crash-proof AU plugin scanning?
crash-proof AU plugin scanning?
- Subject: crash-proof AU plugin scanning?
- From: "Ross Bencina" <email@hidden>
- Date: Wed, 30 Jun 2010 16:42:36 +1000
Hi
At startup I scan AU plugins and cache some details (supported channels
etc). Pretty much
like what Logic does as far as I can tell from this:
http://developer.apple.com/mac/library/technotes/tn2007/tn2207.html
Problem is, this means running code in the plugin, which can cause a crash
when my host starts, like this one:
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 com.futurenet.CMplay 0x1c41ee81
CMuonAudioPluginFXunit::doVolumes() + 219
1 com.futurenet.CMplay 0x1c434232
CMuonBypassFX::cookParameters(bool) + 584
2 com.futurenet.CMplay 0x1c4a47f3
CMuonTachyonSynth::cookParameters(bool) + 1069
3 com.futurenet.CMplay 0x1c4a8a2c
CMuonTachyonSynth::recallMulti() + 246
4 com.futurenet.CMplay 0x1c4aa0b1 CMuonTachyonSynth::reset(int,
int) + 593
5 com.futurenet.CMplay 0x1c531524 CMuonTachyon::initprocess() +
280
6 com.futurenet.CMplay 0x1c531991
CMuonTachyon::CMuonTachyon(ComponentInstanceRecord*) + 433
7 com.futurenet.CMplay 0x1c531d3d CMuonTachyonEntry + 73
8 ...ple.CoreServices.CarbonCore 0x92860ce5 CallComponentDispatch + 29
9 ...ple.CoreServices.CarbonCore 0x92860cc6 CallComponentOpen + 43
10 ...ple.CoreServices.CarbonCore 0x9285ef94 OpenAComponent + 433
11 ...ple.CoreServices.CarbonCore 0x92864909 OpenComponent + 24
I guess I need to implement my scanner in a separate process or use fork()
or something to avoid this kind of startup crash. Can anyone recommend a
best-practice approach for crash proofing AU scanning ? Given the problems
I'm currently seeing with PACE protected pluigns I'm a little wary of doing
the scanning in a separate process without knowing it will work.
For VST I just pre-flight the bundle to get some assurance it's real, but
for AU I need to get channel info so I have to load the plugin to query it
(would have been nice if this metadata was stored in the bundle's plist, oh
well)..
Thank you
Ross.
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