91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include "scottie.h"
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#include "image.h"
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#include "sstv.h"
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#include "wav.h"
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#include <stdint.h>
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const scottie_mode_t SCOTTIE_S1 = {
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.vis_code = 0x3C, // 60d
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.width = 320,
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.height = 256,
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.separator_ms = 1.5,
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.sync_ms = 9.0,
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.sync_porch_ms = 1.5,
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.scan_ms = 138.240,
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};
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const scottie_mode_t SCOTTIE_S2 = {
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.vis_code = 0x38, // 56d
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.width = 320,
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.height = 256,
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.separator_ms = 1.5,
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.sync_ms = 9.0,
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.sync_porch_ms = 1.5,
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.scan_ms = 88.064,
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};
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const scottie_mode_t SCOTTIE_DX = {
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.vis_code = 0x4C, // 76d
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.width = 320,
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.height = 256,
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.separator_ms = 1.5,
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.sync_ms = 9.0,
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.sync_porch_ms = 1.5,
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.scan_ms = 345.600,
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};
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static void scan_line_channel(wav_t *wav, uint8_t *line, int width, int channel, double scan_ms) {
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double px_ms = scan_ms / width;
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for (int x = 0; x < width; x++) {
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uint8_t val = line[x * 3 + channel];
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double freq = 1500.0 + val * 3.1372549;
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sstv_tone(wav, freq, px_ms);
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}
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}
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void scottie_encode_image(wav_t *wav, uint8_t *rgb, const scottie_mode_t *mode) {
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for (int y = 0; y < mode->height; y++) {
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uint8_t *line = &rgb[y * mode->width * 3];
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if (y == 0) {
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sstv_tone(wav, 1200.0, mode->sync_ms);
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}
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sstv_tone(wav, 1500.0, mode->separator_ms);
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scan_line_channel(wav, line, mode->width, 1, mode->scan_ms);
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sstv_tone(wav, 1500.0, mode->separator_ms);
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scan_line_channel(wav, line, mode->width, 2, mode->scan_ms);
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sstv_tone(wav, 1200.0, mode->sync_ms);
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sstv_tone(wav, 1500.0, mode->sync_porch_ms);
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scan_line_channel(wav, line, mode->width, 0, mode->scan_ms);
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}
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}
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int sstv_encode_scottie(const char *input_image, const char *output_wav, const scottie_mode_t *mode) {
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image_t img, resized;
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wav_t wav;
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if (!image_load(&img, input_image))
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return 0;
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if (!image_resize(&img, &resized, mode->width, mode->height)) {
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image_free(&img);
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return 0;
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}
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if (!wave_open(&wav, output_wav, 44100)) {
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image_free(&img);
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image_free_raw(&resized);
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return 0;
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}
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sstv_vis_header_ex(&wav, mode->vis_code);
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scottie_encode_image(&wav, resized.data, mode);
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wave_close(&wav);
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image_free(&img);
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image_free_raw(&resized);
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return 1;
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}
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