videodev2.h

vlc源码

#ifndef __LINUX_VIDEODEV2_H
#define __LINUX_VIDEODEV2_H
/*
 *    Video for Linux Two
 *
 *    Header file for v4l or V4L2 drivers and applications, for
 *    Linux kernels 2.2.x or 2.4.x.
 *
 *    See http://bytesex.org/v4l/ for API specs and other
 *    v4l2 documentation.
 *
 *    Author: Bill Dirks <[e-mail]>
 *        Justin Schoeman
 *        et al.
 */

/*
 *    M I S C E L L A N E O U S
 */

/*  Four-character-code (FOURCC) */
#define v4l2_fourcc(a,b,c,d)\
        (((__u32)(a)<<0)|((__u32)(b)<<8)|((__u32)(c)<<16)|((__u32)(d)<<24))

/*
 *    E N U M S
 */
enum v4l2_field {
    V4L2_FIELD_ANY        = 0, /* driver can choose from none,
                      top, bottom, interlaced
                      depending on whatever it thinks
                      is approximate ... */
    V4L2_FIELD_NONE       = 1, /* this device has no fields ... */
    V4L2_FIELD_TOP        = 2, /* top field only */
    V4L2_FIELD_BOTTOM     = 3, /* bottom field only */
    V4L2_FIELD_INTERLACED = 4, /* both fields interlaced */
    V4L2_FIELD_SEQ_TB     = 5, /* both fields sequential into one
                      buffer, top-bottom order */
    V4L2_FIELD_SEQ_BT     = 6, /* same as above + bottom-top order */
    V4L2_FIELD_ALTERNATE  = 7, /* both fields alternating into
                      separate buffers */
};
#define V4L2_FIELD_HAS_TOP(field)    \
    ((field) == V4L2_FIELD_TOP     ||\
     (field) == V4L2_FIELD_INTERLACED ||\
     (field) == V4L2_FIELD_SEQ_TB    ||\
     (field) == V4L2_FIELD_SEQ_BT)
#define V4L2_FIELD_HAS_BOTTOM(field)    \
    ((field) == V4L2_FIELD_BOTTOM     ||\
     (field) == V4L2_FIELD_INTERLACED ||\
     (field) == V4L2_FIELD_SEQ_TB    ||\
     (field) == V4L2_FIELD_SEQ_BT)
#define V4L2_FIELD_HAS_BOTH(field)    \
    ((field) == V4L2_FIELD_INTERLACED ||\
     (field) == V4L2_FIELD_SEQ_TB    ||\
     (field) == V4L2_FIELD_SEQ_BT)

enum v4l2_buf_type {
    V4L2_BUF_TYPE_VIDEO_CAPTURE  = 1,
    V4L2_BUF_TYPE_VIDEO_OUTPUT   = 2,
    V4L2_BUF_TYPE_VIDEO_OVERLAY  = 3,
    V4L2_BUF_TYPE_VBI_CAPTURE    = 4,
    V4L2_BUF_TYPE_VBI_OUTPUT     = 5,
    V4L2_BUF_TYPE_PRIVATE        = 0x80,
};

enum v4l2_ctrl_type {
    V4L2_CTRL_TYPE_INTEGER         = 1,
    V4L2_CTRL_TYPE_BOOLEAN         = 2,
    V4L2_CTRL_TYPE_MENU         = 3,
    V4L2_CTRL_TYPE_BUTTON         = 4,
};

enum v4l2_tuner_type {
    V4L2_TUNER_RADIO         = 1,
    V4L2_TUNER_ANALOG_TV         = 2,
};

enum v4l2_memory {
    V4L2_MEMORY_MMAP             = 1,
    V4L2_MEMORY_USERPTR          = 2,
    V4L2_MEMORY_OVERLAY          = 3,
};

/* see also http://vektor.theorem.ca/graphics/ycbcr/ */
enum v4l2_colorspace {
    /* ITU-R 601 -- broadcast NTSC/PAL */
    V4L2_COLORSPACE_SMPTE170M     = 1,

    /* 1125-Line (US) HDTV */
    V4L2_COLORSPACE_SMPTE240M     = 2,

    /* HD and modern captures. */
    V4L2_COLORSPACE_REC709        = 3,
    
    /* broken BT878 extents (601, luma range 16-253 instead of 16-235) */
    V4L2_COLORSPACE_BT878         = 4,
    
