6.2.2.8. VIDEO_SELECT_SOURCE

6.2.2.8.1. Name

VIDEO_SELECT_SOURCE

注意

This ioctl is deprecated.

6.2.2.8.2. Synopsis

int ioctl(fd, VIDEO_SELECT_SOURCE, video_stream_source_t source)

6.2.2.8.3. Arguments

int fd	File descriptor returned by a previous call to open().
int request	Equals VIDEO_SELECT_SOURCE for this command.
video_stream_source_t source	Indicates which source shall be used for the Video stream.

6.2.2.8.4. Description

This ioctl is for Digital TV devices only. This ioctl was also supported by the V4L2 ivtv driver, but that has been replaced by the ivtv-specific IVTV_IOC_PASSTHROUGH_MODE ioctl.

This ioctl call informs the video device which source shall be used for the input data. The possible sources are demux or memory. If memory is selected, the data is fed to the video device through the write command.

video_stream_source_t

typedef enum {
        VIDEO_SOURCE_DEMUX, /* Select the demux as the main source */
        VIDEO_SOURCE_MEMORY /* If this source is selected, the stream
                        comes from the user through the write
                        system call */
} video_stream_source_t;

6.2.2.8.5. 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.