Move dead submodules in-tree

Signed-off-by: swurl <swurl@swurl.xyz>

1 files changed, 61 insertions, 0 deletions

diff --git a/externals/oboe/src/flowgraph/resampler/PolyphaseResampler.cpp b/externals/oboe/src/flowgraph/resampler/PolyphaseResampler.cpp
new file mode 100644
index 0000000000..c16273b79c
--- /dev/null
+++ b/externals/oboe/src/flowgraph/resampler/PolyphaseResampler.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2019 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.
+ */
+
+#include <algorithm>   // Do NOT delete. Needed for LLVM. See #1746
+#include <cassert>
+#include <math.h>
+#include "IntegerRatio.h"
+#include "PolyphaseResampler.h"
+
+using namespace RESAMPLER_OUTER_NAMESPACE::resampler;
+
+PolyphaseResampler::PolyphaseResampler(const MultiChannelResampler::Builder &builder)
+        : MultiChannelResampler(builder)
+        {
+    assert((getNumTaps() % 4) == 0); // Required for loop unrolling.
+
+    int32_t inputRate = builder.getInputRate();
+    int32_t outputRate = builder.getOutputRate();
+
+    int32_t numRows = mDenominator;
+    double phaseIncrement = (double) inputRate / (double) outputRate;
+    generateCoefficients(inputRate, outputRate,
+                         numRows, phaseIncrement,
+                         builder.getNormalizedCutoff());
+}
+
+void PolyphaseResampler::readFrame(float *frame) {
+    // Clear accumulator for mixing.
+    std::fill(mSingleFrame.begin(), mSingleFrame.end(), 0.0);
+
+    // Multiply input times windowed sinc function.
+    float *coefficients = &mCoefficients[mCoefficientCursor];
+    float *xFrame = &mX[static_cast<size_t>(mCursor) * static_cast<size_t>(getChannelCount())];
+    for (int i = 0; i < mNumTaps; i++) {
+        float coefficient = *coefficients++;
+        for (int channel = 0; channel < getChannelCount(); channel++) {
+            mSingleFrame[channel] += *xFrame++ * coefficient;
+        }
+    }
+
+    // Advance and wrap through coefficients.
+    mCoefficientCursor = (mCoefficientCursor + mNumTaps) % mCoefficients.size();
+
+    // Copy accumulator to output.
+    for (int channel = 0; channel < getChannelCount(); channel++) {
+        frame[channel] = mSingleFrame[channel];
+    }
+}