added media_playlist builder

src/error.rs

@@ -6,56 +6,63 @@ use failure::{Backtrace, Context, Fail};
 /// This crate specific `Result` type.
 pub type Result<T> = std::result::Result<T, Error>;
 
-#[derive(Debug, Fail, Clone)]
+/// The ErrorKind.
-pub enum AttributeError {
-    #[fail(display = "The attribute has an invalid name; {:?}", _0)]
-    InvalidAttribute(String),
-    #[fail(display = "A value is missing for the attribute: {}", _0)]
-    MissingValue(String),
-}
-
 #[derive(Debug, Fail, Clone)]
 pub enum ErrorKind {
-    #[fail(display = "AttributeError: {}", _0)]
-    AttributeError(AttributeError),
-
     #[fail(display = "UnknownError: {}", _0)]
+    /// An unknown error occured.
     UnknownError(String),
 
     #[fail(display = "A value is missing for the attribute {}", _0)]
+    /// A required value is missing.
     MissingValue(String),
 
     #[fail(display = "Invalid Input")]
+    /// Error for anything.
     InvalidInput,
 
     #[fail(display = "ParseIntError: {}", _0)]
+    /// Failed to parse a String to int.
     ParseIntError(String),
 
     #[fail(display = "ParseFloatError: {}", _0)]
+    /// Failed to parse a String to float.
     ParseFloatError(String),
 
     #[fail(display = "MissingTag: Expected {} at the start of {:?}", tag, input)]
-    MissingTag { tag: String, input: String },
+    /// A tag is missing, that is required at the start of the input.
+    MissingTag {
+        /// The required tag.
+        tag: String,
+        /// The unparsed input data.
+        input: String,
+    },
 
     #[fail(display = "CustomError: {}", _0)]
+    /// A custom error.
     Custom(String),
 
     #[fail(display = "Unmatched Group: {:?}", _0)]
+    /// Unmatched Group
     UnmatchedGroup(String),
 
     #[fail(display = "Unknown Protocol version: {:?}", _0)]
+    /// Unknown m3u8 version. This library supports up to ProtocolVersion 7.
     UnknownProtocolVersion(String),
 
     #[fail(display = "IoError: {}", _0)]
+    /// Some io error
     Io(String),
 
     #[fail(
         display = "VersionError: required_version: {:?}, specified_version: {:?}",
         _0, _1
     )]
+    /// This error occurs, if there is a ProtocolVersion mismatch.
     VersionError(String, String),
 
     #[fail(display = "BuilderError: {}", _0)]
+    /// An Error from a Builder.
     BuilderError(String),
 
     /// Hints that destructuring should not be exhaustive.
@@ -69,6 +76,7 @@ pub enum ErrorKind {
 }
 
 #[derive(Debug)]
+/// The Error type of this library.
 pub struct Error {
     inner: Context<ErrorKind>,
 }
@@ -101,33 +109,7 @@ impl From<Context<ErrorKind>> for Error {
     }
 }
 
-macro_rules! from_error {
-    ( $( $f:tt ),* ) => {
-        $(
-            impl From<$f> for ErrorKind {
-                fn from(value: $f) -> Self {
-                    Self::$f(value)
-                }
-            }
-        )*
-    }
-}
-
-from_error!(AttributeError);
-
 impl Error {
-    pub(crate) fn invalid_attribute<T: ToString>(value: T) -> Self {
-        Self::from(ErrorKind::from(AttributeError::InvalidAttribute(
-            value.to_string(),
-        )))
-    }
-
-    pub(crate) fn missing_attribute_value<T: ToString>(value: T) -> Self {
-        Self::from(ErrorKind::from(AttributeError::MissingValue(
-            value.to_string(),
-        )))
-    }
-
     pub(crate) fn unknown<T>(value: T) -> Self
     where
         T: error::Error,
@@ -197,19 +179,19 @@ impl Error {
     }
 }
 
-impl From<std::num::ParseIntError> for Error {
+impl From<::std::num::ParseIntError> for Error {
     fn from(value: ::std::num::ParseIntError) -> Self {
         Error::parse_int_error(value)
     }
 }
 
-impl From<std::num::ParseFloatError> for Error {
+impl From<::std::num::ParseFloatError> for Error {
     fn from(value: ::std::num::ParseFloatError) -> Self {
         Error::parse_float_error(value)
     }
 }
 
