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