// get the cookie size
        UInt32 cookieSize;
        Boolean writable;
        err = AudioFileStreamGetPropertyInfo(inAudioFileStream, kAudioFileStreamProperty_MagicCookieData, &cookieSize, &writable);
        if (err) {
            PRINTERROR("info kAudioFileStreamProperty_MagicCookieData");
            return;
        }
        printf("cookieSize %d\n", (unsigned int)cookieSize);