459 lines
14 KiB
C
459 lines
14 KiB
C
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// cdctl.h - CDCtl class provides easy control of cd audio functions
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// Copyright (C) 1998 Sam Hawker <shawkie@geocities.com>
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// This software comes with ABSOLUTELY NO WARRANTY
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// This software is free software, and you are welcome to redistribute it
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// under certain conditions
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// See the README file for a more complete notice.
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// Although cdctl.h is an integral part of wmcdplay, it may also be distributed seperately.
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// Change this define to alter the size of forward and backward skips (in frames)
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// Yes, I know this should really be a method of CDCtl
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#define _CDCTL_SKIP_SIZE 1125
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// Try defining some of these. They may improve performance or reliability
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// (or just plain make it work)
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// #define _CDCTL_STOP_BEFORE_PLAY
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// #define _CDCTL_START_BEFORE_PLAY
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// #define _CDCTL_SOFT_STOP
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// Define this if it stops after each track
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#define _CDCTL_SENSITIVE_EOT
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// If it still stops for a while between tracks, increase this (0-75 is a sensible range)
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#define _CDCTL_SENSITIVITY 0
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/cdio.h>
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#include <arpa/inet.h>
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#define CD_MSF_OFFSET 150
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// CD status values
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#define ssData 0
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#define ssStopped 1
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#define ssPlaying 2
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#define ssPaused 3
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#define ssNoCD 4
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#define ssTrayOpen 5
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// Audio command values
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#define acStop 0
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#define acPlay 1
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#define acPause 2
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#define acResume 3
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#define acPrev 4
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#define acNext 5
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#define acRewd 6
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#define acFFwd 7
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#define acEject 8
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#define acClose 9
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// Track selection values (what to do when I've played the requested track)
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// Note: Track selection is not perfect - so use tsNone if you want to avoid trouble.
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// Basically, if we receive a CDROM_AUDIO_COMPLETED status, then we have to decide what to do.
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// If we think the last play command was ours (Next/Prev/FFwd/Rewd don't count), then we do something,
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// depending on the current track selection mode.
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// Failures: Sometimes we may think we sent the last play command when we did not (if we didn't see play stop in
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// in between).
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// If another application is polling the status, it may receive the CDROM_AUDIO_COMPLETED we are looking
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// for, and we will not, so will think play was stopped manually.
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// Similarly, we may read the CDROM_AUDIO_COMPLETED status when we don't want it, such that the other
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// application never sees it.
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// Verdict: Linux audio cdrom handling is broken.
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// Update: New define _CDCTL_SENSITIVE_EOT may help in cases where CDROM_AUDIO_COMPLETED is not being returned
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// correctly. It may, however, interfere with other running cd players.
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// Update: I think this works like a dream now. Even with many cd players sharing a cdrom. Let me know if not!!
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#define tsNone 0 // Just stop
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#define tsRepeat 1 // Play it again
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#define tsNext 2 // Play next track (stop at end of CD)
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#define tsRepeatCD 3 // Play next track (start from first track if end is reached)
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#define tsRandom 4 // Play a track at random
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class CDCtl
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{
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public:
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CDCtl(char *dname){
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device=(char *)malloc(sizeof(char)*(strlen(dname)+1));
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strcpy(device,dname);
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srand(getpid());
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tracksel=tsRandom;
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tskOurPlay=false;
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if(cdfdopen=(cdfd=open(device,O_RDONLY | O_NONBLOCK))!=-1){
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status_state=ssNoCD;
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status_track=0;
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status_pos=0;
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cd_trklist=NULL;
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doStatus();
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readVolume();
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}
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}
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~CDCtl(){
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if(cdfdopen){
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close(cdfd);
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if(device!=NULL)
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free(device);
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if(cd_trklist!=NULL)
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free(cd_trklist);
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}
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}
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bool openOK(){
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return cdfdopen;
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}
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void doAudioCommand(int cmd){
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if(cdfdopen){
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int newtrk=status_track;
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switch(cmd){
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case acStop:
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#ifdef _CDCTL_SOFT_STOP
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ioctl(cdfd,CDIOCSTART);
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#endif
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#ifndef _CDCTL_SOFT_STOP
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ioctl(cdfd,CDIOCSTOP);
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#endif
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tskOurPlay=false;
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break;
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case acPlay:
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status_state=ssPlaying;
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select(status_track);
