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v4l2.py
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v4l2.py
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# Python bindings for the v4l2 userspace api
# Copyright (C) 1999-2009 the contributors
# 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.
# Alternatively you can redistribute this file under the terms of the
# BSD license as stated below:
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# 3. The names of its contributors may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""
Python bindings for the v4l2 userspace api in Linux 2.6.34
"""
# see linux/videodev2.h
import ctypes
_IOC_NRBITS = 8
_IOC_TYPEBITS = 8
_IOC_SIZEBITS = 14
_IOC_DIRBITS = 2
_IOC_NRSHIFT = 0
_IOC_TYPESHIFT = _IOC_NRSHIFT + _IOC_NRBITS
_IOC_SIZESHIFT = _IOC_TYPESHIFT + _IOC_TYPEBITS
_IOC_DIRSHIFT = _IOC_SIZESHIFT + _IOC_SIZEBITS
_IOC_NONE = 0
_IOC_WRITE = 1
_IOC_READ = 2
def _IOC(dir_, type_, nr, size):
return (
ctypes.c_int32(dir_ << _IOC_DIRSHIFT).value |
ctypes.c_int32(ord(type_) << _IOC_TYPESHIFT).value |
ctypes.c_int32(nr << _IOC_NRSHIFT).value |
ctypes.c_int32(size << _IOC_SIZESHIFT).value)
def _IOC_TYPECHECK(t):
return ctypes.sizeof(t)
def _IO(type_, nr):
return _IOC(_IOC_NONE, type_, nr, 0)
def _IOW(type_, nr, size):
return _IOC(_IOC_WRITE, type_, nr, _IOC_TYPECHECK(size))
def _IOR(type_, nr, size):
return _IOC(_IOC_READ, type_, nr, _IOC_TYPECHECK(size))
def _IOWR(type_, nr, size):
return _IOC(_IOC_READ | _IOC_WRITE, type_, nr, _IOC_TYPECHECK(size))
#
# type alias
#
enum = ctypes.c_uint
c_int = ctypes.c_int
#
# time
#
class timeval(ctypes.Structure):
_fields_ = [
('secs', ctypes.c_long),
('usecs', ctypes.c_long),
]
#
# v4l2
#
VIDEO_MAX_FRAME = 32
VIDEO_MAX_PLANES = 8
VID_TYPE_CAPTURE = 1
VID_TYPE_TUNER = 2
VID_TYPE_TELETEXT = 4
VID_TYPE_OVERLAY = 8
VID_TYPE_CHROMAKEY = 16
VID_TYPE_CLIPPING = 32
VID_TYPE_FRAMERAM = 64
VID_TYPE_SCALES = 128
VID_TYPE_MONOCHROME = 256
VID_TYPE_SUBCAPTURE = 512
VID_TYPE_MPEG_DECODER = 1024
VID_TYPE_MPEG_ENCODER = 2048
VID_TYPE_MJPEG_DECODER = 4096
VID_TYPE_MJPEG_ENCODER = 8192
def v4l2_fourcc(a, b, c, d):
return ord(a) | (ord(b) << 8) | (ord(c) << 16) | (ord(d) << 24)
def get_fourcc(str):
if len(str) != 4:
raise ValueError(f'v4l2: Invalid fourcc: {str}')
return v4l2_fourcc(str[0], str[1], str[2], str[3])
def get_mem_type(str):
if str == 'MMAP':
return V4L2_MEMORY_MMAP
if str == 'DMABUF':
return V4L2_MEMORY_DMABUF
raise ValueError(f'v4l2: Invalid mem type: {str}, please use MMAP or DMABUF')
v4l2_field = enum
(
V4L2_FIELD_ANY,
V4L2_FIELD_NONE,
V4L2_FIELD_TOP,
V4L2_FIELD_BOTTOM,
V4L2_FIELD_INTERLACED,
V4L2_FIELD_SEQ_TB,
V4L2_FIELD_SEQ_BT,
V4L2_FIELD_ALTERNATE,
V4L2_FIELD_INTERLACED_TB,
V4L2_FIELD_INTERLACED_BT,
) = range(10)
def V4L2_FIELD_HAS_TOP(field):
return (
