108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/* display wave form functions
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*
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* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "sender.h"
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#define DISPLAY_INTERVAL 0.04
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#define WIDTH 80
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#define HEIGHT 10
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static int num_sender = 0;
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static char screen[HEIGHT][WIDTH+1];
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static int wave_on = 0;
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void display_wave_init(sender_t *sender, int samplerate)
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{
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dispwav_t *disp = &sender->dispwav;
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memset(disp, 0, sizeof(*disp));
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disp->offset = (num_sender++) * HEIGHT;
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disp->interval_max = (double)samplerate * DISPLAY_INTERVAL + 0.5;
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}
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void display_wave_on(int on)
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{
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int i, j;
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if (on < 0)
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wave_on = 1 - wave_on;
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else
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wave_on = on;
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memset(&screen, ' ', sizeof(screen));
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printf("\0337\033[H");
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for (i = 0; i < num_sender; i++) {
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for (j = 0; j < HEIGHT; j++) {
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screen[j][WIDTH] = '\0';
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puts(screen[j]);
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}
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}
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printf("\0338"); fflush(stdout);
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}
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void display_wave(sender_t *sender, int16_t *samples, int length)
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{
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dispwav_t *disp = &sender->dispwav;
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int pos, max;
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int16_t *buffer;
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int i, j, y;
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if (!wave_on)
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return;
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pos = disp->interval_pos;
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max = disp->interval_max;
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buffer = disp->buffer;
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for (i = 0; i < length; i++) {
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if (pos >= WIDTH) {
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if (++pos == max)
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pos = 0;
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continue;
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}
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buffer[pos++] = samples[i];
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if (pos == WIDTH) {
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memset(&screen, ' ', sizeof(screen));
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for (j = 0; j < WIDTH; j++) {
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/* must divide by 65536, because we may never reach HEIGHT*2! */
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y = (32767 - (int)buffer[j]) * HEIGHT * 2 / 65536;
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screen[y >> 1][j] = (y & 1) ? '_' : '-';
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}
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sprintf(screen[0], "(chan %d", sender->kanal);
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*strchr(screen[0], '\0') = ')';
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printf("\0337\033[H");
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for (j = 0; j < disp->offset; j++)
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puts("");
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for (j = 0; j < HEIGHT; j++) {
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screen[j][WIDTH] = '\0';
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puts(screen[j]);
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}
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printf("\0338"); fflush(stdout);
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}
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}
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disp->interval_pos = pos;
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}
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