-impl From<std::io::Error> for Error {
+impl From<::std::io::Error> for Error {
     fn from(value: ::std::io::Error) -> Self {
         Error::io(value)
     }

src/lib.rs

@@ -29,7 +29,7 @@
 
 pub use error::{Error, ErrorKind};
 pub use master_playlist::{MasterPlaylist, MasterPlaylistBuilder};
-pub use media_playlist::{MediaPlaylist, MediaPlaylistBuilder, MediaPlaylistOptions};
+pub use media_playlist::{MediaPlaylist, MediaPlaylistBuilder};
 pub use media_segment::{MediaSegment, MediaSegmentBuilder};
 
 pub mod tags;

src/master_playlist.rs

@@ -1,5 +1,6 @@
 use std::collections::HashSet;
 use std::fmt;
+use std::iter;
 use std::str::FromStr;
 
 use derive_builder::Builder;
@@ -13,17 +14,34 @@ use crate::types::{ClosedCaptions, MediaType, ProtocolVersion};
 use crate::Error;
 
 /// Master playlist.
-#[derive(Debug, Clone, Builder, Default)]
+#[derive(Debug, Clone, Builder)]
 #[builder(build_fn(validate = "Self::validate"))]
-#[builder(setter(into, strip_option), default)]
+#[builder(setter(into, strip_option))]
 pub struct MasterPlaylist {
+    #[builder(default, setter(name = "version"))]
+    /// Sets the protocol compatibility version of the resulting playlist.
+    ///
+    /// If the resulting playlist has tags which requires a compatibility version greater than
+    /// `version`,
+    /// `build()` method will fail with an `ErrorKind::InvalidInput` error.
+    ///
+    /// The default is the maximum version among the tags in the playlist.
     version_tag: ExtXVersion,
+    #[builder(default)]
+    /// Sets the [ExtXIndependentSegments] tag.
     independent_segments_tag: Option<ExtXIndependentSegments>,
+    #[builder(default)]
+    /// Sets the [ExtXStart] tag.
     start_tag: Option<ExtXStart>,
+    /// Sets the [ExtXMedia] tag.
     media_tags: Vec<ExtXMedia>,
+    /// Sets all [ExtXStreamInf]s.
     stream_inf_tags: Vec<ExtXStreamInf>,
+    /// Sets all [ExtXIFrameStreamInf]s.
     i_frame_stream_inf_tags: Vec<ExtXIFrameStreamInf>,
+    /// Sets all [ExtXSessionData]s.
     session_data_tags: Vec<ExtXSessionData>,
+    /// Sets all [ExtXSessionKey]s.
     session_key_tags: Vec<ExtXSessionKey>,
 }
 
