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feat: live operating-point fill + -6 dB refs on the gain curve

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Add a per-channel input_level meter (post pre-gain, peak-with-decay) and use it
to shade the gain curve: a translucent fill under the curve from the floor up to
the current input, its right edge riding the curve (width = input, height =
output), plus a dot at the operating point. Add -6 dBFS reference lines on both
axes with a tick label.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Mikkeli Matlock
2026-06-26 21:19:16 +09:00
parent 45735f71f7
commit abc9ea8b4f
4 changed files with 55 additions and 7 deletions
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src/lib.rs
+4
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@@ -211,6 +211,7 @@ impl Plugin for Codename206 {
let num_samples = buffer.samples();
let mut lvl_l = [0.0f32; meters::NUM_CHANNELS];
let mut lvl_r = [0.0f32; meters::NUM_CHANNELS];
let mut inp = [0.0f32; meters::NUM_CHANNELS]; // mono input level (detector / gain-curve x)
let mut gr = [0.0f32; meters::NUM_CHANNELS];
let mut lim_gr = 0.0f32;
@@ -257,6 +258,7 @@ impl Plugin for Codename206 {
let out_r = band_out[b][r].abs();
// Wet gain reduction (what the comp computes), independent of the mix.
let g = self.comps[b].gain_reduction_db();
inp[b] = inp[b].max(in_mono);
lvl_l[b] = lvl_l[b].max(out_l);
lvl_r[b] = lvl_r[b].max(out_r);
gr[b] = gr[b].max(g);
@@ -287,6 +289,7 @@ impl Plugin for Codename206 {
let out_l = out_frame[0].abs();
let out_r = out_frame[r].abs();
let g = self.comps[ALL].gain_reduction_db();
inp[ALL] = inp[ALL].max(in_mono);
lvl_l[ALL] = lvl_l[ALL].max(out_l);
lvl_r[ALL] = lvl_r[ALL].max(out_r);
gr[ALL] = gr[ALL].max(g);
@@ -327,6 +330,7 @@ impl Plugin for Codename206 {
for i in 0..meters::NUM_CHANNELS {
meters::decay_store(&self.meters.level_l[i], lvl_l[i], w);
meters::decay_store(&self.meters.level_r[i], lvl_r[i], w);
meters::decay_store(&self.meters.input_level[i], inp[i], w);
meters::decay_store(&self.meters.gain_reduction_db[i], gr[i], w);
}
meters::decay_store(&self.meters.limiter_gr_db, lim_gr, w);