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/pixdesc.h"
  23 #include "avfilter.h"
  24 #include "internal.h"
  25 #include "formats.h"
  26
  27 /**
  28  * Add all refs from a to ret and destroy a.
  29  */
  30 #define MERGE_REF(ret, a, fmts, type, fail)                                \
  31 do {                                                                       \
  32     type ***tmp;                                                           \
  33     int i;                                                                 \
  34                                                                            \
  35     if (!(tmp = av_realloc(ret->refs,                                      \
  36                            sizeof(*tmp) * (ret->refcount + a->refcount)))) \
  37         goto fail;                                                         \
  38     ret->refs = tmp;                                                       \
  39                                                                            \
  40     for (i = 0; i < a->refcount; i ++) {                                   \
  41         ret->refs[ret->refcount] = a->refs[i];                             \
  42         *ret->refs[ret->refcount++] = ret;                                 \
  43     }                                                                      \
  44                                                                            \
  45     av_freep(&a->refs);                                                    \
  46     av_freep(&a->fmts);                                                    \
  47     av_freep(&a);                                                          \
  48 } while (0)
  49
  50 /**
  51  * Add all formats common for a and b to ret, copy the refs and destroy
  52  * a and b.
  53  */
  54 #define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail)                          \
  55 do {                                                                            \
  56     int i, j, k = 0, count = FFMIN(a->nb, b->nb);                               \
  57                                                                                 \
  58     if (!(ret = av_mallocz(sizeof(*ret))))                                      \
  59         goto fail;                                                              \
  60                                                                                 \
  61     if (count) {                                                                \
  62         if (!(ret->fmts = av_malloc(sizeof(*ret->fmts) * count)))               \
  63             goto fail;                                                          \
  64         for (i = 0; i < a->nb; i++)                                             \
  65             for (j = 0; j < b->nb; j++)                                         \
  66                 if (a->fmts[i] == b->fmts[j])                                   \
  67                     ret->fmts[k++] = a->fmts[i];                                \
  68                                                                                 \
  69         ret->nb = k;                                                            \
  70     }                                                                           \
  71     /* check that there was at least one common format */                       \
  72     if (!ret->nb)                                                               \
  73         goto fail;                                                              \
  74                                                                                 \
  75     MERGE_REF(ret, a, fmts, type, fail);                                        \
  76     MERGE_REF(ret, b, fmts, type, fail);                                        \
  77 } while (0)
  78
  79 AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
  80 {
  81     AVFilterFormats *ret = NULL;
  82
  83     if (a == b)
  84         return a;
  85
  86     MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
  87
  88     return ret;
  89 fail:
  90     if (ret) {
  91         av_freep(&ret->refs);
  92         av_freep(&ret->formats);
  93     }
  94     av_freep(&ret);
  95     return NULL;
  96 }
  97
  98 AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
  99                                       AVFilterFormats *b)
 100 {
 101     AVFilterFormats *ret = NULL;
 102
 103     if (a == b) return a;
 104
 105     if (a->format_count && b->format_count) {
 106         MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
 107     } else if (a->format_count) {
 108         MERGE_REF(a, b, formats, AVFilterFormats, fail);
 109         ret = a;
 110     } else {
 111         MERGE_REF(b, a, formats, AVFilterFormats, fail);
 112         ret = b;
 113     }
 114
 115     return ret;
 116 fail:
 117     if (ret) {
 118         av_freep(&ret->refs);
 119         av_freep(&ret->formats);
 120     }
 121     av_freep(&ret);
 122     return NULL;
 123 }
 124
 125 AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
 126                                                  AVFilterChannelLayouts *b)
 127 {
 128     AVFilterChannelLayouts *ret = NULL;
 129
 130     if (a == b) return a;
 131
 132     if (a->nb_channel_layouts && b->nb_channel_layouts) {
 133         MERGE_FORMATS(ret, a, b, channel_layouts, nb_channel_layouts,
 134                       AVFilterChannelLayouts, fail);
 135     } else if (a->nb_channel_layouts) {
 136         MERGE_REF(a, b, channel_layouts, AVFilterChannelLayouts, fail);
 137         ret = a;
 138     } else {
 139         MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
