Audible Audio - Revision history

Sembiance: samples

2025-05-14T14:46:16Z

samples

← Older revision		Revision as of 07:46, 14 May 2025
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	* Company: Audible.com		* Company: Audible.com
	* Samples: http://samples.mplayerhq.hu/audible/		* Samples: http://samples.mplayerhq.hu/audible/
			* Samples: {{DexvertSamples\|audio/audibleAudio}}

	Proprietary container format from audible.com. There is no published specification. It may contain one of five different encodings which are numbered 1 thru 5. 1-3 are rumored to be [[ACELP.net]] at varying bitrates. #4 is [[MP3]]. #5 is some unknown Sony format.		Proprietary container format from audible.com. There is no published specification. It may contain one of five different encodings which are numbered 1 thru 5. 1-3 are rumored to be [[ACELP.net]] at varying bitrates. #4 is [[MP3]]. #5 is some unknown Sony format.

2011-01-30T18:30:57Z

Mucho documentation of file format

2009-08-20T22:55:12Z

← Older revision		Revision as of 15:55, 20 August 2009
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	To find files, use Google "filetype:aa audible".		To find files, use Google "filetype:aa audible".

			Apparently this project knows everything below this: [http://code.google.com/p/pyaudibletags/source/browse/trunk/pyaudibletags.py PyAudibleTags]

	=== File format ===		=== File format ===

2009-08-20T00:16:16Z

← Older revision		Revision as of 17:16, 19 August 2009
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	Proprietary container format from audible.com. There is no published specification. It may contain one of five different encodings which are numbered 1 thru 5. 1-3 are rumored to be [[ACELP.net]] at varying bitrates. #4 is [[MP3]]. #5 is some unknown Sony format.		Proprietary container format from audible.com. There is no published specification. It may contain one of five different encodings which are numbered 1 thru 5. 1-3 are rumored to be [[ACELP.net]] at varying bitrates. #4 is [[MP3]]. #5 is some unknown Sony format.

	* [http://www.audible.com/formats Audible.com FAQ]
	* [http://www.digitalpreservation.gov/formats/fdd/fdd000103.shtml Description of the format from the US Library of Congress]		* [http://www.digitalpreservation.gov/formats/fdd/fdd000103.shtml Description of the format from the US Library of Congress]
	* [http://en.wikipedia.org/wiki/Audible.com Wikipedia entry]		* [http://en.wikipedia.org/wiki/Audible.com Wikipedia entry]

			To find files, use Google "filetype:aa audible".

	=== File format ===		=== File format ===

2009-08-20T00:07:32Z

← Older revision		Revision as of 17:07, 19 August 2009
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	video = File.new(ARGV[0])		video = File.new(ARGV[0])
	puts "File size: #{video.read(4).unpack('N')[0].~~ti_i~~}"		puts "File size: #{video.read(4).unpack('N')[0].to_i}"
	video.read(0xb4) # skip header		video.read(0xb4) # skip header
	sizes = video.read(4).unpack('N')		sizes = video.read(4).unpack('N')
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	Sample output (stripped):		Sample output (stripped):

			File size: 5762745
			Number of entries: 19
			...
	13 key(5)=codec value(7)=acelp85		13 key(5)=codec value(7)=acelp85
	16 key(10)=HeaderSeed value(10)=1158166611		16 key(10)=HeaderSeed value(10)=1158166611
	18 key(9)=HeaderKey value(43)=3759801365 1641076194 2988088058 4282540117		18 key(9)=HeaderKey value(43)=3759801365 1641076194 2988088058 4282540117
	19 key(15)=EncryptedBlocks value(5)=39333		19 key(15)=EncryptedBlocks value(5)=39333
			...
	~~Probably a seek~~ table ~~starts at 0x5f8~~:		Number of packet table entries: 5461
			type=0 offset=0
			type=0 offset=1045
			...

