BFI - Revision history

Sembiance: samples

2025-05-14T14:53:56Z

samples

← Older revision		Revision as of 07:53, 14 May 2025
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	* Company: [[Tsunami Media]]		* Company: [[Tsunami Media]]
	* Samples: [http://samples.mplayerhq.hu/game-formats/bfi/ http://samples.mplayerhq.hu/game-formats/bfi/]		* Samples: [http://samples.mplayerhq.hu/game-formats/bfi/ http://samples.mplayerhq.hu/game-formats/bfi/]
			* Samples: {{DexvertSamples\|video/bruteForceAndIgnoranceVideo}}

	Multimedia-heavy games by Tsunami use a multimedia format with the extension .bfi. According to the README.TXT file on the game Flash Traffic: City of Angels, BFI stands for Brute Force and Ignorance. As described:		Multimedia-heavy games by Tsunami use a multimedia format with the extension .bfi. According to the README.TXT file on the game Flash Traffic: City of Angels, BFI stands for Brute Force and Ignorance. As described:

Multimedia Mike: also counts as a video codec

2008-04-18T18:19:33Z

also counts as a video codec

← Older revision		Revision as of 11:19, 18 April 2008
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	* [http://www.mobygames.com/game/dos/flash-traffic-city-of-angels Flash Traffic: City of Angels]		* [http://www.mobygames.com/game/dos/flash-traffic-city-of-angels Flash Traffic: City of Angels]

			[[Category:Video Codecs]]
	[[Category:Game Formats]]		[[Category:Game Formats]]

VAG: /* File Format */ undo: this is payload, not the chunk header!

2008-03-27T20:09:38Z

File Format: undo: this is payload, not the chunk header!

← Older revision		Revision as of 13:09, 27 March 2008
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	The media frames started at file offset specified in bytes 4-7 of the header. Each frame is packaged inside a chunk with the fourcc 'IVAS' (possibly Interleaved Video and Sound). A IVAS chunk has the following payload:		The media frames started at file offset specified in bytes 4-7 of the header. Each frame is packaged inside a chunk with the fourcc 'IVAS' (possibly Interleaved Video and Sound). A IVAS chunk has the following payload:

	bytes 0-3 ( +0) unknown (video compression type? ~~this is often 'IVAS'~~)		bytes 0-3 ( +0) unknown (video compression type?)
	bytes 4-7 ( +4) offset of the audio data (from chunk header!)		bytes 4-7 ( +4) offset of the audio data (from chunk header!)
	bytes 8-11 ( +8) unknown (always zero)		bytes 8-11 ( +8) unknown (always zero)

Multimedia Mike: /* File Format */ typical chunk signature

2008-03-23T19:29:49Z

File Format: typical chunk signature

← Older revision		Revision as of 12:29, 23 March 2008
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	The media frames started at file offset specified in bytes 4-7 of the header. Each frame is packaged inside a chunk with the fourcc 'IVAS' (possibly Interleaved Video and Sound). A IVAS chunk has the following payload:		The media frames started at file offset specified in bytes 4-7 of the header. Each frame is packaged inside a chunk with the fourcc 'IVAS' (possibly Interleaved Video and Sound). A IVAS chunk has the following payload:

	bytes 0-3 ( +0) unknown (video compression type?)		bytes 0-3 ( +0) unknown (video compression type? this is often 'IVAS')
	bytes 4-7 ( +4) offset of the audio data (from chunk header!)		bytes 4-7 ( +4) offset of the audio data (from chunk header!)
	bytes 8-11 ( +8) unknown (always zero)		bytes 8-11 ( +8) unknown (always zero)
	bytes 12-15 ( +C) offset of the video data (from chunk header!)		bytes 12-15 ( +C) offset of the video data (from chunk header!)
	bytes .. unsigned, 8-bit [[PCM]] audio data (size = offset_of_the_video - offset_of_the_audio)		bytes .. unsigned, 8-bit [[PCM]] audio data (size = offset_of_the_video - offset_of_the_audio)
	bytes .. encoded video data		bytes .. encoded video data

	== Video compression ==		== Video compression ==

Multimedia Mike: Origins of Brute Force and Ignorance

2008-03-12T06:04:58Z

Origins of Brute Force and Ignorance

← Older revision		Revision as of 23:04, 11 March 2008
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	* Samples: [http://samples.mplayerhq.hu/game-formats/bfi/ http://samples.mplayerhq.hu/game-formats/bfi/]		* Samples: [http://samples.mplayerhq.hu/game-formats/bfi/ http://samples.mplayerhq.hu/game-formats/bfi/]

