Fix Jack latency recomputation when plugin latency changes

Paul Davis says "jack_recompute_total_latencies() is a server call. It is not
legal to make server calls from within a server callback (like the process
callback)."

1 files changed, 11 insertions, 0 deletions

diff --git a/src/comm.h b/src/comm.h
index e4579eb..11d7dc3 100644
--- a/src/comm.h
+++ b/src/comm.h
@@ -22,6 +22,7 @@ typedef enum {
   NO_MESSAGE,          ///< Sentinel type for uninitialized messages
   CONTROL_PORT_CHANGE, ///< Value change for a control port (float)
   EVENT_TRANSFER,      ///< Event transfer for a sequence port (atom)
+  LATENCY_CHANGE,      ///< Change to plugin latency
 } JalvMessageType;
 
 /**
@@ -59,6 +60,16 @@ typedef struct {
 } JalvEventTransfer;
 
 /**
+   The payload of a LATENCY_CHANGE message.
+
+   This message has a fixed sized, and is described in its entirety by this
+   struct.
+*/
+typedef struct {
+  float value; ///< Latency in frames at the current sample rate
+} JalvLatencyChange;
+
+/**
    Write a message in two parts to a ring.
 
    This is used to conveniently write a message with a fixed-size header and