@@ -75,30 +93,100 @@ impl MasterPlaylist {
 }
 
 impl MasterPlaylistBuilder {
-    pub(crate) fn validate(&self) -> Result<(), String> {
+    fn validate(&self) -> Result<(), String> {
-        // validate stream inf tags
+        let required_version = self.required_version();
-        if let Some(stream_inf_tags) = &self.stream_inf_tags {
+        let specified_version = self
+            .version_tag
+            .unwrap_or(required_version.into())
+            .version();
+
+        if required_version > specified_version {
+            return Err(Error::required_version(required_version, specified_version).to_string());
+        }
+
+        self.validate_stream_inf_tags().map_err(|e| e.to_string())?;
+        self.validate_i_frame_stream_inf_tags()
+            .map_err(|e| e.to_string())?;
+        self.validate_session_data_tags()
+            .map_err(|e| e.to_string())?;
+        self.validate_session_key_tags()
+            .map_err(|e| e.to_string())?;
+
+        Ok(())
+    }
+
+    fn required_version(&self) -> ProtocolVersion {
+        iter::empty()
+            .chain(
+                self.independent_segments_tag
+                    .iter()
+                    .map(|t| t.iter().map(|t| t.requires_version()))
+                    .flatten(),
+            )
+            .chain(
+                self.start_tag
+                    .iter()
+                    .map(|t| t.iter().map(|t| t.requires_version()))
+                    .flatten(),
+            )
+            .chain(
+                self.media_tags
+                    .iter()
+                    .map(|t| t.iter().map(|t| t.requires_version()))
+                    .flatten(),
+            )
+            .chain(
+                self.stream_inf_tags
+                    .iter()
+                    .map(|t| t.iter().map(|t| t.requires_version()))
+                    .flatten(),
+            )
+            .chain(
+                self.i_frame_stream_inf_tags
+                    .iter()
+                    .map(|t| t.iter().map(|t| t.requires_version()))
+                    .flatten(),
+            )
+            .chain(
+                self.session_data_tags
+                    .iter()
+                    .map(|t| t.iter().map(|t| t.requires_version()))
+                    .flatten(),
+            )
+            .chain(
+                self.session_key_tags
+                    .iter()
+                    .map(|t| t.iter().map(|t| t.requires_version()))
+                    .flatten(),
+            )
+            .max()
+            .unwrap_or(ProtocolVersion::V7)
+    }
+
+    fn validate_stream_inf_tags(&self) -> crate::Result<()> {
+        if let Some(value) = &self.stream_inf_tags {
             let mut has_none_closed_captions = false;
-            for t in stream_inf_tags {
+
+            for t in value {
                 if let Some(group_id) = t.audio() {
                     if !self.check_media_group(MediaType::Audio, group_id) {
-                        return Err(Error::unmatched_group(group_id).to_string());
+                        return Err(Error::unmatched_group(group_id));
                     }
                 }
                 if let Some(group_id) = t.video() {
                     if !self.check_media_group(MediaType::Video, group_id) {
-                        return Err(Error::unmatched_group(group_id).to_string());
+                        return Err(Error::unmatched_group(group_id));
                     }
                 }
                 if let Some(group_id) = t.subtitles() {
                     if !self.check_media_group(MediaType::Subtitles, group_id) {
-                        return Err(Error::unmatched_group(group_id).to_string());
+                        return Err(Error::unmatched_group(group_id));
                     }
                 }
                 match t.closed_captions() {
                     Some(&ClosedCaptions::GroupId(ref group_id)) => {
                         if !self.check_media_group(MediaType::ClosedCaptions, group_id) {
-                            return Err(Error::unmatched_group(group_id).to_string());
+                            return Err(Error::unmatched_group(group_id));
                         }
                     }
                     Some(&ClosedCaptions::None) => {
@@ -108,53 +196,57 @@ impl MasterPlaylistBuilder {
                 }
             }
             if has_none_closed_captions {
-                if !stream_inf_tags
+                if !value
                     .iter()
                     .all(|t| t.closed_captions() == Some(&ClosedCaptions::None))
                 {
-                    return Err(Error::invalid_input().to_string());
+                    return Err(Error::invalid_input());
                 }
             }
         }
+        Ok(())
+    }
 
-        // validate i_frame_stream_inf_tags
+    fn validate_i_frame_stream_inf_tags(&self) -> crate::Result<()> {
-        if let Some(i_frame_stream_inf_tags) = &self.i_frame_stream_inf_tags {
+        if let Some(value) = &self.i_frame_stream_inf_tags {
-            for t in i_frame_stream_inf_tags {
+            for t in value {
                 if let Some(group_id) = t.video() {
                     if !self.check_media_group(MediaType::Video, group_id) {
-                        return Err(Error::unmatched_group(group_id).to_string());
+                        return Err(Error::unmatched_group(group_id));
                     }
                 }
             }
         }
+        Ok(())
+    }
 
-        // validate session_data_tags
+    fn validate_session_data_tags(&self) -> crate::Result<()> {
-        if let Some(session_data_tags) = &self.session_data_tags {
         let mut set = HashSet::new();
-
+        if let Some(value) = &self.session_data_tags {
-            for t in session_data_tags {
+            for t in value {
                 if !set.insert((t.data_id(), t.language())) {
-                    return Err(Error::custom(format!("Conflict: {}", t)).to_string());
+                    return Err(Error::custom(format!("Conflict: {}", t)));
                 }
             }
         }
+        Ok(())
+    }
 
-        // validate session_key_tags
+    fn validate_session_key_tags(&self) -> crate::Result<()> {
-        if let Some(session_key_tags) = &self.session_key_tags {
         let mut set = HashSet::new();
-            for t in session_key_tags {
+        if let Some(value) = &self.session_key_tags {
+            for t in value {
                 if !set.insert(t.key()) {
-                    return Err(Error::custom(format!("Conflict: {}", t)).to_string());
+                    return Err(Error::custom(format!("Conflict: {}", t)));
                 }
             }
         }
-
         Ok(())
     }
 
