| #!/usr/bin/env python |
| # Copyright (c) 2012 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. |
| |
| """Audio latency performance test. |
| |
| Benchmark measuring how fast we can continuously repeat a short sound clip. In |
| the ideal scenario we'd have zero latency processing script, seeking back to the |
| beginning of the clip, and resuming audio playback. |
| |
| Performance is recorded as the average latency of N playbacks. I.e., if we play |
| a clip 50 times and the ideal duration of all playbacks is 1000ms and the total |
| duration is 1500ms, the recorded result is (1500ms - 1000ms) / 50 == 10ms. |
| """ |
| import os |
| |
| import pyauto_media |
| import pyauto_utils |
| import pyauto |
| |
| |
| # HTML test path; relative to src/chrome/test/data. |
| _TEST_HTML_PATH = os.path.join('media', 'html', 'audio_latency_perf.html') |
| |
| |
| class AudioLatencyPerfTest(pyauto.PyUITest): |
| """PyAuto test container. See file doc string for more information.""" |
| |
| def testAudioLatency(self): |
| """Launches HTML test which runs the audio latency test.""" |
| self.NavigateToURL(self.GetFileURLForDataPath(_TEST_HTML_PATH)) |
| |
| # Block until the test finishes and notifies us. |
| self.assertTrue(self.ExecuteJavascript('startTest();')) |
| latency = float(self.GetDOMValue('averageLatency')) |
| pyauto_utils.PrintPerfResult('audio_latency', 'latency', latency, 'ms') |
| |
| |
| if __name__ == '__main__': |
| pyauto_media.Main() |