NAME

bktr — Brooktree 848 compatible TV card driver

SYNOPSIS

bktr* at pci? dev ? function ?
radio* at bktr?

options BKTR_OVERRIDE_CARD=n
options BKTR_OVERRIDE_TUNER=n
options BKTR_OVERRIDE_DBX=n
options BKTR_OVERRIDE_MSP=n
options BKTR_SYSTEM_DEFAULT=n
options BKTR_USE_PLL
options BKTR_GPIO_ACCESS
options BKTR_NO_MSP_RESET

DESCRIPTION

This driver supports video capture (frame grabber) and TV tuner cards based on the Brooktree Bt848, Bt848A, Bt849A, Bt878, and Bt879 chips.

Note that bktr is not part of the dtv(4) framework.

Supported cards include most cards by AVerMedia, Hauppauge, Leadtek, Miro, Pinnacle, Pixelview, Terratec, and some other companies, especially all cards based on the Brooktree Bt848, Bt848A, Bt849A, Bt878, or Bt879 chips. A notable exception are the ATI All-in-Wonder cards.

The following kernel configuration options are available:

options BKTR_OVERRIDE_CARD=n

If the card is not recognized correctly by the auto-detection routine, it can be overridden by setting this option to the appropriate value. The following values are allowed:

options BKTR_OVERRIDE_TUNER=n

If the TV tuner is not recognized correctly by the auto-detection routine, it can be overridden by setting this option to the appropriate value. Known values are:

options BKTR_OVERRIDE_DBX=n

To override detection of the BTSC (dbx) chip, set this to 1 if you have one, or 0 if not.

options BKTR_OVERRIDE_MSP=n

To override detection of the MSP 34xx chip, set this to 1 if you have one, or 0 if not.

options BKTR_SYSTEM_DEFAULT=n

If this option is set to BROOKTREE_PAL default to PAL, else to NTSC.

options BKTR_USE_PLL

Default to PLL instead of XTAL.

options BKTR_GPIO_ACCESS

Use ioctl()s for direct GPIO access.

options BKTR_NO_MSP_RESET

Skip the MSP reset. This option is handy if you initialize the MSP audio in another operating system first and then do a soft reboot.

VIDEO CAPTURE INTERFACE

The video capture interface to bktr is accessed through the /dev/bktrN devices. The following ioctl(2) commands are supported on the Brooktree848 video capture interface:

METEORSFMT unsigned long *

This command sets the video format, also sometimes referred to as the video norm. The supported formats are:

METEORGFMT unsigned long *

This command retrieves the current video format to the unsigned long * argument.

METEORSETGEO struct meteor_geomet *

This command sets the video properties that affect the bit size of a frame through the meteor_geomet * argument.

struct meteor_geomet { 
	u_short		rows;	 /* height in pixels*/ 
	u_short		columns; /* width in pixels */ 
	u_short		frames; 
	u_long		oformat; 
}

The frames field is the number of frames to buffer. Currently only 1 frame is supported for most operations.

The oformat field is a bit-field describing the output pixel format type and which video fields to capture. The following are supported pixel format types:
.Pp

The following are supported field capture modes:

By default, frames will consist of both the odd and even fields.

METEORGSUPPIXFMT struct meteor_pixfmt *

This command is used interactively to fetch descriptions of supported output pixel formats into the meteor_pixfmt * argument.

struct meteor_pixfmt { 
	u_int          index; 
	METEOR_PIXTYPE type; 
	u_int          Bpp;		/* bytes per pixel */ 
	u_long         masks[3];	/* YUV bit masks */ 
	unsigned       swap_bytes :1; 
	unsigned       swap_shorts:1; 
};

To query all the supported formats, start with an index field of 0 and continue with successive encodings (1, 2, ...) until the command returns an error.

METEORSACTPIXFMT int *

This command sets the active pixel format. The int * argument is the index of the pixel format as returned by METEORGSUPPIXFMT.

METEORGACTPIXFMT int *

This command fetches the active pixel format index into the int * argument.

METEORSINPUT unsigned long *

This command sets the input port of the Brooktree848 device. The following are supported input ports:

Not all devices built with Brooktree848 chips support the full list of input ports.

METEORGINPUT unsigned long *

This command retrieves the current input port to the unsigned long * argument.

METEORSFPS unsigned short *

This command sets the number of frames to grab each second. Valid frame rates are integers from 0 to 30.

METEORGFPS unsigned short *

This command fetches the number of frames to grab each second into the unsigned short * argument.

METEORCAPTUR int *

This command controls capturing of video data. The following are valid arguments:

METEORSSIGNAL unsigned int *

This command controls the signal emission properties of bktr. If the unsigned int * argument is a valid signal, then that signal will be emitted when either a frame or field capture has completed. To select between frame or field signalling, the following arguments are used:

By default, signals will be generated for every frame. Generation of signals is terminated with the METEOR_SIG_MODE_MASK argument.

TUNER INTERFACE

Most cards supported by this driver feature a hardware television tuner on the I2C bus. The tuner interface to bktr is accessed through the /dev/tunerN devices. The following ioctl(2) commands are supported on the tuner interface:

FILES

HISTORY

The bktr driver appeared in FreeBSD 2.2 and NetBSD 1.5.

AUTHORS

The bktr driver was originally written by Amancio Hasty for FreeBSD and is now maintained by Roger Hardiman. NetBSD porting was done by Bernd Ernesti, Berndt Josef Wulf, Matthias Scheler, and Thomas Klausner.