#pragma once

#include "Device.h"

namespace Video
{
namespace V4L2
{
#define V4L2MMAP_NBBUFFER 10

class MmapDevice: public Device
{
protected:
    size_t writeInternal(char* buffer, size_t bufferSize);
    bool   startPartialWrite();
    size_t writePartialInternal(char*, size_t);
    bool   endPartialWrite();
    size_t readInternal(char* buffer, size_t bufferSize);

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

    virtual bool init(unsigned int mandatoryCapabilities);
    virtual bool isReady()
    {
        return ((m_fd != -1) && (n_buffers != 0));
    }
    virtual bool start();
    virtual bool stop();

protected:
    unsigned int n_buffers;

    struct buffer
    {
        void*  start;
        size_t length;
    };
    buffer m_buffer[V4L2MMAP_NBBUFFER];
};
}
}