V4L2设备可用的指令

ゝ一世哀愁。 2024-03-27 11:04 84阅读 0赞

在 videodev2.h 头文件中，定义了很多 ioctl()的指令，以宏定义的形式提供（VIDIOC\_XXX），如下所示：  
\#define VIDIOC\_QUERYCAP \_IOR(‘V’, 0, struct v4l2\_capability)  
\#define VIDIOC\_RESERVED \_IO(‘V’, 1)  
\#define VIDIOC\_ENUM\_FMT \_IOWR(‘V’, 2, struct v4l2\_fmtdesc)  
\#define VIDIOC\_G\_FMT \_IOWR(‘V’, 4, struct v4l2\_format)  
\#define VIDIOC\_S\_FMT \_IOWR(‘V’, 5, struct v4l2\_format)  
\#define VIDIOC\_REQBUFS \_IOWR(‘V’, 8, struct v4l2\_requestbuffers)  
\#define VIDIOC\_QUERYBUF \_IOWR(‘V’, 9, struct v4l2\_buffer)  
\#define VIDIOC\_G\_FBUF \_IOR(‘V’, 10, struct v4l2\_framebuffer)  
\#define VIDIOC\_S\_FBUF \_IOW(‘V’, 11, struct v4l2\_framebuffer)  
\#define VIDIOC\_OVERLAY \_IOW(‘V’, 14, int)  
\#define VIDIOC\_QBUF \_IOWR(‘V’, 15, struct v4l2\_buffer)  
\#define VIDIOC\_EXPBUF \_IOWR(‘V’, 16, struct v4l2\_exportbuffer)  
\#define VIDIOC\_DQBUF \_IOWR(‘V’, 17, struct v4l2\_buffer)  
\#define VIDIOC\_STREAMON \_IOW(‘V’, 18, int)  
\#define VIDIOC\_STREAMOFF \_IOW(‘V’, 19, int)  
\#define VIDIOC\_G\_PARM \_IOWR(‘V’, 21, struct v4l2\_streamparm)  
\#define VIDIOC\_S\_PARM \_IOWR(‘V’, 22, struct v4l2\_streamparm)  
\#define VIDIOC\_G\_STD \_IOR(‘V’, 23, v4l2\_std\_id)  
\#define VIDIOC\_S\_STD \_IOW(‘V’, 24, v4l2\_std\_id)  
\#define VIDIOC\_ENUMSTD \_IOWR(‘V’, 25, struct v4l2\_standard)  
\#define VIDIOC\_ENUMINPUT \_IOWR(‘V’, 26, struct v4l2\_input)  
\#define VIDIOC\_G\_CTRL \_IOWR(‘V’, 27, struct v4l2\_control)  
\#define VIDIOC\_S\_CTRL \_IOWR(‘V’, 28, struct v4l2\_control)  
\#define VIDIOC\_G\_TUNER \_IOWR(‘V’, 29, struct v4l2\_tuner)  
\#define VIDIOC\_S\_TUNER \_IOW(‘V’, 30, struct v4l2\_tuner)  
\#define VIDIOC\_G\_AUDIO \_IOR(‘V’, 33, struct v4l2\_audio)  
\#define VIDIOC\_S\_AUDIO \_IOW(‘V’, 34, struct v4l2\_audio)  
\#define VIDIOC\_QUERYCTRL \_IOWR(‘V’, 36, struct v4l2\_queryctrl)  
\#define VIDIOC\_QUERYMENU \_IOWR(‘V’, 37, struct v4l2\_querymenu)  
\#define VIDIOC\_G\_INPUT \_IOR(‘V’, 38, int)  
\#define VIDIOC\_S\_INPUT \_IOWR(‘V’, 39, int)  
\#define VIDIOC\_G\_EDID \_IOWR(‘V’, 40, struct v4l2\_edid)  
\#define VIDIOC\_S\_EDID \_IOWR(‘V’, 41, struct v4l2\_edid)  
