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dockapps/wmcdplay/cdctl.h

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// cdctl.h - CDCtl class provides easy control of cd audio functions
// 05/09/98 Release 1.0 Beta1
// Copyright (C) 1998 Sam Hawker <shawkie@geocities.com>
// This software comes with ABSOLUTELY NO WARRANTY
// This software is free software, and you are welcome to redistribute it
// under certain conditions
// See the README file for a more complete notice.
// Although cdctl.h is an integral part of wmcdplay, it may also be distributed seperately.
// Change this define to alter the size of forward and backward skips (in frames)
// Yes, I know this should really be a method of CDCtl
#define _CDCTL_SKIP_SIZE 1125
// Try defining some of these. They may improve performance or reliability
// (or just plain make it work)
// #define _CDCTL_STOP_BEFORE_PLAY
// #define _CDCTL_START_BEFORE_PLAY
// #define _CDCTL_SOFT_STOP
// Define this if it stops after each track
#define _CDCTL_SENSITIVE_EOT
// If it still stops for a while between tracks, increase this (0-75 is a sensible range)
#define _CDCTL_SENSITIVITY 0
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/cdrom.h>
// CD status values
#define ssData 0
#define ssStopped 1
#define ssPlaying 2
#define ssPaused 3
#define ssNoCD 4
#define ssTrayOpen 5
// Audio command values
#define acStop 0
#define acPlay 1
#define acPause 2
#define acResume 3
#define acPrev 4
#define acNext 5
#define acRewd 6
#define acFFwd 7
#define acEject 8
#define acClose 9
// Track selection values (what to do when I've played the requested track)
// Note: Track selection is not perfect - so use tsNone if you want to avoid trouble.
// Basically, if we receive a CDROM_AUDIO_COMPLETED status, then we have to decide what to do.
// If we think the last play command was ours (Next/Prev/FFwd/Rewd don't count), then we do something,
// depending on the current track selection mode.
// Failures: Sometimes we may think we sent the last play command when we did not (if we didn't see play stop in
// in between).
// If another application is polling the status, it may receive the CDROM_AUDIO_COMPLETED we are looking
// for, and we will not, so will think play was stopped manually.
// Similarly, we may read the CDROM_AUDIO_COMPLETED status when we don't want it, such that the other
// application never sees it.
// Verdict: Linux audio cdrom handling is broken.
// Update: New define _CDCTL_SENSITIVE_EOT may help in cases where CDROM_AUDIO_COMPLETED is not being returned
// correctly. It may, however, interfere with other running cd players.
// Update: I think this works like a dream now. Even with many cd players sharing a cdrom. Let me know if not!!
#define tsNone 0 // Just stop
#define tsRepeat 1 // Play it again
#define tsNext 2 // Play next track (stop at end of CD)
#define tsRepeatCD 3 // Play next track (start from first track if end is reached)
#define tsRandom 4 // Play a track at random
class CDCtl
{
public:
CDCtl(char *dname){
device=(char *)malloc(sizeof(char)*(strlen(dname)+1));
strcpy(device,dname);
srand(getpid());
tracksel=tsRandom;
tskOurPlay=false;
if(cdfdopen=(cdfd=open(device,O_RDONLY | O_NONBLOCK))!=-1){
status_state=ssNoCD;
status_track=0;
status_pos=0;
cd_trklist=NULL;
doStatus();
readVolume();
}
}
~CDCtl(){
if(cdfdopen){
close(cdfd);
if(device!=NULL)
free(device);
if(cd_trklist!=NULL)
free(cd_trklist);
}
}
bool openOK(){
return cdfdopen;
}
void doAudioCommand(int cmd){
if(cdfdopen){
int newtrk=status_track;
switch(cmd){
case acStop:
#ifdef _CDCTL_SOFT_STOP
ioctl(cdfd,CDROMSTART);
#endif
