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use anyhow::{anyhow, bail, Context, Result};
use jellybase::CONF;
use jellycommon::{
stream::{StreamFormat, StreamSpec},
LocalTrack, MediaSource, Node,
};
use std::{io::SeekFrom, ops::Range};
use tokio::{
fs::File,
io::{duplex, AsyncReadExt, AsyncSeekExt, AsyncWriteExt, DuplexStream},
};
use tokio_util::io::SyncIoBridge;
pub async fn stream(node: Node, spec: StreamSpec, range: Range<usize>) -> Result<DuplexStream> {
let (a, b) = duplex(4096);
let track_sources = match node
.private
.source
.as_ref()
.ok_or(anyhow!("node has no media"))?
{
MediaSource::Local { tracks } => tracks.to_owned(),
_ => bail!("node tracks are not local"),
};
match spec.format {
StreamFormat::Original => original_stream(track_sources, spec, range, b).await?,
StreamFormat::Matroska | StreamFormat::Webm => {
remux_stream(node, track_sources, spec, range, b).await?
}
StreamFormat::Hls => todo!(),
StreamFormat::Jhls => todo!(),
StreamFormat::Segment => todo!(),
}
Ok(a)
}
async fn remux_stream(
node: Node,
track_sources: Vec<LocalTrack>,
spec: StreamSpec,
range: Range<usize>,
b: DuplexStream,
) -> Result<()> {
let b = SyncIoBridge::new(b);
tokio::task::spawn_blocking(move || {
jellyremuxer::remux_stream_into(
b,
range,
CONF.library_path.to_owned(),
node.public,
track_sources,
spec.tracks,
spec.format == StreamFormat::Webm,
)
});
Ok(())
}
async fn original_stream(
track_sources: Vec<LocalTrack>,
spec: StreamSpec,
range: Range<usize>,
b: DuplexStream,
) -> Result<()> {
if spec.tracks.len() != 1 {
bail!("invalid amout of source \"tracks\". original only allows for exactly one.")
}
let source = track_sources[spec.tracks[0]].clone();
let mut file = File::open(source.path).await.context("opening source")?;
file.seek(SeekFrom::Start(range.start as u64))
.await
.context("seek source")?;
tokio::task::spawn(copy_stream(file, b, range.end - range.start));
Ok(())
}
async fn copy_stream(mut inp: File, mut out: DuplexStream, mut amount: usize) -> Result<()> {
let mut buf = [0u8; 4096];
loop {
let size = inp.read(&mut buf[..amount.min(4096)]).await?;
out.write_all(&buf[..size]).await?;
amount -= size;
}
}
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