field == V4L2_FIELD_TOP or
field == V4L2_FIELD_INTERLACED or
field == V4L2_FIELD_INTERLACED_TB or
field == V4L2_FIELD_INTERLACED_BT or
field == V4L2_FIELD_SEQ_TB or
field == V4L2_FIELD_SEQ_BT)
def V4L2_FIELD_HAS_BOTTOM(field):
return (
field == V4L2_FIELD_BOTTOM or
field == V4L2_FIELD_INTERLACED or
field == V4L2_FIELD_INTERLACED_TB or
field == V4L2_FIELD_INTERLACED_BT or
field == V4L2_FIELD_SEQ_TB or
field == V4L2_FIELD_SEQ_BT)
def V4L2_FIELD_HAS_BOTH(field):
return (
field == V4L2_FIELD_INTERLACED or
field == V4L2_FIELD_INTERLACED_TB or
field == V4L2_FIELD_INTERLACED_BT or
field == V4L2_FIELD_SEQ_TB or
field == V4L2_FIELD_SEQ_BT)
v4l2_buf_type = enum
(
V4L2_BUF_TYPE_VIDEO_CAPTURE,
V4L2_BUF_TYPE_VIDEO_OUTPUT,
V4L2_BUF_TYPE_VIDEO_OVERLAY,
V4L2_BUF_TYPE_VBI_CAPTURE,
V4L2_BUF_TYPE_VBI_OUTPUT,
V4L2_BUF_TYPE_SLICED_VBI_CAPTURE,
V4L2_BUF_TYPE_SLICED_VBI_OUTPUT,
V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY,
V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
V4L2_BUF_TYPE_SDR_CAPTURE,
V4L2_BUF_TYPE_SDR_OUTPUT,
V4L2_BUF_TYPE_META_CAPTURE,
V4L2_BUF_TYPE_META_OUTPUT,
V4L2_BUF_TYPE_PRIVATE,
) = list(range(1, 15)) + [0x80]
v4l2_ctrl_type = enum
(
V4L2_CTRL_TYPE_INTEGER,
V4L2_CTRL_TYPE_BOOLEAN,
V4L2_CTRL_TYPE_MENU,
V4L2_CTRL_TYPE_BUTTON,
V4L2_CTRL_TYPE_INTEGER64,
V4L2_CTRL_TYPE_CTRL_CLASS,
V4L2_CTRL_TYPE_STRING,
V4L2_CTRL_TYPE_BITMASK,
V4L2_CTRL_TYPE_INTEGER_MENU,
) = range(1, 10)
v4l2_tuner_type = enum
(
V4L2_TUNER_RADIO,
V4L2_TUNER_ANALOG_TV,
V4L2_TUNER_DIGITAL_TV,
) = range(1, 4)
v4l2_memory = enum
(
V4L2_MEMORY_MMAP,
V4L2_MEMORY_USERPTR,
V4L2_MEMORY_OVERLAY,
V4L2_MEMORY_DMABUF,
) = range(1, 5)
v4l2_colorspace = enum
(
V4L2_COLORSPACE_DEFAULT,
V4L2_COLORSPACE_SMPTE170M,
V4L2_COLORSPACE_SMPTE240M,
V4L2_COLORSPACE_REC709,
V4L2_COLORSPACE_BT878,
V4L2_COLORSPACE_470_SYSTEM_M,
V4L2_COLORSPACE_470_SYSTEM_BG,
V4L2_COLORSPACE_JPEG,
V4L2_COLORSPACE_SRGB,
V4L2_COLORSPACE_OPRGB,
V4L2_COLORSPACE_BT2020,
V4L2_COLORSPACE_RAW,
V4L2_COLORSPACE_DCI_P3,
) = range(13)
v4l2_priority = enum
(
V4L2_PRIORITY_UNSET,
V4L2_PRIORITY_BACKGROUND,
V4L2_PRIORITY_INTERACTIVE,
V4L2_PRIORITY_RECORD,
V4L2_PRIORITY_DEFAULT,
) = list(range(0, 4)) + [2]
class v4l2_rect(ctypes.Structure):
_fields_ = [
('left', ctypes.c_int32),
('top', ctypes.c_int32),
('width', ctypes.c_int32),
('height', ctypes.c_int32),
]
class v4l2_fract(ctypes.Structure):
_fields_ = [
('numerator', ctypes.c_uint32),
('denominator', ctypes.c_uint32),
]
#
# Driver capabilities
#
class v4l2_capability(ctypes.Structure):
_fields_ = [
('driver', ctypes.c_char * 16),
('card', ctypes.c_char * 32),
('bus_info', ctypes.c_char * 32),
('version', ctypes.c_uint32),
('capabilities', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 4),
]
#
# Values for 'capabilities' field
#
V4L2_CAP_VIDEO_CAPTURE = 0x00000001
