extmidi.cpp

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00001 /* $Id: extmidi.cpp 18809 2010-01-15 16:41:15Z rubidium $ */
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 #ifndef __MORPHOS__
00013 #include "../stdafx.h"
00014 #include "../debug.h"
00015 #include "../string_func.h"
00016 #include "../sound/sound_driver.hpp"
00017 #include "../video/video_driver.hpp"
00018 #include "extmidi.h"
00019 #include <fcntl.h>
00020 #include <sys/types.h>
00021 #include <sys/wait.h>
00022 #include <unistd.h>
00023 #include <signal.h>
00024 #include <sys/stat.h>
00025 #include <errno.h>
00026 
00027 #ifndef EXTERNAL_PLAYER
00028 #define EXTERNAL_PLAYER "timidity"
00029 #endif
00030 
00031 static FMusicDriver_ExtMidi iFMusicDriver_ExtMidi;
00032 
00033 const char *MusicDriver_ExtMidi::Start(const char * const * parm)
00034 {
00035   if (strcmp(_video_driver->GetName(), "allegro") == 0 ||
00036       strcmp(_sound_driver->GetName(), "allegro") == 0) {
00037     return "the extmidi driver does not work when Allegro is loaded.";
00038   }
00039 
00040   const char *command = GetDriverParam(parm, "cmd");
00041   if (StrEmpty(command)) command = EXTERNAL_PLAYER;
00042 
00043   this->command = strdup(command);
00044   this->song[0] = '\0';
00045   this->pid = -1;
00046   return NULL;
00047 }
00048 
00049 void MusicDriver_ExtMidi::Stop()
00050 {
00051   free(command);
00052   this->song[0] = '\0';
00053   this->DoStop();
00054 }
00055 
00056 void MusicDriver_ExtMidi::PlaySong(const char *filename)
00057 {
00058   strecpy(this->song, filename, lastof(this->song));
00059   this->DoStop();
00060 }
00061 
00062 void MusicDriver_ExtMidi::StopSong()
00063 {
00064   this->song[0] = '\0';
00065   this->DoStop();
00066 }
00067 
00068 bool MusicDriver_ExtMidi::IsSongPlaying()
00069 {
00070   if (this->pid != -1 && waitpid(this->pid, NULL, WNOHANG) == this->pid) {
00071     this->pid = -1;
00072   }
00073   if (this->pid == -1 && this->song[0] != '\0') this->DoPlay();
00074   return this->pid != -1;
00075 }
00076 
00077 void MusicDriver_ExtMidi::SetVolume(byte vol)
00078 {
00079   DEBUG(driver, 1, "extmidi: set volume not implemented");
00080 }
00081 
00082 void MusicDriver_ExtMidi::DoPlay()
00083 {
00084   this->pid = fork();
00085   switch (this->pid) {
00086     case 0: {
00087       close(0);
00088       int d = open("/dev/null", O_RDONLY);
00089       if (d != -1 && dup2(d, 1) != -1 && dup2(d, 2) != -1) {
00090         #if defined(MIDI_ARG)
00091           execlp(this->command, "extmidi", MIDI_ARG, this->song, (char*)0);
00092         #else
00093           execlp(this->command, "extmidi", this->song, (char*)0);
00094         #endif
00095       }
00096       _exit(1);
00097     }
00098 
00099     case -1:
00100       DEBUG(driver, 0, "extmidi: couldn't fork: %s", strerror(errno));
00101       /* FALLTHROUGH */
00102 
00103     default:
00104       this->song[0] = '\0';
00105       break;
00106   }
00107 }
00108 
00109 void MusicDriver_ExtMidi::DoStop()
00110 {
00111   if (this->pid != -1) kill(this->pid, SIGTERM);
00112 }
00113 
00114 #endif /* __MORPHOS__ */

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