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77 lines
2.4 KiB
77 lines
2.4 KiB
4 months ago
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/*
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* Copyright (C) 2016 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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#ifndef AAUDIO_SHARED_RINGBUFFER_H
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#define AAUDIO_SHARED_RINGBUFFER_H
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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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// Determine the placement of the counters and data in shared memory.
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#define SHARED_RINGBUFFER_READ_OFFSET 0
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#define SHARED_RINGBUFFER_WRITE_OFFSET sizeof(fifo_counter_t)
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#define SHARED_RINGBUFFER_DATA_OFFSET (SHARED_RINGBUFFER_WRITE_OFFSET + sizeof(fifo_counter_t))
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/**
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* Atomic FIFO that uses shared memory.
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*/
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class SharedRingBuffer {
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public:
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SharedRingBuffer() {}
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virtual ~SharedRingBuffer();
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aaudio_result_t allocate(android::fifo_frames_t bytesPerFrame, android::fifo_frames_t capacityInFrames);
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void fillParcelable(AudioEndpointParcelable &endpointParcelable,
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RingBufferParcelable &ringBufferParcelable);
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/**
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* Return available frames as a fraction of the capacity.
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* @return fullness between 0.0 and 1.0
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*/
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double getFractionalFullness() const;
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// dump: write# read# available
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std::string dump() const;
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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 mFileDescriptor;
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std::shared_ptr<android::FifoBufferIndirect> mFifoBuffer;
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uint8_t *mSharedMemory = nullptr; // mmap
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int32_t mSharedMemorySizeInBytes = 0;
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// size of memory used for data vs counters
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int32_t mDataMemorySizeInBytes = 0;
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android::fifo_frames_t mCapacityInFrames = 0;
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};
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} /* namespace aaudio */
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#endif //AAUDIO_SHARED_RINGBUFFER_H
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