player.c

/* the Music Player Daemon (MPD)
 * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
 * This project's homepage is: http://www.musicpd.org
 *
 * This program 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "player.h"
#include "decode.h"
#include "command.h"
#include "interface.h"
#include "playlist.h"
#include "ls.h"
#include "listen.h"
#include "path.h"
#include "log.h"
#include "utils.h"
#include "tables.h"
#include "directory.h"
#include "volume.h"
#include "playerData.h"
#include "permission.h"

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

int player_pid = 0;
int player_termSent = 0;

void resetPlayer() {
	int pid;

	player_pid = 0;
	player_termSent = 0;
	getPlayerData()->playerControl.stop = 0;
	getPlayerData()->playerControl.play = 0;
	getPlayerData()->playerControl.pause = 0;
	getPlayerData()->playerControl.lockQueue = 0;
	getPlayerData()->playerControl.unlockQueue = 0;
	getPlayerData()->playerControl.state = PLAYER_STATE_STOP;
	getPlayerData()->playerControl.queueState = PLAYER_QUEUE_UNLOCKED;
	getPlayerData()->playerControl.seek = 0;
	/* kill decode process if it got left running */
	pid = getPlayerData()->playerControl.decode_pid;
	if(pid>0) kill(pid,SIGTERM);
	getPlayerData()->playerControl.decode_pid = 0;
}

void player_sigHandler(int signal) {
	if(signal==SIGCHLD) {
		int status;
		int pid = wait3(&status,WNOHANG,NULL);
		if(player_pid==pid) {
			if(WIFSIGNALED(status) && WTERMSIG(status)!=SIGTERM) {
				ERROR("player process died from a "
						"non-TERM signal: %i\n",
						WTERMSIG(status));
			}
			resetPlayer();
		}
		else if(pid==getPlayerData()->playerControl.decode_pid &&
				player_pid<=0) 
		{
			if(WIFSIGNALED(status) && WTERMSIG(status)!=SIGTERM) {
				ERROR("(caught by master parent) "
						"decode process died from a "
						"non-TERM signal: %i\n",
						WTERMSIG(status));
			}
			getPlayerData()->playerControl.decode_pid = 0;
		}
	}
}

int playerInit() {
	player_pid = fork();

	if(player_pid==0) {
		PlayerControl * pc = &(getPlayerData()->playerControl);
		struct sigaction sa;
		sa.sa_flags = 0;
		sigemptyset(&sa.sa_mask);

		sa.sa_handler = SIG_IGN;
		sigaction(SIGPIPE,&sa,NULL);
		sa.sa_handler = decodeSigHandler;
		sigaction(SIGCHLD,&sa,NULL);
		sigaction(SIGTERM,&sa,NULL);

		close(listenSocket);
		freeAllInterfaces();
		closeMp3Directory();
		finishPlaylist();
		closeTables();
		finishPaths();
		finishPermissions();
		finishCommands();
		finishVolume();

		while(1) {
			if(pc->play) decode();
			else if(pc->stop) pc->stop = 0;
			else if(pc->pause) pc->pause = 0;
			else if(pc->closeAudio) {
				finishAudio();
				pc->closeAudio = 0;
				kill(getppid(),SIGUSR1);
			}
			else if(pc->lockQueue) {
				pc->queueLockState = PLAYER_QUEUE_LOCKED;
				pc->lockQueue = 0;
			}
			else if(pc->unlockQueue) {
				pc->queueLockState = PLAYER_QUEUE_UNLOCKED;
				pc->unlockQueue = 0;
			}
			else usleep(10000);
		}

		exit(0);
	}
	else if(player_pid<0) {
		ERROR("player Problems fork()'ing\n");
		player_pid = 0;

		return -1;
	}

	return 0;
}

int playerPlay(FILE * fp, char * utf8file) {
	PlayerControl * pc = &(getPlayerData()->playerControl);
	if(fp==NULL) fp = stderr;

	if(playerStop(fp)<0) return -1;

