/*
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* dma_buffer.h - DMA Buffer Implementation
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*
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* Copyright (c) 2021 Rockchip Electronics Co., Ltd
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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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* Author: Cody Xie <cody.xie@rock-chips.com>
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*/
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#ifndef _DMA_BUFFER_H_
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#define _DMA_BUFFER_H_
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#include <memory>
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#include "unique_fd.h"
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#include "xcam_common.h"
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namespace XCam {
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enum class DmaBufferDirection { kBidirectional, kDeviceToCPU, kCPUToDevice, kNone };
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class DmaBuffer {
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public:
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DmaBuffer(int fd, size_t size);
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virtual ~DmaBuffer();
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DmaBuffer(const DmaBuffer&) = delete;
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DmaBuffer& operator=(const DmaBuffer&) = delete;
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static XCamReturn sync(int fd, DmaBufferDirection direction, bool start);
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XCamReturn beginCpuAccess(DmaBufferDirection direction);
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XCamReturn endCpuAccess(DmaBufferDirection direction);
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void* map();
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void unmap();
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int getFd();
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size_t getSize();
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int release();
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bool mapped();
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private:
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UniqueFd fd_;
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size_t size_;
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void* ptr_;
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// TODO(Cody): modern implement of dma_buf
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// does not need name to import/export?
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// std::string name_;
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};
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}; // namespace XCam
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#endif // _DMA_BUFFER_H_
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