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/*
* Copyright (c) 2011 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.
*/
#include "common_audio/resampler/include/resampler.h"
#include <array>
#include "rtc_base/strings/string_builder.h"
#include "test/gtest.h"
// TODO(andrew): this is a work-in-progress. Many more tests are needed.
namespace webrtc {
namespace {
// Rates we must support.
const int kMaxRate = 96000;
const int kRates[] = {8000, 16000, 32000, 44000, 48000, kMaxRate};
const size_t kRatesSize = sizeof(kRates) / sizeof(*kRates);
const int kMaxChannels = 2;
const size_t kDataSize = static_cast<size_t>(kMaxChannels * kMaxRate / 100);
// TODO(andrew): should we be supporting these combinations?
bool ValidRates(int in_rate, int out_rate) {
// Not the most compact notation, for clarity.
if ((in_rate == 44000 && (out_rate == 48000 || out_rate == 96000)) ||
(out_rate == 44000 && (in_rate == 48000 || in_rate == 96000))) {
return false;
}
return true;
}
class ResamplerTest : public ::testing::Test {
protected:
ResamplerTest();
void SetUp() override;
void TearDown() override;
void ResetIfNeededAndPush(int in_rate, int out_rate, int num_channels);
Resampler rs_;
int16_t data_in_[kDataSize];
int16_t data_out_[kDataSize];
};
ResamplerTest::ResamplerTest() {}
void ResamplerTest::SetUp() {
// Initialize input data with anything. The tests are content independent.
memset(data_in_, 1, sizeof(data_in_));
}
void ResamplerTest::TearDown() {}
void ResamplerTest::ResetIfNeededAndPush(int in_rate,
int out_rate,
int num_channels) {
StringBuilder ss;
ss << "Input rate: " << in_rate << ", output rate: " << out_rate
<< ", channel count: " << num_channels;
SCOPED_TRACE(ss.str());
if (ValidRates(in_rate, out_rate)) {
size_t in_length = static_cast<size_t>(in_rate / 100);
size_t out_length = 0;
EXPECT_EQ(0, rs_.ResetIfNeeded(in_rate, out_rate, num_channels));
EXPECT_EQ(0,
rs_.Push(data_in_, in_length, data_out_, kDataSize, out_length));
EXPECT_EQ(static_cast<size_t>(out_rate / 100), out_length);
} else {
EXPECT_EQ(-1, rs_.ResetIfNeeded(in_rate, out_rate, num_channels));
}
}
TEST_F(ResamplerTest, Reset) {
const int kNumChannels[] = {1, 2};
const size_t kNumChannelsSize = std::size(kNumChannels);
// The only failure mode for the constructor is if Reset() fails. For the
// time being then (until an Init function is added), we rely on Reset()
// to test the constructor.
// Check that all required combinations are supported.
for (size_t i = 0; i < kRatesSize; ++i) {
for (size_t j = 0; j < kRatesSize; ++j) {
for (size_t k = 0; k < kNumChannelsSize; ++k) {
StringBuilder ss;
ss << "Input rate: " << kRates[i] << ", output rate: " << kRates[j]
<< ", channels: " << kNumChannels[k];
SCOPED_TRACE(ss.str());
if (ValidRates(kRates[i], kRates[j]))
EXPECT_EQ(0, rs_.Reset(kRates[i], kRates[j], kNumChannels[k]));
else
EXPECT_EQ(-1, rs_.Reset(kRates[i], kRates[j], kNumChannels[k]));
}
}
}
}
// TODO(tlegrand): Replace code inside the two tests below with a function
// with number of channels and ResamplerType as input.
TEST_F(ResamplerTest, Mono) {
const int kChannels = 1;
for (size_t i = 0; i < kRatesSize; ++i) {
for (size_t j = 0; j < kRatesSize; ++j) {
StringBuilder ss;
ss << "Input rate: " << kRates[i] << ", output rate: " << kRates[j];
SCOPED_TRACE(ss.str());
if (ValidRates(kRates[i], kRates[j])) {
size_t in_length = static_cast<size_t>(kRates[i] / 100);
size_t out_length = 0;
EXPECT_EQ(0, rs_.Reset(kRates[i], kRates[j], kChannels));
EXPECT_EQ(
0, rs_.Push(data_in_, in_length, data_out_, kDataSize, out_length));
EXPECT_EQ(static_cast<size_t>(kRates[j] / 100), out_length);
} else {
EXPECT_EQ(-1, rs_.Reset(kRates[i], kRates[j], kChannels));
}
}
}
}
TEST_F(ResamplerTest, Stereo) {
const int kChannels = 2;
for (size_t i = 0; i < kRatesSize; ++i) {
for (size_t j = 0; j < kRatesSize; ++j) {
StringBuilder ss;
ss << "Input rate: " << kRates[i] << ", output rate: " << kRates[j];
SCOPED_TRACE(ss.str());
if (ValidRates(kRates[i], kRates[j])) {
size_t in_length = static_cast<size_t>(kChannels * kRates[i] / 100);
size_t out_length = 0;
EXPECT_EQ(0, rs_.Reset(kRates[i], kRates[j], kChannels));
EXPECT_EQ(
0, rs_.Push(data_in_, in_length, data_out_, kDataSize, out_length));
EXPECT_EQ(static_cast<size_t>(kChannels * kRates[j] / 100), out_length);
} else {
EXPECT_EQ(-1, rs_.Reset(kRates[i], kRates[j], kChannels));
}
}
}
}
// Try multiple resets between a few supported and unsupported rates.
TEST_F(ResamplerTest, MultipleResets) {
constexpr size_t kNumChanges = 5;
constexpr std::array<int, kNumChanges> kInRates = {
{8000, 44000, 44000, 32000, 32000}};
constexpr std::array<int, kNumChanges> kOutRates = {
{16000, 48000, 48000, 16000, 16000}};
constexpr std::array<int, kNumChanges> kNumChannels = {{2, 2, 2, 2, 1}};
for (size_t i = 0; i < kNumChanges; ++i) {
ResetIfNeededAndPush(kInRates[i], kOutRates[i], kNumChannels[i]);
}
}
} // namespace
} // namespace webrtc
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