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Use db_to_gain_fast() in plugins

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This commit is contained in:
Robbert van der Helm 2023-01-04 17:05:05 +01:00
parent 3b57ebe895
commit 11d9476a5f
3 changed files with 10 additions and 9 deletions
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2
plugins/examples/sine/src/lib.rs
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@ -187,7 +187,7 @@ impl Plugin for Sine {
};
for sample in channel_samples {
*sample = sine * util::db_to_gain(gain);
*sample = sine * util::db_to_gain_fast(gain);
}
}

12
plugins/spectral_compressor/src/compressor_bank.rs
View file

@ -881,9 +881,9 @@ impl CompressorBank {
// This threshold must never reach zero as it's used in divisions to get a gain ratio
// above the threshold
*threshold = util::db_to_gain(threshold_db).max(f32::EPSILON);
*knee_start = util::db_to_gain(knee_start_db).max(f32::EPSILON);
*knee_end = util::db_to_gain(knee_end_db).max(f32::EPSILON);
*threshold = util::db_to_gain_fast(threshold_db);
*knee_start = util::db_to_gain_fast(knee_start_db);
*knee_end = util::db_to_gain_fast(knee_end_db);
}
}
@ -910,9 +910,9 @@ impl CompressorBank {
let knee_end_db =
threshold_db + (params.compressors.upwards.knee_width_db.value() / 2.0);
*threshold = util::db_to_gain(threshold_db).max(f32::EPSILON);
*knee_start = util::db_to_gain(knee_start_db).max(f32::EPSILON);
*knee_end = util::db_to_gain(knee_end_db).max(f32::EPSILON);
*threshold = util::db_to_gain_fast(threshold_db);
*knee_start = util::db_to_gain_fast(knee_start_db);
*knee_end = util::db_to_gain_fast(knee_end_db);
}
}

5
src/util.rs
View file

@ -43,8 +43,9 @@ pub fn gain_to_db(gain: f32) -> f32 {
}
/// An approximation of [`db_to_gain()`] using `exp()`. Does not treat values below
/// [`MINUS_INFINITY_DB`] as 0.0 gain to avoid branching. Will run faster on most architectures, but
/// the result may be slightly different.
/// [`MINUS_INFINITY_DB`] as 0.0 gain to avoid branching. As a result this function will thus also
/// never return 0.0 for normal input values. Will run faster on most architectures, but the result
/// may be slightly different.
#[inline]
pub fn db_to_gain_fast(dbs: f32) -> f32 {
const CONVERSION_FACTOR: f32 = std::f32::consts::LN_10 / 20.0;