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 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/common.h"
  23 #include "libavutil/pixdesc.h"
  24 #include "avfilter.h"
  25 #include "internal.h"
  26 #include "formats.h"
  27
  28 /**
  29  * Add all refs from a to ret and destroy a.
  30  */
  31 #define MERGE_REF(ret, a, fmts, type, fail)                                \
  32 do {                                                                       \
  33     type ***tmp;                                                           \
  34     int i;                                                                 \
  35                                                                            \
  36     if (!(tmp = av_realloc(ret->refs,                                      \
  37                            sizeof(*tmp) * (ret->refcount + a->refcount)))) \
  38         goto fail;                                                         \
  39     ret->refs = tmp;                                                       \
  40                                                                            \
  41     for (i = 0; i < a->refcount; i ++) {                                   \
  42         ret->refs[ret->refcount] = a->refs[i];                             \
  43         *ret->refs[ret->refcount++] = ret;                                 \
  44     }                                                                      \
  45                                                                            \
  46     av_freep(&a->refs);                                                    \
  47     av_freep(&a->fmts);                                                    \
  48     av_freep(&a);                                                          \
  49 } while (0)
  50
  51 /**
  52  * Add all formats common for a and b to ret, copy the refs and destroy
  53  * a and b.
  54  */
  55 #define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail)                          \
  56 do {                                                                            \
  57     int i, j, k = 0, count = FFMIN(a->nb, b->nb);                               \
  58                                                                                 \
  59     if (!(ret = av_mallocz(sizeof(*ret))))                                      \
  60         goto fail;                                                              \
  61                                                                                 \
  62     if (count) {                                                                \
  63         if (!(ret->fmts = av_malloc(sizeof(*ret->fmts) * count)))               \
  64             goto fail;                                                          \
  65         for (i = 0; i < a->nb; i++)                                             \
  66             for (j = 0; j < b->nb; j++)                                         \
  67                 if (a->fmts[i] == b->fmts[j])                                   \
  68                     ret->fmts[k++] = a->fmts[i];                                \
  69                                                                                 \
  70         ret->nb = k;                                                            \
  71     }                                                                           \
  72     /* check that there was at least one common format */                       \
  73     if (!ret->nb)                                                               \
  74         goto fail;                                                              \
  75                                                                                 \
  76     MERGE_REF(ret, a, fmts, type, fail);                                        \
  77     MERGE_REF(ret, b, fmts, type, fail);                                        \
  78 } while (0)
  79
  80 AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
  81 {
  82     AVFilterFormats *ret = NULL;
  83
  84     if (a == b)
  85         return a;
  86
  87     MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
  88
  89     return ret;
  90 fail:
  91     if (ret) {
  92         av_freep(&ret->refs);
  93         av_freep(&ret->formats);
  94     }
  95     av_freep(&ret);
  96     return NULL;
  97 }
  98
  99 AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
 100                                       AVFilterFormats *b)
 101 {
 102     AVFilterFormats *ret = NULL;
 103
 104     if (a == b) return a;
 105
 106     if (a->nb_formats && b->nb_formats) {
 107         MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
 108     } else if (a->nb_formats) {
 109         MERGE_REF(a, b, formats, AVFilterFormats, fail);
 110         ret = a;
 111     } else {
 112         MERGE_REF(b, a, formats, AVFilterFormats, fail);
 113         ret = b;
 114     }
 115
 116     return ret;
 117 fail:
 118     if (ret) {
 119         av_freep(&ret->refs);
 120         av_freep(&ret->formats);
 121     }
 122     av_freep(&ret);
 123     return NULL;
 124 }
 125
 126 AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
 127                                                  AVFilterChannelLayouts *b)
 128 {
 129     AVFilterChannelLayouts *ret = NULL;
 130
 131     if (a == b) return a;
 132
 133     if (a->nb_channel_layouts && b->nb_channel_layouts) {
 134         MERGE_FORMATS(ret, a, b, channel_layouts, nb_channel_layouts,
