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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
// Unit tests for Accelerate and PreemptiveExpand classes.
#include <map>
#include <memory>
#include "common_audio/signal_processing/include/signal_processing_library.h"
#include "modules/audio_coding/neteq/accelerate.h"
#include "modules/audio_coding/neteq/background_noise.h"
#include "modules/audio_coding/neteq/preemptive_expand.h"
#include "modules/audio_coding/neteq/tools/input_audio_file.h"
#include "rtc_base/checks.h"
#include "test/gtest.h"
#include "test/testsupport/file_utils.h"
namespace webrtc {
namespace {
const size_t kNumChannels = 1;
TEST(TimeStretch, CreateAndDestroy) {
const int kSampleRate = 8000;
const int kOverlapSamples = 5 * kSampleRate / 8000;
BackgroundNoise bgn(kNumChannels);
Accelerate accelerate(kSampleRate, kNumChannels, bgn);
PreemptiveExpand preemptive_expand(kSampleRate, kNumChannels, bgn,
TEST(TimeStretch, CreateUsingFactory) {
const int kSampleRate = 8000;
const int kOverlapSamples = 5 * kSampleRate / 8000;
BackgroundNoise bgn(kNumChannels);
AccelerateFactory accelerate_factory;
Accelerate* accelerate =
accelerate_factory.Create(kSampleRate, kNumChannels, bgn);
EXPECT_TRUE(accelerate != NULL);
delete accelerate;
PreemptiveExpandFactory preemptive_expand_factory;
PreemptiveExpand* preemptive_expand = preemptive_expand_factory.Create(
kSampleRate, kNumChannels, bgn, kOverlapSamples);
EXPECT_TRUE(preemptive_expand != NULL);
delete preemptive_expand;
class TimeStretchTest : public ::testing::Test {
: input_file_(new test::InputAudioFile(
test::ResourcePath("audio_coding/testfile32kHz", "pcm"))),
block_size_(30 * sample_rate_hz_ / 1000), // 30 ms
audio_(new int16_t[block_size_]),
background_noise_(kNumChannels) {}
const int16_t* Next30Ms() {
RTC_CHECK(input_file_->Read(block_size_, audio_.get()));
return audio_.get();
// Returns the total length change (in samples) that the accelerate operation
// resulted in during the run.
size_t TestAccelerate(size_t loops, bool fast_mode) {
Accelerate accelerate(sample_rate_hz_, kNumChannels, background_noise_);
size_t total_length_change = 0;
for (size_t i = 0; i < loops; ++i) {
AudioMultiVector output(kNumChannels);
size_t length_change;
UpdateReturnStats(accelerate.Process(Next30Ms(), block_size_, fast_mode,
&output, &length_change));
total_length_change += length_change;
return total_length_change;
void UpdateReturnStats(TimeStretch::ReturnCodes ret) {
switch (ret) {
case TimeStretch::kSuccess:
case TimeStretch::kSuccessLowEnergy:
case TimeStretch::kNoStretch:
case TimeStretch::kError:
FAIL() << "Process returned an error";
std::unique_ptr<test::InputAudioFile> input_file_;
const int sample_rate_hz_;
const size_t block_size_;
std::unique_ptr<int16_t[]> audio_;
std::map<TimeStretch::ReturnCodes, int> return_stats_;
BackgroundNoise background_noise_;
TEST_F(TimeStretchTest, Accelerate) {
// TestAccelerate returns the total length change in samples.
EXPECT_EQ(15268U, TestAccelerate(100, false));
EXPECT_EQ(9, return_stats_[TimeStretch::kSuccess]);
EXPECT_EQ(58, return_stats_[TimeStretch::kSuccessLowEnergy]);
EXPECT_EQ(33, return_stats_[TimeStretch::kNoStretch]);
TEST_F(TimeStretchTest, AccelerateFastMode) {
// TestAccelerate returns the total length change in samples.
EXPECT_EQ(21400U, TestAccelerate(100, true));
EXPECT_EQ(31, return_stats_[TimeStretch::kSuccess]);
EXPECT_EQ(58, return_stats_[TimeStretch::kSuccessLowEnergy]);
EXPECT_EQ(11, return_stats_[TimeStretch::kNoStretch]);
} // namespace webrtc