/*
 * $Id: plat_irix.c,v 1.3 1997/12/08 22:07:32 dirk Exp $
 *
 * This file is part of WorkMan, the civilized CD player program
 * (c) 1991-1997 by Steven Grimm (original author)
 * (c) by Dirk F"orsterling (current 'author' = maintainer)
 * The maintainer can be contacted by his e-mail address:
 * milliByte@DeathsDoor.com 
 *
 * 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.
 *
 * IRIX specific.
 *
 * Taken from the kscd distribution
 *
 * Paul Kendall
 * paul@orion.co.nz, or
 * paul@kcbbs.gen.nz
 */

#ifdef sgi
 
static char plat_irix_id[] = "$Id: plat_irix.c,v 1.3 1997/12/08 22:07:32 dirk Exp $";

/*
 * Yes, it was designed for WorkMan 1.4b3
 * Because I did start over from 1.3a, I disable it here.
 * There is no guarantee of getting working code by defining
 * CDDA yourself.
 *
 */
#undef CDDA
/*#define CDDA*/

#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sigfpe.h>
#include <dmedia/cdaudio.h>
#include <dmedia/audio.h>
#include <errno.h>

#include "struct.h"
#include "config.h"
#include "proto.h"

void *malloc();
char *strchr();

int	min_volume = 0;
int	max_volume = 255;

extern char	*cd_device;

#ifdef CDDA
static int playing = STOPPED;
static CDPLAYER *icd;
static CDPARSER *icdp;
static CDFRAME cdbuf[12];
static ALport audioport;
static ALconfig aconfig;
static struct itimerval audiotimer = { {0,0}, {0,25000} };
static int cdtrack=0;
static int cdframe=0;
static int cdstopframe=0;

cbprognum(void *arg, CDDATATYPES type, CDPROGNUM* prognum)
{
	cdtrack = prognum->value;
}

cbabstime(void *arg, CDDATATYPES type, struct cdtimecode* atime)
{
	cdframe = CDtctoframe(atime);
	if( cdframe == cdstopframe )
		playing = STOPPED;
}

cbplayaudio(void *arg, CDDATATYPES type, short* audio)
{
	if(playing != PLAYING) return;
	ALwritesamps(audioport, audio, CDDA_NUMSAMPLES);
}

static void alarmsignal()
{
	int n, i;
	if(playing != PLAYING) return;
	if( ALgetfilled(audioport) < CDDA_NUMSAMPLES*8 ) {
		/* Only get more samples and play them if we're getting low
		 * this ensures that the CD stays close to the sound
		 */
		n = CDreadda(icd, cdbuf, 12);
		if( n == 0 ) return;
		for( i=0 ; i<12 ; i++ )
			CDparseframe(icdp, &cdbuf[i]);
	}
	signal(SIGALRM, alarmsignal);
	setitimer(ITIMER_REAL, &audiotimer, NULL);
}
#endif

/*--------------------------------------------------------*
 * Initialize the drive.  A no-op for the generic driver.
 *--------------------------------------------------------*/
int
gen_init( struct wm_drive *d )
{
#ifdef CDDA
	long Param[4];
	/* Set the audio rate to 44100Hz 16bit 2s-comp stereo */
	aconfig = ALnewconfig();
	ALsetwidth(aconfig, AL_SAMPLE_16);
	ALsetsampfmt(aconfig, AL_SAMPFMT_TWOSCOMP);
	ALsetchannels(aconfig, 2);
	Param[0] = AL_OUTPUT_RATE;      Param[1] = AL_RATE_44100;
	Param[2] = AL_CHANNEL_MODE;     Param[3] = AL_STEREO;
	ALsetparams(AL_DEFAULT_DEVICE, Param, 4);
	audioport = ALopenport("KDE KSCD Audio", "w", aconfig);

	/* setup cdparser */
	icdp = CDcreateparser();
	CDaddcallback(icdp, cd_audio, (CDCALLBACKFUNC)cbplayaudio, 0);
	CDaddcallback(icdp, cd_pnum, (CDCALLBACKFUNC)cbprognum, 0);
	CDaddcallback(icdp, cd_atime, (CDCALLBACKFUNC)cbabstime, 0);

	/* Lets handle those floating point exceptions expeditiously. */
	sigfpe_[_UNDERFL].repls = _ZERO;
	handle_sigfpes(_ON, _EN_UNDERFL, NULL, _ABORT_ON_ERROR, NULL);
#endif
	return 0;
}

/*-------------------------------------*
 * Get the number of tracks on the CD.
 *-------------------------------------*/
int
gen_get_trackcount( struct wm_drive *d, int *tracks )
{
	CDSTATUS s;
	if( CDgetstatus(d->daux, &s)==0 )
		return -1;
	*tracks = s.last;
	return 0;
}

/*---------------------------------------------------------*
 * Get the start time and mode (data or audio) of a track.
 *---------------------------------------------------------*/
int
gen_get_trackinfo( struct wm_drive *d, int track, int *data, int *startframe)
{
	CDTRACKINFO i;
	int ret = CDgettrackinfo(d->daux, track, &i);
	if( ret == 0 )
		return -1;
	*data = 0;
	*startframe = CDmsftoframe(i.start_min,i.start_sec,i.start_frame);
	return 0;
}

/*-------------------------------------*
 * Get the number of frames on the CD.
 *-------------------------------------*/
int
gen_get_cdlen( struct wm_drive *d, int *frames )
{
	CDSTATUS s;
	if( CDgetstatus(d->daux, &s)==0 )
		return -1;
	*frames = CDmsftoframe(s.total_min,s.total_sec,s.total_frame);
	return 0;
}

