kopia lustrzana https://github.com/xdsopl/robot36
204 wiersze
6.3 KiB
C
204 wiersze
6.3 KiB
C
/*
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robot36 - encode and decode images using SSTV in Robot 36 mode
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Written in 2011 by <Ahmet Inan> <xdsopl@googlemail.com>
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To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide. This software is distributed without any warranty.
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You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <complex.h>
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#include <limits.h>
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#include "yuv.h"
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#include "utils.h"
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#include "pcm.h"
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#include "img.h"
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struct img *img;
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struct pcm *pcm;
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complex float nco;
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float hz2rad;
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int channels;
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short *buff;
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float rate = 48000;
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int add_sample(float val)
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{
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for (int i = 0; i < channels; i++)
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buff[i] = (float)SHRT_MAX * val;
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return write_pcm(pcm, buff, 1);
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}
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void add_freq(float freq)
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{
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add_sample(creal(nco));
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nco *= cexpf(freq * hz2rad * I);
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}
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void hor_sync()
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{
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for (int ticks = 0; ticks < (int)(0.009 * rate); ticks++)
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add_freq(1200.0);
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}
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void sync_porch()
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{
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for (int ticks = 0; ticks < (int)(0.003 * rate); ticks++)
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add_freq(1500.0);
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}
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void porch()
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{
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for (int ticks = 0; ticks < (int)(0.0015 * rate); ticks++)
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add_freq(1900.0);
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}
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void even_seperator()
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{
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for (int ticks = 0; ticks < (int)(0.0045 * rate); ticks++)
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add_freq(1500.0);
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}
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void odd_seperator()
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{
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for (int ticks = 0; ticks < (int)(0.0045 * rate); ticks++)
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add_freq(2300.0);
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}
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void y_scan(int y)
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{
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for (int ticks = 0; ticks < (int)(0.088 * rate); ticks++) {
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float xf = fclampf((320.0 * (float)ticks) / (0.088 * rate), 0.0, 319.0);
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int x0 = xf;
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int x1 = fclampf(x0 + 1, 0.0, 319.0);
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int off0 = 3 * y * img->width + 3 * x0;
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int off1 = 3 * y * img->width + 3 * x1;
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uint8_t R0 = img->pixel[off0 + 0];
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uint8_t G0 = img->pixel[off0 + 1];
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uint8_t B0 = img->pixel[off0 + 2];
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uint8_t R1 = img->pixel[off1 + 0];
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uint8_t G1 = img->pixel[off1 + 1];
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uint8_t B1 = img->pixel[off1 + 2];
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uint8_t R = flerpf(R0, R1, xf - (float)x0);
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uint8_t G = flerpf(G0, G1, xf - (float)x0);
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uint8_t B = flerpf(B0, B1, xf - (float)x0);
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add_freq(1500.0 + 800.0 * Y_RGB(R, G, B) / 255.0);
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}
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}
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void v_scan(int y)
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{
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for (int ticks = 0; ticks < (int)(0.044 * rate); ticks++) {
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float xf = fclampf((160.0 * (float)ticks) / (0.044 * rate), 0.0, 159.0);
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int x0 = xf;
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int x1 = fclampf(x0 + 1, 0.0, 159.0);
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int evn0 = 3 * y * img->width + 6 * x0;
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int evn1 = 3 * y * img->width + 6 * x1;
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int odd0 = 3 * (y + 1) * img->width + 6 * x0;
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int odd1 = 3 * (y + 1) * img->width + 6 * x1;
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uint8_t R0 = (img->pixel[evn0 + 0] + img->pixel[odd0 + 0] + img->pixel[evn0 + 3] + img->pixel[odd0 + 3]) / 4;
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uint8_t G0 = (img->pixel[evn0 + 1] + img->pixel[odd0 + 1] + img->pixel[evn0 + 4] + img->pixel[odd0 + 4]) / 4;
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uint8_t B0 = (img->pixel[evn0 + 2] + img->pixel[odd0 + 2] + img->pixel[evn0 + 5] + img->pixel[odd0 + 5]) / 4;
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uint8_t R1 = (img->pixel[evn1 + 0] + img->pixel[odd1 + 0] + img->pixel[evn1 + 3] + img->pixel[odd1 + 3]) / 4;
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uint8_t G1 = (img->pixel[evn1 + 1] + img->pixel[odd1 + 1] + img->pixel[evn1 + 4] + img->pixel[odd1 + 4]) / 4;
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uint8_t B1 = (img->pixel[evn1 + 2] + img->pixel[odd1 + 2] + img->pixel[evn1 + 5] + img->pixel[odd1 + 5]) / 4;
