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/*
Copyright 2018 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS-IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "dsp/gain_mixer.h"
#include <iterator>
#include <vector>
#include "third_party/googletest/googletest/include/gtest/gtest.h"
#include "base/constants_and_types.h"
#include "utils/planar_interleaved_conversion.h"
namespace vraudio {
namespace {
const int kId1 = 0;
const int kId2 = 1;
// Number of frames per output buffer.
const size_t kFramesPerBuffer = 3;
// Sample mono input data, gains, and the corresponding output data.
const float kGain1 = 0.5f;
const float kGain2 = 2.0f;
const float kInput1[kFramesPerBuffer] = {0.2f, 0.4f, 0.6f};
const float kInput2[kFramesPerBuffer] = {0.5f, 1.0f, 1.5f};
const float kOutput[kFramesPerBuffer] = {1.1f, 2.2f, 3.3f};
// Tests that the gain mixer returns null output if no input has been added.
TEST(MixerTest, EmptyInputTest) {
GainMixer gain_mixer(kNumMonoChannels, kFramesPerBuffer);
const AudioBuffer* output = gain_mixer.GetOutput();
EXPECT_TRUE(output == nullptr);
}
// Mono processing test with two inputs. Tests the mixed output buffer against
// the manually computed output data.
TEST(GainMixerTest, ProcessTest) {
GainMixer gain_mixer(kNumMonoChannels, kFramesPerBuffer);
// Initialize input buffers.
AudioBuffer input1(kNumMonoChannels, kFramesPerBuffer);
input1.set_source_id(kId1);
FillAudioBuffer(std::begin(kInput1), kFramesPerBuffer, kNumMonoChannels,
&input1);
AudioBuffer input2(kNumMonoChannels, kFramesPerBuffer);
input2.set_source_id(kId2);
FillAudioBuffer(std::begin(kInput2), kFramesPerBuffer, kNumMonoChannels,
&input2);
// Initialize gain vectors.
const std::vector<float> kGainVector1(1, kGain1);
const std::vector<float> kGainVector2(1, kGain2);
// Add the input buffers to the |GainMixer| (process multiple times so the
// gains have reached steady state.
const AudioBuffer* output = nullptr;
for (size_t iterations = 0; iterations < kUnitRampLength; ++iterations) {
gain_mixer.Reset();
gain_mixer.AddInput(input1, kGainVector1);
gain_mixer.AddInput(input2, kGainVector2);
// Get the processed output (should contain the pre-computed output data).
output = gain_mixer.GetOutput();
}
EXPECT_FALSE(output == nullptr);
EXPECT_EQ(output->num_channels(), kNumMonoChannels);
EXPECT_EQ(output->num_frames(), kFramesPerBuffer);
for (size_t i = 0; i < kFramesPerBuffer; ++i) {
EXPECT_NEAR((*output)[0][i], kOutput[i], kEpsilonFloat);
}
}
// Reset test for the |GainMixer| with single input at a time. First, adds an
// input buffer, resets the |GainMixer|. Then, adds another input buffer and
// tests the final output buffer against the data of the last added input buffer
// to verify if the system has been successfully reset.
TEST(GainMixerTest, ResetTest) {
GainMixer gain_mixer(kNumMonoChannels, kFramesPerBuffer);
// Initialize input buffers.
AudioBuffer input1(kNumMonoChannels, kFramesPerBuffer);
input1.set_source_id(kId1);
FillAudioBuffer(std::begin(kInput1), kFramesPerBuffer, kNumMonoChannels,
&input1);
AudioBuffer input2(kNumMonoChannels, kFramesPerBuffer);
input2.set_source_id(kId2);
FillAudioBuffer(std::begin(kInput2), kFramesPerBuffer, kNumMonoChannels,
&input2);
// Initialize gain vectors.
const std::vector<float> kGainVector1(1, kGain1);
const std::vector<float> kGainVector2(1, kGain2);
// Add the first input buffer to the |GainMixer|.
gain_mixer.AddInput(input1, kGainVector1);
// Reset the accumulator (and release the buffer).
gain_mixer.Reset();
// Add the second input buffers to the |GainMixer|.
gain_mixer.AddInput(input2, kGainVector2);
// Get the output (should only contain the second input).
const AudioBuffer* output = gain_mixer.GetOutput();
EXPECT_FALSE(output == nullptr);
EXPECT_EQ(output->num_channels(), kNumMonoChannels);
EXPECT_EQ(output->num_frames(), kFramesPerBuffer);
for (size_t i = 0; i < kFramesPerBuffer; ++i) {
EXPECT_NEAR((*output)[0][i], kInput2[i] * kGain2, kEpsilonFloat);
}
}
// Tests that gains are correctly applied for multiple channels.
TEST(GainMixerTest, MultiChannelTest) {
const std::vector<float> kGains = {0.1f, -0.2f};
const std::vector<float> kInputChannel = {10.0f, 10.0f, 10.0f};
GainMixer gain_mixer(kGains.size(), kFramesPerBuffer);
// Initialize input buffer.
AudioBuffer input(kGains.size(), kInputChannel.size());
for (size_t i = 0; i < kGains.size(); ++i) {
input[i] = kInputChannel;
}
const AudioBuffer* output = nullptr;
for (size_t iterations = 0; iterations < kUnitRampLength; ++iterations) {
gain_mixer.Reset();
gain_mixer.AddInput(input, kGains);
output = gain_mixer.GetOutput();
}
EXPECT_FALSE(output == nullptr);
EXPECT_EQ(output->num_channels(), kGains.size());
EXPECT_EQ(output->num_frames(), kFramesPerBuffer);
for (size_t channel = 0; channel < kGains.size(); ++channel) {
for (size_t i = 0; i < kInputChannel.size(); ++i) {
EXPECT_NEAR((*output)[channel][i], kInputChannel[i] * kGains[channel],
kEpsilonFloat);
}
}
}
// Tests that gains are correctly applied for a mono input buffer across a
// multichannel output buffer.
TEST(GainMixerTest, MonoChannelInputTest) {
const std::vector<float> kGains = {2.0f, -3.0f};
const std::vector<float> kInputChannel = {10.0f, 10.0f, 10.0f};
GainMixer gain_mixer(kGains.size(), kInputChannel.size());
// Create a mono input buffer.
AudioBuffer input(kNumMonoChannels, kInputChannel.size());
AudioBuffer::Channel* input_channel = &input[0];
*input_channel = kInputChannel;
const AudioBuffer* output = nullptr;
for (size_t iterations = 0; iterations < kUnitRampLength; ++iterations) {
gain_mixer.Reset();
gain_mixer.AddInputChannel(*input_channel, kId1, kGains);
output = gain_mixer.GetOutput();
}
EXPECT_FALSE(output == nullptr);
EXPECT_EQ(output->num_channels(), kGains.size());
EXPECT_EQ(output->num_frames(), kFramesPerBuffer);
for (size_t channel = 0; channel < kGains.size(); ++channel) {
for (size_t i = 0; i < kInputChannel.size(); ++i) {
EXPECT_NEAR((*output)[channel][i], kInputChannel[i] * kGains[channel],
kEpsilonFloat);
}
}
}
} // namespace
} // namespace vraudio
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