xref: /third_party/ffmpeg/libavcodec/proresdsp.c (revision cabdff1a) 
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 CLIP_MIN (1 << 2)                     ///< minimum value for clipping resulting pixels
31#define CLIP_MAX_10 (1 << 10) - CLIP_MIN - 1  ///< maximum value for clipping resulting pixels
32#define CLIP_MAX_12 (1 << 12) - CLIP_MIN - 1  ///< maximum value for clipping resulting pixels
33
34#define CLIP_10(x) (av_clip((x), CLIP_MIN, CLIP_MAX_10))
35#define CLIP_12(x) (av_clip((x), CLIP_MIN, CLIP_MAX_12))
36
37/**
38 * Add bias value, clamp and output pixels of a slice
39 */
40
41static inline void put_pixel(uint16_t *dst, ptrdiff_t linesize, const int16_t *in, int bits_per_raw_sample) {
42    int x, y, src_offset, dst_offset;
43
44    for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += linesize) {
45        for (x = 0; x < 8; x++) {
46            src_offset = (y << 3) + x;
47
48            if (bits_per_raw_sample == 10) {
49                dst[dst_offset + x] = CLIP_10(in[src_offset]);
50            } else {//12b
51                dst[dst_offset + x] = CLIP_12(in[src_offset]);
52            }
53        }
54    }
55}
56
57static void put_pixels_10(uint16_t *dst, ptrdiff_t linesize, const int16_t *in)
58{
59    put_pixel(dst, linesize, in, 10);
60}
61
62static void put_pixels_12(uint16_t *dst, ptrdiff_t linesize, const int16_t *in)
63{
64    put_pixel(dst, linesize, in, 12);
65}
66
67static void prores_idct_put_10_c(uint16_t *out, ptrdiff_t linesize, int16_t *block, const int16_t *qmat)
68{
69    ff_prores_idct_10(block, qmat);
70    put_pixels_10(out, linesize >> 1, block);
71}
72
73static void prores_idct_put_12_c(uint16_t *out, ptrdiff_t linesize, int16_t *block, const int16_t *qmat)
74{
75    ff_prores_idct_12(block, qmat);
76    put_pixels_12(out, linesize >> 1, block);
77}
78
79av_cold int ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
80{
81    if (avctx->bits_per_raw_sample == 10) {
82        dsp->idct_put = prores_idct_put_10_c;
83        dsp->idct_permutation_type = FF_IDCT_PERM_NONE;
84    } else if (avctx->bits_per_raw_sample == 12) {
85        dsp->idct_put = prores_idct_put_12_c;
86        dsp->idct_permutation_type = FF_IDCT_PERM_NONE;
87    } else {
88        return AVERROR_BUG;
89    }
90
91#if ARCH_X86
92    ff_proresdsp_init_x86(dsp, avctx);
93#endif
94
95    ff_init_scantable_permutation(dsp->idct_permutation,
96                                  dsp->idct_permutation_type);
97    return 0;
98}
99