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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "media/audio/simple_sources.h"
#include <stddef.h>
#include <stdint.h>
#include <array>
#include <limits>
#include <memory>
#include "base/containers/span.h"
#include "base/files/file_util.h"
#include "base/time/time.h"
#include "media/audio/audio_io.h"
#include "media/audio/test_data.h"
#include "media/base/audio_bus.h"
#include "media/base/audio_parameters.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 int freq = 200;
AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR,
ChannelLayoutConfig::Mono(),
AudioParameters::kTelephoneSampleRate, samples);
SineWaveAudioSource source(1, freq, params.sample_rate());
std::unique_ptr<AudioBus> audio_bus = AudioBus::Create(params);
source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get());
EXPECT_EQ(1, source.callbacks());
EXPECT_EQ(0, source.errors());
uint32_t half_period = AudioParameters::kTelephoneSampleRate / (freq * 2);
auto first_channel = audio_bus->channel_span(0);
// Spot test positive incursion of sine wave.
EXPECT_NEAR(0, first_channel[0], std::numeric_limits<float>::epsilon());
EXPECT_FLOAT_EQ(0.15643446f, first_channel[1]);
EXPECT_LT(first_channel[1], first_channel[2]);
EXPECT_LT(first_channel[2], first_channel[3]);
// Spot test negative incursion of sine wave.
EXPECT_NEAR(0, first_channel[half_period],
std::numeric_limits<float>::epsilon());
EXPECT_FLOAT_EQ(-0.15643446f, first_channel[half_period + 1]);
EXPECT_GT(first_channel[half_period + 1], first_channel[half_period + 2]);
EXPECT_GT(first_channel[half_period + 2], first_channel[half_period + 3]);
}
TEST(SimpleSources, SineWaveAudioCapped) {
SineWaveAudioSource source(1, 200, AudioParameters::kTelephoneSampleRate);
static const int kSampleCap = 100;
source.CapSamples(kSampleCap);
std::unique_ptr<AudioBus> audio_bus = AudioBus::Create(1, 2 * kSampleCap);
EXPECT_EQ(source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get()),
kSampleCap);
EXPECT_EQ(1, source.callbacks());
EXPECT_EQ(source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get()),
0);
EXPECT_EQ(2, source.callbacks());
source.Reset();
EXPECT_EQ(source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get()),
kSampleCap);
EXPECT_EQ(3, source.callbacks());
EXPECT_EQ(0, source.errors());
}
TEST(SimpleSources, OnError) {
SineWaveAudioSource source(1, 200, AudioParameters::kTelephoneSampleRate);
source.OnError(AudioOutputStream::AudioSourceCallback::ErrorType::kUnknown);
EXPECT_EQ(1, source.errors());
source.OnError(AudioOutputStream::AudioSourceCallback::ErrorType::kUnknown);
EXPECT_EQ(2, source.errors());
}
void VerifyContainsTestFile(const AudioBus* audio_bus) {
// Convert the test data (little-endian) into floats and compare. We need to
// index past the first bytes in the data, which contain the wav header.
const int kFirstSampleIndex = 12 + 8 + 16 + 8;
std::array<int16_t, 2> data;
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_span(0)[0]);
EXPECT_FLOAT_EQ(static_cast<float>(data[1]) / ((1 << 15) - 1),
audio_bus->channel_span(1)[0]);
// All other frames should be zero-padded. This applies even when looping, as
// the looping will restart on the next call to OnMoreData.
for (auto channel : audio_bus->AllChannels()) {
for (int frame = 1; frame < audio_bus->frames(); ++frame) {
EXPECT_FLOAT_EQ(0.0, channel[frame]);
}
}
}
TEST(SimpleSources, FileSourceTestDataWithoutLooping) {
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(base::byte_span_from_cstring(kTestAudioData));
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,
ChannelLayoutConfig::Stereo(), 48000, kNumFrames);
std::unique_ptr<AudioBus> audio_bus = AudioBus::Create(2, kNumFrames);
audio_bus->Zero();
// Create a FileSource that reads this file.
bool loop = false;
FileSource source(params, temp_path, loop);
EXPECT_EQ(kNumFrames,
source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get()));
VerifyContainsTestFile(audio_bus.get());
// We should not play any more audio after the file reaches its end.
audio_bus->Zero();
source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get());
EXPECT_TRUE(audio_bus->AreFramesZero());
}
TEST(SimpleSources, FileSourceTestDataWithLooping) {
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(base::byte_span_from_cstring(kTestAudioData));
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,
ChannelLayoutConfig::Stereo(), 48000, kNumFrames);
std::unique_ptr<AudioBus> audio_bus = AudioBus::Create(2, kNumFrames);
audio_bus->Zero();
bool loop = true;
FileSource source(params, temp_path, loop);
// Verify that we keep reading in the file when looping.
source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get());
audio_bus->Zero();
source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get());
VerifyContainsTestFile(audio_bus.get());
}
TEST(SimpleSources, BadFilePathFails) {
AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR,
ChannelLayoutConfig::Stereo(), 48000, 10);
std::unique_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"));
bool loop = false;
FileSource source(params, path, loop);
EXPECT_EQ(0, source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get()));
// Confirm all frames are zero-padded.
EXPECT_TRUE(audio_bus->AreFramesZero());
}
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(base::byte_span_from_cstring(kTestAudioData));
// 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,
ChannelLayoutConfig::Stereo(), 48000, kNumFrames);
std::unique_ptr<AudioBus> audio_bus = AudioBus::Create(2, kNumFrames);
audio_bus->Zero();
// Create a FileSource that reads this file.
bool loop = false;
FileSource source(params, temp_path, loop);
EXPECT_EQ(0, source.OnMoreData(base::TimeDelta(), base::TimeTicks::Now(), {},
audio_bus.get()));
// Confirm all frames are zero-padded.
EXPECT_TRUE(audio_bus->AreFramesZero());
}
} // namespace media
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