637 lines
26 KiB
C
637 lines
26 KiB
C
/* FluidSynth - A Software Synthesizer
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*
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* Copyright (C) 2003 Peter Hanappe and others.
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*
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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 License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* 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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*
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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
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include "fluid_sys.h"
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#include "fluid_phase.h"
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#include "fluid_rvoice.h"
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#include "fluid_rvoice_dsp_tables.inc.h"
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/* Purpose:
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*
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* Interpolates audio data (obtains values between the samples of the original
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* waveform data).
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*
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* Variables loaded from the voice structure (assigned in fluid_rvoice_write()):
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* - dsp_data: Pointer to the original waveform data
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* - dsp_phase: The position in the original waveform data.
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* This has an integer and a fractional part (between samples).
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* - dsp_phase_incr: For each output sample, the position in the original
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* waveform advances by dsp_phase_incr. This also has an integer
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* part and a fractional part.
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* If a sample is played at root pitch (no pitch change),
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* dsp_phase_incr is integer=1 and fractional=0.
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* - dsp_amp: The current amplitude envelope value.
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* - dsp_amp_incr: The changing rate of the amplitude envelope.
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*
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* A couple of variables are used internally, their results are discarded:
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* - dsp_i: Index through the output buffer
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* - dsp_buf: Output buffer of floating point values (FLUID_BUFSIZE in length)
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*/
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/* Interpolation (find a value between two samples of the original waveform) */
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static FLUID_INLINE fluid_real_t
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fluid_rvoice_get_float_sample(const short int *dsp_msb, const char *dsp_lsb, unsigned int idx)
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{
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int32_t sample = fluid_rvoice_get_sample(dsp_msb, dsp_lsb, idx);
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return (fluid_real_t)sample;
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}
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/* No interpolation. Just take the sample, which is closest to
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* the playback pointer. Questionable quality, but very
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* efficient. */
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int
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fluid_rvoice_dsp_interpolate_none(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int looping)
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{
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fluid_phase_t dsp_phase = voice->phase;
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fluid_phase_t dsp_phase_incr;
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short int *dsp_data = voice->sample->data;
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char *dsp_data24 = voice->sample->data24;
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fluid_real_t dsp_amp = voice->amp;
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fluid_real_t dsp_amp_incr = voice->amp_incr;
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unsigned int dsp_i = 0;
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unsigned int dsp_phase_index;
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unsigned int end_index;
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/* Convert playback "speed" floating point value to phase index/fract */
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fluid_phase_set_float(dsp_phase_incr, voice->phase_incr);
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end_index = looping ? voice->loopend - 1 : voice->end;
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while(1)
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{
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dsp_phase_index = fluid_phase_index_round(dsp_phase); /* round to nearest point */
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/* interpolate sequence of sample points */
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for(; dsp_i < FLUID_BUFSIZE && dsp_phase_index <= end_index; dsp_i++)
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{
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dsp_buf[dsp_i] = dsp_amp * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index);
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/* increment phase and amplitude */
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fluid_phase_incr(dsp_phase, dsp_phase_incr);
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dsp_phase_index = fluid_phase_index_round(dsp_phase); /* round to nearest point */
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dsp_amp += dsp_amp_incr;
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}
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/* break out if not looping (buffer may not be full) */
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if(!looping)
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{
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break;
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}
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/* go back to loop start */
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if(dsp_phase_index > end_index)
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{
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fluid_phase_sub_int(dsp_phase, voice->loopend - voice->loopstart);
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voice->has_looped = 1;
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}
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/* break out if filled buffer */
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if(dsp_i >= FLUID_BUFSIZE)
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{
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break;
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}
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}
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voice->phase = dsp_phase;
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voice->amp = dsp_amp;
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return (dsp_i);
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}
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/* Straight line interpolation.
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* Returns number of samples processed (usually FLUID_BUFSIZE but could be
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* smaller if end of sample occurs).
