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https://github.com/ZDoom/qzdoom.git
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0d18580ff0
particular, this meant that every channel was almost certainly in mono mode, which can sound pretty bad if the song isn't meant to be played that way. - Added bank numbers to the MIDI precaching for Timidity, since I guess I do need to care about banks, if even the Duke MIDIs use various banks. - Fixed: snd_midiprecache only exists in Win32 builds, so gameconfigfile.cpp shouldn't unconditionally link against it. - Fixed: pre_resample() was still disabled, and it left two samples at the end of the new wave data uninitialized. SVN r903 (trunk)
582 lines
11 KiB
C++
582 lines
11 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 library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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mix.c
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*/
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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 "timidity.h"
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namespace Timidity
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{
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/* Returns 1 if envelope runs out */
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int recompute_envelope(Voice *v)
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{
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int stage;
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stage = v->envelope_stage;
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if (stage >= DELAY)
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{
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/* Envelope ran out. */
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int tmp = (v->status == VOICE_DIE); /* Already displayed as dead */
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v->status = VOICE_FREE;
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return 1;
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}
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if (v->sample->modes & MODES_ENVELOPE)
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{
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if (v->status == VOICE_ON || v->status == VOICE_SUSTAINED)
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{
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if (stage > DECAY)
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{
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/* Freeze envelope until note turns off. Trumpets want this. */
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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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v->envelope_stage = stage + 1;
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if (v->envelope_volume == v->sample->envelope_offset[stage])
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return recompute_envelope(v);
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v->envelope_target = v->sample->envelope_offset[stage];
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v->envelope_increment = v->sample->envelope_rate[stage];
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if (v->envelope_target < v->envelope_volume)
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v->envelope_increment = -v->envelope_increment;
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return 0;
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}
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void apply_envelope_to_amp(Voice *v)
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{
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double lamp = v->left_amp, ramp;
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if (v->panned == PANNED_MYSTERY)
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{
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ramp = v->right_amp;
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if (v->tremolo_phase_increment)
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{
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lamp *= v->tremolo_volume;
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ramp *= v->tremolo_volume;
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}
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if (v->sample->modes & MODES_ENVELOPE)
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{
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double vol = calc_vol(v->envelope_volume / float(1 << 30));
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lamp *= vol;
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ramp *= vol;
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}
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v->left_mix = float(lamp);
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v->right_mix = float(ramp);
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}
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else
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{
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if (v->tremolo_phase_increment)
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lamp *= v->tremolo_volume;
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if (v->sample->modes & MODES_ENVELOPE)
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lamp *= calc_vol(v->envelope_volume / float(1 << 30));
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v->left_mix = float(lamp);
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}
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}
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static int update_envelope(Voice *v)
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{
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v->envelope_volume += v->envelope_increment;
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/* Why is there no ^^ operator?? */
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if (((v->envelope_increment < 0) && (v->envelope_volume <= v->envelope_target)) ||
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((v->envelope_increment > 0) && (v->envelope_volume >= v->envelope_target)))
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{
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v->envelope_volume = v->envelope_target;
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if (recompute_envelope(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(Voice *v)
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{
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int depth = v->sample->tremolo_depth << 7;
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if (v->tremolo_sweep)
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{
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/* Update sweep position */
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v->tremolo_sweep_position += v->tremolo_sweep;
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if (v->tremolo_sweep_position >= (1 << SWEEP_SHIFT))
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{
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/* Swept to max amplitude */
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v->tremolo_sweep = 0;
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}
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else
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{
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/* Need to adjust depth */
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depth *= v->tremolo_sweep_position;
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depth >>= SWEEP_SHIFT;
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}
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}
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v->tremolo_phase += v->tremolo_phase_increment;
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v->tremolo_volume = (float)
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(1.0 - FSCALENEG((sine(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(Voice *v)
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{
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if (v->envelope_increment && update_envelope(v))
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return 1;
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if (v->tremolo_phase_increment)
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update_tremolo(v);
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apply_envelope_to_amp(v);
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return 0;
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}
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static void mix_mystery_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix,
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right = v->right_mix;
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int cc;
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sample_t s;
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if (!(cc = v->control_counter))
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{
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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right = v->right_mix;
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}
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while (count)
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{
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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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lp[0] += left * s;
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lp[1] += right * s;
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lp += 2;
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}
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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right = v->right_mix;
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}
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else
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{
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v->control_counter = cc - count;
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while (count--)
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{
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s = *sp++;
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lp[0] += left * s;
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lp[1] += right * s;
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lp += 2;
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}
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return;
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}
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}
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}
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static void mix_center_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix;
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int cc;
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sample_t s;
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if (!(cc = v->control_counter))
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{
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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while (count)
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{
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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++ * left;
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lp[0] += s;
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lp[1] += s;
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lp += 2;
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}
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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else
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{
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v->control_counter = cc - count;
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while (count--)
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{
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s = *sp++ * left;
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lp[0] += s;
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lp[1] += s;
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lp += 2;
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}
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return;
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}
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}
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}
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static void mix_single_left_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix;
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int cc;
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if (!(cc = v->control_counter))
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{
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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while (count)
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{
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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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lp[0] += *sp++ * left;
