mirror of
https://github.com/AlexandreRouma/SDRPlusPlus.git
synced 2025-01-01 05:47:11 +01:00
283 lines
8.8 KiB
C++
283 lines
8.8 KiB
C++
#pragma once
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#include <dsp/block.h>
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#include <volk/volk.h>
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#include <spdlog/spdlog.h>
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#define FAST_ATAN2_COEF1 FL_M_PI / 4.0f
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#define FAST_ATAN2_COEF2 3.0f * FAST_ATAN2_COEF1
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inline float fast_arctan2(float y, float x) {
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float abs_y = fabsf(y);
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float r, angle;
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if (x == 0.0f && y == 0.0f) { return 0.0f; }
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if (x>=0.0f) {
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r = (x - abs_y) / (x + abs_y);
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angle = FAST_ATAN2_COEF1 - FAST_ATAN2_COEF1 * r;
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}
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else {
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r = (x + abs_y) / (abs_y - x);
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angle = FAST_ATAN2_COEF2 - FAST_ATAN2_COEF1 * r;
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}
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if (y < 0.0f) {
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return -angle;
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}
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return angle;
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}
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namespace dsp {
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class FMDemod : public generic_block<FMDemod> {
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public:
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FMDemod() {}
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FMDemod(stream<complex_t>* in, float sampleRate, float deviation) { init(in, sampleRate, deviation); }
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~FMDemod() { generic_block<FMDemod>::stop(); }
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void init(stream<complex_t>* in, float sampleRate, float deviation) {
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_in = in;
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_sampleRate = sampleRate;
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_deviation = deviation;
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phasorSpeed = (2 * FL_M_PI) / (_sampleRate / _deviation);
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generic_block<FMDemod>::registerInput(_in);
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generic_block<FMDemod>::registerOutput(&out);
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}
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void setInput(stream<complex_t>* in) {
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std::lock_guard<std::mutex> lck(generic_block<FMDemod>::ctrlMtx);
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generic_block<FMDemod>::tempStop();
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generic_block<FMDemod>::unregisterInput(_in);
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_in = in;
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generic_block<FMDemod>::registerInput(_in);
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generic_block<FMDemod>::tempStart();
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}
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void setSampleRate(float sampleRate) {
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std::lock_guard<std::mutex> lck(generic_block<FMDemod>::ctrlMtx);
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generic_block<FMDemod>::tempStop();
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_sampleRate = sampleRate;
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phasorSpeed = (2 * FL_M_PI) / (_sampleRate / _deviation);
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generic_block<FMDemod>::tempStart();
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}
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float getSampleRate() {
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return _sampleRate;
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}
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void setDeviation(float deviation) {
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std::lock_guard<std::mutex> lck(generic_block<FMDemod>::ctrlMtx);
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generic_block<FMDemod>::tempStop();
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_deviation = deviation;
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phasorSpeed = (2 * FL_M_PI) / (_sampleRate / _deviation);
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generic_block<FMDemod>::tempStart();
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}
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float getDeviation() {
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return _deviation;
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}
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int run() {
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count = _in->read();
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if (count < 0) { return -1; }
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// This is somehow faster than volk...
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float diff, currentPhase;
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if (out.aquire() < 0) { return -1; }
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for (int i = 0; i < count; i++) {
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currentPhase = fast_arctan2(_in->data[i].i, _in->data[i].q);
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diff = currentPhase - phase;
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if (diff > 3.1415926535f) { diff -= 2 * 3.1415926535f; }
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else if (diff <= -3.1415926535f) { diff += 2 * 3.1415926535f; }
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out.data[i] = diff / phasorSpeed;
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phase = currentPhase;
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}
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_in->flush();
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out.write(count);
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return count;
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}
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stream<float> out;
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private:
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int count;
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float phase, phasorSpeed, _sampleRate, _deviation;
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stream<complex_t>* _in;
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};
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class AMDemod : public generic_block<AMDemod> {
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public:
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AMDemod() {}
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AMDemod(stream<complex_t>* in) { init(in); }
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~AMDemod() { generic_block<AMDemod>::stop(); }
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void init(stream<complex_t>* in) {
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_in = in;
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generic_block<AMDemod>::registerInput(_in);
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generic_block<AMDemod>::registerOutput(&out);
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}
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void setInput(stream<complex_t>* in) {
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std::lock_guard<std::mutex> lck(generic_block<AMDemod>::ctrlMtx);
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generic_block<AMDemod>::tempStop();
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generic_block<AMDemod>::unregisterInput(_in);
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_in = in;
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generic_block<AMDemod>::registerInput(_in);
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generic_block<AMDemod>::tempStart();
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}
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int run() {
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count = _in->read();
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if (count < 0) { return -1; }
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if (out.aquire() < 0) { return -1; }
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volk_32fc_magnitude_32f(out.data, (lv_32fc_t*)_in->data, count);
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_in->flush();
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volk_32f_accumulator_s32f(&avg, out.data, count);
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avg /= (float)count;
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for (int i = 0; i < count; i++) {
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out.data[i] -= avg;
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}
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out.write(count);
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return count;
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}
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stream<float> out;
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private:
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float avg;
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int count;
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stream<complex_t>* _in;
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};
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class SSBDemod : public generic_block<SSBDemod> {
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public:
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SSBDemod() {}
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SSBDemod(stream<complex_t>* in, float sampleRate, float bandWidth, int mode) { init(in, sampleRate, bandWidth, mode); }
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~SSBDemod() {
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generic_block<SSBDemod>::stop();
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delete[] buffer;
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}
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enum {
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MODE_USB,
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MODE_LSB,
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MODE_DSB
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};
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void init(stream<complex_t>* in, float sampleRate, float bandWidth, int mode) {
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_in = in;
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_sampleRate = sampleRate;
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_bandWidth = bandWidth;
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_mode = mode;
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phase = lv_cmake(1.0f, 0.0f);
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switch (_mode) {
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case MODE_USB:
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phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_LSB:
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phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_DSB:
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phaseDelta = lv_cmake(1.0f, 0.0f);
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break;
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}
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buffer = new lv_32fc_t[STREAM_BUFFER_SIZE];
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generic_block<SSBDemod>::registerInput(_in);
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generic_block<SSBDemod>::registerOutput(&out);
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}
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void setInput(stream<complex_t>* in) {
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std::lock_guard<std::mutex> lck(generic_block<SSBDemod>::ctrlMtx);
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generic_block<SSBDemod>::tempStop();
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generic_block<SSBDemod>::unregisterInput(_in);
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_in = in;
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generic_block<SSBDemod>::registerInput(_in);
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generic_block<SSBDemod>::tempStart();
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}
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void setSampleRate(float sampleRate) {
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// No need to restart
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_sampleRate = sampleRate;
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switch (_mode) {
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case MODE_USB:
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phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_LSB:
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phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_DSB:
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phaseDelta = lv_cmake(1.0f, 0.0f);
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break;
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}
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}
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void setBandWidth(float bandWidth) {
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// No need to restart
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_bandWidth = bandWidth;
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switch (_mode) {
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case MODE_USB:
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phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_LSB:
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phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_DSB:
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phaseDelta = lv_cmake(1.0f, 0.0f);
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break;
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}
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}
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void setMode(int mode) {
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_mode = mode;
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switch (_mode) {
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case MODE_USB:
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phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_LSB:
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phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
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break;
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case MODE_DSB:
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phaseDelta = lv_cmake(1.0f, 0.0f);
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break;
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}
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}
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int run() {
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count = _in->read();
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if (count < 0) { return -1; }
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if (out.aquire() < 0) { return -1; }
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volk_32fc_s32fc_x2_rotator_32fc(buffer, (lv_32fc_t*)_in->data, phaseDelta, &phase, count);
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volk_32fc_deinterleave_real_32f(out.data, buffer, count);
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_in->flush();
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out.write(count);
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return count;
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}
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stream<float> out;
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private:
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int count;
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int _mode;
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float _sampleRate, _bandWidth;
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stream<complex_t>* _in;
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lv_32fc_t* buffer;
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lv_32fc_t phase;
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lv_32fc_t phaseDelta;
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};
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} |