📄 videodev2.h
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struct v4l2_bitrate { /* rates are specified in kbit/sec */ enum v4l2_bitrate_mode mode; __u32 min; __u32 target; /* use this one for CBR */ __u32 max;};enum v4l2_mpeg_streamtype { V4L2_MPEG_SS_1, /* MPEG-1 system stream */ V4L2_MPEG_PS_2, /* MPEG-2 program stream */ V4L2_MPEG_TS_2, /* MPEG-2 transport stream */ V4L2_MPEG_PS_DVD, /* MPEG-2 program stream with DVD header fixups */};enum v4l2_mpeg_audiotype { V4L2_MPEG_AU_2_I, /* MPEG-2 layer 1 */ V4L2_MPEG_AU_2_II, /* MPEG-2 layer 2 */ V4L2_MPEG_AU_2_III, /* MPEG-2 layer 3 */ V4L2_MPEG_AC3, /* AC3 */ V4L2_MPEG_LPCM, /* LPCM */};enum v4l2_mpeg_videotype { V4L2_MPEG_VI_1, /* MPEG-1 */ V4L2_MPEG_VI_2, /* MPEG-2 */};enum v4l2_mpeg_aspectratio { V4L2_MPEG_ASPECT_SQUARE = 1, /* square pixel */ V4L2_MPEG_ASPECT_4_3 = 2, /* 4 : 3 */ V4L2_MPEG_ASPECT_16_9 = 3, /* 16 : 9 */ V4L2_MPEG_ASPECT_1_221 = 4, /* 1 : 2,21 */};struct v4l2_mpeg_compression { /* general */ enum v4l2_mpeg_streamtype st_type; struct v4l2_bitrate st_bitrate; /* transport streams */ __u16 ts_pid_pmt; __u16 ts_pid_audio; __u16 ts_pid_video; __u16 ts_pid_pcr; /* program stream */ __u16 ps_size; __u16 reserved_1; /* align */ /* audio */ enum v4l2_mpeg_audiotype au_type; struct v4l2_bitrate au_bitrate; __u32 au_sample_rate; __u8 au_pesid; __u8 reserved_2[3]; /* align */ /* video */ enum v4l2_mpeg_videotype vi_type; enum v4l2_mpeg_aspectratio vi_aspect_ratio; struct v4l2_bitrate vi_bitrate; __u32 vi_frame_rate; __u16 vi_frames_per_gop; __u16 vi_bframes_count; __u8 vi_pesid; __u8 reserved_3[3]; /* align */ /* misc flags */ __u32 closed_gops:1; __u32 pulldown:1; __u32 reserved_4:30; /* align */ /* I don't expect the above being perfect yet ;) */ __u32 reserved_5[8];};#endifstruct v4l2_jpegcompression{ int quality; int APPn; /* Number of APP segment to be written, * must be 0..15 */ int APP_len; /* Length of data in JPEG APPn segment */ char APP_data[60]; /* Data in the JPEG APPn segment. */ int COM_len; /* Length of data in JPEG COM segment */ char COM_data[60]; /* Data in JPEG COM segment */ __u32 jpeg_markers; /* Which markers should go into the JPEG * output. Unless you exactly know what * you do, leave them untouched. * Inluding less markers will make the * resulting code smaller, but there will * be fewer aplications which can read it. * The presence of the APP and COM marker * is influenced by APP_len and COM_len * ONLY, not by this property! */#define V4L2_JPEG_MARKER_DHT (1<<3) /* Define Huffman Tables */#define V4L2_JPEG_MARKER_DQT (1<<4) /* Define Quantization Tables */#define V4L2_JPEG_MARKER_DRI (1<<5) /* Define Restart Interval */#define V4L2_JPEG_MARKER_COM (1<<6) /* Comment segment */#define V4L2_JPEG_MARKER_APP (1<<7) /* App