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lp += 2;
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}
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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else
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{
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v->control_counter = cc - count;
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while (count--)
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{
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lp[0] += *sp++ * left;
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lp += 2;
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}
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return;
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}
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}
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}
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static void mix_single_right_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix;
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int cc;
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if (!(cc = v->control_counter))
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{
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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while (count)
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{
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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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lp[1] += *sp++ * left;
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lp += 2;
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}
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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else
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{
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v->control_counter = cc - count;
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while (count--)
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{
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lp[1] += *sp++ * left;
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lp += 2;
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}
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return;
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}
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}
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}
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static void mix_mono_signal(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix;
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int cc;
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if (!(cc = v->control_counter))
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{
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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while (count)
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{
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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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*lp++ += *sp++ * left;
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}
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cc = control_ratio;
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if (update_signal(v))
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return; /* Envelope ran out */
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left = v->left_mix;
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}
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else
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{
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v->control_counter = cc - count;
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while (count--)
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{
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*lp++ += *sp++ * left;
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}
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return;
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}
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}
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}
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static void mix_mystery(SDWORD control_ratio, const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix,
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right = 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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lp[0] += s * left;
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lp[1] += s * right;
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lp += 2;
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}
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}
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static void mix_center(const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = 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++ * left;
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lp[0] += s;
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lp[1] += s;
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lp += 2;
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}
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}
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static void mix_single_left(const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix;
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while (count--)
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{
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lp[0] += *sp++ * left;
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lp += 2;
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}
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}
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static void mix_single_right(const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix;
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while (count--)
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{
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lp[1] += *sp++ * left;
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lp += 2;
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}
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}
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static void mix_mono(const sample_t *sp, float *lp, Voice *v, int count)
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{
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final_volume_t
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left = v->left_mix;
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while (count--)
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{
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*lp++ += *sp++ * 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(const sample_t *sp, float *lp, Voice *v, int c)
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{
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final_volume_t left, right, li, ri;
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sample_t s = 0; /* silly warning about uninitialized s */
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/* Fix by James Caldwell */
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if ( c == 0 ) c = 1;
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left = v->left_mix;
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li = -(left/c);
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if (li == 0) li = -1;
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/* printf("Ramping out: left=%d, c=%d, li=%d\n", left, c, li); */
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if (v->panned == PANNED_MYSTERY)
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{
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right = 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; if (left < 0) left = 0;
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right += ri; if (right < 0) right = 0;
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s = *sp++;
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lp[0] += s * left;
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lp[1] += s * right;
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lp += 2;
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}
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}
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else if (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++ * left;
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lp[0] += s;
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lp[1] += s;
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lp += 2;
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}
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}
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else if (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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lp[0] += *sp++ * left;
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lp += 2;
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}
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}
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else if (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[1] += *sp++ * left;
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lp += 2;
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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(Renderer *song, float *buf, Voice *v, int c)
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{
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int count = c;
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sample_t *sp;
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if (c < 0)
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{
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return;
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}
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if (v->status == VOICE_DIE)
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{
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if (count >= MAX_DIE_TIME)
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count = MAX_DIE_TIME;
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sp = resample_voice(song, v, &count);
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ramp_out(sp, buf, v, count);
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v->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, &count);
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if (count < 0)
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{
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return;
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}
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if (v->panned == PANNED_MYSTERY)
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{
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if (v->envelope_increment || v->tremolo_phase_increment)
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mix_mystery_signal(song->control_ratio, sp, buf, v, count);
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else
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mix_mystery(song->control_ratio, sp, buf, v, count);
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}
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else if (v->panned == PANNED_CENTER)
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{
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if (v->envelope_increment || v->tremolo_phase_increment)
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mix_center_signal(song->control_ratio, sp, buf, v, count);
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else
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mix_center(sp, buf, v, count);
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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 (v->envelope_increment || v->tremolo_phase_increment)
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{
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if (v->panned == PANNED_RIGHT)
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mix_single_right_signal(song->control_ratio, sp, buf, v, count);
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else
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mix_single_left_signal(song->control_ratio, sp, buf, v, count);
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}
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else
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{
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if (v->panned == PANNED_RIGHT)
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mix_single_right(sp, buf, v, count);
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else
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mix_single_left(sp, buf, v, count);
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}
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}
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}
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}
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}
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