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tskOurPlay=true;
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break;
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case acPause:
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ioctl(cdfd,CDIOCPAUSE);
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break;
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case acResume:
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ioctl(cdfd,CDIOCRESUME);
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break;
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case acPrev:
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newtrk--;
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if(newtrk<0)
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newtrk=cd_tracks-1;
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select(newtrk);
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break;
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case acNext:
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newtrk++;
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if(newtrk>cd_tracks-1)
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newtrk=0;
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select(newtrk);
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break;
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case acRewd:
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if(status_pos>cd_trklist[status_track].track_start+_CDCTL_SKIP_SIZE){
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status_pos-=_CDCTL_SKIP_SIZE;
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play();
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}
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break;
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case acFFwd:
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if(status_pos<cd_trklist[status_track].track_start+cd_trklist[status_track].track_len-_CDCTL_SKIP_SIZE){
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status_pos+=_CDCTL_SKIP_SIZE;
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play();
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}
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break;
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case acEject:
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if(ioctl(cdfd,CDIOCEJECT))
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status_state=ssNoCD;
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else
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status_state=ssTrayOpen;
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break;
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case acClose:
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ioctl(cdfd,CDIOCCLOSE);
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status_state=ssNoCD;
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break;
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}
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doStatus();
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}
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}
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void doStatus(){
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if(cdfdopen){
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struct ioc_read_subchannel sc;
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struct cd_sub_channel_info csci;
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sc.address_format=CD_MSF_FORMAT;
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sc.track = 0;
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sc.data=&csci;
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sc.data_len=sizeof(csci);
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sc.data_format=CD_CURRENT_POSITION;
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if(ioctl(cdfd, CDIOCREADSUBCHANNEL, &sc)){
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if(status_state!=ssNoCD)
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status_state=ssTrayOpen;
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status_track=0;
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status_pos=0;
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tskOurPlay=false;
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}
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else{
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if(status_state==ssNoCD || status_state==ssTrayOpen)
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readTOC();
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int start,now,stop;
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switch(csci.header.audio_status){
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case CD_AS_PLAY_IN_PROGRESS:
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if(status_state==ssStopped)
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tskOurPlay=false;
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status_state=ssPlaying;
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break;
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case CD_AS_PLAY_PAUSED:
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if(status_state==ssStopped)
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tskOurPlay=false;
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status_state=ssPaused;
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break;
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case CD_AS_PLAY_COMPLETED:
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if(tskOurPlay){
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status_state=ssPlaying;
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selecttrack();
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doStatus();
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return;
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}
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else
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status_state=ssStopped;
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break;
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default:
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#ifdef _CDCTL_SENSITIVE_EOT
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if(tskOurPlay){
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start = cd_trklist[status_track].track_start;
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stop = start + cd_trklist[status_track].track_len - _CDCTL_SENSITIVITY;
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now = ((csci.what.position.absaddr.msf.minute) * 60 + csci.what.position.absaddr.msf.second) * 75 + csci.what.position.absaddr.msf.frame - CD_MSF_OFFSET;
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if(now>0 && (now<start || now>=stop)){
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status_state=ssPlaying;
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selecttrack();
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doStatus();
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return;
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}
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else
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status_state=ssStopped;
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}
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else
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#endif
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status_state=ssStopped;
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}
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trackinfo(&csci);
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if(cd_trklist[status_track].track_data)
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status_state=ssData;
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}
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}
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}
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void setVolume(int l, int r){
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if(cdfdopen){
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struct ioc_vol vol;
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vol.vol[0]=l;
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vol.vol[1]=r;
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vol.vol[2]=0;
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vol.vol[3]=0;
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ioctl(cdfd,CDIOCSETVOL,&vol);
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readVolume();
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}
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}
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void readVolume(){
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if(cdfdopen){
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struct ioc_vol vol;
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ioctl(cdfd,CDIOCGETVOL,&vol);
