proresdsp.c
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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 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 "proresdsp.h"
24 #include "simple_idct.h"
25 #include "libavutil/common.h"
26 
27 #define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1))
28 #define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8))
29 #define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1
30 
31 #define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
32 
33 #if CONFIG_PRORES_DECODER
34 
37 static void put_pixels(uint16_t *dst, int stride, const DCTELEM *in)
38 {
39  int x, y, src_offset, dst_offset;
40 
41  for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += stride) {
42  for (x = 0; x < 8; x++) {
43  src_offset = (y << 3) + x;
44 
45  dst[dst_offset + x] = CLIP_AND_BIAS(in[src_offset]);
46  }
47  }
48 }
49 
50 static void prores_idct_put_c(uint16_t *out, int linesize, DCTELEM *block, const int16_t *qmat)
51 {
52  ff_prores_idct(block, qmat);
53  put_pixels(out, linesize >> 1, block);
54 }
55 #endif
56 
57 #if CONFIG_PRORES_ENCODER
58 static void prores_fdct_c(const uint16_t *src, int linesize, DCTELEM *block)
59 {
60  int x, y;
61  const uint16_t *tsrc = src;
62 
63  for (y = 0; y < 8; y++) {
64  for (x = 0; x < 8; x++)
65  block[y * 8 + x] = tsrc[x];
66  tsrc += linesize >> 1;
67  }
68  ff_jpeg_fdct_islow_10(block);
69 }
70 #endif
71 
73 {
74 #if CONFIG_PRORES_DECODER
75  dsp->idct_put = prores_idct_put_c;
77 
79 
82 #endif
83 #if CONFIG_PRORES_ENCODER
84  dsp->fdct = prores_fdct_c;
88 #endif
89 }
#define ARCH_X86
Definition: config.h:33
int idct_permutation_type
Definition: proresdsp.h:31
int stride
Definition: mace.c:144
void(* idct_put)(uint16_t *out, int linesize, DCTELEM *block, const int16_t *qmat)
Definition: proresdsp.h:35
uint8_t dct_permutation[64]
Definition: proresdsp.h:34
int dct_permutation_type
Definition: proresdsp.h:33
static DCTELEM block[64]
Definition: dct-test.c:169
uint8_t idct_permutation[64]
Definition: proresdsp.h:32
#define FF_NO_IDCT_PERM
Definition: dsputil.h:427
void ff_prores_idct(DCTELEM *block, const int16_t *qmat)
Special version of ff_simple_idct_10() which does dequantization and scales by a factor of 2 more bet...
Definition: simple_idct.c:222
void ff_jpeg_fdct_islow_10(DCTELEM *data)
void(* fdct)(const uint16_t *src, int linesize, DCTELEM *block)
Definition: proresdsp.h:36
#define CLIP_AND_BIAS(x)
Definition: proresdsp.c:31
void ff_proresdsp_x86_init(ProresDSPContext *dsp)
void ff_init_scantable_permutation(uint8_t *idct_permutation, int idct_permutation_type)
Definition: dsputil.c:143
short DCTELEM
Definition: dsputil.h:39
void ff_proresdsp_init(ProresDSPContext *dsp)
Definition: proresdsp.c:72
common internal and external API header
simple idct header.