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Re: Help Please - failure in creating audio file.
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Re: Help Please - failure in creating audio file.


  • Subject: Re: Help Please - failure in creating audio file.
  • From: tahome izwah <email@hidden>
  • Date: Fri, 15 Jan 2010 07:21:58 +0100

I found the DIRAC2 example project on Stephan Bernsee's web site very
helpful - it has code to read from and write to sound files using the
ExtAudioFile API in his example iPhone project that comes with his
free time stretching library:

http://www.dspdimension.com/technology-licensing/dirac2/

(click the "get Dirac LE" button). The files you will want are called
EAFRead.mm and EAFWrite.mm in the iPhone/Classes folder

HTH
--th


2010/1/15 wm schauweker <email@hidden>:
> I would be most grateful for any guidance anyone could offer.
>
> o On iPhone, using SDK 3.1.2, testing in emulator.
> o I am trying to use Core Audio to create a file from audio sample data.
> oThis is in the nature of an "export" routine - exporting audio data that
> was originally taken from an Audio Unit and stashed in a "sample" file.
> o Now, I want to read the sample file and convert to .wav format.
>
> After much hacking I have the following working to the point that I can
> create an AudioConverter. However the CreatAudioFile function is failing
> with a fmt? error. (I had the whole copy sequence working earlier, but the
> the formats were bogus - I specified only one channel, but the sample file
> format is two-channel mono - buffer of sound, buffer of silence, ... .)
>
> Here are the ASBDs I am defining, and a snippet of the code in question:
>
>         // Specify sample format. (AudioUnit input samples - 8.24
> uninterleaved, 2 channels)
>         inputFormat.mSampleRate = 44100.0;
>         inputFormat.mFormatID = kAudioFormatLinearPCM;
>         inputFormat.mFramesPerPacket = 1;
>         inputFormat.mChannelsPerFrame = 2;
>         inputFormat.mBytesPerFrame = 4;
>         inputFormat.mBytesPerPacket = 4;
>         inputFormat.mBitsPerChannel = 32;
>         inputFormat.mReserved = 0;
>         inputFormat.mFormatFlags =
>         kLinearPCMFormatFlagIsSignedInteger |
>         kLinearPCMFormatFlagIsPacked |
>         kAudioFormatFlagIsNonInterleaved;
>
>         // Specify output recording format. (16-bit samples,
> noninterleaved.)
>         outputFormat.mSampleRate = 44100.0;
>         outputFormat.mFormatID = kAudioFormatLinearPCM;
>         outputFormat.mFramesPerPacket = 1;
>         outputFormat.mChannelsPerFrame = 2;
>         outputFormat.mBytesPerFrame = 2;
>         outputFormat.mBytesPerPacket = 2;
>         outputFormat.mBitsPerChannel = 16;
>         outputFormat.mReserved = 0;
>         outputFormat.mFormatFlags =
>         kLinearPCMFormatFlagIsSignedInteger |
>         kLinearPCMFormatFlagIsPacked |
>         kAudioFormatFlagIsNonInterleaved;
>
>
>         // Create AudioConverter
>         XThrowIfError(AudioConverterNew(&inputFormat, &outputFormat,
> &converter), "Exporter: Error creating AudioConverter");
>
>         // Open output file.
>         CFURLRef exportURL = CFURLCreateFromFileSystemRepresentation(NULL,
> (UInt8*)exportPath_, strlen(exportPath_), false);
> /** This is the call that is failing **/
>         XThrowIfError(AudioFileCreateWithURL(exportURL,
>                                                kAudioFileWAVEType,
>                                                &outputFormat,
>                                                kAudioFileFlags_EraseFile,
>                                                &outputFile), "Exporter:
> Error opening export output file");
>
>
>
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References: 
 >Help Please - failure in creating audio file. (From: wm schauweker <email@hidden>)

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