libavcodec/g729dec.c File Reference

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

Go to the source code of this file.

Data Structures

struct G729FormatDescription

struct G729Context

Defines

#define LSFQ_MIN   40

minimum quantized LSF value (3.2.4) 0.005 in Q13

#define LSFQ_MAX   25681

maximum quantized LSF value (3.2.4) 3.135 in Q13

#define LSFQ_DIFF_MIN   321

minimum LSF distance (3.2.4) 0.0391 in Q13

#define INTERPOL_LEN   11

interpolation filter length

#define SHARP_MIN   3277

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

#define SHARP_MAX   13017

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

#define MR_ENERGY   1018156

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

#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

static int get_parity (uint8_t value)

Get parity bit of bit 2.

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 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.

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.

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

Makes decision about onset in current subframe.

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.

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

static av_cold int decoder_init (AVCodecContext *avctx)

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

Variables

static const G729FormatDescription format_g729_8k

static const G729FormatDescription format_g729d_6k4

AVCodec ff_g729_decoder

Define Documentation

#define DECISION_INTERMEDIATE 1

Definition at line 82 of file g729dec.c.

Referenced by g729d_voice_decision().

#define DECISION_NOISE 0

Definition at line 81 of file g729dec.c.

Referenced by g729d_voice_decision().

#define DECISION_VOICE 2

Definition at line 83 of file g729dec.c.

Referenced by decode_frame(), and g729d_voice_decision().

#define INTERPOL_LEN 11

interpolation filter length

Definition at line 59 of file g729dec.c.

Referenced by decode_frame(), and decoder_init().

#define LSFQ_DIFF_MIN 321

minimum LSF distance (3.2.4) 0.0391 in Q13

Definition at line 56 of file g729dec.c.

Referenced by ff_sipr_decode_frame_16k(), lsf_decode(), and lsf_decode_fp().

#define LSFQ_MAX 25681

maximum quantized LSF value (3.2.4) 3.135 in Q13

Definition at line 50 of file g729dec.c.

Referenced by lsf_decode().

#define LSFQ_MIN 40

minimum quantized LSF value (3.2.4) 0.005 in Q13

Definition at line 44 of file g729dec.c.

Referenced by lsf_decode().

#define MR_ENERGY 1018156

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

Definition at line 79 of file g729dec.c.

Referenced by decode_frame().

#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 74 of file g729dec.c.

#define SHARP_MIN 3277

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

Definition at line 65 of file g729dec.c.

Referenced by decode_frame().

Enumeration Type Documentation

enum G729Formats

Enumerator:

FORMAT_G729_8K
FORMAT_G729D_6K4
FORMAT_COUNT

Definition at line 85 of file g729dec.c.

Function Documentation

static int decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_frame_ptr,
		AVPacket *	avpkt
	)			`[static]`

< frame erasure detected during decoding

< parity check failed

< 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)

< adaptive codebook index

< fixed-codebook vector pulse signs

< fixed-codebook indexes

< gain codebook (first stage) index

< gain codebook (second stage) index

Definition at line 390 of file g729dec.c.

static av_cold int decoder_init ( AVCodecContext * avctx ) [static]

Definition at line 346 of file g729dec.c.

static uint16_t g729_prng ( uint16_t value ) [inline, static]

pseudo random number generator

Definition at line 177 of file g729dec.c.

Referenced by decode_frame().

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().

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 293 of file g729dec.c.

Referenced by decode_frame().

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 309 of file g729dec.c.

Referenced by decode_frame().

static int get_parity ( uint8_t value ) [inline, static]

Get parity bit of bit 2.

.7

Definition at line 185 of file g729dec.c.

Referenced by decode_frame().

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]`

Definition at line 199 of file g729dec.c.

Referenced by decode_frame().

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:

	lsfq	[in/out] (2.13) quantized LSF coefficients
	past_quantizer_outputs	[in/out] (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().

static int32_t scalarproduct_int16_c	(	const int16_t *	v1,
		const int16_t *	v2,
		int	order,
		int	shift
	)			`[static]`

Definition at line 336 of file g729dec.c.

Variable Documentation

AVCodec ff_g729_decoder

Initial value:

{
    "g729",
    AVMEDIA_TYPE_AUDIO,
    CODEC_ID_G729,
    sizeof(G729Context),
    decoder_init,
    NULL,
    NULL,
    decode_frame,
    .capabilities = CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("G.729"),
}

Definition at line 715 of file g729dec.c.

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,
}

Definition at line 156 of file g729dec.c.

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,
}

Definition at line 165 of file g729dec.c.


Data Structures
struct	G729FormatDescription
struct	G729Context
Defines
#define	LSFQ_MIN 40
	minimum quantized LSF value (3.2.4) 0.005 in Q13
#define	LSFQ_MAX 25681
	maximum quantized LSF value (3.2.4) 3.135 in Q13
#define	LSFQ_DIFF_MIN 321
	minimum LSF distance (3.2.4) 0.0391 in Q13
#define	INTERPOL_LEN 11
	interpolation filter length
#define	SHARP_MIN 3277
	minimum gain pitch value (3.8, Equation 47) 0.2 in (1.14)
#define	SHARP_MAX 13017
	maximum gain pitch value (3.8, Equation 47) (EE) This does not comply with the specification.
#define	MR_ENERGY 1018156
	MR_ENERGY (mean removed energy) = mean_energy + 10 * log10(2^26 * subframe_size) in (7.13).
#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
static int	get_parity (uint8_t value)
	Get parity bit of bit 2.
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 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.
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.
static int	g729d_onset_decision (int past_onset, const int16_t *past_gain_code)
	Makes decision about onset in current subframe.
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.
static int32_t	scalarproduct_int16_c (const int16_t v1, const int16_t v2, int order, int shift)
static av_cold int	decoder_init (AVCodecContext *avctx)
static int	decode_frame (AVCodecContext avctx, void data, int got_frame_ptr, AVPacket avpkt)
Variables
static const G729FormatDescription	format_g729_8k
static const G729FormatDescription	format_g729d_6k4
AVCodec	ff_g729_decoder