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| author | Paul B Mahol <onemda@gmail.com> | 2020-10-16 22:51:16 +0200 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2020-10-16 23:07:27 +0200 |
| commit | e704750a9f51b4d3fd9a334da75d781e18a9e00c (patch) | |
| tree | a3aae5bf01377fde53acd49a8fac814fc7c53c63 /libavfilter/af_aiir.c | |
| parent | 0df0e12d025bf98e5869dc5716e296d0768bccd7 (diff) | |
| download | ffmpeg-e704750a9f51b4d3fd9a334da75d781e18a9e00c.tar.gz | |
avfilter/af_aiir: use transposed II form for biquad sections
Diffstat (limited to 'libavfilter/af_aiir.c')
| -rw-r--r-- | libavfilter/af_aiir.c | 48 |
1 files changed, 18 insertions, 30 deletions
diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c index 4b6e867819..8900b0a7c4 100644 --- a/libavfilter/af_aiir.c +++ b/libavfilter/af_aiir.c @@ -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++) { \ |