p26001-store-acs-soc-fw-app/video/v4l2/Device.h

#pragma once

#include <string>
#include <list>
#include <linux/videodev2.h>
#include <fcntl.h>

#ifndef V4L2_PIX_FMT_VP8
#define V4L2_PIX_FMT_VP8 v4l2_fourcc('V', 'P', '8', '0')
#endif
#ifndef V4L2_PIX_FMT_VP9
#define V4L2_PIX_FMT_VP9 v4l2_fourcc('V', 'P', '9', '0')
#endif
#ifndef V4L2_PIX_FMT_HEVC
#define V4L2_PIX_FMT_HEVC v4l2_fourcc('H', 'E', 'V', 'C')
#endif

namespace Video
{
namespace V4L2
{
enum V4l2IoType
{
    IOTYPE_READWRITE,
    IOTYPE_MMAP
};

struct DeviceParameters
{
    DeviceParameters(const char* devname, const std::list<unsigned int>& formatList, unsigned int width,
                     unsigned int height, int fps, V4l2IoType ioType = IOTYPE_MMAP, int verbose = 0,
                     int openFlags = O_RDWR | O_NONBLOCK)
        : m_devName(devname), m_formatList(formatList), m_width(width), m_height(height), m_fps(fps), m_iotype(ioType),
          m_verbose(verbose), m_openFlags(openFlags)
    {
    }

    DeviceParameters(const char* devname, unsigned int format, unsigned int width, unsigned int height, int fps,
                     V4l2IoType ioType = IOTYPE_MMAP, int verbose = 0, int openFlags = O_RDWR | O_NONBLOCK)
        : m_devName(devname), m_width(width), m_height(height), m_fps(fps), m_iotype(ioType), m_verbose(verbose),
          m_openFlags(openFlags)
    {
        if (format)
        {
            m_formatList.push_back(format);
        }
    }

    std::string             m_devName;
    std::list<unsigned int> m_formatList;
    unsigned int            m_width;
    unsigned int            m_height;
    int                     m_fps;
    V4l2IoType              m_iotype;
    int                     m_verbose;
    int                     m_openFlags;
};

class Device
{
    friend class Capture;
    friend class Output;

protected:
    void close();

    int initdevice(const char* dev_name, unsigned int mandatoryCapabilities);
    int checkCapabilities(int fd, unsigned int mandatoryCapabilities);
    int configureFormat(int fd);
    int configureFormat(int fd, unsigned int format, unsigned int width, unsigned int height);
    int configureParam(int fd, int fps);

    virtual bool   init(unsigned int mandatoryCapabilities);
    virtual size_t writeInternal(char*, size_t)
    {
        return -1;
    }
    virtual bool startPartialWrite()
    {
        return false;
    }
    virtual size_t writePartialInternal(char*, size_t)
    {
        return -1;
    }
    virtual bool endPartialWrite()
    {
        return false;
    }
    virtual size_t readInternal(char*, size_t)
    {
        return -1;
    }

public:
    Device(const DeviceParameters& params, v4l2_buf_type deviceType);
    virtual ~Device();

    virtual bool isReady()
    {
        return (m_fd != -1);
    }
    virtual bool start()
    {
        return true;
    }
    virtual bool stop()
    {
        return true;
    }

    std::string getName()
    {
        return m_name;
    }
    unsigned int getBufferSize()
    {
        return m_bufferSize;
    }
    unsigned int getFormat()
    {
        return m_format;
    }
    unsigned int getWidth()
    {
        return m_width;
    }
    unsigned int getHeight()
    {
        return m_height;
    }
    int getFd()
    {
        return m_fd;
    }
    void queryFormat();

    int setFormat(unsigned int format, unsigned int width, unsigned int height)
    {
        return this->configureFormat(m_fd, format, width, height);
    }
    int setFps(int fps)
    {
        return this->configureParam(m_fd, fps);
    }

    static std::string  fourcc(unsigned int format);
    static unsigned int fourcc(const char* format);

protected:
    DeviceParameters m_params;
    int              m_fd;
    v4l2_buf_type    m_deviceType;

    unsigned int m_bufferSize;
    unsigned int m_format;
    unsigned int m_width;
    unsigned int m_height;

    struct v4l2_buffer m_partialWriteBuf;
    bool               m_partialWriteInProgress;
    std::string        m_name;
};
}
}