Re: What is the AudioStreamBasicDescription(asbd) for a wav file

Subject: Re: What is the AudioStreamBasicDescription(asbd) for a wav file

From: "Paul Sanders" <email@hidden>

Date: Fri, 9 Jul 2010 22:58:40 +0100

Delivered-to: email@hidden

I think you should be using SInt16 rather than AudioUnitSampleType. Also, although it doesn't matter if you only ever run on Intel, omit kAudioFormatFlagsNativeEndian. Little-endian is the default and that's what you want here.

Something to get your head around if you are using Extended Audio File Services is that there are two data formats you need to specify. One is the format of the file you want to create, and that (I assume) is what we're discussing here. The other is the 'client data format' which specifies the format of samples you pass to ExtAudioFileWrite. This, within reason, can be anything you like. They can of course be the same, and from you're previous post that's probably what you want, but the nice thing is that they don't have to be.

HTH.

Regards,

Paul Sanders.

----- Original Message -----

From: Sanoj Nambi

To: Paul Sanders

Cc: tahome izwah ; email@hidden

Sent: Friday, July 09, 2010 9:16 PM

Subject: Re: What is the AudioStreamBasicDescription(asbd) for a wav file

I used

anASBD.mSampleRate = 44100.0;

anASBD.mFormatID = kAudioFormatLinearPCM;

anASBD.mFormatFlags = kAudioFormatFlagsAudioUnitCanonical;

anASBD.mBytesPerPacket = sizeof(AudioUnitSampleType)*2;

anASBD.mFramesPerPacket = 1;

anASBD.mBytesPerFrame = sizeof(AudioUnitSampleType)*2;

anASBD.mChannelsPerFrame = 2;

anASBD.mBitsPerChannel = 8 * sizeof(AudioUnitSampleType);

anASBD.mReserved = 0;

anASBD.mFormatFlags = kAudioFormatFlagIsSignedInteger |

kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked;

and it is creating a wav file.I can also see the size of the file is 5 MB.But I am unable to play.

I dont want to use some other framework unless i have no other option.

Regards,

Nambiar

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References:
	>What is the AudioStreamBasicDescription(asbd) for a wav file (From: Sanoj Nambi <email@hidden>)
	>Re: What is the AudioStreamBasicDescription(asbd) for a wav file (From: "Paul Sanders" <email@hidden>)
	>Re: What is the AudioStreamBasicDescription(asbd) for a wav file (From: tahome izwah <email@hidden>)
	>Re: What is the AudioStreamBasicDescription(asbd) for a wav file (From: "Paul Sanders" <email@hidden>)
	>Re: What is the AudioStreamBasicDescription(asbd) for a wav file (From: Sanoj Nambi <email@hidden>)