ioctl VIDIOC_ENUMINPUT &manvol; VIDIOC_ENUMINPUT Enumerate video inputs int ioctl int fd int request struct v4l2_input *argp fd &fd; request VIDIOC_ENUMINPUT argp To query the attributes of a video input applications initialize the index field of &v4l2-input; and call the VIDIOC_ENUMINPUT ioctl with a pointer to this structure. Drivers fill the rest of the structure or return an &EINVAL; when the index is out of bounds. To enumerate all inputs applications shall begin at index zero, incrementing by one until the driver returns EINVAL. &cs-str; __u32 index Identifies the input, set by the application. __u8 name[32] Name of the video input, a NUL-terminated ASCII string, for example: "Vin (Composite 2)". This information is intended for the user, preferably the connector label on the device itself. __u32 type Type of the input, see . __u32 audioset Drivers can enumerate up to 32 video and audio inputs. This field shows which audio inputs were selectable as audio source if this was the currently selected video input. It is a bit mask. The LSB corresponds to audio input 0, the MSB to input 31. Any number of bits can be set, or none.When the driver does not enumerate audio inputs no bits must be set. Applications shall not interpret this as lack of audio support. Some drivers automatically select audio sources and do not enumerate them since there is no choice anyway.For details on audio inputs and how to select the current input see . __u32 tuner Capture devices can have zero or more tuners (RF demodulators). When the type is set to V4L2_INPUT_TYPE_TUNER this is an RF connector and this field identifies the tuner. It corresponds to &v4l2-tuner; field index. For details on tuners see . &v4l2-std-id; std Every video input supports one or more different video standards. This field is a set of all supported standards. For details on video standards and how to switch see . __u32 status This field provides status information about the input. See for flags. With the exception of the sensor orientation bits status is only valid when this is the current input. __u32 capabilities This field provides capabilities for the input. See for flags. __u32 reserved[3] Reserved for future extensions. Drivers must set the array to zero. &cs-def; V4L2_INPUT_TYPE_TUNER 1 This input uses a tuner (RF demodulator). V4L2_INPUT_TYPE_CAMERA 2 Analog baseband input, for example CVBS / Composite Video, S-Video, RGB. General V4L2_IN_ST_NO_POWER 0x00000001 Attached device is off. V4L2_IN_ST_NO_SIGNAL 0x00000002 V4L2_IN_ST_NO_COLOR 0x00000004 The hardware supports color decoding, but does not detect color modulation in the signal. Sensor Orientation V4L2_IN_ST_HFLIP 0x00000010 The input is connected to a device that produces a signal that is flipped horizontally and does not correct this before passing the signal to userspace. V4L2_IN_ST_VFLIP 0x00000020 The input is connected to a device that produces a signal that is flipped vertically and does not correct this before passing the signal to userspace. Note that a 180 degree rotation is the same as HFLIP | VFLIP Analog Video V4L2_IN_ST_NO_H_LOCK 0x00000100 No horizontal sync lock. V4L2_IN_ST_COLOR_KILL 0x00000200 A color killer circuit automatically disables color decoding when it detects no color modulation. When this flag is set the color killer is enabled and has shut off color decoding. Digital Video V4L2_IN_ST_NO_SYNC 0x00010000 No synchronization lock. V4L2_IN_ST_NO_EQU 0x00020000 No equalizer lock. V4L2_IN_ST_NO_CARRIER 0x00040000 Carrier recovery failed. VCR and Set-Top Box V4L2_IN_ST_MACROVISION 0x01000000 Macrovision is an analog copy prevention system mangling the video signal to confuse video recorders. When this flag is set Macrovision has been detected. V4L2_IN_ST_NO_ACCESS 0x02000000 Conditional access denied. V4L2_IN_ST_VTR 0x04000000 VTR time constant. [?] &cs-def; V4L2_IN_CAP_PRESETS 0x00000001 This input supports setting DV presets by using VIDIOC_S_DV_PRESET. V4L2_IN_CAP_CUSTOM_TIMINGS 0x00000002 This input supports setting custom video timings by using VIDIOC_S_DV_TIMINGS. V4L2_IN_CAP_STD 0x00000004 This input supports setting the TV standard by using VIDIOC_S_STD. &return-value; EINVAL The &v4l2-input; index is out of bounds.