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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) 2026 metamuffin <metamuffin.org>
*/
use crate::{SMediaInfo, cues::generate_cues, stream_info};
use anyhow::{Ok, Result, anyhow};
use jellycache::HashKey;
use jellyremuxer::{
ContainerFormat,
demuxers::create_demuxer_autodetect,
matroska::{self, Info, Segment},
muxers::{write_frag, write_init},
};
use jellystream_types::{
FormatNum, IndexNum, StreamContainer, StreamFormatInfo, StreamTrackInfo, TrackNum,
};
use jellytranscoder::fragment::transcode;
use std::{
fs::File,
io::{Cursor, Read},
path::Path,
sync::Arc,
};
pub fn fragment_init(
sinfo: &SMediaInfo,
track_num: TrackNum,
format_num: FormatNum,
) -> Result<Segment> {
let (iinfo, info) = stream_info(sinfo)?;
let (file_index, file_track_num) = *iinfo
.track_to_file
.get(track_num)
.ok_or(anyhow!("track not found"))?;
let track = info
.tracks
.get(track_num)
.ok_or(anyhow!("track not found"))?;
let format = track
.formats
.get(format_num)
.ok_or(anyhow!("format not found"))?;
let mut mk_track = iinfo.metadata[file_index]
.tracks
.as_ref()
.unwrap()
.entries
.iter()
.find(|t| t.track_number == file_track_num)
.unwrap()
.to_owned();
let timestamp_scale = iinfo.metadata[file_index].info.timestamp_scale;
let duration = iinfo.metadata[file_index].info.duration;
if !format.remux {
let seg = fragment_transcode_full(
sinfo,
track,
track_num,
file_track_num,
0,
0,
&iinfo.paths[file_index],
format,
)?;
mk_track = seg.tracks.unwrap().entries[0].clone();
}
Ok(Segment {
tracks: Some(matroska::Tracks {
entries: vec![mk_track],
}),
info: Info {
duration,
timestamp_scale,
..Default::default()
},
..Default::default()
})
}
pub fn fragment_init_stream(
sinfo: Arc<SMediaInfo>,
track: TrackNum,
format_num: FormatNum,
container: StreamContainer,
) -> Result<Box<dyn Read + Send + Sync>> {
let init = fragment_init(&sinfo, track, format_num)?;
let mut buf = Vec::new();
write_init(map_container(container), &mut buf, init)?;
Ok(Box::new(Cursor::new(buf)))
}
pub fn fragment_remux(
sinfo: &SMediaInfo,
media_path: &Path,
file_track_num: u64,
index: IndexNum,
next_kf: bool,
) -> Result<Segment> {
let cue_stat = generate_cues(&sinfo.cache, media_path)?;
let start_cue = cue_stat
.cues
.get(index)
.ok_or(anyhow!("fragment index out of range"))?;
let cluster_offset = start_cue.position;
let (mut cluster, next_cluster) = {
let media_file = File::open(media_path)?;
let mut media = create_demuxer_autodetect(Box::new(media_file))?
.ok_or(anyhow!("media container unknown"))?;
media.seek_cluster(Some(cluster_offset))?;
(
media
.read_cluster()?
.ok_or(anyhow!("cluster unexpectedly missing"))?
.1,
next_kf
.then(|| Ok(media.read_cluster()?.map(|(_, x)| x)))
.transpose()?
.flatten(),
)
};
cluster.simple_blocks.retain(|b| b.track == file_track_num);
cluster
.block_groups
.retain(|b| b.block.track == file_track_num);
let mut clusters = vec![cluster];
if let Some(next_cluster) = next_cluster {
clusters.push(next_cluster);
}
Ok(Segment {
clusters,
..Default::default()
})
}
#[allow(clippy::too_many_arguments)]
pub fn fragment_transcode_full(
sinfo: &SMediaInfo,
track: &StreamTrackInfo,
track_num: TrackNum,
file_track_num: u64,
index: IndexNum,
end_pts: u64,
media_path: &Path,
output_format: &StreamFormatInfo,
) -> Result<Segment> {
let (input_format_num, input_format) = track
.formats
.iter()
.enumerate()
.find(|(_, t)| t.remux)
.unwrap();
transcode(
&sinfo.cache,
&sinfo.config.transcoder,
track.kind,
&format!("{}-T{file_track_num}-I{index}", HashKey(&media_path)),
input_format,
output_format,
index,
end_pts,
|| {
let init = fragment_init(sinfo, track_num, input_format_num)?;
let seg = fragment_remux(sinfo, media_path, file_track_num, index, true)?;
Ok(Segment {
tracks: init.tracks,
info: init.info,
clusters: seg.clusters,
..Default::default()
})
},
)
}
pub fn fragment_stream(
sinfo: Arc<SMediaInfo>,
track_num: TrackNum,
index: IndexNum,
format_num: FormatNum,
container: StreamContainer,
) -> Result<Box<dyn Read + Send + Sync>> {
let (iinfo, info) = stream_info(&sinfo)?;
let (file_index, file_track_num) = *iinfo
.track_to_file
.get(track_num)
.ok_or(anyhow!("track not found"))?;
let media_path = iinfo.paths[file_index].clone();
let track = info
.tracks
.get(track_num)
.ok_or(anyhow!("track not found"))?;
let output_format = track
.formats
.get(format_num)
.ok_or(anyhow!("format not found"))?;
let cue_stat = generate_cues(&sinfo.cache, &media_path)?;
let end_pts = cue_stat.cues.get(index + 1).map(|e| e.time).unwrap_or(0); // TODO
let segment = if output_format.remux {
fragment_remux(&sinfo, &media_path, file_track_num, index, false)?
} else {
fragment_transcode_full(
&sinfo,
track,
track_num,
file_track_num,
index,
end_pts,
&media_path,
output_format,
)?
};
let mut out = Vec::new();
write_frag(map_container(container), &mut out, segment, index, end_pts)?;
Ok(Box::new(Cursor::new(out)))
}
fn map_container(container: StreamContainer) -> ContainerFormat {
match container {
StreamContainer::WebM => ContainerFormat::Webm,
StreamContainer::Matroska => ContainerFormat::Matroska,
StreamContainer::WebVTT => todo!(),
StreamContainer::MP4 => ContainerFormat::MP4,
StreamContainer::JVTT => todo!(),
}
}
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