#### RemiAudio
#### Copyright (C) 2022-2024 Remilia Scarlet <remilia@posteo.jp>
####
#### This program is free software: you can redistribute it and/or modify it
#### under the terms of the GNU Affero General Public License as published by
#### the Free Software Foundation, either version 3 of the License, or (at your
#### option) any later version.
####
#### This program is distributed in the hope that it will be useful, but WITHOUT
#### ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#### FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
#### License for more details.
####
#### You should have received a copy of the GNU Affero General Public License
#### along with this program. If not, see <https://www.gnu.org/licenses/>.
module RemiAudio::DSP::StereoEnhancer
# Applies a stereo enhancement effect to the audio blocks. The coeff
# parameter defines how much widening (or narrowing) to apply. 0.5 is
# neutral, 0.0 mono-fies it, and values above 0.5 widen the sound. The
# expected range is 0.0 to 1.5.
@[AlwaysInline]
def self.process(blockLeft : Array(Float64)|Slice(Float64), blockRight : Array(Float64)|Slice(Float64),
coeff : Float64) : Nil
sampleL : Float64 = 0.0
sampleR : Float64 = 0.0
adjust : Float64 = 0.0
stereo : Float64 = 0.0
blockLeft.size.times do |i|
sampleL = blockLeft[i]
sampleR = blockRight[i]
adjust = (sampleL + sampleR) * 0.5
stereo = (sampleL - sampleR) * coeff
blockLeft[i] = adjust + stereo
blockRight[i] = adjust - stereo
end
end
# Applies a stereo enhancement effect to the audio blocks. The coeff
# parameter defines how much widening (or narrowing) to apply. 0.5 is
# neutral, 0.0 mono-fies it, and values above 0.5 widen the sound. The
# expected range is 0.0 to 1.5.
@[AlwaysInline]
def self.process(blockLeft : Array(Float32)|Slice(Float32), blockRight : Array(Float32)|Slice(Float32),
coeff : Float64) : Nil
sampleL : Float32 = 0.0
sampleR : Float32 = 0.0
adjust : Float64 = 0.0
stereo : Float64 = 0.0
blockLeft.size.times do |i|
sampleL = blockLeft[i]
sampleR = blockRight[i]
adjust = (sampleL + sampleR) * 0.5
stereo = (sampleL - sampleR) * coeff
blockLeft[i] = (adjust + stereo).to_f32!
blockRight[i] = (adjust - stereo).to_f32!
end
end
# Applies a stereo enhancement effect to the interleaved audio
# block. The coeff parameter defines how much widening (or
# narrowing) to apply. 0.5 is neutral, 0.0 mono-fies it, and values
# above 0.5 widen the sound. The expected range is 0.0 to 1.5.
@[AlwaysInline]
def self.process(block : Array(Float64)|Slice(Float64), coeff : Float64) : Nil
sampleL : Float64 = 0.0
sampleR : Float64 = 0.0
adjust : Float64 = 0.0
stereo : Float64 = 0.0
pos : Int32 = 0
while pos < block.size
sampleL = block[pos]
sampleR = block[pos + 1]
adjust = (sampleL + sampleR) * 0.5
stereo = (sampleL - sampleR) * coeff
block[pos] = adjust + stereo
block[pos + 1] = adjust - stereo
pos += 2
end
end
# Applies a stereo enhancement effect to the interleaved audio
# block. The coeff parameter defines how much widening (or
# narrowing) to apply. 0.5 is neutral, 0.0 mono-fies it, and values
# above 0.5 widen the sound. The expected range is 0.0 to 1.5.
@[AlwaysInline]
def self.process(block : Array(Float32)|Slice(Float32), coeff : Float64) : Nil
sampleL : Float64 = 0.0
sampleR : Float64 = 0.0
adjust : Float64 = 0.0
stereo : Float64 = 0.0
pos : Int32 = 0
while pos < block.size
sampleL = block[pos].to_f64!
sampleR = block[pos + 1].to_f64!
adjust = (sampleL + sampleR) * 0.5
stereo = (sampleL - sampleR) * coeff
block[pos] = (adjust + stereo).to_f32!
block[pos + 1] = (adjust - stereo).to_f32!
pos += 2
end
end
end