TCH3 channel coding

Files
file	tch3.h
	Osmocom GMR-1 TCH3 channel coding header.
file	tch3.c
	Osmocom GMR-1 TCH3 channel coding implementation.

Functions
void	gmr1_tch3_encode (ubit_t *bits_e, const uint8_t *frame0, const uint8_t *frame1, const ubit_t *bits_s, const ubit_t *ciph, int m)
	Stateless GMR-1 TCH3 channel coder. More...
void	gmr1_tch3_decode (uint8_t *frame0, uint8_t *frame1, ubit_t *bits_s, const sbit_t *bits_e, const ubit_t *ciph, int m, int *conv0_rv, int *conv1_rv)
	Stateless GMR-1 TCH3 channel decoder. More...

Detailed Description

Function Documentation

gmr1_tch3_decode()

void gmr1_tch3_decode	(	uint8_t *	frame0,
		uint8_t *	frame1,
		ubit_t *	bits_s,
		const sbit_t *	bits_e,
		const ubit_t *	ciph,
		int	m,
		int *	conv0_rv,
		int *	conv1_rv
	)

Stateless GMR-1 TCH3 channel decoder.

Parameters

[out]	frame0	1st speech frame (10 byte / 80 bits, msb first)
[out]	frame1	2nd speech frame (10 byte / 80 bits, msb first)
[out]	bits_s	4 status bits that were demultiplexed
[in]	bits_e	212 softbits demodulated from a burst
[in]	ciph	208 bits of cipher stream (can be NULL)
[in]	m	Multiplexing mode (0 or 1)
[out]	conv0_rv	Return of the conv. decode of frame 0 (can be NULL)
[out]	conv1_rv	Return of the conv. decode of frame 1 (can be NULL)

Returns

0 if CRC check pass, any other value for fail.

References gmr1_scramble_sbit().

gmr1_tch3_encode()

void gmr1_tch3_encode	(	ubit_t *	bits_e,
		const uint8_t *	frame0,
		const uint8_t *	frame1,
		const ubit_t *	bits_s,
		const ubit_t *	ciph,
		int	m
	)

Stateless GMR-1 TCH3 channel coder.

Parameters

[out]	bits_e	212 encoded bits to be mapped on a burst
[in]	frame0	1st speech frame (10 byte / 80 bits, msb first)
[in]	frame1	2nd speech frame (10 byte / 80 bits, msb first)
[in]	bits_s	4 status bits to be multiplexed
[in]	ciph	208 bits of cipher stream (can be NULL)
[in]	m	Multiplexing mode (0 or 1)