POCSAG before reformat

This is the POCSAG code before reformat to put smooth and extract packets in the correct place
2026-09-12 09:39:30 +00:00 · 2021-10-10 09:15:42 +01:00
parent 848dba44d8
commit ab364ca497
9 changed files with 908 additions and 97 deletions
@@ -0,0 +1,96 @@
+/*
+ * 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.
+ */
+
+#ifndef __EXTRACT_FRAME_PAGER_H__
+#define __EXTRACT_FRAME_PAGER_H__
+
+#include <bitset> 
+using namespace std;
+
+#define MAX_CODEWORDS (16)
+class extract_frame_pager
+{
+public:
+	struct FIFOStruct {
+		unsigned long	codeword;
+		int				numBits;
+	};
+
+#define BIT_BUF_SIZE (64)
+	enum BitsState { BS_SEARCHING, BS_SYNC, BS_LOCKED };
+	enum DetectionMode { DM_STATIC, DM_DYNAMIC, DM_DIFFERENTIAL };
+
+	extract_frame_pager();
+	virtual ~extract_frame_pager();
+
+
+	void resetVals();
+	void setParams(long a_samplesPerSec, long a_maxBaud = 8000, long a_minBaud = 200, long maxRunOfSameValue = 32);
+
+	int	 processDemodulatedSamples(float * sampleBuff, int noOfSamples);
+	int  extractFrames();
+	virtual int OnDataFrame(int len, int baud) = 0;
+	virtual int OnDataWord(uint32_t word, int pos) = 0;
+
+	void	init();
+	void	storeBit();
+	short	getBit();
+
+	int		getNoOfBits();
+	uint32_t getRate();
+
+protected:
+	uint32_t	m_averageSymbolLen_1024;
+	uint32_t	m_lastStableSymbolLen_1024;
+
+	uint32_t m_samplesPerSec;
+	uint32_t m_goodTransitions;
+	uint32_t m_badTransitions;
+
+private:
+	uint32_t m_sampleNo;
+	float  m_sample;
+	float  m_valMid;
+	float  m_lastSample;
+
+	BitsState	m_state;
+	uint32_t  m_lastTransPos_1024;
+	uint32_t  m_lastSingleBitPos_1024;
+
+	uint32_t m_nextBitPosInt; // Integer rounded up version to save on ops
+	uint32_t m_nextBitPos_1024;
+	uint32_t m_lastBitPos_1024;
+
+	uint32_t m_shortestGoodTrans_1024;
+	uint32_t m_minSymSamples_1024;
+	uint32_t m_maxSymSamples_1024;
+	uint32_t m_maxRunOfSameValue;
+
+	bitset<(size_t)BIT_BUF_SIZE> m_bits;
+	long		m_bitsStart;
+	long		m_bitsEnd;
+	DetectionMode	m_detectionMode;
+
+	FIFOStruct		m_fifo;
+	bool			m_gotSync;
+	int				m_numCode;
+	bool			m_inverted;
+};
+
+#endif/*__EXTRACT_FRAME_PAGER_H__*/