mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-11-26 13:31:00 +00:00
closedcaption: Switch SCC parser from combine to nom
nom gives easier to understand compiler errors when something is wrong and compiles considerably faster.
This commit is contained in:
Sebastian Dröge
parent
d56ae71e0e
commit
ffae72cb0f
3 changed files with 197 additions and 193 deletions
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@ -10,6 +10,7 @@ repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs"
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[dependencies]
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glib = { git = "https://github.com/gtk-rs/gtk-rs" }
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combine = "4.0"
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nom = "6.0"
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either = "1"
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uuid = { version = "0.8", features = ["v4"] }
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chrono = "0.4"
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@ -47,8 +47,6 @@ struct State {
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last_timecode: Option<gst_video::ValidVideoTimeCode>,
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}
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type CombineError<'a> = combine::easy::ParseError<&'a [u8]>;
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impl Default for State {
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fn default() -> Self {
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Self {
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@ -64,7 +62,10 @@ impl Default for State {
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}
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impl State {
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fn get_line(&mut self, drain: bool) -> Result<Option<SccLine>, (&[u8], CombineError)> {
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fn get_line(
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&mut self,
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drain: bool,
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) -> Result<Option<SccLine>, (&[u8], nom::error::Error<&[u8]>)> {
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let line = match self.reader.get_line_with_drain(drain) {
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None => {
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return Ok(None);
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@ -1,4 +1,4 @@
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// Copyright (C) 2019 Sebastian Dröge <sebastian@centricular.com>
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// Copyright (C) 2019,2020 Sebastian Dröge <sebastian@centricular.com>
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// Copyright (C) 2019 Jordan Petridis <jordan@centricular.com>
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//
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// This library is free software; you can redistribute it and/or
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@ -16,11 +16,7 @@
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// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
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// Boston, MA 02110-1335, USA.
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use combine::parser::byte::hex_digit;
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use combine::parser::range::{range, take_while1};
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use combine::parser::EasyParser;
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use combine::{choice, eof, from_str, many1, one_of, optional, token, unexpected_any, value};
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use combine::{ParseError, Parser, RangeStream};
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use nom::IResult;
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct TimeCode {
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@ -51,164 +47,161 @@ pub struct SccParser {
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}
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/// Parser for parsing a run of ASCII, decimal digits and converting them into a `u32`
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fn digits<'a, I: 'a>() -> impl Parser<I, Output = u32>
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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from_str(take_while1(|c: u8| c >= b'0' && c <= b'9').message("while parsing digits"))
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fn digits(s: &[u8]) -> IResult<&[u8], u32> {
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use nom::bytes::complete::take_while;
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use nom::character::is_digit;
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use nom::combinator::map_res;
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map_res(
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map_res(take_while(is_digit), |s: &[u8]| std::str::from_utf8(s)),
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|s: &str| s.parse::<u32>(),
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)(s)
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}
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/// Parser for a run of decimal digits, that converts them into a `u32` and checks if the result is
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/// in the allowed range.
