mirror of https://github.com/ZDoom/gzdoom.git
619 lines
13 KiB
C++
619 lines
13 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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resample.c
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*/
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#include <math.h>
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#include <stdio.h>
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#include <malloc.h>
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#include "timidity.h"
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#include "c_cvars.h"
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EXTERN_CVAR(Bool, midi_timiditylike)
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namespace Timidity
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{
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#define RESAMPLATION {\
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int o = ofs >> FRACTION_BITS, m = ofs & FRACTION_MASK; \
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*dest++ = src[o] + (src[o + 1] - src[o]) * m / (1 << FRACTION_BITS);\
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}
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#define FINALINTERP if (ofs == le) *dest++ = src[ofs >> FRACTION_BITS];
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/* So it isn't interpolation. At least it's final. */
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/*************** resampling with fixed increment *****************/
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static sample_t *rs_plain(sample_t *resample_buffer, Voice *v, int *countptr)
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{
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/* Play sample until end, then free the voice. */
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const sample_t
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*src = v->sample->data;
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sample_t
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*dest = resample_buffer;
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int
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ofs = v->sample_offset,
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incr = v->sample_increment,
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le = v->sample->data_length,
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count = *countptr;
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int i;
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if (incr < 0) incr = -incr; /* In case we're coming out of a bidir loop */
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/* Precalc how many times we should go through the loop.
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NOTE: Assumes that incr > 0 and that ofs <= le */
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i = (le - ofs) / incr + 1;
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if (i > count)
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{
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i = count;
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count = 0;
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}
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else
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{
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count -= i;
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}
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while (i--)
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{
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RESAMPLATION;
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ofs += incr;
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}
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if (ofs >= le)
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{
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FINALINTERP;
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v->status = 0;
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*countptr -= count + 1;
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}
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v->sample_offset = ofs; /* Update offset */
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return resample_buffer;
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}
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static sample_t *rs_loop(sample_t *resample_buffer, Voice *vp, int count)
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{
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/* Play sample until end-of-loop, skip back and continue. */
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int
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ofs = vp->sample_offset,
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incr = vp->sample_increment,
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le = vp->sample->loop_end,
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ll = le - vp->sample->loop_start;
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sample_t
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*dest = resample_buffer;
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const sample_t
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*src = vp->sample->data;
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int i;
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while (count)
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{
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if (ofs >= le)
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/* NOTE: Assumes that ll > incr and that incr > 0. */
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ofs -= ll;
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/* Precalc how many times we should go through the loop */
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i = (le - ofs) / incr + 1;
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if (i > count)
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{
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i = count;
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count = 0;
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}
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else
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{
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count -= i;
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}
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while (i--)
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{
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RESAMPLATION;
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ofs += incr;
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}
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}
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vp->sample_offset=ofs; /* Update offset */
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return resample_buffer;
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}
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static sample_t *rs_bidir(sample_t *resample_buffer, Voice *vp, int count)
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{
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int
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ofs = vp->sample_offset,
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incr = vp->sample_increment,
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le = vp->sample->loop_end,
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ls = vp->sample->loop_start;
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sample_t
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*dest = resample_buffer;
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const sample_t
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*src = vp->sample->data;
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int
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le2 = le << 1,
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ls2 = ls << 1,
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i;
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/* Play normally until inside the loop region */
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if (ofs <= ls)
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{
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/* NOTE: Assumes that incr > 0, which is NOT always the case
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when doing bidirectional looping. I have yet to see a case
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where both ofs <= ls AND incr < 0, however. */
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i = (ls - ofs) / incr + 1;
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if (i > count)
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{
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i = count;
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count = 0;
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}
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else
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{
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count -= i;
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}
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while (i--)
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{
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RESAMPLATION;
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ofs += incr;
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}
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}
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/* Then do the bidirectional looping */
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while(count)
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{
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/* Precalc how many times we should go through the loop */
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i = ((incr > 0 ? le : ls) - ofs) / incr + 1;
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if (i > count)
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{
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i = count;
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count = 0;
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}
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else
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{
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count -= i;
