ref: 310af750eb5726b4143a43208f2bc03677c6f5db
dir: /silk/SKP_Silk_main_FLP.h/
/***********************************************************************
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#ifndef SKP_SILK_MAIN_FLP_H
#define SKP_SILK_MAIN_FLP_H
#include "SKP_Silk_SigProc_FLP.h"
#include "SKP_Silk_SigProc_FIX.h"
#include "SKP_Silk_structs_FLP.h"
#include "SKP_Silk_main.h"
#include "SKP_Silk_define.h"
#include "SKP_debug.h"
#include "entenc.h"
#ifdef __cplusplus
extern "C"
{
#endif
/*********************/
/* Encoder Functions */
/*********************/
/* Encoder main function */
SKP_int SKP_Silk_encode_frame_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_int32 *pnBytesOut, /* O Number of payload bytes; */
ec_enc *psRangeEnc /* I/O compressor data structure */
);
/* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */
void SKP_Silk_LBRR_encode_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
const SKP_float xfw[] /* I Input signal */
);
/* Initializes the Silk encoder state */
SKP_int SKP_Silk_init_encoder(
SKP_Silk_encoder_state_FLP *psEnc /* I/O Encoder state FLP */
);
/* Control the Silk encoder */
SKP_int SKP_Silk_control_encoder(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Pointer to Silk encoder state FLP */
SKP_SILK_SDK_EncControlStruct *encControl, /* I: Control structure */
const SKP_int32 TargetRate_bps, /* I Target max bitrate (bps) */
const SKP_int allow_bw_switch /* I Flag to allow switching audio bandwidth */
);
/****************/
/* Prefiltering */
/****************/
void SKP_Silk_prefilter_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
const SKP_Silk_encoder_control_FLP *psEncCtrl, /* I Encoder control FLP */
SKP_float xw[], /* O Weighted signal */
const SKP_float x[] /* I Speech signal */
);
/**************************/
/* Noise shaping analysis */
/**************************/
/* Compute noise shaping coefficients and initial gain values */
void SKP_Silk_noise_shape_analysis_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
const SKP_float *pitch_res, /* I LPC residual from pitch analysis */
const SKP_float *x /* I Input signal [frame_length + la_shape] */
);
/* Autocorrelations for a warped frequency axis */
void SKP_Silk_warped_autocorrelation_FLP(
SKP_float *corr, /* O Result [order + 1] */
const SKP_float *input, /* I Input data to correlate */
const SKP_float warping, /* I Warping coefficient */
const SKP_int length, /* I Length of input */
const SKP_int order /* I Correlation order (even) */
);
/* Calculation of LTP state scaling */
void SKP_Silk_LTP_scale_ctrl_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl /* I/O Encoder control FLP */
);
/**********************************************/
/* Prediction Analysis */
/**********************************************/
/* Find pitch lags */
void SKP_Silk_find_pitch_lags_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
SKP_float res[], /* O Residual */
const SKP_float x[] /* I Speech signal */
);
/* Find LPC and LTP coefficients */
void SKP_Silk_find_pred_coefs_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
const SKP_float res_pitch[], /* I Residual from pitch analysis */
const SKP_float x[] /* I Speech signal */
);
/* LPC analysis */
void SKP_Silk_find_LPC_FLP(
SKP_int16 NLSF_Q15[], /* O NLSFs */
SKP_int8 *interpIndex, /* O NLSF interp. index for NLSF interp. */
const SKP_int16 prev_NLSFq_Q15[], /* I Previous NLSFs, for NLSF interpolation */
const SKP_int useInterpNLSFs, /* I Flag */
const SKP_int firstFrameAfterReset, /* I Flag */
const SKP_int LPC_order, /* I LPC order */
const SKP_float x[], /* I Input signal */
const SKP_int subfr_length, /* I Subframe length incl preceeding samples */
const SKP_int nb_subfr /* I: Number of subframes */
);
/* LTP analysis */
void SKP_Silk_find_LTP_FLP(
SKP_float b[ MAX_NB_SUBFR * LTP_ORDER ], /* O LTP coefs */
SKP_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
SKP_float *LTPredCodGain, /* O LTP coding gain */
const SKP_float r_lpc[], /* I LPC residual */
const SKP_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
const SKP_float Wght[ MAX_NB_SUBFR ], /* I Weights */
const SKP_int subfr_length, /* I Subframe length */
const SKP_int nb_subfr, /* I number of subframes */
const SKP_int mem_offset /* I Number of samples in LTP memory */
);
void SKP_Silk_LTP_analysis_filter_FLP(
SKP_float *LTP_res, /* O LTP res MAX_NB_SUBFR*(pre_lgth+subfr_lngth) */
const SKP_float *x, /* I Input signal, with preceeding samples */
const SKP_float B[ LTP_ORDER * MAX_NB_SUBFR ], /* I LTP coefficients for each subframe */
const SKP_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lags */
const SKP_float invGains[ MAX_NB_SUBFR ], /* I Inverse quantization gains */
const SKP_int subfr_length, /* I Length of each subframe */
const SKP_int nb_subfr, /* I number of subframes */
const SKP_int pre_length /* I Preceeding samples for each subframe */
);
/* Calculates residual energies of input subframes where all subframes have LPC_order */
/* of preceeding samples */
void SKP_Silk_residual_energy_FLP(
SKP_float nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */
const SKP_float x[], /* I Input signal */
const SKP_float a[ 2 ][ MAX_LPC_ORDER ],/* I AR coefs for each frame half */
const SKP_float gains[], /* I Quantization gains */
const SKP_int subfr_length, /* I Subframe length */
