test/v4l2_compat/v4l2_compat_test.py


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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, ld_preload, device, base_driver):
    ret, output = run_with_stdout(v4l2_compliance, '-s', '-d', device, env={'LD_PRELOAD': ld_preload})
    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: