SoundManager: Set up AVAudioSession on iOS

CMakeLists.txt

@@ -1544,6 +1544,7 @@ if(APPLE)
 
   if(IOS)
     target_sources(mixxx-lib PRIVATE
+      src/soundio/soundmanagerios.mm
       src/util/screensaverios.mm
     )
   else()

src/soundio/soundmanager.cpp

@@ -4,6 +4,7 @@
 
 #include <QLibrary>
 #include <QThread>
+#include <QtGlobal>
 #include <cstring> // for memcpy and strcmp
 
 #include "control/controlobject.h"
@@ -22,6 +23,10 @@
 #include "util/versionstore.h"
 #include "vinylcontrol/defs_vinylcontrol.h"
 
+#ifdef Q_OS_IOS
+#include "soundio/soundmanagerios.h"
+#endif
+
 typedef PaError (*SetJackClientName)(const char *name);
 
 namespace {
@@ -249,6 +254,9 @@ void SoundManager::queryDevicesPortaudio() {
     if (!m_paInitialized) {
 #ifdef Q_OS_LINUX
         setJACKName();
+#endif
+#ifdef Q_OS_IOS
+        mixxx::initializeAVAudioSession();
 #endif
         err = Pa_Initialize();
         m_paInitialized = true;

src/soundio/soundmanagerios.h

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace mixxx {
+
+void initializeAVAudioSession();
+
+}; // namespace mixxx

src/soundio/soundmanagerios.mm

@@ -0,0 +1,31 @@
+#include <QDebug>
+#include <QtGlobal>
+
+#import <AVFAudio/AVFAudio.h>
+
+namespace mixxx {
+
+void initializeAVAudioSession() {
+    AVAudioSession* session = AVAudioSession.sharedInstance;
+    AVAudioSessionCategory category = AVAudioSessionCategoryPlayback;
+    AVAudioSessionMode mode = AVAudioSessionModeDefault;
+    AVAudioSessionCategoryOptions options =
+            AVAudioSessionCategoryOptionMixWithOthers |
+            AVAudioSessionCategoryOptionAllowAirPlay |
+            AVAudioSessionCategoryOptionAllowBluetoothA2DP;
+
+    NSError* error = nil;
+    [session setCategory:category mode:mode options:options error:&error];
+    if (error != nil) {
+        qWarning() << "Could not initialize AVAudioSession:"
+                   << error.localizedDescription;
+    }
+
+    [session setActive:true error:&error];
+    if (error != nil) {
+        qWarning() << "Could not activate AVAudioSession:"
+                   << error.localizedDescription;
+    }
+}
+
+}; // namespace mixxx