int ioctl(fd, int request = VIDEO_SET_SPU, video_spu_t *spu) Arguments

int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_SET_SPU for this command.
video_spu_t *spu SPU decoding (de)activation and subid setting according to section ??. Description

This ioctl activates or deactivates SPU decoding in a DVD input stream. It can only be used, if the driver is able to handle a DVD stream. 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 input is not a valid spu setting or driver cannot handle SPU.