diff options
| author | Vasily Khoruzhick <anarsoul@gmail.com> | 2015-04-24 04:04:04 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-05-30 11:48:09 -0300 |
| commit | d8fd9f56255cfeebe88b987543fd2d1399a35a25 (patch) | |
| tree | e566ae1e29e1c94d97a424c5a1982c973c81bad1 /drivers/media/usb/gspca/sn9c2028.h | |
| parent | 48c291eda79da46582438ec8d821c6efcd54120d (diff) | |
[media] gspca: sn9c2028: Add gain and autogain controls Genius Videocam Live v2
Autogain algorithm is very simple, if average luminance is low - increase gain,
if it's high - decrease gain. Gain granularity is low enough for this algo to
stabilize quickly.
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/usb/gspca/sn9c2028.h')
| -rw-r--r-- | drivers/media/usb/gspca/sn9c2028.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/media/usb/gspca/sn9c2028.h b/drivers/media/usb/gspca/sn9c2028.h index 8fd1d3e05665..f85bc106bc52 100644 --- a/drivers/media/usb/gspca/sn9c2028.h +++ b/drivers/media/usb/gspca/sn9c2028.h @@ -21,8 +21,15 @@ * */ -static const unsigned char sn9c2028_sof_marker[5] = - { 0xff, 0xff, 0x00, 0xc4, 0xc4 }; +static const unsigned char sn9c2028_sof_marker[] = { + 0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96, + 0x00, + 0x00, /* seq */ + 0x00, + 0x00, + 0x00, /* avg luminance lower 8 bit */ + 0x00, /* avg luminance higher 8 bit */ +}; static unsigned char *sn9c2028_find_sof(struct gspca_dev *gspca_dev, unsigned char *m, int len) @@ -32,8 +39,13 @@ static unsigned char *sn9c2028_find_sof(struct gspca_dev *gspca_dev, /* 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]) { + if ((m[i] == sn9c2028_sof_marker[sd->sof_read]) || + (sd->sof_read > 5)) { sd->sof_read++; + if (sd->sof_read == 11) + sd->avg_lum_l = m[i]; + if (sd->sof_read == 12) + sd->avg_lum = (m[i] << 8) + sd->avg_lum_l; if (sd->sof_read == sizeof(sn9c2028_sof_marker)) { PDEBUG(D_FRAM, "SOF found, bytes to analyze: %u." |