Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / idctdsp.h
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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 */
29typedef struct ScanTable {
30 const uint8_t *scantable;
31 uint8_t permutated[64];
32 uint8_t raster_end[64];
33} ScanTable;
34
35enum 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
44void ff_init_scantable(uint8_t *permutation, ScanTable *st,
45 const uint8_t *src_scantable);
46void ff_init_scantable_permutation(uint8_t *idct_permutation,
47 enum idct_permutation_type perm_type);
48int ff_init_scantable_permutation_x86(uint8_t *idct_permutation,
49 enum idct_permutation_type perm_type);
50
51typedef 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 */,
f6fa7814 55 ptrdiff_t line_size);
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56 void (*put_signed_pixels_clamped)(const int16_t *block /* align 16 */,
57 uint8_t *pixels /* align 8 */,
f6fa7814 58 ptrdiff_t line_size);
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59 void (*add_pixels_clamped)(const int16_t *block /* align 16 */,
60 uint8_t *pixels /* align 8 */,
f6fa7814 61 ptrdiff_t line_size);
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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
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98extern void (*ff_put_pixels_clamped)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size);
99extern void (*ff_add_pixels_clamped)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size);
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100
101void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx);
102
103void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx,
104 unsigned high_bit_depth);
105void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx,
106 unsigned high_bit_depth);
107void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx,
108 unsigned high_bit_depth);
109void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx,
110 unsigned high_bit_depth);
111
112#endif /* AVCODEC_IDCTDSP_H */