Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / proresdsp.c
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 }