mythtv at cvs
Dec 26, 2008, 9:43 AM
Post #15 of 35
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#5473: audio out, PulseAudio
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Reporter: Alan Calvert <cal [at] graggrag> | Owner: ijr
Type: patch | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: head
Severity: medium | Resolution:
Mlocked: 0 |
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Comment(by IntuitiveNipple):
I've back-ported this patch to 0.21+fixess18722 (for Ubuntu Intrepid).
Aside from the re-factoring required to deal with using QT3 rather than
QT4, and the MythTV changes, I found a few issues some of which are not
yet resolved:
1. Mixed use of USE_PULSEAUDIO and USING_PULSEAUDIO confused things. I've
used USING_PULSEAUDIO throughout.
2. Mixer name needs to be "!PulseAudio:default" (not "!PulseAudio") in
globalsettings.cpp !AudioOutputDevice():
{{{
diff --git a/programs/mythfrontend/globalsettings.cpp
b/programs/mythfrontend/globalsettings.cpp
index b1012d1..b8ff8cb 100644
--- a/programs/mythfrontend/globalsettings.cpp
+++ b/programs/mythfrontend/globalsettings.cpp
@@ -168,6 +171,9 @@ static HostComboBox *MixerDevice()
#ifdef USING_WINAUDIO
gc->addSelection("Windows:", "Windows:");
#endif
+#ifdef USING_PULSEAUDIO
+ gc->addSelection("PulseAudio:default", "PulseAudio:default");
+#endif
return gc;
}
}}}
Not yet resolved:
3. Matching the number of !PulseAudio channels. On a 7.1 channel audio
system MythTV only outputs 5.1 maximum (doesn't output Side Left/Right).
This looks to be easily fixable but I need to check before making changes.
4. Occasional "!PulseAudio Error: stream buffer underflow" reports. No
clues to the reason yet.
5. Occasional bursts of static when changing to new channel (sounds like a
16-bit sample getting out of step by 8 bits). This will sometimes self-
correct (another 8 bits dropped would align the samples correctly again).
6. Frequently audio is lost completely for long periods, with the report
"NVP::!AddAudioData():p1: Audio buffer overflow, audio data lost!"
7. Seemingly excessive CPU load by the pulseaudio process and
mythtvfrontend.real when using !PulseAudio. I need to do more systematic
comparisons before confirming this.
I'll attach the current patch I'm using in Ubuntu Intrepid and update as I
make progress with the discovered issues.
--
Ticket URL: <http://svn.mythtv.org/trac/ticket/5473#comment:14>
MythTV <http://www.mythtv.org/>
MythTV
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