ivtv_enqueue
ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
ivtv_enqueue(s, buf, &q);
ivtv_enqueue(s, buf, &q);
ivtv_enqueue(s, buf, &s->q_full);
ivtv_enqueue(s, buf, &s->q_io);
ivtv_enqueue(s, buf, &s->q_full);
ivtv_enqueue(s, buf, &s->q_free);
ivtv_enqueue(s, buf, &s->q_free);
ivtv_enqueue(s, buf, &s->q_free);
void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);