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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits>
#include "base/logging.h"
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "media/audio/audio_parameters.h"
#include "media/audio/simple_sources.h"
#include "media/base/audio_bus.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
// Validate that the SineWaveAudioSource writes the expected values.
TEST(SimpleSources, SineWaveAudioSource) {
static const uint32 samples = 1024;
static const uint32 bytes_per_sample = 2;
static const int freq = 200;
AudioParameters params(
AudioParameters::AUDIO_PCM_LINEAR, CHANNEL_LAYOUT_MONO,
AudioParameters::kTelephoneSampleRate, bytes_per_sample * 8, samples);
SineWaveAudioSource source(1, freq, params.sample_rate());
scoped_ptr<AudioBus> audio_bus = AudioBus::Create(params);
source.OnMoreData(audio_bus.get(), AudioBuffersState());
EXPECT_EQ(1, source.callbacks());
EXPECT_EQ(0, source.errors());
uint32 half_period = AudioParameters::kTelephoneSampleRate / (freq * 2);
// Spot test positive incursion of sine wave.
EXPECT_NEAR(0, audio_bus->channel(0)[0],
std::numeric_limits<float>::epsilon());
EXPECT_FLOAT_EQ(0.15643446f, audio_bus->channel(0)[1]);
EXPECT_LT(audio_bus->channel(0)[1], audio_bus->channel(0)[2]);
EXPECT_LT(audio_bus->channel(0)[2], audio_bus->channel(0)[3]);
// Spot test negative incursion of sine wave.
EXPECT_NEAR(0, audio_bus->channel(0)[half_period],
std::numeric_limits<float>::epsilon());
EXPECT_FLOAT_EQ(-0.15643446f, audio_bus->channel(0)[half_period + 1]);
EXPECT_GT(audio_bus->channel(0)[half_period + 1],
audio_bus->channel(0)[half_period + 2]);
EXPECT_GT(audio_bus->channel(0)[half_period + 2],
audio_bus->channel(0)[half_period + 3]);
}
TEST(SimpleSources, SineWaveAudioCapped) {
SineWaveAudioSource source(1, 200, AudioParameters::kTelephoneSampleRate);
static const int kSampleCap = 100;
source.CapSamples(kSampleCap);
scoped_ptr<AudioBus> audio_bus = AudioBus::Create(1, 2 * kSampleCap);
EXPECT_EQ(source.OnMoreData(
audio_bus.get(), AudioBuffersState()), kSampleCap);
EXPECT_EQ(1, source.callbacks());
EXPECT_EQ(source.OnMoreData(audio_bus.get(), AudioBuffersState()), 0);
EXPECT_EQ(2, source.callbacks());
source.Reset();
EXPECT_EQ(source.OnMoreData(
audio_bus.get(), AudioBuffersState()), kSampleCap);
EXPECT_EQ(3, source.callbacks());
EXPECT_EQ(0, source.errors());
}
TEST(SimpleSources, OnError) {
SineWaveAudioSource source(1, 200, AudioParameters::kTelephoneSampleRate);
source.OnError(NULL);
EXPECT_EQ(1, source.errors());
source.OnError(NULL);
EXPECT_EQ(2, source.errors());
}
} // namespace media
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