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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 <pthread.h>
#include <math.h>
#include <sys/ioctl.h>
#include "../libsample/sample.h"
#include "../libdebug/debug.h"
#include "../libdisplay/display.h"
#define HEIGHT 11
static int num_sender = 0;
static char screen[HEIGHT][MAX_DISPLAY_WIDTH];
static int wave_on = 0;
void display_wave_init(dispwav_t *disp, int samplerate, const char *kanal)
{
memset(disp, 0, sizeof(*disp));
disp->offset = (num_sender++) * HEIGHT;
disp->interval_max = (double)samplerate * DISPLAY_INTERVAL + 0.5;
disp->kanal = kanal;
}
void display_wave_on(int on)
{
int i, j;
int w, h;
get_win_size(&w, &h);
if (wave_on) {
memset(&screen, ' ', sizeof(screen));
printf("\0337\033[H");
for (i = 0; i < num_sender; i++) {
for (j = 0; j < HEIGHT; j++) {
screen[j][w] = '\0';
puts(screen[j]);
}
}
printf("\0338"); fflush(stdout);
}
if (on < 0)
wave_on = 1 - wave_on;
else
wave_on = on;
if (wave_on)
debug_limit_scroll = HEIGHT * num_sender;
else
debug_limit_scroll = 0;
}
/*
* draw wave form:
*
* theoretical example: HEIGHT = 3 allows 5 steps
*
* Line 0: '.
* Line 1: '.
* Line 2: '
*
* HEIGHT is odd, so the center line's char is ''' (otherwise '.')
* (HEIGHT - 1) / 2 = 1, so the center line is drawn in line 1
*
* y is in range of 0..4, so these are 5 steps, where 2 is the
* center line. this is calculated by (HEIGHT * 2 - 1)
*/
void display_wave(dispwav_t *disp, sample_t *samples, int length, double range)
{
int pos, max;
sample_t *buffer;
int i, j, k, s, e;
double last, current, next;
int color = 9; /* default color */
int center_line;
char center_char;
int width, h;
if (!wave_on)
return;
get_win_size(&width, &h);
/* at what line we draw our zero-line and what character we use */
center_line = (HEIGHT - 1) >> 1;
center_char = (HEIGHT & 1) ? '\'' : '.';
pos = disp->interval_pos;
max = disp->interval_max;
buffer = disp->buffer;
for (i = 0; i < length; i++) {
if (pos >= width + 2) {
if (++pos == max)
pos = 0;
continue;
}
buffer[pos++] = samples[i];
if (pos == width + 2) {
memset(&screen, ' ', sizeof(screen));
for (j = 0; j < width; j++) {
/* Input value is scaled to range -1 .. 1 and then subtracted from 1,
* so the result ranges from 0 .. 2.
* HEIGHT-1 is multiplied with the range, so a HEIGHT of 3 would allow
* 0..4 (5 steps) and a HEIGHT of 11 would allow 0..20 (21 steps).
* We always use odd number of steps, so there will be a center between
* values.
*/
last = (1.0 - buffer[j] / range) * (double)(HEIGHT - 1);
current = (1.0 - buffer[j + 1] / range) * (double)(HEIGHT - 1);
next = (1.0 - buffer[j + 2] / range) * (double)(HEIGHT - 1);
/* calculate start and end for vertical line
* if the current value is a peak (above or below last AND next point),
* round this peak point to become one end of the vertical line.
* the other end is rounded up or down, so the end of the line will
* not overlap with the ends of the surrounding lines.
*/
if (last > current) {
if (next > current) {
/* current point is a peak up */
s = round(current);
/* use lowest neighbor point and end is half way */
if (last > next)
e = floor((last + current) / 2.0);
else
e = floor((next + current) / 2.0);
/* end point must not be above start point */
if (e < s)
e = s;
} else {
/* current point is a transition upwards */
s = ceil((next + current) / 2.0);
e = floor((last + current) / 2.0);
/* end point must not be above start point */
if (e < s)
s = e = round(current);
}
} else {
if (next <= current) {
/* current point is a peak down */
e = round(current);
/* use heighes neighbor point and start is half way */
if (last <= next)
s = ceil((last + current) / 2.0);
else
s = ceil((next + current) / 2.0);
/* start point must not be below end point */
if (s > e)
s = e;
} else {
/* current point is a transition downwards */
s = ceil((last + current) / 2.0);
e = floor((next + current) / 2.0);
/* start point must not be below end point */
if (s > e)
s = e = round(current);
}
}
/* only draw line, if it is in range */
if (e >= 0 && s < HEIGHT * 2 - 1) {
/* clip */
if (s < 0)
s = 0;
if (e >= HEIGHT * 2 - 1)
e = HEIGHT * 2 - 1;
/* plot start and end point */
if ((s & 1))
screen[s >> 1][j] = '.';
else if (e != s)
screen[s >> 1][j] = '|';
if (!(e & 1))
screen[e >> 1][j] = '\'';
else if (e != s)
screen[e >> 1][j] = '|';
/* plot line between start and end point */
for (k = (s >> 1) + 1; k < (e >> 1); k++)
screen[k][j] = '|';
}
}
sprintf(screen[0], "(chan %s", disp->kanal);
*strchr(screen[0], '\0') = ')';
printf("\0337\033[H");
for (j = 0; j < disp->offset; j++)
puts("");
for (j = 0; j < HEIGHT; j++) {
for (k = 0; k < width; k++) {
if (j == center_line && screen[j][k] == ' ') {
/* blue 0-line */
if (color != 4) {
color = 4;
printf("\033[0;34m");
}
putchar(center_char);
} else if (screen[j][k] == '\'' || screen[j][k] == '.' || screen[j][k] == '|') {
/* green scope curve */
if (color != 2) {
color = 2;
printf("\033[1;32m");
}
putchar(screen[j][k]);
} else if (screen[j][k] != ' ') {
/* white other characters */
if (color != 7) {
color = 7;
printf("\033[1;37m");
}
putchar(screen[j][k]);
} else
putchar(screen[j][k]);
}
printf("\n");
}
/* reset color and position */
printf("\033[0;39m\0338"); fflush(stdout);
}
}
disp->interval_pos = pos;
}
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