mirror of
https://github.com/sile/hls_m3u8.git
synced 2024-05-24 03:08:23 +00:00
164 lines
5.2 KiB
Rust
164 lines
5.2 KiB
Rust
use crate::attribute::AttributePairs;
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use crate::types::{DecimalResolution, HdcpLevel, ProtocolVersion, QuotedString};
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use crate::utils::parse_u64;
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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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/// [4.3.4.3. EXT-X-I-FRAME-STREAM-INF]
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///
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/// [4.3.4.3. EXT-X-I-FRAME-STREAM-INF]: https://tools.ietf.org/html/rfc8216#section-4.3.4.3
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub struct ExtXIFrameStreamInf {
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uri: QuotedString,
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bandwidth: u64,
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average_bandwidth: Option<u64>,
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codecs: Option<QuotedString>,
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resolution: Option<DecimalResolution>,
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hdcp_level: Option<HdcpLevel>,
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video: Option<QuotedString>,
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}
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impl ExtXIFrameStreamInf {
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pub(crate) const PREFIX: &'static str = "#EXT-X-I-FRAME-STREAM-INF:";
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/// Makes a new `ExtXIFrameStreamInf` tag.
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pub fn new(uri: QuotedString, bandwidth: u64) -> Self {
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ExtXIFrameStreamInf {
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uri,
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bandwidth,
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average_bandwidth: None,
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codecs: None,
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resolution: None,
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hdcp_level: None,
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video: None,
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}
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}
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/// Returns the URI that identifies the associated media playlist.
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pub fn uri(&self) -> &QuotedString {
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&self.uri
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}
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/// Returns the peak segment bit rate of the variant stream.
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pub fn bandwidth(&self) -> u64 {
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self.bandwidth
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}
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/// Returns the average segment bit rate of the variant stream.
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pub fn average_bandwidth(&self) -> Option<u64> {
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self.average_bandwidth
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}
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/// Returns a string that represents the list of codec types contained the variant stream.
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pub fn codecs(&self) -> Option<&QuotedString> {
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self.codecs.as_ref()
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}
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/// Returns the optimal pixel resolution at which to display all the video in the variant stream.
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pub fn resolution(&self) -> Option<DecimalResolution> {
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self.resolution
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}
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/// Returns the HDCP level of the variant stream.
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pub fn hdcp_level(&self) -> Option<HdcpLevel> {
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self.hdcp_level
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}
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/// Returns the group identifier for the video in the variant stream.
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pub fn video(&self) -> Option<&QuotedString> {
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self.video.as_ref()
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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 ExtXIFrameStreamInf {
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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={}", self.uri)?;
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write!(f, ",BANDWIDTH={}", self.bandwidth)?;
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if let Some(ref x) = self.average_bandwidth {
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write!(f, ",AVERAGE-BANDWIDTH={}", x)?;
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}
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if let Some(ref x) = self.codecs {
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write!(f, ",CODECS={}", x)?;
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}
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if let Some(ref x) = self.resolution {
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write!(f, ",RESOLUTION={}", x)?;
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}
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if let Some(ref x) = self.hdcp_level {
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write!(f, ",HDCP-LEVEL={}", x)?;
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}
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if let Some(ref x) = self.video {
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write!(f, ",VIDEO={}", x)?;
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}
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Ok(())
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}
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}
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impl FromStr for ExtXIFrameStreamInf {
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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 mut uri = None;
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let mut bandwidth = None;
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let mut average_bandwidth = None;
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let mut codecs = None;
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let mut resolution = None;
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let mut hdcp_level = None;
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let mut video = None;
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let attrs = AttributePairs::parse(s.split_at(Self::PREFIX.len()).1);
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for attr in attrs {
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let (key, value) = track!(attr)?;
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match key {
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"URI" => uri = Some(track!(value.parse())?),
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"BANDWIDTH" => bandwidth = Some(track!(parse_u64(value))?),
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"AVERAGE-BANDWIDTH" => average_bandwidth = Some(track!(parse_u64(value))?),
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"CODECS" => codecs = Some(track!(value.parse())?),
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"RESOLUTION" => resolution = Some(track!(value.parse())?),
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"HDCP-LEVEL" => hdcp_level = Some(track!(value.parse())?),
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"VIDEO" => video = Some(track!(value.parse())?),
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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 = track_assert_some!(uri, ErrorKind::InvalidInput);
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let bandwidth = track_assert_some!(bandwidth, ErrorKind::InvalidInput);
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Ok(ExtXIFrameStreamInf {
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uri,
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bandwidth,
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average_bandwidth,
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codecs,
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resolution,
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hdcp_level,
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video,
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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 ext_x_i_frame_stream_inf() {
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let tag = ExtXIFrameStreamInf::new(quoted_string("foo"), 1000);
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let text = r#"#EXT-X-I-FRAME-STREAM-INF:URI="foo",BANDWIDTH=1000"#;
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assert_eq!(text.parse().ok(), Some(tag.clone()));
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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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fn quoted_string(s: &str) -> QuotedString {
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QuotedString::new(s).unwrap()
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}
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}
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