From 546734b3ab577d46afe863515104a062e88a109b Mon Sep 17 00:00:00 2001 From: Andy Hung Date: Tue, 1 Apr 2014 18:31:42 -0700 Subject: Add tests directory for AudioFlinger Native tests for audio resampler through gtest framework. Change-Id: Ia340ca51f9b9b78d67e03e3541e4462b98578c95 --- services/audioflinger/tests/Android.mk | 31 ++ .../tests/build_and_run_all_unit_tests.sh | 22 + services/audioflinger/tests/resampler_tests.cpp | 471 +++++++++++++++++++++ services/audioflinger/tests/run_all_unit_tests.sh | 11 + 4 files changed, 535 insertions(+) create mode 100644 services/audioflinger/tests/Android.mk create mode 100755 services/audioflinger/tests/build_and_run_all_unit_tests.sh create mode 100644 services/audioflinger/tests/resampler_tests.cpp create mode 100755 services/audioflinger/tests/run_all_unit_tests.sh (limited to 'services/audioflinger/tests') diff --git a/services/audioflinger/tests/Android.mk b/services/audioflinger/tests/Android.mk new file mode 100644 index 0000000..874f18f --- /dev/null +++ b/services/audioflinger/tests/Android.mk @@ -0,0 +1,31 @@ +# Build the unit tests for audioflinger + +LOCAL_PATH:= $(call my-dir) +include $(CLEAR_VARS) + +LOCAL_SHARED_LIBRARIES := \ + liblog \ + libutils \ + libcutils \ + libstlport \ + libaudioutils \ + libaudioresampler + +LOCAL_STATIC_LIBRARIES := \ + libgtest \ + libgtest_main + +LOCAL_C_INCLUDES := \ + bionic \ + bionic/libstdc++/include \ + external/gtest/include \ + external/stlport/stlport \ + frameworks/av/services/audioflinger + +LOCAL_SRC_FILES := \ + resampler_tests.cpp + +LOCAL_MODULE := resampler_tests +LOCAL_MODULE_TAGS := tests + +include $(BUILD_EXECUTABLE) diff --git a/services/audioflinger/tests/build_and_run_all_unit_tests.sh b/services/audioflinger/tests/build_and_run_all_unit_tests.sh new file mode 100755 index 0000000..2c453b0 --- /dev/null +++ b/services/audioflinger/tests/build_and_run_all_unit_tests.sh @@ -0,0 +1,22 @@ +#!/bin/bash + +if [ -z "$ANDROID_BUILD_TOP" ]; then + echo "Android build environment not set" + exit -1 +fi + +# ensure we have mm +. $ANDROID_BUILD_TOP/build/envsetup.sh + +pushd $ANDROID_BUILD_TOP/frameworks/av/services/audioflinger/ +pwd +mm + +echo "waiting for device" +adb root && adb wait-for-device remount +adb push $OUT/system/lib/libaudioresampler.so /system/lib +adb push $OUT/system/bin/resampler_tests /system/bin + +sh $ANDROID_BUILD_TOP/frameworks/av/services/audioflinger/tests/run_all_unit_tests.sh + +popd diff --git a/services/audioflinger/tests/resampler_tests.cpp b/services/audioflinger/tests/resampler_tests.cpp new file mode 100644 index 0000000..8f9c270 --- /dev/null +++ b/services/audioflinger/tests/resampler_tests.cpp @@ -0,0 +1,471 @@ +/* + * Copyright (C) 2014 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. + */ + +//#define LOG_NDEBUG 0 +#define LOG_TAG "audioflinger_resampler_tests" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "AudioResampler.h" + +#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) + +template +struct is_same +{ + static const bool value = false; +}; + +template +struct is_same // partial specialization +{ + static const bool value = true; +}; + +template +static inline T convertValue(double val) +{ + if (is_same::value) { + return floor(val * 32767.0 + 0.5); + } else if (is_same::value) { + return floor(val * (1UL<<31) + 0.5); + } + return val; // assume float or double +} + +/* Creates a type-independent audio buffer provider from + * a buffer base address, size, framesize, and input increment array. + * + * No allocation or deallocation of the provided buffer is done. + */ +class TestProvider : public android::AudioBufferProvider { +public: + TestProvider(const void* addr, size_t frames, size_t frameSize, + const std::vector& inputIncr) + : mAddr(addr), + mNumFrames(frames), + mFrameSize(frameSize), + mNextFrame(0), mUnrel(0), mInputIncr(inputIncr), mNextIdx(0) + { + } + + virtual android::status_t getNextBuffer(Buffer* buffer, int64_t pts __unused = kInvalidPTS ) + { + size_t requestedFrames = buffer->frameCount; + if (requestedFrames > mNumFrames - mNextFrame) { + buffer->frameCount = mNumFrames - mNextFrame; + } + if (!mInputIncr.empty()) { + size_t provided = mInputIncr[mNextIdx++]; + ALOGV("getNextBuffer() mValue[%d]=%u