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Re: Render callback disappearing (QT 7.0)

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Re: Render callback disappearing (QT 7.0)

Subject: Re: Render callback disappearing (QT 7.0)
From: Dominic Feira <email@hidden>
Date: Thu, 12 May 2005 13:30:52 -0400

With some help from William Stewart the problem was identified and fixed. I just wanted to post the reason/fix so its in the archives in case somebody else has the same problem.

Basically, I wasn't handling the timestamp properly. The corrrect way to manually pump data is listed below. I was simply passing in an uninitialized timestamp and not incrementing mSampleTime. Oops.

AudioTimeStamp stamp; memset(&stamp, 0, sizeof(stamp)); /* crucial or you get garbage */ stamp.mFlags = kAudioTimeStampSampleTimeValid; /* crucial */

while(true)
{
    frames = 512;
    AudioUnitRender(mOutputUnit,
                                      &flags,
                                      &stamp,
                                      0,
                                      frames,
                                      mBufferList);

    stamp.mSampleTime += frames;    /* crucial */
}

Thanks to all who gave ideas and feedback.

Dominic Feira / Code Monkey / Ambrosia Software, Inc.
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