1 files changed, 269 insertions, 0 deletions
diff --git a/externals/oboe/tests/testFlowgraph.cpp b/externals/oboe/tests/testFlowgraph.cpp
new file mode 100644
index 0000000000..2b341c3ab4
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+++ b/externals/oboe/tests/testFlowgraph.cpp
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+/*
+ * 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
+ */
+
+#include "stdio.h"
+
+#include <gtest/gtest.h>
+#include <oboe/Oboe.h>
+
+#include "flowgraph/ClipToRange.h"
+#include "flowgraph/Limiter.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"
+
+using namespace oboe::flowgraph;
+
+constexpr int kBytesPerI24Packed = 3;
+
+TEST(test_flowgraph, module_sinki16) {
+    static const float input[] = {1.0f, 0.5f, -0.25f, -1.0f, 0.0f, 53.9f, -87.2f};
+    static const int16_t expected[] = {32767, 16384, -8192, -32768, 0, 32767, -32768};
+    int16_t output[20];
+    SourceFloat sourceFloat{1};
+    SinkI16 sinkI16{1};
+
+    int numInputFrames = sizeof(input) / sizeof(input[0]);
+    sourceFloat.setData(input, numInputFrames);
+    sourceFloat.output.connect(&sinkI16.input);
+
+    int numOutputFrames = sizeof(output) / sizeof(int16_t);
+    int32_t numRead = sinkI16.read(output, numOutputFrames);
+    ASSERT_EQ(numInputFrames, numRead);
+    for (int i = 0; i < numRead; i++) {
+        EXPECT_EQ(expected[i], output[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_sinki32) {
+    static constexpr int kNumSamples = 8;
+    static const float input[] = {
+        1.0f, 0.5f, -0.25f, -1.0f,
+        0.0f, 53.9f, -87.2f, -1.02f};
+    static const int32_t expected[] = {
+        INT32_MAX, 1 << 30, INT32_MIN / 4, INT32_MIN,
+        0, INT32_MAX, INT32_MIN, INT32_MIN};
+    int32_t output[kNumSamples + 10]; // larger than input
+
+    SourceFloat sourceFloat{1};
+    SinkI32 sinkI32{1};
+
+    sourceFloat.setData(input, kNumSamples);
+    sourceFloat.output.connect(&sinkI32.input);
+
+    int numOutputFrames = sizeof(output) / sizeof(int32_t);
+    int32_t numRead = sinkI32.read(output, numOutputFrames);
+    ASSERT_EQ(kNumSamples, numRead);
+    for (int i = 0; i < numRead; i++) {
+        EXPECT_EQ(expected[i], output[i]) << ", i = " << i;
+    }
+}
+
+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;
+    constexpr float kFloatNan = NAN;
+    static const float input[] = {kFloatNan, 0.5f, kFloatNan, kFloatNan, -10.0f, kFloatNan};
+    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);
+    }
+}