ALAC 0.2
Updated on 17 Sep 2011
By Anthony Buckner
By Anthony Buckner
19 MB Safe To Install
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Specifications
License:
Freeware
Updated:
Downloads:
1109
Platform:
PPC, Mac OS
Publisher:
David Hammerton(more)
Website:
User Reviews:
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ALAC?
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Publisher's Descriptions
A basic decoder for Apple Lossless Audio Codec files (ALAC). ALAC is a proprietary lossless audio compression scheme. Apple never released any documents on the format. What I provide here is a C implementation of a decoder, written from reverse engineering the file format. It turns out that most of the algorithms in the codec are fairly well known. ALAC uses an adaptive FIR prediction algorithm and stores the error values using a modified rice or golumb algorithm. Further details are in alac.c.
Although an encoder is not provided, by using the decoder as a sort of specification it should be fairly trivial to write an encoder. By exploiting other lossless audio encoders, such as FLAC, the task will be much easier. Although one wouldn't be able to copy the compression algorithms verbatim, as adaptive compression is used in ALAC and not in FLAC. There are, however, a bunch of academic papers on the issue.
The program located here will not be able to handle all ALAC files, it can only handle mono or stereo files. ALAC allows up to 8 channels. It should be trivial to finish the implementation once I find files that I can test it with. Likewise the decoder only supports 16bit sample sizes. Again, it should be trivial to fix.
The decoder is fairly self-explanatory, it can read an ALAC stream from either a file or from stdin, and write it as raw PCM data or as a WAV file to either stdout or a file. In theory one should be able to stream data to the decoder.
Want to help? Click here.
Although an encoder is not provided, by using the decoder as a sort of specification it should be fairly trivial to write an encoder. By exploiting other lossless audio encoders, such as FLAC, the task will be much easier. Although one wouldn't be able to copy the compression algorithms verbatim, as adaptive compression is used in ALAC and not in FLAC. There are, however, a bunch of academic papers on the issue.
The program located here will not be able to handle all ALAC files, it can only handle mono or stereo files. ALAC allows up to 8 channels. It should be trivial to finish the implementation once I find files that I can test it with. Likewise the decoder only supports 16bit sample sizes. Again, it should be trivial to fix.
The decoder is fairly self-explanatory, it can read an ALAC stream from either a file or from stdin, and write it as raw PCM data or as a WAV file to either stdout or a file. In theory one should be able to stream data to the decoder.
Want to help? Click here.
Do you like
ALAC?
ALAC?
System Requirements
PPC, Mac OS X 10.2 or later.
What's New
Version 0.2: Release notes were unavailable when this listing was updated.
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ALAC Disclamer
Please be aware FindMySoft.com accepts no responsibility for the file you are downloading. The same applies to the information provided about the software products listed.
We do not allow the inclusion of any ALAC serial, keygen or crack and we disclaim any liability for the inappropriate use of ALAC.
FindMySoft advises that ALAC should be only used in accordance with the rules of intellectual property and the existing Criminal Code.
For your own protection ALWAYS check downloaded files for viruses.
We do not allow the inclusion of any ALAC serial, keygen or crack and we disclaim any liability for the inappropriate use of ALAC.
FindMySoft advises that ALAC should be only used in accordance with the rules of intellectual property and the existing Criminal Code.
For your own protection ALWAYS check downloaded files for viruses.
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