int ioctl(fd, int request = AUDIO_SET_EXT_ID, int id) Arguments

int fd File descriptor returned by a previous call to open().
int request Equals AUDIO_SET_EXT_ID for this command.
int id audio sub_stream_id Description

This ioctl can be used to set the extension id for MPEG streams in DVD playback. Only the first 3 bits are recognized. Return Value

On success 0 is returned, on error -1 and the errno variable is set appropriately. The generic error codes are described at the Generic Error Codes chapter.

EINVAL id is not a valid id.