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Update the amp example to use in place processing. #114

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Update the amp example to use in place processing. #114

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2 changes: 0 additions & 2 deletions docs/amp/eg-amp-rs.lv2/amp.ttl
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,6 @@
# Every plugin must have a name, described with the doap:name property.
doap:name "Simple Amplifier (Rust Version)" ;
doap:license <http://opensource.org/licenses/isc> ;
# This tells the host that this plugin can not work "in-place"; The input and output buffers may not be the same. This plugin could technically work "in-place", but it would mean that the plugin would receive a mutable and an immutable reference to the same place in memory, which obviously isn't allowed in Rust.
lv2:requiredFeature lv2:inPlaceBroken ;
lv2:optionalFeature lv2:hardRTCapable ;
lv2:port [
# Every port must have at least two types, one that specifies direction
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13 changes: 7 additions & 6 deletions docs/amp/src/lib.rs
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Expand Up @@ -3,9 +3,9 @@ use lv2::prelude::*;
// Most useful plugins will have ports for input and output data. In code, these ports are represented by a struct implementing the `PortCollection` trait. Internally, ports are referred to by index. These indices are assigned in ascending order, starting with 0 for the first port. The indices in `amp.ttl` have to match them.
#[derive(PortCollection)]
struct Ports {
gain: InputPort<Control>,
input: InputPort<Audio>,
output: OutputPort<Audio>,
gain: InputPort<InPlaceControl>,
input: InputPort<InPlaceAudio>,
output: OutputPort<InPlaceAudio>,
}
// Every plugin defines a struct for the plugin instance. All persistent data associated with a plugin instance is stored here, and is available to every instance method. In this simple plugin, there is no additional instance data and therefore, this struct is empty.
//
Expand All @@ -24,14 +24,15 @@ impl Plugin for Amp {
}
// The `run()` method is the main process function of the plugin. It processes a block of audio in the audio context. Since this plugin is `lv2:hardRTCapable`, `run()` must be real-time safe, so blocking (e.g. with a mutex) or memory allocation are not allowed.
fn run(&mut self, ports: &mut Ports, _features: &mut (), _: u32) {
let coef = if *(ports.gain) > -90.0 {
10.0_f32.powf(*(ports.gain) * 0.05)
let gain = ports.gain.get();
let coef = if gain > -90.0 {
10.0_f32.powf(gain * 0.05)
} else {
0.0
};

for (in_frame, out_frame) in Iterator::zip(ports.input.iter(), ports.output.iter_mut()) {
*out_frame = in_frame * coef;
out_frame.set(in_frame.get() * coef);
}
}
}
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