fundsp 0.23.0

Audio processing and synthesis library.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

//! Real-time friendly backend for Net.

use super::audiounit::*;
use super::buffer::*;
use super::math::*;
use super::net::*;
use super::setting::*;
use super::signal::*;
use thingbuf::mpsc::{Receiver, Sender, channel};
extern crate alloc;
use alloc::boxed::Box;

/// Message from frontend to backend.
#[derive(Default, Clone)]
pub(crate) enum NetMessage {
    #[default]
    Null,
    Net(Net),
    Setting(Setting),
}

/// Message from backend to frontend.
#[derive(Default, Clone)]
pub(crate) enum NetReturn {
    #[default]
    Null,
    Net(Net),
    Unit(Box<dyn AudioUnit>),
}

pub struct NetBackend {
    /// For sending versions for deallocation back to the frontend.
    sender: Option<Sender<NetReturn>>,
    /// For receiving new versions and settings from the frontend.
    receiver: Receiver<NetMessage>,
    net: Net,
}

impl Clone for NetBackend {
    fn clone(&self) -> Self {
        // Allocate a dummy channel.
        let (sender_net, _receiver_net) = channel(1);
        let (_sender_message, receiver_message) = channel(1);
        Self {
            sender: Some(sender_net),
            receiver: receiver_message,
            net: self.net.clone(),
        }
    }
}

impl NetBackend {
    /// Create new backend.
    pub(crate) fn new(sender: Sender<NetReturn>, receiver: Receiver<NetMessage>, net: Net) -> Self {
        Self {
            sender: Some(sender),
            receiver,
            net,
        }
    }

    /// Handle changes made to the backend.
    fn handle_messages(&mut self) {
        let mut latest_net: Option<Net> = None;
        #[allow(clippy::while_let_loop)]
        loop {
            match self.receiver.try_recv() {
                Ok(message) => {
                    match message {
                        NetMessage::Net(net) => {
                            if let Some(mut net) = latest_net {
                                // This is not the latest network, send it back immediately for deallocation.
                                self.net.apply_foreign_edits(&mut net, &self.sender);
                                if self
                                    .sender
                                    .as_ref()
                                    .unwrap()
                                    .try_send(NetReturn::Net(net))
                                    .is_ok()
                                {}
                            }
                            latest_net = Some(net);
                        }
                        NetMessage::Setting(setting) => {
                            self.net.set(setting);
                        }
                        NetMessage::Null => (),
                    }
                }
                _ => break,
            }
        }
        if let Some(mut net) = latest_net {
            // Migrate existing nodes to the new network.
            self.net.migrate(&mut net);
            core::mem::swap(&mut net, &mut self.net);
            self.net.apply_edits(&self.sender);
            // Send the previous network back for deallocation.
            if self
                .sender
                .as_ref()
                .unwrap()
                .try_send(NetReturn::Net(net))
                .is_ok()
            {}
        }
    }
}

impl AudioUnit for NetBackend {
    fn inputs(&self) -> usize {
        self.net.inputs()
    }

    fn outputs(&self) -> usize {
        self.net.outputs()
    }

    fn reset(&mut self) {
        self.net.reset();
        self.handle_messages();
    }

    fn set_sample_rate(&mut self, sample_rate: f64) {
        self.net.set_sample_rate(sample_rate);
        self.handle_messages();
    }

    fn tick(&mut self, input: &[f32], output: &mut [f32]) {
        self.handle_messages();
        self.net.tick_2(input, output, &self.sender);
    }

    fn process(&mut self, size: usize, input: &BufferRef, output: &mut BufferMut) {
        self.handle_messages();
        self.net.process_2(size, input, output, &self.sender);
    }

    fn get_id(&self) -> u64 {
        self.net.get_id()
    }

    fn ping(&mut self, probe: bool, hash: AttoHash) -> AttoHash {
        self.handle_messages();
        self.net.ping(probe, hash)
    }

    fn route(&mut self, input: &SignalFrame, frequency: f64) -> SignalFrame {
        self.handle_messages();
        self.net.route(input, frequency)
    }

    fn footprint(&self) -> usize {
        self.net.footprint()
    }

    fn allocate(&mut self) {
        self.net.allocate();
    }
}