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Re: Using AudioConverter

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Re: Using AudioConverter

Subject: Re: Using AudioConverter
From: Doug Wyatt <email@hidden>
Date: Sun, 17 Oct 2004 13:41:47 -0700

On Oct 16, 2004, at 6:06, Patrick Machielse wrote:

    //
    //  convert the buffer (fails with error -50)
    //
    UInt32 outSize = 0;
    err = AudioConverterConvertBuffer(conv,
                                      inBufSize,
                                      (void*)inBuf,
                                      &outSize,
                                      (void*)outBuf);

-50 is paramErr, a standard MacOS error code, indicating that a function was passed an invalid parameter value. The fourth parameter is "ioOutputDataSize". The "io" prefix indicates that the value is significant both on entry and exit from the function. On entry it is the size of the output buffer in bytes. On exit it is the number of bytes written into the output buffer. AudioConverterConvertBuffer is returning paramErr because *ioOutputDataSize is 0 on entry. Change it to be the real size of the buffer in bytes.

hth,
Doug

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