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fn digits_range<'a, I: 'a, R: std::ops::RangeBounds<u32>>(range: R) -> impl Parser<I, Output = u32>
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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digits().then(move |v| {
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if range.contains(&v) {
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value(v).left()
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} else {
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unexpected_any("digits out of range").right()
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}
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})
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fn digits_range<R: std::ops::RangeBounds<u32>>(
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range: R,
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) -> impl FnMut(&[u8]) -> IResult<&[u8], u32> {
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use nom::combinator::verify;
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use nom::error::context;
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move |s: &[u8]| context("digits out of range", verify(digits, |v| range.contains(v)))(s)
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}
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/// Parser for a timecode in the form `hh:mm:ss:fs`
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fn timecode<'a, I: 'a>() -> impl Parser<I, Output = TimeCode>
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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(
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digits(),
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token(b':'),
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digits_range(0..60),
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token(b':'),
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digits_range(0..60),
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one_of([b':', b'.', b';', b','].iter().cloned()),
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digits(),
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)
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.map(|(hours, _, minutes, _, seconds, sep, frames)| TimeCode {
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hours,
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minutes,
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seconds,
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frames,
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drop_frame: sep == b';' || sep == b',',
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})
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.message("while parsing timecode")
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fn timecode(s: &[u8]) -> IResult<&[u8], TimeCode> {
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use nom::character::complete::{char, one_of};
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use nom::combinator::map;
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use nom::error::context;
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use nom::sequence::tuple;
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context(
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"invalid timecode",
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map(
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tuple((
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digits,
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char(':'),
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digits_range(0..60),
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char(':'),
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digits_range(0..60),
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one_of(":.;,"),
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digits,
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)),
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|(hours, _, minutes, _, seconds, sep, frames)| TimeCode {
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hours,
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minutes,
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seconds,
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frames,
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drop_frame: sep == ';' || sep == ',',
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},
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),
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)(s)
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}
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/// Parser that checks for EOF and optionally `\n` or `\r\n` before EOF
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fn end_of_line<'a, I: 'a>() -> impl Parser<I, Output = ()> + 'a
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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(
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optional(choice((range(b"\n".as_ref()), range(b"\r\n".as_ref())))),
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eof(),
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)
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.map(|_| ())
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.message("while parsing end of line")
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fn end_of_line(s: &[u8]) -> IResult<&[u8], ()> {
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use nom::branch::alt;
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use nom::bytes::complete::tag;
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use nom::combinator::{eof, map, opt};
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use nom::sequence::pair;
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map(pair(opt(alt((tag("\r\n"), tag("\n")))), eof), |_| ())(s)
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}
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/// Parser for the SCC header
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fn header<'a, I: 'a>() -> impl Parser<I, Output = SccLine> + 'a
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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(
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optional(range(&[0xEFu8, 0xBBu8, 0xBFu8][..])),
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range(b"Scenarist_SCC V1.0".as_ref()),
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end_of_line(),
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)
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.map(|_| SccLine::Header)
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.message("while parsing header")
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fn header(s: &[u8]) -> IResult<&[u8], SccLine> {
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use nom::bytes::complete::tag;
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use nom::combinator::{map, opt};
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use nom::error::context;
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use nom::sequence::tuple;
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context(
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"invalid header",
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map(
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tuple((
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opt(tag(&[0xEFu8, 0xBBu8, 0xBFu8][..])),
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tag("Scenarist_SCC V1.0"),
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end_of_line,
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)),
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|_| SccLine::Header,
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),
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)(s)
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}
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/// Parser that accepts only an empty line
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fn empty_line<'a, I: 'a>() -> impl Parser<I, Output = SccLine> + 'a
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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end_of_line()
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.map(|_| SccLine::Empty)
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.message("while parsing empty line")
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fn empty_line(s: &[u8]) -> IResult<&[u8], SccLine> {
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use nom::combinator::map;
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use nom::error::context;
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context("invalid empty line", map(end_of_line, |_| SccLine::Empty))(s)
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}
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/// A single SCC payload item. This is ASCII hex encoded bytes.
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/// It returns an tuple of `(u8, u8)` of the hex encoded bytes.
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fn scc_payload_item<'a, I: 'a>() -> impl Parser<I, Output = (u8, u8)>
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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((hex_digit(), hex_digit(), hex_digit(), hex_digit()).map(|(u, l, m, n)| {
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let hex_to_u8 = |v: u8| match v {
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v if v >= b'0' && v <= b'9' => v - b'0',
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v if v >= b'A' && v <= b'F' => 10 + v - b'A',
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v if v >= b'a' && v <= b'f' => 10 + v - b'a',
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_ => unreachable!(),
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};
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let val = (hex_to_u8(u) << 4) | hex_to_u8(l);
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let val2 = (hex_to_u8(m) << 4) | hex_to_u8(n);
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(val, val2)
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}))
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.message("while parsing SCC payload")
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}
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fn scc_payload_item(s: &[u8]) -> IResult<&[u8], (u8, u8)> {
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use nom::bytes::complete::take_while_m_n;
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use nom::character::is_hex_digit;
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use nom::combinator::map;
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use nom::error::context;
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/// A wrapper around `Vec<u8>` that implements `Extend` in a special way. It can be
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/// extended from a `(u8, u8)` while the default `Extend` implementation for
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/// `Vec` only allows to extend over vector items.