 135                       AVFilterChannelLayouts, fail);
 136     } else if (a->nb_channel_layouts) {
 137         MERGE_REF(a, b, channel_layouts, AVFilterChannelLayouts, fail);
 138         ret = a;
 139     } else {
 140         MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
 141         ret = b;
 142     }
 143
 144     return ret;
 145 fail:
 146     if (ret) {
 147         av_freep(&ret->refs);
 148         av_freep(&ret->channel_layouts);
 149     }
 150     av_freep(&ret);
 151     return NULL;
 152 }
 153
 154 int ff_fmt_is_in(int fmt, const int *fmts)
 155 {
 156     const int *p;
 157
 158     for (p = fmts; *p != AV_PIX_FMT_NONE; p++) {
 159         if (fmt == *p)
 160             return 1;
 161     }
 162     return 0;
 163 }
 164
 165 AVFilterFormats *ff_make_format_list(const int *fmts)
 166 {
 167     AVFilterFormats *formats;
 168     int count;
 169
 170     for (count = 0; fmts[count] != -1; count++)
 171         ;
 172
 173     formats               = av_mallocz(sizeof(*formats));
 174     if (!formats)
 175         return NULL;
 176     if (count) {
 177         formats->formats  = av_malloc(sizeof(*formats->formats) * count);
 178         if (!formats->formats) {
 179             av_freep(&formats);
 180             return NULL;
 181         }
 182     }
 183     formats->nb_formats = count;
 184     memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
 185
 186     return formats;
 187 }
 188
 189 #define ADD_FORMAT(f, fmt, type, list, nb)                  \
 190 do {                                                        \
 191     type *fmts;                                             \
 192                                                             \
 193     if (!(*f) && !(*f = av_mallocz(sizeof(**f))))           \
 194         return AVERROR(ENOMEM);                             \
 195                                                             \
 196     fmts = av_realloc((*f)->list,                           \
 197                       sizeof(*(*f)->list) * ((*f)->nb + 1));\
 198     if (!fmts) {                                            \
 199         av_freep(&f);                                       \
 200         return AVERROR(ENOMEM);                             \
 201     }                                                       \
 202                                                             \
 203     (*f)->list = fmts;                                      \
 204     (*f)->list[(*f)->nb++] = fmt;                           \
 205     return 0;                                               \
 206 } while (0)
 207
 208 int ff_add_format(AVFilterFormats **avff, int fmt)
 209 {
 210     ADD_FORMAT(avff, fmt, int, formats, nb_formats);
 211 }
 212
 213 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
 214 {
 215     ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
 216 }
 217
 218 AVFilterFormats *ff_all_formats(enum AVMediaType type)
 219 {
 220     AVFilterFormats *ret = NULL;
 221
 222     if (type == AVMEDIA_TYPE_VIDEO) {
 223         const AVPixFmtDescriptor *desc = NULL;
 224         while ((desc = av_pix_fmt_desc_next(desc))) {
 225             ff_add_format(&ret, av_pix_fmt_desc_get_id(desc));
 226         }
 227     } else if (type == AVMEDIA_TYPE_AUDIO) {
 228         enum AVSampleFormat fmt = 0;
 229         while (av_get_sample_fmt_name(fmt)) {
 230             ff_add_format(&ret, fmt);
 231             fmt++;
 232         }
 233     }
 234
 235     return ret;
 236 }
 237
 238 AVFilterFormats *ff_planar_sample_fmts(void)
 239 {
 240     AVFilterFormats *ret = NULL;
 241     int fmt;
 242
 243     for (fmt = 0; fmt < AV_SAMPLE_FMT_NB; fmt++)
 244         if (av_sample_fmt_is_planar(fmt))
 245             ff_add_format(&ret, fmt);
 246
 247     return ret;
 248 }
 249
 250 AVFilterFormats *ff_all_samplerates(void)
 251 {
 252     AVFilterFormats *ret = av_mallocz(sizeof(*ret));
 253     return ret;
 254 }
 255
 256 AVFilterChannelLayouts *ff_all_channel_layouts(void)
 257 {
 258     AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
 259     return ret;
 260 }
 261
 262 #define FORMATS_REF(f, ref)                                          \
 263 do {                                                                 \
 264     *ref = f;                                                        \
 265     f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
 266     if (!f->refs)                                                    \
 267         return;                                                      \
 268     f->refs[f->refcount-1] = ref;                                    \
 269 } while (0)
 270
 271 void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
 272 {
 273     FORMATS_REF(f, ref);
 274 }
 275
 276 void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 277 {
 278     FORMATS_REF(f, ref);
 279 }
 280
 281 #define FIND_REF_INDEX(ref, idx)            \
 282 do {                                        \
 283     int i;                                  \
 284     for (i = 0; i < (*ref)->refcount; i ++) \
 285         if((*ref)->refs[i] == ref) {        \
 286             idx = i;                        \
 287             break;                          \
 288         }                                   \
 289 } while (0)
 290
 291 #define FORMATS_UNREF(ref, list)                                   \
 292 do {                                                               \
 293     int idx = -1;                                                  \
