Apple

I'm having a rather bad time getting AudioFileSetProperty to write an AudioFileRegionList to a CAF file. I suspect the problem is the way that I'm allocating CFStrings.

Is this an appropriate way to allocate CFStrings when setting a marker.mName or region.mName?

rgn->mName = CFStringCreateWithFormat( kCFAllocatorDefault, NULL, CFSTR("Region-%d"), r );

My problem is that if I try to create a List that contains more than one Region, as soon as I call AudioFileSetProperty, I get "EXC_BAD_ACCESS." This happens unless I use a very small quantity of regions and markers. The debugger shows the exact place where AudioFileSetProperty falls over as either "CFStringGetLength" or "CAFRegion_NtoB(CAFRegion*)".

If I create only a single Region, and then use afinfo to view my file, I get this type of thing:

MacBook-Pro:~ username$ afinfo /Users/username/UnitTest_CAF_ANSI_C.caf
File: /Users/username/UnitTest_CAF_ANSI_C.caf
File type ID: caff
Num Tracks: 1
----
Data format: 1 ch, 44100 Hz, 'lpcm' (0x0000000E) 16-bit big-endian signed integer
no channel layout.
estimated duration: 5.001315 sec
audio bytes: 441116
audio packets: 220558
bit rate: 705600 bits per second
packet size upper bound: 2
maximum packet size: 2
audio data file offset: 4096
optimized
audio 220558 valid frames + 0 priming + 0 remainder = 220558
source bit depth: I16
1 regions; SMPTE time type 0 (none)
region 1, "Region-0", flags 00000000
marker 990, "Marker-990": frame 100 SMPTE time 0:00:00:00/0 type 1935828327 ('sbeg') channel 0
marker 991, "<unnnamed>": frame 200 SMPTE time 0:00:00:00/0 type 1936027236 ('send') channel 0
marker 992, "<unnnamed>": frame 300 SMPTE time 0:00:00:00/0 type 1935828327 ('sbeg') channel 0

The names should be "Marker-990" "Marker-991" "Marker-992" and so on.

Anyone have any ideas? I'm stumped, and after three days working on this, I can't find much outside information.

Thanks,

Charles

References:
	>How to correctly allocating CFStrings in an AudioFileRegionList? (From: Charles Constant <email@hidden>)