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

   1 /*
   2  * Filter layer - format negotiation
   3  * Copyright (c) 2007 Bobby Bingham
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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/avassert.h"
  23 #include "libavutil/channel_layout.h"
  24 #include "libavutil/common.h"
  25 #include "libavutil/eval.h"
  26 #include "libavutil/pixdesc.h"
  27 #include "libavutil/parseutils.h"
  28 #include "avfilter.h"
  29 #include "internal.h"
  30 #include "formats.h"
  31
  32 #define KNOWN(l) (!FF_LAYOUT2COUNT(l)) /* for readability */
  33
  34 /**
  35  * Add all refs from a to ret and destroy a.
  36  */
  37 #define MERGE_REF(ret, a, fmts, type, fail)                                \
  38 do {                                                                       \
  39     type ***tmp;                                                           \
  40     int i;                                                                 \
  41                                                                            \
  42     if (!(tmp = av_realloc(ret->refs,                                      \
  43                            sizeof(*tmp) * (ret->refcount + a->refcount)))) \
  44         goto fail;                                                         \
  45     ret->refs = tmp;                                                       \
  46                                                                            \
  47     for (i = 0; i < a->refcount; i ++) {                                   \
  48         ret->refs[ret->refcount] = a->refs[i];                             \
  49         *ret->refs[ret->refcount++] = ret;                                 \
  50     }                                                                      \
  51                                                                            \
  52     av_freep(&a->refs);                                                    \
  53     av_freep(&a->fmts);                                                    \
  54     av_freep(&a);                                                          \
  55 } while (0)
  56
  57 /**
  58  * Add all formats common for a and b to ret, copy the refs and destroy
  59  * a and b.
  60  */
  61 #define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail)                          \
  62 do {                                                                            \
  63     int i, j, k = 0, count = FFMIN(a->nb, b->nb);                               \
  64                                                                                 \
  65     if (!(ret = av_mallocz(sizeof(*ret))))                                      \
  66         goto fail;                                                              \
  67                                                                                 \
  68     if (count) {                                                                \
  69         if (!(ret->fmts = av_malloc(sizeof(*ret->fmts) * count)))               \
  70             goto fail;                                                          \
  71         for (i = 0; i < a->nb; i++)                                             \
  72             for (j = 0; j < b->nb; j++)                                         \
  73                 if (a->fmts[i] == b->fmts[j]) {                                 \
  74                     if(k >= FFMIN(a->nb, b->nb)){                               \
  75                         av_log(NULL, AV_LOG_ERROR, "Duplicate formats in avfilter_merge_formats() detected\n"); \
  76                         av_free(ret->fmts);                                     \
  77                         av_free(ret);                                           \
  78                         return NULL;                                            \
  79                     }                                                           \
  80                     ret->fmts[k++] = a->fmts[i];                                \
  81                 }                                                               \
  82     }                                                                           \
  83     ret->nb = k;                                                                \
  84     /* check that there was at least one common format */                       \
  85     if (!ret->nb)                                                               \
  86         goto fail;                                                              \
  87                                                                                 \
  88     MERGE_REF(ret, a, fmts, type, fail);                                        \
  89     MERGE_REF(ret, b, fmts, type, fail);                                        \
  90 } while (0)
  91
  92 AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
  93 {
  94     AVFilterFormats *ret = NULL;
  95
  96     if (a == b)
  97         return a;
  98
  99     MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
 100
 101     return ret;
 102 fail:
 103     if (ret) {
 104         av_freep(&ret->refs);
 105         av_freep(&ret->formats);
 106     }
 107     av_freep(&ret);
 108     return NULL;
 109 }
 110
 111 AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
 112                                       AVFilterFormats *b)
 113 {
 114     AVFilterFormats *ret = NULL;
 115
 116     if (a == b) return a;