	[[Category: Container Formats]]		[[Category: Container Formats]]

2009-08-20T00:06:23Z

@@ Line 8: / Line 8: @@
 * [http://en.wikipedia.org/wiki/Audible.com Wikipedia entry]
-==== Parsing metadata ====
+=== File format ===
-This following Ruby code works for parsing the metadata on the only sample available. This table starts at 0xb8.
+The file is built up of 5 parts:
    video = File.new(ARGV[0])
-   video.read(184) # skip header
+   puts "File size: #{video.read(4).unpack('N')[0].ti_i}"
    sizes = video.read(4).unpack('N')
    puts "Number of entires: #{sizes[0].to_i}"
@@ Line 22: / Line 52: @@
      value = video.read(sizes[0].to_i+1)
      puts "#{x} key(#{sizes[0].to_i})=#{key} value(#{sizes[0].to_i)=#{value}"
+   }
@@ Line 33: / Line 70: @@
 Probably a seek table starts at 0x5f8:
 [[Category: Container Formats]]

2009-08-19T23:38:54Z

← Older revision		Revision as of 16:38, 19 August 2009
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	video = File.new(ARGV[0])		video = File.new(ARGV[0])

	video.read(184) # skip header		video.read(184) # skip header
	sizes = video.read(4).unpack('N')		sizes = video.read(4).unpack('N')
	puts "Number of entires: #{sizes[0].to_i}"		puts "Number of entires: #{sizes[0].to_i}"
	video.read(1) # skip		video.read(1) # skip

	(1..sizes[0].to_i).each { \|x\|		(1..sizes[0].to_i).each { \|x\|
	sizes = video.read(8).unpack('NN')		sizes = video.read(8).unpack('NN')

2009-08-19T23:37:56Z

← Older revision		Revision as of 16:37, 19 August 2009
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	==== Parsing metadata ====		==== Parsing metadata ====

	This following Ruby code works for parsing the metadata on the only sample available. This table starts at ~~0xbd~~.		This following Ruby code works for parsing the metadata on the only sample available. This table starts at 0xb8.

	video = File.new(ARGV[0])		video = File.new(ARGV[0])
	video.read(~~189~~) # skip header
	(1..19).each { \|x\|		video.read(184) # skip header
			sizes = video.read(4).unpack('N')
			puts "Number of entires: #{sizes[0].to_i}"
			video.read(1) # skip

			(1..sizes[0].to_i).each { \|x\|
	sizes = video.read(8).unpack('NN')		sizes = video.read(8).unpack('NN')
	key = video.read(sizes[0].to_i)		key = video.read(sizes[0].to_i)

2009-08-19T23:26:57Z

← Older revision		Revision as of 16:26, 19 August 2009
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	==== Parsing metadata ====		==== Parsing metadata ====

	This following Ruby code works for parsing the metadata on the only sample available:		This following Ruby code works for parsing the metadata on the only sample available. This table starts at 0xbd.

	video = File.new(ARGV[0])		video = File.new(ARGV[0])
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	18 key(9)=HeaderKey value(43)=3759801365 1641076194 2988088058 4282540117		18 key(9)=HeaderKey value(43)=3759801365 1641076194 2988088058 4282540117
	19 key(15)=EncryptedBlocks value(5)=39333		19 key(15)=EncryptedBlocks value(5)=39333

			Probably a seek table starts at 0x5f8:

			type(32) [1 - meta?, 2 - audio packets, 3 - meta?, 4 - meta?]
			offset(32) [must be relative, as the first entry in the list is always 0]

	[[Category: Container Formats]]		[[Category: Container Formats]]

2009-08-19T23:08:40Z

← Older revision		Revision as of 16:08, 19 August 2009
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			* Company: Audible.com
			* Samples: http://samples.mplayerhq.hu/audible/

	Proprietary container format from audible.com. There is no published specification. It may contain one of five different encodings which are numbered 1 thru 5. 1-3 are rumored to be [[ACELP.net]] at varying bitrates. #4 is [[MP3]]. #5 is some unknown Sony format.		Proprietary container format from audible.com. There is no published specification. It may contain one of five different encodings which are numbered 1 thru 5. 1-3 are rumored to be [[ACELP.net]] at varying bitrates. #4 is [[MP3]]. #5 is some unknown Sony format.