/usr/share/pyshared/freevo/helpers/vg.py is in python-freevo 1.9.2b2-4.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# -----------------------------------------------------------------------
# Find video groups from Analog TV video devices
# -----------------------------------------------------------------------
# $Id: vg.py 11348 2009-03-14 17:26:22Z duncan $
#
# Notes:
# This module can be run under both python and freevo, only freevo mode
# will generate the video groups
# to run under python type:
# python /path/to/vg.py --help (normally src/helpers/vg.py)
# to run under freevo type:
# freevo vg -- --help
#
# Todo:
# Add DVB devices (someone with DVB card needs to do this)
# Add more analogue devices
#
# -----------------------------------------------------------------------
# Freevo - A Home Theater PC framework
# Copyright (C) 2002 Krister Lagerstrom, et al.
# Please see the file freevo/Docs/CREDITS for a complete list of authors.
#
# 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 MER-
# CHANTABILITY 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
#
# -----------------------------------------------------------------------
#
import sys, os, glob, re, copy
from optparse import OptionParser
try:
import config
from config import VideoGroup
import tv.v4l2
freevo = True
except ImportError:
freevo = False
class Options(object):
def __init__(self):
(self.options, self.args) = self.parse()
if freevo and self.options.write:
try:
self.config_file = open(self.options.config, 'a')
except IOError, why:
print 'Cannot open %r: %s' % (self.options.config, why)
sys.exit(1)
else:
self.config_file = sys.stdout
def parse(self):
if freevo:
self.config_filename = config.overridefile
else:
self.config_filename = 'stdout'
parser = OptionParser(conflict_handler='resolve', usage="""
Scan the video devices to set-up the video groups
This only works for analogue devices
Usage: %prog [options]""", version='%prog 1.0')
parser.add_option('-v', '--verbose', action='count', default=0,
help='set the level of verbosity can be set more than once (max 2) [default:%default]')
parser.add_option('-c', '--config', action='store', dest='config', default=self.config_filename,
help='read the configuration from the file given [default:%default]')
parser.add_option('-w', '--write', action='store_true', default=False,
help='update config_file [default:%default]')
parser.add_option('-d', '--debug', action='store_true', default=False,
help='turn on debugging [default:%default]')
return parser.parse_args()
class AnalyseVideo4Linux(object):
def __init__(self, path):
self.path = path
self.devices = []
self.v4l2_devmap = {}
self.v4l2_devices = []
self.pat = re.compile('(\D+)(\d+)')
def cmp_device(self, lhs, rhs):
""" Compare the device names, eg. video1 is less than vbi0 """
types = [ 'video', 'vbi', 'radio' ]
lhs_grp = self.pat.match(lhs).groups()
rhs_grp = self.pat.match(rhs).groups()
lhs_val = types.index(lhs_grp[0]) * 100 + int(lhs_grp[1])
rhs_val = types.index(rhs_grp[0]) * 100 + int(rhs_grp[1])
return lhs_val - rhs_val
def _method1(self, devices):
""" Method 1 search for Xdevice families using contents of modalias """
video4linux_modules = {}
for video4linux_dev in devices[:]:
modalias_file = os.path.join(self.path, video4linux_dev, 'device', 'modalias')
if os.path.exists(modalias_file):
modalias = open(modalias_file).read().strip()
if modalias in video4linux_modules:
video4linux_modules[modalias].append(video4linux_dev)
else:
video4linux_modules[modalias] = [video4linux_dev]
devices.remove(video4linux_dev)
for module in video4linux_modules:
v4l2devs = video4linux_modules[module]
v4l2devs.sort(self.cmp_device)
self.v4l2_devmap[v4l2devs[0]] = v4l2devs
return devices
def _method2(self, devices):
""" Method 2 search for Xdevice families using video4linux:* links """
def cmp_video4linux(self, lhs, rhs):
lhs_dev = lhs.split(':')[1]
rhs_dev = rhs.split(':')[1]
return self.cmp_device(lhs_dev, rhs_dev)
# For each video Xdevice find its family of video devices
video4linux_devmap = {}
for video4linux_dev in devices[:]:
video4linux_file = os.path.join(self.path, video4linux_dev, 'device', 'video4linux:*')
devs = glob.glob(video4linux_file)
if len(devs) > 0 and len(devs[0].split(':')) == 1:
continue
devs.sort(cmp_video4linux)
v4l2devs = []
for dev in devs:
v4l2devs.append(dev.split(':')[1])
if video4linux_dev not in video4linux_devmap:
video4linux_devmap[video4linux_dev] = v4l2devs
devices.remove(video4linux_dev)
# Reduce the family of video devices to one per physical device
video4linux_devices = list(video4linux_devmap)
video4linux_devices.sort(self.cmp_device)
v4l2_devmap = []
for dev in video4linux_devices:
if dev not in v4l2_devmap:
v4l2_devmap += video4linux_devmap[dev]
self.v4l2_devmap[dev] = video4linux_devmap[dev]
return devices
def _analyse(self):
""" Try different methods to determine the video families """
self.devices = os.listdir(self.path)
if options.options.debug:
