move audio unit initialization after audio session initialization and setup...

move audio unit initialization after audio session initialization and setup fixes issues when trying to start playback from background
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>
(cherry picked from commit 1ee464915748e9efb00464d2e926c27e1513a4bd)

modules/audio_output/audiounit_ios.c

@@ -252,13 +252,6 @@ static int StartAnalog(audio_output_t *p_aout, audio_sample_format_t *fmt)
         return false;
     }
 
-    /* AU init */
-    status = AudioUnitInitialize(p_sys->au_unit);
-    if (status != noErr) {
-        msg_Err(p_aout, "failed to init AudioUnit (%i)", (int)status);
-        return false;
-    }
-
     /* setup circular buffer */
     TPCircularBufferInit(&p_sys->circular_buffer, AUDIO_BUFFER_SIZE_IN_SECONDS * fmt->i_rate * fmt->i_bytes_per_frame);
 
@@ -273,6 +266,13 @@ static int StartAnalog(audio_output_t *p_aout, audio_sample_format_t *fmt)
     AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory),&sessionCategory);
     AudioSessionSetActive(true);
 
+    /* AU init */
+    status = AudioUnitInitialize(p_sys->au_unit);
+    if (status != noErr) {
+        msg_Err(p_aout, "failed to init AudioUnit (%i)", (int)status);
+        return false;
+    }
+
     /* start the unit */
     status = AudioOutputUnitStart(p_sys->au_unit);
     msg_Dbg(p_aout, "audio output unit started: %i", (int)status);