audioqueue: use the AudioSession API to overwrite the mute switch during media playback (iOS only)

modules/audio_output/audioqueue.c

@@ -31,6 +31,9 @@
 #import <vlc_plugin.h>
 #import <vlc_aout.h>
 #import <AudioToolBox/AudioQueue.h>
+#import <AudioToolBox/AudioSession.h>
+#import <TargetConditionals.h>
+
 #pragma mark -
 #pragma mark private declarations
 
@@ -62,6 +65,7 @@ set_subcategory(SUBCAT_AUDIO_AOUT)
 add_shortcut("audioqueue")
 set_callbacks(Open, Close)
 vlc_module_end ()
+
 #pragma mark -
 #pragma mark initialization
 
@@ -150,6 +154,19 @@ static int Start(audio_output_t *p_aout, audio_sample_format_t *restrict fmt)
     if (error != noErr)
         return VLC_EGENERIC;
 
+#ifdef TARGET_OS_IPHONE
+    // start audio session so playback continues if mute switch is on
+    AudioSessionInitialize (NULL,
+                            kCFRunLoopCommonModes,
+                            NULL,
+                            NULL);
+
+	// Set audio session to mediaplayback
+	UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
+	AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory),&sessionCategory);
+	AudioSessionSetActive(true);
+#endif
+
     p_aout->time_get = TimeGet;
     p_aout->play = Play;
     p_aout->pause = Pause;
@@ -160,6 +177,10 @@ static int Start(audio_output_t *p_aout, audio_sample_format_t *restrict fmt)
 
 static void Stop(audio_output_t *p_aout)
 {
+#ifdef TARGET_OS_IPHONE
+    AudioSessionSetActive(false);
+#endif
+
     p_aout->sys->i_played_length = 0;
     AudioQueueDisposeTimeline(p_aout->sys->audioQueueRef, p_aout->sys->timelineRef);
     AudioQueueStop(p_aout->sys->audioQueueRef, true);
@@ -203,10 +224,17 @@ static void Pause(audio_output_t *p_aout, bool pause, mtime_t date)
 {
     VLC_UNUSED(date);
 
-    if (pause)
+    if (pause) {
         AudioQueuePause(p_aout->sys->audioQueueRef);
-    else
+#ifdef TARGET_OS_IPHONE
+        AudioSessionSetActive(false);
+#endif
+    } else {
         AudioQueueStart(p_aout->sys->audioQueueRef, NULL);
+#ifdef TARGET_OS_IPHONE
+        AudioSessionSetActive(true);
+#endif
+    }
 }
 
 static void Flush(audio_output_t *p_aout, bool wait)