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/* (C) 2001-2002 Nemosoft Unv. webcam@smcc.demon.nl
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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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(at your option) any later version.
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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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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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/* This is pwc-ioctl.h belonging to PWC 8.6 */
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2001/08/03 Alvarado Added ioctl constants to access methods for
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changing white balance and red/blue gains
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/* These are private ioctl() commands, specific for the Philips webcams.
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They contain functions not found in other webcams, and settings not
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specified in the Video4Linux API.
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The #define names are built up like follows:
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VIDIOC VIDeo IOCtl prefix
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/* The frame rate is encoded in the video_window.flags parameter using
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the upper 16 bits, since some flags are defined nowadays. The following
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defines provide a mask and shift to filter out this value.
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In 'Snapshot' mode the camera freezes its automatic exposure and colour
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#define PWC_FPS_SHIFT 16
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#define PWC_FPS_MASK 0x00FF0000
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#define PWC_FPS_FRMASK 0x003F0000
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#define PWC_FPS_SNAPSHOT 0x00400000
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/* pwc_whitebalance.mode values */
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#define PWC_WB_INDOOR 0
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#define PWC_WB_OUTDOOR 1
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#define PWC_WB_MANUAL 3
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/* Used with VIDIOCPWC[SG]AWB (Auto White Balance).
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Set mode to one of the PWC_WB_* values above.
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*red and *blue are the respective gains of these colour components inside
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the camera; range 0..65535
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When 'mode' == PWC_WB_MANUAL, 'manual_red' and 'manual_blue' are set or read;
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'read_red' and 'read_blue' are read-only.
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struct pwc_whitebalance
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int manual_red, manual_blue; /* R/W */
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int read_red, read_blue; /* R/O */
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'control_speed' and 'control_delay' are used in automatic whitebalance mode,
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and tell the camera how fast it should react to changes in lighting, and
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with how much delay. Valid values are 0..65535.
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/* Used with VIDIOCPWC[SG]LED */
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int led_on; /* Led on-time; range = 0..25000 */
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int led_off; /* Led off-time; range = 0..25000 */
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/* Restore user settings */
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#define VIDIOCPWCRUSER _IO('v', 192)
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/* Save user settings */
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#define VIDIOCPWCSUSER _IO('v', 193)
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/* Restore factory settings */
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#define VIDIOCPWCFACTORY _IO('v', 194)
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/* You can manipulate the compression factor. A compression preference of 0
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means use uncompressed modes when available; 1 is low compression, 2 is
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medium and 3 is high compression preferred. Of course, the higher the
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compression, the lower the bandwidth used but more chance of artefacts
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in the image. The driver automatically chooses a higher compression when
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the preferred mode is not available.
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/* Set preferred compression quality (0 = uncompressed, 3 = highest compression) */
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#define VIDIOCPWCSCQUAL _IOW('v', 195, int)
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/* Get preferred compression quality */
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#define VIDIOCPWCGCQUAL _IOR('v', 195, int)
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/* This is a probe function; since so many devices are supported, it
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becomes difficult to include all the names in programs that want to
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check for the enhanced Philips stuff. So in stead, try this PROBE;
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it returns a structure with the original name, and the corresponding
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To use, fill the structure with zeroes, call PROBE and if that succeeds,
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compare the name with that returned from VIDIOCGCAP; they should be the
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same. If so, you can be assured it is a Philips (OEM) cam and the type
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#define VIDIOCPWCPROBE _IOR('v', 199, struct pwc_probe)
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/* Set AGC (Automatic Gain Control); int < 0 = auto, 0..65535 = fixed */
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#define VIDIOCPWCSAGC _IOW('v', 200, int)
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/* Get AGC; int < 0 = auto; >= 0 = fixed, range 0..65535 */
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#define VIDIOCPWCGAGC _IOR('v', 200, int)
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/* Set shutter speed; int < 0 = auto; >= 0 = fixed, range 0..65535 */
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#define VIDIOCPWCSSHUTTER _IOW('v', 201, int)
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/* Color compensation (Auto White Balance) */
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#define VIDIOCPWCSAWB _IOW('v', 202, struct pwc_whitebalance)
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#define VIDIOCPWCGAWB _IOR('v', 202, struct pwc_whitebalance)
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#define VIDIOCPWCSAWBSPEED _IOW('v', 203, struct pwc_wb_speed)
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#define VIDIOCPWCGAWBSPEED _IOR('v', 203, struct pwc_wb_speed)
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/* LEDs on/off/blink; int range 0..65535 */
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#define VIDIOCPWCSLED _IOW('v', 205, struct pwc_leds)
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#define VIDIOCPWCGLED _IOR('v', 205, struct pwc_leds)
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/* Contour (sharpness); int < 0 = auto, 0..65536 = fixed */
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#define VIDIOCPWCSCONTOUR _IOW('v', 206, int)
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#define VIDIOCPWCGCONTOUR _IOR('v', 206, int)
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/* Backlight compensation; 0 = off, otherwise on */
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#define VIDIOCPWCSBACKLIGHT _IOW('v', 207, int)
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#define VIDIOCPWCGBACKLIGHT _IOR('v', 207, int)
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/* Flickerless mode; = 0 off, otherwise on */
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#define VIDIOCPWCSFLICKER _IOW('v', 208, int)
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#define VIDIOCPWCGFLICKER _IOR('v', 208, int)
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/* Dynamic noise reduction; 0 off, 3 = high noise reduction */
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#define VIDIOCPWCSDYNNOISE _IOW('v', 209, int)
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#define VIDIOCPWCGDYNNOISE _IOR('v', 209, int)
added
removed
include/pwc-ioctl.h
