G.723.1 types, functions and data tables. More...

#include <stdint.h>
#include "libavutil/log.h"

Data Structures
struct	G723_1_Subframe
	G723.1 unpacked data subframe. More...

struct	PPFParam
	Pitch postfilter parameters. More...

struct	HFParam
	Harmonic filter parameters. More...

struct	FCBParam
	Optimized fixed codebook excitation parameters. More...

struct	G723_1_Context

Macros
#define	SUBFRAMES 4

#define	SUBFRAME_LEN 60

#define	FRAME_LEN (SUBFRAME_LEN << 2)

#define	HALF_FRAME_LEN (FRAME_LEN / 2)

#define	LPC_FRAME (HALF_FRAME_LEN + SUBFRAME_LEN)

#define	LPC_ORDER 10

#define	LSP_BANDS 3

#define	LSP_CB_SIZE 256

#define	PITCH_MIN 18

#define	PITCH_MAX (PITCH_MIN + 127)

#define	PITCH_ORDER 5

#define	GRID_SIZE 2

#define	PULSE_MAX 6

#define	GAIN_LEVELS 24

#define	COS_TBL_SIZE 512

#define	MULL2(a, b) ((((a) >> 16) * (b) * 2) + (((a) & 0xffff) * (b) >> 15))
	Bitexact implementation of 2ab scaled by 1/2^16. More...

Enumerations
enum	FrameType { ACTIVE_FRAME, SID_FRAME, UNTRANSMITTED_FRAME, INTRA_FRAME = 0, INTER_FRAME, SKIP_FRAME, FIRST_FRAME, INNER_FRAME, FINAL_FRAME, LINEAR_MODE, FRAME_NB }
	G723.1 frame types. More...

enum	Rate { RATE_6300, RATE_5300 }
	G723.1 rate values. More...

Functions
int	ff_g723_1_scale_vector (int16_t dst, const int16_t vector, int length)
	Scale vector contents based on the largest of their absolutes. More...

int	ff_g723_1_normalize_bits (int num, int width)
	Calculate the number of left-shifts required for normalizing the input. More...

int	ff_g723_1_dot_product (const int16_t a, const int16_t b, int length)

void	ff_g723_1_get_residual (int16_t residual, int16_t prev_excitation, int lag)
	Get delayed contribution from the previous excitation vector. More...

void	ff_g723_1_gen_dirac_train (int16_t *buf, int pitch_lag)
	Generate a train of dirac functions with period as pitch lag. More...

void	ff_g723_1_gen_acb_excitation (int16_t vector, int16_t prev_excitation, int pitch_lag, G723_1_Subframe *subfrm, enum Rate cur_rate)
	Generate adaptive codebook excitation. More...

void	ff_g723_1_lsp_interpolate (int16_t lpc, int16_t cur_lsp, int16_t *prev_lsp)
	Quantize LSP frequencies by interpolation and convert them to the corresponding LPC coefficients. More...

void	ff_g723_1_inverse_quant (int16_t cur_lsp, int16_t prev_lsp, uint8_t *lsp_index, int bad_frame)
	Perform inverse quantization of LSP frequencies. More...

Variables
static const uint8_t	frame_size [4] = { 24, 20, 4, 1 }

static const int16_t	ppf_gain_weight [2] = {0x1800, 0x2000}
	Postfilter gain weighting factors scaled by 2^15. More...

static const int16_t	dc_lsp [LPC_ORDER]
	LSP DC component. More...

static const int16_t	cos_tab [COS_TBL_SIZE+1]

static const int16_t	lsp_band0 [LSP_CB_SIZE][3]
	LSP VQ tables. More...

static const int16_t	lsp_band1 [LSP_CB_SIZE][3]

static const int16_t	lsp_band2 [LSP_CB_SIZE][4]

static const int32_t	combinatorial_table [PULSE_MAX][SUBFRAME_LEN/GRID_SIZE]
	Used for the coding/decoding of the pulses positions for the MP-MLQ codebook. More...

static const int16_t	pitch_contrib [340]

static const int8_t	pulses [4] = {6, 5, 6, 5}
	Number of non-zero pulses in the MP-MLQ excitation. More...

static const int32_t	max_pos [4] = {593775, 142506, 593775, 142506}
	Size of the MP-MLQ fixed excitation codebooks. More...

static const int16_t	fixed_cb_gain [GAIN_LEVELS]

static const int16_t	adaptive_cb_gain85 [85 *20]

static const int16_t	adaptive_cb_gain170 [170 *20]

static const int16_t	postfilter_tbl [2][LPC_ORDER]
	0.65^i (Zero part) and 0.75^i (Pole part) scaled by 2^15 More...

static const int16_t	hamming_window [LPC_FRAME]
	Hamming window coefficients scaled by 2^15. More...

static const int16_t	binomial_window [LPC_ORDER]
	Binomial window coefficients scaled by 2^15. More...

static const int16_t	bandwidth_expand [LPC_ORDER]
	0.994^i scaled by 2^15 More...

static const int16_t	percept_flt_tbl [2][LPC_ORDER]
	0.5^i scaled by 2^15 More...

static const int	cng_adaptive_cb_lag [4] = { 1, 0, 1, 3 }

static const int	cng_filt [4] = { 273, 998, 499, 333 }

static const int	cng_bseg [3] = { 2048, 18432, 231233 }

Detailed Description

G.723.1 types, functions and data tables.