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*/
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int
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fluid_rvoice_dsp_interpolate_linear(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int looping)
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{
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fluid_phase_t dsp_phase = voice->phase;
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fluid_phase_t dsp_phase_incr;
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short int *dsp_data = voice->sample->data;
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char *dsp_data24 = voice->sample->data24;
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fluid_real_t dsp_amp = voice->amp;
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fluid_real_t dsp_amp_incr = voice->amp_incr;
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unsigned int dsp_i = 0;
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unsigned int dsp_phase_index;
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unsigned int end_index;
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fluid_real_t point;
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const fluid_real_t *FLUID_RESTRICT coeffs;
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/* Convert playback "speed" floating point value to phase index/fract */
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fluid_phase_set_float(dsp_phase_incr, voice->phase_incr);
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/* last index before 2nd interpolation point must be specially handled */
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end_index = (looping ? voice->loopend - 1 : voice->end) - 1;
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/* 2nd interpolation point to use at end of loop or sample */
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if(looping)
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{
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point = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopstart); /* loop start */
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}
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else
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{
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point = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->end); /* duplicate end for samples no longer looping */
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}
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while(1)
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{
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dsp_phase_index = fluid_phase_index(dsp_phase);
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/* interpolate the sequence of sample points */
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for(; dsp_i < FLUID_BUFSIZE && dsp_phase_index <= end_index; dsp_i++)
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{
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coeffs = interp_coeff_linear[fluid_phase_fract_to_tablerow(dsp_phase)];
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dsp_buf[dsp_i] = dsp_amp * (coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
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+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1));
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/* increment phase and amplitude */
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fluid_phase_incr(dsp_phase, dsp_phase_incr);
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dsp_phase_index = fluid_phase_index(dsp_phase);
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dsp_amp += dsp_amp_incr;
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}
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/* break out if buffer filled */
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if(dsp_i >= FLUID_BUFSIZE)
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{
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break;
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}
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end_index++; /* we're now interpolating the last point */
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/* interpolate within last point */
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for(; dsp_phase_index <= end_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
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{
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coeffs = interp_coeff_linear[fluid_phase_fract_to_tablerow(dsp_phase)];
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dsp_buf[dsp_i] = dsp_amp * (coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
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+ coeffs[1] * point);
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/* increment phase and amplitude */
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fluid_phase_incr(dsp_phase, dsp_phase_incr);
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dsp_phase_index = fluid_phase_index(dsp_phase);
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dsp_amp += dsp_amp_incr; /* increment amplitude */
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}
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if(!looping)
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{
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break; /* break out if not looping (end of sample) */
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}
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/* go back to loop start (if past */
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if(dsp_phase_index > end_index)
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{
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fluid_phase_sub_int(dsp_phase, voice->loopend - voice->loopstart);
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voice->has_looped = 1;
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}
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/* break out if filled buffer */
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if(dsp_i >= FLUID_BUFSIZE)
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{
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break;
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}
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end_index--; /* set end back to second to last sample point */
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}
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voice->phase = dsp_phase;
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voice->amp = dsp_amp;
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return (dsp_i);
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}
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/* 4th order (cubic) interpolation.
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* Returns number of samples processed (usually FLUID_BUFSIZE but could be
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* smaller if end of sample occurs).
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*/
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int
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fluid_rvoice_dsp_interpolate_4th_order(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int looping)
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{
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fluid_phase_t dsp_phase = voice->phase;
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fluid_phase_t dsp_phase_incr;
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short int *dsp_data = voice->sample->data;
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char *dsp_data24 = voice->sample->data24;
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fluid_real_t dsp_amp = voice->amp;
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fluid_real_t dsp_amp_incr = voice->amp_incr;
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unsigned int dsp_i = 0;
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unsigned int dsp_phase_index;
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unsigned int start_index, end_index;
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fluid_real_t start_point, end_point1, end_point2;
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const fluid_real_t *FLUID_RESTRICT coeffs;
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/* Convert playback "speed" floating point value to phase index/fract */
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fluid_phase_set_float(dsp_phase_incr, voice->phase_incr);
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/* last index before 4th interpolation point must be specially handled */
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end_index = (looping ? voice->loopend - 1 : voice->end) - 2;
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if(voice->has_looped) /* set start_index and start point if looped or not */
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{
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start_index = voice->loopstart;
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start_point = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 1); /* last point in loop (wrap around) */
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}
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else