	{
		struct stat st;
		if(stat(rmp2amp(utf8ToFsCharset(utf8file)),&st)<0) {
			strncpy(pc->erroredFile,pc->file,MAXPATHLEN);
			pc->error = PLAYER_ERROR_FILENOTFOUND;
			return 0;
		}
	}

	if(0);
#ifdef HAVE_MAD
	else if(isMp3(utf8file,NULL)) pc->decodeType = DECODE_TYPE_MP3;
#endif
#ifdef HAVE_OGG	
	else if(isOgg(utf8file,NULL)) pc->decodeType = DECODE_TYPE_OGG;
#endif
#ifdef HAVE_FLAC	
	else if(isFlac(utf8file,NULL)) pc->decodeType = DECODE_TYPE_FLAC;
#endif
#ifdef HAVE_AUDIOFILE
	else if(isWave(utf8file,NULL)) pc->decodeType = DECODE_TYPE_AUDIOFILE;
#endif
#ifdef HAVE_FAAD
	else if(isAac(utf8file,NULL)) pc->decodeType = DECODE_TYPE_AAC;
	else if(isMp4(utf8file,NULL)) pc->decodeType = DECODE_TYPE_MP4;
#endif
	else {
		strncpy(pc->erroredFile,pc->file,MAXPATHLEN);
		pc->error = PLAYER_ERROR_UNKTYPE;
		return 0;
	}

	strncpy(pc->file,rmp2amp(utf8ToFsCharset(utf8file)),MAXPATHLEN);

	pc->play = 1;
	if(player_pid==0 && playerInit()<0) {
		pc->play = 0;
		return -1;
	}
	
	while(player_pid>0 && pc->play) usleep(10);
	
	return 0;
}

int playerStop(FILE * fp) {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(player_pid>0 && pc->state!=PLAYER_STATE_STOP) {
		pc->stop = 1;
		while(player_pid>0 && pc->stop) usleep(10);
	}

	pc->queueState = PLAYER_QUEUE_BLANK;
	playerQueueUnlock();

	return 0;
}

void playerKill() {
	int pid;
	PlayerControl * pc = &(getPlayerData()->playerControl);

	playerStop(stderr);
	playerCloseAudio(stderr);
	if(player_pid>0 && pc->closeAudio) sleep(1);

	pid = player_pid;
	if(pid>0) kill(pid,SIGTERM);
}

int playerPause(FILE * fp) {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(player_pid>0 && pc->state!=PLAYER_STATE_STOP) {
		pc->pause = 1;
		while(player_pid>0 && pc->pause) usleep(10);
	}

	return 0;
}

int playerSetPause(FILE * fp, int pause) {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(player_pid<=0) return 0;

	switch(pc->state) {
	case PLAYER_STATE_PLAY:
		if(pause) playerPause(fp);
		break;
	case PLAYER_STATE_PAUSE:
		if(!pause) playerPause(fp);
		break;
	}

	return 0;
}

int getPlayerElapsedTime() {
	return (int)(getPlayerData()->playerControl.elapsedTime+0.5);
}

unsigned long getPlayerBitRate() {
	return getPlayerData()->playerControl.bitRate;
}

int getPlayerTotalTime() {
	return (int)(getPlayerData()->playerControl.totalTime+0.5);
}

int getPlayerState() {
	return getPlayerData()->playerControl.state;
}

void clearPlayerError() {
	getPlayerData()->playerControl.error = 0;
}

int getPlayerError() {
	return getPlayerData()->playerControl.error;
}

char * getPlayerErrorStr() {
	static char error[2*MAXPATHLEN];
	PlayerControl * pc = &(getPlayerData()->playerControl);

	switch(pc->error) {
	case PLAYER_ERROR_FILENOTFOUND:
		sprintf(error,"file \"%s\" does not exist or is inaccesible",
				pc->erroredFile);
		return error;
	case PLAYER_ERROR_FILE:
		sprintf(error,"problems decoding \"%s\"",pc->erroredFile);
		return error;
	case PLAYER_ERROR_AUDIO:
		sprintf(error,"problems opening audio device");
		return error;
	case PLAYER_ERROR_SYSTEM:
		sprintf(error,"system error occured");
		return error;
	case PLAYER_ERROR_UNKTYPE:
		sprintf(error,"file type  of \"%s\" is unknown",pc->erroredFile);
		return error;
	default:
		return NULL;
	}
}

