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refactor(h264): add docstring for NalParser struct

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This commit is contained in:
Shehriyar Qureshi 2022-11-01 20:13:10 +05:00
parent cda6808dda
commit 0e383aa7d2
1 changed files with 10 additions and 2 deletions
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12
src/codec/h264.rs
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@ -40,8 +40,16 @@ pub(crate) struct Depacketizer {
nal_parser: NalParser, nal_parser: NalParser,
} }
/// Contains logic that converts RTP payload into NALs. /// Parses Annex B sequences from RTP NAL data.
/// [Depacketizer] delegates the conversion to this struct. ///
/// RFC 6184 describes how NAL units should be represented by RTP packets. `Depacketizer` should map each
/// such NAL unit to 1 call to `NalParser::start_rtp_nal`, then 1 or more calls to `NalParser::append_rtp_nal`,
/// then 1 call to `NalParser::end_rtp_nal`.
///
/// If the camera complies with the RFC, this will add exactly one NAL unit. However, what some cameras
/// call a single NAL unit is actually a sequence of multiple NAL units with Annex B separators. `NalParser`
/// looks for these separators and adds multiple NAL units as needed.
/// See [scottlamb/retina#68](https://github.com/scottlamb/retina/issues/68).
#[derive(Debug)] #[derive(Debug)]
struct NalParser { struct NalParser {
/// In state `PreMark`, pieces of NALs, excluding their header bytes. /// In state `PreMark`, pieces of NALs, excluding their header bytes.