 294                                                                    \
 295     if (!*ref)                                                     \
 296         return;                                                    \
 297                                                                    \
 298     FIND_REF_INDEX(ref, idx);                                      \
 299                                                                    \
 300     if (idx >= 0)                                                  \
 301         memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,        \
 302             sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
 303                                                                    \
 304     if(!--(*ref)->refcount) {                                      \
 305         av_free((*ref)->list);                                     \
 306         av_free((*ref)->refs);                                     \
 307         av_free(*ref);                                             \
 308     }                                                              \
 309     *ref = NULL;                                                   \
 310 } while (0)
 311
 312 void ff_formats_unref(AVFilterFormats **ref)
 313 {
 314     FORMATS_UNREF(ref, formats);
 315 }
 316
 317 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
 318 {
 319     FORMATS_UNREF(ref, channel_layouts);
 320 }
 321
 322 #define FORMATS_CHANGEREF(oldref, newref)       \
 323 do {                                            \
 324     int idx = -1;                               \
 325                                                 \
 326     FIND_REF_INDEX(oldref, idx);                \
 327                                                 \
 328     if (idx >= 0) {                             \
 329         (*oldref)->refs[idx] = newref;          \
 330         *newref = *oldref;                      \
 331         *oldref = NULL;                         \
 332     }                                           \
 333 } while (0)
 334
 335 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
 336                                   AVFilterChannelLayouts **newref)
 337 {
 338     FORMATS_CHANGEREF(oldref, newref);
 339 }
 340
 341 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
 342 {
 343     FORMATS_CHANGEREF(oldref, newref);
 344 }
 345
 346 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
 347 {                                                                   \
 348     int count = 0, i;                                               \
 349                                                                     \
 350     for (i = 0; i < ctx->nb_inputs; i++) {                          \
 351         if (ctx->inputs[i]) {                                       \
 352             ref(fmts, &ctx->inputs[i]->out_fmts);                   \
 353             count++;                                                \
 354         }                                                           \
 355     }                                                               \
 356     for (i = 0; i < ctx->nb_outputs; i++) {                         \
 357         if (ctx->outputs[i]) {                                      \
 358             ref(fmts, &ctx->outputs[i]->in_fmts);                   \
 359             count++;                                                \
 360         }                                                           \
 361     }                                                               \
 362                                                                     \
 363     if (!count) {                                                   \
 364         av_freep(&fmts->list);                                      \
 365         av_freep(&fmts->refs);                                      \
 366         av_freep(&fmts);                                            \
 367     }                                                               \
 368 }
 369
 370 void ff_set_common_channel_layouts(AVFilterContext *ctx,
 371                                    AVFilterChannelLayouts *layouts)
 372 {
 373     SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
 374                        ff_channel_layouts_ref, channel_layouts);
 375 }
 376
 377 void ff_set_common_samplerates(AVFilterContext *ctx,
 378                                AVFilterFormats *samplerates)
 379 {
 380     SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
 381                        ff_formats_ref, formats);
 382 }
 383
 384 /**
 385  * A helper for query_formats() which sets all links to the same list of
 386  * formats. If there are no links hooked to this filter, the list of formats is
 387  * freed.
 388  */
 389 void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 390 {
 391     SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
 392                        ff_formats_ref, formats);
 393 }
 394
 395 int ff_default_query_formats(AVFilterContext *ctx)
 396 {
 397     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 398                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 399                             AVMEDIA_TYPE_VIDEO;
 400
 401     ff_set_common_formats(ctx, ff_all_formats(type));
 402     if (type == AVMEDIA_TYPE_AUDIO) {
 403         ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
 404         ff_set_common_samplerates(ctx, ff_all_samplerates());
 405     }
 406
 407     return 0;
 408 }