libavfilter/avfilter.c

   1 /*
   2  * filter layer
   3  * Copyright (c) 2007 Bobby Bingham
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/channel_layout.h"
  24 #include "libavutil/common.h"
  25 #include "libavutil/imgutils.h"
  26 #include "libavutil/internal.h"
  27 #include "libavutil/opt.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "libavutil/rational.h"
  30 #include "libavutil/samplefmt.h"
  31
  32 #include "audio.h"
  33 #include "avfilter.h"
  34 #include "formats.h"
  35 #include "internal.h"
  36 #include "video.h"
  37
  38 unsigned avfilter_version(void)
  39 {
  40     return LIBAVFILTER_VERSION_INT;
  41 }
  42
  43 const char *avfilter_configuration(void)
  44 {
  45     return LIBAV_CONFIGURATION;
  46 }
  47
  48 const char *avfilter_license(void)
  49 {
  50 #define LICENSE_PREFIX "libavfilter license: "
  51     return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
  52 }
  53
  54 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
  55                    AVFilterPad **pads, AVFilterLink ***links,
  56                    AVFilterPad *newpad)
  57 {
  58     unsigned i;
  59
  60     idx = FFMIN(idx, *count);
  61
  62     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
  63     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
  64     memmove(*pads  + idx + 1, *pads  + idx, sizeof(AVFilterPad)   * (*count - idx));
  65     memmove(*links + idx + 1, *links + idx, sizeof(AVFilterLink*) * (*count - idx));
  66     memcpy(*pads + idx, newpad, sizeof(AVFilterPad));
  67     (*links)[idx] = NULL;
  68
  69     (*count)++;
  70     for (i = idx + 1; i < *count; i++)
  71         if (*links[i])
  72             (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
  73 }
  74
  75 int avfilter_link(AVFilterContext *src, unsigned srcpad,
  76                   AVFilterContext *dst, unsigned dstpad)
  77 {
  78     AVFilterLink *link;
  79
  80     if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
  81         src->outputs[srcpad]      || dst->inputs[dstpad])
  82         return -1;
  83
  84     if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
  85         av_log(src, AV_LOG_ERROR,
  86                "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
  87                src->name, srcpad, dst->name, dstpad);
  88         return AVERROR(EINVAL);
  89     }
  90
  91     link = av_mallocz(sizeof(*link));
  92     if (!link)
  93         return AVERROR(ENOMEM);
  94
  95     src->outputs[srcpad] = dst->inputs[dstpad] = link;
  96
  97     link->src     = src;
  98     link->dst     = dst;
  99     link->srcpad  = &src->output_pads[srcpad];
 100     link->dstpad  = &dst->input_pads[dstpad];
 101     link->type    = src->output_pads[srcpad].type;
 102     assert(AV_PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
 103     link->format  = -1;
 104
 105     return 0;
 106 }
 107
 108 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
 109                            unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
 110 {
 111     int ret;
 112     unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
 113
 114     av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
 115            "between the filter '%s' and the filter '%s'\n",
 116            filt->name, link->src->name, link->dst->name);
 117
 118     link->dst->inputs[dstpad_idx] = NULL;
 119     if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
 120         /* failed to link output filter to new filter */
 121         link->dst->inputs[dstpad_idx] = link;
 122         return ret;
 123     }
 124
 125     /* re-hookup the link to the new destination filter we inserted */
 126     link->dst                     = filt;
 127     link->dstpad                  = &filt->input_pads[filt_srcpad_idx];
 128     filt->inputs[filt_srcpad_idx] = link;
 129
 130     /* if any information on supported media formats already exists on the
 131      * link, we need to preserve that */
 132     if (link->out_formats)
 133         ff_formats_changeref(&link->out_formats,
 134                              &filt->outputs[filt_dstpad_idx]->out_formats);
 135     if (link->out_samplerates)
 136         ff_formats_changeref(&link->out_samplerates,
