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mayhem-firmware/firmware/baseband/proc_sstvrx.cpp
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StarVore Labs f71f19e719 Addition of SSTV RX application (#2888)
2025-12-17 13:14:19 +01:00

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/*
* Copyright (C) 2025 StarVore Labs
*
* This file is part of PortaPack.
*
* 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 2, 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_sstvrx.hpp"
#include "event_m4.hpp"
#include "portapack_shared_memory.hpp"
#include "audio_dma.hpp"
#include "sine_table_int8.hpp"
#include "fxpt_atan2.hpp"
#include "message.hpp"
#include <cstdint>
#include <cmath>
#include <cstddef>
#include <cstring>
#include <algorithm>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
namespace {
constexpr size_t sstv_shared_buffer_bytes = sizeof(shared_memory.bb_data.data);
constexpr size_t sstv_chunk_flag_index = sstv_shared_buffer_bytes - 1; // Reserve last byte as ownership flag
constexpr size_t sstv_chunk_header_bytes = 2;
constexpr size_t sstv_chunk_copy_bytes = sstv_shared_buffer_bytes - 1; // Bytes copied to M0 (excludes flag)
constexpr uint16_t sstv_max_chunk_pixels = (sstv_chunk_copy_bytes - sstv_chunk_header_bytes) / 3;
inline volatile uint8_t& chunk_flag() {
return *reinterpret_cast<volatile uint8_t*>(&shared_memory.bb_data.data[sstv_chunk_flag_index]);
}
inline void wait_for_chunk_slot() {
while (chunk_flag() != 0) {
__asm__ volatile("nop");
}
}
inline void mark_chunk_ready() {
chunk_flag() = 1;
}
inline const sstv_mode* find_mode_by_vis_code(const uint8_t vis_code) {
for (const auto& mode : sstv_modes) {
if (mode.vis_code == vis_code) {
return &mode;
}
}
return nullptr;
}
inline std::array<uint8_t, 3> color_order_for_mode(const sstv_mode& mode) {
switch (mode.color_sequence) {
case SSTV_COLOR_RGB:
return {0, 1, 2};
case SSTV_COLOR_GBR:
return {1, 2, 0};
default:
return {0, 1, 2};
}
}
} // namespace
void SSTVRXProcessor::execute(const buffer_c8_t& buffer) {
if (!configured) {
// Just return silently if not configured
return;
}
// Decimation chain (same as NFM)
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto channel = channel_filter.execute(decim_1_out, dst_buffer);
feed_channel_stats(channel);
// FM demodulation and audio processing
// Demodulator outputs 24kHz audio after channel filter decimation
auto audio = demod.execute(channel, work_audio_buffer);
// Feed audio samples to output and use for frequency estimation
audio_output.write(audio);
// Process each audio sample for SSTV decoding
// audio is buffer_s16_t, so audio.p[i] is int16_t
for (size_t i = 0; i < audio.count; i++) {
// Get int16 audio sample directly (no float conversion needed)
int32_t audio_sample = audio.p[i];
// Increment global sample counter for calibration
global_sample_count++;
// Estimate frequency using Goertzel algorithm on the audio tones
estimate_frequency_goertzel(audio_sample);
// Process based on current state
switch (state) {
case STATE_SYNC_SEARCH:
// Before Line 0: wait for initial sync pulses to establish timing
if (current_line == 0) {
detect_sync(current_freq);
}
// After Line 0 started: we're at end of a line, waiting for next sync
// Just wait - the sync will be detected and we'll transition to separator
else {
detect_sync(current_freq);
}
break;
case STATE_VIS_DECODE:
// VIS code detection not implemented yet
// Skip directly to separator wait
state = STATE_SEPARATOR;
sample_count = 0;
break;
case STATE_SEPARATOR:
// Wait for separator/porch tone to finish before resuming pixels
sample_count++;
if (separator_target == 0 || sample_count >= separator_target) {
sample_count = 0;
state = STATE_IMAGE_DATA;
}
break;
case STATE_IMAGE_DATA:
// Process pixels continuously
process_pixel_sample(current_freq);
break;
}
}
}
// Estimate frequency from audio samples using Goertzel algorithm
void SSTVRXProcessor::estimate_frequency_goertzel(int32_t audio_sample) {
// Normalize sample to float [-1.0, 1.0]
float sample = audio_sample / 32768.0f;
// Update Goertzel filters for each target frequency
for (int f = 0; f < 4; f++) {
float Q0 = goertzel_coeff[f] * goertzel_Q1[f] - goertzel_Q2[f] + sample;
goertzel_Q2[f] = goertzel_Q1[f];
goertzel_Q1[f] = Q0;
}
goertzel_count++;
// Calculate magnitudes every N samples
if (goertzel_count >= GOERTZEL_N) {
float magnitudes[4];
for (int f = 0; f < 4; f++) {
// Calculate magnitude^2 (we don't need sqrt for comparison)
magnitudes[f] = goertzel_Q1[f] * goertzel_Q1[f] +
goertzel_Q2[f] * goertzel_Q2[f] -
goertzel_Q1[f] * goertzel_Q2[f] * goertzel_coeff[f];
// Reset for next block
goertzel_Q1[f] = 0;
goertzel_Q2[f] = 0;
}
// Find which frequency has the strongest response
int max_idx = 0;
float max_mag = magnitudes[0];
for (int f = 1; f < 4; f++) {
if (magnitudes[f] > max_mag) {
max_mag = magnitudes[f];
max_idx = f;
}
}
// Map index to frequency
// 0=1200Hz, 1=1500Hz, 2=1900Hz, 3=2300Hz
const int freqs[4] = {1200, 1500, 1900, 2300};
// Check if we have a strong enough signal
// Lowered threshold for weak signals (SSTV often has low audio levels)
if (max_mag > 0.001f) { // Very low threshold - accept weak signals
int freq_est = freqs[max_idx];
// Improved linear interpolation between bins
if (max_idx > 0 && magnitudes[max_idx - 1] > 0.0005f) {
float ratio = magnitudes[max_idx - 1] / max_mag;
if (ratio > 0.2f) {
freq_est -= (int)((freqs[max_idx] - freqs[max_idx - 1]) * ratio * 0.5f);
}
}
if (max_idx < 3 && magnitudes[max_idx + 1] > 0.0005f) {
float ratio = magnitudes[max_idx + 1] / max_mag;
if (ratio > 0.2f) {
freq_est += (int)((freqs[max_idx + 1] - freqs[max_idx]) * ratio * 0.5f);
}
}
// Light smoothing to reduce noise while maintaining responsiveness
current_freq = (current_freq + freq_est) / 2;
} else {
// Signal too weak - don't update frequency (keeps last valid estimate)
// This prevents spurious detections from noise
}
goertzel_count = 0;
}
}
// Convert frequency to pixel value (0-255)
int32_t SSTVRXProcessor::freq_to_pixel(int32_t freq) {
// SSTV standard: 1500 Hz = black (0), 2300 Hz = white (255)
if (freq < FREQ_BLACK) freq = FREQ_BLACK;
if (freq > FREQ_WHITE) freq = FREQ_WHITE;
// Linear mapping
int32_t pixel = ((freq - FREQ_BLACK) * 255) / (FREQ_WHITE - FREQ_BLACK);
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
return pixel;
}
// Detect horizontal sync pulses
void SSTVRXProcessor::detect_sync(int32_t freq) {
// Sync pulse is 1200 Hz for ~9ms
const int32_t sync_tolerance = 150; // Hz - tolerance for sync detection
// Check for sync frequency (1200 Hz ± 150 Hz)
if (freq > (FREQ_SYNC - sync_tolerance) && freq < (FREQ_SYNC + sync_tolerance)) {
sync_sample_count++;
in_sync = true;
} else {
// Not sync frequency - check if we just finished a valid sync
// Require at least 1/3 of expected sync duration (more lenient for weak signals)
if (in_sync && sync_sample_count >= (samples_per_sync / 3)) {
// Valid sync pulse detected - always record it for timing tracking
// Debug: log current history count before recording
SSTVRXProgressMessage pre_count_msg{0xFFF7, sync_history_count};
shared_memory.application_queue.push(pre_count_msg);
if (sync_history_count < MAX_SYNC_HISTORY) {
sync_positions[sync_history_count] = global_sample_count;
sync_history_count++;
// Send debug message with sync count
SSTVRXProgressMessage sync_debug{0xFFFD, sync_history_count};
shared_memory.application_queue.push(sync_debug);
// Check if this sync should be used for calibration (reject outliers)