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{
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start_index = voice->start;
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start_point = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->start); /* just duplicate the point */
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}
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/* get points off the end (loop start if looping, duplicate point if end) */
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if(looping)
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{
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end_point1 = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopstart);
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end_point2 = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopstart + 1);
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}
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else
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{
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end_point1 = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->end);
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end_point2 = end_point1;
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}
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while(1)
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{
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dsp_phase_index = fluid_phase_index(dsp_phase);
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/* interpolate first sample point (start or loop start) if needed */
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for(; dsp_phase_index == start_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
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{
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coeffs = interp_coeff[fluid_phase_fract_to_tablerow(dsp_phase)];
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dsp_buf[dsp_i] = dsp_amp *
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(coeffs[0] * start_point
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+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
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+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
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+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 2));
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/* increment phase and amplitude */
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fluid_phase_incr(dsp_phase, dsp_phase_incr);
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dsp_phase_index = fluid_phase_index(dsp_phase);
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dsp_amp += dsp_amp_incr;
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}
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/* interpolate the sequence of sample points */
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for(; dsp_i < FLUID_BUFSIZE && dsp_phase_index <= end_index; dsp_i++)
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{
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coeffs = interp_coeff[fluid_phase_fract_to_tablerow(dsp_phase)];
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dsp_buf[dsp_i] = dsp_amp *
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(coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
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+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
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+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
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+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 2));
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/* increment phase and amplitude */
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fluid_phase_incr(dsp_phase, dsp_phase_incr);
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dsp_phase_index = fluid_phase_index(dsp_phase);
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dsp_amp += dsp_amp_incr;
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}
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/* break out if buffer filled */
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if(dsp_i >= FLUID_BUFSIZE)
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{
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break;
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}
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end_index++; /* we're now interpolating the 2nd to last point */
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/* interpolate within 2nd to last point */
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for(; dsp_phase_index <= end_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
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{
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coeffs = interp_coeff[fluid_phase_fract_to_tablerow(dsp_phase)];
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dsp_buf[dsp_i] = dsp_amp *
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(coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
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+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
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+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
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+ coeffs[3] * end_point1);
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/* increment phase and amplitude */
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fluid_phase_incr(dsp_phase, dsp_phase_incr);
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dsp_phase_index = fluid_phase_index(dsp_phase);
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dsp_amp += dsp_amp_incr;
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}
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end_index++; /* we're now interpolating the last point */
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/* interpolate within the last point */
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for(; dsp_phase_index <= end_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
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{
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coeffs = interp_coeff[fluid_phase_fract_to_tablerow(dsp_phase)];
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dsp_buf[dsp_i] = dsp_amp *
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(coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
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+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
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+ coeffs[2] * end_point1
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+ coeffs[3] * end_point2);
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/* increment phase and amplitude */
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fluid_phase_incr(dsp_phase, dsp_phase_incr);
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dsp_phase_index = fluid_phase_index(dsp_phase);
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dsp_amp += dsp_amp_incr;
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}
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if(!looping)
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{
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break; /* break out if not looping (end of sample) */
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}
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/* go back to loop start */
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if(dsp_phase_index > end_index)
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{
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fluid_phase_sub_int(dsp_phase, voice->loopend - voice->loopstart);
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if(!voice->has_looped)
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{
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voice->has_looped = 1;
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start_index = voice->loopstart;
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start_point = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 1);
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}
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}
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/* break out if filled buffer */
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if(dsp_i >= FLUID_BUFSIZE)
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{
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break;
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}
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end_index -= 2; /* set end back to third to last sample point */
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}
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voice->phase = dsp_phase;
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voice->amp = dsp_amp;
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return (dsp_i);
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}
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/* 7th order interpolation.
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* Returns number of samples processed (usually FLUID_BUFSIZE but could be
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* smaller if end of sample occurs).
