ac05d6176d65dfe15fb7f1fb40ecfaaa2e456b22
[libav.git] / libavcodec / proresdsp.c
1 /*
2 * Apple ProRes compatible decoder
3 *
4 * Copyright (c) 2010-2011 Maxim Poliakovski
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "libavutil/attributes.h"
24 #include "libavutil/common.h"
25 #include "dct.h"
26 #include "dsputil.h"
27 #include "proresdsp.h"
28 #include "simple_idct.h"
29
30 #define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones
31 #define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels
32 #define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
33
34 #define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
35
36 #if CONFIG_PRORES_DECODER
37 /**
38 * Add bias value, clamp and output pixels of a slice
39 */
40 static void put_pixels(uint16_t *dst, int stride, const int16_t *in)
41 {
42 int x, y, src_offset, dst_offset;
43
44 for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
45 for (x = 0; x < 8; x++) {
46 src_offset = (y << 3) + x;
47
48 dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
49 }
50 }
51 }
52
53 static void prores_idct_put_c(uint16_t *out, int linesize, int16_t *block, const int16_t *qmat)
54 {
55 ff_prores_idct(block, qmat);
56 put_pixels(out, linesize >> 1, block);
57 }
58 #endif
59
60 #if CONFIG_PRORES_ENCODER
61 static void prores_fdct_c(const uint16_t *src, int linesize, int16_t *block)
62 {
63 int x, y;
64 const uint16_t *tsrc = src;
65
66 for (y = 0; y < 8; y++) {
67 for (x = 0; x < 8; x++)
68 block[y * 8 + x] = tsrc[x];
69 tsrc += linesize >> 1;
70 }
71 ff_jpeg_fdct_islow_10(block);
72 }
73 #endif
74
75 av_cold void ff_proresdsp_init(ProresDSPContext *dsp)
76 {
77 #if CONFIG_PRORES_DECODER
78 dsp->idct_put = prores_idct_put_c;
79 dsp->idct_permutation_type = FF_NO_IDCT_PERM;
80
81 if (ARCH_X86)
82 ff_proresdsp_init_x86(dsp);
83
84 ff_init_scantable_permutation(dsp->idct_permutation,
85 dsp->idct_permutation_type);
86 #endif
87 #if CONFIG_PRORES_ENCODER
88 dsp->fdct = prores_fdct_c;
89 dsp->dct_permutation_type = FF_NO_IDCT_PERM;
90 ff_init_scantable_permutation(dsp->dct_permutation,
91 dsp->dct_permutation_type);
92 #endif
93 }