\#define VIDIOC\_G\_OUTPUT \_IOR(‘V’, 46, int)  
\#define VIDIOC\_S\_OUTPUT \_IOWR(‘V’, 47, int)  
\#define VIDIOC\_ENUMOUTPUT \_IOWR(‘V’, 48, struct v4l2\_output)  
\#define VIDIOC\_G\_AUDOUT \_IOR(‘V’, 49, struct v4l2\_audioout)  
\#define VIDIOC\_S\_AUDOUT \_IOW(‘V’, 50, struct v4l2\_audioout)  
\#define VIDIOC\_G\_MODULATOR \_IOWR(‘V’, 54, struct v4l2\_modulator)  
\#define VIDIOC\_S\_MODULATOR \_IOW(‘V’, 55, struct v4l2\_modulator)  
\#define VIDIOC\_G\_FREQUENCY \_IOWR(‘V’, 56, struct v4l2\_frequency)  
\#define VIDIOC\_S\_FREQUENCY \_IOW(‘V’, 57, struct v4l2\_frequency)  
\#define VIDIOC\_CROPCAP \_IOWR(‘V’, 58, struct v4l2\_cropcap)  
\#define VIDIOC\_G\_CROP \_IOWR(‘V’, 59, struct v4l2\_crop)  
\#define VIDIOC\_S\_CROP \_IOW(‘V’, 60, struct v4l2\_crop)  
\#define VIDIOC\_G\_JPEGCOMP \_IOR(‘V’, 61, struct v4l2\_jpegcompression)  
\#define VIDIOC\_S\_JPEGCOMP \_IOW(‘V’, 62, struct v4l2\_jpegcompression)  
\#define VIDIOC\_QUERYSTD \_IOR(‘V’, 63, v4l2\_std\_id)  
\#define VIDIOC\_TRY\_FMT \_IOWR(‘V’, 64, struct v4l2\_format)  
\#define VIDIOC\_ENUMAUDIO \_IOWR(‘V’, 65, struct v4l2\_audio)  
\#define VIDIOC\_ENUMAUDOUT \_IOWR(‘V’, 66, struct v4l2\_audioout)  
\#define VIDIOC\_G\_PRIORITY \_IOR(‘V’, 67, \_\_u32) /\* enum v4l2\_priority */  
\#define VIDIOC\_S\_PRIORITY \_IOW(‘V’, 68, \_\_u32) /* enum v4l2\_priority \*/  
\#define VIDIOC\_G\_SLICED\_VBI\_CAP \_IOWR(‘V’, 69, struct v4l2\_sliced\_vbi\_cap)  
\#define VIDIOC\_LOG\_STATUS \_IO(‘V’, 70)  
\#define VIDIOC\_G\_EXT\_CTRLS \_IOWR(‘V’, 71, struct v4l2\_ext\_controls)  
\#define VIDIOC\_S\_EXT\_CTRLS \_IOWR(‘V’, 72, struct v4l2\_ext\_controls)  
\#define VIDIOC\_TRY\_EXT\_CTRLS \_IOWR(‘V’, 73, struct v4l2\_ext\_controls)  
\#define VIDIOC\_ENUM\_FRAMESIZES \_IOWR(‘V’, 74, struct v4l2\_frmsizeenum)  
\#define VIDIOC\_ENUM\_FRAMEINTERVALS \_IOWR(‘V’, 75, struct v4l2\_frmivalenum)  
\#define VIDIOC\_G\_ENC\_INDEX \_IOR(‘V’, 76, struct v4l2\_enc\_idx)  
\#define VIDIOC\_ENCODER\_CMD \_IOWR(‘V’, 77, struct v4l2\_encoder\_cmd)  
\#define VIDIOC\_TRY\_ENCODER\_CMD \_IOWR(‘V’, 78, struct v4l2\_encoder\_cmd)

