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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 SCI_SFX_SFX_ITERATOR_INTERNAL
#define SCI_SFX_SFX_ITERATOR_INTERNAL
#include "sci/sfx/iterator.h"
#include "sci/sfx/sci_midi.h"
#include "common/list.h"
namespace Sci {
/* 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__" : "
struct SongIteratorChannel {
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 */
public:
void resetSynthChannels();
};
class BaseSongIterator : public SongIterator {
public:
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 */
byte resetflag; /* for 0x4C -- on DoSound StopSound, do we return to start? */
int _deviceId; /* ID of the device we generating events for */
int active_channels; /* Number of active channels */
uint _size; /* Song size */
byte *_data;
int loops; /* Number of loops remaining */
int recover_delay;
public:
BaseSongIterator(byte *data, uint size, songit_id_t id);
~BaseSongIterator();
};
/********************************/
/*--------- SCI 0 --------------*/
/********************************/
class Sci0SongIterator : public BaseSongIterator {
public:
SongIteratorChannel channel;
public:
Sci0SongIterator(byte *data, uint size, songit_id_t id);
int nextCommand(byte *buf, int *result);
Audio::AudioStream *getAudioStream();
SongIterator *handleMessage(SongIteratorMessage msg);
void init();
int getTimepos();
};
/********************************/
/*--------- SCI 1 --------------*/
/********************************/
struct Sci1Sample {
/* Time left-- initially, this is 'Sample point 1'.
* After initialisation, it is 'sample point 1 minus the sample
* point of the previous sample'
*/
int delta;
int size;
bool announced; /* Announced for download (SI_PCM) */
sfx_pcm_config_t format;
byte *_data;
};
class Sci1SongIterator : public BaseSongIterator {
public:
SongIteratorChannel _channels[MIDI_CHANNELS];
/* Invariant: Whenever channels[i].delay == CHANNEL_DELAY_MISSING,
** channel_offset[i] points to a delta time object. */
bool _initialised; /* Whether the MIDI channel setup has been initialised */
int _numChannels; /* Number of channels actually used */
Common::List<Sci1Sample> _samples;
int _numLoopedChannels; /* Number of channels that are ready to loop */
int _delayRemaining; /* Number of ticks that haven't been polled yet */
int _hold;
public:
Sci1SongIterator(byte *data, uint size, songit_id_t id);
~Sci1SongIterator();
int nextCommand(byte *buf, int *result);
Audio::AudioStream *getAudioStream();
SongIterator *handleMessage(SongIteratorMessage msg);
void init();
int getTimepos();
};
#define PLAYMASK_NONE 0x0
/**********************************/
/*--------- Fast Forward ---------*/
/**********************************/
class FastForwardSongIterator : public SongIterator {
protected:
SongIterator *_delegate;
int _delta; /**< Remaining time */
public:
FastForwardSongIterator() {} // FIXME: Temp hack
FastForwardSongIterator(SongIterator *capsit, int delta);
int nextCommand(byte *buf, int *result);
Audio::AudioStream *getAudioStream();
SongIterator *handleMessage(SongIteratorMessage msg);
int getTimepos();
};
/**********************************/
/*--------- Tee iterator ---------*/
/**********************************/
enum {
MAX_BUF_SIZE = 4,
TEE_LEFT = 0,
TEE_RIGHT = 1,
TEE_LEFT_ACTIVE = (1<<0),
TEE_RIGHT_ACTIVE = (1<<1),
TEE_LEFT_READY = (1<<2), /**< left result is ready */
TEE_RIGHT_READY = (1<<3), /**< right result is ready */
TEE_LEFT_PCM = (1<<4),
TEE_RIGHT_PCM = (1<<5),
TEE_MORPH_NONE = 0, /**< Not waiting to self-morph */
TEE_MORPH_READY = 1 /**< Ready to self-morph */
};
class TeeSongIterator : public SongIterator {
public:
int _status;
int morph_deferred; /* One of TEE_MORPH_* above */
struct {
SongIterator *it;
byte buf[MAX_BUF_SIZE];
int result;
int retval;
byte channel_remap[MIDI_CHANNELS];
/* Remapping for channels */
} _children[2];
public:
~TeeSongIterator();
int nextCommand(byte *buf, int *result);
Audio::AudioStream *getAudioStream();
SongIterator *handleMessage(SongIteratorMessage msg);
void init();
int getTimepos() { return 0; }
};
} // End of namespace Sci
#endif // SCI_SFX_SFX_ITERATOR_INTERNAL
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