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Aminet AMIGA CDROM (1994)(Walnut Creek)[Feb 1994][W.O. 44790-1].iso
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tracker_3_19.lzh
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player.c
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C/C++ Source or Header
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1993-11-19
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9KB
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436 lines
/* player.c */
/* $Id: player.c,v 3.17 1993/11/19 14:27:06 espie Exp espie $
* $Log: player.c,v $
* Revision 3.17 1993/11/19 14:27:06 espie
* Stupid bug.
*
* Revision 3.16 1993/11/17 15:31:16 espie
* New high-level functions.
*
* Revision 3.15 1993/11/11 20:00:03 espie
* Amiga support.
*
* Revision 3.14 1993/08/04 11:34:33 espie
* *** empty log message ***
*
* Revision 3.13 1993/07/18 11:49:29 espie
* Bug with delay_pattern: can't factorize the check for effect thingy.
*
* Revision 3.12 1993/07/18 10:39:44 espie
* Added forking under unix.
*
*
* Revision 3.10 1993/05/09 14:06:03 espie
* Reniced verbose output display.
*
* Revision 3.9 1993/04/25 14:08:15 espie
* Bug fix: now use correct finetune when loading samples/starting notes.
*
* Revision 3.8 1993/01/15 14:00:28 espie
* Added bg/fg test.
*
* Revision 3.6 1992/11/27 10:29:00 espie
* General cleanup
*
* Revision 3.5 1992/11/24 10:51:19 espie
* un#ifdef'ed showseq code.
*
* Revision 3.3 1992/11/22 17:20:01 espie
* Added <> operators.
* Added update frequency on the fly.
*
* Revision 3.2 1992/11/20 14:53:32 espie
* Added finetune.
*
* Revision 3.1 1992/11/19 20:44:47 espie
* Protracker commands.
*
* Revision 3.0 1992/11/18 16:08:05 espie
* New release.
*
* Revision 2.19 1992/11/17 17:15:37 espie
* Added interface using may_getchar(). Still primitive, though.
* imask, start.
* Added transpose feature.
* Added possibility to get back to MONO for the sgi.
* Added stereo capabilities to the indigo version.
* Added two level of fault tolerancy.
* Added some control on the number of replays,
* and better error recovery.
*/
#include <stdio.h>
#include "defs.h"
#include "extern.h"
#include "song.h"
#include "channel.h"
#include "pref.h"
LOCAL char *id = "$Id: player.c,v 3.17 1993/11/19 14:27:06 espie Exp espie $";
/* setting up a given note */
void reset_note(ch, note, pitch)
struct channel *ch;
int note;
int pitch;
{
/*
ch->pointer = 0;
ch->mode = PLAY;
set_current_pitch(ch, pitch);
*/
ch->pitch = pitch;
ch->note = note;
ch->viboffset = 0;
play_note(ch->audio, ch->samp, pitch);
}
/* changing the current pitch (value
* may be temporary, and not stored
* in channel pitch, for instance vibratos.
*/
void set_current_pitch(ch, pitch)
struct channel *ch;
int pitch;
{
/* save current pitch in case we want to change
* the step table on the run
ch->cpitch = pitch;
ch->step = step_table[pitch];
*/
set_play_pitch(ch->audio, pitch);
}
/* changing the current volume. You HAVE to get through
* there so that it will work on EVERY machine.
*/
void set_current_volume(ch, volume)
struct channel *ch;
int volume;
{
ch->volume = MAX(MIN(volume, MAX_VOLUME), MIN_VOLUME);
set_play_volume(ch->audio, volume);
}
void set_position(ch, pos)
struct channel *ch;
int pos;
{
set_play_position(ch->audio, pos);
/*
ch->pointer = int_to_fix(pos);
*/
}
/* init_channel(ch, dummy):
* setup channel, with initially
* a dummy sample ready to play,
* and no note.
*/
LOCAL void init_channel(ch)
struct channel *ch;
{
ch->samp = NULL;
ch->finetune = 0;
ch->audio = new_channel();
ch->volume = 0;
ch->pitch = 0;
ch->note = NO_NOTE;
/* we don't setup arpeggio values. */
ch->viboffset = 0;
ch->vibdepth = 0;
ch->slide = 0;
ch->pitchgoal = 0;
ch->pitchrate = 0;
ch->volumerate = 0;
ch->vibrate = 0;
ch->adjust = do_nothing;
}
LOCAL int VSYNC; /* base number of sample to output */
void (*eval[NUMBER_EFFECTS])();
/* the effect table */
LOCAL int oversample; /* oversample value */
LOCAL int frequency; /* output frequency */
LOCAL int channel; /* channel loop counter */
LOCAL struct channel chan[NUMBER_TRACKS];
/* every channel */
LOCAL int countdown; /* keep playing the tune or not */
LOCAL struct song_info *info;
LOCAL struct sample_info *voices;
LOCAL struct automaton a;
void init_player(o, f)
int o, f;
{
oversample = o;
frequency = f;
init_tables(o, f, NULL);
init_effects(eval);
init_display();
}
LOCAL void setup_effect(ch, a, e, imask, bcdvol)
struct channel *ch;
struct automaton *a;
struct event *e;
unsigned long imask;
int bcdvol;
{
int samp, cmd;
/* retrieves all the parameters */
samp = e->sample_number;
/* load new instrument */
if (samp)
{
/* note that we can change sample in the middle
* of a note. This is a *feature*, not a bug (see
* made). Precisely: the sampel change will be taken
* into account for the next note, BUT the volume change
* takes effect immediately.
