/* ---------------------------------------------------------------------------
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** This software is in the public domain, furnished "as is", without technical
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** support, and with no warranty, express or implied, as to its usefulness for
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** any purpose.
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**
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** V4l2Device.h
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**
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** V4L2 wrapper
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**
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** -------------------------------------------------------------------------*/
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#ifndef V4L2_DEVICE
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#define V4L2_DEVICE
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#include <string>
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#include <linux/videodev2.h>
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#ifndef V4L2_PIX_FMT_VP8
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#define V4L2_PIX_FMT_VP8 v4l2_fourcc('V', 'P', '8', '0')
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#endif
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#ifndef V4L2_PIX_FMT_VP9
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#define V4L2_PIX_FMT_VP9 v4l2_fourcc('V', 'P', '9', '0')
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#endif
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// ---------------------------------
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// V4L2 Device parameters
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// ---------------------------------
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struct V4L2DeviceParameters
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{
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V4L2DeviceParameters(const char* devname, unsigned int format, unsigned int width, unsigned int height, int fps, int verbose) :
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m_devName(devname), m_format(format), m_width(width), m_height(height), m_fps(fps), m_verbose(verbose) {};
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std::string m_devName;
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unsigned int m_format;
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unsigned int m_width;
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unsigned int m_height;
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int m_fps;
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int m_verbose;
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};
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// ---------------------------------
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// V4L2 Device
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// ---------------------------------
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class V4l2Device
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{
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friend class V4l2Capture;
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friend class V4l2Output;
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protected:
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void close();
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int initdevice(const char *dev_name, unsigned int mandatoryCapabilities);
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int checkCapabilities(int fd, unsigned int mandatoryCapabilities);
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int configureFormat(int fd);
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int configureParam(int fd);
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virtual bool init(unsigned int mandatoryCapabilities);
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virtual size_t writeInternal(char*, size_t) { return -1; };
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virtual size_t readInternal(char*, size_t) { return -1; };
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public:
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V4l2Device(const V4L2DeviceParameters& params, v4l2_buf_type deviceType);
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virtual ~V4l2Device();
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virtual bool isReady() { return (m_fd != -1); }
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virtual bool start() { return true; }
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virtual bool stop() { return true; }
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int getBufferSize() { return m_bufferSize; }
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int getFormat() { return m_format; }
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int getWidth() { return m_width; }
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int getHeight() { return m_height; }
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int getFd() { return m_fd; }
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void queryFormat();
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protected:
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V4L2DeviceParameters m_params;
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int m_fd;
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v4l2_buf_type m_deviceType;
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int m_bufferSize;
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int m_format;
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int m_width;
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int m_height;
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};
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#endif
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