mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.5 KiB
84 lines
2.5 KiB
/* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVCODEC_AVDCT_H |
|
#define AVCODEC_AVDCT_H |
|
|
|
#include "libavutil/opt.h" |
|
|
|
/** |
|
* AVDCT context. |
|
* @note function pointers can be NULL if the specific features have been |
|
* disabled at build time. |
|
*/ |
|
typedef struct AVDCT { |
|
const AVClass *av_class; |
|
|
|
void (*idct)(int16_t *block /* align 16 */); |
|
|
|
/** |
|
* IDCT input permutation. |
|
* Several optimized IDCTs need a permutated input (relative to the |
|
* normal order of the reference IDCT). |
|
* This permutation must be performed before the idct_put/add. |
|
* Note, normally this can be merged with the zigzag/alternate scan<br> |
|
* An example to avoid confusion: |
|
* - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...) |
|
* - (x -> reference DCT -> reference IDCT -> x) |
|
* - (x -> reference DCT -> simple_mmx_perm = idct_permutation |
|
* -> simple_idct_mmx -> x) |
|
* - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant |
|
* -> simple_idct_mmx -> ...) |
|
*/ |
|
uint8_t idct_permutation[64]; |
|
|
|
void (*fdct)(int16_t *block /* align 16 */); |
|
|
|
|
|
/** |
|
* DCT algorithm. |
|
* must use AVOptions to set this field. |
|
*/ |
|
int dct_algo; |
|
|
|
/** |
|
* IDCT algorithm. |
|
* must use AVOptions to set this field. |
|
*/ |
|
int idct_algo; |
|
|
|
void (*get_pixels)(int16_t *block /* align 16 */, |
|
const uint8_t *pixels /* align 8 */, |
|
ptrdiff_t line_size); |
|
|
|
int bits_per_sample; |
|
} AVDCT; |
|
|
|
/** |
|
* Allocates a AVDCT context. |
|
* This needs to be initialized with avcodec_dct_init() after optionally |
|
* configuring it with AVOptions. |
|
* |
|
* To free it use av_free() |
|
*/ |
|
AVDCT *avcodec_dct_alloc(void); |
|
int avcodec_dct_init(AVDCT *); |
|
|
|
const AVClass *avcodec_dct_get_class(void); |
|
|
|
#endif /* AVCODEC_AVDCT_H */
|
|
|