chromium/third_party/opus/src/silk/float/residual_energy_FLP.c

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "main_FLP.h"

#define MAX_ITERATIONS_RESIDUAL_NRG …
#define REGULARIZATION_FACTOR …

/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
silk_float silk_residual_energy_covar_FLP(                              /* O    Weighted residual energy                    */
    const silk_float                *c,                                 /* I    Filter coefficients                         */
    silk_float                      *wXX,                               /* I/O  Weighted correlation matrix, reg. out       */
    const silk_float                *wXx,                               /* I    Weighted correlation vector                 */
    const silk_float                wxx,                                /* I    Weighted correlation value                  */
    const opus_int                  D                                   /* I    Dimension                                   */
)
{ … }

/* Calculates residual energies of input subframes where all subframes have LPC_order   */
/* of preceding samples                                                                 */
void silk_residual_energy_FLP(
    silk_float                      nrgs[ MAX_NB_SUBFR ],               /* O    Residual energy per subframe                */
    const silk_float                x[],                                /* I    Input signal                                */
    silk_float                      a[ 2 ][ MAX_LPC_ORDER ],            /* I    AR coefs for each frame half                */
    const silk_float                gains[],                            /* 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                                   */
)
{ … }