libavcodec/sipr.c File Reference

#include <math.h>
#include <stdint.h>
#include <string.h>
#include "libavutil/mathematics.h"
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "lsp.h"
#include "celp_math.h"
#include "acelp_vectors.h"
#include "acelp_pitch_delay.h"
#include "acelp_filters.h"
#include "celp_filters.h"
#include "sipr.h"
#include "siprdata.h"

Go to the source code of this file.

Data Structures
struct	SiprModeParam
Defines
#define	ALT_BITSTREAM_READER_LE
#define	MAX_SUBFRAME_COUNT   5
Functions
static void	dequant (float *out, const int *idx, const float *cbs[])
static void	lsf_decode_fp (float *lsfnew, float *lsf_history, const SiprParameters *parm)
static void	pitch_sharpening (int pitch_lag_int, float beta, float *fixed_vector)
	Apply pitch lag to the fixed vector (AMR section 6.1.2).
static void	decode_parameters (SiprParameters *parms, GetBitContext *pgb, const SiprModeParam *p)
	Extract decoding parameters from the input bitstream.
static void	sipr_decode_lp (float *lsfnew, const float *lsfold, float *Az, int num_subfr)
static void	eval_ir (const float *Az, int pitch_lag, float *freq, float pitch_sharp_factor)
	Evaluate the adaptive impulse response.
static void	convolute_with_sparse (float *out, const AMRFixed *pulses, const float *shape, int length)
	Evaluate the convolution of a vector with a sparse vector.
static void	postfilter_5k0 (SiprContext *ctx, const float *lpc, float *samples)
	Apply postfilter, very similar to AMR one.
static void	decode_fixed_sparse (AMRFixed *fixed_sparse, const int16_t *pulses, SiprMode mode, int low_gain)
static void	decode_frame (SiprContext *ctx, SiprParameters *params, float *out_data)
static av_cold int	sipr_decoder_init (AVCodecContext *avctx)
static int	sipr_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Variables
static const SiprModeParam	modes [MODE_COUNT]
const float	ff_pow_0_5 []
AVCodec	ff_sipr_decoder

---

Define Documentation

#define ALT_BITSTREAM_READER_LE

Definition at line 30 of file sipr.c.

#define MAX_SUBFRAME_COUNT   5

Definition at line 41 of file sipr.c.

Referenced by decode_frame().

---

Function Documentation

static void convolute_with_sparse	(	float *	out,
		const AMRFixed *	pulses,
		const float *	shape,
		int	length
	)			[static]

Evaluate the convolution of a vector with a sparse vector.

Definition at line 258 of file sipr.c.

Referenced by decode_frame().

static void decode_fixed_sparse	(	AMRFixed *	fixed_sparse,
		const int16_t *	pulses,
		SiprMode	mode,
		int	low_gain
	)			[static]

Definition at line 307 of file sipr.c.

static void decode_frame	(	SiprContext *	ctx,
		SiprParameters *	params,
		float *	out_data
	)			[static]

Definition at line 363 of file sipr.c.

static void decode_parameters	(	SiprParameters *	parms,
		GetBitContext *	pgb,
		const SiprModeParam *	p
	)			[static]

Extract decoding parameters from the input bitstream.

Parameters:

	parms	parameters structure
	pgb	pointer to initialized GetBitContext structure

Definition at line 192 of file sipr.c.

Referenced by sipr_decode_frame().

static void dequant	(	float *	out,
		const int *	idx,
		const float *	cbs[]
	)			[static]

Definition at line 141 of file sipr.c.

static void eval_ir	(	const float *	Az,
		int	pitch_lag,
		float *	freq,
		float	pitch_sharp_factor
	)			[static]

Evaluate the adaptive impulse response.

Definition at line 236 of file sipr.c.

Referenced by decode_frame().

static void lsf_decode_fp	(	float *	lsfnew,
		float *	lsf_history,
		const SiprParameters *	parm
	)			[static]

Definition at line 152 of file sipr.c.

Referenced by decode_frame().

static void pitch_sharpening	(	int	pitch_lag_int,
		float	beta,
		float *	fixed_vector
	)			[static]

Apply pitch lag to the fixed vector (AMR section 6.1.2).

Definition at line 178 of file sipr.c.

static void postfilter_5k0	(	SiprContext *	ctx,
		const float *	lpc,
		float *	samples
	)			[static]

Apply postfilter, very similar to AMR one.

Definition at line 272 of file sipr.c.

Referenced by decode_frame().

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

Definition at line 516 of file sipr.c.

static void sipr_decode_lp	(	float *	lsfnew,
		const float *	lsfold,
		float *	Az,
		int	num_subfr
	)			[static]

Definition at line 215 of file sipr.c.

Referenced by decode_frame().

static av_cold int sipr_decoder_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 478 of file sipr.c.

---

Variable Documentation

const float ff_pow_0_5[]

Initial value:

 {
    1.0/(1 <<  1), 1.0/(1 <<  2), 1.0/(1 <<  3), 1.0/(1 <<  4),
    1.0/(1 <<  5), 1.0/(1 <<  6), 1.0/(1 <<  7), 1.0/(1 <<  8),
    1.0/(1 <<  9), 1.0/(1 << 10), 1.0/(1 << 11), 1.0/(1 << 12),
    1.0/(1 << 13), 1.0/(1 << 14), 1.0/(1 << 15), 1.0/(1 << 16)
}

Definition at line 134 of file sipr.c.

Referenced by postfilter(), and postfilter_5k0().

AVCodec ff_sipr_decoder

Initial value:

 {
    .name           = "sipr",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_SIPR,
    .priv_data_size = sizeof(SiprContext),
    .init           = sipr_decoder_init,
    .decode         = sipr_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("RealAudio SIPR / ACELP.NET"),
}

Definition at line 561 of file sipr.c.

const SiprModeParam modes[MODE_COUNT] [static]

Definition at line 68 of file sipr.c.

Referenced by decode_mb_mode().