Definition in file g723_1.h.

Macro Definition Documentation

#define SUBFRAMES 4

Definition at line 35 of file g723_1.h.

#define SUBFRAME_LEN 60

#define FRAME_LEN (SUBFRAME_LEN << 2)

Definition at line 37 of file g723_1.h.

Referenced by autocorr_max(), comp_interp_index(), formant_postfilter(), g723_1_decode_frame(), g723_1_encode_frame(), generate_noise(), highpass_filter(), perceptual_filter(), and residual_interp().

#define HALF_FRAME_LEN (FRAME_LEN / 2)

Definition at line 38 of file g723_1.h.

Referenced by estimate_pitch(), and g723_1_encode_frame().

#define LPC_FRAME (HALF_FRAME_LEN + SUBFRAME_LEN)

Definition at line 39 of file g723_1.h.

Referenced by comp_autocorr().

#define LSP_BANDS 3

Definition at line 41 of file g723_1.h.

#define LSP_CB_SIZE 256

Definition at line 42 of file g723_1.h.

#define PITCH_MIN 18

Definition at line 43 of file g723_1.h.

Referenced by acb_search(), estimate_pitch(), ff_sipr_decode_frame_16k(), pack_bitstream(), and unpack_bitstream().

#define PITCH_MAX (PITCH_MIN + 127)

Definition at line 44 of file g723_1.h.

Referenced by acb_search(), autocorr_max(), comp_interp_index(), estimate_pitch(), ff_g723_1_get_residual(), ff_sipr_decode_frame_16k(), g723_1_decode_frame(), g723_1_encode_frame(), generate_noise(), and residual_interp().

#define PITCH_ORDER 5

Definition at line 45 of file g723_1.h.

Referenced by acb_search(), ff_g723_1_gen_acb_excitation(), ff_g723_1_get_residual(), and g723_1_encode_frame().

#define GRID_SIZE 2

Definition at line 46 of file g723_1.h.

Referenced by gen_fcb_excitation(), and get_fcb_param().

#define PULSE_MAX 6

Definition at line 47 of file g723_1.h.

#define GAIN_LEVELS 24

Definition at line 48 of file g723_1.h.

Referenced by get_fcb_param(), pack_bitstream(), and unpack_bitstream().

#define COS_TBL_SIZE 512

Definition at line 49 of file g723_1.h.

Referenced by lpc2lsp().

#define MULL2	(	a,
		b
	)	((((a) >> 16) * (b) * 2) + (((a) & 0xffff) * (b) >> 15))

Bitexact implementation of 2ab scaled by 1/2^16.

Parameters

a	32 bit multiplicand
b	16 bit multiplier

Definition at line 57 of file g723_1.h.

Referenced by comp_autocorr(), highpass_filter(), levinson_durbin(), and lsp2lpc().

Enumeration Type Documentation

enum FrameType

G723.1 frame types.

Enumerator
ACTIVE_FRAME	Active speech.
SID_FRAME	Silence Insertion Descriptor frame.
UNTRANSMITTED_FRAME
INTRA_FRAME
INTER_FRAME
SKIP_FRAME
FIRST_FRAME
INNER_FRAME
FINAL_FRAME
LINEAR_MODE
FRAME_NB

Definition at line 63 of file g723_1.h.

enum Rate

G723.1 rate values.

Enumerator
RATE_6300
RATE_5300

Definition at line 72 of file g723_1.h.

Function Documentation

int ff_g723_1_scale_vector	(	int16_t *	dst,
		const int16_t *	vector,
		int	length
	)

Scale vector contents based on the largest of their absolutes.

Definition at line 32 of file g723_1.c.

Referenced by comp_autocorr(), comp_interp_index(), formant_postfilter(), and g723_1_encode_frame().

int ff_g723_1_normalize_bits	(	int	num,
		int	width
	)

Calculate the number of left-shifts required for normalizing the input.

Parameters

num	input number
width	width of the input, 16 bits(0) / 32 bits(1)

Definition at line 49 of file g723_1.c.

Referenced by acb_search(), comp_autocorr(), comp_harmonic_coeff(), comp_ppf_coeff(), estimate_pitch(), gain_scale(), get_fcb_param(), lpc2lsp(), and lsp_quantize().

int ff_g723_1_dot_product	(	const int16_t *	a,
		const int16_t *	b,
		int	length
	)

Definition at line 54 of file g723_1.c.

