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_all_samplerates(void)
 224 {
 225     AVFilterFormats *ret = av_mallocz(sizeof(*ret));
 226     return ret;
 227 }
 228
 229 AVFilterChannelLayouts *ff_all_channel_layouts(void)
 230 {
 231     AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
 232     return ret;
 233 }
 234
 235 #define FORMATS_REF(f, ref)                                          \
 236 do {                                                                 \
 237     *ref = f;                                                        \
 238     f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
 239     f->refs[f->refcount-1] = ref;                                    \
 240 } while (0)
 241
 242 void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
 243 {
 244     FORMATS_REF(f, ref);
 245 }
 246
 247 void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 248 {
 249     FORMATS_REF(f, ref);
 250 }
 251
 252 #define FIND_REF_INDEX(ref, idx)            \
 253 do {                                        \
 254     int i;                                  \
 255     for (i = 0; i < (*ref)->refcount; i ++) \
 256         if((*ref)->refs[i] == ref) {        \
 257             idx = i;                        \
 258             break;                          \
 259         }                                   \
 260 } while (0)
 261
 262 #define FORMATS_UNREF(ref, list)                                   \
 263 do {                                                               \
 264     int idx = -1;                                                  \
 265                                                                    \
 266     if (!*ref)                                                     \
 267         return;                                                    \
 268                                                                    \
 269     FIND_REF_INDEX(ref, idx);                                      \
 270                                                                    \
 271     if (idx >= 0)                                                  \
 272         memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,        \
 273             sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
 274                                                                    \
 275     if(!--(*ref)->refcount) {                                      \
 276         av_free((*ref)->list);                                     \
 277         av_free((*ref)->refs);                                     \
 278         av_free(*ref);                                             \
 279     }                                                              \
 280     *ref = NULL;                                                   \
 281 } while (0)
 282
 283 void ff_formats_unref(AVFilterFormats **ref)
 284 {
 285     FORMATS_UNREF(ref, formats);
 286 }
 287
 288 void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
 289 {
 290     FORMATS_UNREF(ref, channel_layouts);
 291 }
 292
 293 #define FORMATS_CHANGEREF(oldref, newref)       \
 294 do {                                            \
 295     int idx = -1;                               \
 296                                                 \
 297     FIND_REF_INDEX(oldref, idx);                \
 298                                                 \
 299     if (idx >= 0) {                             \
 300         (*oldref)->refs[idx] = newref;          \
 301         *newref = *oldref;                      \
 302         *oldref = NULL;                         \
 303     }                                           \
 304 } while (0)
 305
 306 void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
 307                                   AVFilterChannelLayouts **newref)
 308 {
 309     FORMATS_CHANGEREF(oldref, newref);
 310 }
 311
 312 void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
 313 {
 314     FORMATS_CHANGEREF(oldref, newref);
 315 }
 316
 317 #define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
 318 {                                                                   \
 319     int count = 0, i;                                               \
 320                                                                     \
 321     for (i = 0; i < ctx->input_count; i++) {                        \
 322         if (ctx->inputs[i]) {                                       \
 323             ref(fmts, &ctx->inputs[i]->out_fmts);                   \
 324             count++;                                                \
 325         }                                                           \
 326     }                                                               \
 327     for (i = 0; i < ctx->output_count; i++) {                       \
 328         if (ctx->outputs[i]) {                                      \
 329             ref(fmts, &ctx->outputs[i]->in_fmts);                   \
 330             count++;                                                \
 331         }                                                           \
 332     }                                                               \
 333                                                                     \
 334     if (!count) {                                                   \
 335         av_freep(&fmts->list);                                      \
 336         av_freep(&fmts->refs);                                      \
 337         av_freep(&fmts);                                            \
 338     }                                                               \
 339 }
 340
 341 void ff_set_common_channel_layouts(AVFilterContext *ctx,
 342                                    AVFilterChannelLayouts *layouts)
 343 {
 344     SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
 345                        ff_channel_layouts_ref, channel_layouts);
 346 }
 347
 348 void ff_set_common_samplerates(AVFilterContext *ctx,
 349                                AVFilterFormats *samplerates)
 350 {
 351     SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
 352                        ff_formats_ref, formats);
 353 }
 354
 355 /**
 356  * A helper for query_formats() which sets all links to the same list of
 357  * formats. If there are no links hooked to this filter, the list of formats is
 358  * freed.
 359  */
 360 void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 361 {
 362     SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
 363                        ff_formats_ref, formats);
 364 }
 365
 366 int ff_default_query_formats(AVFilterContext *ctx)
 367 {
 368     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
 369                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
 370                             AVMEDIA_TYPE_VIDEO;
 371
 372     ff_set_common_formats(ctx, ff_all_formats(type));
 373     if (type == AVMEDIA_TYPE_AUDIO) {
 374         ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
 375         ff_set_common_samplerates(ctx, ff_all_samplerates());
 376     }
 377
 378     return 0;
 379 }
 380
 381 #if FF_API_FILTERS_PUBLIC
 382 int avfilter_default_query_formats(AVFilterContext *ctx)
 383 {
 384     return ff_default_query_formats(ctx);
 385 }
 386 void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 387 {
 388     ff_set_common_formats(ctx, formats);
 389 }
 390 AVFilterFormats *avfilter_make_format_list(const int *fmts)
 391 {
 392     return ff_make_format_list(fmts);
 393 }
 394 int avfilter_add_format(AVFilterFormats **avff, int fmt)
 395 {
 396     return ff_add_format(avff, fmt);
 397 }
 398 AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
 399 {
 400     return ff_all_formats(type);
 401 }
 402 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
 403 {
 404     return ff_merge_formats(a, b);
 405 }
 406 void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 407 {
 408     ff_formats_ref(f, ref);
 409 }
 410 void avfilter_formats_unref(AVFilterFormats **ref)
 411 {
 412     ff_formats_unref(ref);
 413 }
 414 void avfilter_formats_changeref(AVFilterFormats **oldref,
 415                                 AVFilterFormats **newref)
 416 {
 417     ff_formats_changeref(oldref, newref);
 418 }
 419 #endif