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/* display wave form functions
*
* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "sender.h"
#define DISPLAY_INTERVAL 0.04
#define WIDTH 80
#define HEIGHT 10
static char screen[HEIGHT][WIDTH+1];
static int wave_on = 0;
void display_wave_init(sender_t *sender, int samplerate)
{
dispwav_t *disp = &sender->dispwav;
memset(disp, 0, sizeof(*disp));
disp->interval_max = (double)samplerate * DISPLAY_INTERVAL + 0.5;
}
void display_wave_on(int on)
{
int j;
if (on < 0)
wave_on = 1 - wave_on;
else
wave_on = on;
memset(&screen, ' ', sizeof(screen));
printf("\0337\033[H");
for (j = 0; j < HEIGHT; j++) {
screen[j][WIDTH] = '\0';
puts(screen[j]);
}
printf("\0338"); fflush(stdout);
}
void display_wave(sender_t *sender, int16_t *samples, int length)
{
dispwav_t *disp = &sender->dispwav;
int pos, max;
int16_t *buffer;
int i, j, y;
if (!wave_on)
return;
pos = disp->interval_pos;
max = disp->interval_max;
buffer = disp->buffer;
for (i = 0; i < length; i++) {
if (pos >= WIDTH) {
if (++pos == max)
pos = 0;
continue;
}
buffer[pos++] = samples[i];
if (pos == WIDTH) {
memset(&screen, ' ', sizeof(screen));
for (j = 0; j < WIDTH; j++) {
/* must divide by 65536, because we may never reach HEIGHT*2! */
y = (32767 - (int)buffer[j]) * HEIGHT * 2 / 65536;
screen[y >> 1][j] = (y & 1) ? '_' : '-';
}
printf("\0337\033[H");
for (j = 0; j < HEIGHT; j++) {
screen[j][WIDTH] = '\0';
puts(screen[j]);
}
printf("\0338"); fflush(stdout);
}
}
disp->interval_pos = pos;
}
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