Move dead submodules in-tree

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

externals/oboe/samples/shared/MonoToStereo.h

@@ -0,0 +1,49 @@
+/*
+ * 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.
+ */
+
+#ifndef SHARED_MONOTOSTEREO_H
+#define SHARED_MONOTOSTEREO_H
+
+#include "IRenderableAudio.h"
+
+
+class MonoToStereo : public IRenderableAudio {
+
+public:
+
+    MonoToStereo(IRenderableAudio *input) : mInput(input){};
+
+    void renderAudio(float *audioData, int32_t numFrames) override {
+
+        constexpr int kChannelCountStereo = 2;
+
+        mInput->renderAudio(audioData, numFrames);
+
+        // We assume that audioData has sufficient frames to hold the stereo output, so copy each
+        // frame in the input to the output twice, working our way backwards through the input array
+        // e.g. 123 => 112233
+        for (int i = numFrames - 1; i >= 0; --i) {
+
+            audioData[i * kChannelCountStereo] = audioData[i];
+            audioData[i * kChannelCountStereo + 1] = audioData[i];
+        }
+    }
+
+    IRenderableAudio *mInput;
+};
+
+
+#endif //SHARED_MONOTOSTEREO_H