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BKTR(4) Device Drivers Manual BKTR(4)

bktr — Brooktree Bt848/849/878/879 PCI TV tuners and video capture boards

bktr* at pci?
radio* at bktr?


#include <dev/ic/bt8xx.h>


option BKTR_ALLOC_PAGES=nnn
option BKTR_SYSTEM_DEFAULT=XXX
option BKTR_OVERRIDE_CARD=nnn
option BKTR_OVERRIDE_MSP=n
option BKTR_OVERRIDE_TUNER=nnn

The bktr driver provides support for PCI video capture and VBI capture on low cost, high performance boards. This should support most video cards based on the Brooktree Bt848/849/878/879 Video Capture Chip. The driver also supports FM Radio if the Tuner supports it.

Specifically, the following cards are known to work:

Animation Technologies FlyVideo
AOpen VA1000
Askey/Dynalink Magic TView
ATI TV-Wonder and Wonder/VE
AverMedia cards
Hauppauge Wincast TV and WinTV/PCI
IMS TV Turbo
Intel Smart Video Recorder III
I/O DATA GV-BCTV2/PCI
I/O DATA GV-BCTV3/PCI
KISS TV/FM PCI
Leadtek Winfast TV 2000
Leadtek Winfast TV 2000 XP
Miro PC TV
MMAC Osprey
NEC PK-UG-X017
STB TV PCI Television Tuner
Terratec TerraTVplus
Video Highway XTreme
VideoLogic Captivator PCI
Zoltrix TV and Genie TV/FM

The driver currently supports the following features:

PCI to PCI DMA transfer
clipping
yuv
rgb16
rgb24
rgb32

On these cards, tuners and other components are interconnected with an I2C bus. The Brooktree848 chips act as a master device on the bus to control them.

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

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

NTSC
PAL
SECAM
hardware default
unsigned long *
This command retrieves the current video format to the unsigned long * argument.
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:

16-bit RGB
24-bit RGB in 32 bits
16-bit 4:2:2 YUV
16-bit 4:2:2 YUV
unsigned UV
 
 
 

The following are supported field capture modes:

only odd fields
only even fields

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

struct meteor_pixfmt *
This command is used iteratively 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.

int *
This command sets the active pixel format. The int * argument is the index of the pixel format as returned by METEORGSUPPIXFMT.
int *
This command fetches the active pixel format index into the int * argument.
unsigned long *
This command sets the input port of the Brooktree848 device. The following are supported input ports:

composite (RCA)
tuner
composite S-video
mystery device
rgb meteor
S-Video

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

unsigned long *
This command retrieves the current input port to the unsigned long * argument.
unsigned short *
This command sets the number of frames to grab each second. Valid frame rates are integers from 0 to 30.
unsigned short *
This command fetches the number of frames to grab each second into the unsigned short * argument.
int *
This command controls capturing of video data. The following are valid arguments:

capture one frame
continuously capture
stop continuous capture
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:

signal every frame
signal every field

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

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

unsigned int *
This command sets the tuner's TV channel set, also sometimes called the TV channel band. This setting is used to calculate the proper tuning frequencies. The desired channel set must be selected before attempting to set the tuner channel or frequency. The following is a list of valid channel sets:

North America broadcast
North America IRC cable
North America HRC cable
Western Europe
Japan broadcast
Japan cable
Russia
Australia
France
unsigned int *
This command fetches the tuner's current channel set to the unsigned int * argument.
unsigned int *
This command sets the tuner's frequency to a specified channel in the current channel set.
unsigned int *
This command fetches the last selected channel. Note that it is not necessarily the current channel. In particular, changing the tuner's frequency by a command other than TVTUNER_SETCHNL will not update this setting, and it defaults to 0 on driver initialization.
unsigned int *
This command sets the tuner's frequency to 1/16th the value of the unsigned int * argument, in MHz. Note that the current channelset is used to determine frequency offsets when this command is executed.
unsigned int *
This command fetches the tuner's current frequency to the unsigned int * argument. Note that this value is 16 times the actual tuner frequency, in MHz.
int *
This command controls the audio input port and mute state. The following is a list of valid arguments:

tuner audio port
external audio port
internal audio port
mute audio
unmute audio
int *
This command fetches the audio input and mute state bits to the int * argument.

