capabilities 字段字段：V4L2设备具备的能力

妖狐艹你老母 2024-03-27 11:23 60阅读 0赞

/\* Values for ‘capabilities’ field */  
\#define V4L2\_CAP\_VIDEO\_CAPTURE 0x00000001 /* Is a video capture device */  
\#define V4L2\_CAP\_VIDEO\_OUTPUT 0x00000002 /* Is a video output device */  
\#define V4L2\_CAP\_VIDEO\_OVERLAY 0x00000004 /* Can do video overlay */  
\#define V4L2\_CAP\_VBI\_CAPTURE 0x00000010 /* Is a raw VBI capture device */  
\#define V4L2\_CAP\_VBI\_OUTPUT 0x00000020 /* Is a raw VBI output device */  
\#define V4L2\_CAP\_SLICED\_VBI\_CAPTURE 0x00000040 /* Is a sliced VBI capture device */  
\#define V4L2\_CAP\_SLICED\_VBI\_OUTPUT 0x00000080 /* Is a sliced VBI output device */  
\#define V4L2\_CAP\_RDS\_CAPTURE 0x00000100 /* RDS data capture */  
\#define V4L2\_CAP\_VIDEO\_OUTPUT\_OVERLAY 0x00000200 /* Can do video output overlay */  
\#define V4L2\_CAP\_HW\_FREQ\_SEEK 0x00000400 /* Can do hardware frequency seek */  
\#define V4L2\_CAP\_RDS\_OUTPUT 0x00000800 /* Is an RDS encoder \*/

/\* Is a video capture device that supports multiplanar formats */  
\#define V4L2\_CAP\_VIDEO\_CAPTURE\_MPLANE 0x00001000  
/* Is a video output device that supports multiplanar formats */  
\#define V4L2\_CAP\_VIDEO\_OUTPUT\_MPLANE 0x00002000  
/* Is a video mem-to-mem device that supports multiplanar formats */  
\#define V4L2\_CAP\_VIDEO\_M2M\_MPLANE 0x00004000  
/* Is a video mem-to-mem device \*/  
\#define V4L2\_CAP\_VIDEO\_M2M 0x00008000

\#define V4L2\_CAP\_TUNER 0x00010000 /\* has a tuner */  
\#define V4L2\_CAP\_AUDIO 0x00020000 /* has audio support */  
\#define V4L2\_CAP\_RADIO 0x00040000 /* is a radio device */  
\#define V4L2\_CAP\_MODULATOR 0x00080000 /* has a modulator \*/

\#define V4L2\_CAP\_SDR\_CAPTURE 0x00100000 /\* Is a SDR capture device */  
\#define V4L2\_CAP\_EXT\_PIX\_FORMAT 0x00200000 /* Supports the extended pixel format \*/

\#define V4L2\_CAP\_READWRITE 0x01000000 /\* read/write systemcalls */  
\#define V4L2\_CAP\_ASYNCIO 0x02000000 /* async I/O */  
\#define V4L2\_CAP\_STREAMING 0x04000000 /* streaming I/O ioctls \*/

\#define V4L2\_CAP\_DEVICE\_CAPS 0x80000000 /\* sets device capabilities field \*/