25 Jul
2007
25 Jul
'07
6:37 p.m.
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(a)slinkp.com> 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(a)trustedcs.com
Software Engineer - Hildstrom Engineering
geocities.com/hildstrom
hildstrom(a)yahoo.com
Mobile:(210)413-6082
Fax:(210)599-0469
Office:(210)340-3151x117
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--
Paul Winkler
http://www.slinkp.com
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