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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) 2024 metamuffin <metamuffin.org>
*/
#![feature(iterator_try_collect)]
pub mod hls;
pub mod jhls;
pub mod segment;
pub mod webvtt;
use anyhow::{anyhow, bail, Context, Result};
use hls::{hls_master_stream, hls_variant_stream};
use jellybase::{permission::PermissionSetExt, CONF};
use jellycommon::{
stream::{StreamFormat, StreamSpec},
user::{PermissionSet, UserPermission},
LocalTrack, Node, TrackSource,
};
use jhls::jhls_index;
use segment::segment_stream;
use std::{io::SeekFrom, ops::Range};
use tokio::{
fs::File,
io::{duplex, AsyncReadExt, AsyncSeekExt, AsyncWriteExt, DuplexStream},
};
use tokio_util::io::SyncIoBridge;
use webvtt::webvtt_stream;
pub struct StreamHead {
pub content_type: &'static str,
pub range_supported: bool,
}
#[rustfmt::skip]
pub fn stream_head(spec: &StreamSpec) -> StreamHead {
let webm_or_mkv = if spec.webm.unwrap_or(false) { "video/webm" } else { "video/x-matroska" };
match spec.format {
StreamFormat::Original => StreamHead { content_type: "video/x-matroska", range_supported: true },
StreamFormat::Matroska => StreamHead { content_type: webm_or_mkv, range_supported: true },
StreamFormat::HlsMaster | StreamFormat::HlsVariant => StreamHead { content_type: "application/vnd.apple.mpegurl", range_supported: false },
StreamFormat::JhlsIndex => StreamHead { content_type: "application/jellything-seekindex+json", range_supported: false },
StreamFormat::Webvtt => StreamHead { content_type: "text/vtt", range_supported: false },
StreamFormat::Snippet => StreamHead { content_type: webm_or_mkv, range_supported: false },
}
}
pub async fn stream(
node: Node,
spec: StreamSpec,
range: Range<usize>,
perms: &PermissionSet,
) -> Result<DuplexStream> {
perms.assert(&UserPermission::StreamFormat(spec.format))?;
let (a, b) = duplex(4096);
// TODO remux of mixed remote and local tracks?!
let track_sources = node
.private
.source
.to_owned()
.ok_or(anyhow!("node has no media"))?;
let local_tracks = spec
.tracks
.iter()
.map(|i| {
anyhow::Ok(
match track_sources
.get(*i)
.ok_or(anyhow!("track does not exist"))?
{
TrackSource::Local(t) => t.to_owned(),
TrackSource::Remote(_) => bail!("track is not local"),
},
)
})
.collect::<anyhow::Result<Vec<_>>>()?
.into_iter()
.collect::<Vec<_>>();
match spec.format {
StreamFormat::Original => original_stream(local_tracks, spec, range, b).await?,
StreamFormat::Matroska => remux_stream(node, local_tracks, spec, range, b).await?,
StreamFormat::HlsMaster => hls_master_stream(node, local_tracks, spec, b).await?,
StreamFormat::HlsVariant => hls_variant_stream(node, local_tracks, spec, b).await?,
StreamFormat::JhlsIndex => jhls_index(node, &local_tracks, spec, b, perms).await?,
StreamFormat::Snippet => segment_stream(node, local_tracks, spec, b, perms).await?,
StreamFormat::Webvtt => webvtt_stream(node, local_tracks, spec, b).await?,
}
Ok(a)
}
async fn remux_stream(
node: Node,
local_tracks: 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.media_path.to_owned(),
node.public,
local_tracks,
spec.tracks,
spec.webm.unwrap_or(false),
)
});
Ok(())
}
async fn original_stream(
local_tracks: 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 = local_tracks[spec.tracks[0]].clone();
let mut file = File::open(CONF.media_path.join(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?;
if size == 0 {
break Ok(());
}
out.write_all(&buf[..size]).await?;
amount -= size;
}
}
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