Re: [LAD] new lossless/lossy audio compressor

The JasPer library documentation states that a single image component can be from 1 to 16 bits per
sample, so not directly. 24-bit color images are actually treated as 3 8-bit components: like one
red component, one green component, and one blue component.

For lossless compression, we could easily place the most significant 16 bits in the first image
component and place the least significant 16 bits in a second image component of each frame. It
should also be possible to code something up that does the same sort of 16-bit splitting into 2
flac files. -Greg

--- Paul Winkler <pw_lists@email-addr-hidden> wrote:

> Pretty cool. Does JPEG 2000 handle float data?
>
> I'd love to be able to write an archive script for Ardour sessions
> that compresses the audio data losslessly, but FLAC won't do it.
>
>
> -PW
>
> On Wed, Jul 25, 2007 at 12:47:16PM -0700, Gregory Alan Hildstrom wrote:
> > Hello. I just finished writing and documenting a new lossless and lossy audio codec called
> > j2kaudio. It uses the wavelet compression in JPEG 2000 to transcode audio wav data to and from
> j2a
> > files. I have not written any sort of media player plugin yet; more testing and file format
> > refinement are necessary first.
> >
> > I tested with 44100Hz, 16-bit, stereo CD-quality wav files, but it also supports other sample
> > rates, precisions, and channel numbers.
> >
> > I tested against flac, lpac, shorten, and monkey's audio for lossless encoding. j2kaudio beat
> the
> > nearest competition by over 10%.
> >
> > If anyone is motivated to test some additional songs, provide me with additional test data, or
> > suggest another untested codec, please let me know.
> >
> > http://geocities.com/hildstrom/projects/j2kaudio/index.html
> >
> > Let me know what you think. Thanks. -Greg
> >
> >
> > Gregory Alan Hildstrom
> > Secure Systems Engineer - Trusted Computer Solutions
> > trustedcs.com
> > ghildstrom@email-addr-hidden
> > Software Engineer - Hildstrom Engineering
> > geocities.com/hildstrom
> > hildstrom@email-addr-hidden
> > Mobile:(210)413-6082
> > Fax:(210)599-0469
> > Office:(210)340-3151x117
> > _______________________________________________
> > Linux-audio-dev mailing list
> > Linux-audio-dev@email-addr-hidden
> > http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev
>
> --
>
> Paul Winkler
> http://www.slinkp.com
> _______________________________________________
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> Linux-audio-dev@email-addr-hidden
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>

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Received on Thu Jul 26 00:15:07 2007