 137                              &filt->outputs[filt_dstpad_idx]->out_samplerates);
 138     if (link->out_channel_layouts)
 139         ff_channel_layouts_changeref(&link->out_channel_layouts,
 140                                      &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
 141
 142     return 0;
 143 }
 144
 145 int avfilter_config_links(AVFilterContext *filter)
 146 {
 147     int (*config_link)(AVFilterLink *);
 148     unsigned i;
 149     int ret;
 150
 151     for (i = 0; i < filter->nb_inputs; i ++) {
 152         AVFilterLink *link = filter->inputs[i];
 153
 154         if (!link) continue;
 155
 156         switch (link->init_state) {
 157         case AVLINK_INIT:
 158             continue;
 159         case AVLINK_STARTINIT:
 160             av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
 161             return 0;
 162         case AVLINK_UNINIT:
 163             link->init_state = AVLINK_STARTINIT;
 164
 165             if ((ret = avfilter_config_links(link->src)) < 0)
 166                 return ret;
 167
 168             if (!(config_link = link->srcpad->config_props)) {
 169                 if (link->src->nb_inputs != 1) {
 170                     av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
 171                                                     "with more than one input "
 172                                                     "must set config_props() "
 173                                                     "callbacks on all outputs\n");
 174                     return AVERROR(EINVAL);
 175                 }
 176             } else if ((ret = config_link(link)) < 0) {
 177                 av_log(link->src, AV_LOG_ERROR,
 178                        "Failed to configure output pad on %s\n",
 179                        link->src->name);
 180                 return ret;
 181             }
 182
 183             if (link->time_base.num == 0 && link->time_base.den == 0)
 184                 link->time_base = link->src && link->src->nb_inputs ?
 185                     link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
 186
 187             if (link->type == AVMEDIA_TYPE_VIDEO) {
 188                 if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
 189                     link->sample_aspect_ratio = link->src->nb_inputs ?
 190                         link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
 191
 192                 if (link->src->nb_inputs) {
 193                     if (!link->w)
 194                         link->w = link->src->inputs[0]->w;
 195                     if (!link->h)
 196                         link->h = link->src->inputs[0]->h;
 197                 } else if (!link->w || !link->h) {
 198                     av_log(link->src, AV_LOG_ERROR,
 199                            "Video source filters must set their output link's "
 200                            "width and height\n");
 201                     return AVERROR(EINVAL);
 202                 }
 203             }
 204
 205             if ((config_link = link->dstpad->config_props))
 206                 if ((ret = config_link(link)) < 0) {
 207                     av_log(link->src, AV_LOG_ERROR,
 208                            "Failed to configure input pad on %s\n",
 209                            link->dst->name);
 210                     return ret;
 211                 }
 212
 213             link->init_state = AVLINK_INIT;
 214         }
 215     }
 216
 217     return 0;
 218 }
 219
 220 void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
 221 {
 222     if (link->type == AVMEDIA_TYPE_VIDEO) {
 223         av_dlog(ctx,
 224                 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
 225                 link, link->w, link->h,
 226                 av_get_pix_fmt_name(link->format),
 227                 link->src ? link->src->filter->name : "",
 228                 link->dst ? link->dst->filter->name : "",
 229                 end ? "\n" : "");
 230     } else {
 231         char buf[128];
 232         av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
 233
 234         av_dlog(ctx,
 235                 "link[%p r:%d cl:%s fmt:%-16s %-16s->%-16s]%s",
 236                 link, link->sample_rate, buf,
 237                 av_get_sample_fmt_name(link->format),
