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/*
* Copyright (c) 2021 Arm Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* 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 "Wav2LetterMfcc.hpp"
#include <algorithm>
#include <catch.hpp>
#include <limits>
/* First 512 samples from itellyou.wav. */
const std::vector<int16_t> testWav1 = std::vector<int16_t> {
-3,0,1,-1,2,3,-2,2,
1,-2,0,3,-1,8,3,2,
-1,-1,2,7,3,5,6,6,
6,12,5,6,3,3,5,4,
4,6,7,7,7,3,7,2,
8,4,4,2,-4,-1,-1,-4,
2,1,-1,-4,0,-7,-6,-2,
-5,1,-5,-1,-7,-3,-3,-7,
0,-3,3,-5,0,1,-2,-2,
-3,-3,-7,-3,-2,-6,-5,-8,
-2,-8,4,-9,-4,-9,-5,-5,
-3,-9,-3,-9,-1,-7,-4,1,
-3,2,-8,-4,-4,-5,1,-3,
-1,0,-1,-2,-3,-2,-4,-1,
1,-1,3,0,3,2,0,0,
0,-3,1,1,0,8,3,4,
1,5,6,4,7,3,3,0,
3,6,7,6,4,5,9,9,
5,5,8,1,6,9,6,6,
7,1,8,1,5,0,5,5,
0,3,2,7,2,-3,3,0,
3,0,0,0,2,0,-1,-1,
-2,-3,-8,0,1,0,-3,-3,
-3,-2,-3,-3,-4,-6,-2,-8,
-9,-4,-1,-5,-3,-3,-4,-3,
-6,3,0,-1,-2,-9,-4,-2,
2,-1,3,-5,-5,-2,0,-2,
0,-1,-3,1,-2,9,4,5,
2,2,1,0,-6,-2,0,0,
0,-1,4,-4,3,-7,-1,5,
-6,-1,-5,4,3,9,-2,1,
3,0,0,-2,1,2,1,1,
0,3,2,-1,3,-3,7,0,
0,3,2,2,-2,3,-2,2,
-3,4,-1,-1,-5,-1,-3,-2,
1,-1,3,2,4,1,2,-2,
0,2,7,0,8,-3,6,-3,
6,1,2,-3,-1,-1,-1,1,
-2,2,1,2,0,-2,3,-2,
3,-2,1,0,-3,-1,-2,-4,
-6,-5,-8,-1,-4,0,-3,-1,
-1,-1,0,-2,-3,-7,-1,0,
1,5,0,5,1,1,-3,0,
-6,3,-8,4,-8,6,-6,1,
-6,-2,-5,-6,0,-5,4,-1,
4,-2,1,2,1,0,-2,0,
0,2,-2,2,-5,2,0,-2,
1,-2,0,5,1,0,1,5,
0,8,3,2,2,0,5,-2,
3,1,0,1,0,-2,-1,-3,
1,-1,3,0,3,0,-2,-1,
-4,-4,-4,-1,-4,-4,-3,-6,
-3,-7,-3,-1,-2,0,-5,-4,
-7,-3,-2,-2,1,2,2,8,
5,4,2,4,3,5,0,3,
3,6,4,2,2,-2,4,-2,
3,3,2,1,1,4,-5,2,
-3,0,-1,1,-2,2,5,1,
4,2,3,1,-1,1,0,6,
0,-2,-1,1,-1,2,-5,-1,
-5,-1,-6,-3,-3,2,4,0,
-1,-5,3,-4,-1,-3,-4,1,
-4,1,-1,-1,0,-5,-4,-2,
-1,-1,-3,-7,-3,-3,4,4,
};
const std::vector<int16_t> testWav2 = std::vector<int16_t> (512, 0);
/* Golden mfcc output for testwav1. */
const std::vector<float> golden_mfcc_output_testWav1 {
-835.24603, 21.010452, 18.699404, 7.4338417, 19.028961, -5.401735, 6.4761047, -11.400679,
8.392709, 12.202361, 8.403276, -13.508412, -18.307348
};
/* Golden mfcc output for the all zero wav. */
const std::vector<float> golden_mfcc_output_testWav2 {
-1131.37085, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
arm::app::audio::Wav2LetterMFCC GetMFCCInstance()
{
const auto sampFreq = arm::app::audio::Wav2LetterMFCC::ms_defaultSamplingFreq;
const auto frameLenMs = 32;
const auto numMfccFeats = 13;
const auto frameLenSamples = sampFreq * frameLenMs * 0.001;
return arm::app::audio::Wav2LetterMFCC(numMfccFeats, frameLenSamples);
}
template <class T>
void TestQuantisedMFCC()
{
const auto quantScale = 0.1410219967365265;
const auto quantOffset = 11;
std::vector<T> mfccOutput = GetMFCCInstance().MfccComputeQuant<T>(testWav1, quantScale, quantOffset);
long min_val = std::numeric_limits<T>::min();
long max_val = std::numeric_limits<T>::max();
for (size_t i = 0; i < golden_mfcc_output_testWav1.size(); i++){
long TestWavMfcc = (std::lround((golden_mfcc_output_testWav1[i] / quantScale) + quantOffset));
T quantizedTestWavMfcc = static_cast<T>(std::max(min_val, std::min(TestWavMfcc, max_val)));
REQUIRE(quantizedTestWavMfcc == Approx(mfccOutput[i]).margin(2));
}
}
template void TestQuantisedMFCC<int8_t>();
template void TestQuantisedMFCC<uint8_t>();
template void TestQuantisedMFCC<int16_t>();
TEST_CASE("MFCC calculation")
{
hal_platform platform;
data_acq_module dataAcq;
data_psn_module dataPsn;
platform_timer timer;
/* Initialise the HAL and platform. */
hal_init(&platform, &dataAcq, &dataPsn, &timer);
hal_platform_init(&platform);
SECTION("FP32")
{
auto mfccOutput = GetMFCCInstance().MfccCompute(testWav1);
REQUIRE_THAT( mfccOutput, Catch::Approx( golden_mfcc_output_testWav1 ).margin(0.3) );
auto mfccOutput2 = GetMFCCInstance().MfccCompute(testWav2);
REQUIRE_THAT( mfccOutput2, Catch::Approx( golden_mfcc_output_testWav2 ).margin(0.001) );
}
SECTION("int8_t")
{
TestQuantisedMFCC<int8_t>();
}
SECTION("uint8_t")
{
TestQuantisedMFCC<uint8_t>();
}
SECTION("int16_t")
{
TestQuantisedMFCC<int16_t>();
}
}
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