1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
extern "C" {
#define MPEG_LUMA_MIN (16)
#define MPEG_CHROMA_MIN (16)
#define MPEG_LUMA_MAX (235)
#define MPEG_CHROMA_MAX (240)
#define JPEG_LUMA_MIN (0)
#define JPEG_CHROMA_MIN (1)
#define JPEG_LUMA_MAX (255)
#define JPEG_CHROMA_MAX (255)
__device__ int mpeg_min[] = {MPEG_LUMA_MIN, MPEG_CHROMA_MIN};
__device__ int mpeg_max[] = {MPEG_LUMA_MAX, MPEG_CHROMA_MAX};
__device__ int jpeg_min[] = {JPEG_LUMA_MIN, JPEG_CHROMA_MIN};
__device__ int jpeg_max[] = {JPEG_LUMA_MAX, JPEG_CHROMA_MAX};
__device__ int clamp(int val, int min, int max)
{
if (val < min)
return min;
else if (val > max)
return max;
else
return val;
}
__global__ void to_jpeg_cuda(const unsigned char* src, unsigned char* dst,
int pitch, int comp_id)
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
int src_, dst_;
// 8 bit -> 15 bit for better precision
src_ = static_cast<int>(src[x + y * pitch]) << 7;
// Conversion
dst_ = comp_id ? (min(src_, 30775) * 4663 - 9289992) >> 12 // chroma
: (min(src_, 30189) * 19077 - 39057361) >> 14; // luma
// Dither replacement
dst_ = dst_ + 64;
// Back to 8 bit
dst_ = clamp(dst_ >> 7, jpeg_min[comp_id], jpeg_max[comp_id]);
dst[x + y * pitch] = static_cast<unsigned char>(dst_);
}
__global__ void to_mpeg_cuda(const unsigned char* src, unsigned char* dst,
int pitch, int comp_id)
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
int src_, dst_;
// 8 bit -> 15 bit for better precision
src_ = static_cast<int>(src[x + y * pitch]) << 7;
// Conversion
dst_ = comp_id ? (src_ * 1799 + 4081085) >> 11 // chroma
: (src_ * 14071 + 33561947) >> 14; // luma
// Dither replacement
dst_ = dst_ + 64;
// Back to 8 bit
dst_ = clamp(dst_ >> 7, mpeg_min[comp_id], mpeg_max[comp_id]);
dst[x + y * pitch] = static_cast<unsigned char>(dst_);
}
}
|