 238                 link->src ? link->src->filter->name : "",
 239                 link->dst ? link->dst->filter->name : "",
 240                 end ? "\n" : "");
 241     }
 242 }
 243
 244 int ff_request_frame(AVFilterLink *link)
 245 {
 246     FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
 247
 248     if (link->srcpad->request_frame)
 249         return link->srcpad->request_frame(link);
 250     else if (link->src->inputs[0])
 251         return ff_request_frame(link->src->inputs[0]);
 252     else return -1;
 253 }
 254
 255 int ff_poll_frame(AVFilterLink *link)
 256 {
 257     int i, min = INT_MAX;
 258
 259     if (link->srcpad->poll_frame)
 260         return link->srcpad->poll_frame(link);
 261
 262     for (i = 0; i < link->src->nb_inputs; i++) {
 263         int val;
 264         if (!link->src->inputs[i])
 265             return -1;
 266         val = ff_poll_frame(link->src->inputs[i]);
 267         min = FFMIN(min, val);
 268     }
 269
 270     return min;
 271 }
 272
 273 static AVFilter *first_filter;
 274
 275 #if !FF_API_NOCONST_GET_NAME
 276 const
 277 #endif
 278 AVFilter *avfilter_get_by_name(const char *name)
 279 {
 280     const AVFilter *f = NULL;
 281
 282     if (!name)
 283         return NULL;
 284
 285     while ((f = avfilter_next(f)))
 286         if (!strcmp(f->name, name))
 287             return f;
 288
 289     return NULL;
 290 }
 291
 292 int avfilter_register(AVFilter *filter)
 293 {
 294     AVFilter **f = &first_filter;
 295     while (*f)
 296         f = &(*f)->next;
 297     *f = filter;
 298     filter->next = NULL;
 299     return 0;
 300 }
 301
 302 const AVFilter *avfilter_next(const AVFilter *prev)
 303 {
 304     return prev ? prev->next : first_filter;
 305 }
 306
 307 #if FF_API_OLD_FILTER_REGISTER
 308 AVFilter **av_filter_next(AVFilter **filter)
 309 {
 310     return filter ? &(*filter)->next : &first_filter;
 311 }
 312
 313 void avfilter_uninit(void)
 314 {
 315 }
 316 #endif
 317
 318 int avfilter_pad_count(const AVFilterPad *pads)
 319 {
 320     int count;
 321
 322     if (!pads)
 323         return 0;
 324
 325     for (count = 0; pads->name; count++)
 326         pads++;
 327     return count;
 328 }
 329
 330 static const char *filter_name(void *p)
 331 {
 332     AVFilterContext *filter = p;
 333     return filter->filter->name;
 334 }
 335
 336 static void *filter_child_next(void *obj, void *prev)
 337 {
 338     AVFilterContext *ctx = obj;
 339     if (!prev && ctx->filter && ctx->filter->priv_class && ctx->priv)
 340         return ctx->priv;
 341     return NULL;
 342 }
 343
 344 static const AVClass *filter_child_class_next(const AVClass *prev)
 345 {
 346     const AVFilter *f = NULL;
 347
 348     while (prev && (f = avfilter_next(f)))
 349         if (f->priv_class == prev)
 350             break;
 351
 352     while ((f = avfilter_next(f)))
 353         if (f->priv_class)
 354             return f->priv_class;
 355
 356     return NULL;
 357 }
 358
 359 #define OFFSET(x) offsetof(AVFilterContext, x)
 360 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
 361 static const AVOption avfilter_options[] = {
 362     { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
 363         { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
 364         { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .unit = "thread_type" },
 365     { NULL },
 366 };
 367
 368 static const AVClass avfilter_class = {
 369     .class_name = "AVFilter",
 370     .item_name  = filter_name,
 371     .version    = LIBAVUTIL_VERSION_INT,
 372     .child_next = filter_child_next,
 373     .child_class_next = filter_child_class_next,
 374     .option           = avfilter_options,
 375 };
 376
 377 static int default_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg,
 378                            int *ret, int nb_jobs)
 379 {
 380     int i;
 381
 382     for (i = 0; i < nb_jobs; i++) {
 383         int r = func(ctx, arg, i, nb_jobs);
 384         if (ret)
 385             ret[i] = r;
 386     }
 387     return 0;
 388 }
 389
 390 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
 391 {
 392     AVFilterContext *ret;
 393
 394     if (!filter)
 395         return NULL;
 396
 397     ret = av_mallocz(sizeof(AVFilterContext));
 398     if (!ret)
