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 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 insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 242                               const char *filt_name, const char *filt_args)
 243 {
 244     static int auto_count = 0, ret;
 245     char inst_name[32];
 246     AVFilterContext *filt_ctx;
 247
 248     if (graph->disable_auto_convert) {
 249         av_log(NULL, AV_LOG_ERROR,
 250                "The filters '%s' and '%s' do not have a common format "
 251                "and automatic conversion is disabled.\n",
 252                link->src->name, link->dst->name);
 253         return AVERROR(EINVAL);
 254     }
 255
 256     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 257             filt_name, auto_count++);
 258
 259     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 260                                             avfilter_get_by_name(filt_name),
 261                                             inst_name, filt_args, NULL, graph)) < 0)
 262         return ret;
 263     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 264         return ret;
 265
 266     filter_query_formats(filt_ctx);
 267
 268     if ( ((link = filt_ctx-> inputs[0]) &&
 269            !ff_merge_formats(link->in_formats, link->out_formats)) ||
 270          ((link = filt_ctx->outputs[0]) &&
 271            !ff_merge_formats(link->in_formats, link->out_formats))
 272        ) {
 273         av_log(NULL, AV_LOG_ERROR,
 274                "Impossible to convert between the formats supported by the filter "
 275                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 276         return AVERROR(EINVAL);
 277     }
 278
 279     if (link->type == AVMEDIA_TYPE_AUDIO &&
 280          (((link = filt_ctx-> inputs[0]) &&
 281            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
 282          ((link = filt_ctx->outputs[0]) &&
 283            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
 284        ) {
 285         av_log(NULL, AV_LOG_ERROR,
 286                "Impossible to convert between the channel layouts formats supported by the filter "
 287                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 288         return AVERROR(EINVAL);
 289     }
 290
 291     return 0;
 292 }
 293
 294 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 295 {
 296     int i, j, ret;
 297 #if 0
 298     char filt_args[128];
 299     AVFilterFormats *formats;
 300     AVFilterChannelLayouts *chlayouts;
 301     AVFilterFormats *samplerates;
 302 #endif
 303     int scaler_count = 0, resampler_count = 0;
 304
 305     for (j = 0; j < 2; j++) {
 306     /* ask all the sub-filters for their supported media formats */
 307     for (i = 0; i < graph->filter_count; i++) {
 308         /* Call query_formats on sources first.
 309            This is a temporary workaround for amerge,
 310            until format renegociation is implemented. */
 311         if (!graph->filters[i]->nb_inputs == j)
 312             continue;
 313         if (graph->filters[i]->filter->query_formats)
 314             ret = filter_query_formats(graph->filters[i]);
 315         else
 316             ret = ff_default_query_formats(graph->filters[i]);
 317         if (ret < 0)
 318             return ret;
 319     }
 320     }
 321
 322     /* go through and merge as many format lists as possible */
 323     for (i = 0; i < graph->filter_count; i++) {
 324         AVFilterContext *filter = graph->filters[i];
 325
 326         for (j = 0; j < filter->nb_inputs; j++) {
 327             AVFilterLink *link = filter->inputs[j];
 328 #if 0
 329             if (!link) continue;
 330
 331             if (!link->in_formats || !link->out_formats)
 332                 return AVERROR(EINVAL);
 333
 334             if (link->type == AVMEDIA_TYPE_VIDEO &&
 335                 !ff_merge_formats(link->in_formats, link->out_formats)) {
 336
 337                 /* couldn't merge format lists, auto-insert scale filter */
 338                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 339                          graph->scale_sws_opts);
 340                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 341                     return ret;
 342             }
 343             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 344                 if (!link->in_channel_layouts || !link->out_channel_layouts)
 345                     return AVERROR(EINVAL);
 346
 347                 /* Merge all three list before checking: that way, in all
 348                  * three categories, aconvert will use a common format
 349                  * whenever possible. */
 350                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
 351                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
 352                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
 353
 354                 if (!formats || !chlayouts || !samplerates)
 355                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
 356                        return ret;
 357 #else
 358             int convert_needed = 0;
 359
 360             if (!link)
 361                 continue;
 362
 363             if (link->in_formats != link->out_formats &&
 364                 !ff_merge_formats(link->in_formats,
 365                                         link->out_formats))
 366                 convert_needed = 1;
 367             if (link->type == AVMEDIA_TYPE_AUDIO) {
 368                 if (link->in_channel_layouts != link->out_channel_layouts &&
 369                     !ff_merge_channel_layouts(link->in_channel_layouts,
 370                                               link->out_channel_layouts))
 371                     convert_needed = 1;
 372                 if (link->in_samplerates != link->out_samplerates &&
 373                     !ff_merge_samplerates(link->in_samplerates,