    /* These should be useful.  Assume 601 extents. */
    V4L2_COLORSPACE_470_SYSTEM_M  = 5,
    V4L2_COLORSPACE_470_SYSTEM_BG = 6,
    
    /* I know there will be cameras that send this.  So, this is
     * unspecified chromaticities and full 0-255 on each of the
     * Y'CbCr components
     */
    V4L2_COLORSPACE_JPEG          = 7,
    
    /* For RGB colourspaces, this is probably a good start. */
    V4L2_COLORSPACE_SRGB          = 8,
};

struct v4l2_rect {
    __s32   left;
    __s32   top;
    __s32   width;
    __s32   height;
};

struct v4l2_fract {
    __u32   numerator;
    __u32   denominator;
};

/*
 *    D R I V E R   C A P A B I L I T I E S
 */
struct v4l2_capability
{
    __u8    driver[16];    /* i.e. "bttv" */
    __u8    card[32];    /* i.e. "Hauppauge WinTV" */
    __u8    bus_info[32];    /* "PCI:" + pci_dev->slot_name */
    __u32   version;        /* should use KERNEL_VERSION() */
    __u32    capabilities;    /* Device capabilities */
    __u32    reserved[4];
};

/* 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 VBI capture device */
#define V4L2_CAP_VBI_OUTPUT    0x00000020  /* Is a VBI output device */
#define V4L2_CAP_RDS_CAPTURE    0x00000100  /* RDS data capture */

#define V4L2_CAP_TUNER        0x00010000  /* Has a tuner */
#define V4L2_CAP_AUDIO        0x00020000  /* has audio support */

#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 */

/*
 *    V I D E O   I M A G E   F O R M A T
 */

struct v4l2_pix_format
{
    __u32                  width;
    __u32                 height;
    __u32                 pixelformat;
    enum v4l2_field      field;
    __u32                bytesperline;    /* for padding, zero if unused */
    __u32                   sizeimage;
        enum v4l2_colorspace    colorspace;
    __u32            priv;        /* private data, depends on pixelformat */
};

/*           Pixel format    FOURCC                  depth  Description   */
#define V4L2_PIX_FMT_RGB332  v4l2_fourcc('R','G','B','1') /*  8  RGB-3-3-2     */
#define V4L2_PIX_FMT_RGB555  v4l2_fourcc('R','G','B','O') /* 16  RGB-5-5-5     */
#define V4L2_PIX_FMT_RGB565  v4l2_fourcc('R','G','B','P') /* 16  RGB-5-6-5     */
#define V4L2_PIX_FMT_RGB555X v4l2_fourcc('R','G','B','Q') /* 16  RGB-5-5-5 BE  */
#define V4L2_PIX_FMT_RGB565X v4l2_fourcc('R','G','B','R') /* 16  RGB-5-6-5 BE  */
#define V4L2_PIX_FMT_BGR24   v4l2_fourcc('B','G','R','3') /* 24  BGR-8-8-8     */
#define V4L2_PIX_FMT_RGB24   v4l2_fourcc('R','G','B','3') /* 24  RGB-8-8-8     */
#define V4L2_PIX_FMT_BGR32   v4l2_fourcc('B','G','R','4') /* 32  BGR-8-8-8-8   */
#define V4L2_PIX_FMT_RGB32   v4l2_fourcc('R','G','B','4') /* 32  RGB-8-8-8-8   */
#define V4L2_PIX_FMT_GREY    v4l2_fourcc('G','R','E','Y') /*  8  Greyscale     */
#define V4L2_PIX_FMT_YVU410  v4l2_fourcc('Y','V','U','9') /*  9  YVU 4:1:0     */
#define V4L2_PIX_FMT_YVU420  v4l2_fourcc('Y','V','1','2') /* 12  YVU 4:2:0     */
#define V4L2_PIX_FMT_YUYV    v4l2_fourcc('Y','U','Y','V') /* 16  YUV 4:2:2     */
#define V4L2_PIX_FMT_UYVY    v4l2_fourcc('U','Y','V','Y') /* 16  YUV 4:2:2     */
#define V4L2_PIX_FMT_YUV422P v4l2_fourcc('4','2','2','P') /* 16  YVU422 planar */
#define V4L2_PIX_FMT_YUV411P v4l2_fourcc('4','1','1','P') /* 16  YVU411 planar */
#define V4L2_PIX_FMT_Y41P    v4l2_fourcc('Y','4','1','P') /* 12  YUV 4:1:1     */