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struct VecExtend(Vec<u8>);
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context(
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"invalid SCC payload item",
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map(take_while_m_n(4, 4, is_hex_digit), |s: &[u8]| {
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let hex_to_u8 = |v: u8| match v {
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v if v >= b'0' && v <= b'9' => v - b'0',
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v if v >= b'A' && v <= b'F' => 10 + v - b'A',
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v if v >= b'a' && v <= b'f' => 10 + v - b'a',
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_ => unreachable!(),
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};
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impl Default for VecExtend {
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fn default() -> Self {
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VecExtend(Vec::with_capacity(256))
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}
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}
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let val1 = (hex_to_u8(s[0]) << 4) | hex_to_u8(s[1]);
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let val2 = (hex_to_u8(s[2]) << 4) | hex_to_u8(s[3]);
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impl Extend<(u8, u8)> for VecExtend {
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fn extend<T>(&mut self, iter: T)
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where
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T: IntoIterator<Item = (u8, u8)>,
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{
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for (item, item2) in iter {
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self.0.extend_from_slice(&[item, item2]);
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}
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}
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(val1, val2)
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}),
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)(s)
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}
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/// Parser for the whole SCC payload with conversion to the underlying byte values.
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fn scc_payload<'a, I: 'a>() -> impl Parser<I, Output = Vec<u8>> + 'a
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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many1(
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(
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scc_payload_item(),
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choice!(token(b' ').map(|_| ()), end_of_line()),
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)
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.map(|v| v.0),
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)
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.map(|v: VecExtend| v.0)
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.message("while parsing SCC payloads")
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fn scc_payload(s: &[u8]) -> IResult<&[u8], Vec<u8>> {
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use nom::branch::alt;
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use nom::bytes::complete::tag;
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use nom::combinator::map;
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use nom::error::context;
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use nom::multi::fold_many1;
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use nom::sequence::pair;
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use nom::Parser;
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let parse_item = map(
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pair(scc_payload_item, alt((tag(" ").map(|_| ()), end_of_line))),
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|(item, _)| item,
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);
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context(
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"invalid SCC payload",
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fold_many1(parse_item, Vec::new(), |mut acc: Vec<_>, item| {
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acc.push(item.0);
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acc.push(item.1);
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acc
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}),
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)(s)
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}
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/// Parser for a SCC caption line in the form `timecode\tpayload`.
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fn caption<'a, I: 'a>() -> impl Parser<I, Output = SccLine> + 'a
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where
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I: RangeStream<Token = u8, Range = &'a [u8]>,
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I::Error: ParseError<I::Token, I::Range, I::Position>,
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{
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(timecode(), token(b'\t'), scc_payload(), end_of_line())
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.map(|(tc, _, value, _)| SccLine::Caption(tc, value))
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.message("while parsing caption")
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fn caption(s: &[u8]) -> IResult<&[u8], SccLine> {
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use nom::bytes::complete::tag;
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use nom::combinator::map;
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use nom::error::context;
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use nom::sequence::tuple;
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context(
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"invalid SCC caption line",
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map(
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tuple((timecode, tag("\t"), scc_payload, end_of_line)),
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|(tc, _, value, _)| SccLine::Caption(tc, value),
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),
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)(s)
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}
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/// SCC parser the parses line-by-line and keeps track of the current state in the file.
