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I ran across a very good doc from Apple by reading this list. I sent you the link... but it describes a "frame" as a single Byte. But in MY interpretation of a Frame is from the GSM Perspective. Which in this case is 130 bytes compressed, or 1280 bytes (640 16 bit values) uncompressed.
On Jan 9, 2008, at 11:42 AM, Mark Pauley wrote:
shtoomDescription.mFormatID = kAudioFormatLinearPCM;
shtoomDescription.mFormatFlags = kLinearPCMFormatFlagIsPacked | kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsBigEndian | kAudioFormatFlagIsNonInterleaved;
In addition to Michael's suggestions, I would suggest that you switch to using kLinearPCMFormatFlagIsNativeEndian... unless you're writing to a file of known endian-ness.
_Mark
i am taking in the data and using a gsm codec for which i have source code and doing a byte swap for the intel endian issue.
you see i am not using that shtoom description in my leopard code -- the current version of MTCoreAudio doesn't take the destination device as a parameter.
so, i am confused as to how to get 16bit output from MTConversionBuffer.
backing up a step -- i don't understand 'frames'. i am going to have to think a bit deeper to straighten this out.
John _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/coreaudio-api/email@hidden
| References: | |
| >Re: old mtcoreaudio code doesn't work now (From: dudley ackerman <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: Michael Thornburgh <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: dudley ackerman <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: Michael Thornburgh <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: Michael Thornburgh <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: dudley ackerman <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: dudley ackerman <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: Michael Thornburgh <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: dudley ackerman <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: Mark Pauley <email@hidden>) | |
| >Re: old mtcoreaudio code doesn't work now (From: dudley ackerman <email@hidden>) |
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