Re: [Gwc-general] Endian issues on powerpc

[Jeff W. <we...@ha...>]

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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