int ioctl(int fd, int request = AUDIO_BILINGUAL_CHANNEL_SELECT, audio_channel_select_t) Arguments

int fd File descriptor returned by a previous call to open().
int request Equals AUDIO_BILINGUAL_CHANNEL_SELECT for this command.
audio_channel_select_t ch Select the output format of the audio (mono left/right, stereo). Description

This ioctl is obsolete. Do not use in new drivers. It has been replaced by the V4L2 V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK control for MPEG decoders controlled through V4L2.

This ioctl call asks the Audio Device to select the requested channel for bilingual streams if possible. 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.