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
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 do
Gregory Alan Hildstrom wrote:
> I tested against flac, lpac, shorten, and monkey's audio for lossless
> encoding. j2kaudio beat the nearest competition by over 10%.
Nicely done.
> If anyone is motivated to test some additional songs, provide me with
> additional test data, or suggest another un
Gregory Alan Hildstrom wrote:
> Can wav files store 32b float?
Yes, there are at least 8 file formats supported by libsndfile that
accept 32 bit float data. Most of these also accept 64 bit double
precision float data, but I personally don't see the point in going
beyond 32 bit float.
Erik
--
Dne středa 25 červenec 2007 21:47 Gregory Alan Hildstrom napsal(a):
> http://geocities.com/hildstrom/projects/j2kaudio/index.html
>
> Let me know what you think. Thanks. -Greg
Looks nice, though I would rather see some widely accepted multimedia
container, than just another audio compression cod
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 easi
On Wed, Jul 25, 2007 at 12:47:16PM -0700, Gregory Alan Hildstrom wrote:
> ... or suggest another untested codec ...
http://www.true-audio.com/
http://www.musepack.net/
http://www.speex.org/
http://www.wavpack.com/
I'm most interested in the last.
--
Thorsten Wilms
Thorwil's Design for Free S
Thorsten Wilms wrote:
> > - Have you thought of putting your codec data inside other standard
> > container formats like WAV, Caf and Ogg?
>
> Or Matroska. Ogg and Matroska are not (yet?) supported by libsndfile,
> though.
Unfortunately, Ogg seems to be a surprisingly difficult. To fit
ea
On Thu, Jul 26, 2007 at 07:04:18AM +1000, Erik de Castro Lopo wrote:
>
> - Do you have any thoughts/plans on adding metadata like song title,
> artist, copyright info etc?
Besides using an existing container format, there are the metadata
standards id3, APE and Vorbis Comment.
http://www.
Hello Erik,
On Thu, July 26, 2007 15:28, Erik de Castro Lopo wrote:
> When it was explained to him how seriously huge the dynamic range of
> 64 bits actually is, he dropped the idea.
on another list someone did the math and found that 32 bit integers alredy
need a pressure above the atmospheric p
On Thu, Jul 26, 2007 at 09:35:27AM +0200, Thorsten Wilms wrote:
> On Wed, Jul 25, 2007 at 04:19:03PM -0400, Paul Winkler wrote:
> > 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.
>
> WavPack does it.
> http://
I certainly appreciate everyone's comments.
I have 16-bit, 8-bit, mono, and stereo tested at many differrent sample rates
so far, but it
should be able to handle any number of channels < 65536. I will work to make it
flexible enough to
handle 24-bit, 32-bit, and 64-bit, but no promises. =;)
I h
Forest Bond wrote:
> > "There is no reason why anyone would want a computer in their home"
> > Ken Olson, DEC, 1977
>
> Why is it ironic to see those statements right next to each other? ;)
Err, because its not?:-)
> (Not looking to open a can of worms; I know they are not equivalent due to th
On Thu, Jul 26, 2007 at 10:59:33AM +0800, Victor Roetman wrote:
> Openoffice's .odt files and Microsoft's .docx files are merely zip
> containers with directory structure and files inside. You could just do
> something like that, and it would be very easy to take apart again. It
> would also no
On Wed, Jul 25, 2007 at 04:19:03PM -0400, Paul Winkler 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.
WavPack does it.
http://www.wavpack.com/
--
I just tested OptimFROG and LA, which both outcompressed Monkey's Audio on the
song, but j2kaudio
still beat LA by 8.4%. LA was slower than j2kaudio, but OptimFROG was faster.
j2kaudio is still
the compression leader on my small test set. The results are in the table on my
page.
--- Gregory Ala
On Thu, Jul 26, 2007 at 07:08:29AM +1000, Erik de Castro Lopo wrote:
> Yes, there are at least 8 file formats supported by libsndfile that
> accept 32 bit float data. Most of these also accept 64 bit double
> precision float data, but I personally don't see the point in going
> beyond 32 bit float
It probably would suffer some, but it would still be better than raw. The MSBs
should compress
well, just as if it were reduced to 16-bit; the frequencies should not change.
The LSBs would be
pretty erratic though; like trying to compress noise. But you don't know unless
you test.
Can wav files
Could do that... I wonder if the compression ratio would suffer,
though. Just a hunch.
-PW
On Wed, Jul 25, 2007 at 01:37:18PM -0700, Gregory Alan Hildstrom wrote:
> The JasPer library documentation states that a single image component can be
> from 1 to 16 bits per
> sample, so not directly. 24
Ctirad Fertr wrote:
> Currently I store my
> albums into one flac file per CD plus separate CUE sheet. It's far from
> perfect. I would like to have just one file per album with all the content
> inside (eg. audio, pictures, lyrics, videoclips, bonuses, etc...) and player
> with direct acces t
Hello again. I discovered a disappointing, to me, bug in j2kaudio/libjasper
today while I was
working on 32-bit audio support.
My previous holy-grail-looking lossless audio compression test results were
incorrect. I was
passing rate=1 to the JasPer JPEG 2000 encoder, which was not performing
lo
bad luck mate, it's always good to see people willing to give something a go
though :)
porl
On 01/08/07, Gregory Alan Hildstrom <[EMAIL PROTECTED]> wrote:
>
> Hello again. I discovered a disappointing, to me, bug in
> j2kaudio/libjasper today while I was
> working on 32-bit audio support.
>
> My
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