V4L2_CAP_VIDEO_OUTPUT = 0x00000002
V4L2_CAP_VIDEO_OVERLAY = 0x00000004
V4L2_CAP_VBI_CAPTURE = 0x00000010
V4L2_CAP_VBI_OUTPUT = 0x00000020
V4L2_CAP_SLICED_VBI_CAPTURE = 0x00000040
V4L2_CAP_SLICED_VBI_OUTPUT = 0x00000080
V4L2_CAP_RDS_CAPTURE = 0x00000100
V4L2_CAP_VIDEO_OUTPUT_OVERLAY = 0x00000200
V4L2_CAP_HW_FREQ_SEEK = 0x00000400
V4L2_CAP_RDS_OUTPUT = 0x00000800
V4L2_CAP_TUNER = 0x00010000
V4L2_CAP_AUDIO = 0x00020000
V4L2_CAP_RADIO = 0x00040000
V4L2_CAP_MODULATOR = 0x00080000
V4L2_CAP_READWRITE = 0x01000000
V4L2_CAP_ASYNCIO = 0x02000000
V4L2_CAP_STREAMING = 0x04000000
#
# Video image format
#
class v4l2_pix_format(ctypes.Structure):
_fields_ = [
('width', ctypes.c_uint32),
('height', ctypes.c_uint32),
('pixelformat', ctypes.c_uint32),
('field', v4l2_field),
('bytesperline', ctypes.c_uint32),
('sizeimage', ctypes.c_uint32),
('colorspace', v4l2_colorspace),
('priv', ctypes.c_uint32),
]
class v4l2_plane_pix_format(ctypes.Structure):
_fields_ = [
('sizeimage', ctypes.c_uint32),
('bytesperline', ctypes.c_uint32),
('reserved', ctypes.c_uint16 * 6),
]
_pack_ = True
class v4l2_pix_format_mplane(ctypes.Structure):
class _u(ctypes.Union):
_fields_ = [
('ycbcr_enc', ctypes.c_uint8),
('hsv_enc', ctypes.c_uint8),
]
_fields_ = [
('width', ctypes.c_uint32),
('height', ctypes.c_uint32),
('pixelformat', ctypes.c_uint32),
('field', v4l2_field),
('colorspace', v4l2_colorspace),
('plane_fmt', v4l2_plane_pix_format * VIDEO_MAX_PLANES),
('num_planes', ctypes.c_uint8),
('flags', ctypes.c_uint8),
('_u', _u),
('quantization', ctypes.c_uint8),
('xfer_func', ctypes.c_uint8),
('reserved', ctypes.c_uint8 * 7),
]
_anonymous_ = ('_u',)
_pack_ = True
# RGB formats
V4L2_PIX_FMT_RGB332 = v4l2_fourcc('R', 'G', 'B', '1')
V4L2_PIX_FMT_RGB444 = v4l2_fourcc('R', '4', '4', '4')
V4L2_PIX_FMT_RGB555 = v4l2_fourcc('R', 'G', 'B', 'O')
V4L2_PIX_FMT_RGB565 = v4l2_fourcc('R', 'G', 'B', 'P')
V4L2_PIX_FMT_RGB555X = v4l2_fourcc('R', 'G', 'B', 'Q')
V4L2_PIX_FMT_RGB565X = v4l2_fourcc('R', 'G', 'B', 'R')
V4L2_PIX_FMT_BGR24 = v4l2_fourcc('B', 'G', 'R', '3')
V4L2_PIX_FMT_RGB24 = v4l2_fourcc('R', 'G', 'B', '3')
V4L2_PIX_FMT_BGR32 = v4l2_fourcc('B', 'G', 'R', '4')
V4L2_PIX_FMT_RGB32 = v4l2_fourcc('R', 'G', 'B', '4')
# Grey formats
V4L2_PIX_FMT_GREY = v4l2_fourcc('G', 'R', 'E', 'Y')
V4L2_PIX_FMT_Y10 = v4l2_fourcc('Y', '1', '0', ' ')
V4L2_PIX_FMT_Y16 = v4l2_fourcc('Y', '1', '6', ' ')
# Palette formats
V4L2_PIX_FMT_PAL8 = v4l2_fourcc('P', 'A', 'L', '8')
# Luminance+Chrominance formats
V4L2_PIX_FMT_YVU410 = v4l2_fourcc('Y', 'V', 'U', '9')
V4L2_PIX_FMT_YVU420 = v4l2_fourcc('Y', 'V', '1', '2')
V4L2_PIX_FMT_YUYV = v4l2_fourcc('Y', 'U', 'Y', 'V')
V4L2_PIX_FMT_YYUV = v4l2_fourcc('Y', 'Y', 'U', 'V')
V4L2_PIX_FMT_YVYU = v4l2_fourcc('Y', 'V', 'Y', 'U')
V4L2_PIX_FMT_UYVY = v4l2_fourcc('U', 'Y', 'V', 'Y')
V4L2_PIX_FMT_VYUY = v4l2_fourcc('V', 'Y', 'U', 'Y')