     fn check_media_group<T: ToString>(&self, media_type: MediaType, group_id: T) -> bool {
-        if let Some(media_tags) = &self.media_tags {
+        if let Some(value) = &self.media_tags {
-            media_tags
+            value
                 .iter()
                 .any(|t| t.media_type() == media_type && t.group_id() == &group_id.to_string())
         } else {
@@ -220,7 +312,7 @@ impl FromStr for MasterPlaylist {
                             return Err(Error::invalid_input());
                         }
                         Tag::ExtXVersion(t) => {
-                            builder.version_tag(t.version());
+                            builder.version(t.version());
                         }
                         Tag::ExtInf(_)
                         | Tag::ExtXByteRange(_)
@@ -235,7 +327,10 @@ impl FromStr for MasterPlaylist {
                         | Tag::ExtXEndList(_)
                         | Tag::ExtXPlaylistType(_)
                         | Tag::ExtXIFramesOnly(_) => {
-                            return Err(Error::invalid_input()); // TODO: why?
+                            return Err(Error::custom(format!(
+                                "This tag isn't allowed in a master playlist: {}",
+                                tag
+                            )));
                         }
                         Tag::ExtXMedia(t) => {
                             media_tags.push(t);
@@ -258,7 +353,7 @@ impl FromStr for MasterPlaylist {
                         Tag::ExtXStart(t) => {
                             builder.start_tag(t);
                         }
-                        Tag::Unknown(_) => {
+                        _ => {
                             // [6.3.1. General Client Responsibilities]
                             // > ignore any unrecognized tags.
                             // TODO: collect custom tags

src/media_playlist.rs

@@ -3,123 +3,96 @@ use std::iter;
 use std::str::FromStr;
 use std::time::Duration;
 
+use derive_builder::Builder;
+
 use crate::line::{Line, Lines, Tag};
 use crate::media_segment::{MediaSegment, MediaSegmentBuilder};
 use crate::tags::{
     ExtM3u, ExtXDiscontinuitySequence, ExtXEndList, ExtXIFramesOnly, ExtXIndependentSegments,
     ExtXMediaSequence, ExtXPlaylistType, ExtXStart, ExtXTargetDuration, ExtXVersion,
-    MediaPlaylistTag,
 };
 use crate::types::ProtocolVersion;
 use crate::Error;
 
-/// Media playlist builder.
+/// Media playlist.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Builder)]
-pub struct MediaPlaylistBuilder {
+#[builder(build_fn(validate = "Self::validate"))]
-    version: Option<ProtocolVersion>,
+#[builder(setter(into, strip_option))]
-    target_duration_tag: Option<ExtXTargetDuration>,
+pub struct MediaPlaylist {
+    /// Sets the protocol compatibility version of the resulting playlist.
+    ///
+    /// If the resulting playlist has tags which requires a compatibility
+    /// version greater than `version`,
+    /// `build()` method will fail with an `ErrorKind::InvalidInput` error.
+    ///
+    /// The default is the maximum version among the tags in the playlist.
+    #[builder(setter(name = "version"))]
+    version_tag: ExtXVersion,
+    /// Sets the [ExtXTargetDuration] tag.
+    target_duration_tag: ExtXTargetDuration,
+    #[builder(default)]
+    /// Sets the [ExtXMediaSequence] tag.
     media_sequence_tag: Option<ExtXMediaSequence>,
+    #[builder(default)]
+    /// Sets the [ExtXDiscontinuitySequence] tag.
     discontinuity_sequence_tag: Option<ExtXDiscontinuitySequence>,
+    #[builder(default)]
+    /// Sets the [ExtXPlaylistType] tag.
     playlist_type_tag: Option<ExtXPlaylistType>,
+    #[builder(default)]
+    /// Sets the [ExtXIFramesOnly] tag.
     i_frames_only_tag: Option<ExtXIFramesOnly>,
+    #[builder(default)]
+    /// Sets the [ExtXIndependentSegments] tag.
     independent_segments_tag: Option<ExtXIndependentSegments>,
+    #[builder(default)]
+    /// Sets the [ExtXStart] tag.
     start_tag: Option<ExtXStart>,
+    #[builder(default)]
+    /// Sets the [ExtXEndList] tag.
     end_list_tag: Option<ExtXEndList>,
+    /// Sets all [MediaSegment]s.
     segments: Vec<MediaSegment>,
-    options: MediaPlaylistOptions,
+    /// Sets the allowable excess duration of each media segment in the associated playlist.
+    ///
+    /// # Error
+    /// If there is a media segment of which duration exceeds
+    /// `#EXT-X-TARGETDURATION + allowable_excess_duration`,
+    /// the invocation of `MediaPlaylistBuilder::build()` method will fail.
+    ///
+    /// The default value is `Duration::from_secs(0)`.
+    #[builder(default = "Duration::from_secs(0)")]
+    allowable_excess_duration: Duration,
 }
 