bool use_for_calibration = true;
if (sync_history_count > 1) {
uint32_t interval = sync_positions[sync_history_count - 1] - sync_positions[sync_history_count - 2];
const uint32_t nominal_interval = compute_nominal_line_interval();
if (nominal_interval == 0) {
use_for_calibration = false;
} else {
const uint32_t tolerance = nominal_interval / 4;
const uint32_t min_interval = (nominal_interval > tolerance) ? (nominal_interval - tolerance) : 0;
const uint32_t max_interval = nominal_interval + tolerance;
if (interval < min_interval || interval > max_interval) {
use_for_calibration = false; // Don't use this sync for calibration
// Debug: Send outlier rejection message (use 0xFFF8 for interval value)
SSTVRXProgressMessage outlier_msg{0xFFF8, (uint16_t)(interval & 0xFFFF)};
shared_memory.application_queue.push(outlier_msg);
}
}
}
// Calculate calibration after collecting enough syncs for accuracy
// Wait for 8 syncs to get better statistics, then update every 8 syncs
if (use_for_calibration && sync_history_count >= 8 && pixel_time_frac != 0.0f && sync_history_count % 8 == 0) {
calculate_calibration();
}
} else {
// Debug: MAX_SYNC_HISTORY exceeded
SSTVRXProgressMessage max_reached_msg{0xFFF6, sync_history_count};
shared_memory.application_queue.push(max_reached_msg);
}
// Debug: Send sync detection info with timing data
// Also send current frequency estimate for debugging
SSTVRXProgressMessage debug_msg{0xFFFE, (uint16_t)sync_sample_count};
shared_memory.application_queue.push(debug_msg);
// Send frequency estimate for debugging (use 0xFFF9)
SSTVRXProgressMessage freq_msg{0xFFF9, (uint16_t)current_freq};
shared_memory.application_queue.push(freq_msg);
bool ready_for_line = false;
if (waiting_for_first_line) {
if (sync_history_count >= 2) {
waiting_for_first_line = false;
ready_for_line = true;
SSTVRXProgressMessage start_msg{0xFFF4, static_cast<uint16_t>(sync_sample_count)};
shared_memory.application_queue.push(start_msg);
}
} else if (state == STATE_SYNC_SEARCH) {
ready_for_line = true;
}
if (ready_for_line) {
begin_line_after_sync();
}
// else: Line 0 without enough syncs, or mid-image but not in SYNC_SEARCH - just track the sync
}
in_sync = false;
sync_sample_count = 0;
}
}
// Calculate phase and slant calibration from sync timing
void SSTVRXProcessor::calculate_calibration() {
if (sync_history_count < 2 || pixel_time_frac == 0.0f) return;
expected_sync_interval = compute_nominal_line_interval();
if (expected_sync_interval == 0) {
return;
}
// Send debug info about expected interval
SSTVRXProgressMessage debug_interval{0xFFFC, (uint16_t)(expected_sync_interval & 0xFFFF)};
shared_memory.application_queue.push(debug_interval);
// Calculate average timing error (slant) from recent intervals
// Use last 8 intervals for more responsive calibration, but filter outliers
int32_t total_timing_error = 0;
uint32_t last_interval = 0;
uint16_t start_idx = (sync_history_count > 8) ? (sync_history_count - 8) : 1;
uint16_t interval_count = 0;
for (uint16_t i = start_idx; i < sync_history_count; i++) {
uint32_t actual_interval = sync_positions[i] - sync_positions[i - 1];
last_interval = actual_interval;
// Filter out outliers: reject intervals >20% off expected value
// These are likely missed syncs, not actual timing drift
int32_t timing_error = (int32_t)actual_interval - (int32_t)expected_sync_interval;
int32_t max_deviation = (int32_t)expected_sync_interval / 5; // 20% threshold
// Only include intervals within ±20% of expected
if (timing_error >= -max_deviation && timing_error <= max_deviation) {
total_timing_error += timing_error;
interval_count++;
}
}
// Send debug info about last actual interval
SSTVRXProgressMessage debug_actual{0xFFFB, (uint16_t)(last_interval & 0xFFFF)};
