Karl Morton's Video Codec - Revision history

Kostya: update information for the old version

2024-09-16T14:19:55Z

update information for the old version

Kostya: /* Method 4 for block 16x16 */

2011-03-15T09:04:51Z

Method 4 for block 16x16

← Older revision		Revision as of 02:04, 15 March 2011
Line 125:		Line 125:

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

Dashcloud: Update samples link

2006-08-17T22:17:14Z

Update samples link

← Older revision		Revision as of 15:17, 17 August 2006
Line 1:		Line 1:
	* FourCC: KMVC		* FourCC: KMVC
	* Samples: [http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/V-codecs/KMVC/ http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/V-codecs/KMVC/]		* Samples: [http://samples.mplayerhq.hu/V-codecs/KMVC/ http://samples.mplayerhq.hu/V-codecs/KMVC/]

	KMVC is used on various ''Worms'' PC games.		KMVC is used on various ''Worms'' PC games.

Kostya at 06:47, 23 May 2006

2006-05-23T06:47:31Z

← Older revision		Revision as of 23:47, 22 May 2006
Line 6:		Line 6:
	== Common details ==		== Common details ==
	This codec operates on 8x8 or 16x16 blocks in 256 colors mode. This codec is also employs exotic bitstream reading: actually you need to read byte and when it's exhausted, read another byte, so flags and other data are very mixed. Two versions of this codec are known: one stores palette in frame, another one also could do this but stores palette in extradata instead. Compression principle is simple: divide frame into sequence of blocks and then either fill it, copy from other position or divide onto four subblocks and do the same.		This codec operates on 8x8 or 16x16 blocks in 256 colors mode. This codec is also employs exotic bitstream reading: actually you need to read byte and when it's exhausted, read another byte, so flags and other data are very mixed. Two versions of this codec are known: one stores palette in frame, another one also could do this but stores palette in extradata instead. Compression principle is simple: divide frame into sequence of blocks and then either fill it, copy from other position or divide onto four subblocks and do the same.

			== Palette change frames ==

			Newer version of KVMC has two palette change methods - via 'xxpc' (palette change) chunk in AVI and via special frames (some files has both!).

			Frame header consists of two bytes, first one specifies palette start offset (usually 1 or 128) and the second byte is palette block size (= 127 colors). Legal frames have second byte (block size) equal to 8 (or possible 16) when this frames have 0x7F, so this is how they could be distinguished.

			Next two bytes are zeroes, and the rest of frame data is 127 palette entries packed in 4-tuples.

	== Frame structure ==		== Frame structure ==
Line 111:		Line 119:

	== Method 3 for block 16x16 ==		== Method 3 for block 16x16 ==
	~~<b>[TODO]</b>~~		Extended method 3 for 8x8 blocks. There are no known samples to test.

	== Method 4 for block 16x16 ==		== Method 4 for block 16x16 ==
	~~<b>[TODO]</b>~~		Extended method 4 for 8x8 blocks. There are no known samples to test.

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

Multimedia Mike: promote from undiscovered -> incomplete

2006-04-03T05:17:10Z

promote from undiscovered -> incomplete

← Older revision		Revision as of 22:17, 2 April 2006
Line 116:		Line 116:
	<b>[TODO]</b>		<b>[TODO]</b>

	[[Category:~~Undiscovered~~ Video Codecs]]		[[Category:Game Formats]]
			[[Category:Incomplete Video Codecs]]
	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	~~[[Category:Game Formats]]~~

Kostya: Fill all known details

2006-04-03T04:59:32Z

Fill all known details

← Older revision		Revision as of 21:59, 2 April 2006
Line 5:		Line 5:

	== Common details ==		== Common details ==
	This codec operates on 8x8 or 16x16 blocks in 256 colors mode. This codec is also employs exotic bitstream reading: actually you need to read byte and when it's exhausted, read another byte, so flags and other data are very mixed.		This codec operates on 8x8 or 16x16 blocks in 256 colors mode. This codec is also employs exotic bitstream reading: actually you need to read byte and when it's exhausted, read another byte, so flags and other data are very mixed. Two versions of this codec are known: one stores palette in frame, another one also could do this but stores palette in extradata instead. Compression principle is simple: divide frame into sequence of blocks and then either fill it, copy from other position or divide onto four subblocks and do the same.

