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bw_src(_int) don't need bw_math + use natural ratio in bw_src

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This commit is contained in:
Stefano D'Angelo 2023-03-23 15:12:10 +01:00
parent 8c9796f025
commit fb4d041838
2 changed files with 4 additions and 8 deletions
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8
include/bw_src.h
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@ -21,7 +21,7 @@
/*!
* module_type {{{ dsp }}}
* version {{{ 0.4.0 }}}
* requires {{{ bw_config bw_common bw_math }}}
* requires {{{ bw_config bw_common }}}
* description {{{
* Aribtrary-ratio IIR sample rate converter.
* }}}
@ -83,8 +83,6 @@ static inline void bw_src_process(const bw_src_coeffs *BW_RESTRICT coeffs, bw_sr
/* WARNING: This part of the file is not part of the public API. Its content may
* change at any time in future versions. Please, do not use it directly. */
#include <bw_math.h>
struct _bw_src_coeffs {
float k;
float a1;
@ -110,9 +108,9 @@ struct _bw_src_state {
};
static inline void bw_src_init(bw_src_coeffs *BW_RESTRICT coeffs, float ratio) {
coeffs->k = ratio >= 0.f ? 1.f / ratio : ratio;
coeffs->k = ratio >= 1.f ? 1.f / ratio : -1.f / ratio;
// TODO: better filter, perhaps optimzied coefficients
ratio = bw_absf(ratio);
ratio = ratio >= 1.f ? ratio : -coeffs->k;
coeffs->a1 = (12.56637061435917f - 8.f * ratio) / (2.f * ratio + 3.141592653589793f);
coeffs->a2 = (ratio * (24.f * ratio - 75.39822368615503f) + 59.21762640653615f) / (ratio * (4.f * ratio + 12.56637061435917f) + 9.869604401089358f);
coeffs->a3 = (ratio * ((150.7964473723101f - 32.f * ratio) * ratio - 236.8705056261446f) + 124.0251067211993f) / (ratio * (ratio * (8.f * ratio + 37.69911184307752f) + 59.21762640653615f) + 31.00627668029982f);

4
include/bw_src_int.h
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@ -21,7 +21,7 @@
/*!
* module_type {{{ dsp }}}
* version {{{ 0.4.0 }}}
* requires {{{ bw_config bw_common bw_math }}}
* requires {{{ bw_config bw_common }}}
* description {{{
* Integer-ratio IIR sample rate converter.
*
@ -89,8 +89,6 @@ static inline int bw_src_int_process(const bw_src_int_coeffs *BW_RESTRICT coeffs
/* WARNING: This part of the file is not part of the public API. Its content may
* change at any time in future versions. Please, do not use it directly. */
#include <bw_math.h>
struct _bw_src_int_coeffs {
int ratio;
float a1;