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/*
 **********************************************************************
 *     passthrough.h -- Emu10k1 digital passthrough header file
 *     Copyright (C) 2001  Juha Yrjölä <jyrjola@cc.hut.fi>
 *
 **********************************************************************
 *
 *     Date                 Author          Summary of changes
 *     ----                 ------          ------------------
 *     May 15, 2001	    Juha Yrjölä     base code release
 *
 **********************************************************************
 *
 *     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., 675 Mass Ave, Cambridge, MA 02139,
 *     USA.
 *
 **********************************************************************
 */
 
#ifndef _PASSTHROUGH_H
#define _PASSTHROUGH_H
 
#include "audio.h"
 
/* number of 16-bit stereo samples in XTRAM buffer */
#define PT_SAMPLES 0x8000
#define PT_BLOCKSAMPLES 0x400
#define PT_BLOCKSIZE (PT_BLOCKSAMPLES*4)
#define PT_BLOCKSIZE_LOG2 12
#define PT_BLOCKCOUNT (PT_SAMPLES/PT_BLOCKSAMPLES)
#define PT_INITPTR (PT_SAMPLES/2-1)
 
#define PT_STATE_INACTIVE 0
#define PT_STATE_ACTIVATED 1
#define PT_STATE_PLAYING 2
 
/* passthrough struct */
struct pt_data
{
	u8	selected, state, spcs_to_use;
	int	intr_gpr, enable_gpr, pos_gpr;
	u32	blocks_played, blocks_copied, old_spcs[3];
	u32	playptr, copyptr;
	u32	prepend_size;
	u8	*buf;
	u8	ac3data;
 
	char	*patch_name, *intr_gpr_name, *enable_gpr_name, *pos_gpr_name;
 
	wait_queue_head_t wait;
	spinlock_t lock;
};
 
ssize_t emu10k1_pt_write(struct file *file, const char *buf, size_t count);
void emu10k1_pt_stop(struct emu10k1_card *card);
void emu10k1_pt_waveout_update(struct emu10k1_wavedevice *wave_dev);
 
#endif /* _PASSTHROUGH_H */