mirror of
https://github.com/sile/hls_m3u8.git
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152 lines
4 KiB
Rust
152 lines
4 KiB
Rust
use std::fmt;
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use std::str::FromStr;
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use crate::attribute::AttributePairs;
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use crate::types::{ProtocolVersion, RequiredVersion, SignedDecimalFloatingPoint};
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use crate::utils::{parse_yes_or_no, tag};
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use crate::Error;
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/// [4.3.5.2. EXT-X-START]
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///
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/// [4.3.5.2. EXT-X-START]: https://tools.ietf.org/html/rfc8216#section-4.3.5.2
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub struct ExtXStart {
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time_offset: SignedDecimalFloatingPoint,
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precise: bool,
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}
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impl ExtXStart {
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pub(crate) const PREFIX: &'static str = "#EXT-X-START:";
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/// Makes a new `ExtXStart` tag.
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///
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/// # Panic
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/// Panics if the time_offset value is infinite.
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pub fn new(time_offset: f64) -> Self {
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if time_offset.is_infinite() {
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panic!("EXT-X-START: Floating point value must be finite!");
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}
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ExtXStart {
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time_offset: SignedDecimalFloatingPoint::new(time_offset).unwrap(),
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precise: false,
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}
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}
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/// Makes a new `ExtXStart` tag with the given `precise` flag.
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///
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/// # Panic
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/// Panics if the time_offset value is infinite.
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pub fn with_precise(time_offset: f64, precise: bool) -> Self {
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if time_offset.is_infinite() {
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panic!("EXT-X-START: Floating point value must be finite!");
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}
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ExtXStart {
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time_offset: SignedDecimalFloatingPoint::new(time_offset).unwrap(),
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precise,
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}
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}
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/// Returns the time offset of the media segments in the playlist.
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pub const fn time_offset(&self) -> f64 {
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self.time_offset.as_f64()
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}
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/// Returns whether clients should not render media stream whose presentation times are
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/// prior to the specified time offset.
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pub const fn precise(&self) -> bool {
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self.precise
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}
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}
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impl RequiredVersion for ExtXStart {
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fn required_version(&self) -> ProtocolVersion {
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ProtocolVersion::V1
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}
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}
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impl fmt::Display for ExtXStart {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", Self::PREFIX)?;
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write!(f, "TIME-OFFSET={}", self.time_offset)?;
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if self.precise {
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write!(f, ",PRECISE=YES")?;
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}
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Ok(())
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}
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}
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impl FromStr for ExtXStart {
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type Err = Error;
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fn from_str(input: &str) -> Result<Self, Self::Err> {
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let input = tag(input, Self::PREFIX)?;
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let mut time_offset = None;
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let mut precise = false;
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for (key, value) in input.parse::<AttributePairs>()? {
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match key.as_str() {
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"TIME-OFFSET" => time_offset = Some((value.parse())?),
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"PRECISE" => precise = (parse_yes_or_no(value))?,
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_ => {
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// [6.3.1. General Client Responsibilities]
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// > ignore any attribute/value pair with an unrecognized AttributeName.
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}
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}
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}
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let time_offset = time_offset.ok_or(Error::missing_value("EXT-X-TIME-OFFSET"))?;
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Ok(ExtXStart {
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time_offset,
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precise,
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})
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_display() {
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assert_eq!(
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ExtXStart::new(-1.23).to_string(),
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"#EXT-X-START:TIME-OFFSET=-1.23".to_string(),
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);
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assert_eq!(
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ExtXStart::with_precise(1.23, true).to_string(),
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"#EXT-X-START:TIME-OFFSET=1.23,PRECISE=YES".to_string(),
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);
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}
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#[test]
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fn test_required_version() {
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assert_eq!(
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ExtXStart::new(-1.23).required_version(),
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ProtocolVersion::V1,
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);
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assert_eq!(
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ExtXStart::with_precise(1.23, true).required_version(),
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ProtocolVersion::V1,
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);
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}
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#[test]
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fn test_parser() {
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assert_eq!(
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ExtXStart::new(-1.23),
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"#EXT-X-START:TIME-OFFSET=-1.23".parse().unwrap(),
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);
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assert_eq!(
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ExtXStart::with_precise(1.23, true),
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"#EXT-X-START:TIME-OFFSET=1.23,PRECISE=YES".parse().unwrap(),
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);
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}
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}
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