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 enum idct_permutation_type
{
37 FF_IDCT_PERM_LIBMPEG2
,
39 FF_IDCT_PERM_TRANSPOSE
,
40 FF_IDCT_PERM_PARTTRANS
,
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
);
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 */,
56 void (*put_signed_pixels_clamped
)(const int16_t *block
/* align 16 */,
57 uint8_t *pixels
/* align 8 */,
59 void (*add_pixels_clamped
)(const int16_t *block
/* align 16 */,
60 uint8_t *pixels
/* align 8 */,
63 void (*idct
)(int16_t *block
/* align 16 */);
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
70 void (*idct_put
)(uint8_t *dest
/* align 8 */,
71 int line_size
, int16_t *block
/* align 16 */);
74 * block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
75 * @param line_size size in bytes of a horizontal line of dest
77 void (*idct_add
)(uint8_t *dest
/* align 8 */,
78 int line_size
, int16_t *block
/* align 16 */);
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 -> ...)
94 uint8_t idct_permutation
[64];
95 enum idct_permutation_type perm_type
;
98 extern void (*ff_put_pixels_clamped
)(const int16_t *block
, uint8_t *pixels
, ptrdiff_t line_size
);
99 extern void (*ff_add_pixels_clamped
)(const int16_t *block
, uint8_t *pixels
, ptrdiff_t line_size
);
101 void ff_idctdsp_init(IDCTDSPContext
*c
, AVCodecContext
*avctx
);
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
);
112 #endif /* AVCODEC_IDCTDSP_H */