V4L2_PIX_FMT_YUV422P = v4l2_fourcc('4', '2', '2', 'P')
V4L2_PIX_FMT_YUV411P = v4l2_fourcc('4', '1', '1', 'P')
V4L2_PIX_FMT_Y41P = v4l2_fourcc('Y', '4', '1', 'P')
V4L2_PIX_FMT_YUV444 = v4l2_fourcc('Y', '4', '4', '4')
V4L2_PIX_FMT_YUV555 = v4l2_fourcc('Y', 'U', 'V', 'O')
V4L2_PIX_FMT_YUV565 = v4l2_fourcc('Y', 'U', 'V', 'P')
V4L2_PIX_FMT_YUV32 = v4l2_fourcc('Y', 'U', 'V', '4')
V4L2_PIX_FMT_YUV410 = v4l2_fourcc('Y', 'U', 'V', '9')
V4L2_PIX_FMT_YUV420 = v4l2_fourcc('Y', 'U', '1', '2')
V4L2_PIX_FMT_HI240 = v4l2_fourcc('H', 'I', '2', '4')
V4L2_PIX_FMT_HM12 = v4l2_fourcc('H', 'M', '1', '2')
# two planes -- one Y, one Cr + Cb interleaved
V4L2_PIX_FMT_NV12 = v4l2_fourcc('N', 'V', '1', '2')
V4L2_PIX_FMT_NV21 = v4l2_fourcc('N', 'V', '2', '1')
V4L2_PIX_FMT_NV16 = v4l2_fourcc('N', 'V', '1', '6')
V4L2_PIX_FMT_NV61 = v4l2_fourcc('N', 'V', '6', '1')
# Bayer formats - see http://www.siliconimaging.com/RGB%20Bayer.htm
V4L2_PIX_FMT_SBGGR8 = v4l2_fourcc('B', 'A', '8', '1')
V4L2_PIX_FMT_SGBRG8 = v4l2_fourcc('G', 'B', 'R', 'G')
V4L2_PIX_FMT_SGRBG8 = v4l2_fourcc('G', 'R', 'B', 'G')
V4L2_PIX_FMT_SRGGB8 = v4l2_fourcc('R', 'G', 'G', 'B')
V4L2_PIX_FMT_SBGGR10 = v4l2_fourcc('B', 'G', '1', '0')
V4L2_PIX_FMT_SGBRG10 = v4l2_fourcc('G', 'B', '1', '0')
V4L2_PIX_FMT_SGRBG10 = v4l2_fourcc('B', 'A', '1', '0')
V4L2_PIX_FMT_SRGGB10 = v4l2_fourcc('R', 'G', '1', '0')
V4L2_PIX_FMT_SGRBG10DPCM8 = v4l2_fourcc('B', 'D', '1', '0')
V4L2_PIX_FMT_SBGGR16 = v4l2_fourcc('B', 'Y', 'R', '2')
# compressed formats
V4L2_PIX_FMT_MJPEG = v4l2_fourcc('M', 'J', 'P', 'G')
V4L2_PIX_FMT_JPEG = v4l2_fourcc('J', 'P', 'E', 'G')
V4L2_PIX_FMT_DV = v4l2_fourcc('d', 'v', 's', 'd')
V4L2_PIX_FMT_MPEG = v4l2_fourcc('M', 'P', 'E', 'G')
V4L2_PIX_FMT_H264 = v4l2_fourcc('H', '2', '6', '4')
# Vendor-specific formats
V4L2_PIX_FMT_CPIA1 = v4l2_fourcc('C', 'P', 'I', 'A')
V4L2_PIX_FMT_WNVA = v4l2_fourcc('W', 'N', 'V', 'A')
V4L2_PIX_FMT_SN9C10X = v4l2_fourcc('S', '9', '1', '0')
V4L2_PIX_FMT_SN9C20X_I420 = v4l2_fourcc('S', '9', '2', '0')
V4L2_PIX_FMT_PWC1 = v4l2_fourcc('P', 'W', 'C', '1')
V4L2_PIX_FMT_PWC2 = v4l2_fourcc('P', 'W', 'C', '2')
V4L2_PIX_FMT_ET61X251 = v4l2_fourcc('E', '6', '2', '5')
V4L2_PIX_FMT_SPCA501 = v4l2_fourcc('S', '5', '0', '1')
V4L2_PIX_FMT_SPCA505 = v4l2_fourcc('S', '5', '0', '5')
V4L2_PIX_FMT_SPCA508 = v4l2_fourcc('S', '5', '0', '8')
V4L2_PIX_FMT_SPCA561 = v4l2_fourcc('S', '5', '6', '1')
V4L2_PIX_FMT_PAC207 = v4l2_fourcc('P', '2', '0', '7')
V4L2_PIX_FMT_MR97310A = v4l2_fourcc('M', '3', '1', '0')
V4L2_PIX_FMT_SN9C2028 = v4l2_fourcc('S', 'O', 'N', 'X')
V4L2_PIX_FMT_SQ905C = v4l2_fourcc('9', '0', '5', 'C')
V4L2_PIX_FMT_PJPG = v4l2_fourcc('P', 'J', 'P', 'G')
V4L2_PIX_FMT_OV511 = v4l2_fourcc('O', '5', '1', '1')
V4L2_PIX_FMT_OV518 = v4l2_fourcc('O', '5', '1', '8')
V4L2_PIX_FMT_STV0680 = v4l2_fourcc('S', '6', '8', '0')
