sane-project-backends/backend/v4l-grab.h

#define VIDEO_RGB08          1  /* bt848 dithered */
#define VIDEO_GRAY           2
#define VIDEO_RGB15_LE       3  /* 15 bpp little endian */
#define VIDEO_RGB16_LE       4  /* 16 bpp little endian */
#define VIDEO_RGB15_BE       5  /* 15 bpp big endian */
#define VIDEO_RGB16_BE       6  /* 16 bpp big endian */
#define VIDEO_BGR24          7  /* bgrbgrbgrbgr (LE) */
#define VIDEO_BGR32          8  /* bgr-bgr-bgr- (LE) */
#define VIDEO_RGB24          9  /* rgbrgbrgbrgb (BE)*/
#define VIDEO_RGB32         10  /* -rgb-rgb-rgb (BE)*/
#define VIDEO_LUT2          11  /* lookup-table 2 byte depth */
#define VIDEO_LUT4          12  /* lookup-table 4 byte depth */

#define CAN_AUDIO_VOLUME     1

#define TRAP(txt) fprintf(stderr,"%s:%d:%s\n",__FILE__,__LINE__,txt);exit(1);

/* ------------------------------------------------------------------------- */

struct STRTAB {
    long nr;
    char *str;
};

struct OVERLAY_CLIP {
    int x1,x2,y1,y2;
};

struct GRABBER {
    char            *name;
    int             flags;
    struct STRTAB   *norms;
    struct STRTAB   *inputs;

    int   (*grab_open)(char *opt);
    int   (*grab_close)(void);

    int   (*grab_setupfb)(int sw, int sh, int format, void *base, int bpl);
    int   (*grab_overlay)(int x, int y, int width, int height, int format,
                          struct OVERLAY_CLIP *oc, int count);

    int   (*grab_setparams)(int format, int *width, int *height, int *linelength);
    void* (*grab_capture)(int single);
    void  (*grab_cleanup)(void);

    int   (*grab_tune)(unsigned long freq);
    int   (*grab_tuned)(void);
    int   (*grab_input)(int input, int norm);
    int   (*grab_picture)(int color, int bright, int hue, int contrast);
    int   (*grab_audio)(int mute, int volume, int *mode);
};

/* ------------------------------------------------------------------------- */

extern int debug;
extern int have_dga;

extern char *device;
extern int fd_grab;
extern struct GRABBER *grabber;

extern unsigned int format2depth[];
extern unsigned char* format_desc[];

/* ------------------------------------------------------------------------- */

int   grabber_open(int sw, int sh, void *base, int format, int width);
int   grabber_setparams(int format, int *width, int *height,
                        int *linelength, int lut_valid);
void* grabber_capture(void *dest, int dest_linelength, int single);