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*/
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int
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fluid_rvoice_dsp_interpolate_7th_order(fluid_rvoice_dsp_t *voice, fluid_real_t *FLUID_RESTRICT dsp_buf, int looping)
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{
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fluid_phase_t dsp_phase = voice->phase;
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fluid_phase_t dsp_phase_incr;
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short int *dsp_data = voice->sample->data;
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char *dsp_data24 = voice->sample->data24;
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fluid_real_t dsp_amp = voice->amp;
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fluid_real_t dsp_amp_incr = voice->amp_incr;
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unsigned int dsp_i = 0;
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unsigned int dsp_phase_index;
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unsigned int start_index, end_index;
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fluid_real_t start_points[3], end_points[3];
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const fluid_real_t *FLUID_RESTRICT coeffs;
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/* Convert playback "speed" floating point value to phase index/fract */
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fluid_phase_set_float(dsp_phase_incr, voice->phase_incr);
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/* add 1/2 sample to dsp_phase since 7th order interpolation is centered on
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* the 4th sample point */
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fluid_phase_incr(dsp_phase, (fluid_phase_t)0x80000000);
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/* last index before 7th interpolation point must be specially handled */
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end_index = (looping ? voice->loopend - 1 : voice->end) - 3;
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if(voice->has_looped) /* set start_index and start point if looped or not */
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{
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start_index = voice->loopstart;
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start_points[0] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 1);
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start_points[1] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 2);
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start_points[2] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 3);
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}
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else
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{
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start_index = voice->start;
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start_points[0] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->start); /* just duplicate the start point */
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start_points[1] = start_points[0];
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start_points[2] = start_points[0];
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}
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/* get the 3 points off the end (loop start if looping, duplicate point if end) */
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if(looping)
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{
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end_points[0] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopstart);
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end_points[1] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopstart + 1);
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end_points[2] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopstart + 2);
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}
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else
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{
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end_points[0] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->end);
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end_points[1] = end_points[0];
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end_points[2] = end_points[0];
|
|
}
|
|
|
|
while(1)
|
|
{
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
|
|
/* interpolate first sample point (start or loop start) if needed */
|
|
for(; dsp_phase_index == start_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
|
|
{
|
|
coeffs = sinc_table7[fluid_phase_fract_to_tablerow(dsp_phase)];
|
|
|
|
dsp_buf[dsp_i] = dsp_amp
|
|
* (coeffs[0] * start_points[2]
|
|
+ coeffs[1] * start_points[1]
|
|
+ coeffs[2] * start_points[0]
|
|
+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
|
|
+ coeffs[4] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
|
|
+ coeffs[5] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 2)
|
|
+ coeffs[6] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 3));
|
|
|
|
/* increment phase and amplitude */
|
|
fluid_phase_incr(dsp_phase, dsp_phase_incr);
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
dsp_amp += dsp_amp_incr;
|
|
}
|
|
|
|
start_index++;
|
|
|
|
/* interpolate 2nd to first sample point (start or loop start) if needed */
|
|
for(; dsp_phase_index == start_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
|
|
{
|
|
coeffs = sinc_table7[fluid_phase_fract_to_tablerow(dsp_phase)];
|
|
|
|
dsp_buf[dsp_i] = dsp_amp
|
|
* (coeffs[0] * start_points[1]
|
|
+ coeffs[1] * start_points[0]
|
|
+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
|
|
+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
|
|
+ coeffs[4] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
|
|
