main_FIX.h

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/***********************************************************************
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#ifndef SILK_MAIN_FIX_H
#define SILK_MAIN_FIX_H

#include "SigProc_FIX.h"
#include "structs_FIX.h"
#include "control.h"
#include "main.h"
#include "PLC.h"
#include "debug.h"
#include "entenc.h"

#ifndef FORCE_CPP_BUILD
#ifdef __cplusplus
extern "C"
{
#endif
#endif

#define silk_encoder_state_Fxx      silk_encoder_state_FIX
#define silk_encode_do_VAD_Fxx      silk_encode_do_VAD_FIX
#define silk_encode_frame_Fxx       silk_encode_frame_FIX

/*********************/
/* Encoder Functions */
/*********************/

/* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */
void silk_HP_variable_cutoff(
    silk_encoder_state_Fxx          state_Fxx[]                             /* I/O  Encoder states                                                              */
);

/* Encoder main function */
void silk_encode_do_VAD_FIX(
    silk_encoder_state_FIX          *psEnc                                  /* I/O  Pointer to Silk FIX encoder state                                           */
);

/* Encoder main function */
opus_int silk_encode_frame_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
    opus_int32                      *pnBytesOut,                            /* O    Pointer to number of payload bytes;                                         */
    ec_enc                          *psRangeEnc,                            /* I/O  compressor data structure                                                   */
    opus_int                        condCoding,                             /* I    The type of conditional coding to use                                       */
    opus_int                        maxBits,                                /* I    If > 0: maximum number of output bits                                       */
    opus_int                        useCBR                                  /* I    Flag to force constant-bitrate operation                                    */
);

/* Initializes the Silk encoder state */
opus_int silk_init_encoder(
    silk_encoder_state_Fxx          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
    int                              arch                                   /* I    Run-time architecture                                                       */
);

/* Control the Silk encoder */
opus_int silk_control_encoder(
    silk_encoder_state_Fxx          *psEnc,                                 /* I/O  Pointer to Silk encoder state                                               */
    silk_EncControlStruct           *encControl,                            /* I    Control structure                                                           */
    const opus_int32                TargetRate_bps,                         /* I    Target max bitrate (bps)                                                    */
    const opus_int                  allow_bw_switch,                        /* I    Flag to allow switching audio bandwidth                                     */
    const opus_int                  channelNb,                              /* I    Channel number                                                              */
    const opus_int                  force_fs_kHz
);

/****************/
/* Prefiltering */
/****************/
void silk_prefilter_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state                                                               */
    const silk_encoder_control_FIX  *psEncCtrl,                             /* I    Encoder control                                                             */
    opus_int32                      xw_Q10[],                               /* O    Weighted signal                                                             */
    const opus_int16                x[]                                     /* I    Speech signal                                                               */
);

void silk_warped_LPC_analysis_filter_FIX_c(
          opus_int32            state[],                    /* I/O  State [order + 1]                   */
          opus_int32            res_Q2[],                   /* O    Residual signal [length]            */
    const opus_int16            coef_Q13[],                 /* I    Coefficients [order]                */
    const opus_int16            input[],                    /* I    Input signal [length]               */
    const opus_int16            lambda_Q16,                 /* I    Warping factor                      */
    const opus_int              length,                     /* I    Length of input signal              */
    const opus_int              order                       /* I    Filter order (even)                 */
);


/**************************/
/* Noise shaping analysis */
/**************************/
/* Compute noise shaping coefficients and initial gain values */
void silk_noise_shape_analysis_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state FIX                                                           */
    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Encoder control FIX                                                         */
    const opus_int16                *pitch_res,                             /* I    LPC residual from pitch analysis                                            */
    const opus_int16                *x,                                     /* I    Input signal [ frame_length + la_shape ]                                    */
    int                              arch                                   /* I    Run-time architecture                                                       */
);

