Re: mp3 file making CAAudioFile spin in BasicRead()
Re: mp3 file making CAAudioFile spin in BasicRead()
- Subject: Re: mp3 file making CAAudioFile spin in BasicRead()
- From: Stephen Davis <email@hidden>
- Date: Wed, 14 Dec 2005 11:33:29 -0800
The file appears to have been corrupted somehow and there a bunch of
bad packets in it. Not sure what is causing the audio file parser to
infinite loop but the iTunes decoder asserts all over the place when
playing this file and there are audible clicks and pops when the
asserts fire.
As Jeff says, it's best to file a radar and attach the file so the
issue can be tracked within Apple.
stephen
On Dec 14, 2005, at 11:25 AM, Jeff Moore wrote:
The file appears to put the parser into some kind of infinite loop.
The best thing for you to do is to file a bug that includes the
file. You should also provide a sample(1) trace of the afinfo
process rather than a backtrace from stopping in GDB. That will
give a better overall picture of what's going on in the process.
On Dec 13, 2005, at 10:08 PM, Brian Whitman wrote:
While testing my app (it uses CAAudioFile as a simple "anything to
PCM" converter) on my iTunes library, I found one mp3 file (linked
below) that completely hangs the program. On investigation the
same file hangs any app I could find that uses CAAudioFile during
the file->open call. It plays fine in iTunes and QT, I don't
remember the provenance of the file but iTunes claims it was
encoded with iTunes 4.9.
It's frustrating as I don't want malformed songs to hang my app,
there seems to be no way of getting out of the loop or detecting
if it will happen. Looking a debug trace shows:
CAAudioFile::GetExistingFileInfo
CAAudioFile::InitFileMaxPacketSize
AudioFileProperty
MP3AudioFile::GetProperty
MP3AudioFile::UpdatePacketTable
MP3AudioFile::GetFPosForNextSyncWord
Cached_DataSource::ReadBytes
MacFile_DataSource::ReadBytes
FSReadFork
PBReadForkSync
BasicRead (which spins and eats up all CPU)
How to replicate: build the AudioFileTools.
cd /Developer/Examples/CoreAudio/Services/AudioFileTools/build...
curl -O http://variogr.am/clarity.mp3
./afinfo clarity.mp3
--
Jeff Moore
Core Audio
Apple
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