#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "ilbcdata.h"

Data Structures
struct	ILBCFrame

struct	ILBCContext

Macros
#define	LPC_N_20MS 1

#define	LPC_N_30MS 2

#define	LPC_N_MAX 2

#define	LSF_NSPLIT 3

#define	NASUB_MAX 4

#define	LPC_FILTERORDER 10

#define	NSUB_MAX 6

#define	SUBL 40

#define	ST_MEM_L_TBL 85

#define	MEM_LF_TBL 147

#define	STATE_SHORT_LEN_20MS 57

#define	STATE_SHORT_LEN_30MS 58

#define	BLOCKL_MAX 240

#define	CB_MEML 147

#define	CB_NSTAGES 3

#define	CB_HALFFILTERLEN 4

#define	CB_FILTERLEN 8

#define	ENH_NBLOCKS_TOT 8

#define	ENH_BLOCKL 80

#define	ENH_BUFL (ENH_NBLOCKS_TOT)*ENH_BLOCKL

#define	ENH_BUFL_FILTEROVERHEAD 3

#define	BLOCKL_MAX 240

#define	NSUB_20MS 4

#define	NSUB_30MS 6

#define	NSUB_MAX 6

#define	NASUB_20MS 2

#define	NASUB_30MS 4

#define	NASUB_MAX 4

#define	STATE_LEN 80

#define	STATE_SHORT_LEN_30MS 58

#define	STATE_SHORT_LEN_20MS 57

#define	SPL_MUL_16_16(a, b) ((int32_t) (((int16_t)(a)) * ((int16_t)(b))))

#define	SPL_MUL_16_16_RSFT(a, b, c) (SPL_MUL_16_16(a, b) >> (c))

#define	SPL_SHIFT_W32(x, c) (((c) >= 0) ? ((x) << (c)) : ((x) >> (-(c))))

Functions
static int	unpack_frame (ILBCContext *s)

static void	index_conv (int16_t *index)

static void	lsf_dequantization (int16_t lsfdeq, int16_t index, int16_t lpc_n)

static void	lsf_check_stability (int16_t *lsf, int dim, int nb_vectors)

static void	lsf_interpolate (int16_t out, int16_t in1, int16_t *in2, int16_t coef, int size)

static void	lsf2lsp (int16_t lsf, int16_t lsp, int order)

static void	get_lsp_poly (int16_t lsp, int32_t f)

static void	lsf2poly (int16_t a, int16_t lsf)

static void	lsp_interpolate2polydec (int16_t a, int16_t lsf1, int16_t *lsf2, int coef, int length)

static void	bw_expand (int16_t out, const int16_t in, const int16_t *coef, int length)

static void	lsp_interpolate (int16_t syntdenum, int16_t weightdenum, int16_t lsfdeq, int16_t length, ILBCContext s)

static void	filter_mafq12 (int16_t in_ptr, int16_t out_ptr, int16_t *B, int16_t B_length, int16_t length)

static void	filter_arfq12 (const int16_t data_in, int16_t data_out, const int16_t *coefficients, int coefficients_length, int data_length)

static void	state_construct (int16_t ifm, int16_t idx, int16_t synt_denum, int16_t *Out_fix, int16_t len)

static int16_t	gain_dequantization (int index, int max_in, int stage)

static void	vector_rmultiplication (int16_t out, const int16_t in, const int16_t *win, int length, int shift)

static void	vector_multiplication (int16_t out, const int16_t in, const int16_t *win, int length, int shift)

static void	add_vector_and_shift (int16_t out, const int16_t in1, const int16_t *in2, int length, int shift)

static void	create_augmented_vector (int index, int16_t buffer, int16_t cbVec)

static void	get_codebook (int16_t cbvec, int16_t mem, int16_t index, int16_t lMem, int16_t cbveclen)

static void	construct_vector (int16_t decvector, int16_t index, int16_t gain_index, int16_t mem, int16_t lMem, int16_t veclen)

static void	reverse_memcpy (int16_t dest, int16_t source, int length)

static void	decode_residual (ILBCContext s, ILBCFrame encbits, int16_t decresidual, int16_t syntdenum)

static int16_t	max_abs_value_w16 (const int16_t *vector, int length)