 399         return NULL;
 400
 401     ret->av_class = &avfilter_class;
 402     ret->filter   = filter;
 403     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
 404     if (filter->priv_size) {
 405         ret->priv     = av_mallocz(filter->priv_size);
 406         if (!ret->priv)
 407             goto err;
 408     }
 409
 410     av_opt_set_defaults(ret);
 411     if (filter->priv_class) {
 412         *(const AVClass**)ret->priv = filter->priv_class;
 413         av_opt_set_defaults(ret->priv);
 414     }
 415
 416     ret->internal = av_mallocz(sizeof(*ret->internal));
 417     if (!ret->internal)
 418         goto err;
 419     ret->internal->execute = default_execute;
 420
 421     ret->nb_inputs = avfilter_pad_count(filter->inputs);
 422     if (ret->nb_inputs ) {
 423         ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
 424         if (!ret->input_pads)
 425             goto err;
 426         memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
 427         ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs);
 428         if (!ret->inputs)
 429             goto err;
 430     }
 431
 432     ret->nb_outputs = avfilter_pad_count(filter->outputs);
 433     if (ret->nb_outputs) {
 434         ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
 435         if (!ret->output_pads)
 436             goto err;
 437         memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
 438         ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs);
 439         if (!ret->outputs)
 440             goto err;
 441     }
 442 #if FF_API_FOO_COUNT
 443 FF_DISABLE_DEPRECATION_WARNINGS
 444     ret->output_count = ret->nb_outputs;
 445     ret->input_count  = ret->nb_inputs;
 446 FF_ENABLE_DEPRECATION_WARNINGS
 447 #endif
 448
 449     return ret;
 450
 451 err:
 452     av_freep(&ret->inputs);
 453     av_freep(&ret->input_pads);
 454     ret->nb_inputs = 0;
 455     av_freep(&ret->outputs);
 456     av_freep(&ret->output_pads);
 457     ret->nb_outputs = 0;
 458     av_freep(&ret->priv);
 459     av_freep(&ret->internal);
 460     av_free(ret);
 461     return NULL;
 462 }
 463
 464 #if FF_API_AVFILTER_OPEN
 465 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
 466 {
 467     *filter_ctx = ff_filter_alloc(filter, inst_name);
 468     return *filter_ctx ? 0 : AVERROR(ENOMEM);
 469 }
 470 #endif
 471
 472 static void free_link(AVFilterLink *link)
 473 {
 474     if (!link)
 475         return;
 476
 477     if (link->src)
 478         link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
 479     if (link->dst)
 480         link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
 481
 482     ff_formats_unref(&link->in_formats);
 483     ff_formats_unref(&link->out_formats);
 484     ff_formats_unref(&link->in_samplerates);
 485     ff_formats_unref(&link->out_samplerates);
 486     ff_channel_layouts_unref(&link->in_channel_layouts);
 487     ff_channel_layouts_unref(&link->out_channel_layouts);
 488     av_freep(&link);
 489 }
 490
 491 void avfilter_free(AVFilterContext *filter)
 492 {
 493     int i;
 494
 495     if (filter->graph)
 496         ff_filter_graph_remove_filter(filter->graph, filter);
 497
 498     if (filter->filter->uninit)
 499         filter->filter->uninit(filter);
 500
 501     for (i = 0; i < filter->nb_inputs; i++) {
 502         free_link(filter->inputs[i]);
 503     }
 504     for (i = 0; i < filter->nb_outputs; i++) {
 505         free_link(filter->outputs[i]);
 506     }
 507
 508     if (filter->filter->priv_class)
 509         av_opt_free(filter->priv);
 510
 511     av_freep(&filter->name);
 512     av_freep(&filter->input_pads);
 513     av_freep(&filter->output_pads);
 514     av_freep(&filter->inputs);
 515     av_freep(&filter->outputs);
 516     av_freep(&filter->priv);
 517     av_freep(&filter->internal);
 518     av_free(filter);
 519 }
 520
 521 /* process a list of value1:value2:..., each value corresponding
 522  * to subsequent AVOption, in the order they are declared */
 523 static int process_unnamed_options(AVFilterContext *ctx, AVDictionary **options,
 524                                    const char *args)
 525 {
 526     const AVOption *o = NULL;
 527     const char *p = args;
 528     char *val;
 529
 530     while (*p) {
