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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/* Song library */
#ifndef _SCI_SFX_SONGLIB_H_
#define _SCI_SFX_SONGLIB_H_
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "sci/include/scitypes.h"
#include "sci/include/sfx_iterator.h"
#define SOUND_STATUS_STOPPED 0
#define SOUND_STATUS_PLAYING 1
#define SOUND_STATUS_SUSPENDED 2
/* suspended: only if ordered from kernel space */
#define SOUND_STATUS_WAITING 3
/* "waiting" means "tagged for playing, but not active right now" */
typedef unsigned long song_handle_t;
typedef enum {
RESTORE_BEHAVIOR_CONTINUE, /* restart a song when restored from
a saved game */
RESTORE_BEHAVIOR_RESTART /* continue it from where it was */
} RESTORE_BEHAVIOR;
typedef struct _song {
song_handle_t handle;
int resource_num; /* Resource number */
int priority; /* Song priority (more important if priority is higher) */
int status; /* See above */
int restore_behavior;
int restore_time;
/* Grabbed from the sound iterator, for save/restore purposes */
int loops;
int hold;
song_iterator_t *it;
long delay; /* Delay before accessing the iterator, in microseconds */
GTimeVal wakeup_time; /* Used by the sound core:
** Playing -> time at which 'delay' has elapsed
** Suspended/Waiting -> stopping time */
struct _song *next; /* Next song or NULL if this is the last one */
struct _song *next_playing; /* Next playing song; used by the
** core song system */
struct _song *next_stopping; /* Next song pending stopping; used exclusively by
** the core song system's _update_multi_song() */
} song_t;
typedef struct {
song_t **lib;
song_t *_s;
} songlib_t;
/**************************/
/* Song library commands: */
/**************************/
song_t *
song_new(song_handle_t handle, song_iterator_t *it, int priority);
/* Initializes a new song
** Parameters: (song_handle_t) handle: The sound handle
** (song_iterator_t *) it: The song
** (int) priority: The song's priority
** Returns : (song_t *) A freshly allocated song
** Other values are set to predefined defaults.
*/
void
song_lib_init(songlib_t *songlib);
/* Initializes a static song library
** Parameters: (songlib_t *) songlib: Pointer to the library
** to initialize
** Returns : (void)
*/
void
song_lib_free(songlib_t songlib);
/* Frees a song library
** Parameters: (songlib_t) songlib: The library to free
** Returns : (void)
*/
void
song_lib_add(songlib_t songlib, song_t *song);
/* Adds a song to a song library.
** Parameters: (songlib_t) songlib: An existing sound library, or NULL
** (song_t *) song: The song to add
** Returns : (void)
*/
song_t *
song_lib_find(songlib_t songlib, song_handle_t handle);
/* Looks up the song with the specified handle
** Parameters: (songlib_t) songlib: An existing sound library, may point to NULL
** (song_handle_t) handle: The sound handle to look for
** Returns : (song_t *) The song or NULL if it wasn't found
*/
song_t *
song_lib_find_active(songlib_t songlib);
/* Finds the first song playing with the highest priority
** Parameters: (songlib_t) songlib: An existing sound library
** Returns : (song_t *) The song that should be played next, or NULL if there is none
*/
song_t *
song_lib_find_next_active(songlib_t songlib, song_t *song);
/* Finds the next song playing with the highest priority
** Parameters: (songlib_t) songlib: The song library to operate on
** (song_t *) song: A song previously returned from the song library
** Returns : (song_t *) The next song to play relative to 'song', or
** NULL if none are left
** The functions 'song_lib_find_active' and 'song_lib_find_next_active
** allow to iterate over all songs that satisfy the requirement of
** being 'playable'.
*/
int
song_lib_remove(songlib_t songlib, song_handle_t handle);
/* Removes a song from the library
** Parameters: (songlib_t) songlib: An existing sound library
** (song_handle_t) handle: Handle of the song to remove
** Returns : (int) The status of the song that was removed
*/
void
song_lib_resort(songlib_t songlib, song_t *song);
/* Removes a song from the library and sorts it in again; for use after renicing
** Parameters: (songlib_t) songlib: An existing sound library
** (song_t *) song: The song to work on
** Returns : (void)
*/
int
song_lib_count(songlib_t songlib);
/* Counts the number of songs in a song library
** Parameters: (songlib_t) songlib: The library to count
** Returns : (int) The number of songs
*/
GTimeVal
song_sleep_time(GTimeVal *lastslept, long ticks);
/* Caluculates the amount of seconds and microseconds to sleep.
** Parameters: (GTimeVal *) lastslept: The time to start counting on
** (long) ticks: Number of ticks to sleep
** Returns : (GTimeVal) The amount of time to sleep
*/
GTimeVal
song_next_wakeup_time(GTimeVal *lastslept, long ticks);
/* Calculates the time at which "ticks" have passed, counting from "lastslept".
** Parameters: (GTimeVal *) lastslept: The base to start counting on
** (long) ticks: Number of ticks to count
** Returns : (GTimeVal) A structure describing the time at which the
** specified number of ticks has passed
*/
void
song_lib_set_restore_behavior(songlib_t songlib, song_handle_t handle,
RESTORE_BEHAVIOR action);
/* Determines what should be done with the song "handle" when
** restoring it from a saved game.
** Parameters: (songlib_t) songlib: The library that contains the song
** (song_handle_t) handle: Its handle
** (RESTORE_BEHAVIOR) action: The desired action
*/
#endif /* !_SCI_SOUND_SERVER_H_ */
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