streamcraft 0.0.1

General purpose data/multimedia pipeline framework
Documentation 
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

// Copyright (C) 2024  MAlba124 <marlhan@proton.me>
//
// StreamCraft 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.
//
// StreamCraft 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 StreamCraft.  If not, see <https://www.gnu.org/licenses/>.

use crate::{
    debug, element_def,
    element_traits::{CommonFormat, Element, ElementArchitecture, ElementType, Sink, Srcs},
    error,
    pipeline::{error::Error, Data, Datagram, Parent, SinkPipe},
};

use crossbeam_channel::{bounded, unbounded, Receiver};

pub struct TextTestSrc {
    sink: SinkPipe,
    parent: Parent,
}

impl TextTestSrc {
    pub fn new() -> Self {
        Self {
            sink: SinkPipe::default(),
            parent: Parent::default(),
        }
    }

    pub fn link_sink_element(&mut self, sink: impl Element + 'static) -> Result<(), Error> {
        if sink.get_sink_type() != ElementType::TextSink {
            return Err(Error::InvalidSinkType);
        }

        if let Sink::One(format) = sink.get_architecture().sink {
            if format == CommonFormat::Text {
                self.sink.set_element(sink);
                return Ok(());
            }
        }

        Err(Error::InvalidSinkType)
    }

    fn run_loop(&mut self) -> bool {
        // TODO: move this somewhere else
        if let Some(receiver) = &self.sink.msg_receiver {
            loop {
                match receiver.try_recv() {
                    Ok(_) => debug!("Received emssage from sink"),
                    Err(e) if e.is_empty() => break,
                    Err(e) => {
                        error!("Failed to receive msg from sink: {e}");
                        return false;
                    }
                }
            }
        }

        if let Some(sender) = &self.sink.datagram_sender {
            if let Err(e) = sender.send(Datagram::Data(Data::Text(String::from("Test\n")))) {
                error!("{e}");
                return false;
            }
        }

        true
    }

    fn init(&mut self) -> Result<(), Error> {
        let (datagram_sender, datagram_receiver) = bounded(0);
        let (msg_sender, my_msg_receiver) = unbounded();
        let parent = Parent::new(msg_sender);
        let mut sink_element = match self.sink.element.take() {
            Some(elm) => elm,
            None => return Err(Error::NoSinkElement),
        };
        sink_element.set_parent(parent);
        let datagram_receiver_clone = datagram_receiver.clone();

        self.sink.thread_handle = Some(std::thread::spawn(move || {
            match sink_element.run(datagram_receiver_clone) {
                Ok(_) => {}
                Err(e) => debug!("Error occurred running sink element: {e}"),
            }
        }));
        self.sink.msg_receiver = Some(my_msg_receiver);
        self.sink.datagram_sender = Some(datagram_sender);

        Ok(())
    }
}

impl Element for TextTestSrc {
    fn get_sink_type(&self) -> ElementType {
        ElementType::TextSrc
    }

    fn get_architecture(&self) -> ElementArchitecture {
        ElementArchitecture {
            sink: Sink::None,
            srcs: Srcs::One(CommonFormat::Text),
        }
    }

    fn run(&mut self, parent_datagram_receiver: Receiver<Datagram>) -> Result<(), Error> {
        self.init()?;

        loop {
            match parent_datagram_receiver
                .recv()
                .map_err(|_| Error::FailedToRecvFromParent)?
            {
                Datagram::Message(msg) => match msg {
                    crate::pipeline::Message::Iter => {
                        if !self.run_loop() {
                            break;
                        }
                        self.parent.send_iter_fin()?;
                    }
                    crate::pipeline::Message::Quit => break,
                    _ => return Err(Error::ReceivedInvalidDatagramFromParent),
                },
                _ => return Err(Error::ReceivedInvalidDatagramFromParent),
            }
        }

        self.parent.send_finished()
    }

    fn set_parent(&mut self, parent: Parent) {
        self.parent = parent;
    }

    fn cleanup(&mut self) -> Result<(), crate::pipeline::error::Error> {
        self.sink.send_quit()?;
        self.sink.drop_data_sender();

        self.sink.join_thread()
    }
}

element_def! {
    TextTestSrc,
    "texttestsrc"
}