Apple

On Wed, Sep 24, 2008 at 8:52 PM, Craig Hopson <email@hidden> wrote:

This returns 1885696621, which I don't know how to interpret. :-(

In hex this is: 0x7065726D
In ASCII this is: 'perm'

Looks like you are getting file permission error. Do you have the file open for writes, or read only?

-Craig

On Sep 24, 2008, at 12:32 PM, Rico Hauke wrote:

Hi list,

I am trying to decode a mp3 file to lpcm but ExtAudioFileSetProperty() fails when trying to set the client format.

Here's the code:

status = ExtAudioFileGetProperty(file, kExtAudioFileProperty_FileDataFormat, &size, &format);

This returns kAudioServicesNoError (== 0) and format was filled with the following values:

format.mSampleRate: 44100.0
format.mFormatID: 778924083 (== 'mp3@')
format.mFormatFlags: 0
format.mBytesPerPacket: 0
format.mFramesPerPacket: 1152
format.mBytesPerFrame: 0
format.mChannelsPerFrame: 2
format.mBitsPerChannel: 0
format.mReserved: 0

Next, I set the client format:

clientFormat = format;
clientFormat.mSampleRate = 44100.0;
clientFormat.mFormatID = 'lpcm';
clientFormat.mFormatFlags = 0;
clientFormat.mBytesPerPacket = 4;
clientFormat.mFramesPerPacket = 1;
clientFormat.mBytesPerFrame = 4;
clientFormat.mChannelsPerFrame = 2;
clientFormat.mBitsPerChannel = 16;
clientFormat.mReserved = 0;

UInt32 clientSize = sizeof(clientFormat);

status = ExtAudioFileSetProperty(file, kExtAudioFileProperty_ClientDataFormat, clientSize, &clientFormat);

This returns 1885696621, which I don't know how to interpret. :-(

So what am I doing wrong?
Would this code work on that mobile platform?

Thanks,
Rico

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References:
	>ExtAudioFileSetProperty() fails (From: "Rico Hauke" <email@hidden>)
	>Re: ExtAudioFileSetProperty() fails (From: Craig Hopson <email@hidden>)
	>Re: ExtAudioFileSetProperty() fails (From: "Rico Hauke" <email@hidden>)