static int16_t	get_size_in_bits (uint32_t n)

static int32_t	scale_dot_product (const int16_t v1, const int16_t v2, int length, int scaling)

static void	correlation (int32_t corr, int32_t ener, int16_t *buffer, int16_t lag, int16_t blen, int16_t srange, int16_t scale)

static int16_t	norm_w32 (int32_t a)

static int32_t	div_w32_w16 (int32_t num, int16_t den)

static void	do_plc (int16_t plc_residual, int16_t plc_lpc, int16_t PLI, int16_t decresidual, int16_t lpc, int16_t inlag, ILBCContext *s)

static int	xcorr_coeff (int16_t target, int16_t regressor, int16_t subl, int16_t searchLen, int16_t offset, int16_t step)

static void	hp_output (int16_t signal, const int16_t ba, int16_t y, int16_t x, int16_t len)

static int	ilbc_decode_frame (AVCodecContext avctx, void data, int got_frame_ptr, AVPacket avpkt)

static av_cold int	ilbc_decode_init (AVCodecContext *avctx)

Variables
AVCodec	ff_ilbc_decoder

Macro Definition Documentation

◆ LPC_N_20MS

#define LPC_N_20MS 1

Definition at line 38 of file ilbcdec.c.

◆ LPC_N_30MS

#define LPC_N_30MS 2

Definition at line 39 of file ilbcdec.c.

◆ LPC_N_MAX

#define LPC_N_MAX 2

Definition at line 40 of file ilbcdec.c.

◆ LSF_NSPLIT

#define LSF_NSPLIT 3

Definition at line 41 of file ilbcdec.c.

◆ NASUB_MAX [1/2]

#define NASUB_MAX 4

Definition at line 68 of file ilbcdec.c.

◆ LPC_FILTERORDER

#define LPC_FILTERORDER 10

Definition at line 43 of file ilbcdec.c.

◆ NSUB_MAX [1/2]

#define NSUB_MAX 6

Definition at line 65 of file ilbcdec.c.

◆ SUBL

#define SUBL 40

Definition at line 45 of file ilbcdec.c.

◆ ST_MEM_L_TBL

#define ST_MEM_L_TBL 85

Definition at line 47 of file ilbcdec.c.

◆ MEM_LF_TBL

#define MEM_LF_TBL 147

Definition at line 48 of file ilbcdec.c.

◆ STATE_SHORT_LEN_20MS [1/2]

#define STATE_SHORT_LEN_20MS 57

Definition at line 71 of file ilbcdec.c.

◆ STATE_SHORT_LEN_30MS [1/2]

#define STATE_SHORT_LEN_30MS 58

Definition at line 70 of file ilbcdec.c.

◆ BLOCKL_MAX [1/2]

#define BLOCKL_MAX 240

Definition at line 62 of file ilbcdec.c.

◆ CB_MEML

#define CB_MEML 147

Definition at line 53 of file ilbcdec.c.

◆ CB_NSTAGES

#define CB_NSTAGES 3

Definition at line 54 of file ilbcdec.c.

◆ CB_HALFFILTERLEN

#define CB_HALFFILTERLEN 4

Definition at line 55 of file ilbcdec.c.

◆ CB_FILTERLEN

#define CB_FILTERLEN 8

Definition at line 56 of file ilbcdec.c.

◆ ENH_NBLOCKS_TOT

#define ENH_NBLOCKS_TOT 8

Definition at line 58 of file ilbcdec.c.

◆ ENH_BLOCKL

#define ENH_BLOCKL 80

Definition at line 59 of file ilbcdec.c.

◆ ENH_BUFL

#define ENH_BUFL (ENH_NBLOCKS_TOT)*ENH_BLOCKL

Definition at line 60 of file ilbcdec.c.

◆ ENH_BUFL_FILTEROVERHEAD

#define ENH_BUFL_FILTEROVERHEAD 3

Definition at line 61 of file ilbcdec.c.

◆ BLOCKL_MAX [2/2]

#define BLOCKL_MAX 240

Definition at line 62 of file ilbcdec.c.

◆ NSUB_20MS

#define NSUB_20MS 4

Definition at line 63 of file ilbcdec.c.

