seek/
seek.rs

1use std::error::Error;
2use std::num::NonZeroUsize;
3use std::time::Duration;
4
5use icy_metadata::{IcyHeaders, IcyMetadataReader, RequestIcyMetadata};
6use rodio::source::SeekError;
7use stream_download::http::HttpStream;
8use stream_download::http::reqwest::Client;
9use stream_download::source::DecodeError;
10use stream_download::storage::bounded::BoundedStorageProvider;
11use stream_download::storage::memory::MemoryStorageProvider;
12use stream_download::{Settings, StreamDownload};
13
14#[tokio::main]
15async fn main() -> Result<(), Box<dyn Error>> {
16    let (_stream, handle) = rodio::OutputStream::try_default()?;
17    let sink = rodio::Sink::try_new(&handle)?;
18
19    // We need to add a header to tell the Icecast server that we can parse the metadata embedded
20    // within the stream itself.
21    let client = Client::builder().request_icy_metadata().build()?;
22
23    let stream =
24        HttpStream::new(client, "https://ice6.somafm.com/insound-128-mp3".parse()?).await?;
25
26    let icy_headers = IcyHeaders::parse_from_headers(stream.headers());
27    println!("Icecast headers: {icy_headers:#?}\n");
28    println!("content type={:?}\n", stream.content_type());
29
30    // buffer 5 seconds of audio
31    // bitrate (in kilobits) / bits per byte * bytes per kilobyte * 5 seconds
32    let prefetch_bytes = icy_headers.bitrate().unwrap() / 8 * 1024 * 5;
33
34    let reader = match StreamDownload::from_stream(
35        stream,
36        // use bounded storage to keep the underlying size from growing indefinitely
37        BoundedStorageProvider::new(
38            MemoryStorageProvider,
39            // be liberal with the buffer size, you need to make sure it holds enough space to
40            // prevent any out-of-bounds reads
41            NonZeroUsize::new(512 * 1024).unwrap(),
42        ),
43        Settings::default().prefetch_bytes(prefetch_bytes as u64),
44    )
45    .await
46    {
47        Ok(reader) => reader,
48        Err(e) => return Err(e.decode_error().await)?,
49    };
50    sink.append(rodio::Decoder::new(IcyMetadataReader::new(
51        reader,
52        // Since we requested icy metadata, the metadata interval header should be present in the
53        // response. This will allow us to parse the metadata within the stream
54        icy_headers.metadata_interval(),
55        // Print the stream metadata whenever we receive new values
56        |metadata| println!("{metadata:#?}\n"),
57    ))?);
58
59    let handle = tokio::task::spawn_blocking(move || {
60        println!("seeking in 5 seconds\n");
61        std::thread::sleep(Duration::from_secs(5));
62        println!("seeking to beginning\n");
63        sink.try_seek(Duration::from_secs(0))?;
64        std::thread::sleep(Duration::from_secs(5));
65        println!("seeking to 10 seconds\n");
66        sink.try_seek(Duration::from_secs(10))?;
67        sink.sleep_until_end();
68        Ok::<_, SeekError>(())
69    });
70    handle.await??;
71    Ok(())
72}
seek/seek.rs

seek/
seek.rs
