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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.
*
* $URL$
* $Id$
*
*/
#ifndef _SFX_ITERATOR_INTERNAL_
#define _SFX_ITERATOR_INTERNAL_
#include "sci/include/sfx_iterator.h"
#include "sci/include/sci_midi.h"
/* States */
#define SI_STATE_UNINITIALISED -1
#define SI_STATE_DELTA_TIME 0 /* Now at a delta time */
#define SI_STATE_COMMAND 1 /* Now at a MIDI operation */
#define SI_STATE_PENDING 2 /* Pending for loop */
#define SI_STATE_FINISHED 3 /* End of song */
#define SI_STATE_PCM 4 /* Should report a PCM next (-> DELTA_TIME) */
#define SI_STATE_PCM_MAGIC_DELTA 5 /* Should report a ``magic'' one tick delta time next (goes on to FINISHED) */
/* Iterator types */
#define SCI_SONG_ITERATOR_TYPE_SCI0 0
#define SCI_SONG_ITERATOR_TYPE_SCI1 1
#define SIPFX __FILE__" : "
typedef struct {
int state; /* SI_STATE_* */
int offset; /* Offset into the data chunk */
int end; /* Last allowed byte in track */
int id; /* Some channel ID */
int loop_offset;
int delay; /* Number of ticks before the
** specified channel is next
** used, or
** CHANNEL_DELAY_MISSING to
** indicate that the delay has
** not yet been read */
/* Two additional offsets for recovering: */
int initial_offset;
int playmask; /* Active playmask (MIDI channels to play in here) */
int notes_played; /* #of notes played since the last loop start */
int loop_timepos; /* Total delay for this channel's loop marker */
int total_timepos; /* Number of ticks since the beginning, ignoring loops */
int timepos_increment; /* Number of ticks until the next command (to add) */
int saw_notes; /* Bitmask of channels we have currently played notes on */
byte last_cmd; /* Last operation executed, for running status */
} song_iterator_channel_t;
#define INHERITS_BASE_SONG_ITERATOR \
INHERITS_SONG_ITERATOR; /* aka "extends song iterator" */ \
\
int polyphony[MIDI_CHANNELS]; /* # of simultaneous notes on each */ \
int importance[MIDI_CHANNELS]; /* priority rating for each channel, 0 means unrated. */ \
\
\
int ccc; /* Cumulative cue counter, for those who need it */ \
unsigned char resetflag; /* for 0x4C -- on DoSound StopSound, do we return to start? */ \
int device_id; /* ID of the device we generating events for */ \
int active_channels; /* Number of active channels */ \
unsigned int size; /* Song size */ \
unsigned char *data; \
\
int loops; /* Number of loops remaining */ \
int recover_delay
typedef struct _base_song_iterator {
INHERITS_BASE_SONG_ITERATOR;
} base_song_iterator_t;
/********************************/
/*--------- SCI 0 --------------*/
/********************************/
typedef struct {
INHERITS_BASE_SONG_ITERATOR;
song_iterator_channel_t channel;
int delay_remaining; /* Number of ticks that haven't been polled yet */
} sci0_song_iterator_t;
/********************************/
/*--------- SCI 1 --------------*/
/********************************/
typedef struct _sci1_sample {
int delta; /* Time left-- initially, this is 'Sample point 1'.
** After initialisation, it is 'sample point 1 minus the sample point of the previous sample' */
int size;
int announced; /* Announced for download (SI_PCM) */
sfx_pcm_config_t format;
byte *data;
struct _sci1_sample *next;
} sci1_sample_t;
typedef struct {
INHERITS_BASE_SONG_ITERATOR;
song_iterator_channel_t channels[MIDI_CHANNELS];
/* Invariant: Whenever channels[i].delay == CHANNEL_DELAY_MISSING,
** channel_offset[i] points to a delta time object. */
int initialised; /* Whether the MIDI channel setup has been initialised */
int channels_nr; /* Number of channels actually used */
sci1_sample_t *next_sample;
int channels_looped; /* Number of channels that are ready to loop */
int delay_remaining; /* Number of ticks that haven't been polled yet */
int hold;
\
} sci1_song_iterator_t;
#define PLAYMASK_NONE 0x0
/*********************************/
/*---------- Cleanup ------------*/
/*********************************/
song_iterator_t *
new_cleanup_iterator(unsigned int channels);
/* Creates a new song iterator with the purpose of sending notes-off channel commands
** Parameters: (unsigned int) channels: Channel mask to send these commands for
** Returns : A song iterator with the aforementioned purpose
*/
int
is_cleanup_iterator(song_iterator_t *it);
/* Determines whether a given song iterator is a cleanup song iterator
** Parameters: (song_iterator_t *) it: The iterator to check
** Returns : (int) 1 iff 'it' is a cleanup song iterator
** No deep recursion/delegation is considered.
*/
/**********************************/
/*--------- Fast Forward ---------*/
/**********************************/
typedef struct {
INHERITS_SONG_ITERATOR;
song_iterator_t *delegate;
int delta; /* Remaining time */
} fast_forward_song_iterator_t;
song_iterator_t *
new_fast_forward_iterator(song_iterator_t *it, int delta);
/* Creates a new song iterator which fast-forwards
** Parameters: (song_iterator_t *) it: The iterator to wrap
** (int) delta: The number of ticks to skip
** Returns : (song_iterator_t) A newly created song iterator
** which skips all delta times
** until 'delta' has been used up
*/
/**********************************/
/*--------- Fast Forward ---------*/
/**********************************/
#define MAX_BUF_SIZE 4
#define TEE_LEFT 0
#define TEE_RIGHT 1
#define TEE_LEFT_ACTIVE (1<<0)
#define TEE_RIGHT_ACTIVE (1<<1)
#define TEE_LEFT_READY (1<<2) /* left result is ready */
#define TEE_RIGHT_READY (1<<3) /* right result is ready */
#define TEE_LEFT_PCM (1<<4)
#define TEE_RIGHT_PCM (1<<5)
#define TEE_MORPH_NONE 0 /* Not waiting to self-morph */
#define TEE_MORPH_READY 1 /* Ready to self-morph */
typedef struct {
INHERITS_SONG_ITERATOR;
int status;
int may_destroy; /* May destroy song iterators */
int morph_deferred; /* One of TEE_MORPH_* above */
struct {
song_iterator_t *it;
byte buf[MAX_BUF_SIZE];
int result;
int retval;
byte channel_remap[MIDI_CHANNELS];
/* Remapping for channels */
} children[2];
} tee_song_iterator_t;
sfx_pcm_feed_t *
sfx_iterator_make_feed(byte *base_data, int offset,
int size,
sfx_pcm_config_t conf);
/* Generates a feed for a song iterator
** Parameters: (byte *) base_data: A refcounted memory chunk containing
** (among other things) PCM data
** (int) offset; Offset into base_data
** (int) size: Number of bytes to consider
** (pcm_data_internal_t) conf: PCM encoding
*/
#endif /* !defined(_SFX_ITERATOR_INTERNAL_ */
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