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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>
*/
use crate::{
ebml_header, ebml_segment_info, ebml_track_entry, seek_index::get_seek_index,
segment_extractor::SegmentExtractIter,
};
use anyhow::{anyhow, Context, Result};
use jellycommon::{LocalTrack, NodePublic, SourceTrackKind};
use jellymatroska::{read::EbmlReader, write::EbmlWriter, Master, MatroskaTag};
use log::{debug, info};
use std::{
fs::File,
io::{BufReader, BufWriter, Write},
ops::Range,
path::Path,
};
const FRAGMENT_LENGTH: f64 = 2.;
pub fn fragment_index(
path_base: &Path,
item: &NodePublic,
local_track: &LocalTrack,
track_index: usize,
) -> Result<Vec<Range<f64>>> {
let media_info = item.media.as_ref().unwrap();
let source_path = path_base.join(&local_track.path);
let index = get_seek_index(&source_path)?;
let index = index
.get(&(local_track.track as u64))
.ok_or(anyhow!("seek index track missing"))?;
// everything is a keyframe (even though nothing is...)
let force_kf = matches!(
media_info.tracks[track_index].kind,
SourceTrackKind::Subtitles { .. }
);
let n_kf = if force_kf {
index.blocks.len()
} else {
index.keyframes.len()
};
let average_kf_interval = media_info.duration / n_kf as f64;
let kf_per_frag = (FRAGMENT_LENGTH / average_kf_interval).ceil() as usize;
debug!("average keyframe interval: {average_kf_interval}");
debug!(" => keyframes per frag {kf_per_frag}");
let n_frags = n_kf.div_ceil(kf_per_frag);
Ok((0..n_frags)
.map(|i| {
let start = index.blocks[if force_kf {
i * kf_per_frag
} else {
index.keyframes[i * kf_per_frag]
}]
.pts as f64
/ 1000.;
let end = if force_kf {
let n = (i + 1) * kf_per_frag;
if n >= index.blocks.len() {
None
} else {
Some(n)
}
} else {
index.keyframes.get((i + 1) * kf_per_frag).copied()
}
.map(|i| index.blocks[i].pts as f64 / 1000.)
.unwrap_or(media_info.duration);
start..end
})
.collect())
}
pub fn write_fragment_into(
writer: impl Write,
path_base: &Path,
item: &NodePublic,
local_track: &LocalTrack,
track: usize,
webm: bool,
n: usize,
) -> anyhow::Result<()> {
info!("writing fragment {n} of {:?} (track {track})", item.title);
let mut output = EbmlWriter::new(BufWriter::new(writer), 0);
let media_info = item.media.as_ref().unwrap();
let info = media_info
.tracks
.get(track)
.ok_or(anyhow!("track not available"))?
.to_owned();
let source_path = path_base.join(&local_track.path);
let mapped = 1;
info!(
"\t- {track} {source_path:?} ({} => {mapped})",
local_track.track
);
info!("\t {}", info);
let file = File::open(&source_path).context("opening source file")?;
let index = get_seek_index(&source_path)?;
let index = index
.get(&(local_track.track as u64))
.ok_or(anyhow!("track missing 2"))?
.to_owned();
debug!("\t seek index: {} blocks loaded", index.blocks.len());
let mut reader = EbmlReader::new(BufReader::new(file));
let force_kf = matches!(info.kind, SourceTrackKind::Subtitles { .. });
let n_kf = if force_kf {
index.blocks.len()
} else {
index.keyframes.len()
};
let average_kf_interval = media_info.duration / n_kf as f64;
let kf_per_frag = (FRAGMENT_LENGTH / average_kf_interval).ceil() as usize;
debug!("average keyframe interval: {average_kf_interval}");
debug!(" => keyframes per frag {kf_per_frag}");
let (start_block_index, end_block_index) = if force_kf {
(n * kf_per_frag, (n + 1) * kf_per_frag)
} else {
(
*index
.keyframes
.get(n * kf_per_frag)
.ok_or(anyhow!("fragment index out of range"))?,
*index
.keyframes
.get((n + 1) * kf_per_frag)
.unwrap_or(&index.blocks.len()),
)
};
debug!("writing blocks {start_block_index} to {end_block_index}.");
let start_block = &index.blocks[start_block_index];
let last_block_pts = index
.blocks
.get(end_block_index)
.map(|b| b.pts)
.unwrap_or((media_info.duration * 1000.) as u64);
output.write_tag(&ebml_header(webm))?;
output.write_tag(&MatroskaTag::Segment(Master::Start))?;
output.write_tag(&ebml_segment_info(
format!("{}: {info}", item.title.clone().unwrap_or_default()),
(last_block_pts - start_block.pts) as f64 / 1000.,
))?;
output.write_tag(&MatroskaTag::Tags(Master::Collected(vec![])))?;
output.write_tag(&MatroskaTag::Tracks(Master::Collected(vec![
ebml_track_entry(mapped, &info, local_track.codec_private.clone()),
])))?;
reader.seek(start_block.source_off, MatroskaTag::Cluster(Master::Start))?;
let mut reader = SegmentExtractIter::new(&mut reader, local_track.track as u64);
{
// TODO this one caused fragments to get dropped by MSE for no reason
// for i in start_block_index..end_block_index {
// let index_block = &index.blocks[i];
// let mut block = reader.next()?;
// assert_eq!(index_block.size, block.data.len(), "seek index is wrong");
// block.track = 1;
// block.timestamp_off = 0;
// output.write_tag(&MatroskaTag::Cluster(Master::Collected(vec![
// MatroskaTag::Timestamp(index_block.pts - start_block.pts),
// MatroskaTag::SimpleBlock(block.dump()),
// ])))?;
// }
}
{
let mut blocks = vec![MatroskaTag::Timestamp(start_block.pts)];
for i in start_block_index..end_block_index {
let index_block = &index.blocks[i];
let (mut block, duration) = reader.next()?;
assert_eq!(index_block.size, block.data.len(), "seek index is wrong");
block.track = 1;
// TODO this does generate overflows sometimes
block.timestamp_off = (index_block.pts as i64 - start_block.pts as i64)
.try_into()
.unwrap();
if let Some(duration) = duration {
blocks.push(MatroskaTag::BlockGroup(Master::Collected(vec![
MatroskaTag::BlockDuration(duration),
MatroskaTag::Block(block),
])))
} else {
blocks.push(MatroskaTag::SimpleBlock(block))
}
}
output.write_tag(&MatroskaTag::Cluster(Master::Collected(blocks)))?;
}
debug!("wrote {} bytes", output.position());
Ok(())
}
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