print 'DEBUG: devices:1:', self.devices
self.devices = self._method1(self.devices)
if options.options.debug:
print 'DEBUG: devices:2:', self.devices
self.devices = self._method2(self.devices)
if options.options.debug:
print 'DEBUG: devices:3:', self.devices
return self.v4l2_devmap
def v4ldevices(self):
""" Get a list of video device families """
self._analyse()
v4l2_devices = list(self.v4l2_devmap)
v4l2_devices.sort(analyser.cmp_device)
self.v4l2_devices = []
for device in v4l2_devices:
self.v4l2_devices.append({'device' : device, 'family' : self.v4l2_devmap[device]})
return self.v4l2_devices
class VideoGroupBuilder(object):
DVB = ('saa7133',)
IVTV = ('ivtv', 'cx88')
TVALSA = ('saa7134',)
WEBCAM = ('pwc',)
NORMAL = ('bttv',)
def __init__(self, devices):
self.devices = devices
self.groups = []
def build(self):
for device in self.devices:
#print device
vdev = os.path.join('/dev', device['device'])
if not os.path.exists(vdev):
print >>sys.stderr, '%r does not exist' % vdev
continue
try:
videodev = tv.v4l2.Videodev(vdev)
except Exception, why:
print >>sys.stderr, why
continue
group_type = 'unknown'
adev = None
if videodev.driver in self.DVB:
group_type = 'dvb'
elif videodev.driver in self.IVTV:
group_type = 'ivtv'
elif videodev.driver in self.TVALSA:
group_type = 'tvalsa'
adev = 'alsa:adevice=hw.1,0:amode=1:audiorate=32000:forceaudio:immediatemode=0'
elif videodev.driver in self.WEBCAM:
group_type = 'webcam'
elif videodev.driver in self.NORMAL:
group_type = 'normal'
else:
print >>sys.stderr, '%r is an unknown driver' % videodev.driver
continue
vvbi = None
for member in device['family']:
if member.startswith('vbi'):
vvbi = os.path.join('/dev', member)
break
desc = 'unknown'
if hasattr(videodev, 'card'):
desc = videodev.card
vg = VideoGroup(desc=desc, group_type=group_type, vdev=vdev, vvbi=vvbi, adev=adev)
self.groups.append(vg)
for value in videodev.enuminputs().values():
if videodev.getinput() == value[0]:
vg.input_num = value[0]
vg.input_type = value[1]
break
else:
if hasattr(videodev, 'inputs'):
for input, values in videodev.inputs.items():
# Asuming the the first device is the tuner
if values[0] == 0:
vg.input_num = values[0]
vg.input_type = values[1]
for value in videodev.enumstds().values():
if videodev.getstd() == value[1]:
vg.tuner_norm = value[2]
break
else:
tv_standard = None
tuner_norm = []
if hasattr(videodev, 'inputs'):
for standard, values in videodev.standards.items():
tuner_norm.append(values[2])
vg.tuner_norm = ','.join(tuner_norm)
vg.tuner_chanlist = 'FixMe'
def write(self):
#for vg in self.groups:
# print vg.__dict__
cf = options.config_file
print >>cf, 'TV_VIDEO_GROUPS = ['
for num in range(len(self.groups)):
vg = self.groups[num]
print >>cf, ' VideoGroup( # %s device, group %s' % (vg.group_type, num)
print >>cf, ' desc=%r,' % vg.desc
print >>cf, ' group_type=%r,' % vg.group_type
print >>cf, ' vdev=%r,' % vg.vdev
print >>cf, ' vvbi=%r,' % vg.vvbi
print >>cf, ' adev=%r,' % vg.adev
print >>cf, ' input_type=%r,' % vg.input_type
print >>cf, ' input_num=%r,' % vg.input_num
print >>cf, ' tuner_norm=%r,' % vg.tuner_norm
print >>cf, ' tuner_chanlist=%r,' % vg.tuner_chanlist
print >>cf, ' record_group=%r' % vg.record_group
print >>cf, ' ),'
print >>cf, ']'
def dump(self):
""" Print out the sorted results and the details """
print
for device in self.devices:
try:
uevent = open(os.path.join(video4linux_path, device['device'], 'uevent')).readlines()
bus = driver = ''
for line in uevent:
if 'PHYSDEVBUS=' in line:
bus = line.split('=')[1].strip()
if 'PHYSDEVDRIVER=' in line:
driver = line.split('=')[1].strip()
print '%s (%s) %s' % (device['device'], bus, driver)
except IOError:
print '%s' % (device['device'],)
print '%s' % ('-' * 41)
for v4ldev in device['family']:
name = open(os.path.join(video4linux_path, v4ldev, 'name')).read().strip()
print '%-8s: %s' % (v4ldev, name)
print '%s' % ('-' * 41)
if freevo and options.options.verbose >= 2:
v = tv.v4l2.Videodev(os.path.join('/dev', device['device']))
v.print_settings()
v.close()
print
if __name__ == '__main__':
options = Options()
# this won't work if procfs is mounted somewhere else
f = open('/proc/mounts')
for line in f.readlines():
fields = line.split()
if fields[2] == 'sysfs':
break
else:
print >>sys.stderr, 'Cannot find mounted sysfs'
sys.exit(1)
sysfs = fields[1]
# Check that there are video4linux devices
video4linux_path = os.path.join(sysfs, 'class', 'video4linux')
if not os.path.isdir(video4linux_path):
print >>sys.stderr, 'Cannot find video4linux in sysfs'
sys.exit(1)
analyser = AnalyseVideo4Linux(video4linux_path)
v4ldevices = analyser.v4ldevices()
if len(analyser.devices) > 0:
print >>sys.stderr, 'Devices not checked'
print >>sys.stderr, '%s' % ('-' * 41)
for device in analyser.devices:
print >>sys.stderr, device
builder = VideoGroupBuilder(v4ldevices)
if not freevo or options.options.verbose >= 1:
builder.dump()
if freevo:
builder.build()
builder.write()
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