extmidi.cpp

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00001 /* $Id: extmidi.cpp 15299 2009-01-31 20:16:06Z smatz $ */
00002 
00005 #ifndef __MORPHOS__
00006 #include "../stdafx.h"
00007 #include "../debug.h"
00008 #include "extmidi.h"
00009 #include <fcntl.h>
00010 #include <sys/types.h>
00011 #include <sys/wait.h>
00012 #include <unistd.h>
00013 #include <signal.h>
00014 #include <sys/stat.h>
00015 #include <errno.h>
00016 
00017 #ifndef EXTERNAL_PLAYER
00018 #define EXTERNAL_PLAYER "timidity"
00019 #endif
00020 
00021 static FMusicDriver_ExtMidi iFMusicDriver_ExtMidi;
00022 
00023 const char *MusicDriver_ExtMidi::Start(const char * const * parm)
00024 {
00025   const char *command = GetDriverParam(parm, "cmd");
00026   if (StrEmpty(command)) command = EXTERNAL_PLAYER;
00027 
00028   this->command = strdup(command);
00029   this->song[0] = '\0';
00030   this->pid = -1;
00031   return NULL;
00032 }
00033 
00034 void MusicDriver_ExtMidi::Stop()
00035 {
00036   free(command);
00037   this->song[0] = '\0';
00038   this->DoStop();
00039 }
00040 
00041 void MusicDriver_ExtMidi::PlaySong(const char *filename)
00042 {
00043   strecpy(this->song, filename, lastof(this->song));
00044   this->DoStop();
00045 }
00046 
00047 void MusicDriver_ExtMidi::StopSong()
00048 {
00049   this->song[0] = '\0';
00050   this->DoStop();
00051 }
00052 
00053 bool MusicDriver_ExtMidi::IsSongPlaying()
00054 {
00055   if (this->pid != -1 && waitpid(this->pid, NULL, WNOHANG) == this->pid)
00056     this->pid = -1;
00057   if (this->pid == -1 && this->song[0] != '\0') this->DoPlay();
00058   return this->pid != -1;
00059 }
00060 
00061 void MusicDriver_ExtMidi::SetVolume(byte vol)
00062 {
00063   DEBUG(driver, 1, "extmidi: set volume not implemented");
00064 }
00065 
00066 void MusicDriver_ExtMidi::DoPlay()
00067 {
00068   this->pid = fork();
00069   switch (this->pid) {
00070     case 0: {
00071       int d;
00072 
00073       close(0);
00074       d = open("/dev/null", O_RDONLY);
00075       if (d != -1 && dup2(d, 1) != -1 && dup2(d, 2) != -1) {
00076         #if defined(MIDI_ARG)
00077           execlp(this->command, "extmidi", MIDI_ARG, this->song, (char*)0);
00078         #else
00079           execlp(this->command, "extmidi", this->song, (char*)0);
00080         #endif
00081       }
00082       _exit(1);
00083     }
00084 
00085     case -1:
00086       DEBUG(driver, 0, "extmidi: couldn't fork: %s", strerror(errno));
00087       /* FALLTHROUGH */
00088 
00089     default:
00090       this->song[0] = '\0';
00091       break;
00092   }
00093 }
00094 
00095 void MusicDriver_ExtMidi::DoStop()
00096 {
00097   if (this->pid != -1) kill(this->pid, SIGTERM);
00098 }
00099 
00100 #endif /* __MORPHOS__ */

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