 117
 118     if (a->format_count && b->format_count) {
 119         MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
 120     } else if (a->format_count) {
 121         MERGE_REF(a, b, formats, AVFilterFormats, fail);
 122         ret = a;
 123     } else {
 124         MERGE_REF(b, a, formats, AVFilterFormats, fail);
 125         ret = b;
 126     }
 127
 128     return ret;
 129 fail:
 130     if (ret) {
 131         av_freep(&ret->refs);
 132         av_freep(&ret->formats);
 133     }
 134     av_freep(&ret);
 135     return NULL;
 136 }
 137
 138 AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
 139                                                  AVFilterChannelLayouts *b)
 140 {
 141     AVFilterChannelLayouts *ret = NULL;
 142     unsigned a_all = a->all_layouts + a->all_counts;
 143     unsigned b_all = b->all_layouts + b->all_counts;
 144     int ret_max, ret_nb = 0, i, j, round;
 145
 146     if (a == b) return a;
 147
 148     /* Put the most generic set in a, to avoid doing everything twice */
 149     if (a_all < b_all) {
 150         FFSWAP(AVFilterChannelLayouts *, a, b);
 151         FFSWAP(unsigned, a_all, b_all);
 152     }
 153     if (a_all) {
 154         if (a_all == 1 && !b_all) {
 155             /* keep only known layouts in b; works also for b_all = 1 */
 156             for (i = j = 0; i < b->nb_channel_layouts; i++)
 157                 if (KNOWN(b->channel_layouts[i]))
 158                     b->channel_layouts[j++] = b->channel_layouts[i];
 159             b->nb_channel_layouts = j;
 160         }
 161         MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
 162         return b;
 163     }
 164
 165     ret_max = a->nb_channel_layouts + b->nb_channel_layouts;
 166     if (!(ret = av_mallocz(sizeof(*ret))) ||
 167         !(ret->channel_layouts = av_malloc(sizeof(*ret->channel_layouts) *
 168                                            ret_max)))
 169         goto fail;
 170
 171     /* a[known] intersect b[known] */
 172     for (i = 0; i < a->nb_channel_layouts; i++) {
 173         if (!KNOWN(a->channel_layouts[i]))
 174             continue;
 175         for (j = 0; j < b->nb_channel_layouts; j++) {
 176             if (a->channel_layouts[i] == b->channel_layouts[j]) {
 177                 ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
 178                 a->channel_layouts[i] = b->channel_layouts[j] = 0;
 179             }
 180         }
 181     }
 182     /* 1st round: a[known] intersect b[generic]
 183        2nd round: a[generic] intersect b[known] */
 184     for (round = 0; round < 2; round++) {
 185         for (i = 0; i < a->nb_channel_layouts; i++) {
 186             uint64_t fmt = a->channel_layouts[i], bfmt;
 187             if (!fmt || !KNOWN(fmt))
 188                 continue;
 189             bfmt = FF_COUNT2LAYOUT(av_get_channel_layout_nb_channels(fmt));
 190             for (j = 0; j < b->nb_channel_layouts; j++)
 191                 if (b->channel_layouts[j] == bfmt)
 192                     ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
 193         }
 194         /* 1st round: swap to prepare 2nd round; 2nd round: put it back */
 195         FFSWAP(AVFilterChannelLayouts *, a, b);
 196     }
 197     /* a[generic] intersect b[generic] */
 198     for (i = 0; i < a->nb_channel_layouts; i++) {
 199         if (KNOWN(a->channel_layouts[i]))
 200             continue;
 201         for (j = 0; j < b->nb_channel_layouts; j++)
 202             if (a->channel_layouts[i] == b->channel_layouts[j])
 203                 ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
 204     }
 205
 206     ret->nb_channel_layouts = ret_nb;
 207     if (!ret->nb_channel_layouts)
 208         goto fail;
 209     MERGE_REF(ret, a, channel_layouts, AVFilterChannelLayouts, fail);
 210     MERGE_REF(ret, b, channel_layouts, AVFilterChannelLayouts, fail);
 211     return ret;
 212
 213 fail:
 214     if (ret) {
 215         av_freep(&ret->refs);
 216         av_freep(&ret->channel_layouts);
 217     }
 218     av_freep(&ret);
 219     return NULL;
 220 }
 221
 222 int ff_fmt_is_in(int fmt, const int *fmts)
 223 {
 224     const int *p;
 225
 226     for (p = fmts; *p != -1; p++) {
 227         if (fmt == *p)
 228             return 1;
 229     }
 230     return 0;
 231 }
 232
 233 #define COPY_INT_LIST(list_copy, list, type) {                          \
 234     int count = 0;                                                      \
 235     if (list)                                                           \
 236         for (count = 0; list[count] != -1; count++)                     \
 237             ;                                                           \
 238     list_copy = av_calloc(count+1, sizeof(type));                       \
 239     if (list_copy) {                                                    \
 240         memcpy(list_copy, list, sizeof(type) * count);                  \
 241         list_copy[count] = -1;                                          \
 242     }                                                                   \
 243 }
 244
 245 int *ff_copy_int_list(const int * const list)
 246 {
 247     int *ret = NULL;
 248     COPY_INT_LIST(ret, list, int);
 249     return ret;
 250 }
 251
 252 int64_t *ff_copy_int64_list(const int64_t * const list)
 253 {
 254     int64_t *ret = NULL;
 255     COPY_INT_LIST(ret, list, int64_t);
 256     return ret;
 257 }
 258
