Gnome Wave Cleaner

Hi Digger,

Libsndfile says it has been tested for linux/powerpc's.  So
my next guess might be the implemenation of ALSA on the powerpc,
and perhaps GWC isn't delivering audio data correctly to the ALSA
device on the powerpc.

I don't have a powerpc, so I can only look for clues with google.  Anyone
else out there have a powerpc and linux?

Cheers,
Jeff


digger vermont wrote:
> Hello,
>
> I'd love to get to work on some of my vinyl with gwc, but alas, playing
> a wav file through it is mostly static.
>
> I'm using linux on a powerpc which is big endian.  My past experience
> tells me it's an endian issue.  I have the same results regardless of
> whether I use an Ubuntu Feisty package or build it myself.  With or
> without Alsa enabled. The Ubuntu is version 0.21.05-1ubuntu1 and the
> source I've used is version gwc-0.21-07.
>
> I've tried looking into it and my uneducated guess it has to do with the
> configuration of libsndfile.
>
> I'm hoping you'll have some thoughts or ideas.
>
> Thanks,
>
> digger
>
>
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Hi Jeff,

Thanks for your reply

If I did not mention it before, my programing and programing skills are
at an early grade school level.

Having said that, I have gotten gwc to playback correctly!  In
audio_util.c I changed 

format_set = GWC_S16_LE to format_set = GWC_S16_BE at line 108.

I know its not a good solution, if a solution at all, but it does show
that the audio playback problem is endian in nature.  Is there away that
BE can be defined if its a powerpc?  I'd be glad give any patches a try.

Another question then would be, will the endian issue also cause
problems in any of the noise, click, etc, processing?

Thanks

digger

At this point any of my other responses below are probably moot.

On Sat, 2007-02-17 at 21:55 -0800, Jeff Welty wrote: 
> Hi Digger,
> 
> Libsndfile says it has been tested for linux/powerpc's.  So
> my next guess might be the implemenation of ALSA on the powerpc,
> and perhaps GWC isn't delivering audio data correctly to the ALSA
> device on the powerpc.
> 
> I don't have a powerpc, so I can only look for clues with google.  Anyone
> else out there have a powerpc and linux?
> 
> Cheers,
> Jeff
> 

My original thought was the configuration of libsndfile regarding
big-endian.  But ya know, looking and checking further, my pointing at
libsndfile does seem wrong.

I started over trying to troubleshoot.  First just to make sure.  The
file utility reports that the sound file I'm testing with is 

RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo
44100 Hz

I believe that should work.

I did a make clean compiled gwc with and without alsa support.  I also
tried using gwc (without alsa) along with aoss and padsp (pulseaudio).
All have the same results of the static/noise on playback.

Looking for things to try I did File>Save-As the test file.  It does
playback correctly from the commandline using aplay.

Excellent sleuthing digger!

I don't think the endian issues will be a problem in the 
declicking/denoising,
because gwc requests floating point values from libsndfile for the audio 
data.
Libsndfile is handling all the conversion and endian-ness.

Let's get some info from another powerpc/linux user before going forward
with a patch -- presumably we can detect that with the configure script.

Until then, have fun with gwc :-)

Good work!
Jeff

digger vermont wrote:
> Hi Jeff,
>
> Thanks for your reply
>
> If I did not mention it before, my programing and programing skills are
> at an early grade school level.
>
> Having said that, I have gotten gwc to playback correctly!  In
> audio_util.c I changed 
>
> format_set = GWC_S16_LE to format_set = GWC_S16_BE at line 108.
>
> I know its not a good solution, if a solution at all, but it does show
> that the audio playback problem is endian in nature.  Is there away that
> BE can be defined if its a powerpc?  I'd be glad give any patches a try.
>
> Another question then would be, will the endian issue also cause
> problems in any of the noise, click, etc, processing?
>
> Thanks
>
> digger
>
> At this point any of my other responses below are probably moot.
>
> On Sat, 2007-02-17 at 21:55 -0800, Jeff Welty wrote: 
>   
>> Hi Digger,
>>
>> Libsndfile says it has been tested for linux/powerpc's.  So
>> my next guess might be the implemenation of ALSA on the powerpc,
>> and perhaps GWC isn't delivering audio data correctly to the ALSA
>> device on the powerpc.
>>
>> I don't have a powerpc, so I can only look for clues with google.  Anyone
>> else out there have a powerpc and linux?
>>
>> Cheers,
>> Jeff
>>
>>     
>
> My original thought was the configuration of libsndfile regarding
> big-endian.  But ya know, looking and checking further, my pointing at
> libsndfile does seem wrong.
>
> I started over trying to troubleshoot.  First just to make sure.  The
> file utility reports that the sound file I'm testing with is 
>
> RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo
> 44100 Hz
>
> I believe that should work.
>
> I did a make clean compiled gwc with and without alsa support.  I also
> tried using gwc (without alsa) along with aoss and padsp (pulseaudio).
> All have the same results of the static/noise on playback.
>
> Looking for things to try I did File>Save-As the test file.  It does
> playback correctly from the commandline using aplay.
>
>
>
>     
>
>
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> Join SourceForge.net's Techsay panel and you'll get the chance to share your
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> Gwc-general@...
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>
>