FifoBuffer.h

/*
 * Copyright 2015 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_FIFOPROCESSOR_H
#define OBOE_FIFOPROCESSOR_H
 
#include <memory>
#include <stdint.h>
 
#include "oboe/Definitions.h"
 
#include "oboe/FifoControllerBase.h"
 
namespace oboe {
 
class FifoBuffer {
public:
    FifoBuffer(uint32_t bytesPerFrame, uint32_t capacityInFrames);
 
    FifoBuffer(uint32_t   bytesPerFrame,
               uint32_t   capacityInFrames,
               std::atomic<uint64_t>   *readCounterAddress,
               std::atomic<uint64_t>   *writeCounterAddress,
               uint8_t   *dataStorageAddress);
 
    ~FifoBuffer();
 
    int32_t convertFramesToBytes(int32_t frames);
 
    int32_t read(void *destination, int32_t framesToRead);
 
    int32_t write(const void *source, int32_t framesToWrite);
 
    uint32_t getBufferCapacityInFrames() const;
 
    int32_t readNow(void *destination, int32_t numFrames);
 
    uint32_t getFullFramesAvailable() {
        return mFifo->getFullFramesAvailable();
    }
 
    uint32_t getBytesPerFrame() const {
        return mBytesPerFrame;
    }
 
    uint64_t getReadCounter() const {
        return mFifo->getReadCounter();
    }
 
    void setReadCounter(uint64_t n) {
        mFifo->setReadCounter(n);
    }
 
    uint64_t getWriteCounter() {
        return mFifo->getWriteCounter();
    }
 
    void setWriteCounter(uint64_t n) {
        mFifo->setWriteCounter(n);
    }
 
private:
    uint32_t mBytesPerFrame;
    uint8_t* mStorage;
    bool     mStorageOwned; // did this object allocate the storage?
    std::unique_ptr<FifoControllerBase> mFifo;
    uint64_t mFramesReadCount;
    uint64_t mFramesUnderrunCount;
};
 
} // namespace oboe
 
#endif //OBOE_FIFOPROCESSOR_H