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_array(ret->refs, ret->refcount + a->refcount,   \
  43                                  sizeof(*tmp))))                           \
  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_array(count, sizeof(*ret->fmts))))          \
  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 %s detected\n", __FUNCTION__); \
  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                                   enum AVMediaType type)
  94 {
  95     AVFilterFormats *ret = NULL;
  96     int i, j;
  97     int alpha1=0, alpha2=0;
  98     int chroma1=0, chroma2=0;
  99
 100     if (a == b)
 101         return a;
 102
 103     /* Do not lose chroma or alpha in merging.
 104        It happens if both lists have formats with chroma (resp. alpha), but
 105        the only formats in common do not have it (e.g. YUV+gray vs.
 106        RGB+gray): in that case, the merging would select the gray format,
 107        possibly causing a lossy conversion elsewhere in the graph.
 108        To avoid that, pretend that there are no common formats to force the
 109        insertion of a conversion filter. */
 110     if (type == AVMEDIA_TYPE_VIDEO)
 111         for (i = 0; i < a->nb_formats; i++)
 112             for (j = 0; j < b->nb_formats; j++) {
 113                 const AVPixFmtDescriptor *adesc = av_pix_fmt_desc_get(a->formats[i]);
 114                 const AVPixFmtDescriptor *bdesc = av_pix_fmt_desc_get(b->formats[j]);
 115                 alpha2 |= adesc->flags & bdesc->flags & AV_PIX_FMT_FLAG_ALPHA;
 116                 chroma2|= adesc->nb_components > 1 && bdesc->nb_components > 1;
 117                 if (a->formats[i] == b->formats[j]) {
 118                     alpha1 |= adesc->flags & AV_PIX_FMT_FLAG_ALPHA;
 119                     chroma1|= adesc->nb_components > 1;
 120                 }
 121             }
 122
 123     // If chroma or alpha can be lost through merging then do not merge
 124     if (alpha2 > alpha1 || chroma2 > chroma1)
 125         return NULL;
 126
 127     MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
 128
 129     return ret;
 130 fail:
 131     if (ret) {
 132         av_freep(&ret->refs);
 133         av_freep(&ret->formats);
 134     }
 135     av_freep(&ret);
 136     return NULL;
 137 }
 138
 139 AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
 140                                       AVFilterFormats *b)
 141 {
 142     AVFilterFormats *ret = NULL;
 143
 144     if (a == b) return a;
 145
 146     if (a->nb_formats && b->nb_formats) {
 147         MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
 148     } else if (a->nb_formats) {
 149         MERGE_REF(a, b, formats, AVFilterFormats, fail);
 150         ret = a;
 151     } else {
 152         MERGE_REF(b, a, formats, AVFilterFormats, fail);
 153         ret = b;
 154     }
 155
 156     return ret;
 157 fail:
 158     if (ret) {
 159         av_freep(&ret->refs);
 160         av_freep(&ret->formats);
 161     }
 162     av_freep(&ret);
 163     return NULL;
 164 }
 165
 166 AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
 167                                                  AVFilterChannelLayouts *b)
 168 {
 169     AVFilterChannelLayouts *ret = NULL;
 170     unsigned a_all = a->all_layouts + a->all_counts;
 171     unsigned b_all = b->all_layouts + b->all_counts;
 172     int ret_max, ret_nb = 0, i, j, round;
 173
 174     if (a == b) return a;
 175
 176     /* Put the most generic set in a, to avoid doing everything twice */
 177     if (a_all < b_all) {
 178         FFSWAP(AVFilterChannelLayouts *, a, b);
 179         FFSWAP(unsigned, a_all, b_all);
 180     }
 181     if (a_all) {
 182         if (a_all == 1 && !b_all) {
 183             /* keep only known layouts in b; works also for b_all = 1 */
 184             for (i = j = 0; i < b->nb_channel_layouts; i++)
 185                 if (KNOWN(b->channel_layouts[i]))
 186                     b->channel_layouts[j++] = b->channel_layouts[i];
 187             /* Not optimal: the unknown layouts of b may become known after
 188                another merge. */
 189             if (!j)
 190                 return NULL;
 191             b->nb_channel_layouts = j;
 192         }
 193         MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
 194         return b;
 195     }
 196
 197     ret_max = a->nb_channel_layouts + b->nb_channel_layouts;
 198     if (!(ret = av_mallocz(sizeof(*ret))) ||
 199         !(ret->channel_layouts = av_malloc_array(ret_max,