not %u", + mNextIdx-1, provided, buffer->frameCount); + if (provided < buffer->frameCount) { + buffer->frameCount = provided; + } + if (mNextIdx >= mInputIncr.size()) { + mNextIdx = 0; + } + } + ALOGV("getNextBuffer() requested %u frames out of %u frames available" + " and returned %u frames\n", + requestedFrames, mNumFrames - mNextFrame, buffer->frameCount); + mUnrel = buffer->frameCount; + if (buffer->frameCount > 0) { + buffer->raw = (char *)mAddr + mFrameSize * mNextFrame; + return android::NO_ERROR; + } else { + buffer->raw = NULL; + return android::NOT_ENOUGH_DATA; + } + } + + virtual void releaseBuffer(Buffer* buffer) + { + if (buffer->frameCount > mUnrel) { + ALOGE("releaseBuffer() released %u frames but only %u available " + "to release\n", buffer->frameCount, mUnrel); + mNextFrame += mUnrel; + mUnrel = 0; + } else { + + ALOGV("releaseBuffer() released %u frames out of %u frames available " + "to release\n", buffer->frameCount, mUnrel); + mNextFrame += buffer->frameCount; + mUnrel -= buffer->frameCount; + } + buffer->frameCount = 0; + buffer->raw = NULL; + } + + void reset() + { + mNextFrame = 0; + } + + size_t getNumFrames() + { + return mNumFrames; + } + + void setIncr(const std::vector inputIncr) + { + mNextIdx = 0; + mInputIncr = inputIncr; + } + +protected: + const void* mAddr; // base address + size_t mNumFrames; // total frames + int mFrameSize; // frame size (# channels * bytes per sample) + size_t mNextFrame; // index of next frame to provide + size_t mUnrel; // number of frames not yet released + std::vector mInputIncr; // number of frames provided per call + size_t mNextIdx; // index of next entry in mInputIncr to use +}; + +/* Creates a buffer filled with a sine wave. + * + * Returns a pair consisting of the sine signal buffer and the number of frames. + * The caller must delete[] the buffer when no longer needed (no shared_ptr<>). + */ +template +static std::pair createSine(size_t channels, + double freq, double samplingRate, double time) +{ + double tscale = 1. / samplingRate; + size_t frames = static_cast(samplingRate * time); + T* buffer = new T[frames * channels]; + for (size_t i = 0; i < frames; ++i) { + double t = i * tscale; + double y = sin(2. * M_PI * freq * t); + T yt = convertValue(y); + + for (size_t j = 0; j < channels; ++j) { + buffer[i*channels + j] = yt / (j + 1); + } + } + return std::make_pair(buffer, frames); +} + +/* Creates a buffer filled with a chirp signal (a sine wave sweep). + * + * Returns a pair consisting of the chirp signal buffer and the number of frames. + * The caller must delete[] the buffer when no longer needed (no shared_ptr<>). + * + * When creating the Chirp, note that the frequency is the true sinusoidal + * frequency not the sampling rate. + * + * http://en.wikipedia.org/wiki/Chirp + */ +template +static std::pair createChirp(size_t channels, + double minfreq, double maxfreq, double samplingRate, double time) +{ + double tscale = 1. / samplingRate; + size_t frames = static_cast(samplingRate * time); + T *buffer = new T[frames * channels]; + // note the chirp constant k has a divide-by-two. + double k = (maxfreq - minfreq) / (2. * time); + for (size_t i = 0; i < frames; ++i) { + double t = i * tscale; + double y = sin(2. * M_PI * (k * t + minfreq) * t); + T yt = convertValue(y); + + for (size_t j = 0; j < channels; ++j) { + buffer[i*channels + j] = yt / (j + 1); + } + } + return std::make_pair(buffer, frames); +} + +/* This derived class creates a buffer provider of datatype T, + * consisting of an input signal, e.g. from createChirp(). + * The number of frames can be obtained from the base class + * TestProvider::getNumFrames(). + */ +template +class SignalProvider : public TestProvider { +public: + SignalProvider(const std::pair& bufferInfo, size_t channels, + const std::vector& values) + : TestProvider(bufferInfo.first, bufferInfo.second, channels * sizeof(T), values), + mManagedPtr(bufferInfo.first) + { + } + + virtual ~SignalProvider() + { + delete[] mManagedPtr; + } + +protected: + T* mManagedPtr; +}; + +void resample(void *output, size_t outputFrames, const std::vector &outputIncr, + android::AudioBufferProvider *provider, android::AudioResampler *resampler) +{ + for (size_t