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| 1 #!/usr/bin/env python |
| 2 # Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 3 # Use of this source code is governed by a BSD-style license that can be |
| 4 # found in the LICENSE file. |
| 5 |
| 6 """Audio latency performance test. |
| 7 |
| 8 Benchmark measuring how fast we can continuously repeat a short sound clip. In |
| 9 the ideal scenario we'd have zero latency processing script, seeking back to the |
| 10 beginning of the clip, and resuming audio playback. |
| 11 |
| 12 Performance is recorded as the average latency of N playbacks. I.e., if we play |
| 13 a clip 50 times and the ideal duration of all playbacks is 1000ms and the total |
| 14 duration is 1500ms, the recorded result is (1500ms - 1000ms) / 50 == 10ms. |
| 15 """ |
| 16 import os |
| 17 |
| 18 import pyauto_media |
| 19 import pyauto_utils |
| 20 import pyauto |
| 21 |
| 22 |
| 23 # HTML test path; relative to src/chrome/test/data. |
| 24 _TEST_HTML_PATH = os.path.join('media', 'html', 'audio_latency_perf.html') |
| 25 |
| 26 |
| 27 class AudioLatencyPerfTest(pyauto.PyUITest): |
| 28 """PyAuto test container. See file doc string for more information.""" |
| 29 |
| 30 def testAudioLatency(self): |
| 31 """Launches HTML test which runs the audio latency test.""" |
| 32 self.NavigateToURL(self.GetFileURLForDataPath(_TEST_HTML_PATH)) |
| 33 |
| 34 # Block until the test finishes and notifies us. |
| 35 self.assertTrue(self.ExecuteJavascript('startTest();')) |
| 36 latency = float(self.GetDOMValue('averageLatency')) |
| 37 pyauto_utils.PrintPerfResult('audio_latency', 'latency', latency, 'ms') |
| 38 |
| 39 |
| 40 if __name__ == '__main__': |
| 41 pyauto_media.Main() |
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