From 53cfbe9c7f6cf8bec217aeaa40a229e912a82269 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 30 Jan 2023 23:17:29 +0100
Subject: [PATCH] Add API to update port resampler

Previously resampler ratio could only set when creating
an audio port. This is in preparation for setting resampler
quality when the session rate mismatches.

The session's rate is only known after basic session-setup
is performed. At this time Click-IO already exists.
---
 libs/ardour/ardour/audio_port.h   | 2 +-
 libs/ardour/ardour/port.h         | 2 +-
 libs/ardour/ardour/port_manager.h | 5 +++--
 libs/ardour/audio_port.cc         | 9 ++++++++-
 libs/ardour/port_manager.cc       | 5 +++--
 5 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/libs/ardour/ardour/audio_port.h b/libs/ardour/ardour/audio_port.h
index 419d067d54..01b42d1a21 100644
--- a/libs/ardour/ardour/audio_port.h
+++ b/libs/ardour/ardour/audio_port.h
@@ -43,7 +43,7 @@ public:
 	void cycle_split ();
 
 	/* reset SRC, clear out any state */
-	void reinit ();
+	void reinit (bool with_ratio);
 
 	Buffer& get_buffer (pframes_t nframes) {
 		return get_audio_buffer (nframes);
diff --git a/libs/ardour/ardour/port.h b/libs/ardour/ardour/port.h
index ff35b1a550..a9fcd0f0ac 100644
--- a/libs/ardour/ardour/port.h
+++ b/libs/ardour/ardour/port.h
@@ -121,7 +121,7 @@ public:
 	virtual void cycle_start (pframes_t);
 	virtual void cycle_end (pframes_t) = 0;
 	virtual void cycle_split () = 0;
-	virtual void reinit () {}
+	virtual void reinit (bool) {}
 	virtual Buffer& get_buffer (pframes_t nframes) = 0;
 	virtual void flush_buffers (pframes_t /*nframes*/) {}
 	virtual void transport_stopped () {}
diff --git a/libs/ardour/ardour/port_manager.h b/libs/ardour/ardour/port_manager.h
index 4ebcd62a2d..0c83273ead 100644
--- a/libs/ardour/ardour/port_manager.h
+++ b/libs/ardour/ardour/port_manager.h
@@ -189,6 +189,9 @@ public:
 
 	void remove_all_ports ();
 
+	/** reset port-buffers. e.g. after freewheeling */
+	void reinit (bool with_ratio = false);
+
 	void clear_pending_port_deletions ();
 
 	virtual void add_pending_port_deletion (Port*) = 0;
@@ -303,8 +306,6 @@ protected:
 	 */
 	void cycle_end (pframes_t nframes, Session* s = 0);
 
-	void reinit ();
-
 	void cycle_end_fade_out (gain_t, gain_t, pframes_t, Session* s = 0);
 
 	static std::string port_info_file ();
diff --git a/libs/ardour/audio_port.cc b/libs/ardour/audio_port.cc
index 3dc3d4e970..1e6671ebb4 100644
--- a/libs/ardour/audio_port.cc
+++ b/libs/ardour/audio_port.cc
@@ -127,8 +127,15 @@ AudioPort::cycle_split ()
 }
 
 void
-AudioPort::reinit ()
+AudioPort::reinit (bool with_ratio)
 {
+	/* must not be called concurrently with processing */
+	if (with_ratio) {
+		/* Note: latency changes with quality, caller
+		 * must take care of updating port latencies */
+		_src.setup (resampler_quality ());
+		_src.set_rrfilt (10);
+	}
 	_src.reset ();
 }
 
diff --git a/libs/ardour/port_manager.cc b/libs/ardour/port_manager.cc
index 2f70c696e1..cb0a011eee 100644
--- a/libs/ardour/port_manager.cc
+++ b/libs/ardour/port_manager.cc
@@ -1316,11 +1316,12 @@ PortManager::silence (pframes_t nframes, Session* s)
 		}
 	}
 }
+
 void
-PortManager::reinit ()
+PortManager::reinit (bool with_ratio)
 {
 	for (auto const& p : *_ports.reader ()) {
-		p.second->reinit ();
+		p.second->reinit (with_ratio);
 	}
 }