Crash deep inside CoreAudio

Subject: Crash deep inside CoreAudio
From: Evan Olcott <email@hidden>
Date: Tue, 19 Jul 2005 09:31:53 -0500
Delivered-to: email@hidden
Delivered-to: email@hidden

OK - under what circumstances would I get a crash in CoreAudio like this?

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_INVALID_ADDRESS (0x0001) at 0x06555820

Thread 9 Crashed: 0 ....audio.toolbox.AudioToolbox 0x940ceb9c SwapInt16ToFloat32_Altivec + 580 1 ....audio.toolbox.AudioToolbox 0x9405f130 CBRConverter::RenderOutput(CABufferList*, unsigned long, unsigned long&, AudioStreamPacketDescription*) + 204 2 ....audio.toolbox.AudioToolbox 0x9405ee5c BufferedAudioConverter::FillBuffer(unsigned long&, AudioBufferList&, AudioStreamPacketDescription*) + 292 3 ....audio.toolbox.AudioToolbox 0x9405efd8 AudioConverterChain::RenderOutput(CABufferList*, unsigned long, unsigned long&, AudioStreamPacketDescription*) + 136 4 ....audio.toolbox.AudioToolbox 0x940c6c68 AudioConverterChain::ConvertBuffer(unsigned long, unsigned char*, unsigned long&, unsigned char*) + 180 5 ....audio.toolbox.AudioToolbox 0x94080398 AudioConverterConvertBuffer + 168 6 com.audioƒile.SampleManager 0x00021978 -[AFAudioFileWrapper (ReadWrite) loadBufferFromPCMSource:toBufferList:reverse:] + 2740 (AFAudioFileWrapper_ReadWrite.m:252)

This is after a rather long (85 item) stack of Audio Units and what not - and this happens *rarely* and *intermittently* (mostly it works without a hitch) but it's mostly right there at "SwapInt16ToFloat32_Altivec". What the heck is it getting from me that's causing it to black out right there?

Take note that this is not the main thread, nor is it the CoreAudio thread - but a "processing" thread where I have built a separate AUGraph for this task. Could there be some thread conflict going on here?

Anyone seen this before or have an idea of what poor "SwapInt16ToFloat32_Altivec" might be choking on?

TIA


Ev
Technical Knowledge Officer
Head Programmer/Designer
Audiofile Engineering

http://www.audiofile-engineering.com/


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