src/media/filters/audio_clock_unittest.cc

   1 // Copyright 2014 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 "media/base/audio_timestamp_helper.h"
   6 #include "media/base/buffers.h"
   7 #include "media/filters/audio_clock.h"
   8 #include "testing/gtest/include/gtest/gtest.h"
   9
  10 namespace media {
  11
  12 class AudioClockTest : public testing::Test {
  13  public:
  14   AudioClockTest()
  15       : sample_rate_(10),
  16         timestamp_helper_(sample_rate_),
  17         clock_(sample_rate_) {
  18     timestamp_helper_.SetBaseTimestamp(base::TimeDelta());
  19   }
  20
  21   virtual ~AudioClockTest() {}
  22
  23   void WroteAudio(int frames, int delay_frames, float playback_rate) {
  24     timestamp_helper_.AddFrames(static_cast<int>(frames * playback_rate));
  25     clock_.WroteAudio(
  26         frames, delay_frames, playback_rate, timestamp_helper_.GetTimestamp());
  27   }
  28
  29   void WroteSilence(int frames, int delay_frames) {
  30     clock_.WroteSilence(frames, delay_frames);
  31   }
  32
  33   int CurrentMediaTimestampInMilliseconds() {
  34     return clock_.CurrentMediaTimestamp().InMilliseconds();
  35   }
  36
  37   int LastEndpointTimestampInMilliseconds() {
  38     return clock_.last_endpoint_timestamp().InMilliseconds();
  39   }
  40
  41   const int sample_rate_;
  42   AudioTimestampHelper timestamp_helper_;
  43   AudioClock clock_;
  44
  45  private:
  46   DISALLOW_COPY_AND_ASSIGN(AudioClockTest);
  47 };
  48
  49 TEST_F(AudioClockTest, TimestampsStartAtNoTimestamp) {
  50   EXPECT_EQ(kNoTimestamp(), clock_.CurrentMediaTimestamp());
  51   EXPECT_EQ(kNoTimestamp(), clock_.last_endpoint_timestamp());
  52 }
  53
  54 TEST_F(AudioClockTest, Playback) {
  55   // The first time we write data we should expect a negative time matching the
  56   // current delay.
  57   WroteAudio(10, 20, 1.0);
  58   EXPECT_EQ(-2000, CurrentMediaTimestampInMilliseconds());
  59   EXPECT_EQ(1000, LastEndpointTimestampInMilliseconds());
  60
  61   // The media time should keep advancing as we write data.
  62   WroteAudio(10, 20, 1.0);
  63   EXPECT_EQ(-1000, CurrentMediaTimestampInMilliseconds());
  64   EXPECT_EQ(2000, LastEndpointTimestampInMilliseconds());
  65
  66   WroteAudio(10, 20, 1.0);
  67   EXPECT_EQ(0, CurrentMediaTimestampInMilliseconds());
  68   EXPECT_EQ(3000, LastEndpointTimestampInMilliseconds());
  69
  70   WroteAudio(10, 20, 1.0);
  71   EXPECT_EQ(1000, CurrentMediaTimestampInMilliseconds());
  72   EXPECT_EQ(4000, LastEndpointTimestampInMilliseconds());
  73
  74   // Introduce a rate change to slow down time. Current time will keep advancing
  75   // by one second until it hits the slowed down audio.
  76   WroteAudio(10, 20, 0.5);
  77   EXPECT_EQ(2000, CurrentMediaTimestampInMilliseconds());
  78   EXPECT_EQ(4500, LastEndpointTimestampInMilliseconds());
  79
  80   WroteAudio(10, 20, 0.5);
  81   EXPECT_EQ(3000, CurrentMediaTimestampInMilliseconds());
  82   EXPECT_EQ(5000, LastEndpointTimestampInMilliseconds());
  83
  84   WroteAudio(10, 20, 0.5);
  85   EXPECT_EQ(4000, CurrentMediaTimestampInMilliseconds());
  86   EXPECT_EQ(5500, LastEndpointTimestampInMilliseconds());
  87
  88   WroteAudio(10, 20, 0.5);
  89   EXPECT_EQ(4500, CurrentMediaTimestampInMilliseconds());
  90   EXPECT_EQ(6000, LastEndpointTimestampInMilliseconds());
  91
  92   // Introduce a rate change to speed up time. Current time will keep advancing
  93   // by half a second until it hits the the sped up audio.
