/***************************************************************************
 sfx_softseq.h  Copyright (C) 2004 Christoph Reichenbach


 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public Licence as
 published by the Free Software Foundaton; either version 2 of the
 Licence, or (at your option) any later version.

 It is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 merchantibility or fitness for a particular purpose. See the
 GNU General Public Licence for more details.

 You should have received a copy of the GNU General Public Licence
 along with this program; see the file COPYING. If not, write to
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.


 Please contact the maintainer for any program-related bug reports or
 inquiries.

 Current Maintainer:

    Christoph Reichenbach (CR) <jameson@linuxgames.com>

***************************************************************************/

#ifndef SFX_SOFTSEQ_H_
#define SFX_SOFTSEQ_H_

#include "sci/include/sfx_core.h"
#include "sci/include/sfx_pcm.h"
#include "sci/sfx/sequencer.h"
#include "sci/include/resource.h"


/* Software sequencer */
typedef struct sfx_softseq {
	const char *name;
	const char *version;

	int
	(*set_option)(struct sfx_softseq *self, char *name, char *value);
	/* Sets an option for the sequencer
	** Parameters: (sfx_softseq_t *) self: Self reference
	**             (char *) name: Name of the option to set
	**             (char *0 value: Value to set the option to
	** Returns   : (int) GFX_OK on success, or GFX_ERROR if not supported
	*/

	int
	(*init)(struct sfx_softseq *self, byte *res_data, int res_size,
		byte *res2_data, int res2_size);
	/* Initialises the sequencer
	** Parameters: (sfx_softseq_t *) self: Self reference
	**             (byte *) res_data: Resource data for 'patch_nr' (see below)
	**             (int) res_size: Number of bytes in 'res_data'
	**             (byte *) res2_data: Resource data for 'patch2_nr' (see below)
	**             (int) res2_size: Number of bytes in 'res2_data'
	** Returns   : (int) SFX_OK on success, SFX_ERROR otherwise
	** Note that 'res_data' is only a valid pointer for this call. If the
	** data is needed later during execution, it should be backed up internally.
	** If the requested resource is not available, res_data will be NULL
	** /even if/ patch_nr is set.
	*/

	void
	(*exit)(struct sfx_softseq *self);
	/* Uninitialises the sequencer and frees all used resources
	** Parameters: (sfx_softseq_t *) self: Self reference
	*/

	void
	(*set_volume)(struct sfx_softseq *self, int new_volume);
	/* Sets the sequencer volume
	** Parameters: (sfx_softseq_t *) self: Self reference
	**             (int) new_volume: A volume, between 0 (quiet) and 127 (max)
	*/

	void
	(*handle_command)(struct sfx_softseq *self, byte cmd, int argc, byte *argv);
	/* Handle a MIDI command
	** Parameters: (sfx_softseq_t *) self: Self reference
	**             (byte) cmd: Basic MIDI command, always includes command and channel
	**             (int) argc: Number of additional arguments to this command
	**             (byte *) argv: Additional arguments to 'cmd'
	*/

	void
	(*poll)(struct sfx_softseq *self, byte *dest, int len);
	/* Asks the software sequencer to fill in parts of a buffer
	** Parameters: (sfx_softseq_t *) self: Self reference
	**             (int) len: Number of _frames_ to write
	** Returns   : (byte) *dest: 'len' frames must be written to this buffer
	*/

	void
	(*allstop)(struct sfx_softseq *self);
	/* Stops all sound generation
	** Parameters: (sfx_softseq_t *) self: Self reference
	*/

	void *internal; /* Internal data, may be used by sfx_softseq_t inmplementors */

	int patch_nr; /* Number of the first patch file associated with this sequencer,
		      ** or SFX_SEQ_PATCHFILE_NONE  */
	int patch2_nr; /* Number of the second patch file associated with this sequencer,
		      ** or SFX_SEQ_PATCHFILE_NONE  */
	int playmask; /* playflag identifying the device emulated */
	/* 0x01	-- MT-32
	** 0x02	-- Yamaha FB-01
	** 0x04	-- CMS or Game Blaster
	** 0x08	-- Casio MT540 or CT460
	** 0x10	-- Tandy 3-voice
	** 0x20 -- PC speaker
	*/
	int play_rhythm; /* Whether the rhythm channel (9) should be played */
	int polyphony; /* Number of voices played */

	sfx_pcm_config_t pcm_conf; /* Setup of the channel the sequencer writes to */

} sfx_softseq_t;


sfx_softseq_t *
sfx_find_softseq(char *name);
/* Finds a given or default software sequencer
** Parameters: (char *) name: Name of the sequencer to look up, or NULL for default
** Returns   : (sfx_softseq_t *) The requested sequencer, or NULL if not found 
*/

#endif /* !defined(SFX_SOFTSEQ_H_) */