 374                                           link->out_samplerates))
 375                     convert_needed = 1;
 376             }
 377
 378             if (convert_needed) {
 379                 AVFilterContext *convert;
 380                 AVFilter *filter;
 381                 AVFilterLink *inlink, *outlink;
 382                 char scale_args[256];
 383                 char inst_name[30];
 384
 385                 /* couldn't merge format lists. auto-insert conversion filter */
 386                 switch (link->type) {
 387                 case AVMEDIA_TYPE_VIDEO:
 388                     if (!(filter = avfilter_get_by_name("scale"))) {
 389                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
 390                                "not present, cannot convert pixel formats.\n");
 391                         return AVERROR(EINVAL);
 392                     }
 393
 394                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
 395                              scaler_count++);
 396                     if (graph->scale_sws_opts)
 397                         snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
 398                     else
 399                         snprintf(scale_args, sizeof(scale_args), "0:0");
 400
 401                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 402                                                             inst_name, scale_args, NULL,
 403                                                             graph)) < 0)
 404                         return ret;
 405                     break;
 406                 case AVMEDIA_TYPE_AUDIO:
 407                     if (!(filter = avfilter_get_by_name("aresample"))) {
 408                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
 409                                "not present, cannot convert audio formats.\n");
 410                         return AVERROR(EINVAL);
 411                     }
 412
 413                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
 414                              resampler_count++);
 415                     if ((ret = avfilter_graph_create_filter(&convert, filter,
 416                                                             inst_name, graph->aresample_swr_opts, NULL, graph)) < 0)
 417                         return ret;
 418                     break;
 419                 default:
 420                     return AVERROR(EINVAL);
 421                 }
 422
 423                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
 424                     return ret;
 425
 426                 filter_query_formats(convert);
 427                 inlink  = convert->inputs[0];
 428                 outlink = convert->outputs[0];
 429                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
 430                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
 431                     ret |= AVERROR(ENOSYS);
 432                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
 433                     (!ff_merge_samplerates(inlink->in_samplerates,
 434                                            inlink->out_samplerates) ||
 435                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
 436                                                inlink->out_channel_layouts)))
 437                     ret |= AVERROR(ENOSYS);
 438                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
 439                     (!ff_merge_samplerates(outlink->in_samplerates,
 440                                            outlink->out_samplerates) ||
 441                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
 442                                                outlink->out_channel_layouts)))
 443                     ret |= AVERROR(ENOSYS);
 444
 445                 if (ret < 0) {
 446                     av_log(log_ctx, AV_LOG_ERROR,
 447                            "Impossible to convert between the formats supported by the filter "
 448                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 449                     return ret;
 450                 }
 451 #endif
 452             }
 453         }
 454     }
 455
 456     return 0;
 457 }
 458
 459 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 460 {
 461     if (!link || !link->in_formats)
 462         return 0;
 463
 464     if (link->type == AVMEDIA_TYPE_VIDEO) {
 465         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
 466             int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
 467             enum AVPixelFormat best= AV_PIX_FMT_NONE;
 468             int i;
 469             for (i=0; i<link->in_formats->format_count; i++) {
 470                 enum AVPixelFormat p = link->in_formats->formats[i];
 471                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
 472             }
 473             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
 474                    av_get_pix_fmt_name(best), link->in_formats->format_count,
 475                    av_get_pix_fmt_name(ref->format), has_alpha);
 476             link->in_formats->formats[0] = best;
 477         }
 478     }
 479
 480     link->in_formats->format_count = 1;
 481     link->format = link->in_formats->formats[0];
 482
 483     if (link->type == AVMEDIA_TYPE_AUDIO) {
 484         if (!link->in_samplerates->format_count) {
 485             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
 486                    " the link between filters %s and %s.\n", link->src->name,
 487                    link->dst->name);
 488             return AVERROR(EINVAL);
 489         }
 490         link->in_samplerates->format_count = 1;
 491         link->sample_rate = link->in_samplerates->formats[0];
 492
 493         if (link->in_channel_layouts->all_layouts) {
 494             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
 495                    "the link between filters %s and %s.\n", link->src->name,
