RealAudio cook - Revision history

Kostya: /* Channel data */

2012-07-11T13:52:50Z

Channel data

@@ Line 96: / Line 96: @@
 ==== Channel data ====
-This one should be really close to G.722
+Channel data format is close to G.722.1 but bitstream format still differs (different field sizes, probably different VLCs).
 [[Category:Audio Codecs]]
 [[Category: MDCT Audio Codecs]]
 [[Category: Multichannel Audio Codecs]]

2012-07-11T11:24:44Z

Frame organisation

@@ Line 59: / Line 59: @@
 In case of multichannel audio frame data may consist of several subpackets (for 5.1 it's usually 4 subpackets). In this case sizes in 16-bit words for subpackets 1-N are stored as bytes at the end of frame data.
-Subpacket data is XORed with <code>0x37 0xC5 0x11 0xF2</code>. If it codes stereo data then each half of it is XORed with that key.
+Subpacket data is XORed with <code>0x37 0xC5 0x11 0xF2</code>. If it codes dual mono data then each half of it is XORed with that key.
 [[Category:Audio Codecs]]
 [[Category: MDCT Audio Codecs]]
 [[Category: Multichannel Audio Codecs]]

2012-07-11T10:54:32Z

Frame organisation

← Older revision		Revision as of 03:54, 11 July 2012
Line 59:		Line 59:
	In case of multichannel audio frame data may consist of several subpackets (for 5.1 it's usually 4 subpackets). In this case sizes in 16-bit words for subpackets 1-N are stored as bytes at the end of frame data.		In case of multichannel audio frame data may consist of several subpackets (for 5.1 it's usually 4 subpackets). In this case sizes in 16-bit words for subpackets 1-N are stored as bytes at the end of frame data.

	Subpacket data is XORed with <code>0x37 0xC5 0x11 0xF2</code>.		Subpacket data is XORed with <code>0x37 0xC5 0x11 0xF2</code>. If it codes stereo data then each half of it is XORed with that key.

2012-07-11T10:52:48Z

Type Specific Data

← Older revision		Revision as of 03:52, 11 July 2012
Line 54:		Line 54:
	for multichannel data there may be additional four bytes:		for multichannel data there may be additional four bytes:
	bytes 16-19 channel mask		bytes 16-19 channel mask

			== Frame organisation ==

			In case of multichannel audio frame data may consist of several subpackets (for 5.1 it's usually 4 subpackets). In this case sizes in 16-bit words for subpackets 1-N are stored as bytes at the end of frame data.

			Subpacket data is XORed with <code>0x37 0xC5 0x11 0xF2</code>.


	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category: MDCT Audio Codecs]]		[[Category: MDCT Audio Codecs]]
	[[Category: Multichannel Audio Codecs]]		[[Category: Multichannel Audio Codecs]]

2012-07-11T08:58:03Z

Type Specific Data

← Older revision		Revision as of 01:58, 11 July 2012
Line 52:		Line 52:
	bytes 12-13 joint stereo subband start		bytes 12-13 joint stereo subband start
	bytes 14-15 joint stereo VLC bits		bytes 14-15 joint stereo VLC bits
			for multichannel data there may be additional four bytes:
			bytes 16-19 channel mask

	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category: MDCT Audio Codecs]]		[[Category: MDCT Audio Codecs]]
	[[Category: Multichannel Audio Codecs]]		[[Category: Multichannel Audio Codecs]]

2009-04-25T10:53:16Z

Cook is now complete.

← Older revision		Revision as of 03:53, 25 April 2009
Line 3:		Line 3:
	* Samples: http://samples.mplayerhq.hu/real/AC-cook/		* Samples: http://samples.mplayerhq.hu/real/AC-cook/

	RealAudio cook (a.k.a. Cooker a.k.a. gecko) is an audio codec created by [[Real]]. It features different coding modes~~, of which cook 5.1 is not yet supported by the decoder in [[FFmpeg]]~~.		RealAudio cook (a.k.a. Cooker a.k.a. gecko) is an audio codec created by [[Real]]. It features different coding modes.

	Cook Flavors		Cook Flavors
Line 54:		Line 54:

	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	~~[[Category:Incomplete Audio Codecs]]~~
	[[Category: MDCT Audio Codecs]]		[[Category: MDCT Audio Codecs]]
	[[Category: Multichannel Audio Codecs]]		[[Category: Multichannel Audio Codecs]]

2008-01-17T14:06:30Z

← Older revision		Revision as of 07:06, 17 January 2008
Line 56:		Line 56:
	[[Category:Incomplete Audio Codecs]]		[[Category:Incomplete Audio Codecs]]
	[[Category: MDCT Audio Codecs]]		[[Category: MDCT Audio Codecs]]
			[[Category: Multichannel Audio Codecs]]

2006-12-27T16:52:47Z

← Older revision		Revision as of 09:52, 27 December 2006
Line 55:		Line 55:
	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Incomplete Audio Codecs]]		[[Category:Incomplete Audio Codecs]]
			[[Category: MDCT Audio Codecs]]

2006-12-14T06:13:13Z

← Older revision		Revision as of 23:13, 13 December 2006
Line 4:		Line 4:

	RealAudio cook (a.k.a. Cooker a.k.a. gecko) is an audio codec created by [[Real]]. It features different coding modes, of which cook 5.1 is not yet supported by the decoder in [[FFmpeg]].		RealAudio cook (a.k.a. Cooker a.k.a. gecko) is an audio codec created by [[Real]]. It features different coding modes, of which cook 5.1 is not yet supported by the decoder in [[FFmpeg]].


	Cook Flavors		Cook Flavors
Line 41:		Line 40:
	32 184 Kbps 5.1 Multichannel - RealAudio 10		32 184 Kbps 5.1 Multichannel - RealAudio 10
	33 268 Kbps 5.1 Multichannel - RealAudio 10		33 268 Kbps 5.1 Multichannel - RealAudio 10

			== Type Specific Data ==
			Cook data is encapsulated in [[RealMedia]] files which transport type specific data needed by different codecs. Cook requires 8 bytes of type specific data for monophonic audio and 16 bytes for stereo data. Multi-byte numbers are big-endian:

			mono and stereo data:
			bytes 0-3 Cook version
			bytes 4-5 samples per frame per channel
			bytes 6-7 number of subbands used in the frequency domain
			stereo data requires 8 more bytes:
			bytes 8-11 unused
			bytes 12-13 joint stereo subband start
			bytes 14-15 joint stereo VLC bits

	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Incomplete Audio Codecs]]		[[Category:Incomplete Audio Codecs]]

2006-08-18T03:45:41Z

Update samples link

← Older revision		Revision as of 20:45, 17 August 2006
Line 1:		Line 1:
	* FourCC: cook		* FourCC: cook
	* Company: [[Real]]		* Company: [[Real]]
	* Samples: http://samples.mplayerhq.hu~~/samples~~/real/AC-cook/		* Samples: http://samples.mplayerhq.hu/real/AC-cook/

	RealAudio cook (a.k.a. Cooker a.k.a. gecko) is an audio codec created by [[Real]]. It features different coding modes, of which cook 5.1 is not yet supported by the decoder in [[FFmpeg]].		RealAudio cook (a.k.a. Cooker a.k.a. gecko) is an audio codec created by [[Real]]. It features different coding modes, of which cook 5.1 is not yet supported by the decoder in [[FFmpeg]].