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}
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while (i--)
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{
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RESAMPLATION;
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ofs += incr;
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}
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if (ofs >= le)
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{
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/* fold the overshoot back in */
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ofs = le2 - ofs;
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incr *= -1;
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}
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else if (ofs <= ls)
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{
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ofs = ls2 - ofs;
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incr *= -1;
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}
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}
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vp->sample_increment = incr;
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vp->sample_offset = ofs; /* Update offset */
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return resample_buffer;
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}
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/*********************** vibrato versions ***************************/
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/* We only need to compute one half of the vibrato sine cycle */
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static int vib_phase_to_inc_ptr(int phase)
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{
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if (phase < VIBRATO_SAMPLE_INCREMENTS / 2)
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return VIBRATO_SAMPLE_INCREMENTS / 2 - 1 - phase;
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else if (phase >= VIBRATO_SAMPLE_INCREMENTS * 3 / 2)
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return VIBRATO_SAMPLE_INCREMENTS * 5 / 2 - 1 - phase;
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else
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return phase - VIBRATO_SAMPLE_INCREMENTS / 2;
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}
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static int update_vibrato(float output_rate, Voice *vp, int sign)
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{
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int depth;
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int phase;
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double a, pb;
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if (vp->vibrato_phase++ >= 2 * VIBRATO_SAMPLE_INCREMENTS - 1)
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vp->vibrato_phase = 0;
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phase = vib_phase_to_inc_ptr(vp->vibrato_phase);
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if (vp->vibrato_sample_increment[phase])
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{
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if (sign)
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return -vp->vibrato_sample_increment[phase];
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else
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return vp->vibrato_sample_increment[phase];
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}
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/* Need to compute this sample increment. */
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depth = vp->sample->vibrato_depth << 7;
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if (vp->vibrato_sweep != 0)
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{
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/* Need to update sweep */
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vp->vibrato_sweep_position += vp->vibrato_sweep;
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if (vp->vibrato_sweep_position >= (1<<SWEEP_SHIFT))
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vp->vibrato_sweep=0;
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else
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{
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/* Adjust depth */
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depth *= vp->vibrato_sweep_position;
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depth >>= SWEEP_SHIFT;
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}
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}
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a = FSCALE(((double)(vp->sample->sample_rate) * vp->frequency) /
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((double)(vp->sample->root_freq) * output_rate),
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FRACTION_BITS);
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pb = (sine(vp->vibrato_phase * (1.0/(2*VIBRATO_SAMPLE_INCREMENTS)))
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* (double)(depth) * VIBRATO_AMPLITUDE_TUNING);
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a *= pow(2.0, pb / (8192 * 12.f));
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/* If the sweep's over, we can store the newly computed sample_increment */
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if (!vp->vibrato_sweep)
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vp->vibrato_sample_increment[phase] = (int) a;
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if (sign)
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a = -a; /* need to preserve the loop direction */
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return (int) a;
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}
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static sample_t *rs_vib_plain(sample_t *resample_buffer, float rate, Voice *vp, int *countptr)
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{
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/* Play sample until end, then free the voice. */
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sample_t
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*dest = resample_buffer;
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const sample_t
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*src = vp->sample->data;
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int
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le = vp->sample->data_length,
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ofs = vp->sample_offset,
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incr = vp->sample_increment,
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count = *countptr;
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int
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cc = vp->vibrato_control_counter;
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/* This has never been tested */
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if (incr < 0) incr = -incr; /* In case we're coming out of a bidir loop */
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while (count--)
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{
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if (!cc--)
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{
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cc = vp->vibrato_control_ratio;
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incr = update_vibrato(rate, vp, 0);
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}
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RESAMPLATION;
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ofs += incr;
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if (ofs >= le)
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{
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FINALINTERP;
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vp->status = 0;
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*countptr -= count+1;
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break;
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}
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}
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vp->vibrato_control_counter = cc;
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vp->sample_increment = incr;
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vp->sample_offset = ofs; /* Update offset */
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return resample_buffer;
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}
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static sample_t *rs_vib_loop(sample_t *resample_buffer, float rate, Voice *vp, int count)
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{
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/* Play sample until end-of-loop, skip back and continue. */
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int
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ofs = vp->sample_offset,
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incr = vp->sample_increment,
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le = vp->sample->loop_end,
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ll = le - vp->sample->loop_start;
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sample_t
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*dest = resample_buffer;
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const sample_t
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*src = vp->sample->data;
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int
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cc = vp->vibrato_control_counter;
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int i;
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int
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vibflag=0;
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while (count)
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{
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/* Hopefully the loop is longer than an increment */
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if (ofs >= le)
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ofs -= ll;
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/* Precalc how many times to go through the loop, taking
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the vibrato control ratio into account this time. */