 496                    link->dst->name);
 497             return AVERROR(EINVAL);
 498         }
 499         link->in_channel_layouts->nb_channel_layouts = 1;
 500         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
 501         if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
 502             link->channel_layout = 0;
 503         else
 504             link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
 505     }
 506
 507     ff_formats_unref(&link->in_formats);
 508     ff_formats_unref(&link->out_formats);
 509     ff_formats_unref(&link->in_samplerates);
 510     ff_formats_unref(&link->out_samplerates);
 511     ff_channel_layouts_unref(&link->in_channel_layouts);
 512     ff_channel_layouts_unref(&link->out_channel_layouts);
 513
 514     return 0;
 515 }
 516
 517 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
 518 do {                                                                   \
 519     for (i = 0; i < filter->nb_inputs; i++) {                          \
 520         AVFilterLink *link = filter->inputs[i];                        \
 521         fmt_type fmt;                                                  \
 522                                                                        \
 523         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
 524             continue;                                                  \
 525         fmt = link->out_ ## list->var[0];                              \
 526                                                                        \
 527         for (j = 0; j < filter->nb_outputs; j++) {                     \
 528             AVFilterLink *out_link = filter->outputs[j];               \
 529             list_type *fmts;                                           \
 530                                                                        \
 531             if (link->type != out_link->type ||                        \
 532                 out_link->in_ ## list->nb == 1)                        \
 533                 continue;                                              \
 534             fmts = out_link->in_ ## list;                              \
 535                                                                        \
 536             if (!out_link->in_ ## list->nb) {                          \
 537                 add_format(&out_link->in_ ##list, fmt);                \
 538                 break;                                                 \
 539             }                                                          \
 540                                                                        \
 541             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
 542                 if (fmts->var[k] == fmt) {                             \
 543                     fmts->var[0]  = fmt;                               \
 544                     fmts->nb = 1;                                      \
 545                     ret = 1;                                           \
 546                     break;                                             \
 547                 }                                                      \
 548         }                                                              \
 549     }                                                                  \
 550 } while (0)
 551
 552 static int reduce_formats_on_filter(AVFilterContext *filter)
 553 {
 554     int i, j, k, ret = 0;
 555
 556     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
 557                    format_count, ff_add_format);
 558     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
 559                    format_count, ff_add_format);
 560
 561     /* reduce channel layouts */
 562     for (i = 0; i < filter->nb_inputs; i++) {
 563         AVFilterLink *inlink = filter->inputs[i];
 564         uint64_t fmt;
 565
 566         if (!inlink->out_channel_layouts ||
 567             inlink->out_channel_layouts->nb_channel_layouts != 1)
 568             continue;
 569         fmt = inlink->out_channel_layouts->channel_layouts[0];
 570
 571         for (j = 0; j < filter->nb_outputs; j++) {
 572             AVFilterLink *outlink = filter->outputs[j];
 573             AVFilterChannelLayouts *fmts;
 574
 575             fmts = outlink->in_channel_layouts;
 576             if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
 577                 continue;
 578
 579             if (fmts->all_layouts) {
 580                 /* Turn the infinite list into a singleton */
 581                 fmts->all_layouts = fmts->all_counts  = 0;
 582                 ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
 583                 break;
 584             }
 585
 586             for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
 587                 if (fmts->channel_layouts[k] == fmt) {
 588                     fmts->channel_layouts[0]  = fmt;
 589                     fmts->nb_channel_layouts = 1;
 590                     ret = 1;
 591                     break;
 592                 }
 593             }
 594         }
 595     }
 596
 597     return ret;
 598 }
 599
 600 static void reduce_formats(AVFilterGraph *graph)
 601 {
 602     int i, reduced;
 603
 604     do {
 605         reduced = 0;
 606
 607         for (i = 0; i < graph->filter_count; i++)
 608             reduced |= reduce_formats_on_filter(graph->filters[i]);
 609     } while (reduced);
 610 }
 611
 612 static void swap_samplerates_on_filter(AVFilterContext *filter)
 613 {
 614     AVFilterLink *link = NULL;
 615     int sample_rate;
 616     int i, j;
 617
 618     for (i = 0; i < filter->nb_inputs; i++) {
 619         link = filter->inputs[i];
 620
 621         if (link->type == AVMEDIA_TYPE_AUDIO &&
 622             link->out_samplerates->format_count == 1)
 623             break;
 624     }
 625     if (i == filter->nb_inputs)
 626         return;
