558 lines
12 KiB
C
558 lines
12 KiB
C
/*
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TiMidity -- Experimental MIDI to WAVE converter
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Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the Perl Artistic License, available in COPYING.
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mix.c */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "SDL.h"
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#include "timidity.h"
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#include "options.h"
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#include "instrum.h"
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#include "playmidi.h"
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#include "output.h"
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#include "tables.h"
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#include "resample.h"
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#include "mix.h"
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/* Returns 1 if envelope runs out */
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int recompute_envelope(MidiSong *song, int v)
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{
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int stage;
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stage = song->voice[v].envelope_stage;
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if (stage>5)
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{
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/* Envelope ran out. */
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song->voice[v].status = VOICE_FREE;
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return 1;
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}
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if (song->voice[v].sample->modes & MODES_ENVELOPE)
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{
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if (song->voice[v].status==VOICE_ON || song->voice[v].status==VOICE_SUSTAINED)
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{
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if (stage>2)
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{
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/* Freeze envelope until note turns off. Trumpets want this. */
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song->voice[v].envelope_increment=0;
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return 0;
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}
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}
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}
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song->voice[v].envelope_stage=stage+1;
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if (song->voice[v].envelope_volume==song->voice[v].sample->envelope_offset[stage] ||
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(stage > 2 && song->voice[v].envelope_volume <
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song->voice[v].sample->envelope_offset[stage]))
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return recompute_envelope(song, v);
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song->voice[v].envelope_target = song->voice[v].sample->envelope_offset[stage];
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song->voice[v].envelope_increment = song->voice[v].sample->envelope_rate[stage];
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if (song->voice[v].envelope_target < song->voice[v].envelope_volume)
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song->voice[v].envelope_increment = -song->voice[v].envelope_increment;
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return 0;
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}
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void apply_envelope_to_amp(MidiSong *song, int v)
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{
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float lamp = song->voice[v].left_amp, ramp;
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Sint32 la,ra;
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if (song->voice[v].panned == PANNED_MYSTERY)
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{
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ramp = song->voice[v].right_amp;
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if (song->voice[v].tremolo_phase_increment)
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{
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lamp *= song->voice[v].tremolo_volume;
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ramp *= song->voice[v].tremolo_volume;
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}
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if (song->voice[v].sample->modes & MODES_ENVELOPE)
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{
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lamp *= (float)vol_table[song->voice[v].envelope_volume>>23];
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ramp *= (float)vol_table[song->voice[v].envelope_volume>>23];
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}
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la = (Sint32)FSCALE(lamp,AMP_BITS);
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if (la>MAX_AMP_VALUE)
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la=MAX_AMP_VALUE;
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ra = (Sint32)FSCALE(ramp,AMP_BITS);
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if (ra>MAX_AMP_VALUE)
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ra=MAX_AMP_VALUE;
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song->voice[v].left_mix = la;
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song->voice[v].right_mix = ra;
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}
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else
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{
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if (song->voice[v].tremolo_phase_increment)
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lamp *= song->voice[v].tremolo_volume;
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if (song->voice[v].sample->modes & MODES_ENVELOPE)
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lamp *= (float)vol_table[song->voice[v].envelope_volume>>23];
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la = (Sint32)FSCALE(lamp,AMP_BITS);
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if (la>MAX_AMP_VALUE)
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la=MAX_AMP_VALUE;
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song->voice[v].left_mix = la;
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}
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}
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static int update_envelope(MidiSong *song, int v)
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{
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song->voice[v].envelope_volume += song->voice[v].envelope_increment;
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/* Why is there no ^^ operator?? */
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if (((song->voice[v].envelope_increment < 0) &&
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(song->voice[v].envelope_volume <= song->voice[v].envelope_target)) ||
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((song->voice[v].envelope_increment > 0) &&
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(song->voice[v].envelope_volume >= song->voice[v].envelope_target)))
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{
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song->voice[v].envelope_volume = song->voice[v].envelope_target;
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if (recompute_envelope(song, v))
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return 1;
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}
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return 0;
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}
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static void update_tremolo(MidiSong *song, int v)
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{
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Sint32 depth = song->voice[v].sample->tremolo_depth << 7;
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if (song->voice[v].tremolo_sweep)
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{
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/* Update sweep position */
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song->voice[v].tremolo_sweep_position += song->voice[v].tremolo_sweep;
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if (song->voice[v].tremolo_sweep_position >= (1 << SWEEP_SHIFT))
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song->voice[v].tremolo_sweep=0; /* Swept to max amplitude */
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else
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{
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/* Need to adjust depth */
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depth *= song->voice[v].tremolo_sweep_position;
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depth >>= SWEEP_SHIFT;
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}
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}
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song->voice[v].tremolo_phase += song->voice[v].tremolo_phase_increment;
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/* if (song->voice[v].tremolo_phase >= (SINE_CYCLE_LENGTH<<RATE_SHIFT))
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song->voice[v].tremolo_phase -= SINE_CYCLE_LENGTH<<RATE_SHIFT; */
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song->voice[v].tremolo_volume = (float)
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(1.0 - FSCALENEG((sine(song->voice[v].tremolo_phase >> RATE_SHIFT) + 1.0)
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* depth * TREMOLO_AMPLITUDE_TUNING,
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17));
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/* I'm not sure about the +1.0 there -- it makes tremoloed voices'
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volumes on average the lower the higher the tremolo amplitude. */
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}
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/* Returns 1 if the note died */
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static int update_signal(MidiSong *song, int v)
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{
