| /* |
| * SN9C2028 common functions |
| * |
| * Copyright (C) 2009 Theodore Kilgore <kilgota@auburn,edu> |
| * |
| * Based closely upon the file gspca/pac_common.h |
| * |
| * 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 |
| * (at your option) 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 |
| * |
| */ |
| |
| static const unsigned char sn9c2028_sof_marker[5] = |
| { 0xff, 0xff, 0x00, 0xc4, 0xc4 }; |
| |
| static unsigned char *sn9c2028_find_sof(struct gspca_dev *gspca_dev, |
| unsigned char *m, int len) |
| { |
| struct sd *sd = (struct sd *) gspca_dev; |
| int i; |
| |
| /* Search for the SOF marker (fixed part) in the header */ |
| for (i = 0; i < len; i++) { |
| if (m[i] == sn9c2028_sof_marker[sd->sof_read]) { |
| sd->sof_read++; |
| if (sd->sof_read == sizeof(sn9c2028_sof_marker)) { |
| PDEBUG(D_FRAM, |
| "SOF found, bytes to analyze: %u." |
| " Frame starts at byte #%u", |
| len, i + 1); |
| sd->sof_read = 0; |
| return m + i + 1; |
| } |
| } else { |
| sd->sof_read = 0; |
| } |
| } |
| |
| return NULL; |
| } |