2 * This file is part of FFmpeg.
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.
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.
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
19 #ifndef AVCODEC_IDCTDSP_H
20 #define AVCODEC_IDCTDSP_H
31 typedef struct ScanTable {
32 const uint8_t *scantable;
33 uint8_t permutated[64];
34 uint8_t raster_end[64];
37 enum idct_permutation_type {
39 FF_IDCT_PERM_LIBMPEG2,
41 FF_IDCT_PERM_TRANSPOSE,
42 FF_IDCT_PERM_PARTTRANS,
46 void ff_init_scantable(uint8_t *permutation, ScanTable *st,
47 const uint8_t *src_scantable);
48 void ff_init_scantable_permutation(uint8_t *idct_permutation,
49 enum idct_permutation_type perm_type);
50 int ff_init_scantable_permutation_x86(uint8_t *idct_permutation,
51 enum idct_permutation_type perm_type);
53 typedef struct IDCTDSPContext {
54 /* pixel ops : interface with DCT */
55 void (*put_pixels_clamped)(const int16_t *block /* align 16 */,
56 uint8_t *av_restrict pixels /* align 8 */,
58 void (*put_signed_pixels_clamped)(const int16_t *block /* align 16 */,
59 uint8_t *av_restrict pixels /* align 8 */,
61 void (*add_pixels_clamped)(const int16_t *block /* align 16 */,
62 uint8_t *av_restrict pixels /* align 8 */,
65 void (*idct)(int16_t *block /* align 16 */);
68 * block -> idct -> clip to unsigned 8 bit -> dest.
69 * (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...)
70 * @param line_size size in bytes of a horizontal line of dest
72 void (*idct_put)(uint8_t *dest /* align 8 */,
73 ptrdiff_t line_size, int16_t *block /* align 16 */);
76 * block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
77 * @param line_size size in bytes of a horizontal line of dest
79 void (*idct_add)(uint8_t *dest /* align 8 */,
80 ptrdiff_t line_size, int16_t *block /* align 16 */);
83 * IDCT input permutation.
84 * Several optimized IDCTs need a permutated input (relative to the
85 * normal order of the reference IDCT).
86 * This permutation must be performed before the idct_put/add.
87 * Note, normally this can be merged with the zigzag/alternate scan<br>
88 * An example to avoid confusion:
89 * - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...)
90 * - (x -> reference DCT -> reference IDCT -> x)
91 * - (x -> reference DCT -> simple_mmx_perm = idct_permutation
92 * -> simple_idct_mmx -> x)
93 * - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant
94 * -> simple_idct_mmx -> ...)
96 uint8_t idct_permutation[64];
97 enum idct_permutation_type perm_type;
100 extern void (*ff_put_pixels_clamped)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size);
101 extern void (*ff_add_pixels_clamped)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size);
103 void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx);
105 void ff_idctdsp_init_aarch64(IDCTDSPContext *c, AVCodecContext *avctx,
106 unsigned high_bit_depth);
107 void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx,
108 unsigned high_bit_depth);
109 void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx,
110 unsigned high_bit_depth);
111 void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx,
112 unsigned high_bit_depth);
113 void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx,
114 unsigned high_bit_depth);
115 void ff_idctdsp_init_mips(IDCTDSPContext *c, AVCodecContext *avctx,
116 unsigned high_bit_depth);
118 #endif /* AVCODEC_IDCTDSP_H */