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« Return to Thread: Recording strangeness with OpenAL-Soft 1.8.466
Re: Recording strangeness with OpenAL-Soft 1.8.466
by Troy Yee
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Hi Chris:
Thanks for your response. The developer I have looking into this has reported the following:
Troy.
----- Original Message -----
From: Chris Robinson <chris.kcat@...>
Date: Wednesday, July 1, 2009 19:28
Subject: Re: [Openal] Recording strangeness with OpenAL-Soft 1.8.466
To: openal@...
> 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.
> _______________________________________________
> Openal mailing list
> Openal@...
> http://opensource.creative.com/mailman/listinfo/openal
>_______________________________________________
Openal mailing list
Openal@...
http://opensource.creative.com/mailman/listinfo/openal
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@...>
Date: Wednesday, July 1, 2009 19:28
Subject: Re: [Openal] Recording strangeness with OpenAL-Soft 1.8.466
To: openal@...
> 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.
> _______________________________________________
> Openal mailing list
> Openal@...
> http://opensource.creative.com/mailman/listinfo/openal
>
Openal mailing list
Openal@...
http://opensource.creative.com/mailman/listinfo/openal
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