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author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
commit | fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 (patch) | |
tree | 22962a4387943edc841c72a4e636a068c66d58fd /drivers/media/video/gspca/pac_common.h | |
download | ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.zip ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.tar.gz |
Initial import of modified Linux 2.6.28 tree
Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y
Diffstat (limited to 'drivers/media/video/gspca/pac_common.h')
-rw-r--r-- | drivers/media/video/gspca/pac_common.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/media/video/gspca/pac_common.h b/drivers/media/video/gspca/pac_common.h new file mode 100644 index 0000000..34d4b14 --- /dev/null +++ b/drivers/media/video/gspca/pac_common.h @@ -0,0 +1,60 @@ +/* + * Pixart PAC207BCA / PAC73xx common functions + * + * Copyright (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl> + * Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li + * Copyleft (C) 2005 Michel Xhaard mxhaard@magic.fr + * + * V4L2 by 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 + * (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 + * + */ + +/* We calculate the autogain at the end of the transfer of a frame, at this + moment a frame with the old settings is being transmitted, and a frame is + being captured with the old settings. So if we adjust the autogain we must + ignore atleast the 2 next frames for the new settings to come into effect + before doing any other adjustments */ +#define PAC_AUTOGAIN_IGNORE_FRAMES 3 + +static const unsigned char pac_sof_marker[5] = + { 0xff, 0xff, 0x00, 0xff, 0x96 }; + +static unsigned char *pac_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] == pac_sof_marker[sd->sof_read]) { + sd->sof_read++; + if (sd->sof_read == sizeof(pac_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; +} |