pocketstation 1.0.0

Source-aware desktop audio Session SDK
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

use std::sync::Arc;

use crate::graph::{
    ConfigError, ExecutionPartition, MediaCaps, Multiplicity, PortDirection, PortSpec,
    SafetyContract, SignalSpec,
};
use crate::session::{
    SampleFormat, SampleSpec, SessionEngineBuilder, SessionStartOptions, SourceCancellation,
    SourceConfiguration, SourceDriver, SourceDriverError, SourceEmission, SourceFactory,
    SourceManifest, SourceManifestError, SourceRegistrationError, SourceTypeId,
};

use crate::graph::PrepareContext;

struct RegistrationOnlyDriver;

impl SourceDriver for RegistrationOnlyDriver {
    fn prepare(
        &mut self,
        _context: &crate::session::SourcePrepareContext,
    ) -> Result<(), SourceDriverError> {
        Ok(())
    }

    fn next(
        &mut self,
        _cancellation: &SourceCancellation,
    ) -> Result<Option<SourceEmission>, SourceDriverError> {
        Ok(None)
    }

    fn close(&mut self) -> Result<(), SourceDriverError> {
        Ok(())
    }
}

struct RegistrationOnlyFactory {
    manifest: SourceManifest,
}

impl SourceFactory for RegistrationOnlyFactory {
    fn manifest(&self) -> &SourceManifest {
        &self.manifest
    }

    fn validate_config(&self, _configuration: &SourceConfiguration) -> Result<(), ConfigError> {
        Ok(())
    }

    fn create(
        &self,
        _configuration: &SourceConfiguration,
    ) -> Result<Box<dyn SourceDriver>, SourceDriverError> {
        Ok(Box::new(RegistrationOnlyDriver))
    }
}

fn source_type_id() -> SourceTypeId {
    SourceTypeId::new("dev.pocketstation.fixture.external-source.v1").unwrap()
}

fn factory(revision: u32) -> Arc<dyn SourceFactory> {
    Arc::new(RegistrationOnlyFactory {
        manifest: SourceManifest {
            source_type_id: source_type_id(),
            revision,
            generation: 1,
            outputs: vec![PortSpec {
                name: "samples".to_owned(),
                direction: PortDirection::Output,
                signal: SignalSpec::custom("dev.pocketstation.fixture.samples.v1")
                    .with_schema("urn:pocketstation:fixture:samples:v1"),
                media: MediaCaps::Binary(crate::graph::BinaryFormat::Raw),
                multiplicity: Multiplicity::Many,
                required: true,
            }],
            execution: ExecutionPartition::BlockingWorker,
            safety: SafetyContract::AllocationAllowed,
        },
    })
}

fn builder() -> SessionEngineBuilder {
    SessionEngineBuilder::new(
        PrepareContext::new(SampleSpec::new(48_000, 1, SampleFormat::F32Interleaved)),
        8,
        SessionStartOptions::default(),
    )
    .unwrap()
}

#[test]
fn given_valid_factory_when_registered_then_built_engine_retains_manifest() {
    let mut builder = builder();
    builder.register_source_factory(factory(7)).unwrap();

    let registered = builder.source_manifest(&source_type_id()).unwrap();
    assert_eq!(registered.revision, 7);
    assert_eq!(registered.source_type_id, source_type_id());

    let engine = builder.build().unwrap();
    let retained = engine.source_manifest(&source_type_id()).unwrap();
    assert_eq!(retained.revision, 7);
    assert_eq!(retained.outputs[0].name, "samples");
}

#[test]
fn given_registered_identity_when_revision_conflicts_then_first_factory_is_preserved() {
    let mut builder = builder();
    builder.register_source_factory(factory(7)).unwrap();

    let error = builder.register_source_factory(factory(8)).err().unwrap();
    assert!(matches!(
        error,
        SourceRegistrationError::DuplicateSourceType(id) if id == source_type_id()
    ));
    assert_eq!(
        builder.source_manifest(&source_type_id()).unwrap().revision,
        7
    );
}

#[test]
fn given_zero_revision_when_registered_then_public_boundary_rejects_manifest() {
    let mut builder = builder();

    let error = builder.register_source_factory(factory(0)).err().unwrap();
    assert!(matches!(
        error,
        SourceRegistrationError::InvalidManifest(SourceManifestError::ZeroVersion)
    ));
    assert!(builder.source_manifest(&source_type_id()).is_none());
}