 140         ret = b;
 141     }
 142
 143     return ret;
 144 fail:
 145     if (ret) {
 146         av_freep(&ret->refs);
 147         av_freep(&ret->channel_layouts);
 148     }
 149     av_freep(&ret);
 150     return NULL;
 151 }
 152
 153 int ff_fmt_is_in(int fmt, const int *fmts)
 154 {
 155     const int *p;
 156
 157     for (p = fmts; *p != PIX_FMT_NONE; p++) {
 158         if (fmt == *p)
 159             return 1;
 160     }
 161     return 0;
 162 }
 163
 164 AVFilterFormats *ff_make_format_list(const int *fmts)
 165 {
 166     AVFilterFormats *formats;
 167     int count;
 168
 169     for (count = 0; fmts[count] != -1; count++)
 170         ;
 171
 172     formats               = av_mallocz(sizeof(*formats));
 173     if (count)
 174         formats->formats  = av_malloc(sizeof(*formats->formats) * count);
 175     formats->format_count = count;
 176     memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
 177
 178     return formats;
 179 }
 180
 181 #define ADD_FORMAT(f, fmt, type, list, nb)                  \
 182 do {                                                        \
 183     type *fmts;                                             \
 184                                                             \
 185     if (!(*f) && !(*f = av_mallocz(sizeof(**f))))           \
 186         return AVERROR(ENOMEM);                             \
 187                                                             \
 188     fmts = av_realloc((*f)->list,                           \
 189                       sizeof(*(*f)->list) * ((*f)->nb + 1));\
 190     if (!fmts)                                              \
 191         return AVERROR(ENOMEM);                             \
 192                                                             \
 193     (*f)->list = fmts;                                      \
 194     (*f)->list[(*f)->nb++] = fmt;                           \
 195     return 0;                                               \
 196 } while (0)
 197
 198 int ff_add_format(AVFilterFormats **avff, int fmt)
 199 {
 200     ADD_FORMAT(avff, fmt, int, formats, format_count);
 201 }
 202
 203 int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
 204 {
 205     ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
 206 }
 207
 208 AVFilterFormats *ff_all_formats(enum AVMediaType type)
 209 {
 210     AVFilterFormats *ret = NULL;
 211     int fmt;
 212     int num_formats = type == AVMEDIA_TYPE_VIDEO ? PIX_FMT_NB    :
 213                       type == AVMEDIA_TYPE_AUDIO ? AV_SAMPLE_FMT_NB : 0;
 214
 215     for (fmt = 0; fmt < num_formats; fmt++)
 216         if ((type != AVMEDIA_TYPE_VIDEO) ||
 217             (type == AVMEDIA_TYPE_VIDEO && !(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_HWACCEL)))
 218             ff_add_format(&ret, fmt);
 219
 220     return ret;
 221 }
 222
 223 AVFilterFormats *ff_planar_sample_fmts(void)
 224 {
 225     AVFilterFormats *ret = NULL;
 226     int fmt;
 227
 228     for (fmt = 0; fmt < AV_SAMPLE_FMT_NB; fmt++)
 229         if (av_sample_fmt_is_planar(fmt))
 230             ff_add_format(&ret, fmt);
 231
 232     return ret;
 233 }
 234
 235 AVFilterFormats *ff_all_samplerates(void)
 236 {
 237     AVFilterFormats *ret = av_mallocz(sizeof(*ret));
 238     return ret;
 239 }
 240
 241 AVFilterChannelLayouts *ff_all_channel_layouts(void)
 242 {
 243     AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
 244     return ret;
 245 }
 246
 247 #define FORMATS_REF(f, ref)                                          \
 248 do {                                                                 \
 249     *ref = f;                                                        \
 250     f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
 251     f->refs[f->refcount-1] = ref;                                    \
 252 } while (0)
 253
 254 void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
 255 {
 256     FORMATS_REF(f, ref);
 257 }
 258
 259 void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 260 {
 261     FORMATS_REF(f, ref);
 262 }
 263
 264 #define FIND_REF_INDEX(ref, idx)            \
 265 do {                                        \
 266     int i;                                  \
 267     for (i = 0; i < (*ref)->refcount; i ++) \
 268         if((*ref)->refs[i] == ref) {        \
 269             idx = i;                        \
 270             break;                          \
 271         }                                   \
 272 } while (0)
 273
 274 #define FORMATS_UNREF(ref, list)                                   \
 275 do {                                                               \
 276     int idx = -1;                                                  \
 277                                                                    \
 278     if (!*ref)                                                     \
 279         return;                                                    \
 280                                                                    \
 281     FIND_REF_INDEX(ref, idx);                                      \
 282                                                                    \
 283     if (idx >= 0)                                                  \
 284         memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,        \
 285             sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
 286                                                                    \
 287     if(!--(*ref)->refcount) {                                      \
 288         av_free((*ref)->list);                                     \
 289         av_free((*ref)->refs);                                     \