 impl MediaPlaylistBuilder {
-    /// Makes a new `MediaPlaylistBuilder` instance.
+    fn validate(&self) -> Result<(), String> {
-    pub fn new() -> Self {
-        MediaPlaylistBuilder {
-            version: None,
-            target_duration_tag: None,
-            media_sequence_tag: None,
-            discontinuity_sequence_tag: None,
-            playlist_type_tag: None,
-            i_frames_only_tag: None,
-            independent_segments_tag: None,
-            start_tag: None,
-            end_list_tag: None,
-            segments: Vec::new(),
-            options: MediaPlaylistOptions::new(),
-        }
-    }
-
-    /// Sets the protocol compatibility version of the resulting playlist.
-    ///
-    /// If the resulting playlist has tags which requires a compatibility version greater than `version`,
-    /// `finish()` method will fail with an `ErrorKind::InvalidInput` error.
-    ///
-    /// The default is the maximum version among the tags in the playlist.
-    pub fn version(&mut self, version: ProtocolVersion) -> &mut Self {
-        self.version = Some(version);
-        self
-    }
-
-    /// Sets the given tag to the resulting playlist.
-    pub fn tag<T: Into<MediaPlaylistTag>>(&mut self, tag: T) -> &mut Self {
-        match tag.into() {
-            MediaPlaylistTag::ExtXTargetDuration(t) => self.target_duration_tag = Some(t),
-            MediaPlaylistTag::ExtXMediaSequence(t) => self.media_sequence_tag = Some(t),
-            MediaPlaylistTag::ExtXDiscontinuitySequence(t) => {
-                self.discontinuity_sequence_tag = Some(t)
-            }
-            MediaPlaylistTag::ExtXPlaylistType(t) => self.playlist_type_tag = Some(t),
-            MediaPlaylistTag::ExtXIFramesOnly(t) => self.i_frames_only_tag = Some(t),
-            MediaPlaylistTag::ExtXIndependentSegments(t) => self.independent_segments_tag = Some(t),
-            MediaPlaylistTag::ExtXStart(t) => self.start_tag = Some(t),
-            MediaPlaylistTag::ExtXEndList(t) => self.end_list_tag = Some(t),
-        }
-        self
-    }
-
-    /// Adds a media segment to the resulting playlist.
-    pub fn segment(&mut self, segment: MediaSegment) -> &mut Self {
-        self.segments.push(segment);
-        self
-    }
-
-    /// Sets the options that will be associated to the resulting playlist.
-    ///
-    /// The default value is `MediaPlaylistOptions::default()`.
-    pub fn options(&mut self, options: MediaPlaylistOptions) -> &mut Self {
-        self.options = options;
-        self
-    }
-
-    /// Builds a `MediaPlaylist` instance.
-    pub fn finish(self) -> crate::Result<MediaPlaylist> {
         let required_version = self.required_version();
-        let specified_version = self.version.unwrap_or(required_version);
+        let specified_version = self
-        if !(required_version <= specified_version) {
+            .version_tag
+            .unwrap_or(required_version.into())
+            .version();
+
+        if required_version > specified_version {
             return Err(Error::custom(format!(
                 "required_version: {}, specified_version: {}",
                 required_version, specified_version
-            )));
+            ))
+            .to_string());
         }
 
-        let target_duration_tag = self.target_duration_tag.ok_or(Error::invalid_input())?;
+        if let Some(target_duration) = &self.target_duration_tag {
-        self.validate_media_segments(target_duration_tag.duration())?;
+            self.validate_media_segments(target_duration.duration())
+                .map_err(|e| e.to_string())?;
+        }
 
-        Ok(MediaPlaylist {
+        Ok(())
-            version_tag: ExtXVersion::new(specified_version),
-            target_duration_tag,
-            media_sequence_tag: self.media_sequence_tag,
-            discontinuity_sequence_tag: self.discontinuity_sequence_tag,
-            playlist_type_tag: self.playlist_type_tag,
-            i_frames_only_tag: self.i_frames_only_tag,
-            independent_segments_tag: self.independent_segments_tag,
-            start_tag: self.start_tag,
-            end_list_tag: self.end_list_tag,
-            segments: self.segments,
-        })
     }
 
     fn validate_media_segments(&self, target_duration: Duration) -> crate::Result<()> {
         let mut last_range_uri = None;
-        for s in &self.segments {
+        if let Some(segments) = &self.segments {
+            for s in segments {
                 // CHECK: `#EXT-X-TARGETDURATION`
                 let segment_duration = s.inf_tag().duration();
                 let rounded_segment_duration = if segment_duration.subsec_nanos() < 500_000_000 {
@@ -127,7 +100,14 @@ impl MediaPlaylistBuilder {
                 } else {
                     Duration::from_secs(segment_duration.as_secs() + 1)
                 };
-            let max_segment_duration = target_duration + self.options.allowable_excess_duration;
+
+                let max_segment_duration = {
+                    if let Some(value) = &self.allowable_excess_duration {
+                        target_duration + *value
+                    } else {
+                        target_duration
+                    }
+                };
 
                 if !(rounded_segment_duration <= max_segment_duration) {
                     return Err(Error::custom(format!(
@@ -153,6 +133,7 @@ impl MediaPlaylistBuilder {
                     last_range_uri = None;
                 }
             }
+        }
         Ok(())
     }
 
