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1 | /* |
2 | * Apple ProRes compatible decoder | |
3 | * | |
4 | * Copyright (c) 2010-2011 Maxim Poliakovski | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include "config.h" | |
24 | #include "libavutil/attributes.h" | |
25 | #include "libavutil/common.h" | |
26 | #include "idctdsp.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(x) (av_clip((x), CLIP_MIN, CLIP_MAX)) | |
35 | ||
36 | /** | |
37 | * Add bias value, clamp and output pixels of a slice | |
38 | */ | |
39 | static void put_pixels(uint16_t *dst, int stride, const int16_t *in) | |
40 | { | |
41 | int x, y, src_offset, dst_offset; | |
42 | ||
43 | for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) { | |
44 | for (x = 0; x < 8; x++) { | |
45 | src_offset = (y << 3) + x; | |
46 | ||
47 | dst[dst_offset + x] = CLIP(in[src_offset]); | |
48 | } | |
49 | } | |
50 | } | |
51 | ||
52 | static void prores_idct_put_c(uint16_t *out, int linesize, int16_t *block, const int16_t *qmat) | |
53 | { | |
54 | ff_prores_idct(block, qmat); | |
55 | put_pixels(out, linesize >> 1, block); | |
56 | } | |
57 | ||
58 | av_cold void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx) | |
59 | { | |
60 | dsp->idct_put = prores_idct_put_c; | |
61 | dsp->idct_permutation_type = FF_IDCT_PERM_NONE; | |
62 | ||
63 | if (ARCH_X86) | |
64 | ff_proresdsp_init_x86(dsp, avctx); | |
65 | ||
66 | ff_init_scantable_permutation(dsp->idct_permutation, | |
67 | dsp->idct_permutation_type); | |
68 | } |