 200                                                  sizeof(*ret->channel_layouts))))
 201         goto fail;
 202
 203     /* a[known] intersect b[known] */
 204     for (i = 0; i < a->nb_channel_layouts; i++) {
 205         if (!KNOWN(a->channel_layouts[i]))
 206             continue;
 207         for (j = 0; j < b->nb_channel_layouts; j++) {
 208             if (a->channel_layouts[i] == b->channel_layouts[j]) {
 209                 ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
 210                 a->channel_layouts[i] = b->channel_layouts[j] = 0;
 211             }
 212         }
 213     }
 214     /* 1st round: a[known] intersect b[generic]
 215        2nd round: a[generic] intersect b[known] */
 216     for (round = 0; round < 2; round++) {
 217         for (i = 0; i < a->nb_channel_layouts; i++) {
 218             uint64_t fmt = a->channel_layouts[i], bfmt;
 219             if (!fmt || !KNOWN(fmt))
 220                 continue;
 221             bfmt = FF_COUNT2LAYOUT(av_get_channel_layout_nb_channels(fmt));
 222             for (j = 0; j < b->nb_channel_layouts; j++)
 223                 if (b->channel_layouts[j] == bfmt)
 224                     ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
 225         }
 226         /* 1st round: swap to prepare 2nd round; 2nd round: put it back */
 227         FFSWAP(AVFilterChannelLayouts *, a, b);
 228     }
 229     /* a[generic] intersect b[generic] */
 230     for (i = 0; i < a->nb_channel_layouts; i++) {
 231         if (KNOWN(a->channel_layouts[i]))
 232             continue;
 233         for (j = 0; j < b->nb_channel_layouts; j++)
 234             if (a->channel_layouts[i] == b->channel_layouts[j])
 235                 ret->channel_layouts[ret_nb++] = a->channel_layouts[i];
 236     }
 237
 238     ret->nb_channel_layouts = ret_nb;
 239     if (!ret->nb_channel_layouts)
 240         goto fail;
 241     MERGE_REF(ret, a, channel_layouts, AVFilterChannelLayouts, fail);
 242     MERGE_REF(ret, b, channel_layouts, AVFilterChannelLayouts, fail);
 243     return ret;
 244
 245 fail:
 246     if (ret) {
 247         av_freep(&ret->refs);
 248         av_freep(&ret->channel_layouts);
 249     }
 250     av_freep(&ret);
 251     return NULL;
 252 }
 253
 254 int ff_fmt_is_in(int fmt, const int *fmts)
 255 {
 256     const int *p;
 257
 258     for (p = fmts; *p != -1; p++) {
 259         if (fmt == *p)
 260             return 1;
 261     }
 262     return 0;
 263 }
 264
 265 #define MAKE_FORMAT_LIST(type, field, count_field)                      \
 266     type *formats;                                                      \
 267     int count = 0;                                                      \
 268     if (fmts)                                                           \
 269         for (count = 0; fmts[count] != -1; count++)                     \
 270             ;                                                           \
 271     formats = av_mallocz(sizeof(*formats));                             \
 272     if (!formats)                                                       \
 273         return NULL;                                                    \
 274     formats->count_field = count;                                       \
 275     if (count) {                                                        \
 276         formats->field = av_malloc_array(count, sizeof(*formats->field));      \
 277         if (!formats->field) {                                          \
 278             av_freep(&formats);                                         \
 279             return NULL;                                                \
 280         }                                                               \
 281     }
 282
 283 AVFilterFormats *ff_make_format_list(const int *fmts)
 284 {
 285     MAKE_FORMAT_LIST(AVFilterFormats, formats, nb_formats);
 286     while (count--)
 287         formats->formats[count] = fmts[count];
 288
 289     return formats;
 290 }
 291
 292 AVFilterChannelLayouts *ff_make_formatu64_list(const uint64_t *fmts)
 293 {
 294     MAKE_FORMAT_LIST(AVFilterChannelLayouts,
 295                      channel_layouts, nb_channel_layouts);
 296     if (count)
 297         memcpy(formats->channel_layouts, fmts,
 298                sizeof(*formats->channel_layouts) * count);
 299
 300     return formats;
 301 }
 302
 303 AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts)
 304 {
 305     MAKE_FORMAT_LIST(AVFilterChannelLayouts,