 531         o = av_opt_next(ctx->priv, o);
 532         if (!o) {
 533             av_log(ctx, AV_LOG_ERROR, "More options provided than "
 534                    "this filter supports.\n");
 535             return AVERROR(EINVAL);
 536         }
 537         if (o->type == AV_OPT_TYPE_CONST)
 538             continue;
 539
 540         val = av_get_token(&p, ":");
 541         if (!val)
 542             return AVERROR(ENOMEM);
 543
 544         av_dict_set(options, o->name, val, 0);
 545
 546         av_freep(&val);
 547         if (*p)
 548             p++;
 549     }
 550
 551     return 0;
 552 }
 553
 554 #if FF_API_AVFILTER_INIT_FILTER
 555 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
 556 {
 557     return avfilter_init_str(filter, args);
 558 }
 559 #endif
 560
 561 int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
 562 {
 563     int ret = 0;
 564
 565     ret = av_opt_set_dict(ctx, options);
 566     if (ret < 0) {
 567         av_log(ctx, AV_LOG_ERROR, "Error applying generic filter options.\n");
 568         return ret;
 569     }
 570
 571     if (ctx->filter->flags & AVFILTER_FLAG_SLICE_THREADS &&
 572         ctx->thread_type & ctx->graph->thread_type & AVFILTER_THREAD_SLICE &&
 573         ctx->graph->internal->thread_execute) {
 574         ctx->thread_type       = AVFILTER_THREAD_SLICE;
 575         ctx->internal->execute = ctx->graph->internal->thread_execute;
 576     } else {
 577         ctx->thread_type = 0;
 578     }
 579
 580     if (ctx->filter->priv_class) {
 581         ret = av_opt_set_dict(ctx->priv, options);
 582         if (ret < 0) {
 583             av_log(ctx, AV_LOG_ERROR, "Error applying options to the filter.\n");
 584             return ret;
 585         }
 586     }
 587
 588     if (ctx->filter->init)
 589         ret = ctx->filter->init(ctx);
 590     else if (ctx->filter->init_dict)
 591         ret = ctx->filter->init_dict(ctx, options);
 592
 593     return ret;
 594 }
 595
 596 int avfilter_init_str(AVFilterContext *filter, const char *args)
 597 {
 598     AVDictionary *options = NULL;
 599     AVDictionaryEntry *e;
 600     int ret = 0;
 601
 602     if (args && *args) {
 603         if (!filter->filter->priv_class) {
 604             av_log(filter, AV_LOG_ERROR, "This filter does not take any "
 605                    "options, but options were provided: %s.\n", args);
 606             return AVERROR(EINVAL);
 607         }
 608
 609 #if FF_API_OLD_FILTER_OPTS
 610         if (!strcmp(filter->filter->name, "scale") &&
 611             strchr(args, ':') && strchr(args, ':') < strchr(args, '=')) {
 612             /* old w:h:flags=<flags> syntax */
 613             char *copy = av_strdup(args);
 614             char *p;
 615
 616             av_log(filter, AV_LOG_WARNING, "The <w>:<h>:flags=<flags> option "
 617                    "syntax is deprecated. Use either <w>:<h>:<flags> or "
 618                    "w=<w>:h=<h>:flags=<flags>.\n");
 619
 620             if (!copy) {
 621                 ret = AVERROR(ENOMEM);
 622                 goto fail;
 623             }
 624
 625             p = strrchr(copy, ':');
 626             if (p) {
 627                 *p++ = 0;
 628                 ret = av_dict_parse_string(&options, p, "=", ":", 0);
 629             }
 630             if (ret >= 0)
 631                 ret = process_unnamed_options(filter, &options, copy);
 632             av_freep(&copy);
 633
 634             if (ret < 0)
 635                 goto fail;
 636         } else
 637 #endif
 638
 639         if (strchr(args, '=')) {
 640             /* assume a list of key1=value1:key2=value2:... */
 641             ret = av_dict_parse_string(&options, args, "=", ":", 0);
 642             if (ret < 0)
 643                 goto fail;
 644 #if FF_API_OLD_FILTER_OPTS
 645         } else if (!strcmp(filter->filter->name, "format")     ||
 646                    !strcmp(filter->filter->name, "noformat")   ||
 647                    !strcmp(filter->filter->name, "frei0r")     ||
 648                    !strcmp(filter->filter->name, "frei0r_src") ||
 649                    !strcmp(filter->filter->name, "ocv")) {
 650             /* a hack for compatibility with the old syntax
 651              * replace colons with |s */
