mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 09:52:17 +00:00
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
|
|
* 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 */
|