media/libaaudio/tests/test_flowgraph.cpp

/*
 * Copyright 2018 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
 *
 * This file also tests a few different conversion techniques because
 * sometimes that have caused compiler bugs.
 */

#include <iostream>

#include <gtest/gtest.h>

#include <aaudio/AAudio.h>
#include "client/AAudioFlowGraph.h"
#include "flowgraph/ClipToRange.h"
#include "flowgraph/Limiter.h"
#include "flowgraph/MonoBlend.h"
#include "flowgraph/MonoToMultiConverter.h"
#include "flowgraph/RampLinear.h"
#include "flowgraph/SinkFloat.h"
#include "flowgraph/SinkI16.h"
#include "flowgraph/SinkI24.h"
#include "flowgraph/SinkI32.h"
#include "flowgraph/SinkI8_24.h"
#include "flowgraph/SourceFloat.h"
#include "flowgraph/SourceI16.h"
#include "flowgraph/SourceI24.h"
#include "flowgraph/SourceI8_24.h"
#include "flowgraph/resampler/IntegerRatio.h"

using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
using namespace RESAMPLER_OUTER_NAMESPACE::resampler;

using TestFlowgraphResamplerParams = std::tuple<int32_t, int32_t, MultiChannelResampler::Quality>;

enum {
    PARAM_SOURCE_SAMPLE_RATE = 0,
    PARAM_SINK_SAMPLE_RATE,
    PARAM_RESAMPLER_QUALITY
};

constexpr int kInt24Min = 0xff800000;
constexpr int kInt24Max = 0x007fffff;

constexpr int kBytesPerI24Packed = 3;

constexpr int kNumSamples = 8;
constexpr std::array<float, kNumSamples> kInputFloat = {
    1.0f, 0.5f, -0.25f, -1.0f,
    0.0f, 53.9f, -87.2f, -1.02f};

// Corresponding PCM values as integers.
constexpr std::array<int16_t, kNumSamples> kExpectedI16 = {
    INT16_MAX, 1 << 14, INT16_MIN / 4, INT16_MIN,
    0, INT16_MAX, INT16_MIN, INT16_MIN};

constexpr std::array<int32_t, kNumSamples> kExpectedI32 = {
    INT32_MAX, 1 << 30, INT32_MIN / 4, INT32_MIN,
    0, INT32_MAX, INT32_MIN, INT32_MIN};

constexpr std::array<int32_t, kNumSamples> kExpectedI8_24 = {
    kInt24Max, 1 << 22, kInt24Min / 4, kInt24Min,
    0, kInt24Max, kInt24Min, kInt24Min};

// =================================== FLOAT to I16 ==============

// Simple test that tries to reproduce a Clang compiler bug.
__attribute__((noinline))
void local_convert_float_to_int16(const float *input,
                                  int16_t *output,
                                  int count) {
    for (int i = 0; i < count; i++) {
        int32_t n = (int32_t) (*input++ * 32768.0f);
        *output++ = std::min(INT16_MAX, std::max(INT16_MIN, n)); // clip
    }
}

TEST(test_flowgraph, local_convert_float_int16) {
    std::array<int16_t, kNumSamples> output;

    // Do it inline, which will probably work even with the buggy compiler.
    // This validates the expected data.
    const float *in = kInputFloat.data();
    int16_t *out = output.data();
    output.fill(777);
    for (int i = 0; i < kNumSamples; i++) {
        int32_t n = (int32_t) (*in++ * 32768.0f);
        *out++ = std::min(INT16_MAX, std::max(INT16_MIN, n)); // clip
    }
    for (int i = 0; i < kNumSamples; i++) {
        EXPECT_EQ(kExpectedI16.at(i), output.at(i)) << ", i = " << i;
    }

    // Convert audio signal using the function.
    output.fill(777);
    local_convert_float_to_int16(kInputFloat.data(), output.data(), kNumSamples);
    for (int i = 0; i < kNumSamples; i++) {
        EXPECT_EQ(kExpectedI16.at(i), output.at(i)) << ", i = " << i;
    }
}

TEST(test_flowgraph, module_sinki16) {
    static constexpr int kNumSamples = 8;
    std::array<int16_t, kNumSamples + 10> output; // larger than input

    SourceFloat sourceFloat{1};
    SinkI16 sinkI16{1};

    sourceFloat.setData(kInputFloat.data(), kNumSamples);
    sourceFloat.output.connect(&sinkI16.input);

    output.fill(777);
    int32_t numRead = sinkI16.read(output.data(), output.size());
    ASSERT_EQ(kNumSamples, numRead);
    for (int i = 0; i < numRead; i++) {
        EXPECT_EQ(kExpectedI16.at(i), output.at(i)) << ", i = " << i;
    }
}

