POLLWRNORM        289 libavcodec/v4l2_context.c         .events =  POLLIN | POLLRDNORM | POLLPRI | POLLOUT | POLLWRNORM, /* default blocking capture */
POLLWRNORM        324 libavcodec/v4l2_context.c         pfd.events =  POLLOUT | POLLWRNORM;
POLLWRNORM        373 libavcodec/v4l2_context.c     if (pfd.revents & (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)) {
POLLWRNORM        383 libavcodec/v4l2_context.c             if (pfd.revents & (POLLOUT | POLLWRNORM))