gsm0610_encode.c File Reference

#include <assert.h>
#include <inttypes.h>
#include "floating_fudge.h"
#include <stdlib.h>
#include <memory.h>
#include "spandsp/telephony.h"
#include "spandsp/bitstream.h"
#include "spandsp/saturated.h"
#include "spandsp/gsm0610.h"
#include "gsm0610_local.h"

Functions
gsm0610_state_t *	gsm0610_init (gsm0610_state_t *s, int packing)
int	gsm0610_set_packing (gsm0610_state_t *s, int packing)
int	gsm0610_release (gsm0610_state_t *s)
int	gsm0610_pack_none (uint8_t c[], const gsm0610_frame_t *s)
int	gsm0610_pack_wav49 (uint8_t c[], const gsm0610_frame_t *s)
int	gsm0610_pack_voip (uint8_t c[33], const gsm0610_frame_t *s)
int	gsm0610_encode (gsm0610_state_t *s, uint8_t code[], const int16_t amp[], int len)

---

Detailed Description

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Function Documentation

int gsm0610_encode	(	gsm0610_state_t *	s,
		uint8_t	code[],
		const int16_t	amp[],
		int	len
	)

Encode a buffer of linear PCM data to GSM 06.10.

Parameters:

	s	The GSM 06.10 context.
	code	The GSM 06.10 data produced.
	amp	The audio sample buffer.
	len	The number of samples in the buffer.

Returns:

The number of bytes of GSM 06.10 data produced.

References gsm0610_pack_wav49(), and gsm0610_state_t::packing.

gsm0610_state_t* gsm0610_init	(	gsm0610_state_t *	s,
		int	packing
	)

Initialise a GSM 06.10 encode or decode context.

Parameters:

	s	The GSM 06.10 context
	packing	One of the GSM0610_PACKING_xxx options.

Returns:

A pointer to the GSM 06.10 context, or NULL for error.

int gsm0610_pack_wav49	(	uint8_t	c[],
		const gsm0610_frame_t *	s
	)

Pack a pair of GSM 06.10 frames in the format used for wave files (wave type 49).

Parameters:

	c	The buffer for the packed data. This must be at least 65 bytes long.
	s	A pointer to the frames to be packed.

Returns:

The number of bytes generated.

References gsm0610_frame_t::bc, gsm0610_frame_t::LARc, gsm0610_frame_t::Mc, gsm0610_frame_t::Nc, gsm0610_frame_t::xmaxc, and gsm0610_frame_t::xMc.

Referenced by gsm0610_encode().

int gsm0610_release

(

gsm0610_state_t *

s

)

Release a GSM 06.10 encode or decode context.

Parameters:

s

The GSM 06.10 context

Returns:

0 for success, else -1.

int gsm0610_set_packing	(	gsm0610_state_t *	s,
		int	packing
	)

Set the packing format for a GSM 06.10 encode or decode context.

Parameters:

	s	The GSM 06.10 context
	packing	One of the GSM0610_PACKING_xxx options.

Returns:

0 for success, else -1.

References gsm0610_state_t::packing.