Adding MegaDrone sample (from AES talk)
diff --git a/samples/MegaDrone/src/main/cpp/Mixer.h b/samples/MegaDrone/src/main/cpp/Mixer.h
new file mode 100644
index 0000000..2d45dbc
--- /dev/null
+++ b/samples/MegaDrone/src/main/cpp/Mixer.h
@@ -0,0 +1,57 @@
+/*
+ * 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 RHYTHMGAME_MIXER_H
+#define RHYTHMGAME_MIXER_H
+
+#include "RenderableAudio.h"
+
+constexpr int32_t kBufferSize = 192*10; // Temporary buffer is used for mixing
+constexpr uint8_t kMaxTracks = 100;
+
+template <typename T>
+class Mixer : public RenderableAudio<T> {
+
+public:
+
+ void renderAudio(T *audioData, int32_t numFrames) {
+
+ // Zero out the incoming container array
+ for (int j = 0; j < numFrames; ++j) {
+ audioData[j] = 0;
+ }
+
+ for (int i = 0; i < mNextFreeTrackIndex; ++i) {
+ mTracks[i]->renderAudio(mixingBuffer, numFrames);
+
+ for (int j = 0; j < numFrames; ++j) {
+ audioData[j] += mixingBuffer[j];
+ }
+ }
+ }
+
+ void addTrack(RenderableAudio<T> *renderer){
+ mTracks[mNextFreeTrackIndex++] = renderer;
+ }
+
+private:
+ T mixingBuffer[kBufferSize]; // TODO: smart pointer
+ RenderableAudio<T>* mTracks[kMaxTracks]; // TODO: this might be better as a linked list for easy track removal
+ uint8_t mNextFreeTrackIndex = 0;
+};
+
+
+#endif //RHYTHMGAME_MIXER_H