Not sure how I managed that one, so I've reattached it. Alternatively,
you can run:
svn diff -r1870:1871 > mixxx_alsarealtime.patch
Albert
On Mon, 2008-03-03 at 17:42 -0500, Garth Dahlstrom wrote:
> Ditto, nothing there.
>
> On Mon, Mar 3, 2008 at 5:33 PM, Adam Davison <[EMAIL PROTECTED]>
> wrote:
> When i tried to open the attached patch, it was 0k and had
> nothing in
> it. Or is that just me?
>
>
> On 03/03/2008, Albert Santoni <[EMAIL PROTECTED]> wrote:
> > Hi guys,
> >
> > I've just committed some code to SVN that tries to
> dynamically resolve
> > this extension in PortAudio that lets us request a realtime
> priority
> > callback when using ALSA. That means you don't need to
> patch PortAudio
> > to take advantage of this, and all users running an RT
> kernel should
> > experience a nice performance boost with latest SVN.
> >
> > If anyone's interested in how I did this, take a look at
> the patch
> > attached.
> >
> > Enjoy,
> >
> > Albert
> >
>
> >
>
> -------------------------------------------------------------------------
> > This SF.net email is sponsored by: Microsoft
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> > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> > _______________________________________________
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> > [email protected]
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> >
> >
> >
>
>
> -------------------------------------------------------------------------
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>
>
> --
> __
> --- == __/ t.O ==--
> http://stacktrace.org/
Index: src/sounddeviceportaudio.cpp
===================================================================
--- src/sounddeviceportaudio.cpp (revision 1870)
+++ src/sounddeviceportaudio.cpp (revision 1871)
@@ -40,7 +40,6 @@
m_iNumberOfBuffers = 2;
m_iNumInputChannels = m_deviceInfo->maxInputChannels;
m_iNumOutputChannels = m_deviceInfo->maxOutputChannels;
-
}
SoundDevicePortAudio::~SoundDevicePortAudio()
@@ -195,6 +194,20 @@
qDebug() << "Opened PortAudio stream successfully... starting";
}
+ //Attempt to dynamically load and resolve stuff in the PortAudio library
+ QLibrary portaudio("libportaudio.so.2");
+ if (!portaudio.load())
+ qDebug() << "Failed to dynamically load PortAudio library";
+ else
+ qDebug() << "Dynamically load PortAudio library!";
+
+ EnableAlsaRT enableRealtime = (EnableAlsaRT) portaudio.resolve("PaAlsa_EnableRealtimeScheduling");
+ if (rt)
+ {
+ enableRealtime(m_pStream, 1);
+ }
+ portaudio.unload();
+
// Start stream
err = Pa_StartStream(m_pStream);
if (err != paNoError)
Index: src/sounddeviceportaudio.h
===================================================================
--- src/sounddeviceportaudio.h (revision 1870)
+++ src/sounddeviceportaudio.h (revision 1871)
@@ -28,6 +28,11 @@
* when setting latency */
#define MIXXXPA_MAX_FRAME_SIZE 1024
+/** Dynamically resolved function which allows us to enable a realtime-priority callback
+ thread from ALSA/PortAudio. This must be dynamically resolved because PortAudio can't
+ tell us if ALSA is compiled into it or not. */
+typedef int (*EnableAlsaRT)(PaStream* s, int enable);
+
class SoundDevicePortAudio;
/** A struct to some stuff we need to pass along to the callback through PortAudio **/
-------------------------------------------------------------------------
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