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/*
* Copyright (C) 2011 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 FRAMEWORKS_EX_VARIABLESPEED_JNI_DECODE_BUFFER_H_
#define FRAMEWORKS_EX_VARIABLESPEED_JNI_DECODE_BUFFER_H_
#include <integral_types.h>
#include <macros.h>
#include <stdlib.h>
#include <vector>
// DecodeBuffer is used to store arrays of int16 values for audio.
//
// This class is not thread-safe. You should provide your own
// synchronization if you wish to use it from multiple threads.
class DecodeBuffer {
public:
DecodeBuffer(size_t sizeOfOneBuffer, size_t maxSize);
virtual ~DecodeBuffer();
size_t GetSizeInBytes() const;
void AddData(int8_t* pointer, size_t lengthInBytes);
void Clear();
void AdvanceHeadPointerShorts(size_t numberOfShorts);
int16 GetAtIndex(size_t index);
bool IsTooLarge() const;
size_t GetTotalAdvancedCount() const;
private:
void PushValue(int16 value);
size_t sizeOfOneBuffer_;
size_t maxSize_;
size_t start_;
size_t end_;
size_t advancedCount_;
// This vector isn't ideal because we perform a number of queue-like
// operations: namely removing from the front and appending at the back.
// However we also need constant-time access to the elements of this
// vector, and therefore it's not good enough to use a std::queue.
// In practice this data structure choice doesn't seem to be a bottleneck.
std::vector<int16*> data_;
DISALLOW_COPY_AND_ASSIGN(DecodeBuffer);
};
#endif // FRAMEWORKS_EX_VARIABLESPEED_JNI_DECODE_BUFFER_H_
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