+ coeffs[5] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 2)
|
|
+ coeffs[6] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 3));
|
|
|
|
/* increment phase and amplitude */
|
|
fluid_phase_incr(dsp_phase, dsp_phase_incr);
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
dsp_amp += dsp_amp_incr;
|
|
}
|
|
|
|
start_index++;
|
|
|
|
/* interpolate 3rd to first sample point (start or loop start) if needed */
|
|
for(; dsp_phase_index == start_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
|
|
{
|
|
coeffs = sinc_table7[fluid_phase_fract_to_tablerow(dsp_phase)];
|
|
|
|
dsp_buf[dsp_i] = dsp_amp
|
|
* (coeffs[0] * start_points[0]
|
|
+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 2)
|
|
+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
|
|
+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
|
|
+ coeffs[4] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
|
|
+ coeffs[5] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 2)
|
|
+ coeffs[6] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 3));
|
|
|
|
/* increment phase and amplitude */
|
|
fluid_phase_incr(dsp_phase, dsp_phase_incr);
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
dsp_amp += dsp_amp_incr;
|
|
}
|
|
|
|
start_index -= 2; /* set back to original start index */
|
|
|
|
|
|
/* interpolate the sequence of sample points */
|
|
for(; dsp_i < FLUID_BUFSIZE && dsp_phase_index <= end_index; dsp_i++)
|
|
{
|
|
coeffs = sinc_table7[fluid_phase_fract_to_tablerow(dsp_phase)];
|
|
|
|
dsp_buf[dsp_i] = dsp_amp
|
|
* (coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 3)
|
|
+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 2)
|
|
+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
|
|
+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
|
|
+ coeffs[4] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
|
|
+ coeffs[5] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 2)
|
|
+ coeffs[6] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 3));
|
|
|
|
/* increment phase and amplitude */
|
|
fluid_phase_incr(dsp_phase, dsp_phase_incr);
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
dsp_amp += dsp_amp_incr;
|
|
}
|
|
|
|
/* break out if buffer filled */
|
|
if(dsp_i >= FLUID_BUFSIZE)
|
|
{
|
|
break;
|
|
}
|
|
|
|
end_index++; /* we're now interpolating the 3rd to last point */
|
|
|
|
/* interpolate within 3rd to last point */
|
|
for(; dsp_phase_index <= end_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
|
|
{
|
|
coeffs = sinc_table7[fluid_phase_fract_to_tablerow(dsp_phase)];
|
|
|
|
dsp_buf[dsp_i] = dsp_amp
|
|
* (coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 3)
|
|
+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 2)
|
|
+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
|
|
+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
|
|
+ coeffs[4] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
|
|
+ coeffs[5] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 2)
|
|
+ coeffs[6] * end_points[0]);
|
|
|
|
/* increment phase and amplitude */
|
|
fluid_phase_incr(dsp_phase, dsp_phase_incr);
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
dsp_amp += dsp_amp_incr;
|
|
}
|
|
|
|
end_index++; /* we're now interpolating the 2nd to last point */
|
|
|
|
/* interpolate within 2nd to last point */
|
|
for(; dsp_phase_index <= end_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
|
|
{
|
|
coeffs = sinc_table7[fluid_phase_fract_to_tablerow(dsp_phase)];
|
|
|
|
dsp_buf[dsp_i] = dsp_amp
|
|
* (coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 3)
|
|
+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 2)
|
|
+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
|
|
+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
|
|
+ coeffs[4] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index + 1)
|
|
+ coeffs[5] * end_points[0]
|
|
+ coeffs[6] * end_points[1]);
|
|
|
|
/* increment phase and amplitude */
|
|
fluid_phase_incr(dsp_phase, dsp_phase_incr);
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
dsp_amp += dsp_amp_incr;
|
|
}
|
|
|
|
end_index++; /* we're now interpolating the last point */
|
|
|
|
/* interpolate within last point */
|
|
for(; dsp_phase_index <= end_index && dsp_i < FLUID_BUFSIZE; dsp_i++)
|
|
{
|
|
coeffs = sinc_table7[fluid_phase_fract_to_tablerow(dsp_phase)];
|
|
|
|
dsp_buf[dsp_i] = dsp_amp
|
|
* (coeffs[0] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 3)
|
|
+ coeffs[1] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 2)
|
|
+ coeffs[2] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index - 1)
|
|
+ coeffs[3] * fluid_rvoice_get_float_sample(dsp_data, dsp_data24, dsp_phase_index)
|
|
+ coeffs[4] * end_points[0]
|
|
+ coeffs[5] * end_points[1]
|
|
+ coeffs[6] * end_points[2]);
|
|
|
|
/* increment phase and amplitude */
|
|
fluid_phase_incr(dsp_phase, dsp_phase_incr);
|
|
dsp_phase_index = fluid_phase_index(dsp_phase);
|
|
dsp_amp += dsp_amp_incr;
|
|
}
|
|
|
|
if(!looping)
|
|
{
|
|
break; /* break out if not looping (end of sample) */
|
|
}
|
|
|
|
/* go back to loop start */
|
|
if(dsp_phase_index > end_index)
|
|
{
|
|
fluid_phase_sub_int(dsp_phase, voice->loopend - voice->loopstart);
|
|
|
|
if(!voice->has_looped)
|
|
{
|
|
voice->has_looped = 1;
|
|
start_index = voice->loopstart;
|
|
start_points[0] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 1);
|
|
start_points[1] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 2);
|
|
start_points[2] = fluid_rvoice_get_float_sample(dsp_data, dsp_data24, voice->loopend - 3);
|
|
}
|
|
}
|
|
|
|
/* break out if filled buffer */
|
|
if(dsp_i >= FLUID_BUFSIZE)
|
|
{
|
|
break;
|
|
}
|
|
|
|
end_index -= 3; /* set end back to 4th to last sample point */
|
|
}
|
|
|
|
/* sub 1/2 sample from dsp_phase since 7th order interpolation is centered on
|
|
* the 4th sample point (correct back to real value) */
|
|
fluid_phase_decr(dsp_phase, (fluid_phase_t)0x80000000);
|
|
|
|
voice->phase = dsp_phase;
|
|
voice->amp = dsp_amp;
|
|
|
|
return (dsp_i);
|
|
}
|