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if (song->voice[v].envelope_increment && update_envelope(song, v))
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return 1;
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if (song->voice[v].tremolo_phase_increment)
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update_tremolo(song, v);
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apply_envelope_to_amp(song, v);
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return 0;
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}
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#define MIXATION(a) *lp++ += (a)*s;
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static void mix_mystery_signal(MidiSong *song, sample_t *sp, Sint32 *lp, int v,
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int count)
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{
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Voice *vp = song->voice + v;
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final_volume_t
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left=vp->left_mix,
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right=vp->right_mix;
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int cc;
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sample_t s;
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if (!(cc = vp->control_counter))
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{
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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right = vp->right_mix;
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}
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while (count)
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if (cc < count)
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{
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count -= cc;
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while (cc--)
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{
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s = *sp++;
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MIXATION(left);
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MIXATION(right);
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}
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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right = vp->right_mix;
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}
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else
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{
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vp->control_counter = cc - count;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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MIXATION(right);
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}
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return;
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}
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}
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static void mix_center_signal(MidiSong *song, sample_t *sp, Sint32 *lp, int v,
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int count)
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{
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Voice *vp = song->voice + v;
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final_volume_t
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left=vp->left_mix;
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int cc;
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sample_t s;
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if (!(cc = vp->control_counter))
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{
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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}
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while (count)
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if (cc < count)
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{
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count -= cc;
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while (cc--)
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{
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s = *sp++;
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MIXATION(left);
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MIXATION(left);
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}
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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}
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else
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{
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vp->control_counter = cc - count;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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MIXATION(left);
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}
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return;
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}
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}
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static void mix_single_signal(MidiSong *song, sample_t *sp, Sint32 *lp, int v,
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int count)
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{
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Voice *vp = song->voice + v;
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final_volume_t
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left=vp->left_mix;
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int cc;
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sample_t s;
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if (!(cc = vp->control_counter))
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{
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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}
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while (count)
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if (cc < count)
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{
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count -= cc;
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while (cc--)
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{
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s = *sp++;
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MIXATION(left);
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lp++;
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}
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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}
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else
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{
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vp->control_counter = cc - count;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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lp++;
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}
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return;
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}
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}
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static void mix_mono_signal(MidiSong *song, sample_t *sp, Sint32 *lp, int v,
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int count)
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{
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Voice *vp = song->voice + v;
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final_volume_t
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left=vp->left_mix;
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int cc;
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sample_t s;
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if (!(cc = vp->control_counter))
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{
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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}
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while (count)
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if (cc < count)
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{
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count -= cc;
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while (cc--)
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{
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s = *sp++;
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MIXATION(left);
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}
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cc = song->control_ratio;
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if (update_signal(song, v))
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return; /* Envelope ran out */
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left = vp->left_mix;
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}
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else
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{
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vp->control_counter = cc - count;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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}
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return;
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}
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}
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static void mix_mystery(MidiSong *song, sample_t *sp, Sint32 *lp, int v, int count)
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{
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final_volume_t
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left = song->voice[v].left_mix,
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right = song->voice[v].right_mix;
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sample_t s;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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MIXATION(right);
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}
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}
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static void mix_center(MidiSong *song, sample_t *sp, Sint32 *lp, int v, int count)
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{
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final_volume_t
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left = song->voice[v].left_mix;
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sample_t s;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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MIXATION(left);
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}
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}