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@ -226,26 +219,34 @@ impl SccParser {
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pub fn parse_line<'a>(
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&mut self,
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line: &'a [u8],
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) -> Result<SccLine, combine::easy::ParseError<&'a [u8]>> {
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) -> Result<SccLine, nom::error::Error<&'a [u8]>> {
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use nom::branch::alt;
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match self.state {
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State::Header => header()
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.message("while in Header state")
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.easy_parse(line)
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State::Header => header(line)
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.map(|v| {
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self.state = State::Empty;
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v.0
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v.1
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})
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.map_err(|err| match err {
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nom::Err::Incomplete(_) => unreachable!(),
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nom::Err::Error(e) | nom::Err::Failure(e) => e,
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}),
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State::Empty => empty_line()
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.message("while in Empty state")
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.easy_parse(line)
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State::Empty => empty_line(line)
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.map(|v| {
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self.state = State::CaptionOrEmpty;
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v.0
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v.1
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})
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.map_err(|err| match err {
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nom::Err::Incomplete(_) => unreachable!(),
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nom::Err::Error(e) | nom::Err::Failure(e) => e,
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}),
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State::CaptionOrEmpty => alt((caption, empty_line))(line)
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.map(|v| v.1)
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.map_err(|err| match err {
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nom::Err::Incomplete(_) => unreachable!(),
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nom::Err::Error(e) | nom::Err::Failure(e) => e,
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}),
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State::CaptionOrEmpty => choice!(caption(), empty_line())
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.message("while in CaptionOrEmpty state")
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.easy_parse(line)
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.map(|v| v.0),
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}
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}
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}
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@ -253,14 +254,13 @@ impl SccParser {
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#[cfg(test)]
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mod tests {
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use super::*;
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use combine::error::UnexpectedParse;
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#[test]
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fn test_timecode() {
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let mut parser = timecode();
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assert_eq!(
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parser.parse(b"11:12:13;14".as_ref()),
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timecode(b"11:12:13;14".as_ref()),
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Ok((
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b"".as_ref(),
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TimeCode {
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hours: 11,
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minutes: 12,
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|
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@ -268,13 +268,13 @@ mod tests {
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frames: 14,
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drop_frame: true
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},
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b"".as_ref()
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))
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);
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assert_eq!(
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parser.parse(b"11:12:13:14".as_ref()),
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timecode(b"11:12:13:14".as_ref()),
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Ok((
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b"".as_ref(),
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TimeCode {
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hours: 11,
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minutes: 12,
