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| author | Paul B Mahol <onemda@gmail.com> | 2020-11-30 14:20:45 +0100 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2020-11-30 14:53:14 +0100 |
| commit | ca0900bc6ef1db42881769528f2a3bb69e0bc492 (patch) | |
| tree | 6a10318957e30f333e797a6c90470e3077fe8619 /libavfilter/af_acrossover.c | |
| parent | 6100a01a7ad939d8069b011a29eb8db90aa68aba (diff) | |
| download | ffmpeg-ca0900bc6ef1db42881769528f2a3bb69e0bc492.tar.gz | |
avfilter/af_acrossover: unroll biquad_process loop
Makes code significantly faster for higher orders.
Diffstat (limited to 'libavfilter/af_acrossover.c')
| -rw-r--r-- | libavfilter/af_acrossover.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/libavfilter/af_acrossover.c b/libavfilter/af_acrossover.c index 7788251d3a..6150af7933 100644 --- a/libavfilter/af_acrossover.c +++ b/libavfilter/af_acrossover.c @@ -288,7 +288,25 @@ static void biquad_process_## name(const BiquadCoeffs *const c,\ type z1 = b->z1; \ type z2 = b->z2; \ \ - for (int n = 0; n < nb_samples; n++) { \ + for (int n = 0; n + 1 < nb_samples; n++) { \ + type in = src[n]; \ + type out; \ + \ + out = in * b0 + z1; \ + z1 = b1 * in + z2 + a1 * out; \ + z2 = b2 * in + a2 * out; \ + dst[n] = out; \ + \ + n++; \ + in = src[n]; \ + out = in * b0 + z1; \ + z1 = b1 * in + z2 + a1 * out; \ + z2 = b2 * in + a2 * out; \ + dst[n] = out; \ + } \ + \ + if (nb_samples & 1) { \ + const int n = nb_samples - 1; \ const type in = src[n]; \ type out; \ \ |