Advice on audio file media protection?
Advice on audio file media protection?
- Subject: Advice on audio file media protection?
- From: Paul Reilly <email@hidden>
- Date: Tue, 24 Feb 2009 01:23:17 +0000
Hello,
I am fairly new to CoreAudio, but have my app playing some media files
in linear PCM (LEI16) format which are stored as .caf files on the iPhone. I am
basing my code of SpeakHere in the Apple sample library.
It's trivially easy, for anyone who buys/downloads the app, to strip the media
files from the bundle. So I want to implement some coding which modifies the
audio files, so they don't play. I was thinking of say editing the CAF
files, and modifying
the bytes at various positions before putting them in the Bundle. Then
my app would
know about this, and so could apply some function (shift left, add one
etc) to the bytes
it knows have been changed, and the Audio would play fine on the
iPhone, but not
if you copy them out.
So my question is how do I access specific bytes of the loaded sound file
from within AudioQueue Services?
Anybody got any pointers to set me off in the right direction?
Thanks
Paul
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