add interface for latency updates w/o restarting the backend
This is useful for USB devices. Since there is a ringbuffer in the driver (common on ALSA but also other platforms) to align the USB stream with USB bus timing the latency can differ every time the device is re-opened.
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@ -350,6 +350,11 @@ class LIBARDOUR_API AudioBackend : public PortEngine {
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*/
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*/
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virtual bool can_change_buffer_size_when_running () const = 0;
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virtual bool can_change_buffer_size_when_running () const = 0;
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/** return true if the backend can measure and update
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* systemic latencies without restart.
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*/
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virtual bool can_change_systemic_latency_when_running () const { return false; }
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/* Set the hardware parameters.
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/* Set the hardware parameters.
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*
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*
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* If called when the current state is stopped or paused,
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* If called when the current state is stopped or paused,
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