OboeService: initial commit
This builds a standalone service that is easy to test.
Bug: 33269952
Test: test_oboe_api
Change-Id: I1890b1b974e728c2c0c15e24aa02121c2774bd56
Signed-off-by: Phil Burk <philburk@google.com>
diff --git a/services/oboeservice/SharedRingBuffer.h b/services/oboeservice/SharedRingBuffer.h
new file mode 100644
index 0000000..3cc1c2d
--- /dev/null
+++ b/services/oboeservice/SharedRingBuffer.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2016 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 OBOE_SHARED_RINGBUFFER_H
+#define OBOE_SHARED_RINGBUFFER_H
+
+#include <stdint.h>
+#include <cutils/ashmem.h>
+#include <sys/mman.h>
+
+#include "fifo/FifoBuffer.h"
+#include "RingBufferParcelable.h"
+#include "AudioEndpointParcelable.h"
+
+namespace oboe {
+
+// Determine the placement of the counters and data in shared memory.
+#define SHARED_RINGBUFFER_READ_OFFSET 0
+#define SHARED_RINGBUFFER_WRITE_OFFSET sizeof(fifo_counter_t)
+#define SHARED_RINGBUFFER_DATA_OFFSET (SHARED_RINGBUFFER_WRITE_OFFSET + sizeof(fifo_counter_t))
+
+/**
+ * Atomic FIFO that uses shared memory.
+ */
+class SharedRingBuffer {
+public:
+ SharedRingBuffer() {}
+
+ virtual ~SharedRingBuffer();
+
+ oboe_result_t allocate(fifo_frames_t bytesPerFrame, fifo_frames_t capacityInFrames);
+
+ void fillParcelable(AudioEndpointParcelable &endpointParcelable,
+ RingBufferParcelable &ringBufferParcelable);
+
+ FifoBuffer * getFifoBuffer() {
+ return mFifoBuffer;
+ }
+
+private:
+ int mFileDescriptor = -1;
+ FifoBuffer * mFifoBuffer = nullptr;
+ uint8_t * mSharedMemory = nullptr;
+ int32_t mSharedMemorySizeInBytes = 0;
+ int32_t mDataMemorySizeInBytes = 0;
+ fifo_frames_t mCapacityInFrames = 0;
+};
+
+} /* namespace oboe */
+
+#endif //OBOE_SHARED_RINGBUFFER_H