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
29 typedef struct ScanTable {
30 const uint8_t *scantable;
31 uint8_t permutated[64];
32 uint8_t raster_end[64];
35 void ff_init_scantable(uint8_t *permutation, ScanTable *st,
36 const uint8_t *src_scantable);
37 void ff_init_scantable_permutation(uint8_t *idct_permutation,
38 int idct_permutation_type);
39 int ff_init_scantable_permutation_x86(uint8_t *idct_permutation,
40 int idct_permutation_type);
42 typedef struct IDCTDSPContext {
43 /* pixel ops : interface with DCT */
44 void (*put_pixels_clamped)(const int16_t *block /* align 16 */,
45 uint8_t *pixels /* align 8 */,
47 void (*put_signed_pixels_clamped)(const int16_t *block /* align 16 */,
48 uint8_t *pixels /* align 8 */,
50 void (*add_pixels_clamped)(const int16_t *block /* align 16 */,
51 uint8_t *pixels /* align 8 */,
54 void (*idct)(int16_t *block /* align 16 */);
57 * block -> idct -> clip to unsigned 8 bit -> dest.
58 * (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...)
59 * @param line_size size in bytes of a horizontal line of dest
61 void (*idct_put)(uint8_t *dest /* align 8 */,
62 int line_size, int16_t *block /* align 16 */);
65 * block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
66 * @param line_size size in bytes of a horizontal line of dest
68 void (*idct_add)(uint8_t *dest /* align 8 */,
69 int line_size, int16_t *block /* align 16 */);
72 * IDCT input permutation.
73 * Several optimized IDCTs need a permutated input (relative to the
74 * normal order of the reference IDCT).
75 * This permutation must be performed before the idct_put/add.
76 * Note, normally this can be merged with the zigzag/alternate scan<br>
77 * An example to avoid confusion:
78 * - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...)
79 * - (x -> reference DCT -> reference IDCT -> x)
80 * - (x -> reference DCT -> simple_mmx_perm = idct_permutation
81 * -> simple_idct_mmx -> x)
82 * - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant
83 * -> simple_idct_mmx -> ...)
85 uint8_t idct_permutation[64];
86 int idct_permutation_type;
87 #define FF_NO_IDCT_PERM 1
88 #define FF_LIBMPEG2_IDCT_PERM 2
89 #define FF_SIMPLE_IDCT_PERM 3
90 #define FF_TRANSPOSE_IDCT_PERM 4
91 #define FF_PARTTRANS_IDCT_PERM 5
92 #define FF_SSE2_IDCT_PERM 6
95 void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx);
97 void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx,
98 unsigned high_bit_depth);
99 void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx,
100 unsigned high_bit_depth);
101 void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx,
102 unsigned high_bit_depth);
103 void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx,
104 unsigned high_bit_depth);
106 #endif /* AVCODEC_IDCTDSP_H */