 306                      channel_layouts, nb_channel_layouts);
 307     if (count)
 308         memcpy(formats->channel_layouts, fmts,
 309                sizeof(*formats->channel_layouts) * count);
 310
 311     return formats;
 312 }
 313
 314 #define ADD_FORMAT(f, fmt, unref_fn, type, list, nb)        \
 315 do {                                                        \
 316     type *fmts;                                             \
 317     void *oldf = *f;                                        \
 318                                                             \
 319     if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) {         \
 320         return AVERROR(ENOMEM);                             \
 321     }                                                       \
 322                                                             \
 323     fmts = av_realloc_array((*f)->list, (*f)->nb + 1,       \
 324                             sizeof(*(*f)->list));           \
 325     if (!fmts) {                                            \
 326         unref_fn(f);                                        \
 327         if (!oldf)                                          \
 328             av_freep(f);                                    \
 329         return AVERROR(ENOMEM);                             \
 330     }                                                       \
 331                                                             \
 332     (*f)->list = fmts;                                      \
 333     (*f)->list[(*f)->nb++] = fmt;                           \
 334 } while (0)
 335
 336 int ff_add_format(AVFilterFormats **avff, int64_t fmt)
 337 {
 338     ADD_FORMAT(avff, fmt, ff_formats_unref, int, formats, nb_formats);
 339     return 0;
 340 }
 341
 342 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
 343 {
 344     av_assert1(!(*l && (*l)->all_layouts));
 345     ADD_FORMAT(l, channel_layout, ff_channel_layouts_unref, uint64_t, channel_layouts, nb_channel_layouts);
 346     return 0;
 347 }
 348
 349 AVFilterFormats *ff_all_formats(enum AVMediaType type)
 350 {
 351     AVFilterFormats *ret = NULL;
 352
 353     if (type == AVMEDIA_TYPE_VIDEO) {
 354         const AVPixFmtDescriptor *desc = NULL;
 355         while ((desc = av_pix_fmt_desc_next(desc))) {
 356             if (ff_add_format(&ret, av_pix_fmt_desc_get_id(desc)) < 0)
 357                 return NULL;
 358         }
 359     } else if (type == AVMEDIA_TYPE_AUDIO) {
 360         enum AVSampleFormat fmt = 0;
 361         while (av_get_sample_fmt_name(fmt)) {
 362             if (ff_add_format(&ret, fmt) < 0)
 363                 return NULL;
 364             fmt++;
 365         }
 366     }
 367
 368     return ret;
 369 }
 370
 371 int ff_formats_pixdesc_filter(AVFilterFormats **rfmts, unsigned want, unsigned rej)
 372 {
 373     unsigned nb_formats, fmt, flags;
 374     AVFilterFormats *formats = NULL;
 375
 376     while (1) {
 377         nb_formats = 0;
 378         for (fmt = 0;; fmt++) {
 379             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
 380             if (!desc)
 381                 break;
 382             flags = desc->flags;
 383             if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL) &&
 384                 !(desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
 385                 (desc->log2_chroma_w || desc->log2_chroma_h))
 386                 flags |= FF_PIX_FMT_FLAG_SW_FLAT_SUB;
 387             if ((flags & (want | rej)) != want)
 388                 continue;
 389             if (formats)
 390                 formats->formats[nb_formats] = fmt;
 391             nb_formats++;
 392         }
 393         if (formats) {
 394             av_assert0(formats->nb_formats == nb_formats);
 395             *rfmts = formats;
 396             return 0;
 397         }
 398         formats = av_mallocz(sizeof(*formats));
 399         if (!formats)
 400             return AVERROR(ENOMEM);
 401         formats->nb_formats = nb_formats;
 402         if (nb_formats) {
 403             formats->formats = av_malloc_array(nb_formats, sizeof(*formats->formats));
 404             if (!formats->formats) {
 405                 av_freep(&formats);
 406                 return AVERROR(ENOMEM);
 407             }
 408         }
 409     }
 410 }
 411
 412 AVFilterFormats *ff_planar_sample_fmts(void)
 413 {
 414     AVFilterFormats *ret = NULL;
 415     int fmt;
 416
 417     for (fmt = 0; av_get_bytes_per_sample(fmt)>0; fmt++)