shared_memory.application_queue.push(debug_actual);
if (interval_count == 0) return; // Safety check - no valid intervals
// Average error per line
int32_t avg_error = total_timing_error / interval_count;
// Convert to slant adjustment (0.1% units)
// Error in samples / expected_sync_interval = fractional error
// Multiply by 1000 to get 0.1% units
int16_t suggested_slant = (int16_t)(((int64_t)avg_error * 1000) / expected_sync_interval);
// Clamp to reasonable range (±10% = ±100 in 0.1% units)
if (suggested_slant > 100) suggested_slant = 100;
if (suggested_slant < -100) suggested_slant = -100;
// Phase is harder to detect automatically without knowing absolute position
// For now, we only suggest slant correction
int16_t suggested_phase = 0;
// Send calibration suggestion
SSTVRXCalibrationMessage cal_msg{suggested_phase, suggested_slant, sync_history_count};
shared_memory.application_queue.push(cal_msg);
}
uint32_t SSTVRXProcessor::compute_nominal_line_interval() const {
const uint32_t channel_sections = (channel_count > 0) ? channel_count : 1U;
const uint32_t gap_sections = (samples_per_gap == 0)
? 0U
: ((active_mode && active_mode->gaps) ? channel_sections : 1U);
const float samples_per_channel_f = pixel_time_frac * static_cast<float>(PIXELS_PER_LINE);
const float rounded_channel = std::round(samples_per_channel_f);
const uint32_t samples_per_channel = static_cast<uint32_t>(std::max(1.0f, rounded_channel));
const uint32_t total_channel_samples = samples_per_channel * channel_sections;
const uint32_t total_gap_samples = samples_per_gap * gap_sections;
return samples_per_sync + total_gap_samples + total_channel_samples;
}
// Process pixel samples during image data state
void SSTVRXProcessor::process_pixel_sample(int32_t freq) {
// Accumulate frequency samples for averaging
pixel_accumulator += freq;
pixel_sample_count++;
// Advance pixel phase (1.0 per sample, adjusted by slant)
pixel_phase += slant_factor;
// Check if we've accumulated enough samples for one or more pixels
// pixel_time_frac is the number of audio samples per pixel for the current mode
// Use a loop to handle cases where pixel_phase exceeds pixel_time_frac by more than one pixel
while (pixel_phase >= pixel_time_frac && pixel_index < PIXELS_PER_LINE) {
// Pixel complete - calculate average frequency
// Prevent division by zero
int32_t avg_freq;
if (pixel_sample_count > 0) {
avg_freq = pixel_accumulator / pixel_sample_count;
} else {
avg_freq = freq; // Use current frequency if no samples accumulated
}
// Convert to pixel value
uint8_t pixel_value = freq_to_pixel(avg_freq);
// Apply phase offset (horizontal shift) and clamp to prevent out-of-bounds writes
// Clamping prevents pixels from wrapping around and causing duplication
int32_t adjusted_pixel_index = (int32_t)pixel_index + phase_offset;
if (adjusted_pixel_index < 0) {
adjusted_pixel_index = 0;
} else if (adjusted_pixel_index >= PIXELS_PER_LINE) {
adjusted_pixel_index = PIXELS_PER_LINE - 1;
}
store_pixel_value(channel_index, static_cast<uint16_t>(adjusted_pixel_index), pixel_value);
pixel_index++;
// Reset accumulator for next pixel
// If this is not the last pixel in the loop, subsequent pixels will use current sample
pixel_accumulator = freq;
pixel_sample_count = 1;
pixel_phase -= pixel_time_frac; // Keep fractional part for next pixel
// Check if we finished a color channel
if (pixel_index >= PIXELS_PER_LINE) {
pixel_index = 0;
const bool last_channel = ((channel_index + 1) >= channel_count);
if (last_channel) {
process_line();
channel_index = 0;
state = STATE_SYNC_SEARCH;
sync_sample_count = 0;
in_sync = false;
reset_pixel_state();
break;
} else {
channel_index++;
reset_pixel_state();
if (channel_gap_samples > 0) {
start_gap(channel_gap_samples);
} else {
state = STATE_IMAGE_DATA;
}
break;
}
}
}
}
void SSTVRXProcessor::process_line() {
if (current_line >= mode_total_lines) current_line = 1; // reset, maybe a new image
if (mode_total_lines == 0) return; // not set
const uint16_t first_chunk_pixels = (PIXELS_PER_LINE < sstv_max_chunk_pixels) ? PIXELS_PER_LINE : sstv_max_chunk_pixels;
const uint16_t remaining_pixels = (PIXELS_PER_LINE > sstv_max_chunk_pixels) ? (PIXELS_PER_LINE - sstv_max_chunk_pixels) : 0;
auto write_chunk = [&](const uint16_t encoded_line, const uint16_t start_pixel, const uint16_t pixel_count) {
if (pixel_count == 0) {
return;
}
wait_for_chunk_slot();
uint8_t* data_ptr = shared_memory.bb_data.data;
data_ptr[0] = encoded_line & 0xFF;
data_ptr[1] = (encoded_line >> 8) & 0xFF;
for (uint16_t i = 0; i < pixel_count; i++) {
const uint16_t src_idx = start_pixel + i;
const size_t dst = sstv_chunk_header_bytes + i * 3;
data_ptr[dst + 0] = line_buffer_r[src_idx];
data_ptr[dst + 1] = line_buffer_g[src_idx];
data_ptr[dst + 2] = line_buffer_b[src_idx];
}
mark_chunk_ready();
SSTVRXProgressMessage progress_message{encoded_line, mode_total_lines};
shared_memory.application_queue.push(progress_message);
};
write_chunk(static_cast<uint16_t>(current_line * 2), 0, first_chunk_pixels);
if (remaining_pixels) {
write_chunk(static_cast<uint16_t>(current_line * 2 + 1), first_chunk_pixels, remaining_pixels);
}
current_line++;
}
void SSTVRXProcessor::on_message(const Message* const msg) {
switch (msg->id) {
case Message::ID::CaptureConfig:
capture_config(*reinterpret_cast<const CaptureConfigMessage*>(msg));
break;
case Message::ID::SSTVRXPhaseSlant: {
const auto message = *reinterpret_cast<const SSTVRXPhaseSlantMessage*>(msg);
phase_offset = message.phase;
slant_rate = message.slant;
// Convert slant from 0.1% units to a multiplier
// slant_rate of +10 = +1% faster = multiply by 1.01
slant_factor = 1.0f + (slant_rate / 1000.0f);
break;
}
case Message::ID::SSTVRXConfigure: {
const auto message = *reinterpret_cast<const SSTVRXConfigureMessage*>(msg);
vis_code = message.code;
active_mode = find_mode_by_vis_code(message.code);
if (!active_mode) {
configured = false;
SSTVRXProgressMessage error_msg{0xFFFF, 0};
shared_memory.application_queue.push(error_msg);
break;
}
if (active_mode->pixels != PIXELS_PER_LINE) {
configured = false;
SSTVRXProgressMessage error_msg{0xFFFF, 0};
shared_memory.application_queue.push(error_msg);
break;
}
mode_total_lines = active_mode->lines;
if (mode_total_lines == 0) {
mode_total_lines = 1;
}
channel_count = static_cast<uint8_t>(active_mode->color ? 3U : 1U);
if (channel_count == 0) {
channel_count = 1;
}
color_order = color_order_for_mode(*active_mode);
waiting_for_first_line = true;
// Configure decimation chain using NFM filters (narrower than WFMAM)
decim_0.configure(taps_11k0_decim_0.taps); // NFM decim0 filter
decim_1.configure(taps_11k0_decim_1.taps); // NFM decim1 filter
channel_filter.configure(taps_11k0_channel.taps, 1); // Keep 48kHz audio for better pixel resolution
// Calculate filter parameters
const size_t decim_0_input_fs = baseband_fs;
const size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
const size_t decim_1_input_fs = decim_0_output_fs;
const size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
const size_t channel_filter_output_fs = decim_1_output_fs; // Final rate: 48kHz
// Configure demodulator for SSTV - use moderate NFM deviation
// SSTV needs wider deviation than voice NFM to capture 1200-2300 Hz tone range
demod.configure(channel_filter_output_fs, 7500); // 7.5kHz deviation (wider for SSTV tones)
// No audio filter needed - we want clean SSTV tones without filtering
// Enable audio output for monitoring with passthrough filters
audio_output.configure(iir_config_passthrough, iir_config_passthrough, 0.0f);
// Initialize Goertzel coefficients for 24kHz sample rate
// coeff = 2 * cos(2 * PI * freq / sample_rate)
const float sample_rate = static_cast<float>(channel_filter_output_fs);
const float target_freqs[4] = {1200.0f, 1500.0f, 1900.0f, 2300.0f};
for (int f = 0; f < 4; f++) {
float k = (GOERTZEL_N * target_freqs[f]) / sample_rate;
float omega = (2.0f * M_PI * k) / GOERTZEL_N;
goertzel_coeff[f] = 2.0f * cosf(omega);
goertzel_Q1[f] = 0;
goertzel_Q2[f] = 0;
}
goertzel_count = 0;
// Initialize state variables
current_freq = 1200; // Default to sync frequency
configured = true;
current_line = 0;
sample_count = 0;
pixel_index = 0;
channel_index = 0;
pixel_accumulator = 0;
pixel_sample_count = 0;
sync_sample_count = 0;
in_sync = false;
state = STATE_SYNC_SEARCH;
separator_target = 0;
clear_line_buffers();
// Reset frequency offset calibration
freq_offset = 0;
freq_offset_calibrated = false;
sync_freq_accumulator = 0;
sync_freq_count = 0;
// Reset sync history for calibration
sync_history_count = 0;
memset(sync_positions, 0, sizeof(sync_positions));
// Translate SSTV timing constants (expressed for 3.072MHz TX) to 48kHz RX domain
const float conversion = sample_rate / static_cast<float>(SSTV_SAMPLERATE);
pixel_time_frac = static_cast<float>(active_mode->samples_per_pixel) * conversion;
if (pixel_time_frac < 1.0f) {
pixel_time_frac = 1.0f;
}
samples_per_pixel = static_cast<uint32_t>(pixel_time_frac + 0.5f);
const auto convert_interval = [conversion](uint32_t value) -> uint32_t {
const float samples = static_cast<float>(value) * conversion;
const float rounded = std::round(samples);
const float clamped = std::max(1.0f, rounded);
return static_cast<uint32_t>(clamped);
};
samples_per_sync = convert_interval(active_mode->samples_per_sync);
samples_per_gap = convert_interval(active_mode->samples_per_gap);
channel_gap_samples = active_mode->gaps ? samples_per_gap : 0;
pixel_phase = 0.0f;
reset_pixel_state();
shared_memory.bb_data.data[sstv_chunk_flag_index] = 0;
break;
}
default:
break;
}
}
void SSTVRXProcessor::reset_pixel_state() {
pixel_accumulator = 0;
pixel_sample_count = 0;
pixel_phase = 0.0f;
}
void SSTVRXProcessor::start_gap(const uint32_t duration) {
reset_pixel_state();
separator_target = duration;
sample_count = 0;
if (duration == 0) {
state = STATE_IMAGE_DATA;
} else {
state = STATE_SEPARATOR;
}
}
void SSTVRXProcessor::clear_line_buffers() {
std::fill_n(line_buffer_r, PIXELS_PER_LINE, uint8_t{0});
std::fill_n(line_buffer_g, PIXELS_PER_LINE, uint8_t{0});
std::fill_n(line_buffer_b, PIXELS_PER_LINE, uint8_t{0});
}
void SSTVRXProcessor::begin_line_after_sync() {
pixel_index = 0;
channel_index = 0;
clear_line_buffers();
start_gap(samples_per_gap);
}
void SSTVRXProcessor::store_pixel_value(const uint32_t channel, const uint16_t pixel, const uint8_t value) {
if (!active_mode) {
return;
}
if (!active_mode->color) {
line_buffer_r[pixel] = value;
line_buffer_g[pixel] = value;
line_buffer_b[pixel] = value;
return;
}
if (channel >= channel_count || channel >= color_order.size()) {
return;
}
switch (color_order[channel]) {
case 0:
line_buffer_r[pixel] = value;
break;
case 1:
line_buffer_g[pixel] = value;
break;
case 2:
line_buffer_b[pixel] = value;
break;
default:
break;
}
}
void SSTVRXProcessor::capture_config(const CaptureConfigMessage& message) {
if (message.config) {
audio_output.set_stream(std::make_unique<StreamInput>(message.config));
} else {
audio_output.set_stream(nullptr);
}
}
int main() {
// Initialize audio DMA
audio::dma::init_audio_out();
EventDispatcher event_dispatcher{std::make_unique<SSTVRXProcessor>()};
event_dispatcher.run();
return 0;
}
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