v4l2Camera.h

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/*
 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef __V4L2_CAPTURE_H__
#define __V4L2_CAPTURE_H__
 
#include <linux/videodev2.h>
 
#include <stdint.h>
#include <string>
#include <vector>
 
 
 
class v4l2Camera
{
public: 
        static v4l2Camera* Create( const char* device_path );
 
        ~v4l2Camera();
 
        bool Open();
 
        bool Close();
 
        void* Capture( size_t timeout=0 );
 
        inline uint32_t GetWidth() const                                        { return mWidth; }
        
        inline uint32_t GetHeight() const                                       { return mHeight; }
 
        inline uint32_t GetPitch() const                                        { return mPitch; }
 
        inline uint32_t GetPixelDepth() const                           { return mPixelDepth; }
 
private:
 
        v4l2Camera( const char* device_path );
 
        bool init();
        bool initCaps();
        bool initFormats();
        bool initStream();
 
        bool initUserPtr();
        bool initMMap();
 
        int         mFD;
        int         mRequestFormat;
        uint32_t mRequestWidth;
        uint32_t mRequestHeight;
        uint32_t mWidth;
        uint32_t mHeight;
        uint32_t mPitch;
        uint32_t mPixelDepth;
 
        struct v4l2_mmap
        {
                struct v4l2_buffer buf;
                void*  ptr;
        };
 
        v4l2_mmap* mBuffersMMap;
        size_t mBufferCountMMap;
 
        std::vector<v4l2_fmtdesc> mFormats;
        std::string mDevicePath;
};
 
 
#endif