 627
 628     sample_rate = link->out_samplerates->formats[0];
 629
 630     for (i = 0; i < filter->nb_outputs; i++) {
 631         AVFilterLink *outlink = filter->outputs[i];
 632         int best_idx, best_diff = INT_MAX;
 633
 634         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 635             outlink->in_samplerates->format_count < 2)
 636             continue;
 637
 638         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
 639             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 640
 641             if (diff < best_diff) {
 642                 best_diff = diff;
 643                 best_idx  = j;
 644             }
 645         }
 646         FFSWAP(int, outlink->in_samplerates->formats[0],
 647                outlink->in_samplerates->formats[best_idx]);
 648     }
 649 }
 650
 651 static void swap_samplerates(AVFilterGraph *graph)
 652 {
 653     int i;
 654
 655     for (i = 0; i < graph->filter_count; i++)
 656         swap_samplerates_on_filter(graph->filters[i]);
 657 }
 658
 659 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
 660 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
 661 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
 662 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
 663 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
 664 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
 665 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
 666
 667 /* allowable substitutions for channel pairs when comparing layouts,
 668  * ordered by priority for both values */
 669 static const uint64_t ch_subst[][2] = {
 670     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
 671     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
 672     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
 673     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
 674     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
 675     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
 676     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
 677     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
 678     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
 679     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
 680     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
 681     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
 682     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
 683     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
 684     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
 685     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
 686     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
 687     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
 688     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
 689     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
 690     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
 691 };
 692
 693 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
 694 {
 695     AVFilterLink *link = NULL;
 696     int i, j, k;
 697
 698     for (i = 0; i < filter->nb_inputs; i++) {
 699         link = filter->inputs[i];
 700
 701         if (link->type == AVMEDIA_TYPE_AUDIO &&
 702             link->out_channel_layouts->nb_channel_layouts == 1)
 703             break;
 704     }
 705     if (i == filter->nb_inputs)
 706         return;
 707
 708     for (i = 0; i < filter->nb_outputs; i++) {
 709         AVFilterLink *outlink = filter->outputs[i];
 710         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
 711
 712         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 713             outlink->in_channel_layouts->nb_channel_layouts < 2)
 714             continue;
 715
 716         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
 717             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
 718             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
 719             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
 720             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
 721             int count_diff        = out_channels - in_channels;
 722             int matched_channels, extra_channels;
 723             int score = 100000;
 724
 725             if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
 726                 /* Compute score in case the input or output layout encodes
 727                    a channel count; in this case the score is not altered by
 728                    the computation afterwards, as in_chlayout and
 729                    out_chlayout have both been set to 0 */
 730                 if (FF_LAYOUT2COUNT(in_chlayout))
 731                     in_channels = FF_LAYOUT2COUNT(in_chlayout);
 732                 if (FF_LAYOUT2COUNT(out_chlayout))
 733                     out_channels = FF_LAYOUT2COUNT(out_chlayout);
 734                 score -= 10000 + FFABS(out_channels - in_channels) +
 735                          (in_channels > out_channels ? 10000 : 0);
 736                 in_chlayout = out_chlayout = 0;
 737                 /* Let the remaining computation run, even if the score
 738                    value is not altered */
 739             }
 740
 741             /* channel substitution */
 742             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
 743                 uint64_t cmp0 = ch_subst[k][0];
 744                 uint64_t cmp1 = ch_subst[k][1];
 745                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
 746                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
 747                     in_chlayout  &= ~cmp0;
 748                     out_chlayout &= ~cmp1;
 749                     /* add score for channel match, minus a deduction for
 750                        having to do the substitution */
 751                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
 752                 }
