Apple Pixlet Codec - Revision history

Pbm: This codec have been fully reverse engineered

2017-01-06T15:30:57Z

This codec have been fully reverse engineered

← Older revision		Revision as of 08:30, 6 January 2017
Line 2:		Line 2:
	* Samples: [http://samples.mplayerhq.hu/V-codecs/pxlt-ApplePixlet/ http://samples.mplayerhq.hu/V-codecs/pxlt-ApplePixlet/]		* Samples: [http://samples.mplayerhq.hu/V-codecs/pxlt-ApplePixlet/ http://samples.mplayerhq.hu/V-codecs/pxlt-ApplePixlet/]

	Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. No open source decoder. This codec was designed as an editing format and is rarely used for media distribution.		Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. FFmpeg have open source decoder. This codec was designed as an editing format and is rarely used for media distribution.

	=== Frame Format ===		=== Frame Format ===
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	[[Category:Wavelet Video Codecs]]		[[Category:Wavelet Video Codecs]]
	[[Category:Video Codecs]]		[[Category:Video Codecs]]
	~~[[Category:Undiscovered Video Codecs]]~~
	[[Category:Formats missing in MPlayer]]		[[Category:Formats missing in MPlayer]]

Kostya: /* Highpass subbands coding */

2016-05-14T09:54:24Z

Highpass subbands coding

← Older revision		Revision as of 02:54, 14 May 2016
Line 86:		Line 86:
	4- 7 -- some positive value		4- 7 -- some positive value
	8-11 -- some parameter		8-11 -- some parameter
	12-15 -- ~~quantiser~~		12-15 -- some parameter 2
	16-19 -- 0xDEADBEEF		16-19 -- 0xDEADBEEF

			Coefficients decoding is done similarly to the lowpass subband decoding except that some parameters are taken from the subband header.

	=== Wavelet filters ===		=== Wavelet filters ===

Kostya: /* Lowpass subband coding */

2016-05-14T09:50:35Z

Lowpass subband coding

← Older revision		Revision as of 02:50, 14 May 2016
Line 60:		Line 60:
	rparam += quant * (val - (rparam >> 8));		rparam += quant * (val - (rparam >> 8));
	flag = 0;		flag = 0;

	if (rparam * 4 > 0xFF && dst < dst_end) {		if (rparam * 4 > 0xFF && dst < dst_end) {
	nbits = log2(rparam) + ((rparam + 8) >> 5) - 24;		nbits = log2(rparam) + ((rparam + 8) >> 5) - 24;

Kostya: /* Lowpass subband coding */

2016-05-14T09:50:21Z

Lowpass subband coding

← Older revision		Revision as of 02:50, 14 May 2016
Line 28:		Line 28:
	Decoding order:		Decoding order:
	* top left pixel (as 16-bit BE, no special coding)		* top left pixel (as 16-bit BE, no special coding)
	* ~~top~~ row (without the first pixel)		* top row (without the first pixel)
	* left column (without the first pixel)		* left column (without the first pixel)
	* the rest of pixels		* the rest of pixels

	~~Coding parameters~~:		After decoding pixel data is top+left predicted, i.e. <code>dst[x][y] += dst[x-1][y] + dst[x][y-1];</code>
	* 3
	* 3		Coefficients are decoded as adaptive Rice codes in form of <code>val, [skip]</code>:
	* quant = 120
	* ~~max length~~ = 14		flag = 0;
	* ~~16383~~		rparam = 3;
	* ~~136~~		quant = 120;
	* ~~255~~		max_length = 14;
			max_zlength =
			while (!done) {
			nbits = log2((rparam >> 8) + 3);
			if (nbits > max_length)
			nbits = max_length;
			if (show_bits(8) == 0xFF) {
			skip_bits(8);
			val = get_bits(16);
			} else {
			pfx = show_unary(); // like 111110 -> 5
			val = ((1 << nbits) - 1) * pfx + get_bits(nbits) - 1;
			}
			val += flag;
			if (val & 1)
			*dst++ = -((val + 1) >> 1);
			else
			*dst++ = (val + 1) >> 1;

			rparam += quant * (val - (rparam >> 8));
			flag = 0;

	~~After decoding pixel data is top+left predicted, i.e. <code~~>dst~~[x][y]~~ += ~~dst[x~~-1~~][y]~~ + ~~dst[x][y~~-1];<~~/code>~~		if (rparam * 4 > 0xFF && dst < dst_end) {
			nbits = log2(rparam) + ((rparam + 8) >> 5) - 24;
			if (nbits > max_zlength)
			nbits = max_zlength;
			if (show_bits(8) == 0xFF) {
			skip_bits(8);
			val = get_bits(16);
			} else {
			pfx = show_unary(); // like 111110 -> 5
			val = ((1 << nbits) - 1) * pfx + get_bits(nbits) - 1;
			}
			rparam = 0;
			if (val <= 0xFFFE)
			flag = 1;
			dst += val;
			}
			}

