From a2ffd4611b5325d9dccb7887206660a39ce8efaf Mon Sep 17 00:00:00 2001
From: Stefano D'Angelo <zanga.mail@gmail.com>
Date: Thu, 11 Apr 2024 10:44:27 +0200
Subject: [PATCH] tentative ios fix background audio pause/resume

---
 templates/ios/src/app-Bridging-Header.h |  2 ++
 templates/ios/src/app.swift             |  6 +++++
 templates/ios/src/native.mm             | 30 +++++++++++++++++++++----
 3 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/templates/ios/src/app-Bridging-Header.h b/templates/ios/src/app-Bridging-Header.h
index e232263..0e78a53 100644
--- a/templates/ios/src/app-Bridging-Header.h
+++ b/templates/ios/src/app-Bridging-Header.h
@@ -20,5 +20,7 @@
 
 char audioStart();
 void audioStop();
+void audioPause();
+void audioResume();
 void setParameter(int i, float v);
 float getParameter(int i);
diff --git a/templates/ios/src/app.swift b/templates/ios/src/app.swift
index a71bed9..d92db0c 100644
--- a/templates/ios/src/app.swift
+++ b/templates/ios/src/app.swift
@@ -97,6 +97,12 @@ struct templateApp: App {
 	var body: some Scene {
 		WindowGroup {
 			ContentView()
+                        .onReceive(NotificationCenter.default.publisher(for: UIApplication.didEnterBackgroundNotification)) { _ in
+                            audioPause()
+                        }
+                        .onReceive(NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification)) { _ in
+                            audioResume()
+                        }
 		}
 	}
 }
diff --git a/templates/ios/src/native.mm b/templates/ios/src/native.mm
index 5a1c570..779b058 100644
--- a/templates/ios/src/native.mm
+++ b/templates/ios/src/native.mm
@@ -36,6 +36,8 @@
 #define BLOCK_SIZE  32
 
 static ma_device	device;
+static ma_device_config	deviceConfig;
+char			device_inited = 0;
 static plugin		instance;
 static void *		mem;
 #if NUM_NON_OPT_CHANNELS_IN > NUM_CHANNELS_IN
@@ -189,14 +191,14 @@ extern "C"
 char audioStart() {
 #if NUM_CHANNELS_IN + NUM_CHANNELS_OUT > 0
 # if NUM_CHANNELS_IN == 0
-	ma_device_config deviceConfig = ma_device_config_init(ma_device_type_playback);
+	deviceConfig = ma_device_config_init(ma_device_type_playback);
 # elif NUM_CHANNELS_OUT == 0
-	ma_device_config deviceConfig = ma_device_config_init(ma_device_type_capture);
+	deviceConfig = ma_device_config_init(ma_device_type_capture);
 # else
-	ma_device_config deviceConfig = ma_device_config_init(ma_device_type_duplex);
+	deviceConfig = ma_device_config_init(ma_device_type_duplex);
 # endif
 #else
-	ma_device_config deviceConfig = ma_device_config_init(ma_device_type_playback);
+	deviceConfig = ma_device_config_init(ma_device_type_playback);
 #endif
 
 	deviceConfig.periodSizeInFrames		= BLOCK_SIZE;
@@ -328,6 +330,9 @@ char audioStart() {
 		ma_device_uninit(&device);
 		return false;
 	}
+
+	device_inited = 1;
+
 	return true;
 }
 
@@ -341,6 +346,23 @@ void audioStop() {
 	// No need to close MIDI connections (e.g. via MIDIClientDispose), the system terminates them when the app terminates.
 }
 
+extern "C"
+void audioPause() {
+	if (device_inited) {
+		ma_device_stop(&device);
+		ma_device_uninit(&device);
+	}
+}
+
+extern "C"
+void audioResume() {
+	// TODO: couldn't this could fail?...
+	if (device_inited) {
+		ma_device_init(NULL, &deviceConfig, &device);
+		ma_device_start(&device);
+	}
+}
+
 extern "C"
 float getParameter(int i) {
 #if PARAMETERS_N > 0