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uint8_t R = flerpf(R0, R1, xf - (float)x0);
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uint8_t G = flerpf(G0, G1, xf - (float)x0);
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uint8_t B = flerpf(B0, B1, xf - (float)x0);
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add_freq(1500.0 + 800.0 * V_RGB(R, G, B) / 255.0);
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}
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}
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void u_scan(int y)
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{
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for (int ticks = 0; ticks < (int)(0.044 * rate); ticks++) {
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float xf = fclampf((160.0 * (float)ticks) / (0.044 * rate), 0.0, 159.0);
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int x0 = xf;
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int x1 = fclampf(x0 + 1, 0.0, 159.0);
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int evn0 = 3 * (y - 1) * img->width + 6 * x0;
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int evn1 = 3 * (y - 1) * img->width + 6 * x1;
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int odd0 = 3 * y * img->width + 6 * x0;
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int odd1 = 3 * y * img->width + 6 * x1;
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uint8_t R0 = (img->pixel[evn0 + 0] + img->pixel[odd0 + 0] + img->pixel[evn0 + 3] + img->pixel[odd0 + 3]) / 4;
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uint8_t G0 = (img->pixel[evn0 + 1] + img->pixel[odd0 + 1] + img->pixel[evn0 + 4] + img->pixel[odd0 + 4]) / 4;
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uint8_t B0 = (img->pixel[evn0 + 2] + img->pixel[odd0 + 2] + img->pixel[evn0 + 5] + img->pixel[odd0 + 5]) / 4;
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uint8_t R1 = (img->pixel[evn1 + 0] + img->pixel[odd1 + 0] + img->pixel[evn1 + 3] + img->pixel[odd1 + 3]) / 4;
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uint8_t G1 = (img->pixel[evn1 + 1] + img->pixel[odd1 + 1] + img->pixel[evn1 + 4] + img->pixel[odd1 + 4]) / 4;
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uint8_t B1 = (img->pixel[evn1 + 2] + img->pixel[odd1 + 2] + img->pixel[evn1 + 5] + img->pixel[odd1 + 5]) / 4;
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uint8_t R = flerpf(R0, R1, xf - (float)x0);
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uint8_t G = flerpf(G0, G1, xf - (float)x0);
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uint8_t B = flerpf(B0, B1, xf - (float)x0);
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add_freq(1500.0 + 800.0 * U_RGB(R, G, B) / 255.0);
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}
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}
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int main(int argc, char **argv)
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{
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if (argc < 2) {
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fprintf(stderr, "usage: %s <input.ppm> <output.wav|default|hw:?,?> <rate>\n", argv[0]);
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return 1;
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}
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if (!open_img_read(&img, argv[1]))
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return 1;
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if (320 != img->width || 240 != img->height) {
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fprintf(stderr, "image not 320x240\n");
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close_img(img);
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return 1;
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}
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char *pcm_name = "default";
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if (argc > 2)
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pcm_name = argv[2];
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if (argc > 3)
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rate = atoi(argv[3]);
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if (!open_pcm_write(&pcm, pcm_name, rate, 1, 37.5))
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return 1;
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rate = rate_pcm(pcm);
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channels = channels_pcm(pcm);
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buff = (short *)malloc(sizeof(short)*channels);
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info_pcm(pcm);
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if (fabsf(0.0015 * rate - (int)(0.0015 * rate)) > 0.0001)
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fprintf(stderr, "this rate will not give accurate (smooth) results.\ntry 40000Hz and resample to %0.fHz\n", rate);
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hz2rad = (2.0 * M_PI) / rate;
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nco = -I * 0.7;
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enum { N = 13 };
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float seq_freq[N] = { 1900.0, 1200.0, 1900.0, 1200.0, 1300.0, 1300.0, 1300.0, 1100.0, 1300.0, 1300.0, 1300.0, 1100.0, 1200.0 };
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float seq_time[N] = { 0.3, 0.01, 0.3, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03 };
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for (int ticks = 0; ticks < (int)(0.3 * rate); ticks++)
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add_sample(0.0);
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for (int i = 0; i < N; i++)
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for (int ticks = 0; ticks < (int)(seq_time[i] * rate); ticks++)
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add_freq(seq_freq[i]);
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for (int y = 0; y < img->height; y++) {
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// EVEN LINES
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hor_sync();
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sync_porch();
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y_scan(y);
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even_seperator();
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porch();
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v_scan(y);
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// ODD LINES
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y++;
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hor_sync();
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sync_porch();
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y_scan(y);
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odd_seperator();
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porch();
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u_scan(y);
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}
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while (add_sample(0.0));
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close_pcm(pcm);
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close_img(img);
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return 0;
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}
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