media/libaaudio/tests/test_flowgraph.cpp - LeafOS-Project/android_frameworks_av - Gitiles

 /*
  * 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/SourceFloat.h"
 #include "flowgraph/RampLinear.h"
 #include "flowgraph/SinkFloat.h"
 #include "flowgraph/SinkI16.h"
 #include "flowgraph/SinkI24.h"
 #include "flowgraph/SinkI32.h"
 #include "flowgraph/SourceI16.h"
 #include "flowgraph/SourceI24.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 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};

 // =================================== 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]);
 }

 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;
     }
 }

 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
 );
	/*
	* 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/SourceFloat.h"
	#include "flowgraph/RampLinear.h"
	#include "flowgraph/SinkFloat.h"
	#include "flowgraph/SinkI16.h"
	#include "flowgraph/SinkI24.h"
	#include "flowgraph/SinkI32.h"
	#include "flowgraph/SourceI16.h"
	#include "flowgraph/SourceI24.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 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};

	// =================================== 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]);
	}

	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;
	}
	}

	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
	);