#include <inttypes.h>
#include <string.h>
#include "avcodec.h"
#include "libavutil/avutil.h"
#include "get_bits.h"
#include "audiodsp.h"
#include "codec_internal.h"
#include "decode.h"
#include "g729.h"
#include "lsp.h"
#include "celp_filters.h"
#include "acelp_filters.h"
#include "acelp_pitch_delay.h"
#include "acelp_vectors.h"
#include "g729data.h"
#include "g729postfilter.h"

Data Structures
struct	G729FormatDescription

struct	G729ChannelContext

struct	G729Context

Macros
#define	LSFQ_MIN 40
	minimum quantized LSF value (3.2.4) 0.005 in Q13 More...

#define	LSFQ_MAX 25681
	maximum quantized LSF value (3.2.4) 3.135 in Q13 More...

#define	LSFQ_DIFF_MIN 321
	minimum LSF distance (3.2.4) 0.0391 in Q13 More...

#define	INTERPOL_LEN 11
	interpolation filter length More...

#define	SHARP_MIN 3277
	minimum gain pitch value (3.8, Equation 47) 0.2 in (1.14) More...

#define	SHARP_MAX 13017
	maximum gain pitch value (3.8, Equation 47) (EE) This does not comply with the specification. More...

#define	MR_ENERGY 1018156
	MR_ENERGY (mean removed energy) = mean_energy + 10 * log10(2^26 * subframe_size) in (7.13) More...

#define	DECISION_NOISE 0

#define	DECISION_INTERMEDIATE 1

#define	DECISION_VOICE 2

Enumerations
enum	G729Formats { FORMAT_G729_8K = 0, FORMAT_G729D_6K4, FORMAT_COUNT }

Functions
static uint16_t	g729_prng (uint16_t value)
	pseudo random number generator More...

static void	lsf_decode (int16_t lsfq, int16_t past_quantizer_outputs[MA_NP+1], int16_t ma_predictor, int16_t vq_1st, int16_t vq_2nd_low, int16_t vq_2nd_high)
	Decodes LSF (Line Spectral Frequencies) from L0-L3 (3.2.4). More...

static void	lsf_restore_from_previous (int16_t lsfq, int16_t past_quantizer_outputs[MA_NP+1], int ma_predictor_prev)
	Restores past LSP quantizer output using LSF from previous frame. More...

static void	g729d_get_new_exc (int16_t out, const int16_t in, const int16_t *fc_cur, int dstate, int gain_code, int subframe_size)
	Constructs new excitation signal and applies phase filter to it. More...

static int	g729d_onset_decision (int past_onset, const int16_t *past_gain_code)
	Makes decision about onset in current subframe. More...

static int16_t	g729d_voice_decision (int onset, int prev_voice_decision, const int16_t *past_gain_pitch)
	Makes decision about voice presence in current subframe. More...

static int32_t	scalarproduct_int16_c (const int16_t v1, const int16_t v2, int order)

static av_cold int	decoder_init (AVCodecContext *avctx)

static int	decode_frame (AVCodecContext avctx, AVFrame frame, int got_frame_ptr, AVPacket avpkt)

static av_cold int	decode_close (AVCodecContext *avctx)

Variables
static const G729FormatDescription	format_g729_8k

static const G729FormatDescription	format_g729d_6k4

const FFCodec	ff_g729_decoder

const FFCodec	ff_acelp_kelvin_decoder

Macro Definition Documentation

◆ LSFQ_MIN

#define LSFQ_MIN 40

minimum quantized LSF value (3.2.4) 0.005 in Q13

Definition at line 46 of file g729dec.c.

◆ LSFQ_MAX

#define LSFQ_MAX 25681

maximum quantized LSF value (3.2.4) 3.135 in Q13

Definition at line 52 of file g729dec.c.

◆ LSFQ_DIFF_MIN

#define LSFQ_DIFF_MIN 321

minimum LSF distance (3.2.4) 0.0391 in Q13

Definition at line 58 of file g729dec.c.

◆ INTERPOL_LEN

#define INTERPOL_LEN 11

interpolation filter length

Definition at line 61 of file g729dec.c.

◆ SHARP_MIN

#define SHARP_MIN 3277

minimum gain pitch value (3.8, Equation 47) 0.2 in (1.14)

Definition at line 67 of file g729dec.c.

