plc.c File Reference

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "spandsp/telephony.h"
#include "spandsp/dc_restore.h"
#include "spandsp/plc.h"

Defines

#define ATTENUATION_INCREMENT   0.0025f
#define ms_to_samples(t)   (((t)*SAMPLE_RATE)/1000)

Functions

int plc_rx (plc_state_t *s, int16_t amp[], int len)
 Process a block of received audio samples for PLC.
int plc_fillin (plc_state_t *s, int16_t amp[], int len)
 Fill-in a block of missing audio samples.
plc_state_tplc_init (plc_state_t *s)
 Initialise a PLC context.
int plc_release (plc_state_t *s)

Detailed Description


Function Documentation

int plc_fillin ( plc_state_t s,
int16_t  amp[],
int  len 
)

Fill-in a block of missing audio samples.

Fill-in a block of missing audio samples.

Parameters:
s The packet loss concealer context.
amp The audio sample buffer.
len The number of samples to be synthesised.
Returns:
The number of samples synthesized.

plc_state_t* plc_init ( plc_state_t s  ) 

Initialise a PLC context.

Initialise a packet loss concealer context.

Parameters:
s The packet loss concealer context.
Returns:
A pointer to the the packet loss concealer context.

int plc_release ( plc_state_t s  ) 

Free a packet loss concealer context.

Parameters:
s The packet loss concealer context.
Returns:
0 for OK.

int plc_rx ( plc_state_t s,
int16_t  amp[],
int  len 
)

Process a block of received audio samples for PLC.

Process a block of received audio samples for PLC.

Parameters:
s The packet loss concealer context.
amp The audio sample buffer.
len The number of samples in the buffer.
Returns:
The number of samples in the buffer.


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