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Diffstat (limited to 'libavcodec/idctdsp.h')
| -rw-r--r-- | libavcodec/idctdsp.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/libavcodec/idctdsp.h b/libavcodec/idctdsp.h new file mode 100644 index 0000000000..e3a2317679 --- /dev/null +++ b/libavcodec/idctdsp.h @@ -0,0 +1,104 @@ +/* + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_IDCTDSP_H +#define AVCODEC_IDCTDSP_H + +#include <stdint.h> + +#include "avcodec.h" + +/** + * Scantable. + */ +typedef struct ScanTable { + const uint8_t *scantable; + uint8_t permutated[64]; + uint8_t raster_end[64]; +} ScanTable; + +void ff_init_scantable(uint8_t *permutation, ScanTable *st, + const uint8_t *src_scantable); +void ff_init_scantable_permutation(uint8_t *idct_permutation, + int idct_permutation_type); +int ff_init_scantable_permutation_x86(uint8_t *idct_permutation, + int idct_permutation_type); + +typedef struct IDCTDSPContext { + /* pixel ops : interface with DCT */ + void (*put_pixels_clamped)(const int16_t *block /* align 16 */, + uint8_t *pixels /* align 8 */, + int line_size); + void (*put_signed_pixels_clamped)(const int16_t *block /* align 16 */, + uint8_t *pixels /* align 8 */, + int line_size); + void (*add_pixels_clamped)(const int16_t *block /* align 16 */, + uint8_t *pixels /* align 8 */, + int line_size); + + void (*idct)(int16_t *block /* align 16 */); + + /** + * block -> idct -> clip to unsigned 8 bit -> dest. + * (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...) + * @param line_size size in bytes of a horizontal line of dest + */ + void (*idct_put)(uint8_t *dest /* align 8 */, + int line_size, int16_t *block /* align 16 */); + + /** + * block -> idct -> add dest -> clip to unsigned 8 bit -> dest. + * @param line_size size in bytes of a horizontal line of dest + */ + void (*idct_add)(uint8_t *dest /* align 8 */, + int line_size, 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]; + int idct_permutation_type; +#define FF_NO_IDCT_PERM 1 +#define FF_LIBMPEG2_IDCT_PERM 2 +#define FF_SIMPLE_IDCT_PERM 3 +#define FF_TRANSPOSE_IDCT_PERM 4 +#define FF_PARTTRANS_IDCT_PERM 5 +#define FF_SSE2_IDCT_PERM 6 +} IDCTDSPContext; + +void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx); + +void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx, + unsigned high_bit_depth); +void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx, + unsigned high_bit_depth); +void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx, + unsigned high_bit_depth); + +#endif /* AVCODEC_IDCTDSP_H */ |