src/media/audio/fake_audio_consumer_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 "base/bind.h"
   6 #include "base/message_loop/message_loop.h"
   7 #include "base/time/time.h"
   8 #include "media/audio/audio_buffers_state.h"
   9 #include "media/audio/audio_parameters.h"
  10 #include "media/audio/fake_audio_consumer.h"
  11 #include "media/audio/simple_sources.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 namespace media {
  15
  16 static const int kTestCallbacks = 5;
  17
  18 class FakeAudioConsumerTest : public testing::Test {
  19  public:
  20   FakeAudioConsumerTest()
  21       : params_(
  22             AudioParameters::AUDIO_FAKE, CHANNEL_LAYOUT_STEREO, 44100, 8, 128),
  23         fake_consumer_(message_loop_.message_loop_proxy(), params_),
  24         source_(params_.channels(), 200.0, params_.sample_rate()) {
  25     time_between_callbacks_ = base::TimeDelta::FromMicroseconds(
  26         params_.frames_per_buffer() * base::Time::kMicrosecondsPerSecond /
  27         static_cast<float>(params_.sample_rate()));
  28   }
  29
  30   virtual ~FakeAudioConsumerTest() {}
  31
  32   void ConsumeData(AudioBus* audio_bus) {
  33     source_.OnMoreData(audio_bus, AudioBuffersState());
  34   }
  35
  36   void RunOnAudioThread() {
  37     ASSERT_TRUE(message_loop_.message_loop_proxy()->BelongsToCurrentThread());
  38     fake_consumer_.Start(base::Bind(
  39         &FakeAudioConsumerTest::ConsumeData, base::Unretained(this)));
  40   }
  41
  42   void RunOnceOnAudioThread() {
  43     ASSERT_TRUE(message_loop_.message_loop_proxy()->BelongsToCurrentThread());
  44     RunOnAudioThread();
  45     // Start() should immediately post a task to run the source callback, so we
  46     // should end up with only a single callback being run.
  47     message_loop_.PostTask(FROM_HERE, base::Bind(
  48         &FakeAudioConsumerTest::EndTest, base::Unretained(this), 1));
  49   }
  50
  51   void StopStartOnAudioThread() {
  52     ASSERT_TRUE(message_loop_.message_loop_proxy()->BelongsToCurrentThread());
  53     fake_consumer_.Stop();
  54     RunOnAudioThread();
  55   }
  56
  57   void TimeCallbacksOnAudioThread(int callbacks) {
  58     ASSERT_TRUE(message_loop_.message_loop_proxy()->BelongsToCurrentThread());
  59
  60     if (source_.callbacks() == 0) {
  61       RunOnAudioThread();
  62       start_time_ = base::TimeTicks::Now();
  63     }
  64
  65     // Keep going until we've seen the requested number of callbacks.
  66     if (source_.callbacks() < callbacks) {
  67       message_loop_.PostDelayedTask(FROM_HERE, base::Bind(
  68           &FakeAudioConsumerTest::TimeCallbacksOnAudioThread,
  69           base::Unretained(this), callbacks), time_between_callbacks_ / 2);
  70     } else {
  71       end_time_ = base::TimeTicks::Now();
  72       EndTest(callbacks);
  73     }
  74   }
  75
  76   void EndTest(int callbacks) {
  77     ASSERT_TRUE(message_loop_.message_loop_proxy()->BelongsToCurrentThread());
  78     fake_consumer_.Stop();
  79     EXPECT_LE(callbacks, source_.callbacks());
  80     message_loop_.PostTask(FROM_HERE, base::MessageLoop::QuitClosure());
  81   }
  82
  83  protected:
  84   base::MessageLoop message_loop_;
  85   AudioParameters params_;
  86   FakeAudioConsumer fake_consumer_;
  87   SineWaveAudioSource source_;
  88   base::TimeTicks start_time_;
  89   base::TimeTicks end_time_;
  90   base::TimeDelta time_between_callbacks_;
  91
  92  private:
  93   DISALLOW_COPY_AND_ASSIGN(FakeAudioConsumerTest);
  94 };
  95
  96 // Ensure the fake audio stream runs on the audio thread and handles fires
  97 // callbacks to the AudioSourceCallback.
  98 TEST_F(FakeAudioConsumerTest, FakeStreamBasicCallback) {
  99   message_loop_.PostTask(FROM_HERE, base::Bind(
 100       &FakeAudioConsumerTest::RunOnceOnAudioThread,
 101       base::Unretained(this)));
 102   message_loop_.Run();
 103 }
 104
 105 // Ensure the time between callbacks is sane.
 106 TEST_F(FakeAudioConsumerTest, TimeBetweenCallbacks) {
 107   message_loop_.PostTask(FROM_HERE, base::Bind(
 108       &FakeAudioConsumerTest::TimeCallbacksOnAudioThread,
 109       base::Unretained(this), kTestCallbacks));
 110   message_loop_.Run();
 111
 112   // There are only (kTestCallbacks - 1) intervals between kTestCallbacks.
 113   base::TimeDelta actual_time_between_callbacks =
 114       (end_time_ - start_time_) / (source_.callbacks() - 1);
 115
 116   // Ensure callback time is no faster than the expected time between callbacks.
 117   EXPECT_TRUE(actual_time_between_callbacks >= time_between_callbacks_);
 118
 119   // Softly check if the callback time is no slower than twice the expected time
 120   // between callbacks.  Since this test runs on the bots we can't be too strict
 121   // with the bounds.
 122   if (actual_time_between_callbacks > 2 * time_between_callbacks_)
 123     LOG(ERROR) << "Time between fake audio callbacks is too large!";
 124 }
 125
 126 // Ensure Start()/Stop() on the stream doesn't generate too many callbacks.  See
 127 // http://crbug.com/159049
 128 TEST_F(FakeAudioConsumerTest, StartStopClearsCallbacks) {
 129   message_loop_.PostTask(FROM_HERE, base::Bind(
 130       &FakeAudioConsumerTest::TimeCallbacksOnAudioThread,
 131       base::Unretained(this), kTestCallbacks));
 132
 133   // Issue a Stop() / Start() in between expected callbacks to maximize the
 134   // chance of catching the FakeAudioOutputStream doing the wrong thing.
 135   message_loop_.PostDelayedTask(FROM_HERE, base::Bind(
 136       &FakeAudioConsumerTest::StopStartOnAudioThread,
 137       base::Unretained(this)), time_between_callbacks_ / 2);
 138
 139   // EndTest() will ensure the proper number of callbacks have occurred.
 140   message_loop_.Run();
 141 }
 142
 143 }  // namespace media