Inlines.h | Explore in Territory

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/*! \file silk_Inlines.h
 *  \brief silk_Inlines.h defines OPUS_INLINE signal processing functions.
 */

#ifndef SILK_FIX_INLINES_H
#define SILK_FIX_INLINES_H

#ifdef  __cplusplus
extern "C"
{
#endif

/* count leading zeros of opus_int64 */
static OPUS_INLINE opus_int32 silk_CLZ64( opus_int64 in )
{ … }

/* get number of leading zeros and fractional part (the bits right after the leading one */
static OPUS_INLINE void silk_CLZ_FRAC(
    opus_int32 in,            /* I  input                               */
    opus_int32 *lz,           /* O  number of leading zeros             */
    opus_int32 *frac_Q7       /* O  the 7 bits right after the leading one */
)
{ … }

/* Approximation of square root                                          */
/* Accuracy: < +/- 10%  for output values > 15                           */
/*           < +/- 2.5% for output values > 120                          */
static OPUS_INLINE opus_int32 silk_SQRT_APPROX( opus_int32 x )
{ … }

/* Divide two int32 values and return result as int32 in a given Q-domain */
static OPUS_INLINE opus_int32 silk_DIV32_varQ(   /* O    returns a good approximation of "(a32 << Qres) / b32" */
    const opus_int32     a32,               /* I    numerator (Q0)                  */
    const opus_int32     b32,               /* I    denominator (Q0)                */
    const opus_int       Qres               /* I    Q-domain of result (>= 0)       */
)
{ … }

/* Invert int32 value and return result as int32 in a given Q-domain */
static OPUS_INLINE opus_int32 silk_INVERSE32_varQ(   /* O    returns a good approximation of "(1 << Qres) / b32" */
    const opus_int32     b32,                   /* I    denominator (Q0)                */
    const opus_int       Qres                   /* I    Q-domain of result (> 0)        */
)
{ … }

#ifdef  __cplusplus
}
#endif

#endif /* SILK_FIX_INLINES_H */
chromium/third_party/opus/src/silk/Inlines.h