	Multimedia-heavy games by Tsunami use a multimedia format with the extension .bfi. All multi-byte numbers are little endian. The general [[FourCC]] chunk format is as follows:		Multimedia-heavy games by Tsunami use a multimedia format with the extension .bfi. According to the README.TXT file on the game Flash Traffic: City of Angels, BFI stands for Brute Force and Ignorance. As described:

			<blockquote>
			'''WHAT'S A BFI?'''
			<p>
			BFI stands for 'Brute Force & Ignorance'. This is the methodology we used to convert captured video to something which could be played back in a reasonably reliable manner on a wide range of currently
			installed machines. It simply means we don't think you should _have_ to buy a brand new 100Mz PCI bus Pentium machine with a true-color, high resolution, 'turbocharged' local-bus video card just to play a
			computer game. It's just too much jargon and frankly, it makes my head hurt a bit.
			</p>
			</blockquote>

			== File Format ==

			All multi-byte numbers are little endian. The general [[FourCC]] chunk format is as follows:

	bytes 0-3 chunk type		bytes 0-3 chunk type
Line 43:		Line 56:
	Compressed stream begins with 4-byte value, representing final unpacked size of the data, then followed by compression codes.		Compressed stream begins with 4-byte value, representing final unpacked size of the data, then followed by compression codes.

	Decompression ~~algo~~:		Decompression algorithm:

	read next byte of the input		read next byte of the input

VAG: /* Video compression */ typo

2007-03-08T12:22:41Z

Video compression: typo

← Older revision		Revision as of 05:22, 8 March 2007
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	read next byte of the input		read next byte of the input
	code = top two bits of the byte		code = top two bits of the byte
	length = lower 6 ~~bytes~~ of the byte		length = lower 6 bits of the byte

	code is ...		code is ...

VAG: reveal the mystery

2007-03-08T12:21:03Z

reveal the mystery

← Older revision		Revision as of 05:21, 8 March 2007
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	bytes 8.. chunk payload		bytes 8.. chunk payload

	A BFI file begins with the following header:		A BFI file begins with the following 960 (0x3C0) bytes header:

	bytes 0-3 file signature: 'BF&I'		bytes 0-3 ( +0) file signature: 'BF&I'
	bytes 4-7 total file size		bytes 4-7 ( +4) total file size
	bytes 8-11 ~~total header size~~		bytes 8-11 ( +8) offset of the first frame in file
	bytes 12-15 frame count		bytes 12-15 ( +C) frame count
	bytes 16-43 unknown		bytes 16-19 ( +10) unknown
	bytes 44-47 video width		bytes 20-23 ( +14) largest frame chunk size
	bytes 48-51 video height		bytes 24-27 ( +18) unknown (perhaps video compression type)
	bytes 52-55 ~~framerate~~		bytes 28-31 ( +1C) framerate
	bytes 56-59 number of ~~valid~~ palette entries ~~(?)~~		bytes 32-43 ( +20) unknown
	bytes 60-827 256 RGB triplets (6-bit VGA palette values)		bytes 44-47 ( +2C) video width
	bytes 828-831 audio sample rate		bytes 48-51 ( +30) video height
	bytes 832-835 audio channels (?)		bytes 52-55 ( +34) first used palette entry index
	bytes 836-959 unknown		bytes 56-59 ( +38) number of used palette entries
			bytes 60-827 ( +3C) 256 RGB triplets (6-bit VGA palette values)
			bytes 828-831 (+33C) audio sample rate
			bytes 832-835 (+340) audio channels (?)
			bytes 836-959 (+344) unknown

	The media frames ~~follow~~ the header. Each frame is packaged inside a chunk with the fourcc 'IVAS' (possibly Interleaved Video and Sound). A IVAS chunk has the following payload:		The media frames started at file offset specified in bytes 4-7 of the header. Each frame is packaged inside a chunk with the fourcc 'IVAS' (possibly Interleaved Video and Sound). A IVAS chunk has the following payload:

	bytes 0-11 unknown		bytes 0-3 ( +0) unknown (video compression type?)
	bytes 12-15 ~~size~~ of ~~audio~~ data		bytes 4-7 ( +4) offset of the audio data (from chunk header!)
	bytes 16..n unsigned, 8-bit [[PCM]] audio data		bytes 8-11 ( +8) unknown (always zero)
	bytes n.. encoded video data		bytes 12-15 ( +C) offset of the video data (from chunk header!)
			bytes .. unsigned, 8-bit [[PCM]] audio data (size = offset_of_the_video - offset_of_the_audio)
			bytes .. encoded video data

