| 1 | /* |
| 2 | * This file is part of FFmpeg. |
| 3 | * |
| 4 | * FFmpeg is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * FFmpeg is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with FFmpeg; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | #ifndef AVCODEC_IDCTDSP_H |
| 20 | #define AVCODEC_IDCTDSP_H |
| 21 | |
| 22 | #include <stdint.h> |
| 23 | |
| 24 | #include "avcodec.h" |
| 25 | |
| 26 | /** |
| 27 | * Scantable. |
| 28 | */ |
| 29 | typedef struct ScanTable { |
| 30 | const uint8_t *scantable; |
| 31 | uint8_t permutated[64]; |
| 32 | uint8_t raster_end[64]; |
| 33 | } ScanTable; |
| 34 | |
| 35 | enum idct_permutation_type { |
| 36 | FF_IDCT_PERM_NONE, |
| 37 | FF_IDCT_PERM_LIBMPEG2, |
| 38 | FF_IDCT_PERM_SIMPLE, |
| 39 | FF_IDCT_PERM_TRANSPOSE, |
| 40 | FF_IDCT_PERM_PARTTRANS, |
| 41 | FF_IDCT_PERM_SSE2, |
| 42 | }; |
| 43 | |
| 44 | void ff_init_scantable(uint8_t *permutation, ScanTable *st, |
| 45 | const uint8_t *src_scantable); |
| 46 | void ff_init_scantable_permutation(uint8_t *idct_permutation, |
| 47 | enum idct_permutation_type perm_type); |
| 48 | int ff_init_scantable_permutation_x86(uint8_t *idct_permutation, |
| 49 | enum idct_permutation_type perm_type); |
| 50 | |
| 51 | typedef struct IDCTDSPContext { |
| 52 | /* pixel ops : interface with DCT */ |
| 53 | void (*put_pixels_clamped)(const int16_t *block /* align 16 */, |
| 54 | uint8_t *pixels /* align 8 */, |
| 55 | int line_size); |
| 56 | void (*put_signed_pixels_clamped)(const int16_t *block /* align 16 */, |
| 57 | uint8_t *pixels /* align 8 */, |
| 58 | int line_size); |
| 59 | void (*add_pixels_clamped)(const int16_t *block /* align 16 */, |
| 60 | uint8_t *pixels /* align 8 */, |
| 61 | int line_size); |
| 62 | |
| 63 | void (*idct)(int16_t *block /* align 16 */); |
| 64 | |
| 65 | /** |
| 66 | * block -> idct -> clip to unsigned 8 bit -> dest. |
| 67 | * (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...) |
| 68 | * @param line_size size in bytes of a horizontal line of dest |
| 69 | */ |
| 70 | void (*idct_put)(uint8_t *dest /* align 8 */, |
| 71 | int line_size, int16_t *block /* align 16 */); |
| 72 | |
| 73 | /** |
| 74 | * block -> idct -> add dest -> clip to unsigned 8 bit -> dest. |
| 75 | * @param line_size size in bytes of a horizontal line of dest |
| 76 | */ |
| 77 | void (*idct_add)(uint8_t *dest /* align 8 */, |
| 78 | int line_size, int16_t *block /* align 16 */); |
| 79 | |
| 80 | /** |
| 81 | * IDCT input permutation. |
| 82 | * Several optimized IDCTs need a permutated input (relative to the |
| 83 | * normal order of the reference IDCT). |
| 84 | * This permutation must be performed before the idct_put/add. |
| 85 | * Note, normally this can be merged with the zigzag/alternate scan<br> |
| 86 | * An example to avoid confusion: |
| 87 | * - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...) |
| 88 | * - (x -> reference DCT -> reference IDCT -> x) |
| 89 | * - (x -> reference DCT -> simple_mmx_perm = idct_permutation |
| 90 | * -> simple_idct_mmx -> x) |
| 91 | * - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant |
| 92 | * -> simple_idct_mmx -> ...) |
| 93 | */ |
| 94 | uint8_t idct_permutation[64]; |
| 95 | enum idct_permutation_type perm_type; |
| 96 | } IDCTDSPContext; |
| 97 | |
| 98 | extern void (*ff_put_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size); |
| 99 | extern void (*ff_add_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size); |
| 100 | |
| 101 | void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx); |
| 102 | |
| 103 | void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx, |
| 104 | unsigned high_bit_depth); |
| 105 | void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx, |
| 106 | unsigned high_bit_depth); |
| 107 | void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx, |
| 108 | unsigned high_bit_depth); |
| 109 | void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx, |
| 110 | unsigned high_bit_depth); |
| 111 | |
| 112 | #endif /* AVCODEC_IDCTDSP_H */ |