/* Autocorrelations for a warped frequency axis */
void silk_warped_autocorrelation_FIX(
          opus_int32                *corr,                                  /* O    Result [order + 1]                                                          */
          opus_int                  *scale,                                 /* O    Scaling of the correlation vector                                           */
    const opus_int16                *input,                                 /* I    Input data to correlate                                                     */
    const opus_int                  warping_Q16,                            /* I    Warping coefficient                                                         */
    const opus_int                  length,                                 /* I    Length of input                                                             */
    const opus_int                  order                                   /* I    Correlation order (even)                                                    */
);

/* Calculation of LTP state scaling */
void silk_LTP_scale_ctrl_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
);

/**********************************************/
/* Prediction Analysis                        */
/**********************************************/
/* Find pitch lags */
void silk_find_pitch_lags_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
    opus_int16                      res[],                                  /* O    residual                                                                    */
    const opus_int16                x[],                                    /* I    Speech signal                                                               */
    int                             arch                                    /* I    Run-time architecture                                                       */
);

/* Find LPC and LTP coefficients */
void silk_find_pred_coefs_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  encoder state                                                               */
    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  encoder control                                                             */
    const opus_int16                res_pitch[],                            /* I    Residual from pitch analysis                                                */
    const opus_int16                x[],                                    /* I    Speech signal                                                               */
    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
);

/* LPC analysis */
void silk_find_LPC_FIX(
    silk_encoder_state              *psEncC,                                /* I/O  Encoder state                                                               */
    opus_int16                      NLSF_Q15[],                             /* O    NLSFs                                                                       */
    const opus_int16                x[],                                    /* I    Input signal                                                                */
    const opus_int32                minInvGain_Q30                          /* I    Inverse of max prediction gain                                              */
);

/* LTP analysis */
void silk_find_LTP_FIX(
    opus_int16                      b_Q14[ MAX_NB_SUBFR * LTP_ORDER ],      /* O    LTP coefs                                                                   */
    opus_int32                      WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O    Weight for LTP quantization                                           */
    opus_int                        *LTPredCodGain_Q7,                      /* O    LTP coding gain                                                             */
    const opus_int16                r_lpc[],                                /* I    residual signal after LPC signal + state for first 10 ms                    */
    const opus_int                  lag[ MAX_NB_SUBFR ],                    /* I    LTP lags                                                                    */
    const opus_int32                Wght_Q15[ MAX_NB_SUBFR ],               /* I    weights                                                                     */
    const opus_int                  subfr_length,                           /* I    subframe length                                                             */
    const opus_int                  nb_subfr,                               /* I    number of subframes                                                         */
    const opus_int                  mem_offset,                             /* I    number of samples in LTP memory                                             */
    opus_int                        corr_rshifts[ MAX_NB_SUBFR ],           /* O    right shifts applied to correlations                                        */
    int                             arch                                    /* I    Run-time architecture                                                       */
);

void silk_LTP_analysis_filter_FIX(
    opus_int16                      *LTP_res,                               /* O    LTP residual signal of length MAX_NB_SUBFR * ( pre_length + subfr_length )  */
    const opus_int16                *x,                                     /* I    Pointer to input signal with at least max( pitchL ) preceding samples       */
    const opus_int16                LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],/* I    LTP_ORDER LTP coefficients for each MAX_NB_SUBFR subframe                   */
    const opus_int                  pitchL[ MAX_NB_SUBFR ],                 /* I    Pitch lag, one for each subframe                                            */
    const opus_int32                invGains_Q16[ MAX_NB_SUBFR ],           /* I    Inverse quantization gains, one for each subframe                           */
    const opus_int                  subfr_length,                           /* I    Length of each subframe                                                     */
    const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
    const opus_int                  pre_length                              /* I    Length of the preceding samples starting at &x[0] for each subframe         */
);