#
# Format enumeration
#
class v4l2_fmtdesc(ctypes.Structure):
_fields_ = [
('index', ctypes.c_uint32),
('type', ctypes.c_int),
('flags', ctypes.c_uint32),
('description', ctypes.c_char * 32),
('pixelformat', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 4),
]
V4L2_FMT_FLAG_COMPRESSED = 0x0001
V4L2_FMT_FLAG_EMULATED = 0x0002
#
# Experimental frame size and frame rate enumeration
#
v4l2_frmsizetypes = enum
(
V4L2_FRMSIZE_TYPE_DISCRETE,
V4L2_FRMSIZE_TYPE_CONTINUOUS,
V4L2_FRMSIZE_TYPE_STEPWISE,
) = range(1, 4)
class v4l2_frmsize_discrete(ctypes.Structure):
_fields_ = [
('width', ctypes.c_uint32),
('height', ctypes.c_uint32),
]
class v4l2_frmsize_stepwise(ctypes.Structure):
_fields_ = [
('min_width', ctypes.c_uint32),
('max_width', ctypes.c_uint32),
('step_width', ctypes.c_uint32),
('min_height', ctypes.c_uint32),
('max_height', ctypes.c_uint32),
('step_height', ctypes.c_uint32),
]
class v4l2_frmsizeenum(ctypes.Structure):
class _u(ctypes.Union):
_fields_ = [
('discrete', v4l2_frmsize_discrete),
('stepwise', v4l2_frmsize_stepwise),
]
_fields_ = [
('index', ctypes.c_uint32),
('pixel_format', ctypes.c_uint32),
('type', ctypes.c_uint32),
('_u', _u),
('reserved', ctypes.c_uint32 * 2)
]
_anonymous_ = ('_u',)
#
# Frame rate enumeration
#
v4l2_frmivaltypes = enum
(
V4L2_FRMIVAL_TYPE_DISCRETE,
V4L2_FRMIVAL_TYPE_CONTINUOUS,
V4L2_FRMIVAL_TYPE_STEPWISE,
) = range(1, 4)
class v4l2_frmival_stepwise(ctypes.Structure):
_fields_ = [
('min', v4l2_fract),
('max', v4l2_fract),
('step', v4l2_fract),
]
class v4l2_frmivalenum(ctypes.Structure):
class _u(ctypes.Union):
_fields_ = [
('discrete', v4l2_fract),
('stepwise', v4l2_frmival_stepwise),
]
_fields_ = [
('index', ctypes.c_uint32),
('pixel_format', ctypes.c_uint32),
('width', ctypes.c_uint32),
('height', ctypes.c_uint32),
('type', ctypes.c_uint32),
('_u', _u),
('reserved', ctypes.c_uint32 * 2),
]
_anonymous_ = ('_u',)
#
# Timecode
#
class v4l2_timecode(ctypes.Structure):
_fields_ = [
('type', ctypes.c_uint32),
('flags', ctypes.c_uint32),
('frames', ctypes.c_uint8),
('seconds', ctypes.c_uint8),
('minutes', ctypes.c_uint8),
('hours', ctypes.c_uint8),
('userbits', ctypes.c_uint8 * 4),
]
V4L2_TC_TYPE_24FPS = 1
V4L2_TC_TYPE_25FPS = 2
V4L2_TC_TYPE_30FPS = 3
V4L2_TC_TYPE_50FPS = 4
V4L2_TC_TYPE_60FPS = 5
V4L2_TC_FLAG_DROPFRAME = 0x0001
V4L2_TC_FLAG_COLORFRAME = 0x0002
V4L2_TC_USERBITS_field = 0x000C
V4L2_TC_USERBITS_USERDEFINED = 0x0000
V4L2_TC_USERBITS_8BITCHARS = 0x0008
class v4l2_jpegcompression(ctypes.Structure):
_fields_ = [
('quality', ctypes.c_int),
('APPn', ctypes.c_int),
('APP_len', ctypes.c_int),
('APP_data', ctypes.c_char * 60),
('COM_len', ctypes.c_int),
('COM_data', ctypes.c_char * 60),
('jpeg_markers', ctypes.c_uint32),
]
V4L2_JPEG_MARKER_DHT = 1 << 3
V4L2_JPEG_MARKER_DQT = 1 << 4
V4L2_JPEG_MARKER_DRI = 1 << 5
V4L2_JPEG_MARKER_COM = 1 << 6
V4L2_JPEG_MARKER_APP = 1 << 7
#
# Memory-mapping buffers
#
class v4l2_requestbuffers(ctypes.Structure):
_fields_ = [
('count', ctypes.c_uint32),
('type', v4l2_buf_type),
('memory', v4l2_memory),
('reserved', ctypes.c_uint32 * 2),
]
class v4l2_exportbuffer(ctypes.Structure):
_fields_ = [
('type', v4l2_buf_type),
('index', ctypes.c_uint32),
('plane', ctypes.c_uint32),
('flags', ctypes.c_uint32),
('fd', ctypes.c_int32),
('reserved', ctypes.c_uint32 * 11),
]
class v4l2_plane(ctypes.Structure):
class _u(ctypes.Union):
_fields_ = [
('mem_offset', ctypes.c_uint32),
('userptr', ctypes.c_ulong),
('fd', ctypes.c_int32),
]
_fields_ = [
('bytesused', ctypes.c_uint32),
('length', ctypes.c_uint32),
('m', _u),
('data_offset', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 11),
]
v4l2_planes = v4l2_plane * VIDEO_MAX_PLANES
class v4l2_buffer(ctypes.Structure):
class _u(ctypes.Union):
_fields_ = [
('offset', ctypes.c_uint32),
('userptr', ctypes.c_ulong),
('planes', ctypes.POINTER(v4l2_plane)),
('fd', ctypes.c_int32),
]
_fields_ = [
('index', ctypes.c_uint32),
('type', v4l2_buf_type),
('bytesused', ctypes.c_uint32),
('flags', ctypes.c_uint32),
('field', v4l2_field),
('timestamp', timeval),
('timecode', v4l2_timecode),
('sequence', ctypes.c_uint32),
('memory', v4l2_memory),
('m', _u),
('length', ctypes.c_uint32),
('input', ctypes.c_uint32),
('reserved', ctypes.c_uint32),
]
V4L2_BUF_FLAG_MAPPED = 0x0001
V4L2_BUF_FLAG_QUEUED = 0x0002
V4L2_BUF_FLAG_DONE = 0x0004
V4L2_BUF_FLAG_KEYFRAME = 0x0008
V4L2_BUF_FLAG_PFRAME = 0x0010
V4L2_BUF_FLAG_BFRAME = 0x0020
V4L2_BUF_FLAG_ERROR = 0x0040
V4L2_BUF_FLAG_TIMECODE = 0x0100
V4L2_BUF_FLAG_INPUT = 0x0200
#
# Overlay preview
#
class v4l2_framebuffer(ctypes.Structure):
_fields_ = [
('capability', ctypes.c_uint32),
('flags', ctypes.c_uint32),
('base', ctypes.c_void_p),
('fmt', v4l2_pix_format),
]
V4L2_FBUF_CAP_EXTERNOVERLAY = 0x0001
V4L2_FBUF_CAP_CHROMAKEY = 0x0002
V4L2_FBUF_CAP_LIST_CLIPPING = 0x0004
V4L2_FBUF_CAP_BITMAP_CLIPPING = 0x0008
V4L2_FBUF_CAP_LOCAL_ALPHA = 0x0010
V4L2_FBUF_CAP_GLOBAL_ALPHA = 0x0020
V4L2_FBUF_CAP_LOCAL_INV_ALPHA = 0x0040
V4L2_FBUF_CAP_SRC_CHROMAKEY = 0x0080
V4L2_FBUF_FLAG_PRIMARY = 0x0001
V4L2_FBUF_FLAG_OVERLAY = 0x0002
V4L2_FBUF_FLAG_CHROMAKEY = 0x0004
V4L2_FBUF_FLAG_LOCAL_ALPHA = 0x0008
V4L2_FBUF_FLAG_GLOBAL_ALPHA = 0x0010
V4L2_FBUF_FLAG_LOCAL_INV_ALPHA = 0x0020
V4L2_FBUF_FLAG_SRC_CHROMAKEY = 0x0040
class v4l2_clip(ctypes.Structure):
pass
v4l2_clip._fields_ = [
('c', v4l2_rect),
('next', ctypes.POINTER(v4l2_clip)),
]
class v4l2_window(ctypes.Structure):
_fields_ = [
('w', v4l2_rect),
('field', v4l2_field),
('chromakey', ctypes.c_uint32),
('clips', ctypes.POINTER(v4l2_clip)),
('clipcount', ctypes.c_uint32),
('bitmap', ctypes.c_void_p),
('global_alpha', ctypes.c_uint8),
]
#
# Capture parameters
#
class v4l2_captureparm(ctypes.Structure):
_fields_ = [
('capability', ctypes.c_uint32),
('capturemode', ctypes.c_uint32),
('timeperframe', v4l2_fract),
('extendedmode', ctypes.c_uint32),
('readbuffers', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 4),
]
V4L2_MODE_HIGHQUALITY = 0x0001
V4L2_CAP_TIMEPERFRAME = 0x1000
class v4l2_outputparm(ctypes.Structure):
_fields_ = [
('capability', ctypes.c_uint32),
('outputmode', ctypes.c_uint32),
('timeperframe', v4l2_fract),
('extendedmode', ctypes.c_uint32),
('writebuffers', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 4),
]
#
# Input image cropping
#
class v4l2_cropcap(ctypes.Structure):
_fields_ = [
('type', v4l2_buf_type),
('bounds', v4l2_rect),
('defrect', v4l2_rect),
('pixelaspect', v4l2_fract),
]
class v4l2_crop(ctypes.Structure):
_fields_ = [
('type', ctypes.c_int),
('c', v4l2_rect),
]
class v4l2_selection(ctypes.Structure):
_fields_ = [
('type', ctypes.c_uint32),
('target', ctypes.c_uint32),
('flags', ctypes.c_uint32),
('r', v4l2_rect),
('reserverd', ctypes.c_uint32 * 9),
]
V4L2_SEL_TGT_CROP = 0x0000
V4L2_SEL_TGT_CROP_DEFAULT = 0x0001
V4L2_SEL_TGT_CROP_BOUNDS = 0x0002
V4L2_SEL_TGT_NATIVE_SIZE = 0x0003
V4L2_SEL_TGT_COMPOSE = 0x0100
V4L2_SEL_TGT_COMPOSE_DEFAULT = 0x0101
V4L2_SEL_TGT_COMPOSE_BOUNDS = 0x0102
V4L2_SEL_TGT_COMPOSE_PADDED = 0x0103
V4L2_SEL_FLAG_GE = (1 << 0)
V4L2_SEL_FLAG_LE = (1 << 1)
V4L2_SEL_FLAG_KEEP_CONFIG = (1 << 2)
#
# Analog video standard
#
v4l2_std_id = ctypes.c_uint64
V4L2_STD_PAL_B = 0x00000001
V4L2_STD_PAL_B1 = 0x00000002
V4L2_STD_PAL_G = 0x00000004
V4L2_STD_PAL_H = 0x00000008
V4L2_STD_PAL_I = 0x00000010
V4L2_STD_PAL_D = 0x00000020
V4L2_STD_PAL_D1 = 0x00000040
V4L2_STD_PAL_K = 0x00000080
V4L2_STD_PAL_M = 0x00000100
V4L2_STD_PAL_N = 0x00000200
V4L2_STD_PAL_Nc = 0x00000400
V4L2_STD_PAL_60 = 0x00000800
V4L2_STD_NTSC_M = 0x00001000
V4L2_STD_NTSC_M_JP = 0x00002000
V4L2_STD_NTSC_443 = 0x00004000
V4L2_STD_NTSC_M_KR = 0x00008000
V4L2_STD_SECAM_B = 0x00010000
V4L2_STD_SECAM_D = 0x00020000
V4L2_STD_SECAM_G = 0x00040000
V4L2_STD_SECAM_H = 0x00080000
V4L2_STD_SECAM_K = 0x00100000
V4L2_STD_SECAM_K1 = 0x00200000
V4L2_STD_SECAM_L = 0x00400000
V4L2_STD_SECAM_LC = 0x00800000
V4L2_STD_ATSC_8_VSB = 0x01000000
V4L2_STD_ATSC_16_VSB = 0x02000000
# some common needed stuff
V4L2_STD_PAL_BG = (V4L2_STD_PAL_B | V4L2_STD_PAL_B1 | V4L2_STD_PAL_G)
V4L2_STD_PAL_DK = (V4L2_STD_PAL_D | V4L2_STD_PAL_D1 | V4L2_STD_PAL_K)
V4L2_STD_PAL = (V4L2_STD_PAL_BG | V4L2_STD_PAL_DK | V4L2_STD_PAL_H | V4L2_STD_PAL_I)
V4L2_STD_NTSC = (V4L2_STD_NTSC_M | V4L2_STD_NTSC_M_JP | V4L2_STD_NTSC_M_KR)
V4L2_STD_SECAM_DK = (V4L2_STD_SECAM_D | V4L2_STD_SECAM_K | V4L2_STD_SECAM_K1)
V4L2_STD_SECAM = (V4L2_STD_SECAM_B | V4L2_STD_SECAM_G | V4L2_STD_SECAM_H | V4L2_STD_SECAM_DK | V4L2_STD_SECAM_L | V4L2_STD_SECAM_LC)
