ecu_fr_old.c File Reference

#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/codec/gsm610_bits.h>
#include <osmocom/codec/codec.h>
#include <osmocom/codec/ecu.h>

Macros
#define	GSM610_XMAXC_REDUCE   4
#define	GSM610_XMAXC_LEN   6

Functions
static bool	reduce_xmaxcr (struct bitvec *frame_bitvec, const unsigned int index)
	Reduce the XMAXC field. More...
static bool	reduce_xmaxcr_all (struct bitvec *frame_bitvec)
	Reduce all XMAXC fields in the frame. More...
static int	conceal_frame (uint8_t *frame)
void	osmo_ecu_fr_reset (struct osmo_ecu_fr_state *state, const uint8_t *frame)
	To be called when a good frame is received. More...
int	osmo_ecu_fr_conceal (struct osmo_ecu_fr_state *state, uint8_t *frame)
	To be called when a bad frame is received. More...

Macro Definition Documentation

GSM610_XMAXC_LEN

#define GSM610_XMAXC_LEN   6

GSM610_XMAXC_REDUCE

#define GSM610_XMAXC_REDUCE   4

Function Documentation

conceal_frame()

static int conceal_frame ( uint8_t *  frame )

static

References bitvec_alloc(), bitvec_free(), bitvec_pack(), bitvec_unpack(), GSM_FR_BYTES, len(), osmo_fr_check_sid(), and reduce_xmaxcr_all().

Referenced by osmo_ecu_fr_conceal().

osmo_ecu_fr_conceal()

int osmo_ecu_fr_conceal	(	struct osmo_ecu_fr_state *	state,
		uint8_t *	frame
	)

To be called when a bad frame is received.

This function will then generate a replacement frame that can be used to conceal the dropout.

Parameters

[in]	state	The state object for the ECU
[out]	frame	The buffer to fill with GSM_FR_BYTES of replacement frame

Returns

0 if the frame was successfully filled

References conceal_frame(), osmo_ecu_fr_state::frame_backup, GSM_FR_BYTES, and osmo_ecu_fr_state::subsequent_lost_frame.

osmo_ecu_fr_reset()

void osmo_ecu_fr_reset	(	struct osmo_ecu_fr_state *	state,
		const uint8_t *	frame
	)

To be called when a good frame is received.

This function will then create a backup of the frame and reset the internal state.

Parameters

[in]	state	The state object for the ECU
[out]	frame	The valid frame (GSM_FR_BYTES bytes in RTP payload format)

References osmo_ecu_fr_state::frame_backup, GSM_FR_BYTES, and osmo_ecu_fr_state::subsequent_lost_frame.

reduce_xmaxcr()

static bool reduce_xmaxcr ( struct bitvec *  frame_bitvec, const unsigned int  index  )

static

Reduce the XMAXC field.

When the XMAXC field reaches zero the function will return true.

References bitvec_read_field(), bitvec_write_field(), GSM610_XMAXC_LEN, and GSM610_XMAXC_REDUCE.

Referenced by reduce_xmaxcr_all().

reduce_xmaxcr_all()

static bool reduce_xmaxcr_all ( struct bitvec *  frame_bitvec )

static

Reduce all XMAXC fields in the frame.

When all XMAXC fields reach zero, then the function will return true.

References GSM610_RTP_XMAXC00, GSM610_RTP_XMAXC10, GSM610_RTP_XMAXC20, GSM610_RTP_XMAXC30, and reduce_xmaxcr().

Referenced by conceal_frame().