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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 "utils/buffer_crossfader.h"
#include "third_party/googletest/googletest/include/gtest/gtest.h"
#include "base/audio_buffer.h"
#include "base/constants_and_types.h"
#include "base/logging.h"
namespace vraudio {
namespace {
// Tests that the linear crossfade is correctly applied to an input pair.
TEST(BufferCrossfaderTest, ApplyLinearCrossfadeTest) {
const size_t kNumFrames = 5;
const size_t kTestValue = 1.0f;
// Initialize input buffers.
AudioBuffer input_fade_in(kNumMonoChannels, kNumFrames);
AudioBuffer input_fade_out(kNumMonoChannels, kNumFrames);
for (size_t i = 0; i < kNumFrames; ++i) {
input_fade_in[0][i] = kTestValue;
input_fade_out[0][i] = kTestValue;
}
// Initialize output buffer.
AudioBuffer output(kNumMonoChannels, kNumFrames);
output.Clear();
// Initialize a new crossfader and apply linear crossfade.
BufferCrossfader crossfader(kNumFrames);
crossfader.ApplyLinearCrossfade(input_fade_in, input_fade_out, &output);
// Verify that the output buffer is correctly filled in as expected.
for (size_t i = 0; i < kNumFrames; ++i) {
EXPECT_FLOAT_EQ(kTestValue, output[0][i]);
}
}
} // namespace
} // namespace vraudio
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