@@ -163,49 +144,86 @@ impl MediaPlaylistBuilder {
                     .iter()
                     .map(|t| t.requires_version()),
             )
-            .chain(self.media_sequence_tag.iter().map(|t| t.requires_version()))
+            .chain(self.media_sequence_tag.iter().map(|t| {
-            .chain(
+                if let Some(p) = t {
-                self.discontinuity_sequence_tag
+                    p.requires_version()
-                    .iter()
+                } else {
-                    .map(|t| t.requires_version()),
+                    ProtocolVersion::V1
-            )
+                }
-            .chain(self.playlist_type_tag.iter().map(|t| t.requires_version()))
+            }))
-            .chain(self.i_frames_only_tag.iter().map(|t| t.requires_version()))
+            .chain(self.discontinuity_sequence_tag.iter().map(|t| {
-            .chain(
+                if let Some(p) = t {
-                self.independent_segments_tag
+                    p.requires_version()
-                    .iter()
+                } else {
-                    .map(|t| t.requires_version()),
+                    ProtocolVersion::V1
-            )
+                }
-            .chain(self.start_tag.iter().map(|t| t.requires_version()))
+            }))
-            .chain(self.end_list_tag.iter().map(|t| t.requires_version()))
+            .chain(self.playlist_type_tag.iter().map(|t| {
-            .chain(self.segments.iter().map(|s| s.requires_version()))
+                if let Some(p) = t {
+                    p.requires_version()
+                } else {
+                    ProtocolVersion::V1
+                }
+            }))
+            .chain(self.i_frames_only_tag.iter().map(|t| {
+                if let Some(p) = t {
+                    p.requires_version()
+                } else {
+                    ProtocolVersion::V1
+                }
+            }))
+            .chain(self.independent_segments_tag.iter().map(|t| {
+                if let Some(p) = t {
+                    p.requires_version()
+                } else {
+                    ProtocolVersion::V1
+                }
+            }))
+            .chain(self.start_tag.iter().map(|t| {
+                if let Some(p) = t {
+                    p.requires_version()
+                } else {
+                    ProtocolVersion::V1
+                }
+            }))
+            .chain(self.end_list_tag.iter().map(|t| {
+                if let Some(p) = t {
+                    p.requires_version()
+                } else {
+                    ProtocolVersion::V1
+                }
+            }))
+            .chain(self.segments.iter().map(|t| {
+                t.iter()
+                    .map(|s| s.requires_version())
+                    .max()
+                    .unwrap_or(ProtocolVersion::V1)
+            }))
             .max()
             .unwrap_or(ProtocolVersion::V1)
     }
+
+    /// Adds a media segment to the resulting playlist.
+    pub fn push_segment<VALUE: Into<MediaSegment>>(&mut self, value: VALUE) -> &mut Self {
+        if let Some(segments) = &mut self.segments {
+            segments.push(value.into());
+        } else {
+            self.segments = Some(vec![value.into()]);
+        }
+        self
     }
 
-impl Default for MediaPlaylistBuilder {
+    /// Parse the rest of the [MediaPlaylist] from an m3u8 file.
-    fn default() -> Self {
+    pub fn parse(&mut self, input: &str) -> crate::Result<MediaPlaylist> {
-        Self::new()
+        parse_media_playlist(input, self)
     }
 }
 
-/// Media playlist.
-#[derive(Debug, Clone)]
-pub struct MediaPlaylist {
-    version_tag: ExtXVersion,
-    target_duration_tag: ExtXTargetDuration,
-    media_sequence_tag: Option<ExtXMediaSequence>,
-    discontinuity_sequence_tag: Option<ExtXDiscontinuitySequence>,
-    playlist_type_tag: Option<ExtXPlaylistType>,
-    i_frames_only_tag: Option<ExtXIFramesOnly>,
-    independent_segments_tag: Option<ExtXIndependentSegments>,
-    start_tag: Option<ExtXStart>,
-    end_list_tag: Option<ExtXEndList>,
-    segments: Vec<MediaSegment>,
-}
-
 impl MediaPlaylist {
+    /// Creates a [MediaPlaylistBuilder].
+    pub fn builder() -> MediaPlaylistBuilder {
+        MediaPlaylistBuilder::default()
+    }
     /// Returns the `EXT-X-VERSION` tag contained in the playlist.
     pub const fn version_tag(&self) -> ExtXVersion {
         self.version_tag
@@ -292,66 +310,28 @@ impl fmt::Display for MediaPlaylist {
     }
 }
 
