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| | |
| | | /* |
| | | * 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 */ |