# extmidi.cpp

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    00001 /* $Id: extmidi.cpp 22410 2011-05-02 16:14:23Z 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
    00030 #define EXTERNAL_PLAYER "timidity"
    00031 #endif
    00032
    00034 static FMusicDriver_ExtMidi iFMusicDriver_ExtMidi;
    00035
    00036 const char *MusicDriver_ExtMidi::Start(const char * const * parm)
    00037 {
    00038   if (strcmp(_video_driver->GetName(), "allegro") == 0 ||
    00039       strcmp(_sound_driver->GetName(), "allegro") == 0) {
    00040     return "the extmidi driver does not work when Allegro is loaded.";
    00041   }
    00042
    00043   const char *command = GetDriverParam(parm, "cmd");
    00044   if (StrEmpty(command)) command = EXTERNAL_PLAYER;
    00045
    00046   this->command = strdup(command);
    00047   this->song[0] = '\0';
    00048   this->pid = -1;
    00049   return NULL;
    00050 }
    00051
    00052 void MusicDriver_ExtMidi::Stop()
    00053 {
    00054   free(command);
    00055   this->song[0] = '\0';
    00056   this->DoStop();
    00057 }
    00058
    00059 void MusicDriver_ExtMidi::PlaySong(const char *filename)
    00060 {
    00061   strecpy(this->song, filename, lastof(this->song));
    00062   this->DoStop();
    00063 }
    00064
    00065 void MusicDriver_ExtMidi::StopSong()
    00066 {
    00067   this->song[0] = '\0';
    00068   this->DoStop();
    00069 }
    00070
    00071 bool MusicDriver_ExtMidi::IsSongPlaying()
    00072 {
    00073   if (this->pid != -1 && waitpid(this->pid, NULL, WNOHANG) == this->pid) {
    00074     this->pid = -1;
    00075   }
    00076   if (this->pid == -1 && this->song[0] != '\0') this->DoPlay();
    00077   return this->pid != -1;
    00078 }
    00079
    00080 void MusicDriver_ExtMidi::SetVolume(byte vol)
    00081 {
    00082   DEBUG(driver, 1, "extmidi: set volume not implemented");
    00083 }
    00084
    00085 void MusicDriver_ExtMidi::DoPlay()
    00086 {
    00087   this->pid = fork();
    00088   switch (this->pid) {
    00089     case 0: {
    00090       close(0);
    00091       int d = open("/dev/null", O_RDONLY);
    00092       if (d != -1 && dup2(d, 1) != -1 && dup2(d, 2) != -1) {
    00093         #if defined(MIDI_ARG)
    00094           execlp(this->command, "extmidi", MIDI_ARG, this->song, (char*)0);
    00095         #else
    00096           execlp(this->command, "extmidi", this->song, (char*)0);
    00097         #endif
    00098       }
    00099       _exit(1);
    00100     }
    00101
    00102     case -1:
    00103       DEBUG(driver, 0, "extmidi: couldn't fork: %s", strerror(errno));
    00104       /* FALL THROUGH */
    00105
    00106     default:
    00107       this->song[0] = '\0';
    00108       break;
    00109   }
    00110 }
    00111
    00112 void MusicDriver_ExtMidi::DoStop()
    00113 {
    00114   if (this->pid <= 0) return;
    00115
    00116   /* First try to gracefully stop for about five seconds;
    00117    * 5 seconds = 5000 milliseconds, 10 ms per cycle => 500 cycles. */
    00118   for (int i = 0; i < 500; i++) {
    00119     kill(this->pid, SIGTERM);
    00120     if (waitpid(this->pid, NULL, WNOHANG) == this->pid) {
    00121       /* It has shut down, so we are done */
    00122       this->pid = -1;
    00123       return;
    00124     }
    00125     /* Wait 10 milliseconds. */
    00126     CSleep(10);
    00127   }
    00128
    00129   DEBUG(driver, 0, "extmidi: gracefully stopping failed, trying the hard way");
    00130   /* Gracefully stopping failed. Do it the hard way
    00131    * and wait till the process finally died. */
    00132   kill(this->pid, SIGKILL);
    00133   waitpid(this->pid, NULL, 0);
    00134   this->pid = -1;
    00135 }
    00136
    00137 #endif /* __MORPHOS__ */