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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>
*/
use crate::{
cues::{generate_cues, GeneratedCue},
stream_info, SMediaInfo,
};
use anyhow::{anyhow, Result};
use jellyremuxer::{
demuxers::create_demuxer_autodetect,
matroska::{self, Segment},
muxers::write_fragment,
ContainerFormat,
};
use jellystream_types::{FormatNum, IndexNum, StreamContainer, TrackNum};
use jellytranscoder::fragment::transcode;
use std::{
fs::File,
io::{Cursor, Read},
sync::Arc,
};
pub fn fragment_stream(
info: Arc<SMediaInfo>,
track: TrackNum,
index: IndexNum,
format_num: FormatNum,
container: StreamContainer,
) -> Result<Box<dyn Read + Send + Sync>> {
let (iinfo, info) = stream_info(info)?;
let (file_index, track_num) = *iinfo
.track_to_file
.get(track)
.ok_or(anyhow!("track not found"))?;
let media_path = iinfo.paths[file_index].clone();
let track = info.tracks.get(track).ok_or(anyhow!("track not found"))?;
let format = track
.formats
.get(format_num)
.ok_or(anyhow!("format not found"))?;
let mk_track = iinfo.metadata[file_index]
.tracks
.as_ref()
.unwrap()
.entries
.iter()
.find(|t| t.track_number == track_num)
.unwrap();
let timestamp_scale = iinfo.metadata[file_index].info.timestamp_scale;
let total_duration = iinfo.metadata[file_index].info.duration;
let cue_stat = generate_cues(&media_path)?;
let start_cue = cue_stat
.cues
.get(index)
.ok_or(anyhow!("fragment index out of range"))?;
let end_cue = cue_stat
.cues
.get(index + 1)
.copied()
.unwrap_or(GeneratedCue {
position: 0,
time: total_duration.unwrap_or_default() as u64 * timestamp_scale, // TODO rounding?
});
let cluster_offset = start_cue.position;
let duration = (end_cue.time - start_cue.time) as f64 / timestamp_scale as f64;
let mk_info = matroska::Info {
duration: Some(duration),
timestamp_scale,
..Default::default()
};
let mk_tracks = matroska::Tracks {
entries: vec![mk_track.to_owned()],
};
let mut 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
};
cluster.simple_blocks.retain(|b| b.track == track_num);
cluster.block_groups.retain(|b| b.block.track == track_num);
let jr_container = match container {
StreamContainer::WebM => ContainerFormat::Webm,
StreamContainer::Matroska => ContainerFormat::Matroska,
StreamContainer::WebVTT => todo!(),
StreamContainer::MPEG4 => ContainerFormat::Mpeg4,
StreamContainer::JVTT => todo!(),
};
let mut segment = Segment {
info: mk_info,
tracks: Some(mk_tracks),
clusters: vec![cluster],
..Default::default()
};
segment.info.writing_app =
concat!(env!("CARGO_PKG_NAME"), "/", env!("CARGO_PKG_VERSION")).to_string();
if !format.remux {
segment = transcode(
track.kind,
&format!("{media_path:?} {track_num} {index}"),
format,
segment,
)?;
}
let mut out = Vec::new();
write_fragment(jr_container, &mut out, segment)?;
Ok(Box::new(Cursor::new(out)))
}
|
