I think I have stumbled on a problem with FMOD 3.7 on P4 CPUs with Hyperthreading enabled.
I found it playing around with the Visual Basic Sample application, and reproduced it myself in C.
When I stream an MP3 with the FSOUND_Stream interface, it plays fine. Then when I load an MP3 into memory with FSOUND_Sample_Load, the stream output starts to crackle and bleep.
It only happens with the sample and stream being MP3, I played around with combinations of WAV, MP3, and OGG (I didn’t bother with WMA/ASF) and was unable to reproduce the problem.
I tried to reproduce the error on my PC with Hyperthreading enabled and the problem occured, I disabled Hyperthreading and it stopped, then I tested on my other older box P4 (Non-HT), and it also didn’t occur.
So, what do you think?
Okay, here is a binary & c source for it demonstrating the error.
I noticed that if I use a teeny tiny MP3, about 1sec for the sample, the glitch doesn’t occur, but it does for a 30sec sample.
You will need to supply your own MP3s for the compiled exe, just put a stream.mp3 and a sample.mp3 in the directory with it. I use a song for stream.mp3 and a short audio clip (> 30sec) for sample.mp3
I am running an Audigy Platinum with drivers versioned 220.127.116.113 (11/04/2003)
It also happens with my onboard SoundMAX 6ch setup.
And the rest of my system for refrence
Pentium4 3Ghz HT
Asus P4C800 Deluxe Mainboard
Onboard 3Com Gigabit 3C940 Ethernet
Promise PD20378 SATA-150/UDMA-133 RAID Controller
Leadtek GeForceFX 5900 Ultra (256Mb, 8x AGP, Det 45.23)
2x512Mb Corsair DDR400 Matched Pair
2x120Gb Segate SATA HDDs in RAID
1x60Gb Maxtor HDD
Sony DRU-510A DVD+-RW
Pioneer 16x DVD
CrystalFontz CF633 USB LCD Unit
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