◆ NSUB_30MS

#define NSUB_30MS 6

Definition at line 64 of file ilbcdec.c.

◆ NSUB_MAX [2/2]

#define NSUB_MAX 6

Definition at line 65 of file ilbcdec.c.

◆ NASUB_20MS

#define NASUB_20MS 2

Definition at line 66 of file ilbcdec.c.

◆ NASUB_30MS

#define NASUB_30MS 4

Definition at line 67 of file ilbcdec.c.

◆ NASUB_MAX [2/2]

#define NASUB_MAX 4

Definition at line 68 of file ilbcdec.c.

◆ STATE_LEN

#define STATE_LEN 80

Definition at line 69 of file ilbcdec.c.

◆ STATE_SHORT_LEN_30MS [2/2]

#define STATE_SHORT_LEN_30MS 58

Definition at line 70 of file ilbcdec.c.

◆ STATE_SHORT_LEN_20MS [2/2]

#define STATE_SHORT_LEN_20MS 57

Definition at line 71 of file ilbcdec.c.

◆ SPL_MUL_16_16

#define SPL_MUL_16_16	(	a,
		b
	)	((int32_t) (((int16_t)(a)) * ((int16_t)(b))))

Definition at line 73 of file ilbcdec.c.

◆ SPL_MUL_16_16_RSFT

#define SPL_MUL_16_16_RSFT	(	a,
		b,
		c
	)	(SPL_MUL_16_16(a, b) >> (c))

Definition at line 74 of file ilbcdec.c.

◆ SPL_SHIFT_W32

#define SPL_SHIFT_W32	(	x,
		c
	)	(((c) >= 0) ? ((x) << (c)) : ((x) >> (-(c))))

Definition at line 928 of file ilbcdec.c.

Function Documentation

◆ unpack_frame()

static int unpack_frame ( ILBCContext * s )

static

Definition at line 128 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ index_conv()

static void index_conv ( int16_t * index )

static

Definition at line 268 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ lsf_dequantization()

static void lsf_dequantization	(	int16_t *	lsfdeq,
		int16_t *	index,
		int16_t	lpc_n
	)

static

Definition at line 281 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ lsf_check_stability()

static void lsf_check_stability	(	int16_t *	lsf,
		int	dim,
		int	nb_vectors
	)

static

Definition at line 309 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ lsf_interpolate()

static void lsf_interpolate	(	int16_t *	out,
		int16_t *	in1,
		int16_t *	in2,
		int16_t	coef,
		int	size
	)

static

Definition at line 332 of file ilbcdec.c.

Referenced by lsp_interpolate2polydec().

◆ lsf2lsp()

static void lsf2lsp	(	int16_t *	lsf,
		int16_t *	lsp,
		int	order
	)

static

Definition at line 342 of file ilbcdec.c.

Referenced by lsf2poly().

◆ get_lsp_poly()

static void get_lsp_poly	(	int16_t *	lsp,
		int32_t *	f
	)

static

Definition at line 365 of file ilbcdec.c.

Referenced by lsf2poly().

◆ lsf2poly()

static void lsf2poly	(	int16_t *	a,
		int16_t *	lsf
	)

static

Definition at line 392 of file ilbcdec.c.

Referenced by lsp_interpolate2polydec().

◆ lsp_interpolate2polydec()

static void lsp_interpolate2polydec	(	int16_t *	a,
		int16_t *	lsf1,
		int16_t *	lsf2,
		int	coef,
		int	length
	)

static

Definition at line 419 of file ilbcdec.c.

Referenced by lsp_interpolate().

◆ bw_expand()

static void bw_expand	(	int16_t *	out,
		const int16_t *	in,
		const int16_t *	coef,
		int	length
	)

static

Definition at line 428 of file ilbcdec.c.

Referenced by lsp_interpolate().

◆ lsp_interpolate()

static void lsp_interpolate	(	int16_t *	syntdenum,
		int16_t *	weightdenum,
		int16_t *	lsfdeq,
		int16_t	length,
		ILBCContext *	s
	)

static

Definition at line 437 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ filter_mafq12()

static void filter_mafq12	(	int16_t *	in_ptr,
		int16_t *	out_ptr,
		int16_t *	B,
		int16_t	B_length,
		int16_t	length
	)

static

Definition at line 479 of file ilbcdec.c.

