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improve ExtXMap

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Luro02 2020-03-17 16:13:38 +01:00
parent ff807940b2
commit 1b01675250
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1 changed files with 27 additions and 5 deletions
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32
src/tags/media_segment/map.rs
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@ -9,13 +9,28 @@ use crate::types::{ByteRange, ProtocolVersion};
use crate::utils::{quote, tag, unquote};
use crate::{Encrypted, Error, RequiredVersion};
/// # [4.3.2.5. EXT-X-MAP]
/// The [`ExtXMap`] tag specifies how to obtain the [Media Initialization
/// Section], required to parse the applicable [`MediaSegment`]s.
///
/// The [`ExtXMap`] tag specifies how to obtain the Media Initialization
/// Section, required to parse the applicable [`MediaSegment`]s.
/// It applies to every [`MediaSegment`] that appears after it in the playlist
/// until the next [`ExtXMap`] tag or until the end of the playlist.
///
/// An [`ExtXMap`] tag should be supplied for [`MediaSegment`]s in playlists
/// with the [`ExtXIFramesOnly`] tag when the first [`MediaSegment`] (i.e.,
/// I-frame) in the playlist (or the first segment following an
/// [`ExtXDiscontinuity`] tag) does not immediately follow the Media
/// Initialization Section at the beginning of its resource.
///
/// If the Media Initialization Section declared by an [`ExtXMap`] tag is
/// encrypted with [`EncryptionMethod::Aes128`], the IV attribute of
/// the [`ExtXKey`] tag that applies to the [`ExtXMap`] is required.
///
/// [Media Initialization Section]: https://tools.ietf.org/html/rfc8216#section-3
/// [`MediaSegment`]: crate::MediaSegment
/// [4.3.2.5. EXT-X-MAP]: https://tools.ietf.org/html/rfc8216#section-4.3.2.5
/// [`ExtXIFramesOnly`]: crate::tags::ExtXIFramesOnly
/// [`ExtXDiscontinuity`]: crate::tags::ExtXDiscontinuity
/// [`EncryptionMethod::Aes128`]: crate::types::EncryptionMethod::Aes128
/// [`MediaPlaylist`]: crate::MediaPlaylist
#[derive(ShortHand, Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
#[shorthand(enable(must_use, into))]
pub struct ExtXMap {
@ -99,7 +114,14 @@ impl Encrypted for ExtXMap {
fn keys_mut(&mut self) -> &mut Vec<ExtXKey> { &mut self.keys }
}
/// This tag requires [`ProtocolVersion::V6`].
/// Use of the [`ExtXMap`] tag in a [`MediaPlaylist`] that contains the
/// [`ExtXIFramesOnly`] tag requires [`ProtocolVersion::V5`] or
/// greater. Use of the [`ExtXMap`] tag in a [`MediaPlaylist`] that does not
/// contain the [`ExtXIFramesOnly`] tag requires [`ProtocolVersion::V6`] or
/// greater.
///
/// [`ExtXIFramesOnly`]: crate::tags::ExtXIFramesOnly
/// [`MediaPlaylist`]: crate::MediaPlaylist
impl RequiredVersion for ExtXMap {
// this should return ProtocolVersion::V5, if it does not contain an
// EXT-X-I-FRAMES-ONLY!