sipr.c File Reference

#include <math.h>
#include <stdint.h>
#include <string.h>
#include "libavutil/channel_layout.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mathematics.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "lsp.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

Macros
#define	BITSTREAM_READER_LE
#define	MAX_SUBFRAME_COUNT   5

Functions
static void	dequant (float *out, const int *idx, const float *const 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). More...
static void	decode_parameters (SiprParameters *parms, GetBitContext *pgb, const SiprModeParam *p)
	Extract decoding parameters from the input bitstream. More...
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. More...
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. More...
static void	postfilter_5k0 (SiprContext *ctx, const float *lpc, float *samples)
	Apply postfilter, very similar to AMR one. More...
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, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)

Variables
static const SiprModeParam	modes [MODE_COUNT]
const float	ff_pow_0_5 []
const FFCodec	ff_sipr_decoder

Macro Definition Documentation

BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 32 of file sipr.c.

MAX_SUBFRAME_COUNT

#define MAX_SUBFRAME_COUNT   5

Definition at line 43 of file sipr.c.

Function Documentation

dequant()

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

static

Definition at line 143 of file sipr.c.

Referenced by lsf_decode_fp().

lsf_decode_fp()

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

static

Definition at line 154 of file sipr.c.

Referenced by decode_frame().

pitch_sharpening()

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 180 of file sipr.c.

Referenced by eval_ir().

decode_parameters()

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 194 of file sipr.c.

Referenced by sipr_decode_frame().

sipr_decode_lp()

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

static

Definition at line 217 of file sipr.c.

Referenced by decode_frame().

eval_ir()

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 238 of file sipr.c.

Referenced by decode_frame().

convolute_with_sparse()

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 260 of file sipr.c.

Referenced by decode_frame().

postfilter_5k0()

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

static

Apply postfilter, very similar to AMR one.

Definition at line 274 of file sipr.c.

Referenced by decode_frame().

decode_fixed_sparse()

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

static

Definition at line 309 of file sipr.c.

Referenced by decode_frame().

decode_frame()

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

static

Definition at line 365 of file sipr.c.

Referenced by sipr_decoder_init().

sipr_decoder_init()

static av_cold int sipr_decoder_init ( AVCodecContext *  avctx )

static

Definition at line 481 of file sipr.c.

sipr_decode_frame()

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

static

Definition at line 523 of file sipr.c.

Variable Documentation

modes

const SiprModeParam modes[MODE_COUNT]

static

Definition at line 70 of file sipr.c.

Referenced by decode_frame(), sipr_decode_frame(), and sipr_decoder_init().

ff_pow_0_5

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 136 of file sipr.c.

Referenced by postfilter(), and postfilter_5k0().

ff_sipr_decoder

const FFCodec ff_sipr_decoder

Initial value:

= {
    .p.name         = "sipr",
    CODEC_LONG_NAME("RealAudio SIPR / ACELP.NET"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_SIPR,
    .priv_data_size = sizeof(SiprContext),
    .init           = sipr_decoder_init,
    FF_CODEC_DECODE_CB(sipr_decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
}

Definition at line 564 of file sipr.c.