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Re: [Discuss-gnuradio] initial gr-audio-portaudio

From: Stephane Fillod
Subject: Re: [Discuss-gnuradio] initial gr-audio-portaudio
Date: Sun, 12 Mar 2006 22:20:16 +0100
User-agent: Mutt/1.5.11

On Sun, Mar 12, 2006 at 02:36:21PM -0500, Robert McGwier wrote:
> That is why I put the message out.  It will be good to have a working 
> starting point.

Okay, there it is. Just checked in to gr-audio-portaudio repository.
It's somewhat working, but there's still some static in the audio 
output (tested with ALSA playback, mono and stereo). Some more work
is needed.

You will need the attached patchs:

- against gnuradio-core: ot_gri_ringbuffer.patch
        * src/lib/omnithread/omnithread.h: add omni_mutex::trylock
        * src/lib/general/gri_ringbuffer.{cc,h},
          src/lib/general/Makefile.am: new lockless ringbuffer (single
          reader/single writer) taken from JACK software (GPL).

- against portaudio-V19(CVS): portaudio-pkg-config.patch
        * pkg-config .pc file with proper THREAD_FLAGS

The code should be portable. I was missing the native Win32 call for
mutex_trylock, so someone will have to find it, and define
OMNI_MUTEX_TRYLOCK_IMPLEMENTATION in src/lib/omnithread/ot_nt.h,
with appropriate semantic (return value).

The gri_pa_find_device_by_name() function will have to be made more
smart, like accepting which HostApi (ALSA, JACK, ..) is to be chosen,
and which device from this API. A syntax will have to be agreed upon,
like "ALSA:hw:0" or "OSS:/dev/dsp1".

Have fun,

Attachment: ot_gri_ringbuffer.patch
Description: Text document

Attachment: portaudio-pkg-config.patch
Description: Text document

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