win32_m.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "../stdafx.h"
00013 #include "../string_func.h"
00014 #include "win32_m.h"
00015 #include <windows.h>
00016 #include <mmsystem.h>
00017 
00018 static struct {
00019   bool stop_song;
00020   bool terminate;
00021   bool playing;
00022   int new_vol;
00023   HANDLE wait_obj;
00024   HANDLE thread;
00025   UINT_PTR devid;
00026   char start_song[MAX_PATH];
00027 } _midi;
00028 
00029 static FMusicDriver_Win32 iFMusicDriver_Win32;
00030 
00031 void MusicDriver_Win32::PlaySong(const char *filename)
00032 {
00033   assert(filename != NULL);
00034   strecpy(_midi.start_song, filename, lastof(_midi.start_song));
00035   _midi.playing = true;
00036   _midi.stop_song = false;
00037   SetEvent(_midi.wait_obj);
00038 }
00039 
00040 void MusicDriver_Win32::StopSong()
00041 {
00042   if (_midi.playing) {
00043     _midi.stop_song = true;
00044     _midi.start_song[0] = '\0';
00045     SetEvent(_midi.wait_obj);
00046   }
00047 }
00048 
00049 bool MusicDriver_Win32::IsSongPlaying()
00050 {
00051   return _midi.playing;
00052 }
00053 
00054 void MusicDriver_Win32::SetVolume(byte vol)
00055 {
00056   _midi.new_vol = vol;
00057   SetEvent(_midi.wait_obj);
00058 }
00059 
00060 static MCIERROR CDECL MidiSendCommand(const TCHAR *cmd, ...)
00061 {
00062   va_list va;
00063   TCHAR buf[512];
00064 
00065   va_start(va, cmd);
00066   _vsntprintf(buf, lengthof(buf), cmd, va);
00067   va_end(va);
00068   return mciSendString(buf, NULL, 0, 0);
00069 }
00070 
00071 static bool MidiIntPlaySong(const char *filename)
00072 {
00073   MidiSendCommand(_T("close all"));
00074 
00075   if (MidiSendCommand(_T("open \"%s\" type sequencer alias song"), OTTD2FS(filename)) != 0) {
00076     /* Let's try the "short name" */
00077     TCHAR buf[MAX_PATH];
00078     if (GetShortPathName(OTTD2FS(filename), buf, MAX_PATH) == 0) return false;
00079     if (MidiSendCommand(_T("open \"%s\" type sequencer alias song"), buf) != 0) return false;
00080   }
00081 
00082   MidiSendCommand(_T("seek song to start wait"));
00083   return MidiSendCommand(_T("play song")) == 0;
00084 }
00085 
00086 static void MidiIntStopSong()
00087 {
00088   MidiSendCommand(_T("close all"));
00089 }
00090 
00091 static void MidiIntSetVolume(int vol)
00092 {
00093   DWORD v = (vol * 65535 / 127);
00094   midiOutSetVolume((HMIDIOUT)_midi.devid, v + (v << 16));
00095 }
00096 
00097 static bool MidiIntIsSongPlaying()
00098 {
00099   char buf[16];
00100   mciSendStringA("status song mode", buf, sizeof(buf), 0);
00101   return strcmp(buf, "playing") == 0 || strcmp(buf, "seeking") == 0;
00102 }
00103 
00104 static DWORD WINAPI MidiThread(LPVOID arg)
00105 {
00106   do {
00107     char *s;
00108     int vol;
00109 
00110     vol = _midi.new_vol;
00111     if (vol != -1) {
00112       _midi.new_vol = -1;
00113       MidiIntSetVolume(vol);
00114     }
00115 
00116     s = _midi.start_song;
00117     if (s[0] != '\0') {
00118       _midi.playing = MidiIntPlaySong(s);
00119       s[0] = '\0';
00120 
00121       /* Delay somewhat in case we don't manage to play. */
00122       if (!_midi.playing) WaitForMultipleObjects(1, &_midi.wait_obj, FALSE, 5000);
00123     }
00124 
00125     if (_midi.stop_song && _midi.playing) {
00126       _midi.stop_song = false;
00127       _midi.playing = false;
00128       MidiIntStopSong();
00129     }
00130 
00131     if (_midi.playing && !MidiIntIsSongPlaying()) _midi.playing = false;
00132 
00133     WaitForMultipleObjects(1, &_midi.wait_obj, FALSE, 1000);
00134   } while (!_midi.terminate);
00135 
00136   MidiIntStopSong();
00137   return 0;
00138 }
00139 
00140 const char *MusicDriver_Win32::Start(const char * const *parm)
00141 {
00142   MIDIOUTCAPS midicaps;
00143   UINT nbdev;
00144   UINT_PTR dev;
00145   char buf[16];
00146 
00147   mciSendStringA("capability sequencer has audio", buf, lengthof(buf), 0);
00148   if (strcmp(buf, "true") != 0) return "MCI sequencer can't play audio";
00149 
00150   memset(&_midi, 0, sizeof(_midi));
00151   _midi.new_vol = -1;
00152 
00153   /* Get midi device */
00154   _midi.devid = MIDI_MAPPER;
00155   for (dev = 0, nbdev = midiOutGetNumDevs(); dev < nbdev; dev++) {
00156     if (midiOutGetDevCaps(dev, &midicaps, sizeof(midicaps)) == 0 && (midicaps.dwSupport & MIDICAPS_VOLUME)) {
00157       _midi.devid = dev;
00158       break;
00159     }
00160   }
00161 
00162   if (NULL == (_midi.wait_obj = CreateEvent(NULL, FALSE, FALSE, NULL))) return "Failed to create event";
00163 
00164   /* The lpThreadId parameter of CreateThread (the last parameter)
00165    * may NOT be NULL on Windows 95, 98 and ME. */
00166   DWORD threadId;
00167   if (NULL == (_midi.thread = CreateThread(NULL, 8192, MidiThread, 0, 0, &threadId))) return "Failed to create thread";
00168 
00169   return NULL;
00170 }
00171 
00172 void MusicDriver_Win32::Stop()
00173 {
00174   _midi.terminate = true;
00175   SetEvent(_midi.wait_obj);
00176   WaitForMultipleObjects(1, &_midi.thread, true, INFINITE);
00177   CloseHandle(_midi.wait_obj);
00178   CloseHandle(_midi.thread);
00179 }

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