p25p1_ldu.h File Reference

#include "dsd.h"
#include "p25p1_hdu.h"
#include "p25p1_const.h"
#include "p25p1_heuristics.h"

Go to the source code of this file.

Functions
void	process_IMBE (dsd_opts *opts, dsd_state *state, int *status_count)
void	read_and_correct_hex_word (dsd_opts *opts, dsd_state *state, char *hex, int *status_count, AnalogSignal *analog_signal_array, int *analog_signal_index)
void	correct_hamming_dibits (char *hex_data, int hex_count, AnalogSignal *analog_signal_array)

Function Documentation

correct_hamming_dibits()

void correct_hamming_dibits	(	char *	hex_data,
		int	hex_count,
		AnalogSignal *	analog_signal_array )

Correct the information in analog_signal_array according with the content of data, which has been error corrected and should be valid.

Parameters

Dibits	that have already been error corrected and we trust are correct. \count Number of dibits.
analog_signal_array	Pointer to a sequence of AnalogSignal elements, as many as the value of count.

process_IMBE()

void process_IMBE	(	dsd_opts *	opts,
		dsd_state *	state,
		int *	status_count )

Separate imbe frames and deinterleave. This important methods read the IMBE data from the stream and passes it to the vocoder to produce audio.

Parameters

opts	The DSD options.
state	The DSD state. \status_count An index that allows us to skip the status words interleaved every 36 dibit in the data stream.

read_and_correct_hex_word()

void read_and_correct_hex_word	(	dsd_opts *	opts,
		dsd_state *	state,
		char *	hex,
		int *	status_count,
		AnalogSignal *	analog_signal_array,
		int *	analog_signal_index )

Reads an hex word, its parity bits and attempts to error correct it using the Hamming FEC.

Parameters

opts	The DSD options.
state	The DSD state.
hex	Pointer where to store the read hex word. Six bytes, one per bit.
status_count	An index that allows us to skip the status words interleaved every 36 dibit in the data stream.
analog_singal_array	Pointer to a sequence of AnalogSignal elements.
analog_signal_index	The current index in the analog_singal_array. This value is increased on each dibit read.