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pro3_wavetable.h
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pro3_wavetable.h
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/* pro_wavetable.h
* (c) 2020, The Beige Maze Project
*
* pro3_wavetable.h provides functions for generating wavetable system
* exclusive data for the Sequential Pro 3 synthesizer.
*
s */
#include "sequential_packing.h"
#include "pcm_proc.h"
#define PCM_MAX 176000
#define PRO3_SAMPLE_SIZE 1024
#define PRO3_WAVES 16
/* A Wavetable is a set of 16 reference waveforms represented as PCM */
typedef struct _Wavetable {
pcm_sample_t ref[PRO3_WAVES][PRO3_SAMPLE_SIZE];
int isset[PRO3_WAVES];
} Wavetable;
/* Function declarations */
Wavetable new_Wavetable();
void set_reference(Wavetable *table, PCMData *reference, int num);
void wavetable_fill(Wavetable *table);
void wavetable_sysex_dump(Wavetable *table, int num, char *name);
void wavetable_pcm_dump(Wavetable *table);
/* Create a new empty PRO 3 wavetable */
Wavetable new_Wavetable()
{
Wavetable table;
int i;
for (i = 0; i < PRO3_WAVES; i++)
{
table.isset[i] = 0;
int j;
for (j = 0; j < PRO3_SAMPLE_SIZE; j++) table.ref[i][j] = 0;
}
return table;
}
/* Insert a PCM waveform into a Wavetable
* Prior to insertion, set waveform to 16-bit, 1024 samples
*/
void set_reference(Wavetable *table, PCMData *reference, int num)
{
PCMData clone = pcm_clone(reference);
if (clone.size != PRO3_SAMPLE_SIZE) pcm_change_size(&clone, PRO3_SAMPLE_SIZE);
if (clone.resolution != 16) pcm_change_resolution(&clone, 16);
int i;
for (i = 0; i < PRO3_SAMPLE_SIZE; i++)
{
table->ref[num][i] = clone.data[i];
}
table->isset[num] = 1;
return;
}
/* Fill in empty reference waveforms by morphing with linear interpolation.
* At least one reference waveform must be set in 0
*/
void wavetable_fill(Wavetable *table)
{
/* If the first waveform isn't set, return return without doing anything */
if (table->isset[0] == 0) return;
/* If the last waveform isn't set, fill the last position with the first wave */
if (table->isset[PRO3_WAVES - 1] == 0) {
int i;
for (i = 0; i < PRO3_SAMPLE_SIZE; i++)
{
table->ref[PRO3_WAVES - 1][i] = table->ref[0][i];
}
table->isset[PRO3_WAVES - 1] = 1;
}
int c;
for (c = 1; c < 16; c++) /* c = current index */
{
if (table->isset[c] == 0) {
/* There's no waveform here, so it needs to be filled */
int n;
for (n = c; n < 16; n++) /* n = next index */
{
if (table->isset[n] == 1) {
/* This is the next set waveform with data, so fill every waveform
* between the current one and this one */
int t;
for (t = c; t < n; t++) /* t = target index */
{
float div = n - c; /* Number of reference waves in range */
float ix = t - c + 1; /* Index of target within the range */
float scale = ix / div;
int i;
for (i = 0; i < PRO3_SAMPLE_SIZE; i++)
{
float pcm_diff = table->ref[n][i] - table->ref[c-1][i];
float v = table->ref[c-1][i] + (pcm_diff * scale);
table->ref[t][i] = (pcm_sample_t) v;
}
}
break;
}
}
}
}
return;
}
void wavetable_sysex_dump(Wavetable *table, int num, char *name)
{
/* PCM data is signed, while the dsi_packing tools require data to be unsigned. So,
* conversion must be done. First, I cast each sample to an int16_t to guarantee that
* it's a 16-bit signed integer. Then, I divide the 16-bit word into bytes and
* place them, big-endian, into an pro3 data array.
