libavcodec/g729dec.c File Reference

#include <stdlib.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include "avcodec.h"
#include "libavutil/avutil.h"
#include "get_bits.h"
#include "lsp.h"
#include "celp_math.h"
#include "acelp_filters.h"
#include "acelp_pitch_delay.h"
#include "acelp_vectors.h"
#include "g729data.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	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	SUBFRAME_SIZE   40
	subframe size
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 av_cold int	decoder_init (AVCodecContext *avctx)
static int	decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Variables
static const G729FormatDescription	format_g729_8k
static const G729FormatDescription	format_g729d_6k4

---

Define Documentation

#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 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 71 of file g729dec.c.

#define SHARP_MIN   3277

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

Definition at line 62 of file g729dec.c.

Referenced by decode_frame().

#define SUBFRAME_SIZE   40

subframe size

Definition at line 76 of file g729dec.c.

Referenced by decode_frame(), and decoder_init().

---

Function Documentation

static int decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		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 198 of file g729dec.c.

static av_cold int decoder_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 172 of file g729dec.c.

Referenced by decode_frame().

static uint16_t g729_prng

(

uint16_t

value

)

[inline, static]

pseudo random number generator

Definition at line 121 of file g729dec.c.

static int get_parity

(

uint8_t

value

)

[inline, static]

Get parity bit of bit 2.

.7

Definition at line 129 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 134 of file g729dec.c.

Referenced by decode_frame().

---

Variable Documentation

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 100 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 109 of file g729dec.c.