*/
ch->samp = voices + samp;
ch->finetune = voices[samp].finetune;
if ((1L<<samp) & imask)
ch->samp = voices;
set_current_volume(ch, voices[samp].volume);
}
a->note = e->note;
if (a->note != NO_NOTE)
a->pitch = pitch_table[a->note][ch->finetune];
else
a->pitch = e->pitch;
cmd = e->effect;
a->para = e->parameters;
if (a->pitch >= MAX_PITCH)
{
fprintf(stderr, "Pitch out of bounds %d\n", a->pitch);
a->pitch = 0;
error = FAULT;
}
if (show && run_in_fg())
dump_event(ch, e, imask);
/* check for a new note: portamento
* is the special case where we do not restart
* the note.
*/
if (a->pitch && cmd != EFF_PORTA && cmd != EFF_PORTASLIDE)
reset_note(ch, a->note, a->pitch);
ch->adjust = do_nothing;
/* do effects */
(eval[cmd])(a, ch);
}
LOCAL void adjust_sync(ofreq, tempo)
int ofreq, tempo;
{
VSYNC = ofreq * NORMAL_FINESPEED / tempo;
}
LOCAL void play_once(a, pref)
struct automaton *a;
struct pref *pref;
{
int channel;
if (a->do_stuff & DELAY_PATTERN)
for (channel = 0; channel < NUMBER_TRACKS; channel++)
/* do the effects */
(chan[channel].adjust)(chan + channel);
else
{
if (a->counter == 0)
for (channel = 0; channel < NUMBER_TRACKS; channel++)
/* setup effects */
setup_effect(chan + channel, a,
&(a->pattern->e[channel][a->note_num]),
pref->imask, pref->bcdvol);
else
for (channel = 0; channel < NUMBER_TRACKS; channel++)
/* do the effects */
(chan[channel].adjust)(chan + channel);
}
/* advance player for the next tick */
next_tick(a);
/* actually output samples */
resample(chan, oversample, VSYNC / a->finespeed);
}
void play_song(song, pref, start)
struct song *song;
struct pref *pref;
int start;
{
int tempo;
tempo = pref->speed;
adjust_sync(frequency, tempo);
/* a repeats of 0 is infinite replays */
if (pref->repeats)
countdown = pref->repeats;
else
countdown = 1;
info = &song->info;
voices = song->samples;
init_automaton(&a, song, start);
no_audio_channels();
for (channel = 0; channel < NUMBER_TRACKS; channel++)
init_channel(chan + channel);
while(countdown)
{
play_once(&a, pref);
switch(may_getchar())
{
case 'n':
#ifdef FORKING
if (forked)
break;
forked = TRUE;
if (pid = fork())
{
nice(15);
error = NEXT_SONG;
return;
}
else
break;
#else
discard_buffer();
error = NEXT_SONG;
return;
#endif
case 'p':
#ifdef FORKING
if (forked)
break;
forked = TRUE;
if (pid = fork())
{
nice(15);
error = PREVIOUS_SONG;
return;
}
else
break;
#else
discard_buffer();
error = PREVIOUS_SONG;
return;
#endif
case 'x':
case 'e':
case 'q':
discard_buffer();
end_all();
case 's':
tempo = 50;
adjust_sync(frequency, tempo);
break;
case 'S':
tempo = 60;
adjust_sync(frequency, tempo);
break;
case 'r':
discard_buffer();
init_automaton(&a, song, start);
no_audio_channels();
for (channel = 0; channel < NUMBER_TRACKS; channel++)
init_channel(chan + channel);
break;
case '>':
discard_buffer();
init_automaton(&a, song, a.pattern_num+1);
break;
case '<':
discard_buffer();
if (a.note_num < 4)
init_automaton(&a, song, a.pattern_num -1);
else
init_automaton(&a, song, a.pattern_num);
break;
case '?':
dump_song(song);
show = TRUE;
break;
case '!':
show = FALSE;
break;
case ' ':
while (may_getchar() == EOF)
;
break;
default:
break;
}
{
int new_freq;
if (new_freq = update_frequency())
{
frequency = new_freq;
adjust_sync(frequency, tempo);
init_tables(oversample, frequency, chan);
}
}
switch(error)
{
case NONE:
break;
case ENDED:
if (pref->repeats)
countdown--;
break;
case SAMPLE_FAULT:
if (!pref->tolerate)
countdown = 0;
break;
case FAULT:
if (pref->tolerate < 2)
countdown = 0;
break;
case PREVIOUS_SONG:
case NEXT_SONG:
case UNRECOVERABLE:
countdown = 0;
break;
default:
break;
}
error = NONE;
}
}