Referenced by get_codebook(), and state_construct().

◆ filter_arfq12()

static void filter_arfq12	(	const int16_t *	data_in,
		int16_t *	data_out,
		const int16_t *	coefficients,
		int	coefficients_length,
		int	data_length
	)

static

Definition at line 499 of file ilbcdec.c.

Referenced by ilbc_decode_frame(), and state_construct().

◆ state_construct()

static void state_construct	(	int16_t	ifm,
		int16_t *	idx,
		int16_t *	synt_denum,
		int16_t *	Out_fix,
		int16_t	len
	)

static

Definition at line 521 of file ilbcdec.c.

Referenced by decode_residual().

◆ gain_dequantization()

static int16_t gain_dequantization	(	int	index,
		int	max_in,
		int	stage
	)

static

Definition at line 600 of file ilbcdec.c.

Referenced by construct_vector().

◆ vector_rmultiplication()

static void vector_rmultiplication	(	int16_t *	out,
		const int16_t *	in,
		const int16_t *	win,
		int	length,
		int	shift
	)

static

Definition at line 607 of file ilbcdec.c.

Referenced by create_augmented_vector().

◆ vector_multiplication()

static void vector_multiplication	(	int16_t *	out,
		const int16_t *	in,
		const int16_t *	win,
		int	length,
		int	shift
	)

static

Definition at line 615 of file ilbcdec.c.

Referenced by create_augmented_vector().

◆ add_vector_and_shift()

static void add_vector_and_shift	(	int16_t *	out,
		const int16_t *	in1,
		const int16_t *	in2,
		int	length,
		int	shift
	)

static

Definition at line 623 of file ilbcdec.c.

Referenced by create_augmented_vector().

◆ create_augmented_vector()

static void create_augmented_vector	(	int	index,
		int16_t *	buffer,
		int16_t *	cbVec
	)

static

Definition at line 631 of file ilbcdec.c.

Referenced by get_codebook().

◆ get_codebook()

static void get_codebook	(	int16_t *	cbvec,
		int16_t *	mem,
		int16_t	index,
		int16_t	lMem,
		int16_t	cbveclen
	)

static

Definition at line 646 of file ilbcdec.c.

Referenced by construct_vector().

◆ construct_vector()

static void construct_vector	(	int16_t *	decvector,
		int16_t *	index,
		int16_t *	gain_index,
		int16_t *	mem,
		int16_t	lMem,
		int16_t	veclen
	)

static

Definition at line 715 of file ilbcdec.c.

Referenced by decode_residual().

◆ reverse_memcpy()

static void reverse_memcpy	(	int16_t *	dest,
		int16_t *	source,
		int	length
	)

static

Definition at line 754 of file ilbcdec.c.

Referenced by decode_residual().

◆ decode_residual()

static void decode_residual	(	ILBCContext *	s,
		ILBCFrame *	encbits,
		int16_t *	decresidual,
		int16_t *	syntdenum
	)

static

Definition at line 764 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ max_abs_value_w16()

static int16_t max_abs_value_w16	(	const int16_t *	vector,
		int	length
	)

static

Definition at line 865 of file ilbcdec.c.

Referenced by do_plc(), and xcorr_coeff().

◆ get_size_in_bits()

static int16_t get_size_in_bits ( uint32_t n )

static

Definition at line 883 of file ilbcdec.c.

Referenced by do_plc().

◆ scale_dot_product()

static int32_t scale_dot_product	(	const int16_t *	v1,
		const int16_t *	v2,
		int	length,
		int	scaling
	)

static

Definition at line 902 of file ilbcdec.c.

Referenced by correlation(), do_plc(), and xcorr_coeff().

◆ correlation()

static void correlation	(	int32_t *	corr,
		int32_t *	ener,
		int16_t *	buffer,
		int16_t	lag,
		int16_t	blen,
		int16_t	srange,
		int16_t	scale
	)

static

Definition at line 912 of file ilbcdec.c.

Referenced by do_plc(), and yae_align().

◆ norm_w32()

static int16_t norm_w32 ( int32_t a )

static

Definition at line 930 of file ilbcdec.c.

Referenced by do_plc(), and xcorr_coeff().