The following kernel configuration options are available:

option BKTR_ALLOC_PAGES=nnn
Specifies the number of contiguous pages to allocate when successfully probed. The default number of pages allocated by the kernel is 216. This means that there are (216*4096) bytes available for use.
option BKTR_SYSTEM_DEFAULT="(BROOKTREE_PAL | BROOKTREE_NTSC)"
One of these options can be used to set the default video format for the driver. This fixed random hangs and lockups with the VideoLogic Captivator PCI card.
option BKTR_OVERRIDE_CARD=nnn
Select a specific card (overrides autodetection). `nnn' is set to one of the names listed and explained below.

CARD_ASKEY_DYNALINK_MAGIC_TVIEW
Askey/Dynalink Magic TView
CARD_AVER_MEDIA
AverMedia
CARD_FLYVIDEO
Animation Technologies FlyVideo
CARD_AOPEN_VA1000
AOpen VA1000
CARD_TVWONDER
ATI TV-Wonder/VE
CARD_HAUPPAUGE
Hauppauge Wincast TV and WinTV
CARD_IMS_TURBO
IMS TV Turbo
CARD_INTEL
Intel Smart Video Recorder III
CARD_IO_GV
I/O DATA GV-BCTV2/PCI
CARD_IO_BCTV3
I/O DATA GV-BCTV3/PCI
CARD_KISS
KISS TV/FM PCI
CARD_LEADTEK
Leadtek Winfast TV 2000
CARD_LEADTEK_XP
Leadtek Winfast TV 2000 XP
CARD_MIRO
Miro PC TV
CARD_OSPREY
MMAC Osprey
CARD_NEC_PK
NEC PK-UG-X017
CARD_STB
STB TV PCI Television Tuner
CARD_TERRATVPLUS
Terratec TerraTVplus
CARD_VIDEO_HIGHWAY_XTREME
Video Highway XTreme
CARD_ZOLTRIX
Zoltrix TV
CARD_ZOLTRIX_GENIE_FM
Zoltrix Genie TV/FM
option BKTR_OVERRIDE_MSP=n
Specifies whether the MSP3400C chip is present (overrides autodetection).
option BKTR_OVERRIDE_TUNER=nnn
Select a specific tuner (overrides autodetection). `nnn' is set to one of the names listed and explained below.

TEMIC_NTSC
Temic 4032FY5
TEMIC_PAL
Temic 4002FH5
TEMIC_SECAM
Temic 4002FN5
PHILIPS_NTSC
Philips FI1236
PHILIPS_PAL
Philips FM1216
PHILIPS_SECAM
Philips FI1216MF
TEMIC_PALI
Temic 4062FY5
PHILIPS_PALI
Philips FI1246
PHILIPS_FR1236_NTSC
Philips FR1236 MK2
PHILIPS_FR1216_PAL
Philips FM1216
PHILIPS_FR1236_SECAM
Philips FM1216MF
ALPS_TSCH5
Alps TSCH5 NTSC
ALPS_TSBH1
Alps TSBH1 NTSC
TIVISION_TVF5533
Tivision TVF5533-MF NTSC

intro(4), pci(4), radio(4)

The bktr driver first appeared in FreeBSD 2.2.

The bktr driver is based on the work of Jim Lowe <james@miller.cs.uwm.edu>, Mark Tinguely <tinguely@plains.nodak.edu>, Amancio Hasty <hasty@star-gate.com>, Roger Hardiman <roger@FreeBSD.org> and a bunch of other people.

On big-endian architectures it is not possible to program the card to perform proper byte swapping in 24 bit modes, therefore only 16 and 32 bit modes are supported.

September 1, 2024 OpenBSD-7.6