 259 #define MAKE_FORMAT_LIST(type, field, count_field)                      \
 260     type *formats;                                                      \
 261     int count = 0;                                                      \
 262     if (fmts)                                                           \
 263         for (count = 0; fmts[count] != -1; count++)                     \
 264             ;                                                           \
 265     formats = av_mallocz(sizeof(*formats));                             \
 266     if (!formats) return NULL;                                          \
 267     formats->count_field = count;                                       \
 268     if (count) {                                                        \
 269         formats->field = av_malloc(sizeof(*formats->field)*count);      \
 270         if (!formats->field) {                                          \
 271             av_free(formats);                                           \
 272             return NULL;                                                \
 273         }                                                               \
 274     }
 275
 276 AVFilterFormats *ff_make_format_list(const int *fmts)
 277 {
 278     MAKE_FORMAT_LIST(AVFilterFormats, formats, format_count);
 279     while (count--)
 280         formats->formats[count] = fmts[count];
 281
 282     return formats;
 283 }
 284
 285 AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts)
 286 {
 287     MAKE_FORMAT_LIST(AVFilterChannelLayouts,
 288                      channel_layouts, nb_channel_layouts);
 289     if (count)
 290         memcpy(formats->channel_layouts, fmts,
 291                sizeof(*formats->channel_layouts) * count);
 292
 293     return formats;
 294 }
 295
 296 #define ADD_FORMAT(f, fmt, type, list, nb)                  \
 297 do {                                                        \
 298     type *fmts;                                             \
 299                                                             \
 300     if (!(*f) && !(*f = av_mallocz(sizeof(**f))))           \
 301         return AVERROR(ENOMEM);                             \
 302                                                             \
 303     fmts = av_realloc((*f)->list,                           \
 304                       sizeof(*(*f)->list) * ((*f)->nb + 1));\
 305     if (!fmts)                                              \
 306         return AVERROR(ENOMEM);                             \
 307                                                             \
 308     (*f)->list = fmts;                                      \
 309     (*f)->list[(*f)->nb++] = fmt;                           \
 310 } while (0)
 311
 312 int ff_add_format(AVFilterFormats **avff, int64_t fmt)
 313 {
 314     ADD_FORMAT(avff, fmt, int, formats, format_count);
 315     return 0;
 316 }
 317
 318 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
 319 {
 320     av_assert1(!(*l && (*l)->all_layouts));
 321     ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
 322     return 0;
 323 }
 324
 325 AVFilterFormats *ff_all_formats(enum AVMediaType type)
 326 {
 327     AVFilterFormats *ret = NULL;
 328     int fmt;
 329     int num_formats = type == AVMEDIA_TYPE_VIDEO ? AV_PIX_FMT_NB    :
 330                       type == AVMEDIA_TYPE_AUDIO ? AV_SAMPLE_FMT_NB : 0;
 331
 332     for (fmt = 0; fmt < num_formats; fmt++) {
 333         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
 334         if ((type != AVMEDIA_TYPE_VIDEO) ||
 335             (type == AVMEDIA_TYPE_VIDEO && !(desc->flags & PIX_FMT_HWACCEL)))
 336             ff_add_format(&ret, fmt);
 337     }
 338
 339     return ret;
 340 }
 341
 342 const int64_t avfilter_all_channel_layouts[] = {
 343 #include "all_channel_layouts.inc"
 344     -1
 345 };
 346
 347 // AVFilterFormats *avfilter_make_all_channel_layouts(void)
 348 // {
 349 //     return avfilter_make_format64_list(avfilter_all_channel_layouts);
 350 // }
 351
 352 AVFilterFormats *ff_planar_sample_fmts(void)
 353 {
 354     AVFilterFormats *ret = NULL;
 355     int fmt;
 356
 357     for (fmt = 0; fmt < AV_SAMPLE_FMT_NB; fmt++)
 358         if (av_sample_fmt_is_planar(fmt))
 359             ff_add_format(&ret, fmt);
 360
 361     return ret;
 362 }
 363
 364 AVFilterFormats *ff_all_samplerates(void)
 365 {
 366     AVFilterFormats *ret = av_mallocz(sizeof(*ret));
 367     return ret;
 368 }
 369
 370 AVFilterChannelLayouts *ff_all_channel_layouts(void)
 371 {
 372     AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
 373     if (!ret)
 374         return NULL;
 375     ret->all_layouts = 1;
 376     return ret;
 377 }
 378
 379 AVFilterChannelLayouts *ff_all_channel_counts(void)
 380 {
 381     AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
 382     if (!ret)
 383         return NULL;
 384     ret->all_layouts = ret->all_counts = 1;
 385     return ret;
 386 }
 387
 388 #define FORMATS_REF(f, ref)                                          \
 389 do {                                                                 \
 390     *ref = f;                                                        \
 391     f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
 392     f->refs[f->refcount-1] = ref;                                    \
 393 } while (0)
 394
 395 void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
 396 {
 397     FORMATS_REF(f, ref);
 398 }
 399
 400 void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 401 {