#ifndef _CDCTL_SOFT_STOP
ioctl(cdfd,CDROMSTOP);
#endif
tskOurPlay=false;
break;
case acPlay:
status_state=ssPlaying;
select(status_track);
tskOurPlay=true;
break;
case acPause:
ioctl(cdfd,CDROMPAUSE);
break;
case acResume:
ioctl(cdfd,CDROMRESUME);
break;
case acPrev:
newtrk--;
if(newtrk<0)
newtrk=cd_tracks-1;
select(newtrk);
break;
case acNext:
newtrk++;
if(newtrk>cd_tracks-1)
newtrk=0;
select(newtrk);
break;
case acRewd:
if(status_pos>cd_trklist[status_track].track_start+_CDCTL_SKIP_SIZE){
status_pos-=_CDCTL_SKIP_SIZE;
play();
}
break;
case acFFwd:
if(status_pos<cd_trklist[status_track].track_start+cd_trklist[status_track].track_len-_CDCTL_SKIP_SIZE){
status_pos+=_CDCTL_SKIP_SIZE;
play();
}
break;
case acEject:
if(ioctl(cdfd,CDROMEJECT))
status_state=ssNoCD;
else
status_state=ssTrayOpen;
break;
case acClose:
ioctl(cdfd,CDROMCLOSETRAY);
status_state=ssNoCD;
break;
}
doStatus();
}
}
void doStatus(){
if(cdfdopen){
struct cdrom_subchnl sc;
sc.cdsc_format=CDROM_MSF;
if(ioctl(cdfd, CDROMSUBCHNL, &sc)){
if(status_state!=ssNoCD)
status_state=ssTrayOpen;
status_track=0;
status_pos=0;
tskOurPlay=false;
}
else{
if(status_state==ssNoCD || status_state==ssTrayOpen)
readTOC();
int start,now,stop;
switch(sc.cdsc_audiostatus){
case CDROM_AUDIO_PLAY:
if(status_state==ssStopped)
tskOurPlay=false;
status_state=ssPlaying;
break;
case CDROM_AUDIO_PAUSED:
if(status_state==ssStopped)
tskOurPlay=false;
status_state=ssPaused;
break;
case CDROM_AUDIO_COMPLETED:
if(tskOurPlay){
status_state=ssPlaying;
selecttrack();
doStatus();
return;
}
else
status_state=ssStopped;
break;
default:
#ifdef _CDCTL_SENSITIVE_EOT
if(tskOurPlay){
start = cd_trklist[status_track].track_start;
stop = start + cd_trklist[status_track].track_len - _CDCTL_SENSITIVITY;
now = ((sc.cdsc_absaddr.msf.minute) * 60 + sc.cdsc_absaddr.msf.second) * 75 + sc.cdsc_absaddr.msf.frame - CD_MSF_OFFSET;
if(now>0 && (now<start || now>=stop)){
status_state=ssPlaying;
selecttrack();
doStatus();
return;
}
else
status_state=ssStopped;
}
else
#endif
status_state=ssStopped;
}
trackinfo(&sc);
if(cd_trklist[status_track].track_data)
status_state=ssData;
}
}
}
void setVolume(int l, int r){
if(cdfdopen){
struct cdrom_volctrl vol;
vol.channel0=l;
vol.channel1=r;
ioctl(cdfd,CDROMVOLCTRL,&vol);
readVolume();
}
}
void readVolume(){
if(cdfdopen){
struct cdrom_volctrl vol;
ioctl(cdfd,CDROMVOLREAD,&vol);
status_volumel=vol.channel0;
status_volumer=vol.channel1;
}
}
int getVolumeL(){
return status_volumel;
}
int getVolumeR(){
return status_volumer;
}
void setTrackSelection(int ts){
tracksel=ts;
}
int getTrackSelection(){
return tracksel;
}
char *getDevName(){
return device;
}
int getCDTracks(){
return cd_tracks;
}
int getCDLen(){
return cd_len;
}
int getTrackStart(int trk){
return cd_trklist[trk-1].track_start;
}
int getTrackLen(int trk){
return cd_trklist[trk-1].track_len;
}
bool getTrackData(int trk){
return cd_trklist[trk-1].track_data;
}
int getStatusState(){
return status_state;
}
int getStatusTrack(){
return status_track+1;
}
int getStatusPosAbs(){
return status_pos-cd_trklist[0].track_start;
}
int getStatusPosRel(){
return status_pos-cd_trklist[status_track].track_start;
}
private:
void readTOC(){
if(cd_trklist!=NULL)
free(cd_trklist);
struct cdrom_tochdr hdr;
ioctl(cdfd, CDROMREADTOCHDR, &hdr);
cd_tracks=hdr.cdth_trk1;
cd_trklist=(struct CDTrack *)malloc(cd_tracks*sizeof(struct CDTrack));
struct cdrom_tocentry te;
int prev_addr=0;
for(int i=0;i<=cd_tracks;i++){
if(i==cd_tracks)
te.cdte_track=CDROM_LEADOUT;
else
te.cdte_track=i+1;
te.cdte_format=CDROM_MSF; // I think it is ok to read this as LBA, but for a quiet life...
