dbc223eb84
Import existing source tree; original VCS history is no longer available. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*(LGPL)
|
|
------------------------------------------------------------
|
|
a_midifile.c - MIDI file loader and player
|
|
------------------------------------------------------------
|
|
* Stolen from the AdPlug player, stripped down,
|
|
* translated into C, and adapted for the Audio Engine
|
|
* by David Olofson, 2002.
|
|
*
|
|
* 20020219: Separated data from player.
|
|
*
|
|
* 20020613: Removed code for all special formats
|
|
* and AdLib hardware specific stuff. (Can't
|
|
* use the data. Can't maintain the code.)
|
|
*
|
|
* 20020615: * Removed all 'long' types. If this engine
|
|
* is supposed to work in 16 bit environments,
|
|
* there's a *lot* more than a few longs to it.
|
|
* * Cleaned up type namespace.
|
|
* * Fixed various stuff that Splint whines about.
|
|
* * Added musical time printout function.
|
|
*
|
|
* Below is the original copyright. Of course, the LGPL
|
|
* license still applies.
|
|
------------------------------------------------------------
|
|
* Adplug - Replayer for many OPL2/OPL3 audio file formats.
|
|
* Copyright (C) 1999, 2000, 2001 Simon Peter, <dn.tlp@gmx.net>, et al.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*
|
|
* mid.h - LAA & MID & CMF Player by Philip Hassey (philhassey@hotmail.com)
|
|
*/
|
|
|
|
#ifndef _A_MIDIFILE_H_
|
|
#define _A_MIDIFILE_H_
|
|
|
|
#include "a_midisock.h"
|
|
|
|
/*----------------------------------------------------------
|
|
midi_file_t
|
|
----------------------------------------------------------*/
|
|
|
|
typedef struct midi_file_t
|
|
{
|
|
const char *author;
|
|
const char *title;
|
|
const char *remarks;
|
|
unsigned flen;
|
|
unsigned subsongs;
|
|
unsigned format;
|
|
unsigned tracks;
|
|
unsigned char *data;
|
|
} midi_file_t;
|
|
|
|
midi_file_t *mf_open(const char *name);
|
|
void mf_close(midi_file_t *mf);
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
midi_player_t
|
|
----------------------------------------------------------*/
|
|
|
|
typedef struct mp_track_context_t
|
|
{
|
|
int on;
|
|
unsigned pos;
|
|
unsigned iwait;
|
|
unsigned char pv;
|
|
} mp_track_context_t;
|
|
|
|
|
|
typedef struct mp_track_t
|
|
{
|
|
int enabled;
|
|
unsigned tend;
|
|
unsigned spos;
|
|
mp_track_context_t c;
|
|
mp_track_context_t loop_start;
|
|
} mp_track_t;
|
|
|
|
|
|
typedef struct mp_timesig_t
|
|
{
|
|
unsigned char beats;
|
|
unsigned char value;
|
|
unsigned char clock;
|
|
unsigned char qn;
|
|
} mp_timesig_t;
|
|
|
|
typedef struct mp_context_t
|
|
{
|
|
unsigned ppqn; /* Pulses Per Quarter Note */
|
|
unsigned usqtr; /* microseconds per quarter note */
|
|
float spulse; /* seconds per pulse */
|
|
mp_timesig_t timesig;
|
|
unsigned time; /* Current position in pulses */
|
|
unsigned iwait; /* Pulses to next event */
|
|
float fwait; /* Seconds to next event */
|
|
} mp_context_t;
|
|
|
|
|
|
typedef struct midi_player_t
|
|
{
|
|
midisock_t *sock;
|
|
midi_file_t *mf;
|
|
unsigned pos;
|
|
mp_context_t c;
|
|
mp_context_t loop_start;
|
|
mp_track_t track[16];
|
|
int doing;
|
|
int pitch;
|
|
} midi_player_t;
|
|
|
|
|
|
midi_player_t *mp_open(midisock_t *ms);
|
|
void mp_close(midi_player_t *mp);
|
|
|
|
/* Select a previously loaded MIDI file for playback */
|
|
int mp_select(midi_player_t *mp, midi_file_t *midifile);
|
|
|
|
/* Play all events until the next delay */
|
|
int mp_update(midi_player_t *mp);
|
|
|
|
/* Play all events until current_position + dt seconds */
|
|
int mp_play(midi_player_t *mp, float dt);
|
|
|
|
/* Rewind to start of sub song 'subsong' */
|
|
void mp_rewind(midi_player_t *mp, unsigned subsong);
|
|
|
|
void mp_stop(midi_player_t *mp);
|
|
|
|
#endif /*_A_MIDIFILE_H_*/
|