 402     FORMATS_REF(f, ref);
 403 }
 404
 405 #define FIND_REF_INDEX(ref, idx)            \
 406 do {                                        \
 407     int i;                                  \
 408     for (i = 0; i < (*ref)->refcount; i ++) \
 409         if((*ref)->refs[i] == ref) {        \
 410             idx = i;                        \
 411             break;                          \
 412         }                                   \
 413 } while (0)
 414
 415 #define FORMATS_UNREF(ref, list)                                   \
 416 do {                                                               \
 417     int idx = -1;                                                  \
 418                                                                    \
 419     if (!*ref)                                                     \
 420         return;                                                    \
 421                                                                    \
 422     FIND_REF_INDEX(ref, idx);                                      \
 423                                                                    \
 424     if (idx >= 0)                                                  \
 425         memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,        \
 426             sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
 427                                                                    \
 428     if(!--(*ref)->refcount) {                                      \
 429         av_free((*ref)->list);                                     \
 430         av_free((*ref)->refs);                                     \
 431         av_free(*ref);                                             \
 432     }                                                              \
 433     *ref = NULL;                                                   \
 434 } while (0)
 435
 436 void ff_formats_unref(AVFilterFormats **ref)
 437 {
 438     FORMATS_UNREF(ref, formats);
 439 }
 440
 441 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
 442 {
 443     FORMATS_UNREF(ref, channel_layouts);
 444 }
 445
 446 #define FORMATS_CHANGEREF(oldref, newref)       \
 447 do {                                            \
 448     int idx = -1;                               \
 449                                                 \
 450     FIND_REF_INDEX(oldref, idx);                \
 451                                                 \
 452     if (idx >= 0) {                             \
 453         (*oldref)->refs[idx] = newref;          \
 454         *newref = *oldref;                      \
 455         *oldref = NULL;                         \
 456     }                                           \
 457 } while (0)
 458
 459 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
 460                                   AVFilterChannelLayouts **newref)
 461 {
 462     FORMATS_CHANGEREF(oldref, newref);
 463 }
 464
 465 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
 466 {
 467     FORMATS_CHANGEREF(oldref, newref);
 468 }
 469
 470 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
 471 {                                                                   \
 472     int count = 0, i;                                               \
 473                                                                     \
 474     for (i = 0; i < ctx->nb_inputs; i++) {                          \
 475         if (ctx->inputs[i] && !ctx->inputs[i]->out_fmts) {          \
 476             ref(fmts, &ctx->inputs[i]->out_fmts);                   \
 477             count++;                                                \
 478         }                                                           \
 479     }                                                               \
 480     for (i = 0; i < ctx->nb_outputs; i++) {                         \
 481         if (ctx->outputs[i] && !ctx->outputs[i]->in_fmts) {         \
 482             ref(fmts, &ctx->outputs[i]->in_fmts);                   \
 483             count++;                                                \
 484         }                                                           \
 485     }                                                               \
 486                                                                     \
 487     if (!count) {                                                   \
 488         av_freep(&fmts->list);                                      \
 489         av_freep(&fmts->refs);                                      \
 490         av_freep(&fmts);                                            \
 491     }                                                               \
 492 }
 493
 494 void ff_set_common_channel_layouts(AVFilterContext *ctx,
 495                                    AVFilterChannelLayouts *layouts)
 496 {
 497     SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
 498                        ff_channel_layouts_ref, channel_layouts);
 499 }
 500
 501 void ff_set_common_samplerates(AVFilterContext *ctx,
 502                                AVFilterFormats *samplerates)
 503 {
 504     SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
 505                        ff_formats_ref, formats);
 506 }
 507
 508 /**
 509  * A helper for query_formats() which sets all links to the same list of
 510  * formats. If there are no links hooked to this filter, the list of formats is
 511  * freed.
