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Editorial Team
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Asked: 2026-05-17T20:13:58+00:00

I record audio in .caf format and later need to convert it to .wav

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I record audio in .caf format and later need to convert it to .wav in order to send the file as a email attachment. How can I convert the file to wav format in iOS 3.1.x?

The format of the audio:

[NSNumber numberWithInt:kAudioFormatLinearPCM], AVFormatIDKey,
[NSNumber numberWithFloat:11025.0f],            AVSampleRateKey,
[NSNumber numberWithInt:1],                     AVNumberOfChannelsKey,
[NSNumber numberWithInt:16],                    AVLinearPCMBitDepthKey,
[NSNumber numberWithBool:YES],                  AVLinearPCMIsBigEndianKey,
[NSNumber numberWithBool:NO],                   AVLinearPCMIsFloatKey,

I am not tied to this format, I just need to be able to record and playback on the device and email a wav version file.

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1 Answer

  1. Editorial Team

    The answer is simple, just init with a .wav extension.

    The answer was provided by Paul Bruneau on the Apple Developer forum:

    From the class reference docs, the recorder infers the file type from the extension that you choose. So try .aiff or .aif or .wav

    initWithURL:settings:error:
    Initializes and returns an audio recorder.

    - (id)initWithURL:(NSURL *)url
settings:(NSDictionary *)settings
error:(NSError **)outError

    Parameters: url

    The file system location to record to. The file type to record to is inferred from the file extension included in this parameter’s value.

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