// =================================== FLOAT to I32 ==============
// Simple test that tries to reproduce a Clang compiler bug.
__attribute__((noinline))
static int32_t clamp32FromFloat(float f)
{
    static const float scale = (float)(1UL << 31);
    static const float limpos = 1.;
    static const float limneg = -1.;

    if (f <= limneg) {
        return INT32_MIN;
    } else if (f >= limpos) {
        return INT32_MAX;
    }
    f *= scale;
    /* integer conversion is through truncation (though int to float is not).
     * ensure that we round to nearest, ties away from 0.
     */
    return f > 0 ? f + 0.5 : f - 0.5;
}

void local_convert_float_to_int32(const float *input,
                                  int32_t *output,
                                  int count) {
    for (int i = 0; i < count; i++) {
        *output++ = clamp32FromFloat(*input++);
    }
}

TEST(test_flowgraph, simple_convert_float_int32) {
    std::array<int32_t, kNumSamples> output;

    // Do it inline, which will probably work even with a buggy compiler.
    // This validates the expected data.
    const float *in = kInputFloat.data();
    output.fill(777);
    int32_t *out = output.data();
    for (int i = 0; i < kNumSamples; i++) {
        int64_t n = (int64_t) (*in++ * 2147483648.0f);
        *out++ = (int32_t)std::min((int64_t)INT32_MAX,
                                   std::max((int64_t)INT32_MIN, n)); // clip
    }
    for (int i = 0; i < kNumSamples; i++) {
        EXPECT_EQ(kExpectedI32.at(i), output.at(i)) << ", i = " << i;
    }
}

TEST(test_flowgraph, local_convert_float_int32) {
    std::array<int32_t, kNumSamples> output;
    // Convert audio signal using the function.
    output.fill(777);
    local_convert_float_to_int32(kInputFloat.data(), output.data(), kNumSamples);
    for (int i = 0; i < kNumSamples; i++) {
        EXPECT_EQ(kExpectedI32.at(i), output.at(i)) << ", i = " << i;
    }
}

TEST(test_flowgraph, module_sinki32) {
    std::array<int32_t, kNumSamples + 10> output; // larger than input

    SourceFloat sourceFloat{1};
    SinkI32 sinkI32{1};

    sourceFloat.setData(kInputFloat.data(), kNumSamples);
    sourceFloat.output.connect(&sinkI32.input);

    output.fill(777);
    int32_t numRead = sinkI32.read(output.data(), output.size());
    ASSERT_EQ(kNumSamples, numRead);
    for (int i = 0; i < numRead; i++) {
        EXPECT_EQ(kExpectedI32.at(i), output.at(i)) << ", i = " << i;
    }
}

TEST(test_flowgraph, module_mono_to_stereo) {
    static const float input[] = {1.0f, 2.0f, 3.0f};
    float output[100] = {};
    SourceFloat sourceFloat{1};
    MonoToMultiConverter monoToStereo{2};
    SinkFloat sinkFloat{2};

    sourceFloat.setData(input, 3);

    sourceFloat.output.connect(&monoToStereo.input);
    monoToStereo.output.connect(&sinkFloat.input);

    int32_t numRead = sinkFloat.read(output, 8);
    ASSERT_EQ(3, numRead);
    EXPECT_EQ(input[0], output[0]);
    EXPECT_EQ(input[0], output[1]);
    EXPECT_EQ(input[1], output[2]);
    EXPECT_EQ(input[1], output[3]);
    EXPECT_EQ(input[2], output[4]);
    EXPECT_EQ(input[2], output[5]);
}

TEST(test_flowgraph, module_ramp_linear) {
    constexpr int singleNumOutput = 1;
    constexpr int rampSize = 5;
    constexpr int numOutput = 100;
    constexpr float value = 1.0f;
    constexpr float initialTarget = 10.0f;
    constexpr float finalTarget = 100.0f;
    constexpr float tolerance = 0.0001f; // arbitrary
    float output[numOutput] = {};
    RampLinear rampLinear{1};
    SinkFloat sinkFloat{1};

    rampLinear.input.setValue(value);
    rampLinear.setLengthInFrames(rampSize);
    rampLinear.output.connect(&sinkFloat.input);