/*--------------------------------------------------------------------------*
 * Get the current status of the drive: the current play mode, the absolute
 * position from start of disc (in frames), and the current track and index
 * numbers if the CD is playing or paused.
 *--------------------------------------------------------------------------*/
int
gen_get_drive_status( struct wm_drive *d, enum cd_modes oldmode,
                      enum cd_modes *mode, int *pos, int *track,
                      int *index )
{
#ifdef CDDA
	*mode = playing;
	*track = cdtrack;
	*pos = cdframe;
	*index = 0;
#else
	CDSTATUS s;
	if( CDgetstatus(d->daux, &s)==0 )
		return -1;
	*pos = CDmsftoframe(s.min,s.sec,s.frame);
	*track = s.track;
	*index = 0;
	switch( s.state )
	{
		case CD_READY:	*mode = STOPPED;
						break;
		case CD_STILL:
		case CD_PAUSED: *mode = PAUSED;
						break;
		case CD_PLAYING: *mode = PLAYING;
						break;
		default:		*mode = UNKNOWN;
	}
#endif
	return 0;
}

/*---------------------------------------------------------------------*
 * Set the volume level for the left and right channels.  Their values
 * range from 0 to 100.
 *---------------------------------------------------------------------*/
int
gen_set_volume( struct wm_drive *d, int left, int right )
{
	long Param[4];
	Param[0] = AL_LEFT_SPEAKER_GAIN;      Param[1] = left*255/100;
	Param[2] = AL_RIGHT_SPEAKER_GAIN;     Param[3] = right*255/100;
	ALsetparams(AL_DEFAULT_DEVICE, Param, 4);
	return 0;
}

/*---------------------------------------------------------------------*
 * Read the initial volume from the drive, if available.  Each channel
 * ranges from 0 to 100, with -1 indicating data not available.
 *---------------------------------------------------------------------*/
int
gen_get_volume( struct wm_drive *d, int *left, int *right )
{
	long Param[4];
	Param[0] = AL_LEFT_SPEAKER_GAIN;      Param[1] = 0;
	Param[2] = AL_RIGHT_SPEAKER_GAIN;     Param[3] = 0;
	ALgetparams(AL_DEFAULT_DEVICE, Param, 4);
	*left = Param[1] * 100 / 255;
	*right = Param[3] * 100 / 255;
	return 0;
}

/*---------------*
 * Pause the CD.
 *---------------*/
int
gen_pause( struct wm_drive *d )
{
#ifdef CDDA
	playing = PAUSED;
#else
    CDSTATUS s;
    if( CDgetstatus(d->daux, &s)==0 )
        return -1;
    if(s.state == CD_PLAYING)
	    CDtogglepause(d->daux);
#endif
	return 0;
}

/*-------------------------------------------------*
 * Resume playing the CD (assuming it was paused.)
 *-------------------------------------------------*/
int
gen_resume( struct wm_drive *d )
{
#ifdef CDDA
	playing = PLAYING;
	signal(SIGALRM, alarmsignal);
	setitimer(ITIMER_REAL, &audiotimer, NULL);
#else
    CDSTATUS s;
    if( CDgetstatus(d->daux, &s)==0 )
        return -1;
    if(s.state == CD_PAUSED)
	    CDtogglepause(d->daux);
#endif
	return 0;
}

/*--------------*
 * Stop the CD.
 *--------------*/
int
gen_stop( struct wm_drive *d )
{
#ifdef CDDA
	playing = STOPPED;
#else
	CDstop(d->daux);
#endif
	return 0;
}

/*------------------------------------------------------------*
 * Play the CD from one position to another (both in frames.)
 *------------------------------------------------------------*/
int
gen_play( struct wm_drive *d, int start, int end )
{
#ifdef CDDA
	int m, s, f;
	CDframetomsf(start, &m, &s, &f);
	CDseek(icd, m, s, f);
	cdstopframe = end;
	playing = PLAYING;
	signal(SIGALRM, alarmsignal);
	setitimer(ITIMER_REAL, &audiotimer, NULL);
#else
	int m, s, f;
	CDframetomsf(start, &m, &s, &f);
	CDplayabs(d->daux, m, s, f, 1);
#endif
	return 0;
}

/*----------------------------------------*
 * Eject the current CD, if there is one.
 *----------------------------------------*/
int
gen_eject( struct wm_drive *d )
{
#ifdef CDDA
	playing = STOPPED;
#endif
	CDeject(d->daux);
	return 0;
}

/*-------------------------------------------------------------*
 * Open the CD and figure out which kind of drive is attached.
 *-------------------------------------------------------------*/
int
wmcd_open( struct wm_drive *d )
{
	int	fd;
	CDSTATUS s;

	if (d->fd < 0)		/* Device already open? */
	{
		if (cd_device == NULL)
			cd_device = DEFAULT_CD_DEVICE;

		d->fd = 1;

		/* Now fill in the relevant parts of the wm_drive structure. */
		fd = d->fd;
		*d = *(find_drive_struct("", "", ""));
		d->fd = fd;
		(d->init)(d);

		d->daux = CDopen(cd_device,"r");
		if (d->daux == 0)
		{
			perror(cd_device);
			exit(1);
		}
#ifdef CDDA
		icd = d->daux;
#endif
	}

	CDgetstatus(d->daux, &s);
	if( s.state==CD_NODISC || s.state==CD_ERROR )
		return 1;

	return (0);
}

void
keep_cd_open( void ) { }

/*----------------------------------*
 * Send a SCSI command out the bus.
 *----------------------------------*/
int 
wm_scsi(d, xcdb, cdblen, retbuf, retbuflen, getreply)
	struct wm_drive *d;
	unsigned char *xcdb;
	int cdblen;
	int getreply;
	char *retbuf;
	int retbuflen;
{
	return -1;
}

#endif

