32654fba2f
As reported by Coverity, there's a potential risk of a division by zero on some calls to jpeg_set_qual(), if quality is zero. As quality can't be 0 or lower than that, adds an extra clause to cover this special case. Coverity reports: CID#11922280, CID#11922293, CID#11922295 Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
171 lines
5.9 KiB
C
171 lines
5.9 KiB
C
#ifndef JPEG_H
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#define JPEG_H 1
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/*
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* Insert a JPEG header at start of frame
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*
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* This module is used by the gspca subdrivers.
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* A special case is done for Conexant webcams.
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*
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* Copyright (C) Jean-Francois Moine (http://moinejf.free.fr)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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* generation options
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* CONEX_CAM Conexant if present
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*/
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/* JPEG header */
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static const u8 jpeg_head[] = {
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0xff, 0xd8, /* jpeg */
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/* quantization table quality 50% */
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0xff, 0xdb, 0x00, 0x84, /* DQT */
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0,
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#define JPEG_QT0_OFFSET 7
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0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e,
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0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28,
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0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
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0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33,
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0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44,
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0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57,
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0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71,
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0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63,
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1,
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#define JPEG_QT1_OFFSET 72
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0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a,
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0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
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/* huffman table */
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0xff, 0xc4, 0x01, 0xa2,
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0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
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0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03,
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0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00,
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0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04,
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0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13,
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0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81,
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0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15,
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0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82,
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0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25,
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0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36,
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0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46,
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0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56,
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0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66,
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0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
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0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86,
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0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95,
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0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4,
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0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3,
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0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2,
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0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca,
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0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9,
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0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
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0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5,
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0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02,
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0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05,
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0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01,
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0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06,
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0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22,
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0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1,
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0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62,
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0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25,
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0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
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0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
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0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
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0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
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0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
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0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3,
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0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2,
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0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa,
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#ifdef CONEX_CAM
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/* the Conexant frames start with SOF0 */
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#define JPEG_HDR_SZ 556
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#else
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0xff, 0xc0, 0x00, 0x11, /* SOF0 (start of frame 0 */
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0x08, /* data precision */
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#define JPEG_HEIGHT_OFFSET 561
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0x01, 0xe0, /* height */
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0x02, 0x80, /* width */
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0x03, /* component number */
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0x01,
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0x21, /* samples Y */
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0x00, /* quant Y */
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0x02, 0x11, 0x01, /* samples CbCr - quant CbCr */
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0x03, 0x11, 0x01,
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0xff, 0xda, 0x00, 0x0c, /* SOS (start of scan) */
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0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00
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#define JPEG_HDR_SZ 589
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#endif
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};
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/* define the JPEG header */
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static void jpeg_define(u8 *jpeg_hdr,
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int height,
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int width,
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int samplesY)
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{
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memcpy(jpeg_hdr, jpeg_head, sizeof jpeg_head);
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#ifndef CONEX_CAM
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 0] = height >> 8;
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 1] = height;
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8;
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width;
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 6] = samplesY;
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#endif
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}
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/* set the JPEG quality */
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static void jpeg_set_qual(u8 *jpeg_hdr,
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int quality)
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{
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int i, sc;
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if (quality <= 0)
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sc = 5000;
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else if (quality < 50)
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sc = 5000 / quality;
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else
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sc = 200 - quality * 2;
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for (i = 0; i < 64; i++) {
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jpeg_hdr[JPEG_QT0_OFFSET + i] =
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(jpeg_head[JPEG_QT0_OFFSET + i] * sc + 50) / 100;
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jpeg_hdr[JPEG_QT1_OFFSET + i] =
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(jpeg_head[JPEG_QT1_OFFSET + i] * sc + 50) / 100;
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}
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}
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#endif
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