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# Copyright 2014 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 unittest
from telemetry.core import util
from telemetry.internal.image_processing import frame_generator
from telemetry.internal.util import external_modules
try:
cv2 = external_modules.ImportRequiredModule('cv2')
except (ImportError, NotImplementedError):
pass
else:
class VideoFileFrameGeneratorTest(unittest.TestCase):
def __init__(self, *args, **kwargs):
super(VideoFileFrameGeneratorTest, self).__init__(*args, **kwargs)
# Import modules with dependencies that may not be preset in test setup so
# that importing this unit test doesn't cause the test runner to raise an
# exception.
from telemetry.internal.image_processing import video_file_frame_generator
self.VideoFileFrameGenerator = \
video_file_frame_generator.VideoFileFrameGenerator
def testVideoFileFrameGeneratorSuccess(self):
vid = os.path.join(util.GetUnittestDataDir(), 'screen_3_frames.mov')
fg = self.VideoFileFrameGenerator(vid)
timestamps = [0, 33.367, 66.733]
self.assertTrue(isinstance(fg, frame_generator.FrameGenerator))
self.assertEqual(fg.CurrentFrameNumber, -1)
self.assertAlmostEqual(fg.CurrentTimestamp, 0, 3)
self.assertEqual(fg.Dimensions, (432, 320))
generator = fg.Generator
i = 0
for frame in generator:
self.assertEqual(fg.CurrentFrameNumber, i)
self.assertAlmostEqual(fg.CurrentTimestamp, timestamps[i], 3)
self.assertEqual(fg.Dimensions, (432, 320))
self.assertEqual(frame.shape[:2], (320, 432))
i += 1
self.assertEqual(i, 3)
try:
next(generator)
stopped = False
except StopIteration:
stopped = True
self.assertTrue(stopped)
try:
next(fg.Generator)
stopped = False
except StopIteration:
stopped = True
self.assertTrue(stopped)
def testVideoFileFrameGeneratorSkipFrames(self):
vid = os.path.join(util.GetUnittestDataDir(), 'screen_3_frames.mov')
fg = self.VideoFileFrameGenerator(vid, 2)
self.assertEqual(fg.CurrentFrameNumber, 1)
self.assertAlmostEqual(fg.CurrentTimestamp, 33.367, 3)
self.assertEqual(fg.Dimensions, (432, 320))
next(fg.Generator)
try:
next(fg.Generator)
stopped = False
except StopIteration:
stopped = True
self.assertTrue(stopped)
def testVideoFileFrameGeneratorFailure(self):
vid = os.path.join(util.GetUnittestDataDir(), 'screen_3_frames.mov')
try:
self.VideoFileFrameGenerator(vid, 4)
fail = False
except frame_generator.FrameReadError:
fail = True
self.assertTrue(fail)
try:
self.VideoFileFrameGenerator('not_a_file', 0)
fail = False
except frame_generator.FrameReadError:
fail = True
self.assertTrue(fail)
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