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/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, (subject to the limitations in the disclaimer below)
are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#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
|