  94   WroteAudio(10, 20, 2);
  95   EXPECT_EQ(5000, CurrentMediaTimestampInMilliseconds());
  96   EXPECT_EQ(8000, LastEndpointTimestampInMilliseconds());
  97
  98   WroteAudio(10, 20, 2);
  99   EXPECT_EQ(5500, CurrentMediaTimestampInMilliseconds());
 100   EXPECT_EQ(10000, LastEndpointTimestampInMilliseconds());
 101
 102   WroteAudio(10, 20, 2);
 103   EXPECT_EQ(6000, CurrentMediaTimestampInMilliseconds());
 104   EXPECT_EQ(12000, LastEndpointTimestampInMilliseconds());
 105
 106   WroteAudio(10, 20, 2);
 107   EXPECT_EQ(8000, CurrentMediaTimestampInMilliseconds());
 108   EXPECT_EQ(14000, LastEndpointTimestampInMilliseconds());
 109
 110   // Write silence to simulate reaching end of stream.
 111   WroteSilence(10, 20);
 112   EXPECT_EQ(10000, CurrentMediaTimestampInMilliseconds());
 113   EXPECT_EQ(14000, LastEndpointTimestampInMilliseconds());
 114
 115   WroteSilence(10, 20);
 116   EXPECT_EQ(12000, CurrentMediaTimestampInMilliseconds());
 117   EXPECT_EQ(14000, LastEndpointTimestampInMilliseconds());
 118
 119   WroteSilence(10, 20);
 120   EXPECT_EQ(14000, CurrentMediaTimestampInMilliseconds());
 121   EXPECT_EQ(14000, LastEndpointTimestampInMilliseconds());
 122
 123   // At this point media time should stop increasing.
 124   WroteSilence(10, 20);
 125   EXPECT_EQ(14000, CurrentMediaTimestampInMilliseconds());
 126   EXPECT_EQ(14000, LastEndpointTimestampInMilliseconds());
 127 }
 128
 129 TEST_F(AudioClockTest, AlternatingAudioAndSilence) {
 130   // Buffer #1: [0, 1000)
 131   WroteAudio(10, 20, 1.0);
 132   EXPECT_EQ(-2000, CurrentMediaTimestampInMilliseconds());
 133
 134   // Buffer #2: 1000ms of silence
 135   WroteSilence(10, 20);
 136   EXPECT_EQ(-1000, CurrentMediaTimestampInMilliseconds());
 137
 138   // Buffer #3: [1000, 2000), buffer #1 is at front
 139   WroteAudio(10, 20, 1.0);
 140   EXPECT_EQ(0, CurrentMediaTimestampInMilliseconds());
 141
 142   // Buffer #4: 1000ms of silence, time shouldn't advance
 143   WroteSilence(10, 20);
 144   EXPECT_EQ(0, CurrentMediaTimestampInMilliseconds());
 145
 146   // Buffer #5: [2000, 3000), buffer #3 is at front
 147   WroteAudio(10, 20, 1.0);
 148   EXPECT_EQ(1000, CurrentMediaTimestampInMilliseconds());
 149 }
 150
 151 TEST_F(AudioClockTest, ZeroDelay) {
 152   // The first time we write data we should expect the first timestamp
 153   // immediately.
 154   WroteAudio(10, 0, 1.0);
 155   EXPECT_EQ(0, CurrentMediaTimestampInMilliseconds());
 156   EXPECT_EQ(1000, LastEndpointTimestampInMilliseconds());
 157
 158   // Ditto for all subsequent buffers.
 159   WroteAudio(10, 0, 1.0);
 160   EXPECT_EQ(1000, CurrentMediaTimestampInMilliseconds());
 161   EXPECT_EQ(2000, LastEndpointTimestampInMilliseconds());
 162
 163   WroteAudio(10, 0, 1.0);
 164   EXPECT_EQ(2000, CurrentMediaTimestampInMilliseconds());
 165   EXPECT_EQ(3000, LastEndpointTimestampInMilliseconds());
 166
 167   // Ditto for silence.
 168   WroteSilence(10, 0);
 169   EXPECT_EQ(3000, CurrentMediaTimestampInMilliseconds());
 170   EXPECT_EQ(3000, LastEndpointTimestampInMilliseconds());
 171
 172   WroteSilence(10, 0);
 173   EXPECT_EQ(3000, CurrentMediaTimestampInMilliseconds());
 174   EXPECT_EQ(3000, LastEndpointTimestampInMilliseconds());
 175 }
 176
 177 }  // namespace media