Add S_MidiPlaying and S_MusicPlaying via I_MIDIPlaying and I_MusicPlaying

# Conflicts:
#	src/sdl12/mixer_sound.c

src/i_sound.h

@@ -132,6 +132,18 @@ void I_PauseSong(INT32 handle);
 */
 void I_ResumeSong(INT32 handle);
 
+/**	\brief Get MIDI music status
+
+	\return boolean
+*/
+boolean I_MIDIPlaying(void);
+
+/**	\brief Get general music status
+
+	\return boolean
+*/
+boolean I_MusicPlaying(void);
+
 //
 //  MIDI I/O
 //

src/s_sound.c

@@ -1575,3 +1575,13 @@ void S_ResumeAudio(void)
 	// resume cd music
 	I_ResumeCD();
 }
+
+boolean S_MIDIPlaying(void)
+{
+	return I_MIDIPlaying();
+}
+
+boolean S_MusicPlaying(void)
+{
+	return I_MusicPlaying();
+}

src/s_sound.h

@@ -148,6 +148,12 @@ void S_StopMusic(void);
 void S_PauseAudio(void);
 void S_ResumeAudio(void);
 
+// Gets MIDI music status
+boolean S_MIDIPlaying(void);
+
+// Gets general music status
+boolean S_MusicPlaying(void);
+
 //
 // Updates music & sounds
 //

src/sdl/mixer_sound.c

@@ -497,6 +497,16 @@ void I_ResumeSong(INT32 handle)
 	songpaused = false;
 }
 
+boolean I_MIDIPlaying(void)
+{
+	return midimode && music;
+}
+
+boolean I_MusicPlaying(void)
+{
+	return (boolean)music;
+}
+
 //
 // Digital Music
 //

src/win32/win_snd.c

@@ -468,6 +468,16 @@ void I_ResumeSong(INT32 handle)
 		FMR_MUSIC(FMOD_Channel_SetPaused(music_channel, false));
 }
 
+boolean I_MIDIPlaying(void)
+{
+	return midimode && music_stream;
+}
+
+boolean I_MusicPlaying(void)
+{
+	return (boolean)music_stream;
+}
+
 void I_InitDigMusic(void)
 {
 }