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.
TEST(SimpleSources,SineWaveAudioSource)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(), AudioBuffersState());
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
TEST(SimpleSources,SineWaveAudioCapped)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(), AudioBuffersState()), kSampleCap);
60 EXPECT_EQ(1, source.callbacks());
61 EXPECT_EQ(source.OnMoreData(audio_bus.get(), AudioBuffersState()), 0);
62 EXPECT_EQ(2, source.callbacks());
63 source.Reset();
64 EXPECT_EQ(source.OnMoreData(
65 audio_bus.get(), AudioBuffersState()), kSampleCap);
66 EXPECT_EQ(3, source.callbacks());
67 EXPECT_EQ(0, source.errors());
68 }
69
TEST(SimpleSources,OnError)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
79