[Openal] Recording strangeness with OpenAL-Soft 1.8.466

[Troy Yee]

Hi Chris:

Thanks for  your response.  The developer I have looking into this has reported the following:

In alsa.c: ALCboolean alsa_open_capture(..) function,
in line 632 and 658, the third passed in argument for
psnd_pcm_hw_params_set_format should be alsaFormat, instead of
data->format as alsaFormat is the format that the caller specified
when trying to open the capture device.

Looking at alsa_open_playback, an update was done by
replacing/renaming alsaFormat with data->format, and pass
data->format into psnd_pcm_hw_params_set_format.  I believe they
probably just missed the same update in alsa_open_capture(..).I don't have access to the code at the moment so I haven't been able to confirm the conclusion.

Troy.


----- Original Message -----
From: Chris Robinson <chris.kcat at gmail.com>
Date: Wednesday, July 1, 2009 19:28
Subject: Re: [Openal] Recording strangeness with OpenAL-Soft 1.8.466
To: openal at opensource.creative.com

> On Wednesday 01 July 2009 10:09:04 am Troy Yee wrote:
> > Has anyone noticed any problems capturing using OpenAL-Soft 
> 1.8.466 on
> > Linux?  I am currently looking into possible causes 
> (including test
> > environment weirdness).  The short of it is that a simple 
> app that
> > captures from the default capture device and writes captured 
> samples to
> > the default playback device has different behaviour when used 
> with a
> > previous instance of OpenAL-Soft (1.4.272 perhaps? which was 
> correct).> When LD_LIBRARY_PATH is set to point to older 
> library, all is fine.
> > When set to point to new library, the playback sounds like it 
> is faster
> > than it should be (speech sounds almost chipmunk-like but broken).
> > Capture and playback rates are being specified and match.
> 
> Hi.
> 
> It would be very helpful to paste a small test app (with code) 
> that shows the 
> error. The only thing of note is that newer versions are more 
> careful about 
> opening the capture device with the precise capture rate given 
> (as the OpenAL 
> capture spec requires). This shouldn't break apps, though.. at 
> least none that 
> aren't already broken.
> 
> It may be helpful to say which device is actually being used, by 
> callingalcGetString(device, ALC_CAPTURE_DEVICE_SPECIFIER);
> on the opened capture device (for both 1.4 and 1.8). Would also 
> be helpful to 
> know if PulseAudio is installed/active, or if you're using the 
> aoss script.
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