summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/gspca/jpeg.h
blob: 660081dcb8521f629b0ee7228908e066899f8180 (plain)
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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef JPEG_H
#define JPEG_H 1
/*
 * Insert a JPEG header at start of frame
 *
 * This module is used by the gspca subdrivers.
 * A special case is done for Conexant webcams.
 *
 * Copyright (C) Jean-Francois Moine (http://moinejf.free.fr)
 */

/*
 * generation options
 *	CONEX_CAM	Conexant if present
 */

/* JPEG header */
static const u8 jpeg_head[] = {
	0xff, 0xd8,			/* jpeg */

/* quantization table quality 50% */
	0xff, 0xdb, 0x00, 0x84,		/* DQT */
0,
#define JPEG_QT0_OFFSET 7
	0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e,
	0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28,
	0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
	0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33,
	0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44,
	0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57,
	0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71,
	0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63,
1,
#define JPEG_QT1_OFFSET 72
	0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a,
	0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,

/* huffman table */
	0xff, 0xc4, 0x01, 0xa2,
	0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
	0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
	0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03,
	0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00,
	0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04,
	0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13,
	0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81,
	0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15,
	0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82,
	0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25,
	0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36,
	0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46,
	0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56,
	0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66,
	0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
	0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86,
	0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95,
	0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4,
	0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3,
	0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2,
	0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca,
	0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9,
	0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
	0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5,
	0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02,
	0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05,
	0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01,
	0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06,
	0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22,
	0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1,
	0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62,
	0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25,
	0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28,
	0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
	0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
	0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
	0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
	0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
	0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
	0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
	0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
	0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
	0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
	0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
	0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3,
	0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2,
	0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa,
#ifdef CONEX_CAM
/* the Conexant frames start with SOF0 */
#define JPEG_HDR_SZ 556
#else
	0xff, 0xc0, 0x00, 0x11,		/* SOF0 (start of frame 0 */
	0x08,				/* data precision */
#define JPEG_HEIGHT_OFFSET 561
	0x01, 0xe0,			/* height */
	0x02, 0x80,			/* width */
	0x03,				/* component number */
		0x01,
			0x21,		/* samples Y */
			0x00,		/* quant Y */
		0x02, 0x11, 0x01,	/* samples CbCr - quant CbCr */
		0x03, 0x11, 0x01,

	0xff, 0xda, 0x00, 0x0c,		/* SOS (start of scan) */
	0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00
#define JPEG_HDR_SZ 589
#endif
};

/* define the JPEG header */
static void jpeg_define(u8 *jpeg_hdr,
			int height,
			int width,
			int samplesY)
{
	memcpy(jpeg_hdr, jpeg_head, sizeof jpeg_head);
#ifndef CONEX_CAM
	jpeg_hdr[JPEG_HEIGHT_OFFSET + 0] = height >> 8;
	jpeg_hdr[JPEG_HEIGHT_OFFSET + 1] = height;
	jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8;
	jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width;
	jpeg_hdr[JPEG_HEIGHT_OFFSET + 6] = samplesY;
#endif
}

/* set the JPEG quality */
static void jpeg_set_qual(u8 *jpeg_hdr,
			  int quality)
{
	int i, sc;

	if (quality <= 0)
		sc = 5000;
	else if (quality < 50)
		sc = 5000 / quality;
	else
		sc = 200 - quality * 2;
	for (i = 0; i < 64; i++) {
		jpeg_hdr[JPEG_QT0_OFFSET + i] =
			(jpeg_head[JPEG_QT0_OFFSET + i] * sc + 50) / 100;
		jpeg_hdr[JPEG_QT1_OFFSET + i] =
			(jpeg_head[JPEG_QT1_OFFSET + i] * sc + 50) / 100;
	}
}
#endif