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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.
*/
#include "modules/audio_coding/neteq/dsp_helper.h"
#include <cstdint>
#include "modules/audio_coding/neteq/audio_multi_vector.h"
#include "test/gtest.h"
namespace webrtc {
TEST(DspHelper, RampSignalArray) {
static const int kLen = 100;
int16_t input[kLen];
int16_t output[kLen];
// Fill input with 1000.
for (int i = 0; i < kLen; ++i) {
input[i] = 1000;
}
int start_factor = 0;
// Ramp from 0 to 1 (in Q14) over the array. Note that `increment` is in Q20,
// while the factor is in Q14, hence the shift by 6.
int increment = (16384 << 6) / kLen;
// Test first method.
int stop_factor =
DspHelper::RampSignal(input, kLen, start_factor, increment, output);
EXPECT_EQ(16383, stop_factor); // Almost reach 1 in Q14.
for (int i = 0; i < kLen; ++i) {
EXPECT_EQ(1000 * i / kLen, output[i]);
}
// Test second method. (Note that this modifies `input`.)
stop_factor = DspHelper::RampSignal(input, kLen, start_factor, increment);
EXPECT_EQ(16383, stop_factor); // Almost reach 1 in Q14.
for (int i = 0; i < kLen; ++i) {
EXPECT_EQ(1000 * i / kLen, input[i]);
}
}
TEST(DspHelper, RampSignalAudioMultiVector) {
static const int kLen = 100;
static const int kChannels = 5;
AudioMultiVector input(kChannels, kLen * 3);
// Fill input with 1000.
for (int i = 0; i < kLen * 3; ++i) {
for (int channel = 0; channel < kChannels; ++channel) {
input[channel][i] = 1000;
}
}
// We want to start ramping at `start_index` and keep ramping for `kLen`
// samples.
int start_index = kLen;
int start_factor = 0;
// Ramp from 0 to 1 (in Q14) in `kLen` samples. Note that `increment` is in
// Q20, while the factor is in Q14, hence the shift by 6.
int increment = (16384 << 6) / kLen;
int stop_factor =
DspHelper::RampSignal(&input, start_index, kLen, start_factor, increment);
EXPECT_EQ(16383, stop_factor); // Almost reach 1 in Q14.
// Verify that the first `kLen` samples are left untouched.
int i;
for (i = 0; i < kLen; ++i) {
for (int channel = 0; channel < kChannels; ++channel) {
EXPECT_EQ(1000, input[channel][i]);
}
}
// Verify that the next block of `kLen` samples are ramped.
for (; i < 2 * kLen; ++i) {
for (int channel = 0; channel < kChannels; ++channel) {
EXPECT_EQ(1000 * (i - kLen) / kLen, input[channel][i]);
}
}
// Verify the last `kLen` samples are left untouched.
for (; i < 3 * kLen; ++i) {
for (int channel = 0; channel < kChannels; ++channel) {
EXPECT_EQ(1000, input[channel][i]);
}
}
}
} // namespace webrtc
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