# extmidi.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 #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__ */