i = 0, j = 0; i < outputFrames; ) { + size_t thisFrames = outputIncr[j++]; + if (j >= outputIncr.size()) { + j = 0; + } + if (thisFrames == 0 || thisFrames > outputFrames - i) { + thisFrames = outputFrames - i; + } + resampler->resample((int32_t*) output + 2*i, thisFrames, provider); + i += thisFrames; + } +} + +void buffercmp(const void *reference, const void *test, + size_t outputFrameSize, size_t outputFrames) +{ + for (size_t i = 0; i < outputFrames; ++i) { + int check = memcmp((const char*)reference + i * outputFrameSize, + (const char*)test + i * outputFrameSize, outputFrameSize); + if (check) { + ALOGE("Failure at frame %d", i); + ASSERT_EQ(check, 0); /* fails */ + } + } +} + +void testBufferIncrement(size_t channels, unsigned inputFreq, unsigned outputFreq, + enum android::AudioResampler::src_quality quality) +{ + // create the provider + std::vector inputIncr; + SignalProvider provider(createChirp(channels, + 0., outputFreq/2., outputFreq, outputFreq/2000.), + channels, inputIncr); + + // calculate the output size + size_t outputFrames = ((int64_t) provider.getNumFrames() * outputFreq) / inputFreq; + size_t outputFrameSize = 2 * sizeof(int32_t); + size_t outputSize = outputFrameSize * outputFrames; + outputSize &= ~7; + + // create the resampler + const int volumePrecision = 12; /* typical unity gain */ + android::AudioResampler* resampler; + + resampler = android::AudioResampler::create(16, channels, outputFreq, quality); + resampler->setSampleRate(inputFreq); + resampler->setVolume(1 << volumePrecision, 1 << volumePrecision); + + // set up the reference run + std::vector refIncr; + refIncr.push_back(outputFrames); + void* reference = malloc(outputSize); + resample(reference, outputFrames, refIncr, &provider, resampler); + + provider.reset(); + +#if 0 + /* this test will fail - API interface issue: reset() does not clear internal buffers */ + resampler->reset(); +#else + delete resampler; + resampler = android::AudioResampler::create(16, channels, outputFreq, quality); + resampler->setSampleRate(inputFreq); + resampler->setVolume(1 << volumePrecision, 1 << volumePrecision); +#endif + + // set up the test run + std::vector outIncr; + outIncr.push_back(1); + outIncr.push_back(2); + outIncr.push_back(3); + void* test = malloc(outputSize); + resample(test, outputFrames, outIncr, &provider, resampler); + + // check + buffercmp(reference, test, outputFrameSize, outputFrames); + + free(reference); + free(test); + delete resampler; +} + +template +inline double sqr(T v) +{ + double dv = static_cast(v); + return dv * dv; +} + +template +double signalEnergy(T *start, T *end, unsigned stride) +{ + double accum = 0; + + for (T *p = start; p < end; p += stride) { + accum += sqr(*p); + } + unsigned count = (end - start + stride - 1) / stride; + return accum / count; +} + +void testStopbandDownconversion(size_t channels, + unsigned inputFreq, unsigned outputFreq, + unsigned passband, unsigned stopband, + enum android::AudioResampler::src_quality quality) +{ + // create the provider + std::vector inputIncr; + SignalProvider provider(createChirp(channels, + 0., inputFreq/2., inputFreq, inputFreq/2000.), + channels, inputIncr); + + // calculate the output size + size_t outputFrames = ((int64_t) provider.getNumFrames() * outputFreq) / inputFreq; + size_t outputFrameSize = 2 * sizeof(int32_t); + size_t outputSize = outputFrameSize * outputFrames; + outputSize &= ~7; + + // create the resampler + const int volumePrecision = 12; /* typical unity gain */ + android::AudioResampler* resampler; + + resampler = android::AudioResampler::create(16, channels, outputFreq, quality); + resampler->setSampleRate(inputFreq); + resampler->setVolume(1 << volumePrecision, 1 << volumePrecision); + + // set up the reference run + std::vector refIncr; + refIncr.push_back(outputFrames); + void* reference = malloc(outputSize); + resample(reference, outputFrames, refIncr, &provider, resampler); + + int32_t *out = reinterpret_cast(reference); + + // check signal energy in passband + const unsigned passbandFrame = passband * outputFreq / 1000.; + const unsigned stopbandFrame = stopband * outputFreq / 1000.; + + // check each channel separately + for (size_t i = 0; i < channels; ++i) { + double