mirror of
https://github.com/sile/hls_m3u8.git
synced 2024-04-29 23:29:01 +00:00
140 lines
3.7 KiB
Rust
140 lines
3.7 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::{ByteRange, ProtocolVersion, RequiredVersion};
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use crate::utils::{quote, tag, unquote};
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use crate::Error;
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/// # [4.4.2.5. EXT-X-MAP]
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/// The [ExtXMap] tag specifies how to obtain the Media Initialization
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/// Section, required to parse the applicable [Media Segment]s.
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///
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/// Its format is:
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/// ```text
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/// #EXT-X-MAP:<attribute-list>
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/// ```
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///
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/// [Media Segment]: crate::MediaSegment
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/// [4.4.2.5. EXT-X-MAP]:
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/// https://tools.ietf.org/html/draft-pantos-hls-rfc8216bis-04#section-4.4.2.5
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub struct ExtXMap {
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uri: String,
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range: Option<ByteRange>,
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}
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impl ExtXMap {
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pub(crate) const PREFIX: &'static str = "#EXT-X-MAP:";
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/// Makes a new `ExtXMap` tag.
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pub fn new<T: ToString>(uri: T) -> Self {
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ExtXMap {
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uri: uri.to_string(),
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range: None,
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}
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}
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/// Makes a new `ExtXMap` tag with the given range.
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pub fn with_range<T: ToString>(uri: T, range: ByteRange) -> Self {
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ExtXMap {
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uri: uri.to_string(),
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range: Some(range),
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}
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}
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/// Returns the URI that identifies a resource that contains the media initialization section.
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pub const fn uri(&self) -> &String {
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&self.uri
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}
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/// Returns the range of the media initialization section.
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pub const fn range(&self) -> Option<ByteRange> {
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self.range
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}
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}
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impl RequiredVersion for ExtXMap {
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fn required_version(&self) -> ProtocolVersion {
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ProtocolVersion::V6
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}
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}
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impl fmt::Display for ExtXMap {
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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, "URI={}", quote(&self.uri))?;
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if let Some(value) = &self.range {
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write!(f, ",BYTERANGE={}", quote(value))?;
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}
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Ok(())
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}
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}
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impl FromStr for ExtXMap {
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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 uri = None;
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let mut range = None;
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for (key, value) in input.parse::<AttributePairs>()? {
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match key.as_str() {
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"URI" => uri = Some(unquote(value)),
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"BYTERANGE" => {
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range = Some((unquote(value).parse())?);
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}
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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 uri = uri.ok_or_else(|| Error::missing_value("EXT-X-URI"))?;
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Ok(ExtXMap { uri, range })
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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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ExtXMap::new("foo").to_string(),
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"#EXT-X-MAP:URI=\"foo\"".to_string(),
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);
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assert_eq!(
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ExtXMap::with_range("foo", ByteRange::new(9, Some(2))).to_string(),
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"#EXT-X-MAP:URI=\"foo\",BYTERANGE=\"9@2\"".to_string(),
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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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ExtXMap::new("foo"),
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"#EXT-X-MAP:URI=\"foo\"".parse().unwrap()
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);
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assert_eq!(
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ExtXMap::with_range("foo", ByteRange::new(9, Some(2))),
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"#EXT-X-MAP:URI=\"foo\",BYTERANGE=\"9@2\"".parse().unwrap()
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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!(ExtXMap::new("foo").required_version(), ProtocolVersion::V6);
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assert_eq!(
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ExtXMap::with_range("foo", ByteRange::new(9, Some(2))).required_version(),
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ProtocolVersion::V6
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);
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}
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}
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