Add musclist streaming support

Attempt Nr. 2 - Based on #548 and #501

+ Allows client to use a remote source as a last resort if the file can't be found locally.
+ Adds a check if the target file is missing.

This implementation assumed the streaming source to be structured like a webao content respository

include/aomusicplayer.h

@@ -25,7 +25,7 @@ public:
   int loop_end[4] = {0, 0, 0, 0};
 
 public slots:
-  void play(QString p_song, int channel = 0, bool loop = false,
+  int play(QString p_song, int channel = 0, bool loop = false,
             int effect_flags = 0);
   void stop(int channel = 0);
 

src/aomusicplayer.cpp

@@ -13,12 +13,12 @@ AOMusicPlayer::~AOMusicPlayer()
   }
 }
 
-void AOMusicPlayer::play(QString p_song, int channel, bool loop,
+int AOMusicPlayer::play(QString p_song, int channel, bool loop,
                          int effect_flags)
 {
   channel = channel % m_channelmax;
   if (channel < 0) // wtf?
-    return;
+    return BASS_ERROR_NOCHAN;
   QString f_path = ao_app->get_music_path(p_song);
 
   unsigned int flags = BASS_STREAM_PRESCAN | BASS_STREAM_AUTOFREE |
@@ -125,6 +125,7 @@ void AOMusicPlayer::play(QString p_song, int channel, bool loop,
 
   this->set_looping(loop, channel); // Have to do this here due to any
                                     // crossfading-related changes, etc.
+  return BASS_ErrorGetCode();
 }
 
 void AOMusicPlayer::stop(int channel)

src/courtroom.cpp

@@ -3824,6 +3824,11 @@ void Courtroom::handle_song(QStringList *p_contents)
       return;
   }
 
+  if(!file_exists(ao_app->get_sfx_suffix(ao_app->get_music_path(f_song))) && !f_song.startsWith("http")
+          && f_song != "~stop.mp3" && ao_app->asset_url != NULL) {
+      f_song = (ao_app->asset_url + "sounds/music/" + f_song).toLower();
+  }
+
   bool is_stop = (f_song == "~stop.mp3");
   if (n_char >= 0 && n_char < char_list.size()) {
     QString str_char = char_list.at(n_char).name;
@@ -3845,17 +3850,26 @@ void Courtroom::handle_song(QStringList *p_contents)
     }
   }
 
-  music_player->play(f_song, channel, looping, effect_flags);
+  int error_code = music_player->play(f_song, channel, looping, effect_flags);
+
   if (is_stop) {
     ui_music_name->setText(tr("None"));
+    return;
   }
-  else if (channel == 0) {
-    if (file_exists(ao_app->get_sfx_suffix(ao_app->get_music_path(f_song))) && !f_song.startsWith("http"))
-      ui_music_name->setText(f_song_clear);
-    else if (f_song.startsWith("http"))
-      ui_music_name->setText(tr("[STREAM] %1").arg(f_song_clear));
-    else
-      ui_music_name->setText(tr("[MISSING] %1").arg(f_song_clear));
+
+  if (error_code == BASS_ERROR_HANDLE) { // Cheap hack to see if file missing
+    ui_music_name->setText(tr("[MISSING] %1").arg(f_song_clear));
+    return;
+  }
+
+  if (f_song.startsWith("http") && channel == 0) {
+    ui_music_name->setText(tr("[STREAM] %1").arg(f_song_clear));
+    return;
+  }
+
+  if (channel == 0){
+    ui_music_name->setText(f_song_clear);
+    return;
   }
 }