/* two planes -- one Y, one Cr + Cb interleaved  */
#define V4L2_PIX_FMT_NV12    v4l2_fourcc('N','V','1','2') /* 12  Y/CbCr 4:2:0  */
#define V4L2_PIX_FMT_NV21    v4l2_fourcc('N','V','2','1') /* 12  Y/CrCb 4:2:0  */

/*  The following formats are not defined in the V4L2 specification */
#define V4L2_PIX_FMT_YUV410  v4l2_fourcc('Y','U','V','9') /*  9  YUV 4:1:0     */
#define V4L2_PIX_FMT_YUV420  v4l2_fourcc('Y','U','1','2') /* 12  YUV 4:2:0     */
#define V4L2_PIX_FMT_YYUV    v4l2_fourcc('Y','Y','U','V') /* 16  YUV 4:2:2     */
#define V4L2_PIX_FMT_HI240   v4l2_fourcc('H','I','2','4') /*  8  8-bit color   */

/* compressed formats */
#define V4L2_PIX_FMT_MJPEG    v4l2_fourcc('M','J','P','G') /* Motion-JPEG   */
#define V4L2_PIX_FMT_JPEG     v4l2_fourcc('J','P','E','G') /* JFIF JPEG     */
#define V4L2_PIX_FMT_DV       v4l2_fourcc('d','v','s','d') /* 1394          */
#define V4L2_PIX_FMT_MPEG     v4l2_fourcc('M','P','E','G') /* MPEG          */

/*  Vendor-specific formats   */
#define V4L2_PIX_FMT_WNVA    v4l2_fourcc('W','N','V','A') /* Winnov hw compres */

/*
 *    F O R M A T   E N U M E R A T I O N
 */
struct v4l2_fmtdesc
{
    __u32                index;             /* Format number      */
    enum v4l2_buf_type  type;              /* buffer type        */
    __u32               flags;
    __u8                description[32];   /* Description string */
    __u32                pixelformat;       /* Format fourcc      */
    __u32                reserved[4];
};

#define V4L2_FMT_FLAG_COMPRESSED 0x0001


/*
 *    T I M E C O D E
 */
struct v4l2_timecode
{
    __u32    type;
    __u32    flags;
    __u8    frames;
    __u8    seconds;
    __u8    minutes;
    __u8    hours;
    __u8    userbits[4];
};

/*  Type  */
#define V4L2_TC_TYPE_24FPS        1
#define V4L2_TC_TYPE_25FPS        2
#define V4L2_TC_TYPE_30FPS        3
#define V4L2_TC_TYPE_50FPS        4
#define V4L2_TC_TYPE_60FPS        5

/*  Flags  */
#define V4L2_TC_FLAG_DROPFRAME        0x0001 /* "drop-frame" mode */
#define V4L2_TC_FLAG_COLORFRAME        0x0002
#define V4L2_TC_USERBITS_field        0x000C
#define V4L2_TC_USERBITS_USERDEFINED    0x0000
#define V4L2_TC_USERBITS_8BITCHARS    0x0008
/* The above is based on SMPTE timecodes */


/*
 *    C O M P R E S S I O N   P A R A M E T E R S
 */
#if 0
/* ### generic compression settings don't work, there is too much
 * ### codec-specific stuff.  Maybe reuse that for MPEG codec settings
 * ### later ... */
struct v4l2_compression
{
    __u32    quality;
    __u32    keyframerate;
    __u32    pframerate;
    __u32    reserved[5];
};
#endif

struct 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            reserved[2];
};

/*  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 */

/*
 *    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    0x0004

struct v4l2_clip
{
    struct v4l2_rect        c;
    struct v4l2_clip    *next;
};

struct v4l2_window
{
    struct v4l2_rect        w;
    enum v4l2_field      field;
    __u32            chromakey;
    struct v4l2_clip    *clips;
    __u32            clipcount;
    void            *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)