 290         av_free(*ref);                                             \
 291     }                                                              \
 292     *ref = NULL;                                                   \
 293 } while (0)
 294
 295 void ff_formats_unref(AVFilterFormats **ref)
 296 {
 297     FORMATS_UNREF(ref, formats);
 298 }
 299
 300 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
 301 {
 302     FORMATS_UNREF(ref, channel_layouts);
 303 }
 304
 305 #define FORMATS_CHANGEREF(oldref, newref)       \
 306 do {                                            \
 307     int idx = -1;                               \
 308                                                 \
 309     FIND_REF_INDEX(oldref, idx);                \
 310                                                 \
 311     if (idx >= 0) {                             \
 312         (*oldref)->refs[idx] = newref;          \
 313         *newref = *oldref;                      \
 314         *oldref = NULL;                         \
 315     }                                           \
 316 } while (0)
 317
 318 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
 319                                   AVFilterChannelLayouts **newref)
 320 {
 321     FORMATS_CHANGEREF(oldref, newref);
 322 }
 323
 324 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
 325 {
 326     FORMATS_CHANGEREF(oldref, newref);
 327 }
 328
 329 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
 330 {                                                                   \
 331     int count = 0, i;                                               \
 332                                                                     \
 333     for (i = 0; i < ctx->input_count; i++) {                        \
 334         if (ctx->inputs[i]) {                                       \
 335             ref(fmts, &ctx->inputs[i]->out_fmts);                   \
 336             count++;                                                \
 337         }                                                           \
 338     }                                                               \
 339     for (i = 0; i < ctx->output_count; i++) {                       \
 340         if (ctx->outputs[i]) {                                      \
 341             ref(fmts, &ctx->outputs[i]->in_fmts);                   \
 342             count++;                                                \
 343         }                                                           \
 344     }                                                               \
 345                                                                     \
 346     if (!count) {                                                   \
 347         av_freep(&fmts->list);                                      \
 348         av_freep(&fmts->refs);                                      \
 349         av_freep(&fmts);                                            \
 350     }                                                               \
 351 }
 352
 353 void ff_set_common_channel_layouts(AVFilterContext *ctx,
 354                                    AVFilterChannelLayouts *layouts)
 355 {
 356     SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
 357                        ff_channel_layouts_ref, channel_layouts);
 358 }
 359
 360 void ff_set_common_samplerates(AVFilterContext *ctx,
 361                                AVFilterFormats *samplerates)
 362 {
 363     SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
 364                        ff_formats_ref, formats);
 365 }
 366
 367 /**
 368  * A helper for query_formats() which sets all links to the same list of
 369  * formats. If there are no links hooked to this filter, the list of formats is
 370  * freed.
 371  */
 372 void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 373 {
 374     SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
 375                        ff_formats_ref, formats);
 376 }
 377
 378 int ff_default_query_formats(AVFilterContext *ctx)
 379 {
 380     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 381                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 382                             AVMEDIA_TYPE_VIDEO;
 383
 384     ff_set_common_formats(ctx, ff_all_formats(type));
 385     if (type == AVMEDIA_TYPE_AUDIO) {
 386         ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
 387         ff_set_common_samplerates(ctx, ff_all_samplerates());
 388     }
 389
 390     return 0;
 391 }
 392
 393 #if FF_API_FILTERS_PUBLIC
 394 int avfilter_default_query_formats(AVFilterContext *ctx)
 395 {
 396     return ff_default_query_formats(ctx);
 397 }
 398 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 399 {
 400     ff_set_common_formats(ctx, formats);
 401 }
 402 AVFilterFormats *avfilter_make_format_list(const int *fmts)
 403 {
 404     return ff_make_format_list(fmts);
 405 }
 406 int avfilter_add_format(AVFilterFormats **avff, int fmt)
 407 {
 408     return ff_add_format(avff, fmt);
 409 }
 410 AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
 411 {
 412     return ff_all_formats(type);
 413 }
 414 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
 415 {
 416     return ff_merge_formats(a, b);
 417 }
 418 void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 419 {
 420     ff_formats_ref(f, ref);
 421 }
 422 void avfilter_formats_unref(AVFilterFormats **ref)
 423 {
 424     ff_formats_unref(ref);
 425 }
 426 void avfilter_formats_changeref(AVFilterFormats **oldref,
 427                                 AVFilterFormats **newref)
 428 {
 429     ff_formats_changeref(oldref, newref);
 430 }
 431 #endif