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i = (le - ofs) / incr + 1;
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if (i > count) i = count;
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if (i > cc)
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{
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i = cc;
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vibflag = 1;
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}
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else
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{
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cc -= i;
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}
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count -= i;
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while (i--)
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{
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RESAMPLATION;
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ofs += incr;
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}
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if (vibflag)
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{
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cc = vp->vibrato_control_ratio;
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incr = update_vibrato(rate, vp, 0);
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vibflag = 0;
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}
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}
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vp->vibrato_control_counter = cc;
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vp->sample_increment = incr;
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vp->sample_offset = ofs; /* Update offset */
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return resample_buffer;
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}
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static sample_t *rs_vib_bidir(sample_t *resample_buffer, float rate, Voice *vp, int count)
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{
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int
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ofs = vp->sample_offset,
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incr = vp->sample_increment,
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le = vp->sample->loop_end,
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ls = vp->sample->loop_start;
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sample_t
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*dest = resample_buffer;
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const sample_t
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*src = vp->sample->data;
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int
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cc = vp->vibrato_control_counter;
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int
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le2 = le << 1,
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ls2 = ls << 1,
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i;
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int
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vibflag = 0;
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/* Play normally until inside the loop region */
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while (count && (ofs <= ls))
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{
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i = (ls - ofs) / incr + 1;
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if (i > count)
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{
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i = count;
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}
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if (i > cc)
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{
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i = cc;
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vibflag = 1;
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}
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else
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{
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cc -= i;
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}
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count -= i;
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while (i--)
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{
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RESAMPLATION;
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ofs += incr;
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}
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if (vibflag)
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{
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cc = vp->vibrato_control_ratio;
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incr = update_vibrato(rate, vp, 0);
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vibflag = 0;
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}
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}
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/* Then do the bidirectional looping */
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while (count)
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{
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/* Precalc how many times we should go through the loop */
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i = ((incr > 0 ? le : ls) - ofs) / incr + 1;
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if(i > count)
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{
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i = count;
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}
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if(i > cc)
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{
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i = cc;
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vibflag = 1;
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}
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else
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{
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cc -= i;
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}
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count -= i;
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while (i--)
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{
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RESAMPLATION;
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ofs += incr;
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}
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if (vibflag)
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{
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cc = vp->vibrato_control_ratio;
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incr = update_vibrato(rate, vp, (incr < 0));
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vibflag = 0;
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}
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if (ofs >= le)
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{
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/* fold the overshoot back in */
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ofs = le2 - ofs;
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incr *= -1;
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}
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else if (ofs <= ls)
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{
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ofs = ls2 - ofs;
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incr *= -1;
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}
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}
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vp->vibrato_control_counter = cc;
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vp->sample_increment = incr;
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vp->sample_offset = ofs; /* Update offset */
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return resample_buffer;
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}
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sample_t *resample_voice(Renderer *song, Voice *vp, int *countptr)
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{
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int ofs;
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WORD modes;
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if (vp->sample->sample_rate == 0)
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{
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/* Pre-resampled data -- just update the offset and check if
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we're out of data. */
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ofs = vp->sample_offset >> FRACTION_BITS; /* Kind of silly to use FRACTION_BITS here... */
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if (*countptr >= (vp->sample->data_length >> FRACTION_BITS) - ofs)
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{
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/* Note finished. Free the voice. */
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vp->status = 0;
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/* Let the caller know how much data we had left */
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*countptr = (vp->sample->data_length >> FRACTION_BITS) - ofs;
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}
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else
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{
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vp->sample_offset += *countptr << FRACTION_BITS;
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}
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return vp->sample->data + ofs;
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}
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/* Need to resample. Use the proper function. */
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modes = vp->sample->modes;
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if (vp->status & VOICE_LPE)
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{
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if (vp->sample->loop_end - vp->sample->loop_start < 2)
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{ // Loop is too short; turn it off.
