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78f38416b4
The noise gate and compressor both had the same envelope code, and I'm looking at some more users, so let's just abstract it out and make it more legible in the process. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
// NAME: Noise Gate [GATE]
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// PRIORITY: 10
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// POT: "Level" LINEAR(-100.0 -40.0) = -70.0 dB
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// POT: "Attack" LINEAR(0.0 10.0) = 1.5 ms
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// POT: "Release" LINEAR(50.0 500.0) = 150.0 ms
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//
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// Noise Gate
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//
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// Same envelope calculations as the compressor. I wonder if
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// I should just have a combined noise gate / compressor thing?
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//
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// But the attack/release values are probably different.
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//
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static struct {
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struct envelope envelope;
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float mult, level;
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} gate;
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static inline void gate_init(unsigned char pot[10])
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{
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float level_db = gate_pot0(pot[0]);
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gate.level = db_to_level(level_db);
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float attack_ms = gate_pot1(pot[1]);
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float release_ms = gate_pot2(pot[2]);
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envelope_init(&gate.envelope, attack_ms, release_ms);
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}
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static inline float gate_step(float in)
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{
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float env = envelope_step(&gate.envelope, in);
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float mult = gate.mult;
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// Ramp up fairly quickly, ramp down slowly
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if (env >= gate.level) {
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mult = linear(0.01f, mult, 1.0f);
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if (mult > 0.99f)
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mult = 1.0f;
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} else {
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mult = linear(0.001f, mult, 0.0f);
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if (mult < 0.01f)
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mult = 0.0f;
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gate_effect.intense = 1;
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}
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gate.mult = mult;
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return in * mult;
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}
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