 512  */
 513 void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 514 {
 515     SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
 516                        ff_formats_ref, formats);
 517 }
 518
 519 static int default_query_formats_common(AVFilterContext *ctx,
 520                                         AVFilterChannelLayouts *(layouts)(void))
 521 {
 522     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 523                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 524                             AVMEDIA_TYPE_VIDEO;
 525
 526     ff_set_common_formats(ctx, ff_all_formats(type));
 527     if (type == AVMEDIA_TYPE_AUDIO) {
 528         ff_set_common_channel_layouts(ctx, layouts());
 529         ff_set_common_samplerates(ctx, ff_all_samplerates());
 530     }
 531
 532     return 0;
 533 }
 534
 535 int ff_default_query_formats(AVFilterContext *ctx)
 536 {
 537     return default_query_formats_common(ctx, ff_all_channel_layouts);
 538 }
 539
 540 int ff_query_formats_all(AVFilterContext *ctx)
 541 {
 542     return default_query_formats_common(ctx, ff_all_channel_counts);
 543 }
 544
 545 /* internal functions for parsing audio format arguments */
 546
 547 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
 548 {
 549     char *tail;
 550     int pix_fmt = av_get_pix_fmt(arg);
 551     if (pix_fmt == AV_PIX_FMT_NONE) {
 552         pix_fmt = strtol(arg, &tail, 0);
 553         if (*tail || (unsigned)pix_fmt >= AV_PIX_FMT_NB) {
 554             av_log(log_ctx, AV_LOG_ERROR, "Invalid pixel format '%s'\n", arg);
 555             return AVERROR(EINVAL);
 556         }
 557     }
 558     *ret = pix_fmt;
 559     return 0;
 560 }
 561
 562 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx)
 563 {
 564     char *tail;
 565     int sfmt = av_get_sample_fmt(arg);
 566     if (sfmt == AV_SAMPLE_FMT_NONE) {
 567         sfmt = strtol(arg, &tail, 0);
 568         if (*tail || (unsigned)sfmt >= AV_SAMPLE_FMT_NB) {
 569             av_log(log_ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);
 570             return AVERROR(EINVAL);
 571         }
 572     }
 573     *ret = sfmt;
 574     return 0;
 575 }
 576
 577 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx)
 578 {
 579     AVRational r;
 580     if(av_parse_ratio(&r, arg, INT_MAX, 0, log_ctx) < 0 ||r.num<=0  ||r.den<=0) {
 581         av_log(log_ctx, AV_LOG_ERROR, "Invalid time base '%s'\n", arg);
 582         return AVERROR(EINVAL);
 583     }
 584     *ret = r;
 585     return 0;
 586 }
 587
 588 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
 589 {
 590     char *tail;
 591     double srate = av_strtod(arg, &tail);
 592     if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
 593         av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
 594         return AVERROR(EINVAL);
 595     }
 596     *ret = srate;
 597     return 0;
 598 }
 599
 600 int ff_parse_channel_layout(int64_t *ret, const char *arg, void *log_ctx)
 601 {
 602     char *tail;
 603     int64_t chlayout = av_get_channel_layout(arg);
 604     if (chlayout == 0) {
 605         chlayout = strtol(arg, &tail, 10);
 606         if (*tail || chlayout == 0) {
 607             av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
 608             return AVERROR(EINVAL);
 609         }
 610     }
 611     *ret = chlayout;
 612     return 0;
 613 }
 614
 615 #ifdef TEST
 616
 617 #undef printf
 618
 619 int main(void)
 620 {
 621     const int64_t *cl;
 622     char buf[512];
 623
 624     for (cl = avfilter_all_channel_layouts; *cl != -1; cl++) {
 625         av_get_channel_layout_string(buf, sizeof(buf), -1, *cl);
 626         printf("%s\n", buf);
 627     }
 628
 629     return 0;
 630 }
 631
 632 #endif
 633