why would a plugin be running SRC? threading rules?
why would a plugin be running SRC? threading rules?
- Subject: why would a plugin be running SRC? threading rules?
- From: Paul Davis <email@hidden>
- Date: Sun, 10 Jan 2010 13:34:07 -0500
this is a trace of ardour running the apple graphic EQ plugin. i'm
curious about why this plugin would be running SRC internally ... any
ideas? the only justification i could think of was something like
upsampling for "improved quality", but this seemed unlikely to me.
in addition, i get the impression that there are some implicit thread
rules being violated by ardour. the trace below shows the plugin being
deactivated, but from a thread other than the RT/Audio/process thread
that would be calling render. i know that the RT/Audio/process thread
is not active when this happening, but is there something i missed in
the AU spec that says that you shouldn't be crossing thread boundaries
like this?
0 ...pple.audio.units.Components 0x700164c8
AUSampleRateConverterEntry + 952
1 ...pple.audio.units.Components 0x7004006a SystemOutputAUEntry + 2762
2 ...pple.audio.units.Components 0x7005abbe AUGraphicEQEntry + 46
3 ...ple.CoreServices.CarbonCore 0x95dfb935 CallComponentDispatch + 29
4 ...apple.audio.units.AudioUnit 0x93099aa1 AudioUnitReset + 49
5 libardour.dylib 0x134bf0f9
CAAudioUnit::GlobalReset() + 41 (CAAudioUnit.h:154)
6 libardour.dylib 0x133fedf2
ARDOUR::AUPlugin::deactivate() + 28 (audio_unit.cc:702)
7 libardour.dylib 0x1333ea7e
ARDOUR::PluginInsert::deactivate() + 60 (insert.cc:273)
8 libardour.dylib 0x133861f0
ARDOUR::Route::flush_redirects() + 84 (route.cc:2465)
9 libardour.dylib 0x133df688
ARDOUR::Session::flush_all_redirects() + 84 (session_transport.cc:655)
10 libardour.dylib 0x133e2e8e
ARDOUR::Session::non_realtime_stop(bool, int, bool&) + 1320
(session_transport.cc:415)
11 libardour.dylib 0x133e3c25
ARDOUR::Session::butler_transport_work() + 1221
(session_transport.cc:271)
12 libardour.dylib 0x13396e0a
ARDOUR::Session::butler_thread_work() + 1068 (session_butler.cc:243)
13 libardour.dylib 0x1339789c
ARDOUR::Session::_butler_thread_work(void*) + 172
(session_butler.cc:161)
14 libSystem.B.dylib 0x925c2155 _pthread_start + 321
15 libSystem.B.dylib 0x925c2012 thread_start + 34
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