 418         if (av_sample_fmt_is_planar(fmt))
 419             if (ff_add_format(&ret, fmt) < 0)
 420                 return NULL;
 421
 422     return ret;
 423 }
 424
 425 AVFilterFormats *ff_all_samplerates(void)
 426 {
 427     AVFilterFormats *ret = av_mallocz(sizeof(*ret));
 428     return ret;
 429 }
 430
 431 AVFilterChannelLayouts *ff_all_channel_layouts(void)
 432 {
 433     AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
 434     if (!ret)
 435         return NULL;
 436     ret->all_layouts = 1;
 437     return ret;
 438 }
 439
 440 AVFilterChannelLayouts *ff_all_channel_counts(void)
 441 {
 442     AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
 443     if (!ret)
 444         return NULL;
 445     ret->all_layouts = ret->all_counts = 1;
 446     return ret;
 447 }
 448
 449 #define FORMATS_REF(f, ref, unref_fn)                                           \
 450     void *tmp;                                                                  \
 451                                                                                 \
 452     if (!f || !ref)                                                             \
 453         return AVERROR(ENOMEM);                                                 \
 454                                                                                 \
 455     tmp = av_realloc_array(f->refs, sizeof(*f->refs), f->refcount + 1);         \
 456     if (!tmp) {                                                                 \
 457         unref_fn(&f);                                                           \
 458         return AVERROR(ENOMEM);                                                 \
 459     }                                                                           \
 460     f->refs = tmp;                                                              \
 461     f->refs[f->refcount++] = ref;                                               \
 462     *ref = f;                                                                   \
 463     return 0
 464
 465 int ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
 466 {
 467     FORMATS_REF(f, ref, ff_channel_layouts_unref);
 468 }
 469
 470 int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 471 {
 472     FORMATS_REF(f, ref, ff_formats_unref);
 473 }
 474
 475 #define FIND_REF_INDEX(ref, idx)            \
 476 do {                                        \
 477     int i;                                  \
 478     for (i = 0; i < (*ref)->refcount; i ++) \
 479         if((*ref)->refs[i] == ref) {        \
 480             idx = i;                        \
 481             break;                          \
 482         }                                   \
 483 } while (0)
 484
 485 #define FORMATS_UNREF(ref, list)                                   \
 486 do {                                                               \
 487     int idx = -1;                                                  \
 488                                                                    \
 489     if (!ref || !*ref || !(*ref)->refs)                            \
 490         return;                                                    \
 491                                                                    \
 492     FIND_REF_INDEX(ref, idx);                                      \
 493                                                                    \
 494     if (idx >= 0)                                                  \
 495         memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,        \
 496             sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
 497                                                                    \
 498     if(!--(*ref)->refcount) {                                      \
 499         av_free((*ref)->list);                                     \
 500         av_free((*ref)->refs);                                     \
 501         av_free(*ref);                                             \
 502     }                                                              \
 503     *ref = NULL;                                                   \
 504 } while (0)
 505
 506 void ff_formats_unref(AVFilterFormats **ref)
 507 {
 508     FORMATS_UNREF(ref, formats);
 509 }
 510
 511 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
 512 {
 513     FORMATS_UNREF(ref, channel_layouts);
 514 }
 515
 516 #define FORMATS_CHANGEREF(oldref, newref)       \
 517 do {                                            \
 518     int idx = -1;                               \
