Initial attempt for get/set song position

* Declared I_SetSongPosition, I_GetSongPosition
* Implemented S_PositionMusic and S_GetPositionMusic
* Exposed in console TUNES and lua
* Implemented set position in SDL, SDL12, WIN32
* Implemented get position in WIN32

# Conflicts:
#	src/nds/i_sound.c
#	src/sdl12/mixer_sound.c
#	src/sdl12/sdl_sound.c
#	src/win32ce/win_snd.c

src/android/i_sound.c

@@ -142,3 +142,14 @@ boolean I_SetSongSpeed(float speed)
         (void)speed;
         return false;
 }
+
+boolean I_SetSongPosition(float position)
+{
+        (void)position;
+        return false;
+}
+
+float I_GetSongPosition(void)
+{
+        return 0.0f;
+}

src/djgppdos/i_sound.c

@@ -549,3 +549,14 @@ boolean I_SetSongSpeed(float speed)
 	(void)speed;
 	return false;
 }
+
+boolean I_SetSongPosition(float position)
+{
+    (void)position;
+    return false;
+}
+
+float I_GetSongPosition(void)
+{
+    return 0.0f;
+}

src/dummy/i_sound.c

@@ -145,3 +145,14 @@ boolean I_SetSongTrack(int track)
 	(void)track;
 	return false;
 }
+
+boolean I_SetSongPosition(float position)
+{
+    (void)position;
+    return false;
+}
+
+float I_GetSongPosition(void)
+{
+    return 0.0f;
+}

src/i_sound.h

@@ -206,6 +206,10 @@ void I_ShutdownDigMusic(void);
 
 boolean I_SetSongSpeed(float speed);
 
+boolean I_SetSongPosition(float position);
+
+float I_GetSongPosition(void);
+
 boolean I_SetSongTrack(INT32 track);
 
 /**	\brief The I_StartDigSong function

src/s_sound.c

@@ -1404,6 +1404,16 @@ boolean S_SpeedMusic(float speed)
 	return I_SetSongSpeed(speed);
 }
 
+boolean S_PositionMusic(float position)
+{
+	return I_SetSongPosition(position);
+}
+
+float S_GetPositionMusic(void)
+{
+	return I_GetSongPosition();
+}
+
 void S_StopMusic(void)
 {
 	if (!music_playing)

src/s_sound.h

@@ -135,6 +135,12 @@ void S_ChangeMusic(const char *mmusic, UINT16 mflags, boolean looping);
 // Set Speed of Music
 boolean S_SpeedMusic(float speed);
 
+// Set Position of Music
+boolean S_PositionMusic(float position);
+
+// Get Position of Music
+float S_GetPositionMusic(void);
+
 // Stops the music.
 void S_StopMusic(void);
 

src/sdl/mixer_sound.c

@@ -736,6 +736,23 @@ boolean I_SetSongSpeed(float speed)
 	return false;
 }
 
+boolean I_SetSongPosition(float position)
+{
+	if (position > 0.0f) 
+	{
+		Mix_RewindMusic(); // needed for MP3
+		Mix_SetMusicPosition(position);
+		return true;
+	}
+	(void)position;
+	return false;
+}
+
+float I_GetSongPosition(void)
+{
+	return 0.0f;
+}
+
 boolean I_SetSongTrack(int track)
 {
 #ifdef HAVE_LIBGME

src/sdl/sdl_sound.c

@@ -1973,6 +1973,17 @@ boolean I_SetSongSpeed(float speed)
 	return false;
 }
 
+boolean I_SetSongPosition(float position)
+{
+	(void)position;
+	return false;
+}
+
+float I_GetSongPosition(void)
+{
+	return 0.0f;
+}
+
 boolean I_SetSongTrack(int track)
 {
 	(void)track;

src/win32/win_snd.c

@@ -756,6 +756,40 @@ boolean I_SetSongSpeed(float speed)
 	return true;
 }
 
+boolean I_SetSongPosition(float position)
+{
+	if(position > 0.0f) 
+	{
+		FMOD_RESULT e;
+		position *= 1000.0f;
+		e = FMOD_Channel_SetPosition(music_channel, (UINT32)position, FMOD_TIMEUNIT_MS);
+		if (e == FMOD_OK)
+			return true;
+		else if (e == FMOD_ERR_UNSUPPORTED // Only music modules, numbnuts!
+				|| e == FMOD_ERR_INVALID_POSITION) // Out-of-bounds!
+			return false;
+		else // Congrats, you horribly broke it somehow
+		{
+			FMR_MUSIC(e);
+			return false;
+		}
+		
+	}
+	(void)position;
+	return false;
+}
+
+float I_GetSongPosition(void)
+{
+	FMOD_RESULT e;
+	UINT32 fmposition = 0.0;
+	e = FMOD_Channel_GetPosition(music_channel, &fmposition, FMOD_TIMEUNIT_MS);
+	if (e == FMOD_OK)
+		return fmposition / 1000.0f;
+	else
+		return 0.0f;
+}
+
 boolean I_SetSongTrack(INT32 track)
 {
 	if (track != current_track) // If the track's already playing, then why bother?