# 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__ */