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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file extmidi.cpp Playing music via an external player. */
#include "../stdafx.h"
#include "../debug.h"
#include "../string_func.h"
#include "../core/alloc_func.hpp"
#include "../sound/sound_driver.hpp"
#include "../video/video_driver.hpp"
#include "../gfx_func.h"
#include "extmidi.h"
#include "../base_media_base.h"
#include <fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
#include <sys/stat.h>
#include <errno.h>
#include "../safeguards.h"
#ifndef EXTERNAL_PLAYER
/** The default external midi player. */
#define EXTERNAL_PLAYER "timidity"
#endif
/** Factory for the midi player that uses external players. */
static FMusicDriver_ExtMidi iFMusicDriver_ExtMidi;
const char *MusicDriver_ExtMidi::Start(const char * const * parm)
{
if (strcmp(VideoDriver::GetInstance()->GetName(), "allegro") == 0 ||
strcmp(SoundDriver::GetInstance()->GetName(), "allegro") == 0) {
return "the extmidi driver does not work when Allegro is loaded.";
}
const char *command = GetDriverParam(parm, "cmd");
#ifndef MIDI_ARG
if (StrEmpty(command)) command = EXTERNAL_PLAYER;
#else
if (StrEmpty(command)) command = EXTERNAL_PLAYER " " MIDI_ARG;
#endif
/* Count number of arguments, but include 3 extra slots: 1st for command, 2nd for song title, and 3rd for terminating NULL. */
uint num_args = 3;
for (const char *t = command; *t != '\0'; t++) if (*t == ' ') num_args++;
this->params = CallocT<char *>(num_args);
this->params[0] = stredup(command);
/* Replace space with \0 and add next arg to params */
uint p = 1;
while (true) {
this->params[p] = strchr(this->params[p - 1], ' ');
if (this->params[p] == NULL) break;
this->params[p][0] = '\0';
this->params[p]++;
p++;
}
/* Last parameter is the song file. */
this->params[p] = this->song;
this->song[0] = '\0';
this->pid = -1;
return NULL;
}
void MusicDriver_ExtMidi::Stop()
{
free(params[0]);
free(params);
this->song[0] = '\0';
this->DoStop();
}
void MusicDriver_ExtMidi::PlaySong(const MusicSongInfo &song)
{
if (song.filetype != MTT_STANDARDMIDI) return;
strecpy(this->song, song.filename, lastof(this->song));
this->DoStop();
}
void MusicDriver_ExtMidi::StopSong()
{
this->song[0] = '\0';
this->DoStop();
}
bool MusicDriver_ExtMidi::IsSongPlaying()
{
if (this->pid != -1 && waitpid(this->pid, NULL, WNOHANG) == this->pid) {
this->pid = -1;
}
if (this->pid == -1 && this->song[0] != '\0') this->DoPlay();
return this->pid != -1;
}
void MusicDriver_ExtMidi::SetVolume(byte vol)
{
DEBUG(driver, 1, "extmidi: set volume not implemented");
}
void MusicDriver_ExtMidi::DoPlay()
{
this->pid = fork();
switch (this->pid) {
case 0: {
close(0);
int d = open("/dev/null", O_RDONLY);
if (d != -1 && dup2(d, 1) != -1 && dup2(d, 2) != -1) {
execvp(this->params[0], this->params);
}
_exit(1);
}
case -1:
DEBUG(driver, 0, "extmidi: couldn't fork: %s", strerror(errno));
FALLTHROUGH;
default:
this->song[0] = '\0';
break;
}
}
void MusicDriver_ExtMidi::DoStop()
{
if (this->pid <= 0) return;
/* First try to gracefully stop for about five seconds;
* 5 seconds = 5000 milliseconds, 10 ms per cycle => 500 cycles. */
for (int i = 0; i < 500; i++) {
kill(this->pid, SIGTERM);
if (waitpid(this->pid, NULL, WNOHANG) == this->pid) {
/* It has shut down, so we are done */
this->pid = -1;
return;
}
/* Wait 10 milliseconds. */
CSleep(10);
}
DEBUG(driver, 0, "extmidi: gracefully stopping failed, trying the hard way");
/* Gracefully stopping failed. Do it the hard way
* and wait till the process finally died. */
kill(this->pid, SIGKILL);
waitpid(this->pid, NULL, 0);
this->pid = -1;
}
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