kopia lustrzana https://github.com/xdsopl/robot36
244 wiersze
7.8 KiB
C
244 wiersze
7.8 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 "mmap_file.h"
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#include "yuv.h"
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#include "utils.h"
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typedef struct {
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uint32_t ChunkID;
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uint32_t ChunkSize;
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uint32_t Format;
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uint32_t Subchunk1ID;
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uint32_t Subchunk1Size;
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uint16_t AudioFormat;
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uint16_t NumChannels;
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uint32_t SampleRate;
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uint32_t ByteRate;
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uint16_t BlockAlign;
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uint16_t BitsPerSample;
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uint32_t Subchunk2ID;
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uint32_t Subchunk2Size;
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} wav_t;
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short *buffer;
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complex float nco;
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int sample;
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float hz2rad;
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void add_sample(float val) {
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// static float avg = 0.0;
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// const float a = 0.9;
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// avg = a * val + (1.0 - a) * avg;
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// buffer[sample++] = (float)SHRT_MAX * avg;
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buffer[sample++] = (float)SHRT_MAX * val;
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// buffer[sample++] = (float)SHRT_MAX * avg + random() / (RAND_MAX / 10000);
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}
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void add_freq(float freq) {
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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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int main(int argc, char **argv)
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{
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if (argc != 4) {
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fprintf(stderr, "usage: %s <input.ppm> <output.wav> <rate>\n", argv[0]);
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return 1;
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}
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size_t ppm_size;
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void *ppm_p;
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if (!mmap_file_ro(&ppm_p, argv[1], &ppm_size)) {
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fprintf(stderr, "couldnt open ppm file\n");
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return 1;
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}
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const int width = 320;
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const int height = 240;
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const char *ppm_head = "P6 320 240 255\n";
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if (strncmp(ppm_head, ppm_p, strlen(ppm_head))) {
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fprintf(stderr, "unsupported image file\n");
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return 1;
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}
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uint8_t *pixel = (uint8_t *)ppm_p + strlen(ppm_head);
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float rate = atoi(argv[3]);
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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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size_t wav_size = 4096 * ((size_t)(37.5 * rate * 2 + 44 + 4095) / 4096);
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int samples = (wav_size - 44) / 2;
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void *wav_p;
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if (!mmap_file_rw(&wav_p, argv[2], wav_size)) {
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fprintf(stderr, "couldnt open wav file\n");
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return 1;
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}
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buffer = (short *)(wav_p + sizeof(wav_t));
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sample = 0;
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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 < height; y++) {
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// EVEN LINES
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// SYNC
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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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// PORCH
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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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// Y
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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 * width + 3 * x0;
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int off1 = 3 * y * width + 3 * x1;
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uint8_t R0 = pixel[off0 + 0];
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uint8_t G0 = pixel[off0 + 1];
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uint8_t B0 = pixel[off0 + 2];
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uint8_t R1 = pixel[off1 + 0];
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uint8_t G1 = pixel[off1 + 1];
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uint8_t B1 = 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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// EVEN
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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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// PORCH
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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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// V
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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 * width + 6 * x0;
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int evn1 = 3 * y * width + 6 * x1;
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int odd0 = 3 * (y + 1) * width + 6 * x0;
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int odd1 = 3 * (y + 1) * width + 6 * x1;
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uint8_t R0 = (pixel[evn0 + 0] + pixel[odd0 + 0] + pixel[evn0 + 3] + pixel[odd0 + 3]) / 4;
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uint8_t G0 = (pixel[evn0 + 1] + pixel[odd0 + 1] + pixel[evn0 + 4] + pixel[odd0 + 4]) / 4;
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uint8_t B0 = (pixel[evn0 + 2] + pixel[odd0 + 2] + pixel[evn0 + 5] + pixel[odd0 + 5]) / 4;
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uint8_t R1 = (pixel[evn1 + 0] + pixel[odd1 + 0] + pixel[evn1 + 3] + pixel[odd1 + 3]) / 4;
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uint8_t G1 = (pixel[evn1 + 1] + pixel[odd1 + 1] + pixel[evn1 + 4] + pixel[odd1 + 4]) / 4;
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uint8_t B1 = (pixel[evn1 + 2] + pixel[odd1 + 2] + pixel[evn1 + 5] + 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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// ODD LINES
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y++;
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// SYNC
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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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// PORCH
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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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// Y
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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 * width + 3 * x0;
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int off1 = 3 * y * width + 3 * x1;
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uint8_t R0 = pixel[off0 + 0];
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uint8_t G0 = pixel[off0 + 1];
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uint8_t B0 = pixel[off0 + 2];
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uint8_t R1 = pixel[off1 + 0];
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uint8_t G1 = pixel[off1 + 1];
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uint8_t B1 = 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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// ODD
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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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// PORCH
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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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// U
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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) * width + 6 * x0;
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int evn1 = 3 * (y - 1) * width + 6 * x1;
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int odd0 = 3 * y * width + 6 * x0;
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int odd1 = 3 * y * width + 6 * x1;
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uint8_t R0 = (pixel[evn0 + 0] + pixel[odd0 + 0] + pixel[evn0 + 3] + pixel[odd0 + 3]) / 4;
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uint8_t G0 = (pixel[evn0 + 1] + pixel[odd0 + 1] + pixel[evn0 + 4] + pixel[odd0 + 4]) / 4;
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uint8_t B0 = (pixel[evn0 + 2] + pixel[odd0 + 2] + pixel[evn0 + 5] + pixel[odd0 + 5]) / 4;
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uint8_t R1 = (pixel[evn1 + 0] + pixel[odd1 + 0] + pixel[evn1 + 3] + pixel[odd1 + 3]) / 4;
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uint8_t G1 = (pixel[evn1 + 1] + pixel[odd1 + 1] + pixel[evn1 + 4] + pixel[odd1 + 4]) / 4;
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uint8_t B1 = (pixel[evn1 + 2] + pixel[odd1 + 2] + pixel[evn1 + 5] + 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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while (sample < samples)
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add_sample(0.0);
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wav_t *wav = (wav_t *)wav_p;
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wav->ChunkID = 0x46464952;
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wav->ChunkSize = 36 + 2 * samples;
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wav->Format = 0x45564157;
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wav->Subchunk1ID = 0x20746d66;
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wav->Subchunk1Size = 16;
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wav->AudioFormat = 1;
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wav->NumChannels = 1;
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wav->SampleRate = rate;
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wav->ByteRate = 2 * rate;
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wav->BlockAlign = 2;
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wav->BitsPerSample = 16;
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wav->Subchunk2ID = 0x61746164;
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wav->Subchunk2Size = 2 * samples;
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munmap_file(wav_p, wav_size);
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munmap_file(ppm_p, ppm_size);
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return 0;
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}
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