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vp->status &= ~VOICE_LPE;
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}
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}
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if (vp->vibrato_control_ratio)
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{
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if (vp->status & VOICE_LPE && !(midi_timiditylike && vp->sample->modes & PATCH_T_NO_LOOP))
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{
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if (modes & PATCH_BIDIR)
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return rs_vib_bidir(song->resample_buffer, song->rate, vp, *countptr);
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else
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return rs_vib_loop(song->resample_buffer, song->rate, vp, *countptr);
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}
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else
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{
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return rs_vib_plain(song->resample_buffer, song->rate, vp, countptr);
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}
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}
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else
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{
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if (vp->status & VOICE_LPE && !(midi_timiditylike && vp->sample->modes & PATCH_T_NO_LOOP))
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{
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if (modes & PATCH_BIDIR)
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return rs_bidir(song->resample_buffer, vp, *countptr);
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else
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return rs_loop(song->resample_buffer, vp, *countptr);
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}
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else
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{
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return rs_plain(song->resample_buffer, vp, countptr);
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}
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}
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}
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void pre_resample(Renderer *song, Sample *sp)
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{
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double a, xdiff;
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int incr, ofs, newlen, count;
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sample_t *newdata, *dest, *src = sp->data;
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sample_t v1, v2, v3, v4, *vptr;
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static const char note_name[12][3] =
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{
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"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"
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};
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if (sp->scale_factor != 0)
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return;
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cmsg(CMSG_INFO, VERB_NOISY, " * pre-resampling for note %d (%s%d)\n",
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sp->scale_note,
|
|
note_name[sp->scale_note % 12], (sp->scale_note & 0x7F) / 12);
|
|
|
|
a = (sp->sample_rate * note_to_freq(sp->scale_note)) / (sp->root_freq * song->rate);
|
|
if (a <= 0)
|
|
return;
|
|
newlen = (int)(sp->data_length / a);
|
|
if (newlen < 0 || (newlen >> FRACTION_BITS) > MAX_SAMPLE_SIZE)
|
|
return;
|
|
|
|
count = newlen >> FRACTION_BITS;
|
|
dest = newdata = (sample_t *)safe_malloc(count * sizeof(float));
|
|
|
|
ofs = incr = (sp->data_length - (1 << FRACTION_BITS)) / count;
|
|
|
|
if (--count)
|
|
*dest++ = src[0];
|
|
|
|
/* Since we're pre-processing and this doesn't have to be done in
|
|
real-time, we go ahead and do the full sliding cubic interpolation. */
|
|
while (--count)
|
|
{
|
|
vptr = src + (ofs >> FRACTION_BITS);
|
|
v1 = (vptr == src) ? *vptr : *(vptr - 1);
|
|
v2 = *vptr;
|
|
v3 = *(vptr + 1);
|
|
v4 = *(vptr + 2);
|
|
xdiff = FSCALENEG(ofs & FRACTION_MASK, FRACTION_BITS);
|
|
*dest++ = sample_t(v2 + (xdiff / 6.0) * (-2 * v1 - 3 * v2 + 6 * v3 - v4 +
|
|
xdiff * (3 * (v1 - 2 * v2 + v3) + xdiff * (-v1 + 3 * (v2 - v3) + v4))));
|
|
ofs += incr;
|
|
}
|
|
|
|
if (ofs & FRACTION_MASK)
|
|
{
|
|
RESAMPLATION
|
|
}
|
|
else
|
|
{
|
|
*dest++ = src[ofs >> FRACTION_BITS];
|
|
}
|
|
|
|
sp->data_length = newlen;
|
|
sp->loop_start = int(sp->loop_start / a);
|
|
sp->loop_end = int(sp->loop_end / a);
|
|
free(sp->data);
|
|
sp->data = newdata;
|
|
sp->sample_rate = 0;
|
|
}
|
|
|
|
}
|