	==== Highpass subbands coding ====		==== Highpass subbands coding ====

Kostya: some description

2016-05-14T09:17:33Z

some description

← Older revision		Revision as of 02:17, 14 May 2016
Line 3:		Line 3:

	Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. No open source decoder. This codec was designed as an editing format and is rarely used for media distribution.		Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. No open source decoder. This codec was designed as an editing format and is rarely used for media distribution.

			=== Frame Format ===

			==== Frame Header ====

			All values are 32-bit big-endian words.

			0- 3 -- frame size
			4- 7 -- version, supposed to be 1
			8-11 -- ???
			12-15 -- should be 0x01000000
			16-19 -- ???
			20-23 -- width
			24-27 -- height
			28-31 -- number of levels (should be 4)
			32-35 -- ???
			36-39 -- some number * 1000
			40-43 -- coded planes size?

			Each plane starts with (level2) words that contain scaling parameters used in wavelet reconstruction (horizontal/vertical) multiplied by 1000000 followed by lowpass subband and (level3) highpass subbands.

			==== Lowpass subband coding ====

			Decoding order:
			* top left pixel (as 16-bit BE, no special coding)
			* top row (without the first pixel)
			* left column (without the first pixel)
			* the rest of pixels

			Coding parameters:
			* 3
			* 3
			* quant = 120
			* max length = 14
			* 16383
			* 136
			* 255

			After decoding pixel data is top+left predicted, i.e. <code>dst[x][y] += dst[x-1][y] + dst[x][y-1];</code>

			==== Highpass subbands coding ====

			Header:

			0- 3 -- some negative value
			4- 7 -- some positive value
			8-11 -- some parameter
			12-15 -- quantiser
			16-19 -- 0xDEADBEEF

			=== Wavelet filters ===

			Edges:

			-0.07576144003329376
			0.8586296626673486
			-0.07576144003329376

			0.3535533905932737
			0.3535533905932737

			Main:

			-0.01515228715813062
			0.3687056777514043
			0.3687056777514043
			-0.01515228715813062

			0.07071067811865475
			-0.8485281374238569
			0.07071067811865475

	[[Category:Wavelet Video Codecs]]		[[Category:Wavelet Video Codecs]]

Compn at 14:00, 8 March 2009

2009-03-08T14:00:42Z

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

Multimedia Mike: suspected wavelet codec

2007-10-31T20:02:13Z

suspected wavelet codec

← Older revision		Revision as of 13:02, 31 October 2007
Line 4:		Line 4:
	Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. No open source decoder. This codec was designed as an editing format and is rarely used for media distribution.		Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. No open source decoder. This codec was designed as an editing format and is rarely used for media distribution.

			[[Category:Wavelet Video Codecs]]
			[[Category:Video Codecs]]
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	~~[[Category:Video Codecs]]~~

Dashcloud: Update samples link

2006-08-17T21:05:52Z

Update samples link

← Older revision		Revision as of 14:05, 17 August 2006
Line 1:		Line 1:
	* FOURCCs: PXLT		* FOURCCs: PXLT
	* Samples: [http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/V-codecs/pxlt-ApplePixlet/ http://~~www~~.mplayerhq.hu~~/MPlayer/samples~~/V-codecs/pxlt-ApplePixlet/]		* Samples: [http://samples.mplayerhq.hu/V-codecs/pxlt-ApplePixlet/ http://samples.mplayerhq.hu/V-codecs/pxlt-ApplePixlet/]

	Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. No open source decoder. This codec was designed as an editing format and is rarely used for media distribution.		Pixar/[[Apple]] Pixlet codec. Reportedly based on a wavelet transform and encodes only I-frames. No open source decoder. This codec was designed as an editing format and is rarely used for media distribution.

Multimedia Mike: revert spam/vandalism

2006-03-24T19:11:16Z

revert spam/vandalism

← Older revision		Revision as of 12:11, 24 March 2006
Line 6:		Line 6:
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	[[Category:Video Codecs]]		[[Category:Video Codecs]]








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2006-03-24T08:38:04Z

← Older revision		Revision as of 01:38, 24 March 2006
Line 6:		Line 6:
	[[Category:Undiscovered Video Codecs]]		[[Category:Undiscovered Video Codecs]]
	[[Category:Video Codecs]]		[[Category:Video Codecs]]





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