68 lines
2 KiB
C++
Vendored
68 lines
2 KiB
C++
Vendored
/*
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* Copyright (C) 2017 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_FIXED_BLOCK_ADAPTER_H
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#define AAUDIO_FIXED_BLOCK_ADAPTER_H
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#include <memory>
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#include <stdint.h>
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#include <sys/types.h>
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/**
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* Interface for a class that needs fixed-size blocks.
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*/
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class FixedBlockProcessor {
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public:
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virtual ~FixedBlockProcessor() = default;
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/**
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*
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* @param buffer Pointer to first byte of data.
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* @param numBytes This will be a fixed size specified in FixedBlockAdapter::open().
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* @return Number of bytes processed or a negative error code.
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*/
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virtual int32_t onProcessFixedBlock(uint8_t *buffer, int32_t numBytes) = 0;
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};
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/**
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* Base class for a variable-to-fixed-size block adapter.
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*/
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class FixedBlockAdapter
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{
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public:
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FixedBlockAdapter(FixedBlockProcessor &fixedBlockProcessor)
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: mFixedBlockProcessor(fixedBlockProcessor) {}
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virtual ~FixedBlockAdapter();
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/**
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* Allocate internal resources needed for buffering data.
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*/
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virtual int32_t open(int32_t bytesPerFixedBlock);
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/**
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* Free internal resources.
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*/
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int32_t close();
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protected:
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FixedBlockProcessor &mFixedBlockProcessor;
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std::unique_ptr<uint8_t[]> mStorage; // Store data here while assembling buffers.
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int32_t mSize = 0; // Size in bytes of the fixed size buffer.
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int32_t mPosition = 0; // Offset of the last byte read or written.
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};
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#endif /* AAUDIO_FIXED_BLOCK_ADAPTER_H */
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