 911             if (!link->dstpad->needs_fifo)
 912                 continue;
 913
 914             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
 915                    avfilter_get_by_name("fifo") :
 916                    avfilter_get_by_name("afifo");
 917
 918             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
 919
 920             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
 921                                                NULL, graph);
 922             if (ret < 0)
 923                 return ret;
 924
 925             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
 926             if (ret < 0)
 927                 return ret;
 928         }
 929     }
 930
 931     return 0;
 932 }
 933
 934 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 935 {
 936     int ret;
 937
 938     if ((ret = graph_check_validity(graphctx, log_ctx)))
 939         return ret;
 940     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
 941         return ret;
 942     if ((ret = graph_config_formats(graphctx, log_ctx)))
 943         return ret;
 944     if ((ret = graph_config_links(graphctx, log_ctx)))
 945         return ret;
 946     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
 947         return ret;
 948
 949     return 0;
 950 }
 951
 952 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 953 {
 954     int i, r = AVERROR(ENOSYS);
 955
 956     if(!graph)
 957         return r;
 958
 959     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 960         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 961         if(r != AVERROR(ENOSYS))
 962             return r;
 963     }
 964
 965     if(res_len && res)
 966         res[0]= 0;
 967
 968     for (i = 0; i < graph->filter_count; i++) {
 969         AVFilterContext *filter = graph->filters[i];
 970         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 971             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 972             if(r != AVERROR(ENOSYS)) {
 973                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 974                     return r;
 975             }
 976         }
 977     }
 978
 979     return r;
 980 }
 981
 982 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 983 {
 984     int i;
 985
 986     if(!graph)
 987         return 0;
 988
 989     for (i = 0; i < graph->filter_count; i++) {
 990         AVFilterContext *filter = graph->filters[i];
 991         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 992             AVFilterCommand **queue = &filter->command_queue, *next;
 993             while (*queue && (*queue)->time <= ts)
 994                 queue = &(*queue)->next;
 995             next = *queue;
 996             *queue = av_mallocz(sizeof(AVFilterCommand));
 997             (*queue)->command = av_strdup(command);
 998             (*queue)->arg     = av_strdup(arg);
 999             (*queue)->time    = ts;
1000             (*queue)->flags   = flags;
1001             (*queue)->next    = next;
1002             if(flags & AVFILTER_CMD_FLAG_ONE)
1003                 return 0;
1004         }
1005     }
1006
1007     return 0;
1008 }
1009
1010 static void heap_bubble_up(AVFilterGraph *graph,
1011                            AVFilterLink *link, int index)
1012 {
1013     AVFilterLink **links = graph->sink_links;
1014
1015     while (index) {
1016         int parent = (index - 1) >> 1;
1017         if (links[parent]->current_pts >= link->current_pts)
1018             break;
1019         links[index] = links[parent];
1020         links[index]->age_index = index;
1021         index = parent;
1022     }
1023     links[index] = link;
1024     link->age_index = index;
1025 }
1026
1027 static void heap_bubble_down(AVFilterGraph *graph,
1028                              AVFilterLink *link, int index)
1029 {
1030     AVFilterLink **links = graph->sink_links;
1031
1032     while (1) {
1033         int child = 2 * index + 1;
1034         if (child >= graph->sink_links_count)
1035             break;
1036         if (child + 1 < graph->sink_links_count &&
1037             links[child + 1]->current_pts < links[child]->current_pts)
1038             child++;
1039         if (link->current_pts < links[child]->current_pts)
1040             break;
1041         links[index] = links[child];
1042         links[index]->age_index = index;
1043         index = child;
1044     }
1045     links[index] = link;
1046     link->age_index = index;
1047 }
1048
1049 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1050 {
1051     heap_bubble_up  (graph, link, link->age_index);
1052     heap_bubble_down(graph, link, link->age_index);
1053 }
1054
1055
1056 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1057 {
1058     while (graph->sink_links_count) {
1059         AVFilterLink *oldest = graph->sink_links[0];
1060         int r = ff_request_frame(oldest);
1061         if (r != AVERROR_EOF)
1062             return r;
1063         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1064                oldest->dst ? oldest->dst->name : "unknown",
1065                oldest->dstpad ? oldest->dstpad->name : "unknown");
1066         /* EOF: remove the link from the heap */
1067         if (oldest->age_index < --graph->sink_links_count)
1068             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1069                              oldest->age_index);
1070         oldest->age_index = -1;
1071     }
1072     return AVERROR_EOF;
1073 }