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improve documentation of EncryptionMethod

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Luro02 2020-02-24 14:28:14 +01:00
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1 changed files with 27 additions and 23 deletions
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src/types/encryption_method.rs
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@ -1,43 +1,46 @@
use strum::{Display, EnumString};
/// Encryption method.
///
/// See: [4.3.2.4. EXT-X-KEY]
///
/// [4.3.2.4. EXT-X-KEY]: https://tools.ietf.org/html/rfc8216#section-4.3.2.4
/// The encryption method.
#[non_exhaustive]
#[allow(missing_docs)]
#[derive(Ord, PartialOrd, Debug, Clone, Copy, PartialEq, Eq, Hash, Display, EnumString)]
#[strum(serialize_all = "SCREAMING-KEBAB-CASE")]
pub enum EncryptionMethod {
/// `None` means that the [`MediaSegment`]s are not encrypted.
/// The [`MediaSegment`]s are not encrypted.
///
/// [`MediaSegment`]: crate::MediaSegment
None,
/// `Aes128` signals that the [`MediaSegment`]s are completely encrypted
/// using the Advanced Encryption Standard ([AES-128]) with a 128-bit
/// key, Cipher Block Chaining (CBC), and
/// [Public-Key Cryptography Standards #7 (PKCS7)] padding.
/// The [`MediaSegment`]s are completely encrypted using the Advanced
/// Encryption Standard ([AES-128]) with a 128-bit key, Cipher Block
/// Chaining (CBC), and [Public-Key Cryptography Standards #7 (PKCS7)]
/// padding.
///
/// CBC is restarted on each segment boundary, using either the
/// Initialization Vector (IV) attribute value or the Media Sequence
/// Number as the IV.
/// Initialization Vector (IV) or the Media Sequence Number as the IV
///
/// ```
/// # let media_sequence_number = 5;
/// # assert_eq!(
/// format!("0x{:032x}", media_sequence_number)
/// # , "00000000000000000000000000000005".to_string());
/// ```
///
/// [`MediaSegment`]: crate::MediaSegment
/// [AES-128]: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.197.pdf
/// [Public-Key Cryptography Standards #7 (PKCS7)]: https://tools.ietf.org/html/rfc5652
#[strum(serialize = "AES-128")]
Aes128,
/// `SampleAes` means that the [`MediaSegment`]s
/// contain media samples, such as audio or video, that are encrypted
/// using the Advanced Encryption Standard ([`AES-128`]). How these media
/// streams are encrypted and encapsulated in a segment depends on the
/// media encoding and the media format of the segment. fMP4 Media
/// Segments are encrypted using the 'cbcs' scheme of
/// [Common Encryption]. Encryption of other Media Segment
/// formats containing [H.264], [AAC], [AC-3],
/// and Enhanced [AC-3] media streams is described in the HTTP
/// Live Streaming (HLS) [SampleEncryption specification].
/// The [`MediaSegment`]s contain media samples, such as audio or video,
/// that are encrypted using the Advanced Encryption Standard ([`AES-128`]).
///
/// How these media streams are encrypted and encapsulated in a segment
/// depends on the media encoding and the media format of the segment.
///
/// `fMP4` [`MediaSegment`]s are encrypted using the `cbcs` scheme of
/// [Common Encryption].
/// Encryption of other [`MediaSegment`] formats containing [H.264], [AAC],
/// [AC-3], and Enhanced [AC-3] media streams is described in the
/// [HTTP Live Streaming (HLS) SampleEncryption specification].
///
/// [`MediaSegment`]: crate::MediaSegment
/// [`AES-128`]: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.197.pdf
@ -45,7 +48,8 @@ pub enum EncryptionMethod {
/// [H.264]: https://tools.ietf.org/html/rfc8216#ref-H_264
/// [AAC]: https://tools.ietf.org/html/rfc8216#ref-ISO_14496
/// [AC-3]: https://tools.ietf.org/html/rfc8216#ref-AC_3
/// [SampleEncryption specification]: https://tools.ietf.org/html/rfc8216#ref-SampleEnc
/// [HTTP Live Streaming (HLS) SampleEncryption specification]:
/// https://tools.ietf.org/html/rfc8216#ref-SampleEnc
SampleAes,
}