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Add support for s16 format to biquad and low-pass filters.

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This commit is contained in:
David Reid
2020-01-18 17:23:36 +10:00
parent 705e54c69a
commit 7b27cda74a
1 changed files with 21 additions and 23 deletions
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research/ma_lpf.h
+21 -23
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@@ -18,29 +18,6 @@ typedef struct
double b0;
double b1;
double b2;
#if 0
union
{
struct
{
double a0;
double a1;
double a2;
double b0;
double b1;
double b2;
} f32;
struct
{
ma_int32 a0;
ma_int32 a1;
ma_int32 a2;
ma_int32 b0;
ma_int32 b1;
ma_int32 b2;
} s16;
} constants;
#endif
} ma_biquad_config;
ma_biquad_config ma_biquad_config_init(ma_format format, ma_uint32 channels, double a0, double a1, double a2, double b0, double b1, double b2);
@@ -187,7 +164,28 @@ ma_result ma_biquad_process(ma_biquad* pBQ, void* pFramesOut, const void* pFrame
pBQ->y1[c] = (float)y0;
}
}
} else if (pBQ->config.format == ma_format_s16) {
/* */ ma_int16* pY = ( ma_int16*)pFramesOut;
const ma_int16* pX = (const ma_int16*)pFramesIn;
for (n = 0; n < frameCount; n += 1) {
for (c = 0; c < pBQ->config.channels; c += 1) {
double x2 = pBQ->x2[c];
double x1 = pBQ->x1[c];
double x0 = pX[n*pBQ->config.channels + 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[n*pBQ->config.channels + 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;
}
}
} else {
MA_ASSERT(MA_FALSE);
return MA_INVALID_ARGS; /* Format not supported. Should never hit this because it's checked in ma_biquad_init(). */
}