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feat: segment playback slider with resolved YouTube chapters

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This commit is contained in:
Valdemar Høgsvig Lorenzen
2026-10-25 02:22:37 +01:00
parent 2391dadc75
commit 119fe2e737
5 changed files with 272 additions and 20 deletions
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Checks/youtube-resolver.swift
+65
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@@ -167,6 +167,70 @@ struct YouTubeResolverChecks {
try require(try decode(emptyHeaders).video.headers.isEmpty, "absent headers serialize to an empty block")
}
static func chapters() throws {
var object = try fixture(combinedJSON)
try require(try decode(object).chapters.isEmpty, "absent chapters remain playable")
for payload in [NSNull(), [], true, 17, "chapters", [:],
[NSNull(), 17, "row", [:], ["start_time": 0],
["start_time": "0", "end_time": 2], ["start_time": 0, "end_time": false]]] as [Any] {
object["chapters"] = payload
let video = try decode(object)
try require(video.chapters.isEmpty && video.video.url == "https://media.example/combined",
"null, empty and malformed optional chapters never prevent playback")
}
object["chapters"] = [
NSNull(),
["start_time": 0, "end_time": 2.25, "title": "Opening"],
["start_time": 2.25, "end_time": 8.75],
["start_time": 8.75, "end_time": 12, "title": ["malformed"]],
["start_time": 2.25, "end_time": 8.75, "title": NSNull()]
] as [Any]
let decoded = try decode(object)
try require(decoded.chapters.count == 4 && decoded.chapters[0].title == "Opening"
&& decoded.chapters[0].end == 2.25 && decoded.chapters[1].start == 2.25,
"fractional chapters and titles survive malformed sibling rows")
try require(decoded.chapters.dropFirst().allSatisfy { $0.title == nil },
"missing, null and malformed optional titles do not discard chapters")
try require(decoded.chapterBoundaries(duration: 12) == [2.25, 8.75],
"chapter edges are sorted, deduplicated and strictly interior")
object["duration"] = 0
object["chapters"] = [["start_time": 0, "end_time": 2.25],
["start_time": 2.25, "end_time": 20.5]]
let unknownDuration = try decode(object)
try require(unknownDuration.chapterBoundaries(duration: 20.5) == [2.25],
"actual playback duration, not extractor duration, validates chapters")
for duration in [0, -1, Double.nan, .infinity, -.infinity] {
try require(unknownDuration.chapterBoundaries(duration: duration).isEmpty,
"unknown and invalid playback durations never produce boundaries")
}
let video = YouTubeVideo(title: "Chapters",
video: .init(url: "https://media.example/combined", headers: ""), audio: nil,
duration: 0, isLive: false, webpageURL: page, height: nil, availableHeights: [],
chapters: [
.init(start: 8.75, end: 12, title: nil),
.init(start: 0, end: 2.25, title: nil),
.init(start: 2.25, end: 8.75, title: nil),
.init(start: 2.25, end: 8.75, title: nil),
.init(start: -1, end: 4, title: nil),
.init(start: 3, end: 13, title: nil),
.init(start: 6, end: 6, title: nil),
.init(start: 7, end: 5, title: nil),
.init(start: .nan, end: 4, title: nil),
.init(start: .infinity, end: 4, title: nil),
.init(start: -.infinity, end: 4, title: nil),
.init(start: 3, end: .nan, title: nil),
.init(start: 3, end: .infinity, title: nil),
.init(start: 3, end: -.infinity, title: nil)
])
try require(video.chapterBoundaries(duration: 12) == [2.25, 8.75],
"invalid, zero-length, reversed and over-range rows contribute neither edge")
object["chapters"] = "malformed optional data"
object["url"] = 17
try reject("chapter tolerance must not weaken required stream validation") { _ = try decode(object) }
}
static func qualities() throws {
func video(_ height: Int, audio: Bool = false, range: String = "SDR", transport: String = "https") -> [String: Any] {
["height": height, "vcodec": "h264", "acodec": audio ? "aac" : "none",
@@ -609,6 +673,7 @@ struct YouTubeResolverChecks {
try FileManager.default.createSymbolicLink(at: runtime, withDestinationURL: URL(fileURLWithPath: "/usr/bin/true"))
try videoURLs()
try metadata()
try chapters()
try malformedMetadata()
try qualities()
try bundledHelpers(root: root)