-impl FromStr for MediaPlaylist {
+fn parse_media_playlist(
-    type Err = Error;
+    input: &str,
-
+    builder: &mut MediaPlaylistBuilder,
-    fn from_str(input: &str) -> Result<Self, Self::Err> {
+) -> crate::Result<MediaPlaylist> {
-        MediaPlaylistOptions::new().parse(input)
-    }
-}
-
-/// Media playlist options.
-#[derive(Debug, Clone)]
-pub struct MediaPlaylistOptions {
-    allowable_excess_duration: Duration,
-}
-
-impl MediaPlaylistOptions {
-    /// Makes a new `MediaPlaylistOptions` with the default settings.
-    pub const fn new() -> Self {
-        MediaPlaylistOptions {
-            allowable_excess_duration: Duration::from_secs(0),
-        }
-    }
-
-    /// Sets the allowable excess duration of each media segment in the associated playlist.
-    ///
-    /// If there is a media segment of which duration exceeds
-    /// `#EXT-X-TARGETDURATION + allowable_excess_duration`,
-    /// the invocation of `MediaPlaylistBuilder::finish()` method will fail.
-    ///
-    /// The default value is `Duration::from_secs(0)`.
-    pub fn allowable_excess_segment_duration(
-        &mut self,
-        allowable_excess_duration: Duration,
-    ) -> &mut Self {
-        self.allowable_excess_duration = allowable_excess_duration;
-        self
-    }
-
-    /// Parses the given M3U8 text with the specified settings.
-    pub fn parse(&self, m3u8: &str) -> crate::Result<MediaPlaylist> {
-        let mut builder = MediaPlaylistBuilder::new();
-        builder.options(self.clone());
-
     let mut segment = MediaSegmentBuilder::new();
+    let mut segments = vec![];
+
     let mut has_partial_segment = false;
     let mut has_discontinuity_tag = false;
-        for (i, line) in m3u8.parse::<Lines>()?.into_iter().enumerate() {
+
+    for (i, line) in input.parse::<Lines>()?.into_iter().enumerate() {
         match line {
             Line::Tag(tag) => {
                 if i == 0 {
                     if tag != Tag::ExtM3u(ExtM3u) {
-                            return Err(Error::invalid_input());
+                        return Err(Error::custom("m3u8 doesn't start with #EXTM3U"));
                     }
                     continue;
                 }
                 match tag {
                     Tag::ExtM3u(_) => return Err(Error::invalid_input()),
                     Tag::ExtXVersion(t) => {
-                            if builder.version.is_some() {
-                                return Err(Error::invalid_input());
-                            }
                         builder.version(t.version());
                     }
                     Tag::ExtInf(t) => {
@@ -384,31 +364,28 @@ impl MediaPlaylistOptions {
                         segment.tag(t);
                     }
                     Tag::ExtXTargetDuration(t) => {
-                            builder.tag(t);
+                        builder.target_duration_tag(t);
                     }
                     Tag::ExtXMediaSequence(t) => {
-                            if builder.segments.is_empty() {
+                        builder.media_sequence_tag(t);
-                                return Err(Error::invalid_input());
-                            }
-                            builder.tag(t);
                     }
                     Tag::ExtXDiscontinuitySequence(t) => {
-                            if builder.segments.is_empty() {
+                        if segments.is_empty() {
                             return Err(Error::invalid_input());
                         }
                         if has_discontinuity_tag {
                             return Err(Error::invalid_input());
                         }
-                            builder.tag(t);
+                        builder.discontinuity_sequence_tag(t);
                     }
                     Tag::ExtXEndList(t) => {
-                            builder.tag(t);
+                        builder.end_list_tag(t);
                     }
                     Tag::ExtXPlaylistType(t) => {
-                            builder.tag(t);
+                        builder.playlist_type_tag(t);
                     }
                     Tag::ExtXIFramesOnly(t) => {
-                            builder.tag(t);
+                        builder.i_frames_only_tag(t);
                     }
                     Tag::ExtXMedia(_)
                     | Tag::ExtXStreamInf(_)
@@ -418,10 +395,10 @@ impl MediaPlaylistOptions {
                         return Err(Error::custom(tag));
                     }
                     Tag::ExtXIndependentSegments(t) => {
-                            builder.tag(t);
+                        builder.independent_segments_tag(t);
                     }
                     Tag::ExtXStart(t) => {
-                            builder.tag(t);
+                        builder.start_tag(t);
                     }
                     Tag::Unknown(_) => {
                         // [6.3.1. General Client Responsibilities]
@@ -431,7 +408,7 @@ impl MediaPlaylistOptions {
             }
             Line::Uri(uri) => {
                 segment.uri(uri);
-                    builder.segment((segment.finish())?);
+                segments.push(segment.finish()?);
                 segment = MediaSegmentBuilder::new();
                 has_partial_segment = false;
             }
@@ -440,13 +417,16 @@ impl MediaPlaylistOptions {
     if has_partial_segment {
         return Err(Error::invalid_input());
     }
-        builder.finish()
+
-    }
+    builder.segments(segments);
+    builder.build().map_err(Error::builder_error)
 }
 