    // Check that the values go to the initial target instantly.
    rampLinear.setTarget(initialTarget);
    int32_t singleNumRead = sinkFloat.read(output, singleNumOutput);
    ASSERT_EQ(singleNumRead, singleNumOutput);
    EXPECT_NEAR(value * initialTarget, output[0], tolerance);

    // Now set target and check that the linear ramp works as expected.
    rampLinear.setTarget(finalTarget);
    int32_t numRead = sinkFloat.read(output, numOutput);
    const float incrementSize = (finalTarget - initialTarget) / rampSize;
    ASSERT_EQ(numOutput, numRead);

    int i = 0;
    for (; i < rampSize; i++) {
        float expected = value * (initialTarget + i * incrementSize);
        EXPECT_NEAR(expected, output[i], tolerance);
    }
    for (; i < numOutput; i++) {
        float expected = value * finalTarget;
        EXPECT_NEAR(expected, output[i], tolerance);
    }
}

// It is easiest to represent packed 24-bit data as a byte array.
// This test will read from input, convert to float, then write
// back to output as bytes.
TEST(test_flowgraph, module_packed_24) {
    static const uint8_t input[] = {0x01, 0x23, 0x45,
                                    0x67, 0x89, 0xAB,
                                    0xCD, 0xEF, 0x5A};
    uint8_t output[99] = {};
    SourceI24 sourceI24{1};
    SinkI24 sinkI24{1};

    int numInputFrames = sizeof(input) / kBytesPerI24Packed;
    sourceI24.setData(input, numInputFrames);
    sourceI24.output.connect(&sinkI24.input);

    int32_t numRead = sinkI24.read(output, sizeof(output) / kBytesPerI24Packed);
    ASSERT_EQ(numInputFrames, numRead);
    for (size_t i = 0; i < sizeof(input); i++) {
        EXPECT_EQ(input[i], output[i]);
    }
}

TEST(test_flowgraph, module_clip_to_range) {
    constexpr float myMin = -2.0f;
    constexpr float myMax = 1.5f;

    static const float input[] = {-9.7, 0.5f, -0.25, 1.0f, 12.3};
    static const float expected[] = {myMin, 0.5f, -0.25, 1.0f, myMax};
    float output[100];
    SourceFloat sourceFloat{1};
    ClipToRange clipper{1};
    SinkFloat sinkFloat{1};

    int numInputFrames = sizeof(input) / sizeof(input[0]);
    sourceFloat.setData(input, numInputFrames);

    clipper.setMinimum(myMin);
    clipper.setMaximum(myMax);

    sourceFloat.output.connect(&clipper.input);
    clipper.output.connect(&sinkFloat.input);

    int numOutputFrames = sizeof(output) / sizeof(output[0]);
    int32_t numRead = sinkFloat.read(output, numOutputFrames);
    ASSERT_EQ(numInputFrames, numRead);
    constexpr float tolerance = 0.000001f; // arbitrary
    for (int i = 0; i < numRead; i++) {
        EXPECT_NEAR(expected[i], output[i], tolerance);
    }
}

TEST(test_flowgraph, module_mono_blend) {
    // Two channel to two channel with 3 inputs and outputs.
    constexpr int numChannels = 2;
    constexpr int numFrames = 3;

    static const float input[] = {-0.7, 0.5, -0.25, 1.25, 1000, 2000};
    static const float expected[] = {-0.1, -0.1, 0.5, 0.5, 1500, 1500};
    float output[100];
    SourceFloat sourceFloat{numChannels};
    MonoBlend monoBlend{numChannels};
    SinkFloat sinkFloat{numChannels};

    sourceFloat.setData(input, numFrames);

    sourceFloat.output.connect(&monoBlend.input);
    monoBlend.output.connect(&sinkFloat.input);

    int32_t numRead = sinkFloat.read(output, numFrames);
    ASSERT_EQ(numRead, numFrames);
    constexpr float tolerance = 0.000001f; // arbitrary
    for (int i = 0; i < numRead; i++) {
        EXPECT_NEAR(expected[i], output[i], tolerance);
    }
}

