Windows Media Audio Pro - Revision history

Merbanan: /* Channel configuration */ Don't spread lies.

2009-09-24T20:49:34Z

Channel configuration: Don't spread lies.

@@ Line 49: / Line 49: @@
   SPEAKER_TOP_BACK_RIGHT         0x20000
 [[Category:Audio Codecs]]
 [[Category: Multichannel Audio Codecs]]

2009-09-03T04:47:23Z

← Older revision		Revision as of 21:47, 2 September 2009
Line 67:		Line 67:

	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	~~[[Category:Undiscovered Audio Codecs]]~~
	[[Category: Multichannel Audio Codecs]]		[[Category: Multichannel Audio Codecs]]

2008-01-17T14:05:49Z

← Older revision		Revision as of 07:05, 17 January 2008
Line 68:		Line 68:
	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Undiscovered Audio Codecs]]		[[Category:Undiscovered Audio Codecs]]
			[[Category: Multichannel Audio Codecs]]

2007-12-30T21:55:04Z

Added one more extradata dump

← Older revision		Revision as of 14:55, 30 December 2007
Line 12:		Line 12:
	byte 7-14 Not used		byte 7-14 Not used
	byte 15-16 Decoding flags, bitfield used for calculating samples per frame amongst others (int16_t)		byte 15-16 Decoding flags, bitfield used for calculating samples per frame amongst others (int16_t)
	byte 17-18 ~~Not used~~		byte 17-18 Probably some flags for low bitrate files.

	Example extradata dump of a 5.1 file:		Example extradata dump of a 5.1 file:
Line 21:		Line 21:

	[[18] [0]] [[3] [0] [0] [0]] [0] [0] [0] [0] [0] [0] [0] [0] [[e0] [0]] [0] [0]		[[18] [0]] [[3] [0] [0] [0]] [0] [0] [0] [0] [0] [0] [0] [0] [[e0] [0]] [0] [0]

			Example extradata dump of a low bitrate stereo file:

			[[10] [0]] [[3] [0] [0] [0]] [0] [0] [0] [0] [0] [0] [0] [0] [[e0] [0]] [[42] [c0]]

	== Channel configuration ==		== Channel configuration ==

2007-12-30T13:12:45Z

Minor fixes

← Older revision		Revision as of 06:12, 30 December 2007
Line 2:		Line 2:
	* Company: [[Microsoft]]		* Company: [[Microsoft]]
	* Samples: http://samples.mplayerhq.hu/A-codecs/WMA9/		* Samples: http://samples.mplayerhq.hu/A-codecs/WMA9/
			* Wikipedia info: http://en.wikipedia.org/wiki/Windows_Media_Audio#Windows_Media_Audio_Professional
	The next generation of Windows Media audio codecs.		The next generation of Windows Media audio codecs.

Line 45:		Line 45:
	SPEAKER_TOP_BACK_RIGHT 0x20000		SPEAKER_TOP_BACK_RIGHT 0x20000

	And the following configurations are valid:		And the following configurations are valid (incorrect, will fix later):

	channelmasks[8] = {		channelmasks[8] = {

2007-12-29T22:05:55Z

Corrections.

← Older revision		Revision as of 15:05, 29 December 2007
Line 8:		Line 8:
	This is a rough guess of the extra data from the asf container (little endian order).		This is a rough guess of the extra data from the asf container (little endian order).

	byte 1-2 ~~Size of extradata~~		byte 1-2 Bits per sample (wBitsPerSample) (http://msdn2.microsoft.com/en-us/library/ms791274.aspx)
	byte 3-6 Channel mask (dwChannelMask) (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)		byte 3-6 Channel mask (dwChannelMask) (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)
	byte 7-14 ~~Unknown~~		byte 7-14 Not used
	byte 15-16 ~~Mask~~ used for calculating samples per frame (int16_t)		byte 15-16 Decoding flags, bitfield used for calculating samples per frame amongst others (int16_t)
	byte 17-18 ~~Unknown~~		byte 17-18 Not used

	Example extradata dump of a 5.1 file:		Example extradata dump of a 5.1 file:

	[18] [0] [3f] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [e0] [0] [0] [0]		[[18] [0]] [[3f] [0] [0] [0]] [0] [0] [0] [0] [0] [0] [0] [0] [[e0] [0]] [0] [0]

	Example extradata dump of a stereo file:		Example extradata dump of a stereo file:

	[18] [0] [3] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [e0] [0] [0] [0]		[[18] [0]] [[3] [0] [0] [0]] [0] [0] [0] [0] [0] [0] [0] [0] [[e0] [0]] [0] [0]


	== Channel configuration ==		== Channel configuration ==

2007-12-29T12:09:30Z

Add channel configurations.

@@ Line 9: / Line 9: @@
   byte 1-2    Size of extradata
-  byte 3-6    Channel mask (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)
+  byte 3-6    Channel mask (dwChannelMask) (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)
   byte 7-14   Unknown
   byte 15-16  Mask used for calculating samples per frame (int16_t)
@@ Line 17: / Line 17: @@
   [18] [0] [3f] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [e0] [0] [0] [0]
 [[Category:Audio Codecs]]
 [[Category:Undiscovered Audio Codecs]]

2007-12-27T15:36:07Z

example

← Older revision		Revision as of 08:36, 27 December 2007
Line 13:		Line 13:
	byte 15-16 Mask used for calculating samples per frame (int16_t)		byte 15-16 Mask used for calculating samples per frame (int16_t)
	byte 17-18 Unknown		byte 17-18 Unknown

			Example extradata dump of a 5.1 file:

			[18] [0] [3f] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [0] [e0] [0] [0] [0]

	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Undiscovered Audio Codecs]]		[[Category:Undiscovered Audio Codecs]]

2007-12-27T14:31:08Z

Extra data layout

← Older revision		Revision as of 07:31, 27 December 2007
Line 8:		Line 8:
	This is a rough guess of the extra data from the asf container (little endian order).		This is a rough guess of the extra data from the asf container (little endian order).

	byte 1 Size of extradata		byte 1-2 Size of extradata
	byte 3-6 Channel mask (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)		byte 3-6 Channel mask (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)
	byte 7-14 Unknown		byte 7-14 Unknown

2007-12-27T14:30:33Z

Extra data layout

← Older revision		Revision as of 07:30, 27 December 2007
Line 9:		Line 9:

	byte 1 Size of extradata		byte 1 Size of extradata
	byte 3-4 Channel mask (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)		byte 3-6 Channel mask (http://msdn2.microsoft.com/en-us/library/ms790436.aspx)
	byte 5-14 Unknown		byte 7-14 Unknown
	byte 15-16 Mask used for calculating samples per frame		byte 15-16 Mask used for calculating samples per frame (int16_t)
	byte 17-18 Unknown		byte 17-18 Unknown

	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category:Undiscovered Audio Codecs]]		[[Category:Undiscovered Audio Codecs]]