169 lines
5.8 KiB
C
169 lines
5.8 KiB
C
#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)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* 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 < 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
|