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status_volumel=vol.vol[0];
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status_volumer=vol.vol[1];
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}
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}
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int getVolumeL(){
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return status_volumel;
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}
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int getVolumeR(){
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return status_volumer;
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}
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void setTrackSelection(int ts){
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tracksel=ts;
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}
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int getTrackSelection(){
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return tracksel;
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}
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char *getDevName(){
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return device;
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}
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int getCDTracks(){
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return cd_tracks;
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}
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int getCDLen(){
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return cd_len;
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}
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int getTrackStart(int trk){
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return cd_trklist[trk-1].track_start;
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}
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int getTrackLen(int trk){
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return cd_trklist[trk-1].track_len;
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}
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bool getTrackData(int trk){
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return cd_trklist[trk-1].track_data;
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}
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int getStatusState(){
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return status_state;
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}
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int getStatusTrack(){
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return status_track+1;
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}
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int getStatusPosAbs(){
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return status_pos-cd_trklist[0].track_start;
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}
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int getStatusPosRel(){
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return status_pos-cd_trklist[status_track].track_start;
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}
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private:
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void readTOC(){
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if(cd_trklist!=NULL)
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free(cd_trklist);
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struct ioc_toc_header hdr;
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ioctl(cdfd, CDIOREADTOCHEADER, &hdr);
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cd_tracks=hdr.ending_track;
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cd_trklist=(struct CDTrack *)malloc(cd_tracks*sizeof(struct CDTrack));
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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struct ioc_read_toc_entry te;
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te.data_len = (cd_tracks + 1) * sizeof(struct cd_toc_entry);
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te.data = (struct cd_toc_entry *)malloc(te.data_len);
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te.address_format = CD_LBA_FORMAT;
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te.starting_track = 0;
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ioctl(cdfd, CDIOREADTOCENTRYS, &te);
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for(int i = 0; i < cd_tracks; i++) {
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cd_trklist[i].track_data = te.data[i].control & 4 ? true : false;
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cd_trklist[i].track_start = ntohl(te.data[i].addr.lba);
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cd_trklist[i].track_len = ntohl(te.data[i + 1].addr.lba)
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- cd_trklist[i].track_start;
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}
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cd_len = ntohl(te.data[cd_tracks].addr.lba);
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free(te.data);
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#else
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struct cdrom_tocentry te;
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int prev_addr=0;
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for(int i=0;i<=cd_tracks;i++){
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if(i==cd_tracks)
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te.cdte_track=CDROM_LEADOUT;
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else
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te.cdte_track=i+1;
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te.cdte_format=CDROM_MSF; // I think it is ok to read this as LBA, but for a quiet life...
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ioctl(cdfd, CDROMREADTOCENTRY, &te);
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int this_addr=((te.cdte_addr.msf.minute * 60) + te.cdte_addr.msf.second) * 75 + te.cdte_addr.msf.frame - CD_MSF_OFFSET;
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if(i>0)
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cd_trklist[i-1].track_len = this_addr - prev_addr - 1;
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prev_addr=this_addr;
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if(i<cd_tracks){
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cd_trklist[i].track_data = te.cdte_ctrl & CDROM_DATA_TRACK ? true : false;
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cd_trklist[i].track_start = this_addr;
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}
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else
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cd_len = this_addr;
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}
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#endif
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}
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void trackinfo(struct cd_sub_channel_info *subchnl){
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int currenttrack = status_track;
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if(status_state==ssPlaying || status_state==ssPaused){
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status_pos=((subchnl->what.position.absaddr.msf.minute) * 60 + subchnl->what.position.absaddr.msf.second) * 75 + subchnl->what.position.absaddr.msf.frame - CD_MSF_OFFSET;
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for(status_track=0;status_track<cd_tracks;status_track++){
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if(status_pos<cd_trklist[status_track].track_start+cd_trklist[status_track].track_len) {
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if (status_track != currenttrack) {
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status_track = currenttrack;
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}
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break;
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}
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}
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}
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}
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void play(){
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||
|
|
struct ioc_play_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.start_m=abs0/(75*60);
|
||
|
|
pmsf.end_m=abs1/(75*60);
|
||
|
|
pmsf.start_s=(abs0%(75*60))/75;
|
||
|
|
pmsf.end_s=(abs1%(75*60))/75;
|
||
|
|
pmsf.start_f=abs0%75;
|
||
|
|
pmsf.end_f=abs1%75;
|
||
|
|
|
||
|
|
#ifdef _CDCTL_STOP_BEFORE_PLAY
|
||
|
|
ioctl(cdfd,CDIOCSTOP);
|
||
|
|
#endif
|
||
|
|
#ifdef _CDCTL_START_BEFORE_PLAY
|
||
|
|
ioctl(cdfd,CDIOCSTART);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
ioctl(cdfd,CDIOCPLAYMSF,&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,CDIOCSTOP);
|
||
|
|
#endif
|
||
|
|
#ifndef _CDCTL_HARD_STOP
|
||
|
|
ioctl(cdfd,CDIOCSTART);
|
||
|
|
#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;
|
||
|
|
};
|