TEST(test_flowgraph, module_limiter) {
    constexpr int kNumSamples = 101;
    constexpr float kLastSample = 3.0f;
    constexpr float kFirstSample = -kLastSample;
    constexpr float kDeltaBetweenSamples = (kLastSample - kFirstSample) / (kNumSamples - 1);
    constexpr float kTolerance = 0.00001f;

    float input[kNumSamples];
    float output[kNumSamples];
    SourceFloat sourceFloat{1};
    Limiter limiter{1};
    SinkFloat sinkFloat{1};

    for (int i = 0; i < kNumSamples; i++) {
        input[i] = kFirstSample + i * kDeltaBetweenSamples;
    }

    const int numInputFrames = std::size(input);
    sourceFloat.setData(input, numInputFrames);

    sourceFloat.output.connect(&limiter.input);
    limiter.output.connect(&sinkFloat.input);

    const int numOutputFrames = std::size(output);
    int32_t numRead = sinkFloat.read(output, numOutputFrames);
    ASSERT_EQ(numInputFrames, numRead);

    for (int i = 0; i < numRead; i++) {
        // limiter must be symmetric wrt 0.
        EXPECT_NEAR(output[i], -output[kNumSamples - i - 1], kTolerance);
        if (i > 0) {
            EXPECT_GE(output[i], output[i - 1]); // limiter must be monotonic
        }
        if (input[i] == 0.f) {
            EXPECT_EQ(0.f, output[i]);
        } else if (input[i] > 0.0f) {
            EXPECT_GE(output[i], 0.0f);
            EXPECT_LE(output[i], M_SQRT2); // limiter actually limits
            EXPECT_LE(output[i], input[i]); // a limiter, gain <= 1
        } else {
            EXPECT_LE(output[i], 0.0f);
            EXPECT_GE(output[i], -M_SQRT2); // limiter actually limits
            EXPECT_GE(output[i], input[i]); // a limiter, gain <= 1
        }
        if (-1.f <= input[i] && input[i] <= 1.f) {
            EXPECT_EQ(input[i], output[i]);
        }
    }
}

TEST(test_flowgraph, module_limiter_nan) {
    constexpr int kArbitraryOutputSize = 100;
    static const float input[] = {NAN, 0.5f, NAN, NAN, -10.0f, NAN};
    static const float expected[] = {0.0f, 0.5f, 0.5f, 0.5f, -M_SQRT2, -M_SQRT2};
    constexpr float tolerance = 0.00001f;
    float output[kArbitraryOutputSize];
    SourceFloat sourceFloat{1};
    Limiter limiter{1};
    SinkFloat sinkFloat{1};

    const int numInputFrames = std::size(input);
    sourceFloat.setData(input, numInputFrames);

    sourceFloat.output.connect(&limiter.input);
    limiter.output.connect(&sinkFloat.input);

    const int numOutputFrames = std::size(output);
    int32_t numRead = sinkFloat.read(output, numOutputFrames);
    ASSERT_EQ(numInputFrames, numRead);

    for (int i = 0; i < numRead; i++) {
        EXPECT_NEAR(expected[i], output[i], tolerance);
    }
}

TEST(test_flowgraph, module_sinki16_multiple_reads) {
    static constexpr int kNumSamples = 8;
    std::array<int16_t, kNumSamples + 10> output; // larger than input

    SourceFloat sourceFloat{1};
    SinkI16 sinkI16{1};

    sourceFloat.setData(kInputFloat.data(), kNumSamples);
    sourceFloat.output.connect(&sinkI16.input);

    output.fill(777);

    // Read the first half of the data
    int32_t numRead = sinkI16.read(output.data(), kNumSamples / 2);
    ASSERT_EQ(kNumSamples / 2, numRead);
    for (int i = 0; i < numRead; i++) {
        EXPECT_EQ(kExpectedI16.at(i), output.at(i)) << ", i = " << i;
    }

    // Read the rest of the data
    numRead = sinkI16.read(output.data(), output.size());
    ASSERT_EQ(kNumSamples / 2, numRead);
    for (int i = 0; i < numRead; i++) {
        EXPECT_EQ(kExpectedI16.at(i + kNumSamples / 2), output.at(i)) << ", i = " << i;
    }
}

// =================================== FLOAT to Q8.23 ==============
__attribute__((noinline))
static int32_t clamp24FromFloat(float f)
{
    static const float scale = 1 << 23;
    return (int32_t) lroundf(fmaxf(fminf(f * scale, scale - 1.f), -scale));
}

void local_convert_float_to_i8_24(const float *input,
                                  int32_t *output,
                                  int count) {
    for (int i = 0; i < count; i++) {
        *output++ = clamp24FromFloat(*input++);
    }
}

TEST(test_flowgraph, local_convert_float_to_i8_24) {
    std::array<int32_t, kNumSamples> output;
    // Convert audio signal using the function.
    output.fill(777);
    local_convert_float_to_i8_24(kInputFloat.data(), output.data(), kNumSamples);
    for (int i = 0; i < kNumSamples; i++) {
        EXPECT_EQ(kExpectedI8_24.at(i), output.at(i)) << ", i = " << i;
    }
}