Referenced by acb_search(), autocorr_max(), comp_interp_index(), comp_ppf_coeff(), formant_postfilter(), and get_fcb_param().

void ff_g723_1_get_residual	(	int16_t *	residual,
		int16_t *	prev_excitation,
		int	lag
	)

Get delayed contribution from the previous excitation vector.

Definition at line 60 of file g723_1.c.

Referenced by acb_search(), and ff_g723_1_gen_acb_excitation().

void ff_g723_1_gen_dirac_train	(	int16_t *	buf,
		int	pitch_lag
	)

Generate a train of dirac functions with period as pitch lag.

Definition at line 74 of file g723_1.c.

Referenced by fcb_search(), gen_fcb_excitation(), and get_fcb_param().

void ff_g723_1_gen_acb_excitation	(	int16_t *	vector,
		int16_t *	prev_excitation,
		int	pitch_lag,
		G723_1_Subframe *	subfrm,
		enum Rate	cur_rate
	)

Generate adaptive codebook excitation.

Definition at line 86 of file g723_1.c.

Referenced by g723_1_decode_frame(), g723_1_encode_frame(), and generate_noise().

void ff_g723_1_lsp_interpolate	(	int16_t *	lpc,
		int16_t *	cur_lsp,
		int16_t *	prev_lsp
	)

Quantize LSP frequencies by interpolation and convert them to the corresponding LPC coefficients.

Parameters

lpc	buffer for LPC coefficients
cur_lsp	the current LSP vector
prev_lsp	the previous LSP vector

Definition at line 180 of file g723_1.c.

Referenced by g723_1_decode_frame(), and g723_1_encode_frame().

void ff_g723_1_inverse_quant	(	int16_t *	cur_lsp,
		int16_t *	prev_lsp,
		uint8_t *	lsp_index,
		int	bad_frame
	)

Perform inverse quantization of LSP frequencies.

Parameters

cur_lsp	the current LSP vector
prev_lsp	the previous LSP vector
lsp_index	VQ indices
bad_frame	bad frame flag

Definition at line 201 of file g723_1.c.

Referenced by g723_1_decode_frame(), and g723_1_encode_frame().

Variable Documentation

const uint8_t frame_size[4] = { 24, 20, 4, 1 }

static

Definition at line 219 of file g723_1.h.

const int16_t ppf_gain_weight[2] = {0x1800, 0x2000}

static

Postfilter gain weighting factors scaled by 2^15.

Definition at line 224 of file g723_1.h.

Referenced by comp_ppf_gains().

const int16_t dc_lsp[LPC_ORDER]

static

Initial value:

= {
    0x0c3b,
    0x1271,
    0x1e0a,
    0x2a36,
    0x3630,
    0x406f,
    0x4d28,
    0x56f4,
    0x638c,
    0x6c46
}

LSP DC component.

Definition at line 229 of file g723_1.h.

Referenced by ff_g723_1_inverse_quant(), g723_1_decode_init(), g723_1_encode_init(), and lsp_quantize().

const int16_t cos_tab[COS_TBL_SIZE+1]

static

Definition at line 243 of file g723_1.h.

const int16_t lsp_band0[LSP_CB_SIZE][3]

static

LSP VQ tables.

Definition at line 314 of file g723_1.h.

Referenced by ff_g723_1_inverse_quant().

const int16_t lsp_band1[LSP_CB_SIZE][3]

static

Definition at line 403 of file g723_1.h.

Referenced by ff_g723_1_inverse_quant().

const int16_t lsp_band2[LSP_CB_SIZE][4]

static

Definition at line 492 of file g723_1.h.

Referenced by ff_g723_1_inverse_quant().

const int32_t combinatorial_table[PULSE_MAX][SUBFRAME_LEN/GRID_SIZE]

static

Used for the coding/decoding of the pulses positions for the MP-MLQ codebook.

Definition at line 627 of file g723_1.h.

Referenced by gen_fcb_excitation(), and pack_fcb_param().

const int16_t pitch_contrib[340]

static

Definition at line 671 of file g723_1.h.

Referenced by gen_fcb_excitation().

const int8_t pulses[4] = {6, 5, 6, 5}

static

Number of non-zero pulses in the MP-MLQ excitation.

Definition at line 720 of file g723_1.h.

Referenced by celt_pulses2bits(), fcb_search(), gen_fcb_excitation(), generate_noise(), and synth_block_fcb_acb().

const int32_t max_pos[4] = {593775, 142506, 593775, 142506}

static

Size of the MP-MLQ fixed excitation codebooks.

Definition at line 725 of file g723_1.h.

