media/audio/simple_sources_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 <limits>
   6
   7 #include "base/logging.h"
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "media/audio/audio_parameters.h"
  11 #include "media/audio/simple_sources.h"
  12 #include "media/base/audio_bus.h"
  13 #include "testing/gtest/include/gtest/gtest.h"
  14
  15 namespace media {
  16
  17 // Validate that the SineWaveAudioSource writes the expected values.
  18 TEST(SimpleSources, SineWaveAudioSource) {
  19   static const uint32 samples = 1024;
  20   static const uint32 bytes_per_sample = 2;
  21   static const int freq = 200;
  22
  23   AudioParameters params(
  24         AudioParameters::AUDIO_PCM_LINEAR, CHANNEL_LAYOUT_MONO,
  25         AudioParameters::kTelephoneSampleRate, bytes_per_sample * 8, samples);
  26
  27   SineWaveAudioSource source(1, freq, params.sample_rate());
  28   scoped_ptr<AudioBus> audio_bus = AudioBus::Create(params);
  29   source.OnMoreData(audio_bus.get(), 0);
  30   EXPECT_EQ(1, source.callbacks());
  31   EXPECT_EQ(0, source.errors());
  32
  33   uint32 half_period = AudioParameters::kTelephoneSampleRate / (freq * 2);
  34
  35   // Spot test positive incursion of sine wave.
  36   EXPECT_NEAR(0, audio_bus->channel(0)[0],
  37               std::numeric_limits<float>::epsilon());
  38   EXPECT_FLOAT_EQ(0.15643446f, audio_bus->channel(0)[1]);
  39   EXPECT_LT(audio_bus->channel(0)[1], audio_bus->channel(0)[2]);
  40   EXPECT_LT(audio_bus->channel(0)[2], audio_bus->channel(0)[3]);
  41   // Spot test negative incursion of sine wave.
  42   EXPECT_NEAR(0, audio_bus->channel(0)[half_period],
  43               std::numeric_limits<float>::epsilon());
  44   EXPECT_FLOAT_EQ(-0.15643446f, audio_bus->channel(0)[half_period + 1]);
  45   EXPECT_GT(audio_bus->channel(0)[half_period + 1],
  46             audio_bus->channel(0)[half_period + 2]);
  47   EXPECT_GT(audio_bus->channel(0)[half_period + 2],
  48             audio_bus->channel(0)[half_period + 3]);
  49 }
  50
  51 TEST(SimpleSources, SineWaveAudioCapped) {
  52   SineWaveAudioSource source(1, 200, AudioParameters::kTelephoneSampleRate);
  53
  54   static const int kSampleCap = 100;
  55   source.CapSamples(kSampleCap);
  56
  57   scoped_ptr<AudioBus> audio_bus = AudioBus::Create(1, 2 * kSampleCap);
  58   EXPECT_EQ(source.OnMoreData(
  59       audio_bus.get(), 0), kSampleCap);
  60   EXPECT_EQ(1, source.callbacks());
  61   EXPECT_EQ(source.OnMoreData(audio_bus.get(), 0), 0);
  62   EXPECT_EQ(2, source.callbacks());
  63   source.Reset();
  64   EXPECT_EQ(source.OnMoreData(
  65       audio_bus.get(), 0), kSampleCap);
  66   EXPECT_EQ(3, source.callbacks());
  67   EXPECT_EQ(0, source.errors());
  68 }
  69
  70 TEST(SimpleSources, OnError) {
  71   SineWaveAudioSource source(1, 200, AudioParameters::kTelephoneSampleRate);
  72   source.OnError(NULL);
  73   EXPECT_EQ(1, source.errors());
  74   source.OnError(NULL);
  75   EXPECT_EQ(2, source.errors());
  76 }
  77
  78 }  // namespace media