V4L2_STD_525_60 = (V4L2_STD_PAL_M | V4L2_STD_PAL_60 | V4L2_STD_NTSC | V4L2_STD_NTSC_443)
V4L2_STD_625_50 = (V4L2_STD_PAL | V4L2_STD_PAL_N | V4L2_STD_PAL_Nc | V4L2_STD_SECAM)
V4L2_STD_ATSC = (V4L2_STD_ATSC_8_VSB | V4L2_STD_ATSC_16_VSB)
V4L2_STD_UNKNOWN = 0
V4L2_STD_ALL = (V4L2_STD_525_60 | V4L2_STD_625_50)
# some merged standards
V4L2_STD_MN = (V4L2_STD_PAL_M | V4L2_STD_PAL_N | V4L2_STD_PAL_Nc | V4L2_STD_NTSC)
V4L2_STD_B = (V4L2_STD_PAL_B | V4L2_STD_PAL_B1 | V4L2_STD_SECAM_B)
V4L2_STD_GH = (V4L2_STD_PAL_G | V4L2_STD_PAL_H|V4L2_STD_SECAM_G | V4L2_STD_SECAM_H)
V4L2_STD_DK = (V4L2_STD_PAL_DK | V4L2_STD_SECAM_DK)
class v4l2_standard(ctypes.Structure):
_fields_ = [
('index', ctypes.c_uint32),
('id', v4l2_std_id),
('name', ctypes.c_char * 24),
('frameperiod', v4l2_fract),
('framelines', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 4),
]
#
# Video timings dv preset
#
class v4l2_dv_preset(ctypes.Structure):
_fields_ = [
('preset', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 4)
]
#
# DV preset enumeration
#
class v4l2_dv_enum_preset(ctypes.Structure):
_fields_ = [
('index', ctypes.c_uint32),
('preset', ctypes.c_uint32),
('name', ctypes.c_char * 32),
('width', ctypes.c_uint32),
('height', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 4),
]
#
# DV preset values
#
V4L2_DV_INVALID = 0
V4L2_DV_480P59_94 = 1
V4L2_DV_576P50 = 2
V4L2_DV_720P24 = 3
V4L2_DV_720P25 = 4
V4L2_DV_720P30 = 5
V4L2_DV_720P50 = 6
V4L2_DV_720P59_94 = 7
V4L2_DV_720P60 = 8
V4L2_DV_1080I29_97 = 9
V4L2_DV_1080I30 = 10
V4L2_DV_1080I25 = 11
V4L2_DV_1080I50 = 12
V4L2_DV_1080I60 = 13
V4L2_DV_1080P24 = 14
V4L2_DV_1080P25 = 15
V4L2_DV_1080P30 = 16
V4L2_DV_1080P50 = 17
V4L2_DV_1080P60 = 18
#
# DV BT timings
#
class v4l2_bt_timings(ctypes.Structure):
_fields_ = [
('width', ctypes.c_uint32),
('height', ctypes.c_uint32),
('interlaced', ctypes.c_uint32),
('polarities', ctypes.c_uint32),
('pixelclock', ctypes.c_uint64),
('hfrontporch', ctypes.c_uint32),
('hsync', ctypes.c_uint32),
('hbackporch', ctypes.c_uint32),
('vfrontporch', ctypes.c_uint32),
('vsync', ctypes.c_uint32),
('vbackporch', ctypes.c_uint32),
('il_vfrontporch', ctypes.c_uint32),
('il_vsync', ctypes.c_uint32),
('il_vbackporch', ctypes.c_uint32),
('reserved', ctypes.c_uint32 * 16),
]
_pack_ = True
# Interlaced or progressive format
V4L2_DV_PROGRESSIVE = 0
V4L2_DV_INTERLACED = 1
# Polarities. If bit is not set, it is assumed to be negative polarity
V4L2_DV_VSYNC_POS_POL = 0x00000001
V4L2_DV_HSYNC_POS_POL = 0x00000002
class v4l2_dv_timings(ctypes.Structure):
class _u(ctypes.Union):
_fields_ = [
('bt', v4l2_bt_timings),
('reserved', ctypes.c_uint32 * 32),
]
_fields_ = [
('type', ctypes.c_uint32),
('_u', _u),
]
_anonymous_ = ('_u',)
_pack_ = True
# Values for the type field
V4L2_DV_BT_656_1120 = 0