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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/files/file_util.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "media/audio/audio_parameters.h"
#include "media/audio/simple_sources.h"
#include "media/audio/sounds/test_data.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_t samples = 1024;
static const uint32_t 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(), 0, 0);
EXPECT_EQ(1, source.callbacks());
EXPECT_EQ(0, source.errors());
uint32_t 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(), 0, 0), kSampleCap);
EXPECT_EQ(1, source.callbacks());
EXPECT_EQ(source.OnMoreData(audio_bus.get(), 0, 0), 0);
EXPECT_EQ(2, source.callbacks());
source.Reset();
EXPECT_EQ(source.OnMoreData(audio_bus.get(), 0, 0), 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());
}
TEST(SimpleSources, FileSourceTestData) {
const int kNumFrames = 10;
// Create a temporary file filled with WAV data.
base::FilePath temp_path;
ASSERT_TRUE(base::CreateTemporaryFile(&temp_path));
base::File temp(temp_path,
base::File::FLAG_WRITE | base::File::FLAG_OPEN_ALWAYS);
temp.WriteAtCurrentPos(kTestAudioData, kTestAudioDataSize);
ASSERT_EQ(kTestAudioDataSize, static_cast<size_t>(temp.GetLength()));
temp.Close();
// Create AudioParameters which match those in the WAV data.
AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR,
CHANNEL_LAYOUT_STEREO, 48000, 16, kNumFrames);
scoped_ptr<AudioBus> audio_bus = AudioBus::Create(2, kNumFrames);
audio_bus->Zero();
// Create a FileSource that reads this file.
FileSource source(params, temp_path);
EXPECT_EQ(kNumFrames, source.OnMoreData(audio_bus.get(), 0, 0));
// Convert the test data (little-endian) into floats and compare.
const int kFirstSampleIndex = 12 + 8 + 16 + 8;
int16_t data[2];
data[0] = kTestAudioData[kFirstSampleIndex];
data[0] |= (kTestAudioData[kFirstSampleIndex + 1] << 8);
data[1] = kTestAudioData[kFirstSampleIndex + 2];
data[1] |= (kTestAudioData[kFirstSampleIndex + 3] << 8);
// The first frame should hold the WAV data.
EXPECT_FLOAT_EQ(static_cast<float>(data[0]) / ((1 << 15) - 1),
audio_bus->channel(0)[0]);
EXPECT_FLOAT_EQ(static_cast<float>(data[1]) / ((1 << 15) - 1),
audio_bus->channel(1)[0]);
// All other frames should be zero-padded.
for (int channel = 0; channel < audio_bus->channels(); ++channel) {
for (int frame = 1; frame < audio_bus->frames(); ++frame) {
EXPECT_FLOAT_EQ(0.0, audio_bus->channel(channel)[frame]);
}
}
}
TEST(SimpleSources, BadFilePathFails) {
AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR,
CHANNEL_LAYOUT_STEREO, 48000, 16, 10);
scoped_ptr<AudioBus> audio_bus = AudioBus::Create(2, 10);
audio_bus->Zero();
// Create a FileSource that reads this file.
base::FilePath path;
path = path.Append(FILE_PATH_LITERAL("does"))
.Append(FILE_PATH_LITERAL("not"))
.Append(FILE_PATH_LITERAL("exist"));
FileSource source(params, path);
EXPECT_EQ(0, source.OnMoreData(audio_bus.get(), 0, 0));
// Confirm all frames are zero-padded.
for (int channel = 0; channel < audio_bus->channels(); ++channel) {
for (int frame = 0; frame < audio_bus->frames(); ++frame) {
EXPECT_FLOAT_EQ(0.0, audio_bus->channel(channel)[frame]);
}
}
}
TEST(SimpleSources, FileSourceCorruptTestDataFails) {
const int kNumFrames = 10;
// Create a temporary file filled with WAV data.
base::FilePath temp_path;
ASSERT_TRUE(base::CreateTemporaryFile(&temp_path));
base::File temp(temp_path,
base::File::FLAG_WRITE | base::File::FLAG_OPEN_ALWAYS);
temp.WriteAtCurrentPos(kTestAudioData, kTestAudioDataSize);
// Corrupt the header.
temp.Write(3, "0x00", 1);
ASSERT_EQ(kTestAudioDataSize, static_cast<size_t>(temp.GetLength()));
temp.Close();
// Create AudioParameters which match those in the WAV data.
AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR,
CHANNEL_LAYOUT_STEREO, 48000, 16, kNumFrames);
scoped_ptr<AudioBus> audio_bus = AudioBus::Create(2, kNumFrames);
audio_bus->Zero();
// Create a FileSource that reads this file.
FileSource source(params, temp_path);
EXPECT_EQ(0, source.OnMoreData(audio_bus.get(), 0, 0));
// Confirm all frames are zero-padded.
for (int channel = 0; channel < audio_bus->channels(); ++channel) {
for (int frame = 0; frame < audio_bus->frames(); ++frame) {
EXPECT_FLOAT_EQ(0.0, audio_bus->channel(channel)[frame]);
}
}
}
} // namespace media
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