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avfilter/af_aiir: use transposed II form for biquad sections

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This commit is contained in:
Paul B Mahol 2020-10-16 22:51:16 +02:00
parent 0df0e12d02
commit e704750a9f
1 changed files with 18 additions and 30 deletions
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48
libavfilter/af_aiir.c
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@ -40,8 +40,7 @@ typedef struct Pair {
typedef struct BiquadContext {
double a[3];
double b[3];
double i1, i2;
double o1, o2;
double w1, w2;
} BiquadContext;
typedef struct IIRChannel {
@ -177,8 +176,9 @@ IIR_CH(s32p, int32_t, INT32_MIN, INT32_MAX, 1)
IIR_CH(fltp, float, -1., 1., 0)
IIR_CH(dblp, double, -1., 1., 0)
#define SERIAL_IIR_CH(name, type, min, max, need_clipping) \
static int iir_ch_serial_## name(AVFilterContext *ctx, void *arg, int ch, int nb_jobs) \
#define SERIAL_IIR_CH(name, type, min, max, need_clipping) \
static int iir_ch_serial_## name(AVFilterContext *ctx, void *arg, \
int ch, int nb_jobs) \
{ \
AudioIIRContext *s = ctx->priv; \
const double ig = s->dry_gain; \
@ -201,19 +201,15 @@ static int iir_ch_serial_## name(AVFilterContext *ctx, void *arg, int ch, int nb
const double b0 = iir->biquads[i].b[0]; \
const double b1 = iir->biquads[i].b[1]; \
const double b2 = iir->biquads[i].b[2]; \
double i1 = iir->biquads[i].i1; \
double i2 = iir->biquads[i].i2; \
double o1 = iir->biquads[i].o1; \
double o2 = iir->biquads[i].o2; \
double w1 = iir->biquads[i].w1; \
double w2 = iir->biquads[i].w2; \
\
for (n = 0; n < in->nb_samples; n++) { \
double i0 = ig * (i ? dst[n] : src[n]); \
double o0 = i0 * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \
double o0 = i0 * b0 + w1; \
\
i2 = i1; \
i1 = i0; \
o2 = o1; \
o1 = o0; \
w1 = b1 * i0 + w2 + a1 * o0; \
w2 = b2 * i0 + a2 * o0; \
o0 *= og * g; \
\
o0 = o0 * mix + imix * i0; \
@ -227,10 +223,8 @@ static int iir_ch_serial_## name(AVFilterContext *ctx, void *arg, int ch, int nb
dst[n] = o0; \
} \
} \
iir->biquads[i].i1 = i1; \
iir->biquads[i].i2 = i2; \
iir->biquads[i].o1 = o1; \
iir->biquads[i].o2 = o2; \
iir->biquads[i].w1 = w1; \
iir->biquads[i].w2 = w2; \
} \
\
return 0; \
@ -266,19 +260,15 @@ static int iir_ch_parallel_## name(AVFilterContext *ctx, void *arg, \
const double a2 = -iir->biquads[i].a[2]; \
const double b1 = iir->biquads[i].b[1]; \
const double b2 = iir->biquads[i].b[2]; \
double i1 = iir->biquads[i].i1; \
double i2 = iir->biquads[i].i2; \
double o1 = iir->biquads[i].o1; \
double o2 = iir->biquads[i].o2; \
double w1 = iir->biquads[i].w1; \
double w2 = iir->biquads[i].w2; \
\
for (n = 0; n < in->nb_samples; n++) { \
double i0 = ig * src[n]; \
double o0 = i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \
double o0 = w1; \
\
i2 = i1; \
i1 = i0; \
o2 = o1; \
o1 = o0; \
w1 = b1 * i0 + w2 + a1 * o0; \
w2 = b2 * i0 + a2 * o0; \
o0 *= og * g; \
o0 += dst[n]; \
\
@ -292,10 +282,8 @@ static int iir_ch_parallel_## name(AVFilterContext *ctx, void *arg, \
dst[n] = o0; \
} \
} \
iir->biquads[i].i1 = i1; \
iir->biquads[i].i2 = i2; \
iir->biquads[i].o1 = o1; \
iir->biquads[i].o2 = o2; \
iir->biquads[i].w1 = w1; \
iir->biquads[i].w2 = w2; \
} \
\
for (n = 0; n < in->nb_samples; n++) { \