TEST(test_flowgraph, module_sinkI8_24) {
    std::array<int32_t, kNumSamples + 10> output; // larger than input

    SourceFloat sourceFloat{2};
    SinkI8_24 sinkI8_24{2};

    sourceFloat.setData(kInputFloat.data(), kNumSamples);
    sourceFloat.output.connect(&sinkI8_24.input);

    output.fill(777);
    int32_t numRead = sinkI8_24.read(output.data(), output.size());
    ASSERT_EQ(kNumSamples, numRead);
    for (int i = 0; i < numRead; i++) {
        EXPECT_EQ(kExpectedI8_24.at(i), output.at(i)) << ", i = " << i;
    }
}

TEST(test_flowgraph, module_sourceI8_24) {
    static const int32_t input[] = {1 << 23, 1 << 22, -(1 << 21), -(1 << 23), 0, 1 << 25,
            -(1 << 25)};
    static const float expected[] = {1.0f, 0.5f, -0.25f, -1.0f, 0.0f, 4.0f, -4.0f};
    float output[100];

    SourceI8_24 sourceI8_24{1};
    SinkFloat sinkFloat{1};

    int numSamples = std::size(input);

    sourceI8_24.setData(input, numSamples);
    sourceI8_24.output.connect(&sinkFloat.input);

    int32_t numRead = sinkFloat.read(output, numSamples);
    ASSERT_EQ(numSamples, numRead);
    for (int i = 0; i < numRead; i++) {
        EXPECT_EQ(expected[i], output[i]) << ", i = " << i;
    }
}

void checkSampleRateConversionVariedSizes(int32_t sourceSampleRate,
                    int32_t sinkSampleRate,
                    MultiChannelResampler::Quality resamplerQuality) {
    AAudioFlowGraph flowgraph;
    aaudio_result_t result = flowgraph.configure(AUDIO_FORMAT_PCM_FLOAT /* sourceFormat */,
            1 /* sourceChannelCount */,
            sourceSampleRate,
            AUDIO_FORMAT_PCM_FLOAT /* sinkFormat */,
            1 /* sinkChannelCount */,
            sinkSampleRate,
            false /* useMonoBlend */,
            false /* useVolumeRamps */,
            0.0f /* audioBalance */,
            resamplerQuality);

    IntegerRatio ratio(sourceSampleRate, sinkSampleRate);
    ratio.reduce();

    ASSERT_EQ(AAUDIO_OK, result);

    const int inputSize = ratio.getNumerator();
    const int outputSize = ratio.getDenominator();
    float input[inputSize];
    float output[outputSize];

    for (int i = 0; i < inputSize; i++) {
        input[i] = i * 1.0f / inputSize;
    }

    int inputUsed = 0;
    int outputRead = 0;
    int curInputSize = 1;

    // Process the data with larger and larger input buffer sizes.
    while (inputUsed < inputSize) {
        outputRead += flowgraph.process((void *) (input + inputUsed),
                curInputSize,
                (void *) (output + outputRead),
                outputSize - outputRead);
        inputUsed += curInputSize;
        curInputSize = std::min(curInputSize + 5, inputSize - inputUsed);
    }

    ASSERT_EQ(outputSize, outputRead);

    for (int i = 1; i < outputSize; i++) {
        // The first values of the flowgraph will be close to zero.
        // Besides those, the values should be strictly increasing.
        if (output[i - 1] > 0.01f) {
            EXPECT_GT(output[i], output[i - 1]);
        }
    }
}

TEST(test_flowgraph, flowgraph_varied_sizes_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) {
                    checkSampleRateConversionVariedSizes(srcRate, destRate, quality);
                }
            }
        }
    }
}

void checkSampleRateConversionPullLater(int32_t sourceSampleRate,
                    int32_t sinkSampleRate,
                    MultiChannelResampler::Quality resamplerQuality) {
    AAudioFlowGraph flowgraph;
    aaudio_result_t result = flowgraph.configure(AUDIO_FORMAT_PCM_FLOAT /* sourceFormat */,
            1 /* sourceChannelCount */,
            sourceSampleRate,
            AUDIO_FORMAT_PCM_FLOAT /* sinkFormat */,
            1 /* sinkChannelCount */,
            sinkSampleRate,
            false /* useMonoBlend */,
            false /* useVolumeRamps */,
            0.0f /* audioBalance */,
            resamplerQuality);

    IntegerRatio ratio(sourceSampleRate, sinkSampleRate);
    ratio.reduce();

    ASSERT_EQ(AAUDIO_OK, result);

    const int inputSize = ratio.getNumerator();
    const int outputSize = ratio.getDenominator();
    float input[inputSize];
    float output[outputSize];

    for (int i = 0; i < inputSize; i++) {
        input[i] = i * 1.0f / inputSize;
    }

    // Read half the data with process.
    int outputRead = flowgraph.process((void *) input,
            inputSize,
            (void *) output,
            outputSize / 2);

    ASSERT_EQ(outputSize / 2, outputRead);

    // Now read the other half of the data with pull.
    outputRead += flowgraph.pull(
            (void *) (output + outputRead),
            outputSize - outputRead);

    ASSERT_EQ(outputSize, outputRead);
    for (int i = 1; i < outputSize; i++) {
        // The first values of the flowgraph will be close to zero.
        // Besides those, the values should be strictly increasing.
        if (output[i - 1] > 0.01f) {
            EXPECT_GT(output[i], output[i - 1]);
        }
    }
}

// TODO: b/289508408 - Remove non-parameterized tests if they get noisy.
TEST(test_flowgraph, flowgraph_pull_later_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) {
                    checkSampleRateConversionPullLater(srcRate, destRate, quality);
                }
            }
        }
    }
}

class TestFlowgraphSampleRateConversion : public ::testing::Test,
                        public ::testing::WithParamInterface<TestFlowgraphResamplerParams> {
};

const char* resamplerQualityToString(MultiChannelResampler::Quality quality) {
    switch (quality) {
        case MultiChannelResampler::Quality::Fastest: return "FASTEST";
        case MultiChannelResampler::Quality::Low: return "LOW";
        case MultiChannelResampler::Quality::Medium: return "MEDIUM";
        case MultiChannelResampler::Quality::High: return "HIGH";
        case MultiChannelResampler::Quality::Best: return "BEST";
    }
    return "UNKNOWN";
}

static std::string getTestName(
        const ::testing::TestParamInfo<TestFlowgraphResamplerParams>& info) {
    return std::string()
            + std::to_string(std::get<PARAM_SOURCE_SAMPLE_RATE>(info.param))
            + "__" + std::to_string(std::get<PARAM_SINK_SAMPLE_RATE>(info.param))
            + "__" + resamplerQualityToString(std::get<PARAM_RESAMPLER_QUALITY>(info.param));
}

TEST_P(TestFlowgraphSampleRateConversion, test_flowgraph_pull_later) {
    checkSampleRateConversionPullLater(std::get<PARAM_SOURCE_SAMPLE_RATE>(GetParam()),
            std::get<PARAM_SINK_SAMPLE_RATE>(GetParam()),
            std::get<PARAM_RESAMPLER_QUALITY>(GetParam()));
}

TEST_P(TestFlowgraphSampleRateConversion, test_flowgraph_varied_sizes) {
    checkSampleRateConversionVariedSizes(std::get<PARAM_SOURCE_SAMPLE_RATE>(GetParam()),
            std::get<PARAM_SINK_SAMPLE_RATE>(GetParam()),
            std::get<PARAM_RESAMPLER_QUALITY>(GetParam()));
}

INSTANTIATE_TEST_SUITE_P(
        test_flowgraph,
        TestFlowgraphSampleRateConversion,
        ::testing::Values(
                TestFlowgraphResamplerParams({8000, 11025, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({8000, 48000, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({8000, 44100, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({11025, 24000, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({11025, 48000,
                        MultiChannelResampler::Quality::Fastest}),
                TestFlowgraphResamplerParams({11025, 48000, MultiChannelResampler::Quality::Low}),
                TestFlowgraphResamplerParams({11025, 48000,
                        MultiChannelResampler::Quality::Medium}),
                TestFlowgraphResamplerParams({11025, 48000, MultiChannelResampler::Quality::High}),
                TestFlowgraphResamplerParams({11025, 48000, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({11025, 44100, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({11025, 88200, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({16000, 48000, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({44100, 48000, MultiChannelResampler::Quality::Low}),
                TestFlowgraphResamplerParams({44100, 48000, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({48000, 11025, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({48000, 44100, MultiChannelResampler::Quality::Best}),
                TestFlowgraphResamplerParams({44100, 11025, MultiChannelResampler::Quality::Best})),
        &getTestName
);