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Diffstat (limited to 'externals/oboe/tests/testResampler.cpp')
| -rw-r--r-- | externals/oboe/tests/testResampler.cpp | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/externals/oboe/tests/testResampler.cpp b/externals/oboe/tests/testResampler.cpp deleted file mode 100644 index 5518829bbd..0000000000 --- a/externals/oboe/tests/testResampler.cpp +++ /dev/null @@ -1,225 +0,0 @@ -/* - * Copyright 2022 The Android Open Source Project - * - * 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. - */ - -/* - * Test FlowGraph - */ - -#include "math.h" -#include "stdio.h" - -#include <gtest/gtest.h> -#include <oboe/Oboe.h> - -#include "flowgraph/resampler/MultiChannelResampler.h" - -using namespace oboe::resampler; - -// Measure zero crossings. -static int32_t countZeroCrossingsWithHysteresis(float *input, int32_t numSamples) { - const float kHysteresisLevel = 0.25f; - int zeroCrossingCount = 0; - int state = 0; // can be -1, 0, +1 - for (int i = 0; i < numSamples; i++) { - if (input[i] >= kHysteresisLevel) { - if (state < 0) { - zeroCrossingCount++; - } - state = 1; - } else if (input[i] <= -kHysteresisLevel) { - if (state > 0) { - zeroCrossingCount++; - } - state = -1; - } - } - return zeroCrossingCount; -} - -static constexpr int kChannelCount = 1; - -/** - * Convert a sine wave and then look for glitches. - * Glitches have a high value in the second derivative. - */ -static void checkResampler(int32_t sourceRate, int32_t sinkRate, - MultiChannelResampler::Quality quality) { - const int kNumOutputSamples = 10000; - const double framesPerCycle = 81.379; // target output period - - int numInputSamples = kNumOutputSamples * sourceRate / sinkRate; - - std::unique_ptr<float[]> inputBuffer = std::make_unique<float[]>(numInputSamples); - std::unique_ptr<float[]> outputBuffer = std::make_unique<float[]>(kNumOutputSamples); - - // Generate a sine wave for input. - const double kPhaseIncrement = 2.0 * sinkRate / (framesPerCycle * sourceRate); - double phase = 0.0; - for (int i = 0; i < numInputSamples; i++) { - inputBuffer[i] = sin(phase * M_PI); - phase += kPhaseIncrement; - while (phase > 1.0) { - phase -= 2.0; - } - } - int sourceZeroCrossingCount = countZeroCrossingsWithHysteresis(inputBuffer.get(), numInputSamples); - - // Use a MultiChannelResampler to convert from the sourceRate to the sinkRate. - std::unique_ptr<MultiChannelResampler> mcResampler; - mcResampler.reset(MultiChannelResampler::make(kChannelCount, - sourceRate, - sinkRate, - quality)); - int inputFramesLeft = numInputSamples; - int numRead = 0; - float *input = inputBuffer.get(); // for iteration - float *output = outputBuffer.get(); - while (inputFramesLeft > 0) { - if (mcResampler->isWriteNeeded()) { - mcResampler->writeNextFrame(input); - input++; - inputFramesLeft--; - } else { - mcResampler->readNextFrame(output); - output++; - numRead++; - } - } - - // Flush out remaining frames from the flowgraph - while (!mcResampler->isWriteNeeded()) { - mcResampler->readNextFrame(output); - output++; - numRead++; - } - - ASSERT_LE(numRead, kNumOutputSamples); - // Some frames are lost priming the FIR filter. - const int kMaxAlgorithmicFrameLoss = 5; - EXPECT_GT(numRead, kNumOutputSamples - kMaxAlgorithmicFrameLoss); - - int sinkZeroCrossingCount = countZeroCrossingsWithHysteresis(outputBuffer.get(), numRead); - // The sine wave may be cut off partially. This may cause multiple crossing - // differences when upsampling. - const int kMaxZeroCrossingDelta = std::max(sinkRate / sourceRate / 2, 