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