mirror of
https://github.com/sile/hls_m3u8.git
synced 2024-04-29 23:29:01 +00:00
173 lines
4.3 KiB
Rust
173 lines
4.3 KiB
Rust
use std::fmt;
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use std::ops::{Deref, DerefMut};
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use std::str::FromStr;
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use crate::types::{ByteRange, ProtocolVersion, RequiredVersion};
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use crate::utils::tag;
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use crate::Error;
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/// # [4.4.2.2. EXT-X-BYTERANGE]
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///
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/// The [ExtXByteRange] tag indicates that a [Media Segment] is a sub-range
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/// of the resource identified by its `URI`.
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///
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/// Its format is:
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/// ```text
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/// #EXT-X-BYTERANGE:<n>[@<o>]
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/// ```
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///
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/// where `n` is a [usize] indicating the length of the sub-range in bytes.
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/// If present, `o` is a [usize] indicating the start of the sub-range,
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/// as a byte offset from the beginning of the resource.
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///
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/// [Media Segment]: crate::MediaSegment
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/// [4.4.2.2. EXT-X-BYTERANGE]:
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/// https://tools.ietf.org/html/draft-pantos-hls-rfc8216bis-04#section-4.4.2.2
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub struct ExtXByteRange(ByteRange);
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impl ExtXByteRange {
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pub(crate) const PREFIX: &'static str = "#EXT-X-BYTERANGE:";
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/// Makes a new [ExtXByteRange] tag.
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///
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/// # Example
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/// ```
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/// # use hls_m3u8::tags::ExtXByteRange;
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/// let byte_range = ExtXByteRange::new(20, Some(5));
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/// ```
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pub const fn new(length: usize, start: Option<usize>) -> Self {
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Self(ByteRange::new(length, start))
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}
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/// Converts the [ExtXByteRange] to a [ByteRange].
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///
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/// # Example
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/// ```
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/// # use hls_m3u8::tags::ExtXByteRange;
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/// use hls_m3u8::types::ByteRange;
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///
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/// let byte_range = ExtXByteRange::new(20, Some(5));
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/// let range: ByteRange = byte_range.to_range();
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/// ```
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pub const fn to_range(&self) -> ByteRange {
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self.0
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}
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}
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impl RequiredVersion for ExtXByteRange {
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fn required_version(&self) -> ProtocolVersion {
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ProtocolVersion::V4
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}
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}
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impl Deref for ExtXByteRange {
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type Target = ByteRange;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl DerefMut for ExtXByteRange {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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impl fmt::Display for ExtXByteRange {
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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, "{}", self.0)?;
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Ok(())
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}
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}
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impl FromStr for ExtXByteRange {
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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 tokens = input.splitn(2, '@').collect::<Vec<_>>();
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if tokens.is_empty() {
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return Err(Error::invalid_input());
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}
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let length = tokens[0].parse()?;
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let start = {
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if tokens.len() == 2 {
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Some(tokens[1].parse()?)
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} else {
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None
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}
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};
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Ok(ExtXByteRange::new(length, start))
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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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let byte_range = ExtXByteRange::new(0, Some(5));
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assert_eq!(byte_range.to_string(), "#EXT-X-BYTERANGE:0@5".to_string());
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let byte_range = ExtXByteRange::new(99999, Some(2));
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assert_eq!(
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byte_range.to_string(),
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"#EXT-X-BYTERANGE:99999@2".to_string()
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);
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let byte_range = ExtXByteRange::new(99999, None);
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assert_eq!(byte_range.to_string(), "#EXT-X-BYTERANGE:99999".to_string());
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}
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#[test]
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fn test_parser() {
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let byte_range = ExtXByteRange::new(99999, Some(2));
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assert_eq!(
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byte_range,
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"#EXT-X-BYTERANGE:99999@2".parse::<ExtXByteRange>().unwrap()
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);
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let byte_range = ExtXByteRange::new(99999, None);
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assert_eq!(
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byte_range,
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"#EXT-X-BYTERANGE:99999".parse::<ExtXByteRange>().unwrap()
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);
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}
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#[test]
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fn test_deref() {
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let byte_range = ExtXByteRange::new(0, Some(22));
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assert_eq!(byte_range.length(), 0);
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assert_eq!(byte_range.start(), Some(22));
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}
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#[test]
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fn test_deref_mut() {
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let mut byte_range = ExtXByteRange::new(0, Some(22));
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byte_range.set_length(100);
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byte_range.set_start(Some(50));
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assert_eq!(byte_range.length(), 100);
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assert_eq!(byte_range.start(), Some(50));
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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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ExtXByteRange::new(20, Some(5)).required_version(),
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ProtocolVersion::V4
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);
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}
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}
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