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#include "v4lvideobuffer.h"

#include <linux/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/mman.h>


V4LVideoBuffer::V4LVideoBuffer(unsigned char *buffer, int fd, v4l2_buffer buf)
    : QAbstractVideoBuffer(NoHandle)
    , m_buffer(buffer)
    , m_length(buf.bytesused)
    , m_fd(fd)
    , m_bytesPerLine(0)
    , m_mode(NotMapped)
    , m_buf(buf)
{
}

V4LVideoBuffer::~V4LVideoBuffer()
{
    ioctl(m_fd, VIDIOC_QBUF, &m_buf);
}

void V4LVideoBuffer::setBytesPerLine(int bytesPerLine)
{
    m_bytesPerLine = bytesPerLine;
}

QAbstractVideoBuffer::MapMode V4LVideoBuffer::mapMode() const
{
    return m_mode;
}

uchar *V4LVideoBuffer::map(MapMode mode, int *numBytes, int *bytesPerLine)
{
    if (mode != NotMapped && m_mode == NotMapped) {
        if (numBytes)
            *numBytes = m_length;

        m_mode = mode;

        if(bytesPerLine)
            *bytesPerLine = m_bytesPerLine;

        return m_buffer;
    } else {
        return 0;
    }
}
void V4LVideoBuffer::unmap()
{
    m_mode = NotMapped;
}