I'm trying to extract the audio samples from an audio buffer returned
from the QuickTime Audio extraction API into a NSMutableArray of
NSNumbers.
The audio extraction API indicates that the samples are two byte
integers (unsigned short?) and the buffers are extracted without error.
2008-10-05 12:37:16.993 Roboplasm[2877:813] format flags = 41
2008-10-05 12:37:16.994 Roboplasm[2877:813] sample rate =
48000.000000
2008-10-05 12:37:16.996 Roboplasm[2877:813] bytes/packet = 4
2008-10-05 12:37:16.997 Roboplasm[2877:813] frames/packe = 1
2008-10-05 12:37:16.997 Roboplasm[2877:813] bytes/frame = 4
2008-10-05 12:37:16.997 Roboplasm[2877:813] channels/frame = 2
2008-10-05 12:37:16.998 Roboplasm[2877:813] bits/channel = 32
2008-10-05 12:37:17.000 Roboplasm[2877:813] format flags = 41
2008-10-05 12:37:17.000 Roboplasm[2877:813] sample rate =
48000.000000
2008-10-05 12:37:17.001 Roboplasm[2877:813] bytes/packet = 4
2008-10-05 12:37:17.001 Roboplasm[2877:813] frames/packet = 1
2008-10-05 12:37:17.002 Roboplasm[2877:813] bytes/frame = 4
2008-10-05 12:37:17.003 Roboplasm[2877:813] channels/frame = 2
2008-10-05 12:37:17.003 Roboplasm[2877:813] bits/channel = 32
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”.
isamp is 1.
Am I using the wrong data types?
thanks,
Joseph Ayers, Professor
Department of Biology and
Marine Science Center
Northeastern University
East Point, Nahant, MA 01908
Phone (781) 581-7370 x309(office), x335(lab)
Boston: 444 Richards Hall (617) 373-4044
Cellular (617) 755-7523, FAX: (781) 581-6076
eMail: [EMAIL PROTECTED]
http://www.neurotechnology.neu.edu/
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [EMAIL PROTECTED]