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static void mix_single(MidiSong *song, sample_t *sp, Sint32 *lp, int v, int count)
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{
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final_volume_t
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left = song->voice[v].left_mix;
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sample_t s;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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lp++;
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}
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}
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static void mix_mono(MidiSong *song, sample_t *sp, Sint32 *lp, int v, int count)
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{
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final_volume_t
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left = song->voice[v].left_mix;
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sample_t s;
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while (count--)
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{
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s = *sp++;
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MIXATION(left);
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}
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}
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/* Ramp a note out in c samples */
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static void ramp_out(MidiSong *song, sample_t *sp, Sint32 *lp, int v, Sint32 c)
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{
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/* should be final_volume_t, but Uint8 gives trouble. */
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Sint32 left, right, li, ri;
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sample_t s=0; /* silly warning about uninitialized s */
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left=song->voice[v].left_mix;
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li=-(left/c);
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if (!li) li=-1;
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/* printf("Ramping out: left=%d, c=%d, li=%d\n", left, c, li); */
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if (!(song->encoding & PE_MONO))
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{
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if (song->voice[v].panned==PANNED_MYSTERY)
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{
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right=song->voice[v].right_mix;
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ri=-(right/c);
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while (c--)
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{
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left += li;
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if (left<0)
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left=0;
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right += ri;
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if (right<0)
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right=0;
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s=*sp++;
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MIXATION(left);
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MIXATION(right);
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}
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}
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else if (song->voice[v].panned==PANNED_CENTER)
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{
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while (c--)
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{
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left += li;
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if (left<0)
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return;
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s=*sp++;
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MIXATION(left);
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MIXATION(left);
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}
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}
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else if (song->voice[v].panned==PANNED_LEFT)
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{
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while (c--)
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{
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left += li;
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if (left<0)
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return;
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s=*sp++;
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MIXATION(left);
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lp++;
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}
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}
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else if (song->voice[v].panned==PANNED_RIGHT)
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{
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while (c--)
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{
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left += li;
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if (left<0)
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return;
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s=*sp++;
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lp++;
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MIXATION(left);
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}
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}
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}
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else
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{
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/* Mono output. */
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while (c--)
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{
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left += li;
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if (left<0)
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return;
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s=*sp++;
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MIXATION(left);
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}
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}
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}
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/**************** interface function ******************/
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void mix_voice(MidiSong *song, Sint32 *buf, int v, Sint32 c)
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{
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Voice *vp = song->voice + v;
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sample_t *sp;
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if (vp->status==VOICE_DIE)
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{
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if (c>=MAX_DIE_TIME)
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c=MAX_DIE_TIME;
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sp=resample_voice(song, v, &c);
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if(c > 0)
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ramp_out(song, sp, buf, v, c);
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vp->status=VOICE_FREE;
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}
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else
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{
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sp=resample_voice(song, v, &c);
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if (song->encoding & PE_MONO)
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{
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/* Mono output. */
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if (vp->envelope_increment || vp->tremolo_phase_increment)
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mix_mono_signal(song, sp, buf, v, c);
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else
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mix_mono(song, sp, buf, v, c);
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}
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else
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{
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if (vp->panned == PANNED_MYSTERY)
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{
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if (vp->envelope_increment || vp->tremolo_phase_increment)
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mix_mystery_signal(song, sp, buf, v, c);
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else
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mix_mystery(song, sp, buf, v, c);
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}
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else if (vp->panned == PANNED_CENTER)
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{
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if (vp->envelope_increment || vp->tremolo_phase_increment)
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mix_center_signal(song, sp, buf, v, c);
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else
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mix_center(song, sp, buf, v, c);
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}
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else
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{
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/* It's either full left or full right. In either case,
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every other sample is 0. Just get the offset right: */
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if (vp->panned == PANNED_RIGHT) buf++;
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if (vp->envelope_increment || vp->tremolo_phase_increment)
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mix_single_signal(song, sp, buf, v, c);
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else
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mix_single(song, sp, buf, v, c);
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}
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}
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}
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}
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