remoting/host/audio_silence_detector_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/host/audio_silence_detector.h"
   6
   7 #include "base/basictypes.h"
   8 #include "testing/gtest/include/gtest/gtest.h"
   9
  10 namespace remoting {
  11
  12 namespace {
  13
  14 const int kSamplingRate = 1000;
  15
  16 void TestSilenceDetector(AudioSilenceDetector* target,
  17                          const int16* samples, int samples_count,
  18                          bool silence_expected) {
  19   target->Reset(kSamplingRate, 1);
  20   bool silence_started = false;
  21   int threshold_length = 0;
  22   for (int i = 0; i < 3 * kSamplingRate / samples_count; ++i) {
  23     bool result = target->IsSilence(samples, samples_count);
  24     if (silence_started) {
  25       ASSERT_TRUE(result);
  26     } else if (result) {
  27       silence_started = true;
  28       threshold_length = i * samples_count;
  29     }
  30   }
  31
  32   // Check that the silence was detected if it was expected.
  33   EXPECT_EQ(silence_expected, silence_started);
  34
  35   if (silence_expected) {
  36     // Check that silence threshold is between 0.5 and 2 seconds.
  37     EXPECT_GE(threshold_length, kSamplingRate / 2);
  38     EXPECT_LE(threshold_length, kSamplingRate * 2);
  39   }
  40 }
  41
  42 }  // namespace
  43
  44 TEST(AudioSilenceDetectorTest, Silence) {
  45   const int16 kSamples[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
  46
  47   AudioSilenceDetector target(0);
  48   TestSilenceDetector(&target, kSamples, arraysize(kSamples), true);
  49 }
  50
  51 TEST(AudioSilenceDetectorTest, Sound) {
  52   const int16 kSamples[] = {65, 73, 83, 89, 92, -1, 5, 9, 123, 0};
  53
  54   AudioSilenceDetector target(0);
  55   TestSilenceDetector(&target, kSamples, arraysize(kSamples), false);
  56 }
  57
  58 TEST(AudioSilenceDetectorTest, Threshold) {
  59   const int16 kSamples[] = {0, 0, 0, 0, 1, 0, 0, -1, 0, 0};
  60
  61   AudioSilenceDetector target1(0);
  62   TestSilenceDetector(&target1, kSamples, arraysize(kSamples), false);
  63
  64   AudioSilenceDetector target2(1);
  65   TestSilenceDetector(&target2, kSamples, arraysize(kSamples), true);
  66 }
  67
  68 }  // namespace remoting