void playerCloseAudio() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(player_pid>0) {
		if(playerStop(stderr)<0) return;
		pc->closeAudio = 1;
	}
}

int queueSong(char * utf8file) {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(pc->queueState==PLAYER_QUEUE_BLANK) {
		strncpy(pc->file,rmp2amp(utf8ToFsCharset(utf8file)),MAXPATHLEN);

		if(0);
#ifdef HAVE_MAD
		else if(isMp3(utf8file,NULL)) pc->decodeType = DECODE_TYPE_MP3;
#endif
#ifdef HAVE_OGG	
		else if(isOgg(utf8file,NULL)) pc->decodeType = DECODE_TYPE_OGG;
#endif
#ifdef HAVE_FLAC	
		else if(isFlac(utf8file,NULL)) {
			pc->decodeType = DECODE_TYPE_FLAC;
		}
#endif
#ifdef HAVE_AUDIOFILE
		else if(isWave(utf8file,NULL)) {
			pc->decodeType = DECODE_TYPE_AUDIOFILE;
		}
#endif
		else return -1;
		pc->queueState = PLAYER_QUEUE_FULL;
		return 0;
	}

	return -1;
}

int getPlayerQueueState() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	return pc->queueState;
}

void setQueueState(int queueState) {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	pc->queueState = queueState;
}

void playerQueueLock() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(player_pid>0 && pc->queueLockState==PLAYER_QUEUE_UNLOCKED)
	{
		pc->lockQueue = 1;
		while(player_pid>0 && pc->lockQueue) usleep(10);
	}
}

void playerQueueUnlock() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(player_pid>0 && pc->queueLockState==PLAYER_QUEUE_LOCKED)
	{
		pc->unlockQueue = 1;
		while(player_pid>0 && pc->unlockQueue) usleep(10);
	}
}

int playerSeek(FILE * fp, char * utf8file, float time) {
	PlayerControl * pc = &(getPlayerData()->playerControl);
	char * file;

	if(pc->state==PLAYER_STATE_STOP) {
		myfprintf(fp,"%s player not currently playing\n",
				COMMAND_RESPOND_ERROR);
		return -1;
	}

	file = rmp2amp(utf8ToFsCharset(utf8file));
	if(strcmp(pc->file,file)!=0) strncpy(pc->file,file,MAXPATHLEN);
		/*if(playerStop(fp)<0) return -1;
		if(playerPlay(stderr,file)<0) return -1;*/
	/*}*/

	if(pc->error==PLAYER_ERROR_NOERROR) {
		pc->seekWhere = time;
		pc->seek = 1;
		while(player_pid>0 && pc->seek) usleep(10);
	}

	return 0;
}

float getPlayerCrossFade() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	return pc->crossFade;
}

void setPlayerCrossFade(float crossFadeInSeconds) {
	PlayerControl * pc;
	if(crossFadeInSeconds<0) crossFadeInSeconds = 0;

	pc = &(getPlayerData()->playerControl);

	pc->crossFade = crossFadeInSeconds;
}

void setPlayerSoftwareVolume(int volume) {
	PlayerControl * pc;
	volume = (volume>100) ? 100 : (volume<0 ? 0 : volume);

	pc = &(getPlayerData()->playerControl);

	pc->softwareVolume = volume;
}

int getPlayerSoftwareVolume() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	return pc->softwareVolume;
}

double getPlayerTotalPlayTime() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	if(pc->state==PLAYER_STATE_STOP) {
		return pc->totalPlayTime;
	}

	return pc->totalPlayTime+pc->elapsedTime-pc->beginTime;
}

unsigned int getPlayerSampleRate() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	return pc->sampleRate;
}

int getPlayerBits() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	return pc->bits;
}

int getPlayerChannels() {
	PlayerControl * pc = &(getPlayerData()->playerControl);

	return pc->channels;
}