/* * 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 AAUDIO_SHARED_RINGBUFFER_H #define AAUDIO_SHARED_RINGBUFFER_H #include #include #include #include #include "fifo/FifoBuffer.h" #include "binding/RingBufferParcelable.h" #include "binding/AudioEndpointParcelable.h" namespace aaudio { // 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(); aaudio_result_t allocate(android::fifo_frames_t bytesPerFrame, android::fifo_frames_t capacityInFrames); void fillParcelable(AudioEndpointParcelable &endpointParcelable, RingBufferParcelable &ringBufferParcelable); android::FifoBuffer * getFifoBuffer() { return mFifoBuffer; } private: android::base::unique_fd mFileDescriptor; android::FifoBuffer *mFifoBuffer = nullptr; uint8_t *mSharedMemory = nullptr; int32_t mSharedMemorySizeInBytes = 0; int32_t mDataMemorySizeInBytes = 0; android::fifo_frames_t mCapacityInFrames = 0; }; } /* namespace aaudio */ #endif //AAUDIO_SHARED_RINGBUFFER_H