 652             char *copy = av_strdup(args);
 653             char *p    = copy;
 654             int nb_leading = 0; // number of leading colons to skip
 655
 656             if (!copy) {
 657                 ret = AVERROR(ENOMEM);
 658                 goto fail;
 659             }
 660
 661             if (!strcmp(filter->filter->name, "frei0r") ||
 662                 !strcmp(filter->filter->name, "ocv"))
 663                 nb_leading = 1;
 664             else if (!strcmp(filter->filter->name, "frei0r_src"))
 665                 nb_leading = 3;
 666
 667             while (nb_leading--) {
 668                 p = strchr(p, ':');
 669                 if (!p) {
 670                     p = copy + strlen(copy);
 671                     break;
 672                 }
 673                 p++;
 674             }
 675
 676             if (strchr(p, ':')) {
 677                 av_log(filter, AV_LOG_WARNING, "This syntax is deprecated. Use "
 678                        "'|' to separate the list items.\n");
 679             }
 680
 681             while ((p = strchr(p, ':')))
 682                 *p++ = '|';
 683
 684             ret = process_unnamed_options(filter, &options, copy);
 685             av_freep(&copy);
 686
 687             if (ret < 0)
 688                 goto fail;
 689 #endif
 690         } else {
 691             ret = process_unnamed_options(filter, &options, args);
 692             if (ret < 0)
 693                 goto fail;
 694         }
 695     }
 696
 697     ret = avfilter_init_dict(filter, &options);
 698     if (ret < 0)
 699         goto fail;
 700
 701     if ((e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
 702         av_log(filter, AV_LOG_ERROR, "No such option: %s.\n", e->key);
 703         ret = AVERROR_OPTION_NOT_FOUND;
 704         goto fail;
 705     }
 706
 707 fail:
 708     av_dict_free(&options);
 709
 710     return ret;
 711 }
 712
 713 const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
 714 {
 715     return pads[pad_idx].name;
 716 }
 717
 718 enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
 719 {
 720     return pads[pad_idx].type;
 721 }
 722
 723 static int default_filter_frame(AVFilterLink *link, AVFrame *frame)
 724 {
 725     return ff_filter_frame(link->dst->outputs[0], frame);
 726 }
 727
 728 int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
 729 {
 730     int (*filter_frame)(AVFilterLink *, AVFrame *);
 731     AVFilterPad *dst = link->dstpad;
 732     AVFrame *out;
 733
 734     FF_DPRINTF_START(NULL, filter_frame);
 735     ff_dlog_link(NULL, link, 1);
 736
 737     if (!(filter_frame = dst->filter_frame))
 738         filter_frame = default_filter_frame;
 739
 740     /* copy the frame if needed */
 741     if (dst->needs_writable && !av_frame_is_writable(frame)) {
 742         av_log(link->dst, AV_LOG_DEBUG, "Copying data in avfilter.\n");
 743
 744         switch (link->type) {
 745         case AVMEDIA_TYPE_VIDEO:
 746             out = ff_get_video_buffer(link, link->w, link->h);
 747             break;
 748         case AVMEDIA_TYPE_AUDIO:
 749             out = ff_get_audio_buffer(link, frame->nb_samples);
 750             break;
 751         default: return AVERROR(EINVAL);
 752         }
 753         if (!out) {
 754             av_frame_free(&frame);
 755             return AVERROR(ENOMEM);
 756         }
 757         av_frame_copy_props(out, frame);
 758
 759         switch (link->type) {
 760         case AVMEDIA_TYPE_VIDEO:
 761             av_image_copy(out->data, out->linesize, frame->data, frame->linesize,
 762                           frame->format, frame->width, frame->height);
 763             break;
 764         case AVMEDIA_TYPE_AUDIO:
 765             av_samples_copy(out->extended_data, frame->extended_data,
 766                             0, 0, frame->nb_samples,
 767                             av_get_channel_layout_nb_channels(frame->channel_layout),
 768                             frame->format);
 769             break;
 770         default: return AVERROR(EINVAL);
 771         }
 772
 773         av_frame_free(&frame);
 774     } else
 775         out = frame;
 776
 777     return filter_frame(link, out);
 778 }
 779
 780 const AVClass *avfilter_get_class(void)
 781 {
 782     return &avfilter_class;
 783 }