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use anyhow::{anyhow, bail, Result};
use jellymatroska::{block::Block, read::EbmlReader, unflatten::IterWithPos, Master, MatroskaTag};
use log::{debug, trace, warn};
// pub struct AbsoluteBlock {
// pub pts_base: u64,
// pub inner: Block,
// }
// impl AbsoluteBlock {
// pub fn pts(&self) -> u64 {
// self.inner.timestamp_off as u64 + self.pts_base
// }
// }
pub struct SegmentExtractIter<'a> {
segment: &'a mut EbmlReader,
extract: u64,
}
impl<'a> SegmentExtractIter<'a> {
pub fn new(segment: &'a mut EbmlReader, extract: u64) -> Self {
Self { segment, extract }
}
pub fn next(&mut self) -> Result<Block> {
loop {
let item = self.segment.next().ok_or(anyhow!("eof"))??;
match item {
MatroskaTag::Void(_) => (),
MatroskaTag::Crc32(_) => (),
MatroskaTag::Cluster(_) => (),
MatroskaTag::Timestamp(_) => (),
MatroskaTag::BlockGroup(_) => (),
MatroskaTag::BlockDuration(_) => (),
MatroskaTag::SimpleBlock(buf) | MatroskaTag::Block(buf) => {
let block = Block::parse(&buf)?;
if block.track == self.extract {
trace!("block: track={} tso={}", block.track, block.timestamp_off);
return Ok(block);
}
}
MatroskaTag::Cues(_) => bail!("reached cues, this is the end"),
MatroskaTag::Segment(Master::End) => warn!("extractor encountered segment end"),
_ => debug!("(rs) tag ignored: {item:?}"),
}
}
}
}
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