mirror of
https://github.com/sile/hls_m3u8.git
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62 lines
1.7 KiB
Rust
62 lines
1.7 KiB
Rust
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use crate::types::ProtocolVersion;
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use crate::{Error, ErrorKind, Result};
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use std::fmt;
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use std::str::FromStr;
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use trackable::error::ErrorKindExt;
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/// [4.3.3.2. EXT-X-MEDIA-SEQUENCE]
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///
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/// [4.3.3.2. EXT-X-MEDIA-SEQUENCE]: https://tools.ietf.org/html/rfc8216#section-4.3.3.2
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub struct ExtXMediaSequence {
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seq_num: u64,
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}
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impl ExtXMediaSequence {
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pub(crate) const PREFIX: &'static str = "#EXT-X-MEDIA-SEQUENCE:";
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/// Makes a new `ExtXMediaSequence` tag.
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pub fn new(seq_num: u64) -> Self {
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ExtXMediaSequence { seq_num }
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}
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/// Returns the sequence number of the first media segment that appears in the associated playlist.
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pub fn seq_num(self) -> u64 {
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self.seq_num
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}
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/// Returns the protocol compatibility version that this tag requires.
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pub fn requires_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 ExtXMediaSequence {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}{}", Self::PREFIX, self.seq_num)
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}
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}
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impl FromStr for ExtXMediaSequence {
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type Err = Error;
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fn from_str(s: &str) -> Result<Self> {
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track_assert!(s.starts_with(Self::PREFIX), ErrorKind::InvalidInput);
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let seq_num = may_invalid!(s.split_at(Self::PREFIX.len()).1.parse())?;
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Ok(ExtXMediaSequence { seq_num })
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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 ext_x_media_sequence() {
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let tag = ExtXMediaSequence::new(123);
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let text = "#EXT-X-MEDIA-SEQUENCE:123";
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assert_eq!(text.parse().ok(), Some(tag));
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assert_eq!(tag.to_string(), text);
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assert_eq!(tag.requires_version(), ProtocolVersion::V1);
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}
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}
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