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win midi: Proper pause/resume

--- a/src/i_sdlmusic.c

+++ b/src/i_sdlmusic.c

@@ -341,9 +341,13 @@

         return;

     }

+#if defined(_WIN32)

+    I_WIN_PauseSong();

+#else

     musicpaused = true;

     UpdateMusicVolume();

+#endif

 }

 static void I_SDL_ResumeSong(void)

@@ -353,9 +357,13 @@

         return;

     }

+#if defined(_WIN32)

+    I_WIN_ResumeSong();

+#else

     musicpaused = false;

     UpdateMusicVolume();

+#endif

 }

 static void I_SDL_StopSong(void)

--- a/src/i_winmusic.c

+++ b/src/i_winmusic.c

@@ -444,6 +444,28 @@

     UpdateVolume();

 }

+void I_WIN_PauseSong(void)

+{

+    MMRESULT mmr;

+

+    mmr = midiStreamPause(hMidiStream);

+    if (mmr != MMSYSERR_NOERROR)

+    {

+        MidiErrorMessageBox(mmr);

+    }

+}

+

+void I_WIN_ResumeSong(void)

+{

+    MMRESULT mmr;

+

+    mmr = midiStreamRestart(hMidiStream);

+    if (mmr != MMSYSERR_NOERROR)

+    {

+        MidiErrorMessageBox(mmr);

+    }

+}

+

 boolean I_WIN_RegisterSong(char *filename)

 {

     int i;

@@ -517,6 +539,7 @@

     MMRESULT mmr;

     I_WIN_StopSong();

+    I_WIN_UnRegisterSong();

     mmr = midiOutUnprepareHeader((HMIDIOUT)hMidiStream, hdr, sizeof(MIDIHDR));

     if (mmr != MMSYSERR_NOERROR)

--- a/src/i_winmusic.h

+++ b/src/i_winmusic.h

@@ -23,6 +23,8 @@

 boolean I_WIN_InitMusic(void);

 void I_WIN_PlaySong(boolean looping);

+void I_WIN_PauseSong(void);

+void I_WIN_ResumeSong(void);

 void I_WIN_StopSong(void);

 void I_WIN_SetMusicVolume(int volume);

 boolean I_WIN_RegisterSong(char* filename);