 753             }
 754
 755             /* no penalty for LFE channel mismatch */
 756             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
 757                 (out_chlayout & AV_CH_LOW_FREQUENCY))
 758                 score += 10;
 759             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
 760             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
 761
 762             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
 763                                                                  out_chlayout);
 764             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
 765                                                                  (~in_chlayout));
 766             score += 10 * matched_channels - 5 * extra_channels;
 767
 768             if (score > best_score ||
 769                 (count_diff < best_count_diff && score == best_score)) {
 770                 best_score = score;
 771                 best_idx   = j;
 772                 best_count_diff = count_diff;
 773             }
 774         }
 775         av_assert0(best_idx >= 0);
 776         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
 777                outlink->in_channel_layouts->channel_layouts[best_idx]);
 778     }
 779
 780 }
 781
 782 static void swap_channel_layouts(AVFilterGraph *graph)
 783 {
 784     int i;
 785
 786     for (i = 0; i < graph->filter_count; i++)
 787         swap_channel_layouts_on_filter(graph->filters[i]);
 788 }
 789
 790 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
 791 {
 792     AVFilterLink *link = NULL;
 793     int format, bps;
 794     int i, j;
 795
 796     for (i = 0; i < filter->nb_inputs; i++) {
 797         link = filter->inputs[i];
 798
 799         if (link->type == AVMEDIA_TYPE_AUDIO &&
 800             link->out_formats->format_count == 1)
 801             break;
 802     }
 803     if (i == filter->nb_inputs)
 804         return;
 805
 806     format = link->out_formats->formats[0];
 807     bps    = av_get_bytes_per_sample(format);
 808
 809     for (i = 0; i < filter->nb_outputs; i++) {
 810         AVFilterLink *outlink = filter->outputs[i];
 811         int best_idx = -1, best_score = INT_MIN;
 812
 813         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
 814             outlink->in_formats->format_count < 2)
 815             continue;
 816
 817         for (j = 0; j < outlink->in_formats->format_count; j++) {
 818             int out_format = outlink->in_formats->formats[j];
 819             int out_bps    = av_get_bytes_per_sample(out_format);
 820             int score;
 821
 822             if (av_get_packed_sample_fmt(out_format) == format ||
 823                 av_get_planar_sample_fmt(out_format) == format) {
 824                 best_idx   = j;
 825                 break;
 826             }
 827
 828             /* for s32 and float prefer double to prevent loss of information */
 829             if (bps == 4 && out_bps == 8) {
 830                 best_idx = j;
 831                 break;
 832             }
 833
 834             /* prefer closest higher or equal bps */
 835             score = -abs(out_bps - bps);
 836             if (out_bps >= bps)
 837                 score += INT_MAX/2;
 838
 839             if (score > best_score) {
 840                 best_score = score;
 841                 best_idx   = j;
 842             }
 843         }
 844         av_assert0(best_idx >= 0);
 845         FFSWAP(int, outlink->in_formats->formats[0],
 846                outlink->in_formats->formats[best_idx]);
 847     }
 848 }
 849
 850 static void swap_sample_fmts(AVFilterGraph *graph)
 851 {
 852     int i;
 853
 854     for (i = 0; i < graph->filter_count; i++)
 855         swap_sample_fmts_on_filter(graph->filters[i]);
 856
 857 }
 858
 859 static int pick_formats(AVFilterGraph *graph)
 860 {
 861     int i, j, ret;
 862     int change;
 863
 864     do{
 865         change = 0;
 866         for (i = 0; i < graph->filter_count; i++) {
 867             AVFilterContext *filter = graph->filters[i];
 868             if (filter->nb_inputs){
 869                 for (j = 0; j < filter->nb_inputs; j++){
 870                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
 871                         if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 872                             return ret;
 873                         change = 1;
 874                     }
 875                 }
 876             }
 877             if (filter->nb_outputs){
 878                 for (j = 0; j < filter->nb_outputs; j++){
 879                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
 880                         if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 881                             return ret;
 882                         change = 1;
 883                     }
 884                 }
 885             }
 886             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
 887                 for (j = 0; j < filter->nb_outputs; j++) {
 888                     if(filter->outputs[j]->format<0) {
 889                         if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
 890                             return ret;
 891                         change = 1;
 892                     }
 893                 }
 894             }
 895         }
 896     }while(change);
 897
 898     for (i = 0; i < graph->filter_count; i++) {
 899         AVFilterContext *filter = graph->filters[i];
 900
 901         for (j = 0; j < filter->nb_inputs; j++)
 902             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
 903                 return ret;
 904         for (j = 0; j < filter->nb_outputs; j++)
 905             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
 906                 return ret;
 907     }
 908     return 0;
 909 }
 910
 911 /**
 912  * Configure the formats of all the links in the graph.