 519                                                 \
 520     FIND_REF_INDEX(oldref, idx);                \
 521                                                 \
 522     if (idx >= 0) {                             \
 523         (*oldref)->refs[idx] = newref;          \
 524         *newref = *oldref;                      \
 525         *oldref = NULL;                         \
 526     }                                           \
 527 } while (0)
 528
 529 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
 530                                   AVFilterChannelLayouts **newref)
 531 {
 532     FORMATS_CHANGEREF(oldref, newref);
 533 }
 534
 535 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
 536 {
 537     FORMATS_CHANGEREF(oldref, newref);
 538 }
 539
 540 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref_fn, unref_fn, list) \
 541     int count = 0, i;                                               \
 542                                                                     \
 543     if (!fmts)                                                      \
 544         return AVERROR(ENOMEM);                                     \
 545                                                                     \
 546     for (i = 0; i < ctx->nb_inputs; i++) {                          \
 547         if (ctx->inputs[i] && !ctx->inputs[i]->out_fmts) {          \
 548             int ret = ref_fn(fmts, &ctx->inputs[i]->out_fmts);      \
 549             if (ret < 0) {                                          \
 550                 unref_fn(&fmts);                                    \
 551                 if (fmts)                                           \
 552                     av_freep(&fmts->list);                          \
 553                 av_freep(&fmts);                                    \
 554                 return ret;                                         \
 555             }                                                       \
 556             count++;                                                \
 557         }                                                           \
 558     }                                                               \
 559     for (i = 0; i < ctx->nb_outputs; i++) {                         \
 560         if (ctx->outputs[i] && !ctx->outputs[i]->in_fmts) {         \
 561             int ret = ref_fn(fmts, &ctx->outputs[i]->in_fmts);      \
 562             if (ret < 0) {                                          \
 563                 unref_fn(&fmts);                                    \
 564                 if (fmts)                                           \
 565                     av_freep(&fmts->list);                          \
 566                 av_freep(&fmts);                                    \
 567                 return ret;                                         \
 568             }                                                       \
 569             count++;                                                \
 570         }                                                           \
 571     }                                                               \
 572                                                                     \
 573     if (!count) {                                                   \
 574         av_freep(&fmts->list);                                      \
 575         av_freep(&fmts->refs);                                      \
 576         av_freep(&fmts);                                            \
 577     }                                                               \
 578                                                                     \
 579     return 0;
 580
 581 int ff_set_common_channel_layouts(AVFilterContext *ctx,
 582                                   AVFilterChannelLayouts *layouts)
 583 {
 584     SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
 585                        ff_channel_layouts_ref, ff_channel_layouts_unref, channel_layouts);
 586 }
 587
 588 int ff_set_common_samplerates(AVFilterContext *ctx,
 589                               AVFilterFormats *samplerates)
 590 {
 591     SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
 592                        ff_formats_ref, ff_formats_unref, formats);
 593 }
 594
 595 /**
 596  * A helper for query_formats() which sets all links to the same list of
 597  * formats. If there are no links hooked to this filter, the list of formats is
 598  * freed.
