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insert iv based on segmentnumber

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Luro02 2020-03-28 10:47:52 +01:00
parent e187c9dc7c
commit 8eb45dceb7
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GPG key ID: B66FD4F74501A9CF
1 changed files with 35 additions and 10 deletions
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45
src/media_playlist.rs
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@ -301,6 +301,22 @@ impl MediaPlaylistBuilder {
let mut segment = segment.clone();
segment.number = position;
// add the segment number as iv, if the iv is missing:
for key in &mut segment.keys {
if let ExtXKey(Some(DecryptionKey {
method, iv, format, ..
})) = key
{
if *method == EncryptionMethod::Aes128 && *iv == InitializationVector::Missing {
if format.is_none() {
*iv = InitializationVector::Number(segment.number as u128);
} else if let Some(KeyFormat::Identity) = format {
*iv = InitializationVector::Number(segment.number as u128);
}
}
}
}
result_segments.insert(segment.number, segment);
position += 1;
}
@ -428,26 +444,35 @@ impl fmt::Display for MediaPlaylist {
writeln!(f, "{}", value)?;
}
let mut available_keys = HashSet::new();
let mut available_keys = HashSet::<ExtXKey>::new();
for segment in self.segments.values() {
for key in &segment.keys {
// the key is new:
if let ExtXKey(Some(decryption_key)) = key {
// TODO: this piece should be linted by clippy?
// next segment will be encrypted, so the segment can not have an empty key
available_keys.remove(&ExtXKey::empty());
let mut decryption_key = decryption_key.clone();
let key = {
if let InitializationVector::Number(_) = decryption_key.iv {
// set the iv from a segment number to missing
// this does reduce the output size and the correct iv
// is automatically set, when parsing.
decryption_key.iv = InitializationVector::Missing;
}
ExtXKey(Some(decryption_key.clone()))
};
// only do something if a key has been overwritten
if available_keys.insert(key) {
if available_keys.insert(key.clone()) {
let mut remove_key = None;
// an old key might be removed:
for k in &available_keys {
if let ExtXKey(Some(dk)) = k {
if dk.format == decryption_key.format && &key != k {
remove_key = Some(*k);
if dk.format == decryption_key.format && key != *k {
remove_key = Some(k.clone());
break;
}
} else {
@ -457,7 +482,7 @@ impl fmt::Display for MediaPlaylist {
if let Some(k) = remove_key {
// this should always be true:
let res = available_keys.remove(k);
let res = available_keys.remove(&k);
debug_assert!(res);
}
@ -466,7 +491,7 @@ impl fmt::Display for MediaPlaylist {
} else {
// the next segment is not encrypted, so remove all available keys
available_keys.clear();
available_keys.insert(key);
available_keys.insert(ExtXKey::empty());
writeln!(f, "{}", key)?;
}
}
@ -632,7 +657,7 @@ fn parse_media_playlist(
}
if has_partial_segment {
return Err(Error::invalid_input());
return Err(Error::custom("Missing URI for the last `MediaSegment`"));
}
builder.unknown(unknown);