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Builds out the full v1 scope: a vendored+patched openscreen subset for low-latency Cast Streaming (Mirroring receiver 0F5096E8) alongside the existing Cast V2/HLS and new DLNA/AVTransport casting paths, breadcastd's Idle/Casting state machine with a private IPC socket, the breadcast GTK4 popup as a thin IPC client, and bread.cast.*/bread.command.cast.* breadd integration (device discovery, start/stop, mirroring lifecycle events). Also adds bakery/systemd/Forgejo CI packaging. Validated end-to-end against a real Chromecast/Google TV: negotiated Cast Streaming session, live pipeline playback, and daemon+GUI click-to-cast/ stop through the actual popup.
37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
# Vendoring notes
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This is [rust_cast 0.21.0](https://github.com/azasypkin/rust-cast) (MIT
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licensed), vendored via `[patch.crates-io]` in the workspace `Cargo.toml`
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purely to add one method upstream doesn't have: a generic point-to-point
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send on an arbitrary CASTV2 namespace.
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## Why
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breadcast's Cast Streaming integration (`breadcast-caststream-sys`, wrapping
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a vendored `chromium/openscreen`) needs to exchange OFFER/ANSWER JSON with a
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launched receiver app on the `urn:x-cast:com.google.cast.webrtc` namespace --
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a point-to-point conversation targeting that app's `transport_id`, the same
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target `ConnectionChannel`/`MediaChannel` already use. None of rust_cast's
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built-in channels expose that: `ReceiverChannel::broadcast_message()` is the
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closest, but it hardcodes destination `"*"`, which is a different
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conversation than a namespace-specific exchange with one particular app.
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Receiving such messages needs no patch -- `CastDevice::receive()` already
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returns them as `ChannelMessage::Raw(CastMessage)` whenever no built-in
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channel claims the namespace.
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## The patch
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`src/lib.rs`: added `CastDevice::send_message<M: Serialize>(&self, namespace,
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destination, message)`, built the same way `ReceiverChannel::broadcast_message()`
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is internally, but with a caller-supplied `destination` instead of a
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hardcoded `"*"`. See the doc comment on that method for the exact rationale
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(marked "LOCAL PATCH (breadcast, not upstream)").
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## Rolling the pin
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To move to a newer rust_cast release: copy the new version from
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`~/.cargo/registry/src/*/rust_cast-<version>/`, re-apply the same method
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addition (small enough to redo by hand), swap the version in this
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directory's own `Cargo.toml`, and update the `path` if the directory name
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changes.
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