87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <android-base/unique_fd.h>
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#include <cutils/ashmem.h>
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#include <stdint.h>
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#include <string>
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#include <sys/mman.h>
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#include "fifo/FifoBuffer.h"
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#include "binding/RingBufferParcelable.h"
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#include "binding/AudioEndpointParcelable.h"
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namespace aaudio {
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/**
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* Wrap the shared memory with read and write counters. Provide a fifo buffer to access the
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* wrapped shared memory.
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*/
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class SharedMemoryWrapper {
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public:
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explicit SharedMemoryWrapper();
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virtual ~SharedMemoryWrapper();
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android::base::unique_fd& getDataFileDescriptor() { return mDataFd; }
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aaudio_result_t setupFifoBuffer(android::fifo_frames_t bytesPerFrame,
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android::fifo_frames_t capacityInFrames);
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void reset();
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enum CounterFilling {
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NONE = 0,
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READ = 1,
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WRITE = 2,
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};
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/**
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* Fill shared memory into parcelable.
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*
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* @param endpointParcelable container for ring buffers and shared memories
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* @param ringBufferParcelable the ring buffer
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* @param bytesPerFrame the bytes per frame of the data memory
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* @param framesPerBurst the frame per burst of the data memory
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* @param capacityInFrames the capacity in frames of the data memory
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* @param counterFilling a bit mask to control if the counter from the wrapper should be filled
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* or not.
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*/
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void fillParcelable(AudioEndpointParcelable* endpointParcelable,
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RingBufferParcelable &ringBufferParcelable,
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int32_t bytesPerFrame,
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int32_t framesPerBurst,
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int32_t capacityInFrames,
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CounterFilling counterFilling = NONE);
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std::shared_ptr<android::FifoBuffer> getFifoBuffer() {
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return mFifoBuffer;
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}
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private:
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android::base::unique_fd mDataFd;
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android::base::unique_fd mCounterFd;
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uint8_t* mCounterMemoryAddress = nullptr;
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android::fifo_counter_t* mReadCounterAddress = nullptr;
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android::fifo_counter_t* mWriteCounterAddress = nullptr;
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std::shared_ptr<android::FifoBufferIndirect> mFifoBuffer;
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uint8_t* mSharedMemory = nullptr;
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int32_t mSharedMemorySizeInBytes = 0;
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};
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} /* namespace aaudio */
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