Referenced by gen_fcb_excitation().

const int16_t fixed_cb_gain[GAIN_LEVELS]

static

Initial value:

= {
      1,    2,    3,    4,    6,    9,   13,   18,
     26,   38,   55,   80,  115,  166,  240,  348,
    502,  726, 1050, 1517, 2193, 3170, 4582, 6623,
}

Definition at line 727 of file g723_1.h.

Referenced by g723_1_decode_frame(), gen_fcb_excitation(), and get_fcb_param().

const int16_t adaptive_cb_gain85[85 *20]

static

Definition at line 733 of file g723_1.h.

Referenced by acb_search(), and ff_g723_1_gen_acb_excitation().

const int16_t adaptive_cb_gain170[170 *20]

static

Definition at line 949 of file g723_1.h.

Referenced by acb_search(), and ff_g723_1_gen_acb_excitation().

const int16_t postfilter_tbl[2][LPC_ORDER]

static

Initial value:

= {
    
    {21299, 13844,  8999,  5849, 3802, 2471, 1606, 1044,  679,  441},
    
    {24576, 18432, 13824, 10368, 7776, 5832, 4374, 3281, 2460, 1845}
}

0.65^i (Zero part) and 0.75^i (Pole part) scaled by 2^15

Definition at line 1380 of file g723_1.h.

Referenced by formant_postfilter().

const int16_t hamming_window[LPC_FRAME]

static

Initial value:

= {
     2621,  2631,  2659,  2705,  2770,  2853,  2955,  3074,  3212,  3367,
     3541,  3731,  3939,  4164,  4405,  4663,  4937,  5226,  5531,  5851,
     6186,  6534,  6897,  7273,  7661,  8062,  8475,  8899,  9334,  9780,
    10235, 10699, 11172, 11653, 12141, 12636, 13138, 13645, 14157, 14673,
    15193, 15716, 16242, 16769, 17298, 17827, 18356, 18884, 19411, 19935,
    20457, 20975, 21489, 21999, 22503, 23002, 23494, 23978, 24455, 24924,
    25384, 25834, 26274, 26704, 27122, 27529, 27924, 28306, 28675, 29031,
    29373, 29700, 30012, 30310, 30592, 30857, 31107, 31340, 31557, 31756,
    31938, 32102, 32249, 32377, 32488, 32580, 32654, 32710, 32747, 32766,
    32766, 32747, 32710, 32654, 32580, 32488, 32377, 32249, 32102, 31938,
    31756, 31557, 31340, 31107, 30857, 30592, 30310, 30012, 29700, 29373,
    29031, 28675, 28306, 27924, 27529, 27122, 26704, 26274, 25834, 25384,
    24924, 24455, 23978, 23494, 23002, 22503, 21999, 21489, 20975, 20457,
    19935, 19411, 18884, 18356, 17827, 17298, 16769, 16242, 15716, 15193,
    14673, 14157, 13645, 13138, 12636, 12141, 11653, 11172, 10699, 10235,
     9780, 9334,   8899,  8475,  8062,  7661,  7273,  6897,  6534,  6186,
     5851, 5531,   5226,  4937,  4663,  4405,  4164,  3939,  3731,  3541,
     3367, 3212,   3074,  2955,  2853,  2770,  2705,  2659,  2631,  2621
}

Hamming window coefficients scaled by 2^15.

Definition at line 1390 of file g723_1.h.

Referenced by comp_autocorr().

const int16_t binomial_window[LPC_ORDER]

static

Initial value:

= {
    32749, 32695, 32604, 32477, 32315, 32118, 31887, 31622, 31324, 30995
}

Binomial window coefficients scaled by 2^15.

Definition at line 1414 of file g723_1.h.

Referenced by comp_autocorr().

const int16_t bandwidth_expand[LPC_ORDER]

static

Initial value:

= {
    32571, 32376, 32182, 31989, 31797, 31606, 31416, 31228, 31040, 30854
}

0.994^i scaled by 2^15

Definition at line 1421 of file g723_1.h.

Referenced by lpc2lsp().

const int16_t percept_flt_tbl[2][LPC_ORDER]

static

Initial value:

= {
    
    {29491, 26542, 23888, 21499, 19349, 17414, 15673, 14106, 12695, 11425},
    
    {16384,  8192,  4096,  2048,  1024,   512,   256,   128,    64,    32}
}

0.5^i scaled by 2^15

Definition at line 1428 of file g723_1.h.

Referenced by perceptual_filter().

const int cng_adaptive_cb_lag[4] = { 1, 0, 1, 3 }

static

Definition at line 1435 of file g723_1.h.

Referenced by generate_noise().

const int cng_filt[4] = { 273, 998, 499, 333 }

static

Definition at line 1437 of file g723_1.h.

Referenced by estimate_sid_gain().

const int cng_bseg[3] = { 2048, 18432, 231233 }