Move dead submodules in-tree

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

externals/oboe/apps/fxlab/app/src/main/cpp/DuplexCallback.h

@@ -0,0 +1,80 @@
+/*
+ * Copyright  2019 Google LLC
+ *
+ * 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
+ *
+ *     https://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 ANDROID_FXLAB_DUPLEXCALLBACK_H
+#define ANDROID_FXLAB_DUPLEXCALLBACK_H
+
+#include <oboe/Oboe.h>
+
+
+
+// This callback handles mono in, stereo out synchronized audio passthrough.
+// It takes a function which operates on two pointers (beginning and end)
+// of underlying data.
+
+template<class numeric_type>
+class DuplexCallback : public oboe::AudioStreamCallback {
+public:
+
+    DuplexCallback(oboe::AudioStream &inStream,
+                   std::function<void(numeric_type *, numeric_type *)> fun,
+                   size_t buffer_size, std::function<void(void)> restartFunction) :
+            kBufferSize(buffer_size), inRef(inStream), f(fun), restart(restartFunction) {}
+
+
+    oboe::DataCallbackResult
+    onAudioReady(oboe::AudioStream *outputStream, void *audioData, int32_t numFrames) override {
+        auto *outputData = static_cast<numeric_type *>(audioData);
+        auto outputChannelCount = outputStream->getChannelCount();
+
+        // Silence first to simplify glitch detection
+        std::fill(outputData, outputData + numFrames * outputChannelCount, 0);
+        oboe::ResultWithValue<int32_t> result = inRef.read(inputBuffer.get(), numFrames, 0);
+        int32_t framesRead = result.value();
+        if (!result) {
+            inRef.requestStop();
+            return oboe::DataCallbackResult::Stop;
+        }
+        if (mSpinUpCallbacks > 0 && framesRead > 0) {
+            mSpinUpCallbacks--;
+            return oboe::DataCallbackResult::Continue;
+        }
+        f(inputBuffer.get(), inputBuffer.get() + framesRead);
+        for (int i = 0; i < framesRead; i++) {
+            for (size_t j = 0; j < outputChannelCount; j++) {
+                *outputData++ = inputBuffer[i];
+            }
+        }
+        return oboe::DataCallbackResult::Continue;
+    }
+
+    void onErrorAfterClose(oboe::AudioStream *, oboe::Result result) override {
+        inRef.close();
+        if (result == oboe::Result::ErrorDisconnected) {
+            restart();
+        }
+    }
+
+
+private:
+    int mSpinUpCallbacks = 10; // We will let the streams sync for the first few valid frames
+    const size_t kBufferSize;
+    oboe::AudioStream &inRef;
+    std::function<void(numeric_type *, numeric_type *)> f;
+    std::function<void(void)> restart;
+    std::unique_ptr<numeric_type[]> inputBuffer = std::make_unique<numeric_type[]>(kBufferSize);
+};
+
+#endif //ANDROID_FXLAB_DUPLEXCALLBACK_H