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mux: reconstruct display-order PTS for sparse-PTS program streams

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HD-DVD EVO (and DVD VOB) program streams timestamp video at GOP
granularity: only one access unit per GOP carries a PES PTS. The H.264 /
HEVC / VC-1 parsers collapsed a missing PTS to 0, so on such a source
every non-anchor frame landed on the same block timestamp and a decoder
reported "non monotonically increasing dts".

Add a shared SparsePtsReorder that rebuilds a display-order PTS per frame
from the coded picture type (I/P/B) plus the sparse anchor PTS, with a
per-frame duration self-calibrated from the spacing between consecutive
GOP anchors (no external frame-rate needed). Display order is derived via
the classic single-anchor-delay rule (an anchor displays only after the
previously-held anchor; a B displays immediately), exact for the
non-hierarchical GOP structures HD-DVD H.264/VC-1 use. It mirrors the
MPEG-2 parser's GOP-buffered origin-locking.

Gated to the program-stream path only: the three parsers enable it via
with_ps_reorder(is_dvd_ps), so the BD/UHD transport path (per-frame PTS)
is byte-identical and untouched.
This commit is contained in:
Matthew Jackson
2026-07-08 21:54:09 -07:00
parent f8bea78db5
commit 5fdff5664f
5 changed files with 497 additions and 12 deletions
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src/mux/codec/mod.rs
+9 -3
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@@ -25,6 +25,8 @@ pub mod lpcm;
pub mod mpeg2;
/// HDMV PGS (Presentation Graphics Stream) subtitle parser.
pub mod pgs;
/// Display-order PTS reconstruction for sparse-PTS program-stream video.
pub(crate) mod reorder;
/// Shared MPEG/Annex-B start-code scanning helpers.
pub(crate) mod startcode;
/// Dolby TrueHD / Atmos elementary-stream parser.
@@ -166,10 +168,14 @@ pub fn parser_for_codec(
is_dvd_ps: bool,
) -> Box<dyn CodecParser> {
match codec {
Codec::H264 => Box::new(h264::H264Parser::new()),
Codec::Hevc => Box::new(hevc::HevcParser::new()),
// `is_dvd_ps` marks a program-stream source (DVD VOB / HD-DVD EVO), whose
// video is timestamped only at GOP granularity. On that path the H.264 /
// HEVC / VC-1 parsers reconstruct a display-order PTS per frame; on the
// BD/UHD transport path (per-frame PTS) they leave timestamps untouched.
Codec::H264 => Box::new(h264::H264Parser::new().with_ps_reorder(is_dvd_ps)),
Codec::Hevc => Box::new(hevc::HevcParser::new().with_ps_reorder(is_dvd_ps)),
Codec::Mpeg2 => Box::new(mpeg2::Mpeg2Parser::new()),
Codec::Vc1 => Box::new(vc1::Vc1Parser::new()),
Codec::Vc1 => Box::new(vc1::Vc1Parser::new().with_ps_reorder(is_dvd_ps)),
Codec::Ac3 | Codec::Ac3Plus => Box::new(ac3::Ac3Parser::new()),
Codec::DtsHdMa | Codec::DtsHdHr | Codec::Dts => Box::new(dts::DtsParser::new()),
Codec::TrueHd => Box::new(truehd::TrueHdParser::new()),