Using source-setup with spotifyaudiosrc

playbin.rs

use gst::glib;
use gst::prelude::*;
use gst::gst_info;

use anyhow::{Error};

use std::env;

use once_cell::sync::Lazy;

static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
    gst::DebugCategory::new(
        "spotifyplayer",
        gst::DebugColorFlags::empty(),
        Some("Spotify audio source"),
    )
});

fn main() -> Result<(), Error> {
    gst::init()?;
    gstspotify::plugin_register_static()?;

    let args: Vec<_> = env::args().collect();
    let uri: &str = if args.len() == 2 {
        args[1].as_ref()
    } else {
        println!("Usage: playbin uri");
        std::process::exit(-1)
    };
    
    let playbin = gst::ElementFactory::make("playbin", None)
        .expect("Failed to create GStreamer playbin element");
    playbin.set_property("uri", uri);

    playbin.connect_closure(
        "source-setup",
        false,
        glib::closure!(|_playbin: &gst::Pipeline, source: &gst::Element| {
            gst_info!(CAT, obj: source, "Hello from source-setup");
            let username = std::env::var("SPOTIFY_USERNAME").unwrap_or_default();
            source.set_property("username", username);
            let password = std::env::var("SPOTIFY_PASSWORD").unwrap_or_default();
            source.set_property("password", password );
            gst_info!(CAT, obj: source, "Goodbye from source-setup");
        }),
    );

    playbin
        .set_state(gst::State::Playing)
        .expect("Unable to set the pipeline to the `Playing` state");
    
    let bus = playbin.bus().unwrap();
    for msg in bus.iter_timed(gst::ClockTime::NONE) {
        use gst::MessageView;

        match msg.view() {
            MessageView::Eos(..) => break,
            MessageView::Error(err) => {
                println!(
                    "Error from {:?}: {} ({:?})",
                    err.src().map(|s| s.path_string()),
                    err.error(),
                    err.debug()
                );
                break;
            }
            _ => (),
        }
    }

    playbin
        .set_state(gst::State::Null)
        .expect("Unable to set the pipeline to the `Null` state");
    Ok(())
}

Using SPOTIFY_USERNAME=foo SPOTIFY_PASSWORD=bar GST_DEBUG=4,*spotify*:6 target/debug/examples/player spotify:track:5URJEznfi3XiVHQCyC3sII.

Log: https://dpaste.com/AKZ872S4M