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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2025 metamuffin <metamuffin.org>
*/
#![feature(iterator_try_collect)]
pub mod fragment;
pub mod fragment_index;
pub mod hls;
pub mod stream_info;
pub mod webvtt;
use anyhow::{anyhow, bail, Context, Result};
use fragment::fragment_stream;
use fragment_index::fragment_index_stream;
use hls::{hls_multivariant_stream, hls_supermultivariant_stream, hls_variant_stream};
use jellybase::common::{
stream::{StreamContainer, StreamSpec},
Node,
};
use std::{collections::BTreeSet, io::SeekFrom, ops::Range, path::PathBuf, sync::Arc};
use stream_info::{stream_info, write_stream_info};
use tokio::{
fs::File,
io::{duplex, AsyncReadExt, AsyncSeekExt, AsyncWriteExt, DuplexStream},
};
#[derive(Debug)]
pub struct SMediaInfo {
pub info: Arc<Node>,
pub files: BTreeSet<PathBuf>,
}
pub struct StreamHead {
pub content_type: &'static str,
pub range_supported: bool,
}
pub fn stream_head(spec: &StreamSpec) -> StreamHead {
let cons = |ct: &'static str, rs: bool| StreamHead {
content_type: ct,
range_supported: rs,
};
let container_ct = |x: StreamContainer| match x {
StreamContainer::WebM => "video/webm",
StreamContainer::Matroska => "video/x-matroska",
StreamContainer::WebVTT => "text/vtt",
StreamContainer::JVTT => "application/jellything-vtt+json",
StreamContainer::MPEG4 => "video/mp4",
};
match spec {
StreamSpec::Whep { .. } => cons("application/x-todo", false),
StreamSpec::WhepControl { .. } => cons("application/x-todo", false),
StreamSpec::Remux { container, .. } => cons(container_ct(*container), true),
StreamSpec::Original { .. } => cons("video/x-matroska", true),
StreamSpec::HlsSuperMultiVariant { .. } => cons("application/vnd.apple.mpegurl", false),
StreamSpec::HlsMultiVariant { .. } => cons("application/vnd.apple.mpegurl", false),
StreamSpec::HlsVariant { .. } => cons("application/vnd.apple.mpegurl", false),
StreamSpec::Info { .. } => cons("application/jellything-stream-info+json", false),
StreamSpec::FragmentIndex { .. } => cons("application/jellything-frag-index+json", false),
StreamSpec::Fragment { container, .. } => cons(container_ct(*container), false),
}
}
pub async fn stream(
info: Arc<SMediaInfo>,
spec: StreamSpec,
range: Range<usize>,
) -> Result<DuplexStream> {
let (a, b) = duplex(4096);
match spec {
StreamSpec::Original { track } => original_stream(info, track, range, b).await?,
StreamSpec::HlsSuperMultiVariant { container } => {
hls_supermultivariant_stream(b, info, container).await?;
}
StreamSpec::HlsMultiVariant { segment, container } => {
hls_multivariant_stream(b, info, segment, container).await?
}
StreamSpec::HlsVariant {
segment,
track,
container,
format,
} => hls_variant_stream(b, info, segment, track, format, container).await?,
StreamSpec::Info { segment: _ } => write_stream_info(info, b).await?,
StreamSpec::FragmentIndex { segment, track } => {
fragment_index_stream(b, info, segment, track).await?
}
StreamSpec::Fragment {
segment,
track,
index,
container,
format,
} => fragment_stream(b, info, track, segment, index, format, container).await?,
_ => bail!("todo"),
}
Ok(a)
}
async fn original_stream(
info: Arc<SMediaInfo>,
track: usize,
range: Range<usize>,
b: DuplexStream,
) -> Result<()> {
let (iinfo, _info) = stream_info(info).await?;
let (file_index, _) = *iinfo
.track_to_file
.get(track)
.ok_or(anyhow!("unknown track"))?;
let mut file = File::open(&iinfo.paths[file_index])
.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?;
if size == 0 {
break Ok(());
}
out.write_all(&buf[..size]).await?;
amount -= size;
}
}
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