| # Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import glob, os |
| from autotest_lib.client.cros.video import device_capability |
| |
| |
| def find_camera(): |
| """ |
| Find a V4L camera device. |
| |
| @return (device_name, device_index). If no camera is found, (None, None). |
| """ |
| cameras = [os.path.basename(camera) for camera in |
| glob.glob('/sys/bus/usb/drivers/uvcvideo/*/video4linux/video*')] |
| if not cameras: |
| return None, None |
| camera = cameras[0] |
| return camera, int(camera[5:]) |
| |
| |
| def has_builtin_usb_camera(): |
| """Check if there is a built-in USB camera by capability.""" |
| return device_capability.DeviceCapability().have_capability('usb_camera') |
| |
| |
| def get_camera_hal_paths(): |
| """Return the paths of all camera HALs on device.""" |
| return glob.glob('/usr/lib*/camera_hal/*.so') |
| |
| |
| def get_camera_hal_paths_for_test(): |
| """Return the paths of all camera HALs on device for test.""" |
| paths = [] |
| for path in get_camera_hal_paths(): |
| name = os.path.basename(path) |
| # usb.so might be there for external cameras, skip it if there is no |
| # built-in USB camera. |
| if name == 'usb.so' and not has_builtin_usb_camera(): |
| continue |
| paths.append(path) |
| return paths |
