/// <summary>
/// Creates a buffer to be used with Video4Linux streaming I/O.
/// </summary>
/// <param name="device">The parental Video4Linux device.</param>
/// <param name="buffer">The struct holding the buffer information.</param>
internal V4LBuffer(V4LDevice device, v4l2_buffer buffer)
{
this.device = device;
this.buffer = buffer;
mapMemory();
}
private void threadTest()
{
APIv2.v4l2_buffer buf = new APIv2.v4l2_buffer();
buf.type = Buffers[0].Type;
buf.memory = Buffers[0].Memory;
while (ioControl.DequeueBuffer(ref buf) == 0)
{
V4LBuffer dbuf = Buffers[(int)buf.index];
// invoke the event
if (BufferFilled != null)
BufferFilled(this, dbuf);
// Re-enqueue the buffer
dbuf.Enqueue();
}
}
private void fetchBuffers(APIv2.v4l2_requestbuffers req)
{
for (uint i=0; i<req.count; i++)
{
APIv2.v4l2_buffer buffer = new APIv2.v4l2_buffer();
buffer.index = i;
buffer.type = req.type;
buffer.memory = req.memory;
if (ioControl.QueryBuffer(ref buffer) < 0)
throw new Exception("VIDIOC_QUERYBUF");
buffers.Add(new V4LBuffer(this, buffer));
}
}
/// <summary>
/// Tries to dequeue a buffer and fires the 'BufferFilled' event if the buffer was filled by the driver.
/// </summary>
private void captureFromBuffers()
{
v4l2_buffer buf = new v4l2_buffer();
buf.type = Buffers[0].Type;
buf.memory = Buffers[0].Memory;
while (ioControl.DequeueBuffer(ref buf) == 0)
{
V4LBuffer dbuf = Buffers[(int)buf.index];
// invoke the event
if (BufferFilled != null)
BufferFilled(this, dbuf);
// re-enqueue the buffer
dbuf.Enqueue();
}
}
/// <summary>
/// Calls VIDIOC_QBUF.
/// </summary>
public int EnqueueBuffer(ref v4l2_buffer buffer)
{
return ioctl(deviceHandle, v4l2_operation.EnqueueBuffer, ref buffer);
}
private static extern int ioctl(int device, v4l2_operation request, ref v4l2_buffer argp);
/// <summary>
/// Calls VIDIOC_QUERYBUF.
/// </summary>
public int QueryBuffer(ref v4l2_buffer buffer)
{
return ioctl(deviceHandle, v4l2_operation.QueryBuffer, ref buffer);
}