TechSmith Screen Capture Codec 2 - Revision history

Kostya: /* Frame format */

2012-07-07T13:31:40Z

Frame format

← Older revision		Revision as of 06:31, 7 July 2012
Line 9:		Line 9:

	0 - frame type (1- coded, 0 - skip frame)		0 - frame type (1- coded, 0 - skip frame)
	1 - ~~luma quantiser?~~		1 - quantiser1 (0-12)
	2 - ~~chroma quantiser?~~		2 - quantiser2 (0-12)
	3 - ???		3 - ???
	[macroblock properties]		[macroblock properties]
Line 18:		Line 18:

	4 bytes LE - chunk size		4 bytes LE - chunk size
	rest - RLE-coded ~~properties~~ in bytes in form (val << 6) \| (count)		rest - RLE-coded mode in bytes in form (val << 6) \| (count)

	Macroblock slices begin with slice size. If the first byte is odd, then it's the full size. Otherwise read whole 32-bit word and divide it by two in order to obtain real macroblock data size.		Macroblock slices begin with slice size. If the first byte is odd, then it's the full size. Otherwise read whole 32-bit word and divide it by two in order to obtain real macroblock data size.

			Mode meaning: 0/3 - skip block, 1 - select quantiser1, 2 - select quantiser2

	Macroblocks encode series of 4x4 DCT blocks (4x2), one component after another.		Macroblocks encode series of 4x4 DCT blocks (4x2), one component after another.
Line 50:		Line 52:
	Q2 = 4 * round(quant * 32768 * 0.1313064328597225^2 ) // about 4 * round(quant * 564.966)		Q2 = 4 * round(quant * 32768 * 0.1313064328597225^2 ) // about 4 * round(quant * 564.966)

	~~IDCT~~: (~~TODO~~)		Unquantising:

			val = (quant * (qval << 6) + 0x10000) >> 17

			IDCT matrix:

			5 5 5 2
			5 2 -5 -5
			5 -2 -5 5
			5 -5 5 -2

	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	~~[[Category:Undiscovered Video Codecs]]~~
	[[Category:Screen Capture Video Codecs]]		[[Category:Screen Capture Video Codecs]]

Kostya at 13:12, 7 July 2012

2012-07-07T13:12:43Z

@@ Line 36: / Line 36: @@
   7 11 14
 12 13 15
 IDCT: (TODO)

Kostya at 19:18, 4 July 2012

2012-07-04T19:18:40Z

@@ Line 21: / Line 21: @@
 Macroblock slices begin with slice size. If the first byte is odd, then it's the full size. Otherwise read whole 32-bit word and divide it by two in order to obtain real macroblock data size.
 [[Category:Video Codecs]]
 [[Category:Undiscovered Video Codecs]]
 [[Category:Screen Capture Video Codecs]]

Kostya at 19:12, 3 July 2012

2012-07-03T19:12:05Z

New page

* FOURCC: TSC2
* Company: [[TechSmith]]

This codec was developed by TechSmith and used in their screen capturing products.

== Frame format ==

This codec operates on 16x8 macroblocks.

0 - frame type (1- coded, 0 - skip frame)
1 - luma quantiser?
2 - chroma quantiser?
3 - ???
[macroblock properties]
[macroblock slices]

Macroblock properties:

4 bytes LE - chunk size
rest - RLE-coded properties in bytes in form (val << 6) | (count)

Macroblock slices begin with slice size. If the first byte is odd, then it's the full size. Otherwise read whole 32-bit word and divide it by two in order to obtain real macroblock data size.

[[Category:Video Codecs]]
[[Category:Undiscovered Video Codecs]]
[[Category:Screen Capture Video Codecs]]