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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2020, Google Inc.
#
# Author: Paul Elder <paul.elder@ideasonboard.com>
#
# v4l2_compat_test.py - Test the V4L2 compatibility layer
import argparse
import glob
import os
from packaging import version
import re
import shutil
import signal
import subprocess
import sys
MIN_V4L_UTILS_VERSION = version.parse("1.21.0")
TestPass = 0
TestFail = -1
TestSkip = 77
supported_pipelines = [
'bcm2835-isp',
'uvcvideo',
'vimc',
]
def grep(exp, arr):
return [s for s in arr if re.search(exp, s)]
def run_with_stdout(*args, env={}):
try:
with open(os.devnull, 'w') as devnull:
output = subprocess.check_output(args, env=env, stderr=devnull)
ret = 0
except subprocess.CalledProcessError as err:
output = err.output
ret = err.returncode
return ret, output.decode('utf-8').split('\n')
def extract_result(result):
res = result.split(', ')
ret = {}
ret['total'] = int(res[0].split(': ')[-1])
ret['succeeded'] = int(res[1].split(': ')[-1])
ret['failed'] = int(res[2].split(': ')[-1])
ret['warnings'] = int(res[3].split(': ')[-1])
ret['device'] = res[0].split()[4].strip(':')
ret['driver'] = res[0].split()[2]
return ret
def test_v4l2_compliance(v4l2_compliance, v4l2_compat, device, base_driver):
ret, output = run_with_stdout(v4l2_compliance, '-s', '-d', device, env={'LD_PRELOAD': v4l2_compat})
if ret < 0:
output.append(f'Test for {device} terminated due to signal {signal.Signals(-ret).name}')
return TestFail, output
result = extract_result(output[-2])
if result['failed'] == 0:
return TestPass, output
# vimc will fail s_fmt because it only supports framesizes that are
# multiples of 3
if base_driver == 'vimc' and result['failed'] == 1:
failures = grep('fail', output)
if re.search('S_FMT cannot handle an invalid format', failures[0]) is None:
return TestFail, output
return TestPass, output
return TestFail, output
def main(argv):
parser = argparse.ArgumentParser()
parser.add_argument('-a', '--all', action='store_true',
help='Test all available cameras')
parser.add_argument('-v', '--verbose', action='store_true',
help='Make the output verbose')
parser.add_argument('v4l2_compat', type=str,
help='Path to v4l2-compat.so')
args = parser.parse_args(argv[1:])
v4l2_compat = args.v4l2_compat
v4l2_compliance = shutil.which('v4l2-compliance')
if v4l2_compliance is None:
print('v4l2-compliance is not available')
return TestSkip
ret, out = run_with_stdout(v4l2_compliance, '--version')
if ret != 0 or version.parse(out[0].split()[1].replace(',', '')) < MIN_V4L_UTILS_VERSION:
print('v4l2-compliance version >= 1.21.0 required')
return TestSkip
v4l2_ctl = shutil.which('v4l2-ctl')
if v4l2_ctl is None:
print('v4l2-ctl is not available')
return TestSkip
ret, out = run_with_stdout(v4l2_ctl, '--version')
if ret != 0 or version.parse(out[0].split()[-1]) < MIN_V4L_UTILS_VERSION:
print('v4l2-ctl version >= 1.21.0 required')
return TestSkip
dev_nodes = glob.glob('/dev/video*')
if len(dev_nodes) == 0:
print('no video nodes available to test with')
return TestSkip
failed = []
drivers_tested = {}
for device in dev_nodes:
ret, out = run_with_stdout(v4l2_ctl, '-D', '-d', device, env={'LD_PRELOAD': v4l2_compat})
if ret < 0:
failed.append(device)
print(f'v4l2-ctl failed on {device} with v4l2-compat')
continue
driver = grep('Driver name', out)[0].split(':')[-1].strip()
if driver != "libcamera":
continue
ret, out = run_with_stdout(v4l2_ctl, '-D', '-d', device)
if ret < 0:
failed.append(device)
print(f'v4l2-ctl failed on {device} without v4l2-compat')
continue
driver = grep('Driver name', out)[0].split(':')[-1].strip()
if driver not in supported_pipelines:
continue
# TODO: Add kernel version check when vimc supports scaling
if driver == "vimc":
continue
if not args.all and driver in drivers_tested:
continue
print(f'Testing {device} with {driver} driver... ', end='')
ret, msg = test_v4l2_compliance(v4l2_compliance, v4l2_compat, device, driver)
if ret == TestFail:
failed.append(device)
print('failed')
else:
print('success')
if ret == TestFail or args.verbose:
print('\n'.join(msg))
drivers_tested[driver] = True
if len(drivers_tested) == 0:
print(f'No compatible drivers found')
return TestSkip
if len(failed) > 0:
print(f'Failed {len(failed)} tests:')
for device in failed:
print(f'- {device}')
return TestPass if not failed else TestFail
if __name__ == '__main__':
sys.exit(main(sys.argv))
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