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

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