◆ SHARP_MAX

#define SHARP_MAX 13017

maximum gain pitch value (3.8, Equation 47) (EE) This does not comply with the specification.

Specification says about 0.8, which should be 13107 in (1.14), but reference C code uses 13017 (equals to 0.7945) instead of it.

Definition at line 76 of file g729dec.c.

◆ MR_ENERGY

#define MR_ENERGY 1018156

MR_ENERGY (mean removed energy) = mean_energy + 10 * log10(2^26 * subframe_size) in (7.13)

Definition at line 81 of file g729dec.c.

◆ DECISION_NOISE

#define DECISION_NOISE 0

Definition at line 83 of file g729dec.c.

◆ DECISION_INTERMEDIATE

#define DECISION_INTERMEDIATE 1

Definition at line 84 of file g729dec.c.

◆ DECISION_VOICE

#define DECISION_VOICE 2

Definition at line 85 of file g729dec.c.

Enumeration Type Documentation

◆ G729Formats

enum G729Formats

Enumerator
FORMAT_G729_8K
FORMAT_G729D_6K4
FORMAT_COUNT

Definition at line 87 of file g729dec.c.

Function Documentation

◆ g729_prng()

static uint16_t g729_prng ( uint16_t value )

inlinestatic

pseudo random number generator

Definition at line 185 of file g729dec.c.

Referenced by decode_frame().

◆ lsf_decode()

static void lsf_decode	(	int16_t *	lsfq,
		int16_t *	past_quantizer_outputs[MA_NP+1],
		int16_t	ma_predictor,
		int16_t	vq_1st,
		int16_t	vq_2nd_low,
		int16_t	vq_2nd_high
	)

static

Decodes LSF (Line Spectral Frequencies) from L0-L3 (3.2.4).

Parameters

[out]	lsfq	(2.13) quantized LSF coefficients
[in,out]	past_quantizer_outputs	(2.13) quantizer outputs from previous frames
	ma_predictor	switched MA predictor of LSP quantizer
	vq_1st	first stage vector of quantizer
	vq_2nd_low	second stage lower vector of LSP quantizer
	vq_2nd_high	second stage higher vector of LSP quantizer

Definition at line 199 of file g729dec.c.

Referenced by decode_frame().

◆ lsf_restore_from_previous()

static void lsf_restore_from_previous	(	int16_t *	lsfq,
		int16_t *	past_quantizer_outputs[MA_NP+1],
		int	ma_predictor_prev
	)

static

Restores past LSP quantizer output using LSF from previous frame.

Parameters

[in,out]	lsfq	(2.13) quantized LSF coefficients
[in,out]	past_quantizer_outputs	(2.13) quantizer outputs from previous frames
	ma_predictor_prev	MA predictor from previous frame
	lsfq_prev	(2.13) quantized LSF coefficients from previous frame

Definition at line 240 of file g729dec.c.

Referenced by decode_frame().

◆ g729d_get_new_exc()

static void g729d_get_new_exc	(	int16_t *	out,
		const int16_t *	in,
		const int16_t *	fc_cur,
		int	dstate,
		int	gain_code,
		int	subframe_size
	)

static

Constructs new excitation signal and applies phase filter to it.

Parameters

[out]	out	constructed speech signal
	in	original excitation signal
	fc_cur	(2.13) original fixed-codebook vector
	gain_code	(14.1) gain code
	subframe_size	length of the subframe

Definition at line 265 of file g729dec.c.

Referenced by decode_frame().

◆ g729d_onset_decision()

static int g729d_onset_decision	(	int	past_onset,
		const int16_t *	past_gain_code
	)

static

Makes decision about onset in current subframe.

Parameters

past_onset	decision result of previous subframe
past_gain_code	gain code of current and previous subframe

Returns: onset decision result for current subframe

Definition at line 292 of file g729dec.c.

Referenced by decode_frame().

◆ g729d_voice_decision()

static int16_t g729d_voice_decision	(	int	onset,
		int	prev_voice_decision,
		const int16_t *	past_gain_pitch
	)

static

Makes decision about voice presence in current subframe.

Parameters

onset	onset level
prev_voice_decision	voice decision result from previous subframe
past_gain_pitch	pitch gain of current and previous subframes

Returns: voice decision result for current subframe

Definition at line 308 of file g729dec.c.

