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use crate::seek_index::get_seek_index;
use anyhow::{anyhow, bail};
use jellycommon::LocalTrack;
use jellymatroska::{block::Block, read::EbmlReader, unflatten::IterWithPos, Master, MatroskaTag};
use log::{debug, info};
use std::{fs::File, io::BufReader, path::PathBuf};
pub fn extract_track(
path_base: PathBuf,
track_info: LocalTrack,
) -> anyhow::Result<Vec<(u64, u64, Vec<u8>)>> {
let source_path = path_base.join(track_info.path);
let file = File::open(&source_path)?;
let mut reader = EbmlReader::new(BufReader::new(file));
let index = get_seek_index(&source_path)?;
let index = index
.get(&(track_info.track as u64))
.ok_or(anyhow!("track missing"))?;
let mut out = Vec::new();
for b in &index.blocks {
reader.seek(b.source_off, MatroskaTag::Cluster(Master::Start))?;
let (duration, block) = read_group(&mut reader)?;
out.push((b.pts, duration, block.data))
}
Ok(out)
}
pub fn read_group(segment: &mut EbmlReader) -> anyhow::Result<(u64, Block)> {
let (mut dur, mut block) = (None, None);
loop {
let item = segment.next().ok_or(anyhow!("eof"))??;
match item {
MatroskaTag::Void(_) => (),
MatroskaTag::Crc32(_) => (),
MatroskaTag::Cluster(_) => (),
MatroskaTag::Timestamp(_) => (),
MatroskaTag::SimpleBlock(_buf) => {
// bail!("unexpected simpleblock, where a group was expected")
}
MatroskaTag::BlockGroup(Master::Start) => (),
MatroskaTag::BlockGroup(Master::End) => return Ok((dur.unwrap(), block.unwrap())),
MatroskaTag::BlockDuration(duration) => dur = Some(duration),
MatroskaTag::Block(buf) => block = Some(Block::parse(&buf)?),
MatroskaTag::Cues(_) => bail!("reached cues, this is the end"),
MatroskaTag::Segment(Master::End) => info!("extractor reached segment end"),
_ => debug!("(rs) tag ignored: {item:?}"),
}
}
}
// fn import_seek_index_segment(
// segment: &mut Unflatten,
// seek_index: &mut BTreeMap<u64, SeekIndex>,
// ) -> Result<()> {
// while let Some(Ok(Unflat { children, item, .. })) = segment.n() {
// match item {
// MatroskaTag::SeekHead(_) => {}
// MatroskaTag::Info(_) => {}
// MatroskaTag::Tags(_) => {}
// MatroskaTag::Cues(_) => {}
// MatroskaTag::Chapters(_) => {}
// MatroskaTag::Tracks(_) => {}
// MatroskaTag::Void(_) => {}
// MatroskaTag::Cluster(_) => {
// let mut children = children.unwrap();
// let mut pts = 0;
// let mut position = children.position();
// loop {
// if let Some(Ok(Unflat { children, item, .. })) = children.n() {
// match item {
// MatroskaTag::Timestamp(ts) => pts = ts,
// MatroskaTag::BlockGroup(_) => {
// trace!("group");
// let mut children = children.unwrap();
// // let position = children.position(); //? TODO where should this point to? cluster or block? // probably block
// while let Some(Ok(Unflat {
// children: _,
// item,
// position,
// })) = children.n()
// {
// match item {
// MatroskaTag::Block(ref buf) => {
// let block = Block::parse(buf)?;
// debug!(
// "block: track={} tso={}",
// block.track, block.timestamp_off
// );
// seek_index_add(seek_index, &block, position, pts);
// }
// _ => trace!("{item:?}"),
// }
// }
// }
// MatroskaTag::SimpleBlock(buf) => {
// let block = Block::parse(&buf)?;
// trace!(
// "simple block: track={} tso={}",
// block.track,
// block.timestamp_off
// );
// trace!("{pts} {}", block.timestamp_off);
// seek_index_add(seek_index, &block, position, pts);
// }
// _ => trace!("(rsc) tag ignored: {item:?}"),
// }
// } else {
// break;
// }
// position = children.position();
// }
// }
// _ => debug!("(rs) tag ignored: {item:?}"),
// };
// }
// Ok(())
// }
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