saa7146_buffer_next
saa7146_buffer_next(dev, q, 0);
saa7146_buffer_next(dev, &vv->vbi_dmaq, 1);
saa7146_buffer_next(dev,q,0);
void saa7146_buffer_next(struct saa7146_dev *dev, struct saa7146_dmaqueue *q,int vbi);