 913  */
 914 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 915 {
 916     int ret;
 917
 918     /* find supported formats from sub-filters, and merge along links */
 919     if ((ret = query_formats(graph, log_ctx)) < 0)
 920         return ret;
 921
 922     /* Once everything is merged, it's possible that we'll still have
 923      * multiple valid media format choices. We try to minimize the amount
 924      * of format conversion inside filters */
 925     reduce_formats(graph);
 926
 927     /* for audio filters, ensure the best format, sample rate and channel layout
 928      * is selected */
 929     swap_sample_fmts(graph);
 930     swap_samplerates(graph);
 931     swap_channel_layouts(graph);
 932
 933     if ((ret = pick_formats(graph)) < 0)
 934         return ret;
 935
 936     return 0;
 937 }
 938
 939 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
 940                                              AVClass *log_ctx)
 941 {
 942     unsigned i, j;
 943     int sink_links_count = 0, n = 0;
 944     AVFilterContext *f;
 945     AVFilterLink **sinks;
 946
 947     for (i = 0; i < graph->filter_count; i++) {
 948         f = graph->filters[i];
 949         for (j = 0; j < f->nb_inputs; j++) {
 950             f->inputs[j]->graph     = graph;
 951             f->inputs[j]->age_index = -1;
 952         }
 953         for (j = 0; j < f->nb_outputs; j++) {
 954             f->outputs[j]->graph    = graph;
 955             f->outputs[j]->age_index= -1;
 956         }
 957         if (!f->nb_outputs) {
 958             if (f->nb_inputs > INT_MAX - sink_links_count)
 959                 return AVERROR(EINVAL);
 960             sink_links_count += f->nb_inputs;
 961         }
 962     }
 963     sinks = av_calloc(sink_links_count, sizeof(*sinks));
 964     if (!sinks)
 965         return AVERROR(ENOMEM);
 966     for (i = 0; i < graph->filter_count; i++) {
 967         f = graph->filters[i];
 968         if (!f->nb_outputs) {
 969             for (j = 0; j < f->nb_inputs; j++) {
 970                 sinks[n] = f->inputs[j];
 971                 f->inputs[j]->age_index = n++;
 972             }
 973         }
 974     }
 975     av_assert0(n == sink_links_count);
 976     graph->sink_links       = sinks;
 977     graph->sink_links_count = sink_links_count;
 978     return 0;
 979 }
 980
 981 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
 982 {
 983     AVFilterContext *f;
 984     int i, j, ret;
 985     int fifo_count = 0;
 986
 987     for (i = 0; i < graph->filter_count; i++) {
 988         f = graph->filters[i];
 989
 990         for (j = 0; j < f->nb_inputs; j++) {
 991             AVFilterLink *link = f->inputs[j];
 992             AVFilterContext *fifo_ctx;
 993             AVFilter *fifo;
 994             char name[32];
 995
 996             if (!link->dstpad->needs_fifo)
 997                 continue;
 998
 999             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
1000                    avfilter_get_by_name("fifo") :
1001                    avfilter_get_by_name("afifo");
1002
1003             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
1004
1005             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
1006                                                NULL, graph);
1007             if (ret < 0)
1008                 return ret;
1009
1010             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
1011             if (ret < 0)
1012                 return ret;
1013         }
1014     }
1015
1016     return 0;
1017 }
1018
1019 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
1020 {
1021     int ret;
1022
1023     if ((ret = graph_check_validity(graphctx, log_ctx)))
1024         return ret;
1025     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
1026         return ret;
1027     if ((ret = graph_config_formats(graphctx, log_ctx)))
1028         return ret;
1029     if ((ret = graph_config_links(graphctx, log_ctx)))
1030         return ret;
1031     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
1032         return ret;
1033
1034     return 0;
1035 }
1036
1037 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