-impl Default for MediaPlaylistOptions {
+impl FromStr for MediaPlaylist {
-    fn default() -> Self {
+    type Err = Error;
-        Self::new()
+
+    fn from_str(input: &str) -> Result<Self, Self::Err> {
+        parse_media_playlist(input, &mut Self::builder())
     }
 }
 
@@ -471,20 +451,20 @@ mod tests {
         assert!(m3u8.parse::<MediaPlaylist>().is_err());
 
         // Error (allowable segment duration = 9)
-        assert!(MediaPlaylistOptions::new()
+        assert!(MediaPlaylist::builder()
-            .allowable_excess_segment_duration(Duration::from_secs(1))
+            .allowable_excess_duration(Duration::from_secs(1))
             .parse(m3u8)
             .is_err());
 
         // Ok (allowable segment duration = 10)
-        assert!(MediaPlaylistOptions::new()
+        MediaPlaylist::builder()
-            .allowable_excess_segment_duration(Duration::from_secs(2))
+            .allowable_excess_duration(Duration::from_secs(2))
             .parse(m3u8)
-            .is_ok());
+            .unwrap();
     }
 
     #[test]
-    fn empty_m3u8_parse_test() {
+    fn test_parser() {
         let m3u8 = "";
         assert!(m3u8.parse::<MediaPlaylist>().is_err());
     }

src/tags/master_playlist/stream_inf.rs

@@ -31,9 +31,9 @@ impl ExtXStreamInf {
     pub(crate) const PREFIX: &'static str = "#EXT-X-STREAM-INF:";
 
     /// Makes a new `ExtXStreamInf` tag.
-    pub const fn new(uri: SingleLineString, bandwidth: u64) -> Self {
+    pub fn new<T: ToString>(uri: T, bandwidth: u64) -> Self {
         ExtXStreamInf {
-            uri,
+            uri: SingleLineString::new(uri.to_string()).unwrap(),
             bandwidth,
             average_bandwidth: None,
             codecs: None,
@@ -209,11 +209,27 @@ mod test {
     use super::*;
 
     #[test]
-    fn ext_x_stream_inf() {
+    fn test_parser() {
-        let tag = ExtXStreamInf::new(SingleLineString::new("foo").unwrap(), 1000);
+        let stream_inf = "#EXT-X-STREAM-INF:BANDWIDTH=1000\nfoo"
-        let text = "#EXT-X-STREAM-INF:BANDWIDTH=1000\nfoo";
+            .parse::<ExtXStreamInf>()
-        assert_eq!(text.parse().ok(), Some(tag.clone()));
+            .unwrap();
-        assert_eq!(tag.to_string(), text);
+
-        assert_eq!(tag.requires_version(), ProtocolVersion::V1);
+        assert_eq!(stream_inf, ExtXStreamInf::new("foo", 1000));
+    }
+
+    #[test]
+    fn test_requires_version() {
+        assert_eq!(
+            ProtocolVersion::V1,
+            ExtXStreamInf::new("foo", 1000).requires_version()
+        );
+    }
+
+    #[test]
+    fn test_display() {
+        assert_eq!(
+            ExtXStreamInf::new("foo", 1000).to_string(),
+            "#EXT-X-STREAM-INF:BANDWIDTH=1000\nfoo".to_string()
+        );
     }
 }

src/tags/media_playlist/target_duration.rs

@@ -9,7 +9,7 @@ use crate::Error;
 /// [4.3.3.1. EXT-X-TARGETDURATION]
 ///
 /// [4.3.3.1. EXT-X-TARGETDURATION]: https://tools.ietf.org/html/rfc8216#section-4.3.3.1
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
 pub struct ExtXTargetDuration {
     duration: Duration,
 }