1); - EXPECT_LE(abs(sourceZeroCrossingCount - sinkZeroCrossingCount), kMaxZeroCrossingDelta); - - // Detect glitches by looking for spikes in the second derivative. - output = outputBuffer.get(); - float previousValue = output[0]; - float previousSlope = output[1] - output[0]; - for (int i = 0; i < numRead; i++) { - float slope = output[i] - previousValue; - float slopeDelta = fabs(slope - previousSlope); - // Skip a few samples because there are often some steep slope changes at the beginning. - if (i > 10) { - EXPECT_LT(slopeDelta, 0.1); - } - previousValue = output[i]; - previousSlope = slope; - } - -#if 0 - // Save to disk for inspection. - FILE *fp = fopen( "/sdcard/Download/src_float_out.raw" , "wb" ); - fwrite(outputBuffer.get(), sizeof(float), numRead, fp ); - fclose(fp); -#endif -} - - -TEST(test_resampler, resampler_scan_all) { - const int rates[] = {8000, 11025, 22050, 32000, 44100, 48000, 64000, 88200, 96000}; - const MultiChannelResampler::Quality qualities[] = - { - MultiChannelResampler::Quality::Fastest, - MultiChannelResampler::Quality::Low, - MultiChannelResampler::Quality::Medium, - MultiChannelResampler::Quality::High, - MultiChannelResampler::Quality::Best - }; - for (int srcRate : rates) { - for (int destRate : rates) { - for (auto quality : qualities) { - if (srcRate != destRate) { - checkResampler(srcRate, destRate, quality); - } - } - } - } -} - -TEST(test_resampler, resampler_8000_11025_best) { - checkResampler(8000, 11025, MultiChannelResampler::Quality::Best); -} -TEST(test_resampler, resampler_8000_48000_best) { - checkResampler(8000, 48000, MultiChannelResampler::Quality::Best); -} - -TEST(test_resampler, resampler_8000_44100_best) { - checkResampler(8000, 44100, MultiChannelResampler::Quality::Best); -} - -TEST(test_resampler, resampler_11025_24000_best) { - checkResampler(11025, 24000, MultiChannelResampler::Quality::Best); -} - -TEST(test_resampler, resampler_11025_48000_fastest) { - checkResampler(11025, 48000, MultiChannelResampler::Quality::Fastest); -} -TEST(test_resampler, resampler_11025_48000_low) { - checkResampler(11025, 48000, MultiChannelResampler::Quality::Low); -} -TEST(test_resampler, resampler_11025_48000_medium) { - checkResampler(11025, 48000, MultiChannelResampler::Quality::Medium); -} -TEST(test_resampler, resampler_11025_48000_high) { - checkResampler(11025, 48000, MultiChannelResampler::Quality::High); -} - -TEST(test_resampler, resampler_11025_48000_best) { - checkResampler(11025, 48000, MultiChannelResampler::Quality::Best); -} - -TEST(test_resampler, resampler_11025_44100_best) { - checkResampler(11025, 44100, MultiChannelResampler::Quality::Best); -} - -TEST(test_resampler, resampler_11025_88200_best) { - checkResampler(11025, 88200, MultiChannelResampler::Quality::Best); -} - -TEST(test_resampler, resampler_16000_48000_best) { - checkResampler(16000, 48000, MultiChannelResampler::Quality::Best); -} - -TEST(test_resampler, resampler_44100_48000_low) { - checkResampler(44100, 48000, MultiChannelResampler::Quality::Low); -} -TEST(test_resampler, resampler_44100_48000_best) { - checkResampler(44100, 48000, MultiChannelResampler::Quality::Best); -} - -// Look for glitches when downsampling. -TEST(test_resampler, resampler_48000_11025_best) { - checkResampler(48000, 11025, MultiChannelResampler::Quality::Best); -} -TEST(test_resampler, resampler_48000_44100_best) { - checkResampler(48000, 44100, MultiChannelResampler::Quality::Best); -} -TEST(test_resampler, resampler_44100_11025_best) { - checkResampler(44100, 11025, MultiChannelResampler::Quality::Best); -} |