Apple Intermediate Codec - Revision history

Kostya: /* Chroma extension scan */

2013-05-24T05:25:51Z

Chroma extension scan

← Older revision		Revision as of 22:25, 23 May 2013
Line 170:		Line 170:

	[[Category:Video Codecs]]		[[Category:Video Codecs]]
			[[Category:Intermediate Video Codecs]]

Kostya at 18:24, 17 May 2013

2013-05-17T18:24:30Z

Show changes

Ce: /* Band coding */

2013-05-17T13:07:43Z

Band coding

← Older revision		Revision as of 06:07, 17 May 2013
Line 70:		Line 70:

	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	~~[[Category:Undiscovered Video Codecs]]~~
	~~[[Category:Formats missing in MPlayer]]~~

Kostya: /* Band coding */ Updated a bit

2009-12-02T09:43:15Z

Band coding: Updated a bit

← Older revision		Revision as of 02:43, 2 December 2009
Line 40:		Line 40:
	* Rice code - unary prefix and <code>N</code> bits of residue.		* Rice code - unary prefix and <code>N</code> bits of residue.
	* code2 - signed codes with unary prefix: <code>k = get_unary(); value = get_bits(k*2) - (1 << N); </code>		* code2 - signed codes with unary prefix: <code>k = get_unary(); value = get_bits(k*2) - (1 << N); </code>
	* code3 - two unary prefixes '''TODO'''

	First 5 bits re used to select coding method:		First 5 bits re used to select coding method:

	A = 1 bit		A = 1 bit
	B = 1 bit		B = 1 bit (looks like when it's zero, Rice code is used for reading pixel, when it's set - code2 is used)
	C = 3 bits (number of bits in code residue)		C = 3 bits (number of bits in code residue)

	if <code>A = 0, B = 0</code> then it's simple Rice codes with parameter <code>C</code>		if <code>A = 0, B = 0</code> then it's simple Rice codes with parameter <code>C</code>
	if <code>A = 0, B = 1</code> then it's simple code2 with parameter <code>C</code>		if <code>A = 0, B = 1</code> then it's simple code2 with parameter <code>C</code>
	otherwise, ~~there are a lot~~ of ~~cases using a lot of similar techniques~~ (~~Rice~~, ~~code2~~, ~~code3~~, ~~zero-fill some data~~) '''TODO'''		otherwise, read two additional variables

			D = 1 bit (if zero, use simple skip/pixel scheme, if set - use something more complicated)
			E = 3 bits (number of bits in skip residue)

			if <code>A = 1, B = 0, D = 0</code> then zero all line before decoding and then apply this simple scheme:

			x = 0;
			do{
			t = get_rice(E);
			x += t;
			if (x < width)
			pixels[x++] = get_rice(C);
			}while(x < width);

			if <code>A = 1, B = 1, D = 0</code> then scheme is almost the same, but with <code>pixels[x] = get_code2(C);</code>

			'''TODO'''


	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	[[Category:Formats missing in MPlayer]]		[[Category:Formats missing in MPlayer]]

Kostya: band coding is still undiscovered

2009-11-22T17:59:50Z

band coding is still undiscovered

@@ Line 30: / Line 30: @@
 Each tile has data coded as 4 bands (probably in YYUV order) and DCT is employed.
-Each band looks like it's coded with Golomb codes (possibly as delta values, there are about 4 very similar coding modes for that too).
+==== Band coding ====
 [[Category:Video Codecs]]
 [[Category:Undiscovered Video Codecs]]
 [[Category:Formats missing in MPlayer]]

Kostya at 10:27, 28 October 2009

2009-10-28T10:27:35Z

← Older revision		Revision as of 03:27, 28 October 2009
Line 30:		Line 30:

	Each tile has data coded as 4 bands (probably in YYUV order) and DCT is employed.		Each tile has data coded as 4 bands (probably in YYUV order) and DCT is employed.

			Each band looks like it's coded with Golomb codes (possibly as delta values, there are about 4 very similar coding modes for that too).

	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	[[Category:Formats missing in MPlayer]]		[[Category:Formats missing in MPlayer]]

Kostya: Even while codec is undiscovered that should not stop us from writing some information about it.

2009-10-26T08:15:52Z

Even while codec is undiscovered that should not stop us from writing some information about it.

@@ Line 11: / Line 11: @@
 * 4:2:0 color
 * 8-bits per sample
 [[Category:Video Codecs]]
 [[Category:Undiscovered Video Codecs]]
 [[Category:Formats missing in MPlayer]]

DonDiego: All undiscovered codecs are missing in FFmpeg.

2009-08-12T21:16:36Z

All undiscovered codecs are missing in FFmpeg.

← Older revision		Revision as of 14:16, 12 August 2009
Line 15:		Line 15:
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	[[Category:Formats missing in MPlayer]]		[[Category:Formats missing in MPlayer]]
	~~[[Category:Formats missing in FFmpeg]]~~

Compn at 14:00, 8 March 2009

2009-03-08T14:00:10Z

← Older revision		Revision as of 07:00, 8 March 2009
Line 15:		Line 15:
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	[[Category:Formats missing in MPlayer]]		[[Category:Formats missing in MPlayer]]
			[[Category:Formats missing in FFmpeg]]

AConverse: more details

2009-03-02T21:39:20Z

more details

← Older revision		Revision as of 14:39, 2 March 2009
Line 3:		Line 3:
	* Samples: http://samples.mplayerhq.hu/V-codecs/icod/		* Samples: http://samples.mplayerhq.hu/V-codecs/icod/
	* Decoder: http://www.apple.com/support/downloads/appleintermediatecodec101.html		* Decoder: http://www.apple.com/support/downloads/appleintermediatecodec101.html
			* Description: http://support.apple.com/kb/HT2704

	Lossy codec used in Final Cut Express HD and iLife ’05		Lossy codec used in Final Cut Express HD and iLife ’05

			Apple Lists its Features as:
			* Intra Only
			* 4:2:0 color
			* 8-bits per sample

	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	[[Category:Formats missing in MPlayer]]		[[Category:Formats missing in MPlayer]]