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Remove the old direct form 1 biquad code.

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This commit is contained in:
David Reid
2020-01-28 21:19:14 +10:00
parent 8a44789840
commit b97c6fd35b
1 changed files with 0 additions and 54 deletions
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research/ma_lpf.h
-54
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@@ -163,33 +163,6 @@ ma_result ma_biquad_reinit(const ma_biquad_config* pConfig, ma_biquad* pBQ)
return MA_SUCCESS; return MA_SUCCESS;
} }
#if 0
static MA_INLINE void ma_biquad_process_pcm_frame_f32__direct_form_1(ma_biquad* pBQ, float* pY, const float* pX)
{
ma_uint32 c;
const double a1 = pBQ->config.a1;
const double a2 = pBQ->config.a2;
const double b0 = pBQ->config.b0;
const double b1 = pBQ->config.b1;
const double b2 = pBQ->config.b2;
for (c = 0; c < pBQ->config.channels; c += 1) {
double x2 = pBQ->x2[c];
double x1 = pBQ->x1[c];
double x0 = pX[c];
double y2 = pBQ->y2[c];
double y1 = pBQ->y1[c];
double y0 = b0*x0 + b1*x1 + b2*x2 - a1*y1 - a2*y2;
pY[c] = (float)y0;
pBQ->x2[c] = (float)x1;
pBQ->x1[c] = (float)x0;
pBQ->y2[c] = (float)y1;
pBQ->y1[c] = (float)y0;
}
}
#endif
static MA_INLINE void ma_biquad_process_pcm_frame_f32__direct_form_2_transposed(ma_biquad* pBQ, float* pY, const float* pX) static MA_INLINE void ma_biquad_process_pcm_frame_f32__direct_form_2_transposed(ma_biquad* pBQ, float* pY, const float* pX)
{ {
ma_uint32 c; ma_uint32 c;
@@ -215,33 +188,6 @@ static MA_INLINE void ma_biquad_process_pcm_frame_f32__direct_form_2_transposed(
} }
} }
#if 0
static MA_INLINE void ma_biquad_process_pcm_frame_s16__direct_form_1(ma_biquad* pBQ, ma_int16* pY, const ma_int16* pX)
{
ma_uint32 c;
const double a1 = pBQ->config.a1;
const double a2 = pBQ->config.a2;
const double b0 = pBQ->config.b0;
const double b1 = pBQ->config.b1;
const double b2 = pBQ->config.b2;
for (c = 0; c < pBQ->config.channels; c += 1) {
double x2 = pBQ->x2[c];
double x1 = pBQ->x1[c];
double x0 = pX[c] * 0.000030517578125; /* s16 -> f32 */
double y2 = pBQ->y2[c];
double y1 = pBQ->y1[c];
double y0 = b0*x0 + b1*x1 + b2*x2 - a1*y1 - a2*y2;
pY[c] = (ma_int16)(y0 * 32767.0); /* f32 -> s16 */
pBQ->x2[c] = (float)x1;
pBQ->x1[c] = (float)x0;
pBQ->y2[c] = (float)y1;
pBQ->y1[c] = (float)y0;
}
}
#endif
static MA_INLINE void ma_biquad_process_pcm_frame_s16__direct_form_2_transposed(ma_biquad* pBQ, ma_int16* pY, const ma_int16* pX) static MA_INLINE void ma_biquad_process_pcm_frame_s16__direct_form_2_transposed(ma_biquad* pBQ, ma_int16* pY, const ma_int16* pX)
{ {
ma_uint32 c; ma_uint32 c;