1038 {
1039     int i, r = AVERROR(ENOSYS);
1040
1041     if(!graph)
1042         return r;
1043
1044     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
1045         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
1046         if(r != AVERROR(ENOSYS))
1047             return r;
1048     }
1049
1050     if(res_len && res)
1051         res[0]= 0;
1052
1053     for (i = 0; i < graph->filter_count; i++) {
1054         AVFilterContext *filter = graph->filters[i];
1055         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
1056             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
1057             if(r != AVERROR(ENOSYS)) {
1058                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
1059                     return r;
1060             }
1061         }
1062     }
1063
1064     return r;
1065 }
1066
1067 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
1068 {
1069     int i;
1070
1071     if(!graph)
1072         return 0;
1073
1074     for (i = 0; i < graph->filter_count; i++) {
1075         AVFilterContext *filter = graph->filters[i];
1076         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
1077             AVFilterCommand **queue = &filter->command_queue, *next;
1078             while (*queue && (*queue)->time <= ts)
1079                 queue = &(*queue)->next;
1080             next = *queue;
1081             *queue = av_mallocz(sizeof(AVFilterCommand));
1082             (*queue)->command = av_strdup(command);
1083             (*queue)->arg     = av_strdup(arg);
1084             (*queue)->time    = ts;
1085             (*queue)->flags   = flags;
1086             (*queue)->next    = next;
1087             if(flags & AVFILTER_CMD_FLAG_ONE)
1088                 return 0;
1089         }
1090     }
1091
1092     return 0;
1093 }
1094
1095 static void heap_bubble_up(AVFilterGraph *graph,
1096                            AVFilterLink *link, int index)
1097 {
1098     AVFilterLink **links = graph->sink_links;
1099
1100     while (index) {
1101         int parent = (index - 1) >> 1;
1102         if (links[parent]->current_pts >= link->current_pts)
1103             break;
1104         links[index] = links[parent];
1105         links[index]->age_index = index;
1106         index = parent;
1107     }
1108     links[index] = link;
1109     link->age_index = index;
1110 }
1111
1112 static void heap_bubble_down(AVFilterGraph *graph,
1113                              AVFilterLink *link, int index)
1114 {
1115     AVFilterLink **links = graph->sink_links;
1116
1117     while (1) {
1118         int child = 2 * index + 1;
1119         if (child >= graph->sink_links_count)
1120             break;
1121         if (child + 1 < graph->sink_links_count &&
1122             links[child + 1]->current_pts < links[child]->current_pts)
1123             child++;
1124         if (link->current_pts < links[child]->current_pts)
1125             break;
1126         links[index] = links[child];
1127         links[index]->age_index = index;
1128         index = child;
1129     }
1130     links[index] = link;
1131     link->age_index = index;
1132 }
1133
1134 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
1135 {
1136     heap_bubble_up  (graph, link, link->age_index);
1137     heap_bubble_down(graph, link, link->age_index);
1138 }
1139
1140
1141 int avfilter_graph_request_oldest(AVFilterGraph *graph)
1142 {
1143     while (graph->sink_links_count) {
1144         AVFilterLink *oldest = graph->sink_links[0];
1145         int r = ff_request_frame(oldest);
1146         if (r != AVERROR_EOF)
1147             return r;
1148         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
1149                oldest->dst ? oldest->dst->name : "unknown",
1150                oldest->dstpad ? oldest->dstpad->name : "unknown");
1151         /* EOF: remove the link from the heap */
1152         if (oldest->age_index < --graph->sink_links_count)
1153             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
1154                              oldest->age_index);
1155         oldest->age_index = -1;
1156     }
1157     return AVERROR_EOF;
1158 }