	== Frame structure ==		== Frame structure ==

	Frame consists of the next parts: header byte, palette chunk (if needed), compressed blocks.		Frame consists of the next parts: header byte, palette chunk (if needed), block size (1 byte), compressed blocks.

	Header byte may have this bits set:		Header byte may have this bits set:
Line 16:		Line 16:
	K - is keyframe		K - is keyframe
	P - palette is present		P - palette is present
	xx - ~~unknown~~ bits		xx - unused bits
	MMMM - compression method (only methods 3 and 4 are known)		MMMM - compression method (only methods 3 and 4 are known)

	~~Details for palette chunk are still unknown~~.		Palette size is defined in byte 10 of extradata (usually 127 or rarely 255) and is standard R,G,B triplets.
	Compressed blocks are decoded with given method until frame is fully decoded.		Compressed blocks are decoded with given method until frame is fully decoded.

	== Method 3 for block 8x8 ==		== Method 3 for block 8x8 ==
	This is method used in intraframes:		This is method used in intraframes.

	if(!getbit()){		if(!getbit()){
Line 64:		Line 64:

	== Method 4 for block 8x8 ==		== Method 4 for block 8x8 ==
	<b>[~~TODO~~]~~</b>~~		This method is used for interframes and has only two differences from method 3:
			* 8x8 block can be not only filled with given value or divided into subblocks but also can be skipped;
			* motion compensation uses previous frame for reference and has motion vactor range -8..7 instead of -15..0.

			if(!getbit()){
			if(!getbit()){
			copy block from previous frame unchanged
			}else{
			val = getbyte();
			fill block 8x8 with val;
			}
			} else {
			for all subblocks 4x4 {
			if(!getbit()){
			if(!getbit()){
			val = getbyte();
			fill block 4x4 with given val;
			} else {
			val = getbyte();
			mx = (val & 0xF) - 8;
			my = (val >> 4) - 8;
			copy block 4x4 from previous frame with offset (mx, my)
			}
			} else {
			for all subblocks 2x2 (in subblock 4x4) {
			if(!getbit()){
			if(!getbit()){
			val = getbyte();
			fill block 2x2 with given val;
			} else {
			val = getbyte();
			mx = val & 0xF;
			my = val >> 4;
			copy block 2x2 from previous frame with offset (mx, my)
			}
			} else {
			block[0,0] = getbyte();
			block[0,1] = getbyte();
			block[1,0] = getbyte();
			block[1,1] = getbyte();
			}
			}
			}
			}
			}

	== Method 3 for block 16x16 ==		== Method 3 for block 16x16 ==

Kostya: Preliminary format description

2006-04-02T05:05:08Z

Preliminary format description

@@ Line 3: / Line 3: @@
 KMVC is used on various ''Worms'' PC games.
 [[Category:Undiscovered Video Codecs]]
 [[Category:Video Codecs]]
 [[Category:Game Formats]]

Multimedia Mike: revert spam/vandalism

2006-03-24T19:09:24Z

revert spam/vandalism

← Older revision		Revision as of 12:09, 24 March 2006
Line 7:		Line 7:
	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Game Formats]]		[[Category:Game Formats]]








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62.116.40.112: "

2006-03-24T08:37:53Z

← Older revision		Revision as of 01:37, 24 March 2006
Line 7:		Line 7:
	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Game Formats]]		[[Category:Game Formats]]





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220.181.28.236: "

2006-03-24T07:28:05Z

← Older revision		Revision as of 00:28, 24 March 2006
Line 7:		Line 7:
	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Game Formats]]		[[Category:Game Formats]]





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