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examples: webrtc: sendrecv: rust: Implement OFFER_REQUEST handling

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Allow requesting an offer from the peer if we're joining a call with a
peer, and allow the peer to request an offer from us if waiting for an
incoming call.

This implements all 4 variants the protocol allows for.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3758>
This commit is contained in:
Sebastian Dröge 2023-01-20 12:25:23 +02:00 committed by GStreamer Marge Bot
parent 638465908e
commit bf4a3c89cd
1 changed files with 32 additions and 2 deletions
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34
subprojects/gst-examples/webrtc/sendrecv/gst-rust/src/main.rs
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@ -53,6 +53,9 @@ struct Args {
/// Our ID. If not given then a random ID is created. /// Our ID. If not given then a random ID is created.
#[clap(short, long)] #[clap(short, long)]
our_id: Option<u32>, our_id: Option<u32>,
/// Request that the peer creates an offer.
#[clap(short, long, default_value = "false")]
remote_offerer: bool,
} }
// JSON messages we communicate with // JSON messages we communicate with
@ -155,7 +158,9 @@ impl App {
})); }));
// Connect to on-negotiation-needed to handle sending an Offer // Connect to on-negotiation-needed to handle sending an Offer
if app.args.peer_id.is_some() { if app.args.peer_id.is_some() && !app.args.remote_offerer
|| app.args.peer_id.is_none() && app.args.remote_offerer
{
let vpay = app.pipeline.by_name("vpay").unwrap(); let vpay = app.pipeline.by_name("vpay").unwrap();
let apay = app.pipeline.by_name("apay").unwrap(); let apay = app.pipeline.by_name("apay").unwrap();
@ -218,7 +223,7 @@ impl App {
// Asynchronously set the pipeline to Playing if we're creating the offer, // Asynchronously set the pipeline to Playing if we're creating the offer,
// otherwise do that after the offer was received. // otherwise do that after the offer was received.
if app.args.peer_id.is_some() { if app.args.peer_id.is_some() && !app.args.remote_offerer {
app.pipeline.call_async(|pipeline| { app.pipeline.call_async(|pipeline| {
// If this fails, post an error on the bus so we exit // If this fails, post an error on the bus so we exit
if pipeline.set_state(gst::State::Playing).is_err() { if pipeline.set_state(gst::State::Playing).is_err() {
@ -240,6 +245,21 @@ impl App {
bail!("Got error message: {}", msg); bail!("Got error message: {}", msg);
} }
if msg == "OFFER_REQUEST" {
self.pipeline.call_async(|pipeline| {
// If this fails, post an error on the bus so we exit
if pipeline.set_state(gst::State::Playing).is_err() {
gst::element_error!(
pipeline,
gst::LibraryError::Failed,
("Failed to set pipeline to Playing")
);
}
});
return Ok(());
}
let json_msg: JsonMsg = serde_json::from_str(msg)?; let json_msg: JsonMsg = serde_json::from_str(msg)?;
match json_msg { match json_msg {
@ -758,6 +778,8 @@ async fn async_main() -> Result<(), anyhow::Error> {
} }
if let Some(peer_id) = args.peer_id { if let Some(peer_id) = args.peer_id {
println!("Setting up call with peer id {}", peer_id);
// Join the given session // Join the given session
ws.send(WsMessage::Text(format!("SESSION {}", peer_id))) ws.send(WsMessage::Text(format!("SESSION {}", peer_id)))
.await?; .await?;
@ -770,6 +792,14 @@ async fn async_main() -> Result<(), anyhow::Error> {
if msg != WsMessage::Text("SESSION_OK".into()) { if msg != WsMessage::Text("SESSION_OK".into()) {
bail!("server error: {:?}", msg); bail!("server error: {:?}", msg);
} }
// If we expect the peer to create the offer request it now
if args.remote_offerer {
println!("Requesting offer from peer");
ws.send(WsMessage::Text("OFFER_REQUEST".into())).await?;
}
} else {
println!("Waiting for incoming call");
} }
// All good, let's run our message loop // All good, let's run our message loop