*/
unsigned int pro3_data[PCM_MAX];
unsigned long int i; /* i is the index within the PCM data */
unsigned long int dx = 0; /* dx is the index within the Pro 3 data */
uint16_t checksum = 0;
int k;
for (k = 0; k < 16; k++)
{
PCMData pcm = new_PCMData();
set_pcm_data(&pcm, PRO3_SAMPLE_SIZE, table->ref[k]);
for (i = 0; i < pcm.size; i++)
{
int16_t sample = (int16_t)pcm.data[i];
/* Convert the signed 16-bit sample into a high and low byte */
pro3_data[dx++] = (sample) >> 8; /* High byte */
pro3_data[dx++] = (sample) & 0xff; /* Low byte */
uint16_t check = (((uint16_t) sample >> 8) | ((uint16_t) sample << 8));
checksum += check;
}
/* Downsample to a 512-word waveform */
pcm_change_size(&pcm, PRO3_SAMPLE_SIZE / 2);
for (i = 0; i < pcm.size; i++)
{
int16_t sample = (int16_t)pcm.data[i];
pro3_data[dx++] = (sample) >> 8; /* High byte */
pro3_data[dx++] = (sample) & 0xff; /* Low byte */
uint16_t check = (((uint16_t) sample >> 8) | ((uint16_t) sample << 8));
checksum += check;
}
/* Downsample to a 256-word waveform and add it twice */
pcm_change_size(&pcm, PRO3_SAMPLE_SIZE / 4);
int j;
for (j = 0; j < 2; j++)
{
for (i = 0; i < pcm.size; i++)
{
int16_t sample = (int16_t)pcm.data[i];
pro3_data[dx++] = (sample) >> 8; /* High byte */
pro3_data[dx++] = (sample) & 0xff; /* Low byte */
uint16_t check = (((uint16_t) sample >> 8) | ((uint16_t) sample << 8));
checksum += check;
}
}
/* Downsample to a 128-word waveform and add it eight times */
pcm_change_size(&pcm, PRO3_SAMPLE_SIZE / 8);
for (j = 0; j < 8; j++)
{
for (i = 0; i < pcm.size; i++)
{
int16_t sample = (int16_t)pcm.data[i];
pro3_data[dx++] = (sample) >> 8; /* High byte */
pro3_data[dx++] = (sample) & 0xff; /* Low byte */
uint16_t check = (((uint16_t) sample >> 8) | ((uint16_t) sample << 8));
checksum += check;
}
}
}
/* Use dsi_packing tools to convert the sample data into DSI's packed format */
UnpackedData pro3_wavetable;
Seq_set(&pro3_wavetable, dx, pro3_data);
PackedData pro3_sysex = Seq_pack(pro3_wavetable);
/* Send the actual SysEx to standard output */
putchar(0xf0); /* Start SysEx */
putchar(0x01); /* DSI */
putchar(0x31); /* Pro3 */
putchar(0x6a);
putchar(0x6c);
putchar(0x01);
putchar(0x6b);
putchar(num);
while (strlen(name) < 8) strcat(name, " "); /* Enforce 8 characters */
printf("%.8s", name);
putchar(0x00);
Seq_dump(pro3_sysex);
putchar((char) (checksum & 0x7f));
putchar((char) (checksum >> 8) & 0x7f);
putchar(0xf7); /* End SysEx */
}
void wavetable_pcm_dump(Wavetable *table)
{
int r;
for (r = 0; r < PRO3_WAVES; r++)
{
int s;
for (s = 0; s < PRO3_SAMPLE_SIZE; s++)
{
pcm_sample_t sample = table->ref[r][s];
/* Convert the signed 16-bit sample into a high and low byte */
char hi = (sample) >> 8; /* High byte */
char lo = (sample) & 0xff; /* Low byte */
putchar(hi);
putchar(lo);
}
}
}
/*
* Copyright (c) 2020 The Beige Maze Project
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/