 599  */
 600 int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 601 {
 602     SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
 603                        ff_formats_ref, ff_formats_unref, formats);
 604 }
 605
 606 static int default_query_formats_common(AVFilterContext *ctx,
 607                                         AVFilterChannelLayouts *(layouts)(void))
 608 {
 609     int ret;
 610     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 611                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 612                             AVMEDIA_TYPE_VIDEO;
 613
 614     ret = ff_set_common_formats(ctx, ff_all_formats(type));
 615     if (ret < 0)
 616         return ret;
 617     if (type == AVMEDIA_TYPE_AUDIO) {
 618         ret = ff_set_common_channel_layouts(ctx, layouts());
 619         if (ret < 0)
 620             return ret;
 621         ret = ff_set_common_samplerates(ctx, ff_all_samplerates());
 622         if (ret < 0)
 623             return ret;
 624     }
 625
 626     return 0;
 627 }
 628
 629 int ff_default_query_formats(AVFilterContext *ctx)
 630 {
 631     return default_query_formats_common(ctx, ff_all_channel_counts);
 632 }
 633
 634 int ff_query_formats_all_layouts(AVFilterContext *ctx)
 635 {
 636     return default_query_formats_common(ctx, ff_all_channel_layouts);
 637 }
 638
 639 /* internal functions for parsing audio format arguments */
 640
 641 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)
 642 {
 643     char *tail;
 644     int pix_fmt = av_get_pix_fmt(arg);
 645     if (pix_fmt == AV_PIX_FMT_NONE) {
 646         pix_fmt = strtol(arg, &tail, 0);
 647         if (*tail || !av_pix_fmt_desc_get(pix_fmt)) {
 648             av_log(log_ctx, AV_LOG_ERROR, "Invalid pixel format '%s'\n", arg);
 649             return AVERROR(EINVAL);
 650         }
 651     }
 652     *ret = pix_fmt;
 653     return 0;
 654 }
 655
 656 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx)
 657 {
 658     char *tail;
 659     int sfmt = av_get_sample_fmt(arg);
 660     if (sfmt == AV_SAMPLE_FMT_NONE) {
 661         sfmt = strtol(arg, &tail, 0);
 662         if (*tail || av_get_bytes_per_sample(sfmt)<=0) {
 663             av_log(log_ctx, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);
 664             return AVERROR(EINVAL);
 665         }
 666     }
 667     *ret = sfmt;
 668     return 0;
 669 }
 670
 671 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx)
 672 {
 673     AVRational r;
 674     if(av_parse_ratio(&r, arg, INT_MAX, 0, log_ctx) < 0 ||r.num<=0  ||r.den<=0) {
 675         av_log(log_ctx, AV_LOG_ERROR, "Invalid time base '%s'\n", arg);
 676         return AVERROR(EINVAL);
 677     }
 678     *ret = r;
 679     return 0;
 680 }
 681
 682 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
 683 {
 684     char *tail;
 685     double srate = av_strtod(arg, &tail);
 686     if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
 687         av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
 688         return AVERROR(EINVAL);
 689     }
 690     *ret = srate;
 691     return 0;
 692 }
 693
 694 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
 695                             void *log_ctx)
 696 {
 697     int64_t chlayout;
 698     int nb_channels;
 699
 700     if (av_get_extended_channel_layout(arg, &chlayout, &nb_channels) < 0) {
 701         av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
 702         return AVERROR(EINVAL);
 703     }
 704     if (!chlayout && !nret) {
 705         av_log(log_ctx, AV_LOG_ERROR, "Unknown channel layout '%s' is not supported.\n", arg);
 706         return AVERROR(EINVAL);
 707     }
 708     *ret = chlayout;
 709     if (nret)
 710         *nret = nb_channels;
 711
 712     return 0;
 713 }