/* Calculates residual energies of input subframes where all subframes have LPC_order   */
/* of preceding samples                                                                 */
void silk_residual_energy_FIX(
          opus_int32                nrgs[ MAX_NB_SUBFR ],                   /* O    Residual energy per subframe                                                */
          opus_int                  nrgsQ[ MAX_NB_SUBFR ],                  /* O    Q value per subframe                                                        */
    const opus_int16                x[],                                    /* I    Input signal                                                                */
          opus_int16                a_Q12[ 2 ][ MAX_LPC_ORDER ],            /* I    AR coefs for each frame half                                                */
    const opus_int32                gains[ MAX_NB_SUBFR ],                  /* I    Quantization gains                                                          */
    const opus_int                  subfr_length,                           /* I    Subframe length                                                             */
    const opus_int                  nb_subfr,                               /* I    Number of subframes                                                         */
    const opus_int                  LPC_order,                              /* I    LPC order                                                                   */
    int                             arch                                    /* I    Run-time architecture                                                       */
);

/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
opus_int32 silk_residual_energy16_covar_FIX(
    const opus_int16                *c,                                     /* I    Prediction vector                                                           */
    const opus_int32                *wXX,                                   /* I    Correlation matrix                                                          */
    const opus_int32                *wXx,                                   /* I    Correlation vector                                                          */
    opus_int32                      wxx,                                    /* I    Signal energy                                                               */
    opus_int                        D,                                      /* I    Dimension                                                                   */
    opus_int                        cQ                                      /* I    Q value for c vector 0 - 15                                                 */
);

/* Processing of gains */
void silk_process_gains_FIX(
    silk_encoder_state_FIX          *psEnc,                                 /* I/O  Encoder state                                                               */
    silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Encoder control                                                             */
    opus_int                        condCoding                              /* I    The type of conditional coding to use                                       */
);

/******************/
/* Linear Algebra */
/******************/
/* Calculates correlation matrix X'*X */
void silk_corrMatrix_FIX(
    const opus_int16                *x,                                     /* I    x vector [L + order - 1] used to form data matrix X                         */
    const opus_int                  L,                                      /* I    Length of vectors                                                           */
    const opus_int                  order,                                  /* I    Max lag for correlation                                                     */
    const opus_int                  head_room,                              /* I    Desired headroom                                                            */
    opus_int32                      *XX,                                    /* O    Pointer to X'*X correlation matrix [ order x order ]                        */
    opus_int                        *rshifts,                               /* I/O  Right shifts of correlations                                                */
    int                              arch                                   /* I    Run-time architecture                                                       */
);

/* Calculates correlation vector X'*t */
void silk_corrVector_FIX(
    const opus_int16                *x,                                     /* I    x vector [L + order - 1] used to form data matrix X                         */
    const opus_int16                *t,                                     /* I    Target vector [L]                                                           */
    const opus_int                  L,                                      /* I    Length of vectors                                                           */
    const opus_int                  order,                                  /* I    Max lag for correlation                                                     */
    opus_int32                      *Xt,                                    /* O    Pointer to X'*t correlation vector [order]                                  */
    const opus_int                  rshifts,                                /* I    Right shifts of correlations                                                */
    int                             arch                                    /* I    Run-time architecture                                                       */
);

/* Add noise to matrix diagonal */
void silk_regularize_correlations_FIX(
    opus_int32                      *XX,                                    /* I/O  Correlation matrices                                                        */
    opus_int32                      *xx,                                    /* I/O  Correlation values                                                          */
    opus_int32                      noise,                                  /* I    Noise to add                                                                */
    opus_int                        D                                       /* I    Dimension of XX                                                             */
);

/* Solves Ax = b, assuming A is symmetric */
void silk_solve_LDL_FIX(
    opus_int32                      *A,                                     /* I    Pointer to symetric square matrix A                                         */
    opus_int                        M,                                      /* I    Size of matrix                                                              */
    const opus_int32                *b,                                     /* I    Pointer to b vector                                                         */
    opus_int32                      *x_Q16                                  /* O    Pointer to x solution vector                                                */
);

#ifndef FORCE_CPP_BUILD
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* FORCE_CPP_BUILD */
#endif /* SILK_MAIN_FIX_H */