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/*
* Copyright (c) 2013 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 "webrtc/modules/audio_processing/transient/dyadic_decimator.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace webrtc {
static const size_t kEvenBufferLength = 6;
static const size_t kOddBufferLength = 5;
static const size_t kOutBufferLength = 3;
int16_t const test_buffer_even_len[] = {0, 1, 2, 3, 4, 5};
int16_t const test_buffer_odd_len[] = {0, 1, 2, 3, 4};
int16_t test_buffer_out[kOutBufferLength];
TEST(DyadicDecimatorTest, GetOutLengthToDyadicDecimate) {
EXPECT_EQ(3u, GetOutLengthToDyadicDecimate(6, false));
EXPECT_EQ(3u, GetOutLengthToDyadicDecimate(6, true));
EXPECT_EQ(3u, GetOutLengthToDyadicDecimate(5, false));
EXPECT_EQ(2u, GetOutLengthToDyadicDecimate(5, true));
}
TEST(DyadicDecimatorTest, DyadicDecimateErrorValues) {
size_t out_samples = 0;
out_samples = DyadicDecimate(static_cast<int16_t*>(NULL),
kEvenBufferLength,
false, // Even sequence.
test_buffer_out,
kOutBufferLength);
EXPECT_EQ(0u, out_samples);
out_samples = DyadicDecimate(test_buffer_even_len,
kEvenBufferLength,
false, // Even sequence.
static_cast<int16_t*>(NULL),
kOutBufferLength);
EXPECT_EQ(0u, out_samples);
// Less than required |out_length|.
out_samples = DyadicDecimate(test_buffer_even_len,
kEvenBufferLength,
false, // Even sequence.
test_buffer_out,
2);
EXPECT_EQ(0u, out_samples);
}
TEST(DyadicDecimatorTest, DyadicDecimateEvenLengthEvenSequence) {
size_t expected_out_samples =
GetOutLengthToDyadicDecimate(kEvenBufferLength, false);
size_t out_samples = DyadicDecimate(test_buffer_even_len,
kEvenBufferLength,
false, // Even sequence.
test_buffer_out,
kOutBufferLength);
EXPECT_EQ(expected_out_samples, out_samples);
EXPECT_EQ(0, test_buffer_out[0]);
EXPECT_EQ(2, test_buffer_out[1]);
EXPECT_EQ(4, test_buffer_out[2]);
}
TEST(DyadicDecimatorTest, DyadicDecimateEvenLengthOddSequence) {
size_t expected_out_samples =
GetOutLengthToDyadicDecimate(kEvenBufferLength, true);
size_t out_samples = DyadicDecimate(test_buffer_even_len,
kEvenBufferLength,
true, // Odd sequence.
test_buffer_out,
kOutBufferLength);
EXPECT_EQ(expected_out_samples, out_samples);
EXPECT_EQ(1, test_buffer_out[0]);
EXPECT_EQ(3, test_buffer_out[1]);
EXPECT_EQ(5, test_buffer_out[2]);
}
TEST(DyadicDecimatorTest, DyadicDecimateOddLengthEvenSequence) {
size_t expected_out_samples =
GetOutLengthToDyadicDecimate(kOddBufferLength, false);
size_t out_samples = DyadicDecimate(test_buffer_odd_len,
kOddBufferLength,
false, // Even sequence.
test_buffer_out,
kOutBufferLength);
EXPECT_EQ(expected_out_samples, out_samples);
EXPECT_EQ(0, test_buffer_out[0]);
EXPECT_EQ(2, test_buffer_out[1]);
EXPECT_EQ(4, test_buffer_out[2]);
}
TEST(DyadicDecimatorTest, DyadicDecimateOddLengthOddSequence) {
size_t expected_out_samples =
GetOutLengthToDyadicDecimate(kOddBufferLength, true);
size_t out_samples = DyadicDecimate(test_buffer_odd_len,
kOddBufferLength,
true, // Odd sequence.
test_buffer_out,
kOutBufferLength);
EXPECT_EQ(expected_out_samples, out_samples);
EXPECT_EQ(1, test_buffer_out[0]);
EXPECT_EQ(3, test_buffer_out[1]);
}
} // namespace webrtc
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