	The ~~details~~ of the ~~video coding are presently unknown~~.		== Video compression ==

			The video always encoded as palettized, 8-bit data. Single palette used for the entrie movie. Raster compression based on mixed [[LZ]] and [[RLE]] coding.
			Compressed stream begins with 4-byte value, representing final unpacked size of the data, then followed by compression codes.

			Decompression algo:

			read next byte of the input
			code = top two bits of the byte
			length = lower 6 bytes of the byte

			code is ...
			0 : normal chain
			if length is zero, read two more bytes of the length
			copy next (length) bytes of the input to the output
			1 : back chain
			if length is zero, read one more byte of the length AND two bytes of the offset
			else, read one byte of the offset
			copy (length) dwords from (output - offset) to the output
			(note, that data may overlap, so don't use memmove() function here, just bare by-dword copying!)
			2 : skip chain
			if length is zero, read two more bytes of the length
			if length still zero, finish the decompression
			leave (length) bytes of the output unchanged from the last frame
			3 : fill chain
			if length is zero, read two more bytes of the length
			color = next two bytes of the input
			fill (length) words of the output with (color)

			repeat until stop code encountered or whole output generated

	== Games Using BFI ==		== Games Using BFI ==

Multimedia Mike: reorg games

2007-03-03T07:00:59Z

reorg games

← Older revision		Revision as of 00:00, 3 March 2007
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	* Samples: [http://samples.mplayerhq.hu/game-formats/bfi/ http://samples.mplayerhq.hu/game-formats/bfi/]		* Samples: [http://samples.mplayerhq.hu/game-formats/bfi/ http://samples.mplayerhq.hu/game-formats/bfi/]

	~~[http://www.mobygames.com/game/dos/blue~~-~~force Blue Force]~~ by Tsunami ~~is at least one game that uses~~ a multimedia format with the extension .bfi. All multi-byte numbers are little endian. The general [[FourCC]] chunk format is as follows:		Multimedia-heavy games by Tsunami use a multimedia format with the extension .bfi. All multi-byte numbers are little endian. The general [[FourCC]] chunk format is as follows:

	bytes 0-3 chunk type		bytes 0-3 chunk type
Line 33:		Line 33:

	The details of the video coding are presently unknown.		The details of the video coding are presently unknown.

			== Games Using BFI ==

			* [http://www.mobygames.com/game/dos/blue-force Blue Force]
			* [http://www.mobygames.com/game/dos/flash-traffic-city-of-angels Flash Traffic: City of Angels]

	[[Category:Game Formats]]		[[Category:Game Formats]]

Dashcloud: Update samples link

2006-08-20T00:41:31Z

Update samples link

← Older revision		Revision as of 17:41, 19 August 2006
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	* Extensions: bfi		* Extensions: bfi
	* Company: [[Tsunami Media]]		* Company: [[Tsunami Media]]
	* Samples: [http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/game-formats/bfi/ http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/game-formats/bfi/]		* Samples: [http://samples.mplayerhq.hu/game-formats/bfi/ http://samples.mplayerhq.hu/game-formats/bfi/]

	[http://www.mobygames.com/game/dos/blue-force Blue Force] by Tsunami is at least one game that uses a multimedia format with the extension .bfi. All multi-byte numbers are little endian. The general [[FourCC]] chunk format is as follows:		[http://www.mobygames.com/game/dos/blue-force Blue Force] by Tsunami is at least one game that uses a multimedia format with the extension .bfi. All multi-byte numbers are little endian. The general [[FourCC]] chunk format is as follows:

Multimedia Mike: modify company name

2006-06-03T21:59:31Z

modify company name

← Older revision		Revision as of 14:59, 3 June 2006
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	* Extensions: bfi		* Extensions: bfi
	* Company: [[Tsunami]]		* Company: [[Tsunami Media]]
	* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/bfi/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/bfi/]		* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/bfi/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/bfi/]