const SKP_int nb_subfr, /* I number of subframes */
const SKP_int LPC_order /* I LPC order */
);
/* 16th order LPC analysis filter */
void SKP_Silk_LPC_analysis_filter_FLP(
SKP_float r_LPC[], /* O LPC residual signal */
const SKP_float PredCoef[], /* I LPC coefficients */
const SKP_float s[], /* I Input signal */
const SKP_int length, /* I Length of input signal */
const SKP_int Order /* I LPC order */
);
/* LTP tap quantizer */
void SKP_Silk_quant_LTP_gains_FLP(
SKP_float B[ MAX_NB_SUBFR * LTP_ORDER ], /* I/O (Un-)quantized LTP gains */
SKP_int8 cbk_index[ MAX_NB_SUBFR ], /* O Codebook index */
SKP_int8 *periodicity_index, /* O Periodicity index */
const SKP_float W[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* I Error weights */
const SKP_int mu_Q10, /* I Mu value (R/D tradeoff) */
const SKP_int lowComplexity, /* I Flag for low complexity */
const SKP_int nb_subfr /* I number of subframes */
);
/******************/
/* NLSF Quantizer */
/******************/
/* Limit, stabilize, and quantize NLSFs */
void SKP_Silk_process_NLSFs_FLP(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder state */
SKP_float PredCoef[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */
SKP_int16 NLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */
const SKP_int16 prev_NLSF_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */
);
/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
SKP_float SKP_Silk_residual_energy_covar_FLP( /* O Weighted residual energy */
const SKP_float *c, /* I Filter coefficients */
SKP_float *wXX, /* I/O Weighted correlation matrix, reg. out */
const SKP_float *wXx, /* I Weighted correlation vector */
const SKP_float wxx, /* I Weighted correlation value */
const SKP_int D /* I Dimension */
);
/* Entropy constrained MATRIX-weighted VQ, for a single input data vector */
void SKP_Silk_VQ_WMat_EC_FLP(
SKP_int *ind, /* O Index of best codebook vector */
SKP_float *rate_dist, /* O Best weighted quant. error + mu * rate */
const SKP_float *in, /* I Input vector to be quantized */
const SKP_float *W, /* I Weighting matrix */
const SKP_int16 *cb, /* I Codebook */
const SKP_int16 *cl_Q6, /* I Code length for each codebook vector */
const SKP_float mu, /* I Tradeoff between WSSE and rate */
const SKP_int L /* I Number of vectors in codebook */
);
/* Processing of gains */
void SKP_Silk_process_gains_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl /* I/O Encoder control FLP */
);
/******************/
/* Linear Algebra */
/******************/
/* Calculates correlation matrix X'*X */
void SKP_Silk_corrMatrix_FLP(
const SKP_float *x, /* I x vector [ L+order-1 ] used to create X */
const SKP_int L, /* I Length of vectors */
const SKP_int Order, /* I Max lag for correlation */
SKP_float *XX /* O X'*X correlation matrix [order x order] */
);
/* Calculates correlation vector X'*t */
void SKP_Silk_corrVector_FLP(
const SKP_float *x, /* I x vector [L+order-1] used to create X */
const SKP_float *t, /* I Target vector [L] */
const SKP_int L, /* I Length of vecors */
const SKP_int Order, /* I Max lag for correlation */
SKP_float *Xt /* O X'*t correlation vector [order] */
);
/* Add noise to matrix diagonal */
void SKP_Silk_regularize_correlations_FLP(
SKP_float *XX, /* I/O Correlation matrices */
SKP_float *xx, /* I/O Correlation values */
const SKP_float noise, /* I Noise energy to add */
const SKP_int D /* I Dimension of XX */
);
/* Function to solve linear equation Ax = b, where A is an MxM symmetric matrix */
void SKP_Silk_solve_LDL_FLP(
SKP_float *A, /* I/O Symmetric square matrix, out: reg. */
const SKP_int M, /* I Size of matrix */
const SKP_float *b, /* I Pointer to b vector */
SKP_float *x /* O Pointer to x solution vector */
);
/* Apply sine window to signal vector. */
/* Window types: */
/* 1 -> sine window from 0 to pi/2 */
/* 2 -> sine window from pi/2 to pi */
void SKP_Silk_apply_sine_window_FLP(
SKP_float px_win[], /* O Pointer to windowed signal */
const SKP_float px[], /* I Pointer to input signal */
const SKP_int win_type, /* I Selects a window type */
const SKP_int length /* I Window length, multiple of 4 */
);
/* Wrappers. Calls flp / fix code */
/* Convert AR filter coefficients to NLSF parameters */
void SKP_Silk_A2NLSF_FLP(
SKP_int16 *NLSF_Q15, /* O NLSF vector [ LPC_order ] */
const SKP_float *pAR, /* I LPC coefficients [ LPC_order ] */
const SKP_int LPC_order /* I LPC order */
);
/* Convert NLSF parameters to AR prediction filter coefficients */
void SKP_Silk_NLSF2A_stable_FLP(
SKP_float *pAR, /* O LPC coefficients [ LPC_order ] */
const SKP_int16 *NLSF_Q15, /* I NLSF vector [ LPC_order ] */
const SKP_int LPC_order /* I LPC order */
);
/****************************************/
/* Floating-point Silk NSQ wrapper */
/****************************************/
void SKP_Silk_NSQ_wrapper_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
SideInfoIndices *psIndices, /* I/O Quantization indices */
SKP_Silk_nsq_state *psNSQ, /* I/O Noise Shaping Quantzation state */
SKP_int8 pulses[], /* O Quantized pulse signal */
const SKP_float x[] /* I Prefiltered input signal */
);
/* using log2() helps the fixed-point conversion */
SKP_INLINE SKP_float SKP_Silk_log2( double x ) { return ( SKP_float )( 3.32192809488736 * log10( x ) ); }
#ifdef __cplusplus
}
#endif
#endif