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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -195,4 +195,6 @@ Cargo.lock | |
| !.yarn/versions | ||
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| *.node | ||
| dev/ | ||
| dev/ | ||
| ./src/dasp/* | ||
| ./src/decoder/* | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| use super::*; | ||
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| #[napi(object)] | ||
| pub struct EqualizerCoefficient { | ||
| pub beta: i32, | ||
| pub alpha: i32, | ||
| pub gamma: i32, | ||
| } | ||
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| #[napi] | ||
| pub struct Equalizer { | ||
| coefficients: Vec<EqualizerCoefficient>, | ||
| format: PCMFormat, | ||
| channels: AudioChannel, | ||
| } | ||
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| #[napi] | ||
| impl Equalizer { | ||
| #[napi(constructor)] | ||
| pub fn new() -> Self { | ||
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| } | ||
| } |
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| use napi::bindgen_prelude::*; | ||
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| #[napi] | ||
| pub enum PCMFormat { | ||
| S16LE, | ||
| S16BE, | ||
| S32LE, | ||
| S32BE, | ||
| } | ||
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| #[napi] | ||
| pub enum AudioChannel { | ||
| Mono, | ||
| Stereo, | ||
| } | ||
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| mod equalizer; | ||
| mod volume; |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,165 @@ | ||
| use super::*; | ||
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| #[napi] | ||
| pub struct VolumeTransformer { | ||
| volume: i32, | ||
| format: PCMFormat, | ||
| channels: AudioChannel, | ||
| } | ||
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| // TODO: investigate SIMD optimizations | ||
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| #[napi] | ||
| impl VolumeTransformer { | ||
| #[napi(constructor)] | ||
| pub fn new(volume: i32, format: PCMFormat, channels: AudioChannel) -> Self { | ||
| Self { | ||
| volume, | ||
| format, | ||
| channels, | ||
| } | ||
| } | ||
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| #[napi(setter)] | ||
| pub fn set_volume(&mut self, volume: i32) { | ||
| if volume < 0 { | ||
| self.volume = 0; | ||
| } else { | ||
| self.volume = volume; | ||
| } | ||
| } | ||
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| #[napi(getter)] | ||
| pub fn get_volume(&self) -> i32 { | ||
| self.volume | ||
| } | ||
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| #[napi(setter)] | ||
| pub fn set_format(&mut self, format: PCMFormat) { | ||
| self.format = format; | ||
| } | ||
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| #[napi(getter)] | ||
| pub fn get_format(&self) -> PCMFormat { | ||
| self.format | ||
| } | ||
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| #[napi(setter)] | ||
| pub fn set_channels(&mut self, channels: AudioChannel) { | ||
| self.channels = channels; | ||
| } | ||
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| #[napi(getter)] | ||
| pub fn get_channels(&self) -> AudioChannel { | ||
| self.channels | ||
| } | ||
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| #[napi] | ||
| pub fn process(&self, input: Buffer) -> Buffer { | ||
| // avoid computation if volume is 1, aka default volume | ||
| if self.volume == 1 { | ||
| return input; | ||
| } | ||
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| match self.channels { | ||
| AudioChannel::Mono => self.process_mono_inner(input), | ||
| AudioChannel::Stereo => self.process_stereo_inner(input), | ||
| } | ||
| } | ||
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| fn process_stereo_inner(&self, input: Buffer) -> Buffer { | ||
| match self.format { | ||
| PCMFormat::S16LE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(4) { | ||
| let mut sample = i16::from_le_bytes([input[i], input[i + 1]]); | ||
| sample = (sample as i32 * self.volume) as i16; | ||
| output.extend_from_slice(&sample.to_le_bytes()); | ||
| let mut sample = i16::from_le_bytes([input[i + 2], input[i + 3]]); | ||
| sample = (sample as i32 * self.volume) as i16; | ||
| output.extend_from_slice(&sample.to_le_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| PCMFormat::S16BE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(4) { | ||
| let mut sample = i16::from_be_bytes([input[i], input[i + 1]]); | ||
| sample = (sample as i32 * self.volume) as i16; | ||
| output.extend_from_slice(&sample.to_be_bytes()); | ||
| let mut sample = i16::from_be_bytes([input[i + 2], input[i + 3]]); | ||
| sample = (sample as i32 * self.volume) as i16; | ||
| output.extend_from_slice(&sample.to_be_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| PCMFormat::S32LE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(8) { | ||
| let mut sample = i32::from_le_bytes([input[i], input[i + 1], input[i + 2], input[i + 3]]); | ||
| sample = (sample as i32 * self.volume) as i32; | ||
| output.extend_from_slice(&sample.to_le_bytes()); | ||
| let mut sample = | ||
| i32::from_le_bytes([input[i + 4], input[i + 5], input[i + 6], input[i + 7]]); | ||
| sample = (sample as i32 * self.volume) as i32; | ||
| output.extend_from_slice(&sample.to_le_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| PCMFormat::S32BE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(8) { | ||
| let mut sample = i32::from_be_bytes([input[i], input[i + 1], input[i + 2], input[i + 3]]); | ||
| sample = (sample as i32 * self.volume) as i32; | ||
| output.extend_from_slice(&sample.to_be_bytes()); | ||
| let mut sample = | ||
| i32::from_be_bytes([input[i + 4], input[i + 5], input[i + 6], input[i + 7]]); | ||
| sample = (sample as i32 * self.volume) as i32; | ||
| output.extend_from_slice(&sample.to_be_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| } | ||
| } | ||
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| fn process_mono_inner(&self, input: Buffer) -> Buffer { | ||
| match self.format { | ||
| PCMFormat::S16LE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(2) { | ||
| let mut sample = i16::from_le_bytes([input[i], input[i + 1]]); | ||
| sample = (sample as i32 * self.volume) as i16; | ||
| output.extend_from_slice(&sample.to_le_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| PCMFormat::S16BE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(2) { | ||
| let mut sample = i16::from_be_bytes([input[i], input[i + 1]]); | ||
| sample = (sample as i32 * self.volume) as i16; | ||
| output.extend_from_slice(&sample.to_be_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| PCMFormat::S32LE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(4) { | ||
| let mut sample = i32::from_le_bytes([input[i], input[i + 1], input[i + 2], input[i + 3]]); | ||
| sample = (sample as i32 * self.volume) as i32; | ||
| output.extend_from_slice(&sample.to_le_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| PCMFormat::S32BE => { | ||
| let mut output = Vec::with_capacity(input.len()); | ||
| for i in (0..input.len()).step_by(4) { | ||
| let mut sample = i32::from_be_bytes([input[i], input[i + 1], input[i + 2], input[i + 3]]); | ||
| sample = (sample as i32 * self.volume) as i32; | ||
| output.extend_from_slice(&sample.to_be_bytes()); | ||
| } | ||
| output.into() | ||
| } | ||
| } | ||
| } | ||
| } |
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