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# Copyright 2013 The Chromium 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 os
import tempfile
from pylib import cmd_helper
# TODO(jbudorick) Remove once telemetry gets switched over.
import pylib.android_commands
import pylib.device.device_utils
class VideoRecorder(object):
"""Records a screen capture video from an Android Device (KitKat or newer).
Args:
device: DeviceUtils instance.
host_file: Path to the video file to store on the host.
megabits_per_second: Video bitrate in megabits per second. Allowed range
from 0.1 to 100 mbps.
size: Video frame size tuple (width, height) or None to use the device
default.
rotate: If True, the video will be rotated 90 degrees.
"""
def __init__(self, device, host_file, megabits_per_second=4, size=None,
rotate=False):
# TODO(jbudorick) Remove once telemetry gets switched over.
if isinstance(device, pylib.android_commands.AndroidCommands):
device = pylib.device.device_utils.DeviceUtils(device)
self._device = device
self._device_file = (
'%s/screen-recording.mp4' % device.GetExternalStoragePath())
self._host_file = host_file or ('screen-recording-%s.mp4' %
device.old_interface.GetTimestamp())
self._host_file = os.path.abspath(self._host_file)
self._recorder = None
self._recorder_pids = None
self._recorder_stdout = None
self._is_started = False
self._args = ['adb']
if self._device.old_interface.GetDevice():
self._args += ['-s', self._device.old_interface.GetDevice()]
self._args += ['shell', 'screenrecord', '--verbose']
self._args += ['--bit-rate', str(megabits_per_second * 1000 * 1000)]
if size:
self._args += ['--size', '%dx%d' % size]
if rotate:
self._args += ['--rotate']
self._args += [self._device_file]
def Start(self):
"""Start recording video."""
self._device.old_interface.EnsureHostDirectory(self._host_file)
self._recorder_stdout = tempfile.mkstemp()[1]
self._recorder = cmd_helper.Popen(
self._args, stdout=open(self._recorder_stdout, 'w'))
self._recorder_pids = self._device.old_interface.ExtractPid('screenrecord')
if not self._recorder_pids:
raise RuntimeError('Recording failed. Is your device running Android '
'KitKat or later?')
def IsStarted(self):
if not self._is_started:
for line in open(self._recorder_stdout):
self._is_started = line.startswith('Content area is ')
if self._is_started:
break
return self._is_started
def Stop(self):
"""Stop recording video."""
os.remove(self._recorder_stdout)
self._is_started = False
if not self._recorder or not self._recorder_pids:
return
self._device.RunShellCommand(
'kill -SIGINT ' + ' '.join(self._recorder_pids))
self._recorder.wait()
def Pull(self):
"""Pull resulting video file from the device.
Returns:
Output video file name on the host.
"""
self._device.old_interface.PullFileFromDevice(
self._device_file, self._host_file)
self._device.RunShellCommand('rm -f "%s"' % self._device_file)
return self._host_file
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