extmidi.cpp

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00001 /* $Id: extmidi.cpp 19175 2010-02-20 21:10:58Z 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 "../gfx_func.h"
00019 #include "extmidi.h"
00020 #include <fcntl.h>
00021 #include <sys/types.h>
00022 #include <sys/wait.h>
00023 #include <unistd.h>
00024 #include <signal.h>
00025 #include <sys/stat.h>
00026 #include <errno.h>
00027 
00028 #ifndef EXTERNAL_PLAYER
00029 #define EXTERNAL_PLAYER "timidity"
00030 #endif
00031 
00032 static FMusicDriver_ExtMidi iFMusicDriver_ExtMidi;
00033 
00034 const char *MusicDriver_ExtMidi::Start(const char * const * parm)
00035 {
00036   if (strcmp(_video_driver->GetName(), "allegro") == 0 ||
00037       strcmp(_sound_driver->GetName(), "allegro") == 0) {
00038     return "the extmidi driver does not work when Allegro is loaded.";
00039   }
00040 
00041   const char *command = GetDriverParam(parm, "cmd");
00042   if (StrEmpty(command)) command = EXTERNAL_PLAYER;
00043 
00044   this->command = strdup(command);
00045   this->song[0] = '\0';
00046   this->pid = -1;
00047   return NULL;
00048 }
00049 
00050 void MusicDriver_ExtMidi::Stop()
00051 {
00052   free(command);
00053   this->song[0] = '\0';
00054   this->DoStop();
00055 }
00056 
00057 void MusicDriver_ExtMidi::PlaySong(const char *filename)
00058 {
00059   strecpy(this->song, filename, lastof(this->song));
00060   this->DoStop();
00061 }
00062 
00063 void MusicDriver_ExtMidi::StopSong()
00064 {
00065   this->song[0] = '\0';
00066   this->DoStop();
00067 }
00068 
00069 bool MusicDriver_ExtMidi::IsSongPlaying()
00070 {
00071   if (this->pid != -1 && waitpid(this->pid, NULL, WNOHANG) == this->pid) {
00072     this->pid = -1;
00073   }
00074   if (this->pid == -1 && this->song[0] != '\0') this->DoPlay();
00075   return this->pid != -1;
00076 }
00077 
00078 void MusicDriver_ExtMidi::SetVolume(byte vol)
00079 {
00080   DEBUG(driver, 1, "extmidi: set volume not implemented");
00081 }
00082 
00083 void MusicDriver_ExtMidi::DoPlay()
00084 {
00085   this->pid = fork();
00086   switch (this->pid) {
00087     case 0: {
00088       close(0);
00089       int d = open("/dev/null", O_RDONLY);
00090       if (d != -1 && dup2(d, 1) != -1 && dup2(d, 2) != -1) {
00091         #if defined(MIDI_ARG)
00092           execlp(this->command, "extmidi", MIDI_ARG, this->song, (char*)0);
00093         #else
00094           execlp(this->command, "extmidi", this->song, (char*)0);
00095         #endif
00096       }
00097       _exit(1);
00098     }
00099 
00100     case -1:
00101       DEBUG(driver, 0, "extmidi: couldn't fork: %s", strerror(errno));
00102       /* FALLTHROUGH */
00103 
00104     default:
00105       this->song[0] = '\0';
00106       break;
00107   }
00108 }
00109 
00110 void MusicDriver_ExtMidi::DoStop()
00111 {
00112   if (this->pid <= 0) return;
00113 
00114   /* First try to gracefully stop for about five seconds;
00115    * 5 seconds = 5000 milliseconds, 10 ms per cycle => 500 cycles. */
00116   for (int i = 0; i < 500; i++) {
00117     kill(this->pid, SIGTERM);
00118     if (waitpid(this->pid, NULL, WNOHANG) == this->pid) {
00119       /* It has shut down, so we are done */
00120       this->pid = -1;
00121       return;
00122     }
00123     /* Wait 10 milliseconds. */
00124     CSleep(10);
00125   }
00126 
00127   DEBUG(driver, 0, "extmidi: gracefully stopping failed, trying the hard way");
00128   /* Gracefully stopping failed. Do it the hard way
00129    * and wait till the process finally died. */
00130   kill(this->pid, SIGKILL);
00131   waitpid(this->pid, NULL, 0);
00132   this->pid = -1;
00133 }
00134 
00135 #endif /* __MORPHOS__ */

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