On the Echoaudio cards the sample rate is a global setting, so I need a way to prevent an app to change the rate if someone else already set it (the card han several devices/subdevices). I was thinking to put a simple "if (IsAudioOpen()) rate_min=rate_max=current_rate;" in pcm_open callback, but this solution is racy. Also what am I supposed to do about external clock ? I can't read its value and it teoretically can change at any moment.
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