segment, driver will * allways use APP0 */};/* * M E M O R Y - M A P P I N G B U F F E R S */struct v4l2_requestbuffers{ __u32 count; enum v4l2_buf_type type; enum v4l2_memory memory; __u32 reserved[2];};struct v4l2_buffer{ __u32 index; enum v4l2_buf_type type; __u32 bytesused; __u32 flags; enum v4l2_field field; struct timeval timestamp; struct v4l2_timecode timecode; __u32 sequence; /* memory location */ enum v4l2_memory memory; union { __u32 offset; unsigned long userptr; } m; __u32 length; __u32 input; __u32 reserved;};/* Flags for 'flags' field */#define V4L2_BUF_FLAG_MAPPED 0x0001 /* Buffer is mapped (flag) */#define V4L2_BUF_FLAG_QUEUED 0x0002 /* Buffer is queued for processing */#define V4L2_BUF_FLAG_DONE 0x0004 /* Buffer is ready */#define V4L2_BUF_FLAG_KEYFRAME 0x0008 /* Image is a keyframe (I-frame) */#define V4L2_BUF_FLAG_PFRAME 0x0010 /* Image is a P-frame */#define V4L2_BUF_FLAG_BFRAME 0x0020 /* Image is a B-frame */#define V4L2_BUF_FLAG_TIMECODE 0x0100 /* timecode field is valid */#define V4L2_BUF_FLAG_INPUT 0x0200 /* input field is valid *//* * O V E R L A Y P R E V I E W */struct v4l2_framebuffer{ __u32 capability; __u32 flags;/* FIXME: in theory we should pass something like PCI device + memory * region + offset instead of some physical address */ void* base; struct v4l2_pix_format fmt;};/* Flags for the 'capability' field. Read only */#define V4L2_FBUF_CAP_EXTERNOVERLAY 0x0001#define V4L2_FBUF_CAP_CHROMAKEY 0x0002#define V4L2_FBUF_CAP_LIST_CLIPPING 0x0004#define V4L2_FBUF_CAP_BITMAP_CLIPPING 0x0008/* Flags for the 'flags' field. */#define V4L2_FBUF_FLAG_PRIMARY 0x0001#define V4L2_FBUF_FLAG_OVERLAY 0x0002#define V4L2_FBUF_FLAG_CHROMAKEY 0x0004struct v4l2_clip{ struct v4l2_rect c; struct v4l2_clip __user *next;};struct v4l2_window{ struct v4l2_rect w; enum v4l2_field field; __u32 chromakey; struct v4l2_clip __user *clips; __u32 clipcount; void __user *bitmap;};/* * C A P T U R E P A R A M E T E R S */struct v4l2_captureparm{ __u32 capability; /* Supported modes */ __u32 capturemode; /* Current mode */ struct v4l2_fract timeperframe; /* Time per frame in .1us units */ __u32 extendedmode; /* Driver-specific extensions */ __u32 readbuffers; /* # of buffers for read */ __u32 reserved[4];};/* Flags for 'capability' and 'capturemode' fields */#define V4L2_MODE_HIGHQUALITY 0x0001 /* High quality imaging mode */#define V4L2_CAP_TIMEPERFRAME 0x1000 /* timeperframe field is supported */struct v4l2_outputparm{ __u32 capability; /* Supported modes */ __u32 outputmode; /* Current mode */ struct v4l2_fract timeperframe; /* Time per frame in seconds */ __u32 extendedmode; /* Driver-specific extensions */ __u32 writebuffers; /* # of buffers for write */ __u32 reserved[4];};/* * I N P U T I M A G