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|
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@ -282,13 +282,13 @@ mod tests {
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frames: 14,
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drop_frame: false
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},
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b"".as_ref()
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))
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);
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assert_eq!(
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parser.parse(b"11:12:13:14abcd".as_ref()),
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timecode(b"11:12:13:14abcd".as_ref()),
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Ok((
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b"abcd".as_ref(),
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TimeCode {
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hours: 11,
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minutes: 12,
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|
|
@ -296,70 +296,73 @@ mod tests {
|
|||
frames: 14,
|
||||
drop_frame: false
|
||||
},
|
||||
b"abcd".as_ref()
|
||||
))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"abcd11:12:13:14".as_ref()),
|
||||
Err(UnexpectedParse::Unexpected)
|
||||
timecode(b"abcd11:12:13:14".as_ref()),
|
||||
Err(nom::Err::Error(nom::error::Error::new(
|
||||
b"abcd11:12:13:14".as_ref(),
|
||||
nom::error::ErrorKind::MapRes
|
||||
))),
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_header() {
|
||||
let mut parser = header();
|
||||
assert_eq!(
|
||||
parser.parse(b"Scenarist_SCC V1.0".as_ref()),
|
||||
Ok((SccLine::Header, b"".as_ref()))
|
||||
header(b"Scenarist_SCC V1.0".as_ref()),
|
||||
Ok((b"".as_ref(), SccLine::Header,))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"Scenarist_SCC V1.0\n".as_ref()),
|
||||
Ok((SccLine::Header, b"".as_ref()))
|
||||
header(b"Scenarist_SCC V1.0\n".as_ref()),
|
||||
Ok((b"".as_ref(), SccLine::Header))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"Scenarist_SCC V1.0\r\n".as_ref()),
|
||||
Ok((SccLine::Header, b"".as_ref()))
|
||||
header(b"Scenarist_SCC V1.0\r\n".as_ref()),
|
||||
Ok((b"".as_ref(), SccLine::Header))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"Scenarist_SCC V1.1".as_ref()),
|
||||
Err(UnexpectedParse::Unexpected)
|
||||
header(b"Scenarist_SCC V1.1".as_ref()),
|
||||
Err(nom::Err::Error(nom::error::Error::new(
|
||||
b"Scenarist_SCC V1.1".as_ref(),
|
||||
nom::error::ErrorKind::Tag
|
||||
))),
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_empty_line() {
|
||||
let mut parser = empty_line();
|
||||
assert_eq!(empty_line(b"".as_ref()), Ok((b"".as_ref(), SccLine::Empty)));
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"".as_ref()),
|
||||
Ok((SccLine::Empty, b"".as_ref()))
|
||||
empty_line(b"\n".as_ref()),
|
||||
Ok((b"".as_ref(), SccLine::Empty))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"\n".as_ref()),
|
||||
Ok((SccLine::Empty, b"".as_ref()))
|
||||
empty_line(b"\r\n".as_ref()),
|
||||
Ok((b"".as_ref(), SccLine::Empty))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"\r\n".as_ref()),
|
||||
Ok((SccLine::Empty, b"".as_ref()))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b" \r\n".as_ref()),
|
||||
Err(UnexpectedParse::Unexpected)
|
||||
empty_line(b" \r\n".as_ref()),
|
||||
Err(nom::Err::Error(nom::error::Error::new(
|
||||
b" \r\n".as_ref(),
|
||||
nom::error::ErrorKind::Eof
|
||||
))),
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_caption() {
|
||||
let mut parser = caption();
|
||||
assert_eq!(
|
||||
parser.parse(b"01:02:53:14\t94ae 94ae 9420 9420 947a 947a 97a2 97a2 a820 68ef f26e 2068 ef6e 6be9 6e67 2029 942c 942c 8080 8080 942f 942f".as_ref()),
|
||||
caption(b"01:02:53:14\t94ae 94ae 9420 9420 947a 947a 97a2 97a2 a820 68ef f26e 2068 ef6e 6be9 6e67 2029 942c 942c 8080 8080 942f 942f".as_ref()),
|
||||
Ok((
|
||||
b"".as_ref(),
|
||||
SccLine::Caption(
|
||||
TimeCode {
|
||||
hours: 1,
|
||||
|
|
@ -376,13 +379,13 @@ mod tests {
|
|||
0x94, 0x2f,
|
||||
]
|
||||
),
|
||||
b"".as_ref()
|
||||
))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"01:02:55;14 942c 942c".as_ref()),
|
||||
caption(b"01:02:55;14 942c 942c".as_ref()),
|
||||
Ok((
|
||||
b"".as_ref(),
|
||||
SccLine::Caption(
|
||||
TimeCode {
|
||||
hours: 1,
|
||||
|
|
@ -393,13 +396,13 @@ mod tests {
|
|||
},
|
||||
vec![0x94, 0x2c, 0x94, 0x2c]
|
||||
),
|
||||
b"".as_ref()
|
||||
))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"01:03:27:29 94ae 94ae 9420 9420 94f2 94f2 c845 d92c 2054 c845 5245 ae80 942c 942c 8080 8080 942f 942f".as_ref()),
|
||||
caption(b"01:03:27:29 94ae 94ae 9420 9420 94f2 94f2 c845 d92c 2054 c845 5245 ae80 942c 942c 8080 8080 942f 942f".as_ref()),
|
||||
Ok((
|
||||
b"".as_ref(),
|
||||
SccLine::Caption(
|
||||
TimeCode {
|
||||
hours: 1,
|
||||
|
|
@ -414,13 +417,13 @@ mod tests {
|
|||
0x80, 0x80, 0x80, 0x80, 0x94, 0x2f, 0x94, 0x2f,
|
||||
]
|
||||
),
|
||||
b"".as_ref()
|
||||
))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"00:00:00;00\t942c 942c".as_ref()),
|
||||
caption(b"00:00:00;00\t942c 942c".as_ref()),
|
||||
Ok((
|
||||
b"".as_ref(),
|
||||
SccLine::Caption(
|
||||
TimeCode {
|
||||
hours: 0,
|
||||
|
|
@ -431,13 +434,13 @@ mod tests {
|
|||
},
|
||||
vec![0x94, 0x2c, 0x94, 0x2c],
|
||||
),
|
||||
b"".as_ref()
|
||||
))
|
||||
);
|
||||
|
||||
assert_eq!(
|
||||
parser.parse(b"00:00:00;00\t942c 942c\r\n".as_ref()),
|
||||
caption(b"00:00:00;00\t942c 942c\r\n".as_ref()),
|
||||
Ok((
|
||||
b"".as_ref(),
|
||||
SccLine::Caption(
|
||||
TimeCode {
|
||||
hours: 0,
|
||||
|
|
@ -448,7 +451,6 @@ mod tests {
|
|||
},
|
||||
vec![0x94, 0x2c, 0x94, 0x2c],
|
||||
),
|
||||
b"".as_ref()
|
||||
))
|
||||
);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue