feat: integrate RTL-TCP server support

2025-11-01 22:39:52 +08:00
parent 356738ac10
commit 5aa19ada14
379 changed files with 109413 additions and 47 deletions
--- a/android/app/src/main/cpp/dsp/ctcssdetector.cpp
+++ b/android/app/src/main/cpp/dsp/ctcssdetector.cpp
@@ -0,0 +1,159 @@
+//////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2015-2017, 2020 Edouard Griffiths, F4EXB <f4exb06@gmail.com>                               //
+// Copyright (C) 2020 Kacper Michajłow <kasper93@gmail.com>                                                 //
+//                                                                                                          //
+// See: http://www.embedded.com/design/connectivity/4025660/Detecting-CTCSS-tones-with-Goertzel-s-algorithm //
+//                                                                                                          //
+// 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 as version 3 of the License, 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 V3 for more details.                                                          //
+//                                                                                                          //
+// You should have received a copy of the GNU General Public License                                        //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.                                     //
+//////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#include <cmath>
+
+#include "dsp/ctcssdetector.h"
+
+CTCSSDetector::CTCSSDetector() :
+			m_N(0),
+			m_sampleRate(0),
+			m_samplesProcessed(0),
+			m_maxPowerIndex(0),
+			m_toneDetected(false),
+			m_maxPower(0.0)
+{
+	m_k = new Real[CTCSSFrequencies::m_nbFreqs];
+	m_coef = new Real[CTCSSFrequencies::m_nbFreqs];
+	m_u0 = new Real[CTCSSFrequencies::m_nbFreqs];
+	m_u1 = new Real[CTCSSFrequencies::m_nbFreqs];
+	m_power = new Real[CTCSSFrequencies::m_nbFreqs];
+}
+
+CTCSSDetector::~CTCSSDetector()
+{
+	delete[] m_k;
+	delete[] m_coef;
+	delete[] m_u0;
+	delete[] m_u1;
+	delete[] m_power;
+}
+
+
+void CTCSSDetector::setCoefficients(int N, int sampleRate)
+{
+	m_N = N;                   // save the basic parameters for use during analysis
+	m_sampleRate = sampleRate;
+
+	// for each of the frequencies (tones) of interest calculate
+	// k and the associated filter coefficient as per the Goertzel
+	// algorithm. Note: we are using a real value (as apposed to
+	// an integer as described in some references. k is retained
+	// for later display. The tone set is specified in the
+	// constructor. Notice that the resulting coefficients are
+	// independent of N.
+	for (int j = 0; j < CTCSSFrequencies::m_nbFreqs; ++j)
+	{
+		m_k[j] = ((double) m_N * CTCSSFrequencies::m_Freqs[j]) / (double)m_sampleRate;
+		m_coef[j] = 2.0 * cos((2.0 * M_PI * CTCSSFrequencies::m_Freqs[j])/(double)m_sampleRate);
+	}
+}
+
+
+// Analyze an input signal for the presence of CTCSS tones.
+bool CTCSSDetector::analyze(Real *sample)
+{
+
+	feedback(*sample); // Goertzel feedback
+	m_samplesProcessed += 1;
+
+	if (m_samplesProcessed == m_N) // completed a block of N
+	{
+		feedForward(); // calculate the m_power at each tone
+		m_samplesProcessed = 0;
+		return true; // have a result
+	}
+	else
+	{
+		return false;
+	}
+}
+
+
+void CTCSSDetector::feedback(Real in)
+{
+	Real t;
+
+	// feedback for each tone
+	for (int j = 0; j < CTCSSFrequencies::m_nbFreqs; ++j)
+	{
+		t = m_u0[j];
+		m_u0[j] = in + (m_coef[j] * m_u0[j]) - m_u1[j];
+		m_u1[j] = t;
+	}
+}
+
+
+void CTCSSDetector::feedForward()
+{
+	initializePower();
+
+	for (int j = 0; j < CTCSSFrequencies::m_nbFreqs; ++j)
+	{
+		m_power[j] = (m_u0[j] * m_u0[j]) + (m_u1[j] * m_u1[j]) - (m_coef[j] * m_u0[j] * m_u1[j]);
+		m_u0[j] = m_u1[j] = 0.0; // reset for next block.
+	}
+
+	evaluatePower();
+}
+
+
+void CTCSSDetector::reset()
+{
+	for (int j = 0; j < CTCSSFrequencies::m_nbFreqs; ++j)
+	{
+		m_power[j] = m_u0[j] = m_u1[j] = 0.0; // reset
+	}
+
+	m_samplesProcessed = 0;
+	m_maxPower = 0.0;
+	m_maxPowerIndex = 0;
+	m_toneDetected = false;
+}
+
+
+void CTCSSDetector::initializePower()
+{
+	for (int j = 0; j < CTCSSFrequencies::m_nbFreqs; ++j)
+	{
+		m_power[j] = 0.0; // reset
+	}
+}
+
+
+void CTCSSDetector::evaluatePower()
+{
+	Real sumPower = 0.0;
+	Real aboveAvg = 2.0; // Arbitrary max m_power above average threshold
+	m_maxPower = 0.0;
+
+	for (int j = 0; j < CTCSSFrequencies::m_nbFreqs; ++j)
+	{
+		sumPower += m_power[j];
+
+		if (m_power[j] > m_maxPower)
+		{
+			m_maxPower = m_power[j];
+			m_maxPowerIndex = j;
+		}
+	}
+
+	m_toneDetected = (m_maxPower > (sumPower/CTCSSFrequencies::m_nbFreqs) + aboveAvg);
+}