/\* Experimental, meant for debugging, testing and internal use.  
Only implemented if CONFIG\_VIDEO\_ADV\_DEBUG is defined.  
You must be root to use these ioctls. Never use these in applications! \*/  
\#define VIDIOC\_DBG\_S\_REGISTER \_IOW(‘V’, 79, struct v4l2\_dbg\_register)  
\#define VIDIOC\_DBG\_G\_REGISTER \_IOWR(‘V’, 80, struct v4l2\_dbg\_register)

/\* Experimental, meant for debugging, testing and internal use.  
Never use this ioctl in applications!  
Note: this ioctl is deprecated in favor of VIDIOC\_DBG\_G\_CHIP\_INFO and  
will go away in the future. \*/  
\#define VIDIOC\_DBG\_G\_CHIP\_IDENT \_IOWR(‘V’, 81, struct v4l2\_dbg\_chip\_ident)

\#define VIDIOC\_S\_HW\_FREQ\_SEEK \_IOW(‘V’, 82, struct v4l2\_hw\_freq\_seek)

\#define VIDIOC\_S\_DV\_TIMINGS \_IOWR(‘V’, 87, struct v4l2\_dv\_timings)  
\#define VIDIOC\_G\_DV\_TIMINGS \_IOWR(‘V’, 88, struct v4l2\_dv\_timings)  
\#define VIDIOC\_DQEVENT \_IOR(‘V’, 89, struct v4l2\_event)  
\#define VIDIOC\_SUBSCRIBE\_EVENT \_IOW(‘V’, 90, struct v4l2\_event\_subscription)  
\#define VIDIOC\_UNSUBSCRIBE\_EVENT \_IOW(‘V’, 91, struct v4l2\_event\_subscription)

/\* Experimental, the below two ioctls may change over the next couple of kernel  
versions \*/  
\#define VIDIOC\_CREATE\_BUFS \_IOWR(‘V’, 92, struct v4l2\_create\_buffers)  
\#define VIDIOC\_PREPARE\_BUF \_IOWR(‘V’, 93, struct v4l2\_buffer)

/\* Experimental selection API \*/  
\#define VIDIOC\_G\_SELECTION \_IOWR(‘V’, 94, struct v4l2\_selection)  
\#define VIDIOC\_S\_SELECTION \_IOWR(‘V’, 95, struct v4l2\_selection)

/\* Experimental, these two ioctls may change over the next couple of kernel  
versions. \*/  
\#define VIDIOC\_DECODER\_CMD \_IOWR(‘V’, 96, struct v4l2\_decoder\_cmd)  
\#define VIDIOC\_TRY\_DECODER\_CMD \_IOWR(‘V’, 97, struct v4l2\_decoder\_cmd)

/\* Experimental, these three ioctls may change over the next couple of kernel  
versions. \*/  
\#define VIDIOC\_ENUM\_DV\_TIMINGS \_IOWR(‘V’, 98, struct v4l2\_enum\_dv\_timings)  
\#define VIDIOC\_QUERY\_DV\_TIMINGS \_IOR(‘V’, 99, struct v4l2\_dv\_timings)  
\#define VIDIOC\_DV\_TIMINGS\_CAP \_IOWR(‘V’, 100, struct v4l2\_dv\_timings\_cap)

/\* Experimental, this ioctl may change over the next couple of kernel  
versions. \*/  
\#define VIDIOC\_ENUM\_FREQ\_BANDS \_IOWR(‘V’, 101, struct v4l2\_frequency\_band)

/\* Experimental, meant for debugging, testing and internal use.  
Never use these in applications! \*/  
\#define VIDIOC\_DBG\_G\_CHIP\_INFO \_IOWR(‘V’, 102, struct v4l2\_dbg\_chip\_info)

\#define VIDIOC\_QUERY\_EXT\_CTRL \_IOWR(‘V’, 103, struct v4l2\_query\_ext\_ctrl)