/*
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* Copyright (c) 2021 by Allwinnertech 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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#ifndef V4L2_CAMERA_HAL_V4L2_GRALLOC_H_
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#define V4L2_CAMERA_HAL_V4L2_GRALLOC_H_
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#include "common.h"
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#ifdef LOG_NDEBUG
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#undef LOG_NDEBUG
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#endif
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#if DBG_V4L2_GRALLOC
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#undef NDEBUG
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#define LOG_NDEBUG 0
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#else
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#define LOG_NDEBUG 1
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#endif
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#include <errno.h>
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#include <hardware/camera3.h>
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#include <hardware/gralloc.h>
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#include <linux/videodev2.h>
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#include <system/graphics.h>
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#include <unordered_map>
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#include "v4l2_log.h"
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namespace v4l2_camera_hal {
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// Generously allow up to 6MB (the largest JPEG on the RPi camera is about 5MB).
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static constexpr size_t V4L2_MAX_JPEG_SIZE = 20000000;
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// V4L2Gralloc is a wrapper around relevant parts of a gralloc module,
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// with some assistive transformations.
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class V4L2Gralloc {
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public:
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// Use this method to create V4L2Gralloc objects. Functionally equivalent
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// to "new V4L2Gralloc", except that it may return nullptr in case of failure.
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static V4L2Gralloc* NewV4L2Gralloc();
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virtual ~V4L2Gralloc();
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// Lock buffer for picture.
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int lock_pic(const camera3_stream_buffer_t* camera_buffer,
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unsigned long* device_buffer);
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int lock_buffer(const camera3_stream_buffer_t* camera_buffer,
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unsigned long* device_buffer);
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int unlock_buffer(const camera3_stream_buffer_t* camera_buffer);
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// Lock a camera buffer. Uses device buffer length, sets user pointer.
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int lock(const camera3_stream_buffer_t* camera_buffer,
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uint32_t bytes_per_line,
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v4l2_buffer* device_buffer);
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// Unlock a buffer that was locked by this helper (equality determined
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// based on buffer user pointer, not the specific object).
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int unlock(const v4l2_buffer* device_buffer);
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// Lock a camera buffer. Get vir addr, record index addr.
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int lock_index(const camera3_stream_buffer_t* camera_buffer,
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unsigned long* device_buffer, uint32_t result_index);
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// Unlock buffer by index addr.
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int unlock_index(uint32_t result_index);
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int lock_handle(const buffer_handle_t* buffer,
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void ** dst_addr);
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int lock_handle(const buffer_handle_t* buffer,
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void ** dst_addr, unsigned long * mJpegBufferSizes);
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int lock_handle_ycbcr(const buffer_handle_t* buffer,
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android_ycbcr * ycbcr_dst_addr);
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int get_share_fd(const buffer_handle_t* buffer,
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int * sharefd, unsigned long * mJpegBufferSizes);
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int unlock_handle(const buffer_handle_t* buffer);
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// Release all held locks.
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int unlockAllBuffers();
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private:
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// Constructor is private to allow failing on bad input.
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// Use NewV4L2Gralloc instead.
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explicit V4L2Gralloc(const gralloc_module_t* module);
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const gralloc_module_t* mModule;
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struct BufferData {
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const camera3_stream_buffer_t* camera_buffer;
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// Below fields only used when a ycbcr format transform is necessary.
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uint32_t v4l2_bytes_per_line;
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};
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BufferData* aBufferData[MAX_BUFFER_NUM];
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buffer_handle_t aBufferDataVideo[MAX_BUFFER_NUM];
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// Map buffer index : BufferData about that buffer.
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std::unordered_map<int, const BufferData*> mBufferMap;
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};
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} // namespace default_camera_hal
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#endif // V4L2_CAMERA_HAL_V4L2_GRALLOC_H_
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