extmidi.cpp
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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
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
00115
00116 for (int i = 0; i < 500; i++) {
00117 kill(this->pid, SIGTERM);
00118 if (waitpid(this->pid, NULL, WNOHANG) == this->pid) {
00119
00120 this->pid = -1;
00121 return;
00122 }
00123
00124 CSleep(10);
00125 }
00126
00127 DEBUG(driver, 0, "extmidi: gracefully stopping failed, trying the hard way");
00128
00129
00130 kill(this->pid, SIGKILL);
00131 waitpid(this->pid, NULL, 0);
00132 this->pid = -1;
00133 }
00134
00135 #endif