ioctl(cdfd, CDROMREADTOCENTRY, &te);
int this_addr=((te.cdte_addr.msf.minute * 60) + te.cdte_addr.msf.second) * 75 + te.cdte_addr.msf.frame - CD_MSF_OFFSET;
if(i>0)
cd_trklist[i-1].track_len = this_addr - prev_addr - 1;
prev_addr=this_addr;
if(i<cd_tracks){
cd_trklist[i].track_data = te.cdte_ctrl & CDROM_DATA_TRACK ? true : false;
cd_trklist[i].track_start = this_addr;
}
else
cd_len = this_addr;
}
}
void trackinfo(struct cdrom_subchnl *subchnl){
if(status_state==ssPlaying || status_state==ssPaused){
status_pos=((subchnl->cdsc_absaddr.msf.minute) * 60 + subchnl->cdsc_absaddr.msf.second) * 75 + subchnl->cdsc_absaddr.msf.frame - CD_MSF_OFFSET;
for(status_track=0;status_track<cd_tracks;status_track++){
if(status_pos<cd_trklist[status_track].track_start+cd_trklist[status_track].track_len)
break;
}
}
}
void play(){
struct cdrom_msf pmsf;
int abs0=status_pos + CD_MSF_OFFSET;
int abs1=cd_trklist[status_track].track_start + cd_trklist[status_track].track_len - 1 + CD_MSF_OFFSET;
pmsf.cdmsf_min0=abs0/(75*60);
pmsf.cdmsf_min1=abs1/(75*60);
pmsf.cdmsf_sec0=(abs0%(75*60))/75;
pmsf.cdmsf_sec1=(abs1%(75*60))/75;
pmsf.cdmsf_frame0=abs0%75;
pmsf.cdmsf_frame1=abs1%75;
#ifdef _CDCTL_STOP_BEFORE_PLAY
ioctl(cdfd,CDROMSTOP);
#endif
#ifdef _CDCTL_START_BEFORE_PLAY
ioctl(cdfd,CDROMSTART);
#endif
ioctl(cdfd,CDROMPLAYMSF,&pmsf);
}
void select(int trk){
status_track=trk;
status_pos=cd_trklist[status_track].track_start;
if(status_state==ssPlaying){
if(cd_trklist[status_track].track_data){
#ifdef _CDCTL_HARD_STOP
ioctl(cdfd,CDROMSTOP);
#endif
#ifndef _CDCTL_HARD_STOP
ioctl(cdfd,CDROMSTART);
#endif
tskOurPlay=false;
}
else
play();
}
}
void selecttrack(){
int newtrk=status_track;
do{
switch(tracksel){
case tsNone:
tskOurPlay=false;
return;
break;
case tsRepeat:
// do nothing
break;
case tsNext:
newtrk++;
if(newtrk>=cd_tracks){
tskOurPlay=false;
return;
}
break;
case tsRepeatCD:
newtrk++;
if(newtrk>=cd_tracks)
newtrk=0;
break;
case tsRandom:
newtrk+=(int)((cd_tracks-1)*(float)rand()/RAND_MAX+1);
if(newtrk>=cd_tracks)
newtrk-=cd_tracks;
break;
}
} while(cd_trklist[newtrk].track_data);
select(newtrk);
play();
}
int cdfd;
int cdfdopen;
char *device;
int tracksel;
bool tskOurPlay;
struct CDTrack{
int track_start;
int track_len;
bool track_data;
};
int cd_tracks;
int cd_len;
struct CDTrack *cd_trklist;
int status_state;
int status_track;
int status_pos;
int status_volumel;
int status_volumer;
};
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