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
25 #include "libavutil/attributes.h"
26 #include "libavutil/common.h"
27 #include "idctdsp.h"
28 #include "proresdsp.h"
29 #include "simple_idct.h"
30
31 #define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones
32 #define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels
33 #define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
34
35 #define CLIP(x) (av_clip((x), CLIP_MIN, CLIP_MAX))
36
37 /**
38 * Add bias value, clamp and output pixels of a slice
39 */
put_pixels(uint16_t * dst,int stride,const int16_t * in)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(in[src_offset]);
49 }
50 }
51 }
52
prores_idct_put_c(uint16_t * out,int linesize,int16_t * block,const int16_t * qmat)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
ff_proresdsp_init(ProresDSPContext * dsp,AVCodecContext * avctx)59 av_cold void ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
60 {
61 dsp->idct_put = prores_idct_put_c;
62 dsp->idct_permutation_type = FF_IDCT_PERM_NONE;
63
64 if (ARCH_X86)
65 ff_proresdsp_init_x86(dsp, avctx);
66
67 ff_init_scantable_permutation(dsp->idct_permutation,
68 dsp->idct_permutation_type);
69 }
70