Refactor all video related processing to its own class

tools/telemetry/telemetry/core/video_unittest.py

+# 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 logging
+import os
+import unittest
+
+from telemetry import test
+from telemetry.core import bitmap
+from telemetry.core import util
+from telemetry.core import video
+from telemetry.core.platform import android_platform_backend
+from telemetry.unittest import system_stub
+
+class MockAdbCommands(object):
+  def CanAccessProtectedFileContents(self):
+    return True
+
+class MockDevice(object):
+  def __init__(self, mock_adb_commands):
+    self.old_interface = mock_adb_commands
+
+class VideoTest(unittest.TestCase) :
+  def setUp(self):
+    self._stubs = system_stub.Override(android_platform_backend,
+                                       ['perf_control', 'thermal_throttle'])
+
+  def tearDown(self):
+    self._stubs.Restore()
+
+  @test.Disabled
+  def testFramesFromMp4(self):
+    mock_adb = MockDevice(MockAdbCommands())
+    backend = android_platform_backend.AndroidPlatformBackend(mock_adb, False)
+
+    try:
+      backend.InstallApplication('avconv')
+    finally:
+      if not backend.CanLaunchApplication('avconv'):
+        logging.warning('Test not supported on this platform')
+        return  # pylint: disable=W0150
+
+    vid = os.path.join(util.GetUnittestDataDir(), 'vid.mp4')
+    expected_timestamps = [
+      0,
+      763,
+      783,
+      940,
+      1715,
+      1732,
+      1842,
+      1926,
+      ]
+
+    video_obj = video.Video(backend, vid)
+
+    # Calling _FramesFromMp4 should return all frames.
+    # pylint: disable=W0212
+    for i, timestamp_bitmap in enumerate(video_obj._FramesFromMp4(vid)):
+      timestamp, bmp = timestamp_bitmap
+      self.assertEquals(timestamp, expected_timestamps[i])
+      expected_bitmap = bitmap.Bitmap.FromPngFile(os.path.join(
+          util.GetUnittestDataDir(), 'frame%d.png' % i))
+      self.assertTrue(expected_bitmap.IsEqual(bmp))