passbandEnergy = signalEnergy(out, out + passbandFrame * channels, channels); + double stopbandEnergy = signalEnergy(out + stopbandFrame * channels, + out + outputFrames * channels, channels); + double dbAtten = -10. * log10(stopbandEnergy / passbandEnergy); + ASSERT_GT(dbAtten, 60.); + +#if 0 + // internal verification + printf("if:%d of:%d pbf:%d sbf:%d sbe: %f pbe: %f db: %.2f\n", + provider.getNumFrames(), outputFrames, + passbandFrame, stopbandFrame, stopbandEnergy, passbandEnergy, dbAtten); + for (size_t i = 0; i < 10; ++i) { + printf("%d\n", out[i+passbandFrame*channels]); + } + for (size_t i = 0; i < 10; ++i) { + printf("%d\n", out[i+stopbandFrame*channels]); + } +#endif + } + + free(reference); + delete resampler; +} + +/* Buffer increment test + * + * We compare a reference output, where we consume and process the entire + * buffer at a time, and a test output, where we provide small chunks of input + * data and process small chunks of output (which may not be equivalent in size). + * + * Two subtests - fixed phase (3:2 down) and interpolated phase (147:320 up) + */ +TEST(audioflinger_resampler, bufferincrement_fixedphase) { + // all of these work + static const enum android::AudioResampler::src_quality kQualityArray[] = { + android::AudioResampler::LOW_QUALITY, + android::AudioResampler::MED_QUALITY, + android::AudioResampler::HIGH_QUALITY, + android::AudioResampler::VERY_HIGH_QUALITY, + android::AudioResampler::DYN_LOW_QUALITY, + android::AudioResampler::DYN_MED_QUALITY, + android::AudioResampler::DYN_HIGH_QUALITY, + }; + + for (size_t i = 0; i < ARRAY_SIZE(kQualityArray); ++i) { + testBufferIncrement(2, 48000, 32000, kQualityArray[i]); + } +} + +TEST(audioflinger_resampler, bufferincrement_interpolatedphase) { + // all of these work except low quality + static const enum android::AudioResampler::src_quality kQualityArray[] = { +// android::AudioResampler::LOW_QUALITY, + android::AudioResampler::MED_QUALITY, + android::AudioResampler::HIGH_QUALITY, + android::AudioResampler::VERY_HIGH_QUALITY, + android::AudioResampler::DYN_LOW_QUALITY, + android::AudioResampler::DYN_MED_QUALITY, + android::AudioResampler::DYN_HIGH_QUALITY, + }; + + for (size_t i = 0; i < ARRAY_SIZE(kQualityArray); ++i) { + testBufferIncrement(2, 22050, 48000, kQualityArray[i]); + } +} + +/* Simple aliasing test + * + * This checks stopband response of the chirp signal to make sure frequencies + * are properly suppressed. It uses downsampling because the stopband can be + * clearly isolated by input frequencies exceeding the output sample rate (nyquist). + */ +TEST(audioflinger_resampler, stopbandresponse) { + // not all of these may work (old resamplers fail on downsampling) + static const enum android::AudioResampler::src_quality kQualityArray[] = { + //android::AudioResampler::LOW_QUALITY, + //android::AudioResampler::MED_QUALITY, + //android::AudioResampler::HIGH_QUALITY, + //android::AudioResampler::VERY_HIGH_QUALITY, + android::AudioResampler::DYN_LOW_QUALITY, + android::AudioResampler::DYN_MED_QUALITY, + android::AudioResampler::DYN_HIGH_QUALITY, + }; + + // in this test we assume a maximum transition band between 12kHz and 20kHz. + // there must be at least 60dB relative attenuation between stopband and passband. + for (size_t i = 0; i < ARRAY_SIZE(kQualityArray); ++i) { + testStopbandDownconversion(2, 48000, 32000, 12000, 20000, kQualityArray[i]); + } + + // in this test we assume a maximum transition band between 7kHz and 15kHz. + // there must be at least 60dB relative attenuation between stopband and passband. + // (the weird ratio triggers interpolative resampling) + for (size_t i = 0; i < ARRAY_SIZE(kQualityArray); ++i) { + testStopbandDownconversion(2, 48000, 22101, 7000, 15000, kQualityArray[i]); + } +} diff --git a/services/audioflinger/tests/run_all_unit_tests.sh b/services/audioflinger/tests/run_all_unit_tests.sh new file mode 100755 index 0000000..ffae6ae --- /dev/null +++ b/services/audioflinger/tests/run_all_unit_tests.sh @@ -0,0 +1,11 @@ +#!/bin/bash + +if [ -z "$ANDROID_BUILD_TOP" ]; then + echo "Android build environment not set" + exit -1 +fi + +echo "waiting for device" +adb root && adb wait-for-device remount + +adb shell /system/bin/resampler_tests -- cgit v1.1