On Oct 5, 2008, at 09:47, Joseph Ayers wrote:
I'm trying to extract the audio samples from an audio buffer
returned from the QuickTime Audio extraction API into a
NSMutableArray of NSNumbers.
<snip>
The code I am using is:
AudioBufferList* abl;
NSMutableArray * ipbuf;
NSMutableArray * idbuf;
NSNumber* ipsamp;
NSNumber* idsamp;
unsigned short *ippointer = (unsigned short *)abl-
>mBuffers[0].mData;
unsigned short *idpointer = (unsigned short *)abl-
>mBuffers[1].mData;
for (isamp = 1; abl->mBuffers[0].mDataByteSize;isamp++){
[ipsamp initWithUnsignedShort:(unsigned short)ippointer[isamp]];
[ipbuf insertObject:ipsamp atIndex:isamp];
[idsamp initWithUnsignedShort:(unsigned short)idpointer[isamp]];
[idbuf insertObject:idsamp atIndex:isamp];
}
The program crashes on the line
[ipsamp initWithUnsignedShort:(unsigned short)ippointer[isamp]];
with
Program received signal: “EXC_BAD_ACCESS”.
Try this on for size:
// Edited in Mail -- not guaranteed to even compile
// Completely untested
AudioBufferList* abl = /* fetch valid AudioBufferList */;
NSMutableArray * ipbuf = [NSMutableArray array];
NSMutableArray * idbuf = [NSMutableArray array];
NSNumber* ipsamp = nil; // not strictly necessary
NSNumber* idsamp = nil;
unsigned short *ippointer = (unsigned short *)abl->mBuffers[0].mData;
unsigned short *idpointer = (unsigned short *)abl->mBuffers[1].mData;
// Skipping first sample
// where is isamp declared?
for (isamp = 1; isamp < abl->mBuffers[0].mDataByteSize; isamp++){
ipsamp = [NSNumber numberWithUnsignedShort:(unsigned
short)ippointer[isamp]];
[ipbuf addObject:ipsamp];
idsamp = [NSNumber numberWithUnsignedShort:(unsigned
short)idpointer[isamp]];
[idbuf addObject:idsamp];
}
-Jacob_______________________________________________
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