# win32_m.cpp

Go to the documentation of this file.

    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 "win32_m.h"
    00014 #include <windows.h>
    00015 #include <mmsystem.h>
    00016
    00017 static struct {
    00018   bool stop_song;
    00019   bool terminate;
    00020   bool playing;
    00021   int new_vol;
    00022   HANDLE wait_obj;
    00023   HANDLE thread;
    00024   UINT_PTR devid;
    00025   char start_song[MAX_PATH];
    00026 } _midi;
    00027
    00028 static FMusicDriver_Win32 iFMusicDriver_Win32;
    00029
    00030 void MusicDriver_Win32::PlaySong(const char *filename)
    00031 {
    00032   assert(filename != NULL);
    00033   strecpy(_midi.start_song, filename, lastof(_midi.start_song));
    00034   _midi.playing = true;
    00035   _midi.stop_song = false;
    00036   SetEvent(_midi.wait_obj);
    00037 }
    00038
    00039 void MusicDriver_Win32::StopSong()
    00040 {
    00041   if (_midi.playing) {
    00042     _midi.stop_song = true;
    00043     _midi.start_song[0] = '\0';
    00044     SetEvent(_midi.wait_obj);
    00045   }
    00046 }
    00047
    00048 bool MusicDriver_Win32::IsSongPlaying()
    00049 {
    00050   return _midi.playing;
    00051 }
    00052
    00053 void MusicDriver_Win32::SetVolume(byte vol)
    00054 {
    00055   _midi.new_vol = vol;
    00056   SetEvent(_midi.wait_obj);
    00057 }
    00058
    00059 static MCIERROR CDECL MidiSendCommand(const TCHAR *cmd, ...)
    00060 {
    00061   va_list va;
    00062   TCHAR buf[512];
    00063
    00064   va_start(va, cmd);
    00065   _vsntprintf(buf, lengthof(buf), cmd, va);
    00066   va_end(va);
    00067   return mciSendString(buf, NULL, 0, 0);
    00068 }
    00069
    00070 static bool MidiIntPlaySong(const char *filename)
    00071 {
    00072   MidiSendCommand(_T("close all"));
    00073
    00074   if (MidiSendCommand(_T("open \"%s\" type sequencer alias song"), OTTD2FS(filename)) != 0) {
    00075     /* Let's try the "short name" */
    00076     TCHAR buf[MAX_PATH];
    00077     if (GetShortPathName(OTTD2FS(filename), buf, MAX_PATH) == 0) return false;
    00078     if (MidiSendCommand(_T("open \"%s\" type sequencer alias song"), buf) != 0) return false;
    00079   }
    00080
    00081   return MidiSendCommand(_T("play song from 0")) == 0;
    00082 }
    00083
    00084 static void MidiIntStopSong()
    00085 {
    00086   MidiSendCommand(_T("close all"));
    00087 }
    00088
    00089 static void MidiIntSetVolume(int vol)
    00090 {
    00091   DWORD v = (vol * 65535 / 127);
    00092   midiOutSetVolume((HMIDIOUT)_midi.devid, v + (v << 16));
    00093 }
    00094
    00095 static bool MidiIntIsSongPlaying()
    00096 {
    00097   char buf[16];
    00098   mciSendStringA("status song mode", buf, sizeof(buf), 0);
    00099   return strcmp(buf, "playing") == 0 || strcmp(buf, "seeking") == 0;
    00100 }
    00101
    00102 static DWORD WINAPI MidiThread(LPVOID arg)
    00103 {
    00104   do {
    00105     char *s;
    00106     int vol;
    00107
    00108     vol = _midi.new_vol;
    00109     if (vol != -1) {
    00110       _midi.new_vol = -1;
    00111       MidiIntSetVolume(vol);
    00112     }
    00113
    00114     s = _midi.start_song;
    00115     if (s[0] != '\0') {
    00116       _midi.playing = MidiIntPlaySong(s);
    00117       s[0] = '\0';
    00118
    00119       /* Delay somewhat in case we don't manage to play. */
    00120       if (!_midi.playing) WaitForMultipleObjects(1, &_midi.wait_obj, FALSE, 5000);
    00121     }
    00122
    00123     if (_midi.stop_song && _midi.playing) {
    00124       _midi.stop_song = false;
    00125       _midi.playing = false;
    00126       MidiIntStopSong();
    00127     }
    00128
    00129     if (_midi.playing && !MidiIntIsSongPlaying()) _midi.playing = false;
    00130
    00131     WaitForMultipleObjects(1, &_midi.wait_obj, FALSE, 1000);
    00132   } while (!_midi.terminate);
    00133
    00134   MidiIntStopSong();
    00135   return 0;
    00136 }
    00137
    00138 const char *MusicDriver_Win32::Start(const char * const *parm)
    00139 {
    00140   MIDIOUTCAPS midicaps;
    00141   UINT nbdev;
    00142   UINT_PTR dev;
    00143   char buf[16];
    00144
    00145   mciSendStringA("capability sequencer has audio", buf, lengthof(buf), 0);
    00146   if (strcmp(buf, "true") != 0) return "MCI sequencer can't play audio";
    00147
    00148   memset(&_midi, 0, sizeof(_midi));
    00149   _midi.new_vol = -1;
    00150
    00151   /* Get midi device */
    00152   _midi.devid = MIDI_MAPPER;
    00153   for (dev = 0, nbdev = midiOutGetNumDevs(); dev < nbdev; dev++) {
    00154     if (midiOutGetDevCaps(dev, &midicaps, sizeof(midicaps)) == 0 && (midicaps.dwSupport & MIDICAPS_VOLUME)) {
    00155       _midi.devid = dev;
    00156       break;
    00157     }
    00158   }
    00159
    00160   if (NULL == (_midi.wait_obj = CreateEvent(NULL, FALSE, FALSE, NULL))) return "Failed to create event";
    00161
    00162   /* The lpThreadId parameter of CreateThread (the last parameter)
    00163    * may NOT be NULL on Windows 95, 98 and ME. */
    00164   DWORD threadId;
    00165   if (NULL == (_midi.thread = CreateThread(NULL, 8192, MidiThread, 0, 0, &threadId))) return "Failed to create thread";
    00166
    00167   return NULL;
    00168 }
    00169
    00170 void MusicDriver_Win32::Stop()
    00171 {
    00172   _midi.terminate = true;
    00173   SetEvent(_midi.wait_obj);
    00174   WaitForMultipleObjects(1, &_midi.thread, true, INFINITE);
    00175   CloseHandle(_midi.wait_obj);
    00176   CloseHandle(_midi.thread);
    00177 }