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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 "dct.h"
24 #include "dsputil.h"
25 #include "proresdsp.h"
26 #include "simple_idct.h"
27 #include "libavutil/common.h"
28 
29 #define BIAS (1 << (PRORES_BITS_PER_SAMPLE - 1)) ///< bias value for converting signed pixels into unsigned ones
30 #define CLIP_MIN (1 << (PRORES_BITS_PER_SAMPLE - 8)) ///< minimum value for clipping resulting pixels
31 #define CLIP_MAX (1 << PRORES_BITS_PER_SAMPLE) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
32 
33 #define CLIP_AND_BIAS(x) (av_clip((x) + BIAS, CLIP_MIN, CLIP_MAX))
34 
35 #if CONFIG_PRORES_DECODER | CONFIG_PRORES_LGPL_DECODER
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_AND_BIAS(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 #endif
58 
59 #if CONFIG_PRORES_KOSTYA_ENCODER
60 static void prores_fdct_c(const uint16_t *src, int linesize, int16_t *block)
61 {
62  int x, y;
63  const uint16_t *tsrc = src;
64 
65  for (y = 0; y < 8; y++) {
66  for (x = 0; x < 8; x++)
67  block[y * 8 + x] = tsrc[x];
68  tsrc += linesize >> 1;
69  }
70  ff_jpeg_fdct_islow_10(block);
71 }
72 #endif
73 
75 {
76 #if CONFIG_PRORES_DECODER | CONFIG_PRORES_LGPL_DECODER
77  dsp->idct_put = prores_idct_put_c;
79 
80  if (ARCH_X86) ff_proresdsp_x86_init(dsp, avctx);
81 
84 #endif
85 #if CONFIG_PRORES_KOSTYA_ENCODER
86  dsp->fdct = prores_fdct_c;
90 #endif
91 }