helvum 0.3.3

A GTK patchbay for pipewire
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

// main.rs
//
// Copyright 2021 Tom A. Wagner <tom.a.wagner@protonmail.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: GPL-3.0-only

mod application;
mod pipewire_connection;
mod view;

use glib::PRIORITY_DEFAULT;
use gtk::prelude::*;
use pipewire::spa::Direction;

/// Messages sent by the GTK thread to notify the pipewire thread.
#[derive(Debug, Clone)]
enum GtkMessage {
    /// Toggle a link between the two specified ports.
    ToggleLink { port_from: u32, port_to: u32 },
    /// Quit the event loop and let the thread finish.
    Terminate,
}

/// Messages sent by the pipewire thread to notify the GTK thread.
#[derive(Debug, Clone)]
enum PipewireMessage {
    NodeAdded {
        id: u32,
        name: String,
        node_type: Option<NodeType>,
    },
    PortAdded {
        id: u32,
        node_id: u32,
        name: String,
        direction: Direction,
        media_type: Option<MediaType>,
    },
    LinkAdded {
        id: u32,
        node_from: u32,
        port_from: u32,
        node_to: u32,
        port_to: u32,
        active: bool,
    },
    LinkStateChanged {
        id: u32,
        active: bool,
    },
    NodeRemoved {
        id: u32,
    },
    PortRemoved {
        id: u32,
        node_id: u32,
    },
    LinkRemoved {
        id: u32,
    },
}

#[derive(Debug, Clone)]
pub enum NodeType {
    Input,
    Output,
}

#[derive(Debug, Copy, Clone)]
pub enum MediaType {
    Audio,
    Video,
    Midi,
}

#[derive(Debug, Clone)]
pub struct PipewireLink {
    pub node_from: u32,
    pub port_from: u32,
    pub node_to: u32,
    pub port_to: u32,
}

static GLIB_LOGGER: glib::GlibLogger = glib::GlibLogger::new(
    glib::GlibLoggerFormat::Structured,
    glib::GlibLoggerDomain::CrateTarget,
);

fn init_glib_logger() {
    log::set_logger(&GLIB_LOGGER).expect("Failed to set logger");

    // Glib does not have a "Trace" log level, so only print messages "Debug" or higher priority.
    log::set_max_level(log::LevelFilter::Debug);
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    init_glib_logger();
    gtk::init()?;

    // Aquire main context so that we can attach the gtk channel later.
    let ctx = glib::MainContext::default();
    let _guard = ctx.acquire().unwrap();

    // Start the pipewire thread with channels in both directions.
    let (gtk_sender, gtk_receiver) = glib::MainContext::channel(PRIORITY_DEFAULT);
    let (pw_sender, pw_receiver) = pipewire::channel::channel();
    let pw_thread =
        std::thread::spawn(move || pipewire_connection::thread_main(gtk_sender, pw_receiver));

    let app = application::Application::new(gtk_receiver, pw_sender.clone());

    app.run();

    pw_sender
        .send(GtkMessage::Terminate)
        .expect("Failed to send message");

    pw_thread.join().expect("Pipewire thread panicked");

    Ok(())
}