◆ div_w32_w16()

static int32_t div_w32_w16	(	int32_t	num,
		int16_t	den
	)

static

Definition at line 941 of file ilbcdec.c.

Referenced by do_plc().

◆ do_plc()

static void do_plc	(	int16_t *	plc_residual,
		int16_t *	plc_lpc,
		int16_t	PLI,
		int16_t *	decresidual,
		int16_t *	lpc,
		int16_t	inlag,
		ILBCContext *	s
	)

static

Definition at line 949 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ xcorr_coeff()

static int xcorr_coeff	(	int16_t *	target,
		int16_t *	regressor,
		int16_t	subl,
		int16_t	searchLen,
		int16_t	offset,
		int16_t	step
	)

static

Definition at line 1203 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ hp_output()

static void hp_output	(	int16_t *	signal,
		const int16_t *	ba,
		int16_t *	y,
		int16_t *	x,
		int16_t	len
	)

static

Definition at line 1315 of file ilbcdec.c.

Referenced by ilbc_decode_frame().

◆ ilbc_decode_frame()

static int ilbc_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_frame_ptr,
		AVPacket *	avpkt
	)

static

Definition at line 1357 of file ilbcdec.c.

◆ ilbc_decode_init()

static av_cold int ilbc_decode_init ( AVCodecContext * avctx )

static

Definition at line 1445 of file ilbcdec.c.

Variable Documentation

◆ ff_ilbc_decoder

AVCodec ff_ilbc_decoder

Initial value:

= {
    .name           = "ilbc",
    .long_name      = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_ILBC,
    .init           = ilbc_decode_init,
    .decode         = ilbc_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .priv_data_size = sizeof(ILBCContext),
}

Definition at line 1480 of file ilbcdec.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ LPC_N_20MS

◆ LPC_N_30MS

◆ LPC_N_MAX

◆ LSF_NSPLIT

◆ NASUB_MAX [1/2]

◆ LPC_FILTERORDER

◆ NSUB_MAX [1/2]

◆ SUBL

◆ ST_MEM_L_TBL

◆ MEM_LF_TBL

◆ STATE_SHORT_LEN_20MS [1/2]

◆ STATE_SHORT_LEN_30MS [1/2]

◆ BLOCKL_MAX [1/2]

◆ CB_MEML

◆ CB_NSTAGES

◆ CB_HALFFILTERLEN

◆ CB_FILTERLEN

◆ ENH_NBLOCKS_TOT

◆ ENH_BLOCKL

◆ ENH_BUFL

◆ ENH_BUFL_FILTEROVERHEAD

◆ BLOCKL_MAX [2/2]

◆ NSUB_20MS

◆ NSUB_30MS

◆ NSUB_MAX [2/2]

◆ NASUB_20MS

◆ NASUB_30MS

◆ NASUB_MAX [2/2]

◆ STATE_LEN

◆ STATE_SHORT_LEN_30MS [2/2]

◆ STATE_SHORT_LEN_20MS [2/2]

◆ SPL_MUL_16_16

◆ SPL_MUL_16_16_RSFT

◆ SPL_SHIFT_W32

Function Documentation

◆ unpack_frame()

◆ index_conv()

◆ lsf_dequantization()

◆ lsf_check_stability()

◆ lsf_interpolate()

◆ lsf2lsp()

◆ get_lsp_poly()

◆ lsf2poly()

◆ lsp_interpolate2polydec()

◆ bw_expand()

◆ lsp_interpolate()

◆ filter_mafq12()

◆ filter_arfq12()

◆ state_construct()

◆ gain_dequantization()

◆ vector_rmultiplication()

◆ vector_multiplication()

◆ add_vector_and_shift()

◆ create_augmented_vector()

◆ get_codebook()

◆ construct_vector()

◆ reverse_memcpy()

◆ decode_residual()

◆ max_abs_value_w16()

◆ get_size_in_bits()

◆ scale_dot_product()

◆ correlation()

◆ norm_w32()

◆ div_w32_w16()

◆ do_plc()

◆ xcorr_coeff()

◆ hp_output()

◆ ilbc_decode_frame()

◆ ilbc_decode_init()

Variable Documentation

◆ ff_ilbc_decoder