E C R O P P I N G */struct v4l2_cropcap { enum v4l2_buf_type type; struct v4l2_rect bounds; struct v4l2_rect defrect; struct v4l2_fract pixelaspect;};struct v4l2_crop { enum v4l2_buf_type type; struct v4l2_rect c;};/* * A N A L O G V I D E O S T A N D A R D */typedef __u64 v4l2_std_id;/* one bit for each */#define V4L2_STD_PAL_B ((v4l2_std_id)0x00000001)#define V4L2_STD_PAL_B1 ((v4l2_std_id)0x00000002)#define V4L2_STD_PAL_G ((v4l2_std_id)0x00000004)#define V4L2_STD_PAL_H ((v4l2_std_id)0x00000008)#define V4L2_STD_PAL_I ((v4l2_std_id)0x00000010)#define V4L2_STD_PAL_D ((v4l2_std_id)0x00000020)#define V4L2_STD_PAL_D1 ((v4l2_std_id)0x00000040)#define V4L2_STD_PAL_K ((v4l2_std_id)0x00000080)#define V4L2_STD_PAL_M ((v4l2_std_id)0x00000100)#define V4L2_STD_PAL_N ((v4l2_std_id)0x00000200)#define V4L2_STD_PAL_Nc ((v4l2_std_id)0x00000400)#define V4L2_STD_PAL_60 ((v4l2_std_id)0x00000800)#define V4L2_STD_NTSC_M ((v4l2_std_id)0x00001000)#define V4L2_STD_NTSC_M_JP ((v4l2_std_id)0x00002000)#define V4L2_STD_NTSC_443 ((v4l2_std_id)0x00004000)#define V4L2_STD_NTSC_M_KR ((v4l2_std_id)0x00008000)#define V4L2_STD_SECAM_B ((v4l2_std_id)0x00010000)#define V4L2_STD_SECAM_D ((v4l2_std_id)0x00020000)#define V4L2_STD_SECAM_G ((v4l2_std_id)0x00040000)#define V4L2_STD_SECAM_H ((v4l2_std_id)0x00080000)#define V4L2_STD_SECAM_K ((v4l2_std_id)0x00100000)#define V4L2_STD_SECAM_K1 ((v4l2_std_id)0x00200000)#define V4L2_STD_SECAM_L ((v4l2_std_id)0x00400000)#define V4L2_STD_SECAM_LC ((v4l2_std_id)0x00800000)/* ATSC/HDTV */#define V4L2_STD_ATSC_8_VSB ((v4l2_std_id)0x01000000)#define V4L2_STD_ATSC_16_VSB ((v4l2_std_id)0x02000000)/* some merged standards */#define V4L2_STD_MN (V4L2_STD_PAL_M|V4L2_STD_PAL_N|V4L2_STD_PAL_Nc|V4L2_STD_NTSC)#define V4L2_STD_B (V4L2_STD_PAL_B|V4L2_STD_PAL_B1|V4L2_STD_SECAM_B)#define V4L2_STD_GH (V4L2_STD_PAL_G|V4L2_STD_PAL_H|V4L2_STD_SECAM_G|V4L2_STD_SECAM_H)#define V4L2_STD_DK (V4L2_STD_PAL_DK|V4L2_STD_SECAM_DK)/* some common needed stuff */#define V4L2_STD_PAL_BG (V4L2_STD_PAL_B |\ V4L2_STD_PAL_B1 |\ V4L2_STD_PAL_G)#define V4L2_STD_PAL_DK (V4L2_STD_PAL_D |\ V4L2_STD_PAL_D1 |\ V4L2_STD_PAL_K)#define V4L2_STD_PAL (V4L2_STD_PAL_BG |\ V4L2_STD_PAL_DK |\ V4L2_STD_PAL_H |\ V4L2_STD_PAL_I)#define V4L2_STD_NTSC (V4L2_STD_NTSC_M |\ V4L2_STD_NTSC_M_JP |\ V4L2_STD_NTSC_M_KR)#define V4L2_STD_SECAM_DK (V4L2_STD_SECAM_D |\ V4L2_STD_SECAM_K |\ V4L2_STD_SECAM_K1)#define V4L2_STD_SECAM (V4L2_STD_SECAM_B |\ V4L2_STD_SECAM_G |\ V4L2_STD_SECAM_H |\ V4L2_STD_SECAM_DK |\ V4L2_STD_SECAM_L |\ V4L2_STD_SECAM_LC)#define V4L2_STD_525_60 (V4L2_STD_PAL_M |\ V4L2_STD_PAL_60 |\ V4L2_STD_NTSC |\ V4L2_STD_NTSC_443)#define V4L2_STD_625_50 (V4L2_STD_PAL |\ V4L2_STD_PAL_N |\ V4L2_STD_PAL_Nc |\ V4L2_STD_SECAM)#define V4L2_STD_ATSC (V4L2_STD_ATSC_8_VSB |\ V4L2_STD_ATSC_16_VSB)#define V4L2_STD_UNKNOWN 0#define V4L2_STD_ALL (V4L2_STD_525_60 |\ V4L2_STD_625_50)struct v4l2_standard{ __u32 index; v4l2_std_id id; __u8 name[24]; struct v4l2_fract frameperiod; /* Frames, not fields */ __u32 framelines; __u32 reserved[4];};/* * V I D E O I N P U T S */struct v4l2_input{ __u32 index; /* Which input */ __u8 name[32]; /* Label */ __u32 type; /* Type of input */ __u32 audioset; /* Associated audios (bitfield) */ __u32 tuner; /* Associated tuner */ v4l2_std_id std; __u32 status; __u32 reserved[4];};/* Values for the 'type' field */#define V4L2_INPUT_TYPE_TUNER 1#define V4L2_INPUT_TYPE_CAMERA 2/* field 'status' - general */#define V4L2_IN_ST_NO_POWER 0x00000001 /* Attached device is off */#define V4L2_IN_ST_NO_SIGNAL 0x00000002#define V4L2_IN_ST_NO_COLOR 0x00000004/* field 'status' - analog */#define V4L2_IN_ST_NO_H_LOCK 0x00000100 /* No horizontal sync lock */#define V4L2_IN_ST_COLOR_KILL 0x00000200 /* Color killer is active *//* field 'status' - digital */#define V4L2_IN_ST_NO_SYNC 0x00010000 /* No synchronization lock */#define V4L2_IN_ST_NO_EQU 0x00020000 /* No equalizer lock */#define V4L2_IN_ST_NO_CARRIER 0x00040000 /* Carrier recovery failed *//* field 'status' - VCR and set-top box */#define V4L2_IN_ST_MACROVISION 0x01000000 /* Macrovision detected */#define V4L2_IN_ST_NO_ACCESS 0x02000000 /* Conditional access denied */#define V4L2_IN_ST_VTR 0x04000000 /* VTR time constant *//* * V I D E O O U T P U T S */struct v4l2_output{ __u32 index; /* Which output */ __u8 name[32]; /* Label */ __u32 type; /* Type of output */ __u32 audioset; /* Associated audios (bitfield) */ __u32 modulator; /* Associated modulator */ v4l2_std_id std; __u32 reserved[4];};/* Values for the 'type' field */#define V4L2_OUTPUT_TYPE_MODULATOR 1#define V4L2_OUTPUT_TYPE_ANALOG 2#define V4L2_OUTPUT_TYPE_ANALOGVGAOVERLAY 3/* * C O N T R O L S */struct v4l2_control{ __u32 id; __s32 value;};/* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */struct v4l2_queryctrl{ __u32 id; enum v4l2_ctrl_type type; __u8 name[32]; /* Whatever */ __s32 minimum; /* Note signedness */ __s32 maximum; __s32 step; __s32 default_value; __u32 flags; __u32 reserved[2];};/* Used in the VIDIOC_QUERYMENU ioctl for querying menu items */struct v4l2_querymenu{ __u32 id; __u32 index; __u8 name[32]; /* Whatever */ __u32 reserved;};/* Control flags */#define V4L2_CTRL_FLAG_DISABLED 0x0001#define V4L2_CTRL_FLAG_GRABBED 0x0002/* Control IDs defined by V4L2 */#define V4L2_CID_BASE 0x00980900/* IDs reserved for driver specific controls */#define V4L2_CID_PRIVATE_BASE 0x08000000#define V4L2_CID_BRIGHTNESS (V4L2_CID_BASE+0)#define V4L2_CID_CONTRAST (V4L2_CID_BASE+1)⌨️ 快捷键说明
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