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/*
* 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_STREAM_BUFFERED_H
#define OBOE_STREAM_BUFFERED_H
#include <cstring>
#include <assert.h>
#include "common/OboeDebug.h"
#include "oboe/AudioStream.h"
#include "oboe/AudioStreamCallback.h"
#include "fifo/FifoBuffer.h"
namespace oboe {
// A stream that contains a FIFO buffer.
// This is used to implement blocking reads and writes.
class AudioStreamBuffered : public AudioStream {
public:
AudioStreamBuffered();
explicit AudioStreamBuffered(const AudioStreamBuilder &builder);
void allocateFifo();
ResultWithValue<int32_t> write(const void *buffer,
int32_t numFrames,
int64_t timeoutNanoseconds) override;
ResultWithValue<int32_t> read(void *buffer,
int32_t numFrames,
int64_t timeoutNanoseconds) override;
ResultWithValue<int32_t> setBufferSizeInFrames(int32_t requestedFrames) override;
int32_t getBufferSizeInFrames() const override;
int32_t getBufferCapacityInFrames() const override;
ResultWithValue<int32_t> getXRunCount() const override {
return ResultWithValue<int32_t>(mXRunCount);
}
int64_t getFramesWritten() const override;
int64_t getFramesRead() const override;
protected:
DataCallbackResult onDefaultCallback(void *audioData, int numFrames) override;
// If there is no callback then we need a FIFO between the App and OpenSL ES.
bool usingFIFO() const { return getCallback() == nullptr; }
virtual Result updateServiceFrameCounter() { return Result::OK; };
private:
int64_t predictNextCallbackTime();
void markCallbackTime(int numFrames);
// Read or write to the FIFO.
ResultWithValue<int32_t> transfer(void *buffer, int32_t numFrames, int64_t timeoutNanoseconds);
void incrementXRunCount() {
mXRunCount++;
}
std::unique_ptr<FifoBuffer> mFifoBuffer;
int64_t mBackgroundRanAtNanoseconds = 0;
int32_t mLastBackgroundSize = 0;
int32_t mXRunCount = 0;
};
} // namespace oboe
#endif //OBOE_STREAM_BUFFERED_H
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