Referenced by decode_frame().

◆ scalarproduct_int16_c()

static int32_t scalarproduct_int16_c	(	const int16_t *	v1,
		const int16_t *	v2,
		int	order
	)

static

Definition at line 336 of file g729dec.c.

Referenced by decoder_init().

◆ decoder_init()

static av_cold int decoder_init ( AVCodecContext * avctx )

static

Definition at line 349 of file g729dec.c.

◆ decode_frame()

static int decode_frame	(	AVCodecContext *	avctx,
		AVFrame *	frame,
		int *	got_frame_ptr,
		AVPacket *	avpkt
	)

static

< switched MA predictor of LSP quantizer

< first stage vector of quantizer

< second stage lower vector of quantizer (size in bits)

< second stage higher vector of quantizer (size in bits)

< frame erasure detected during decoding

< parity check failed

< whether one of the subframes is declared as periodic or not

< adaptive codebook index

< fixed-codebook vector pulse signs

< fixed-codebook indexes

< gain codebook (first stage) index

< gain codebook (second stage) index

Definition at line 403 of file g729dec.c.

◆ decode_close()

static av_cold int decode_close ( AVCodecContext * avctx )

static

Definition at line 746 of file g729dec.c.

Variable Documentation

◆ format_g729_8k

const G729FormatDescription format_g729_8k

static

Initial value:

= {
    .ac_index_bits     = {8,5},
    .parity_bit        = 1,
    .gc_1st_index_bits = GC_1ST_IDX_BITS_8K,
    .gc_2nd_index_bits = GC_2ND_IDX_BITS_8K,
    .fc_signs_bits     = 4,
    .fc_indexes_bits   = 13,
    .block_size        = G729_8K_BLOCK_SIZE,
}

Definition at line 162 of file g729dec.c.

Referenced by decode_frame().

◆ format_g729d_6k4

const G729FormatDescription format_g729d_6k4

static

Initial value:

= {
    .ac_index_bits     = {8,4},
    .parity_bit        = 0,
    .gc_1st_index_bits = GC_1ST_IDX_BITS_6K4,
    .gc_2nd_index_bits = GC_2ND_IDX_BITS_6K4,
    .fc_signs_bits     = 2,
    .fc_indexes_bits   = 9,
    .block_size        = G729D_6K4_BLOCK_SIZE,
}

Definition at line 172 of file g729dec.c.

Referenced by decode_frame().

◆ ff_g729_decoder

const FFCodec ff_g729_decoder

Initial value:

= {
    .p.name         = "g729",
    CODEC_LONG_NAME("G.729"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_G729,
    .priv_data_size = sizeof(G729Context),
    .init           = decoder_init,
    FF_CODEC_DECODE_CB(decode_frame),
    .close          = decode_close,
    .p.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
}

Definition at line 754 of file g729dec.c.

◆ ff_acelp_kelvin_decoder

const FFCodec ff_acelp_kelvin_decoder

Initial value:

= {
    .p.name         = "acelp.kelvin",
    CODEC_LONG_NAME("Sipro ACELP.KELVIN"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_ACELP_KELVIN,
    .priv_data_size = sizeof(G729Context),
    .init           = decoder_init,
    FF_CODEC_DECODE_CB(decode_frame),
    .close          = decode_close,
    .p.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
}

Definition at line 766 of file g729dec.c.

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ LSFQ_MIN

◆ LSFQ_MAX

◆ LSFQ_DIFF_MIN

◆ INTERPOL_LEN

◆ SHARP_MIN

◆ SHARP_MAX

◆ MR_ENERGY

◆ DECISION_NOISE

◆ DECISION_INTERMEDIATE

◆ DECISION_VOICE

Enumeration Type Documentation

◆ G729Formats

Function Documentation

◆ g729_prng()

◆ lsf_decode()

◆ lsf_restore_from_previous()

◆ g729d_get_new_exc()

◆ g729d_onset_decision()

◆ g729d_voice_decision()

◆ scalarproduct_int16_c()

◆ decoder_init()

◆ decode_frame()

◆ decode_close()

Variable Documentation

◆ format_g729_8k

◆ format_g729d_6k4

◆ ff_g729_decoder

◆ ff_acelp_kelvin_decoder