feat: HLS 세그먼트를 앞부분부터 잘라서 로드시킬 수 있는 커스텀 리소스 로더 구현 #330
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| // | ||
| // URL+.swift | ||
| // Layover | ||
| // | ||
| // Created by 김인환 on 12/14/23. | ||
| // Copyright © 2023 CodeBomber. All rights reserved. | ||
| // | ||
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| import Foundation | ||
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| extension URL { | ||
| func changeScheme(to: String) -> URL { | ||
| var components = URLComponents(url: self, resolvingAgainstBaseURL: false) | ||
| components?.scheme = to | ||
| return components?.url ?? self | ||
| } | ||
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| var customHLS_URL: URL { | ||
| changeScheme(to: "lhls") | ||
| } | ||
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| var originHLS_URL: URL { | ||
| changeScheme(to: "https") | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| // | ||
| // HLSAssetResourceLoaderDelegate.swift | ||
| // Layover | ||
| // | ||
| // Created by 김인환 on 12/14/23. | ||
| // Copyright © 2023 CodeBomber. All rights reserved. | ||
| // | ||
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| import Foundation | ||
| import AVFoundation | ||
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| class HLSAssetResourceLoaderDelegate: NSObject, AVAssetResourceLoaderDelegate { | ||
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| // MARK: - Properties | ||
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| let resourceLoader: ResourceLoader | ||
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| // MARK: - Initializer | ||
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| init(resourceLoader: ResourceLoader) { | ||
| self.resourceLoader = resourceLoader | ||
| } | ||
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| // MARK: - Delegate Methods | ||
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| func resourceLoader(_ resourceLoader: AVAssetResourceLoader, | ||
| shouldWaitForLoadingOfRequestedResource loadingRequest: AVAssetResourceLoadingRequest) -> Bool { | ||
| loadRequestedResource(loadingRequest) | ||
| } | ||
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| func resourceLoader(_ resourceLoader: AVAssetResourceLoader, | ||
| shouldWaitForRenewalOfRequestedResource renewalRequest: AVAssetResourceRenewalRequest) -> Bool { | ||
| loadRequestedResource(renewalRequest) | ||
| } | ||
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| // MARK: - Methods | ||
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| // 공통으로 처리 | ||
| func loadRequestedResource(_ loadingRequest: AVAssetResourceLoadingRequest) -> Bool { | ||
| guard let url = loadingRequest.request.url?.originHLS_URL else { return false } | ||
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| if url.pathExtension.contains("ts") { // ts 파일은 리디렉션 시킨다. | ||
| loadingRequest.redirect = URLRequest(url: url) | ||
| loadingRequest.response = HTTPURLResponse(url: url, | ||
| statusCode: 302, | ||
| httpVersion: nil, | ||
| headerFields: nil) | ||
| loadingRequest.finishLoading() | ||
| } else { | ||
| Task { | ||
| guard let data = await resourceLoader.loadResource(from: url) else { | ||
| loadingRequest.finishLoading(with: NSError(domain: "Failed to load resource from \(url.absoluteString)", | ||
| code: 0, | ||
| userInfo: nil)) | ||
| return | ||
| } | ||
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| loadingRequest.dataRequest?.respond(with: data) | ||
| loadingRequest.finishLoading() | ||
| } | ||
| } | ||
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| return true | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| // | ||
| // HLSResourceLoader.swift | ||
| // Layover | ||
| // | ||
| // Created by 김인환 on 12/14/23. | ||
| // Copyright © 2023 CodeBomber. All rights reserved. | ||
| // | ||
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| import Foundation | ||
| import OSLog | ||
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| protocol ResourceLoader { | ||
| func loadResource(from url: URL) async -> Data? | ||
| } | ||
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| // 앞부분부터 원하는 duration만큼 잘라서 load시켜주는 Resource Loader | ||
| final class HLSSliceResourceLoader: ResourceLoader { | ||
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| enum M3U8Tag: String { | ||
| case extm3u = "#EXTM3U" // m3u8 파일의 시작 | ||
| case extend = "#EXT-X-ENDLIST" // 마지막 태그 | ||
| case extinf = "#EXTINF:" // 재생시간 -> 미디어 m3u8 파일에 포함 | ||
| case extxstreaminf = "#EXT-X-STREAM-INF" // 마스터 m3u8 파일 | ||
| } | ||
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| // MARK: - Properties | ||
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| private let session: URLSession | ||
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| // MARK: - Initializer | ||
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| init(session: URLSession = URLSession(configuration: .default)) { | ||
| self.session = session | ||
| } | ||
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| // MARK: - ResourceLoader | ||
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| func loadResource(from url: URL) async -> Data? { | ||
| let urlRequest = URLRequest(url: url.originHLS_URL) // 원래 url scheme 으로 변경 | ||
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| guard let (data, response) = try? await session.data(for: urlRequest), | ||
| let httpResponse = response as? HTTPURLResponse, | ||
| (200...399) ~= httpResponse.statusCode else { | ||
| os_log(.error, log: .data, "Failed to load resource from %{public}@", url.absoluteString) | ||
| return nil | ||
| } | ||
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| guard let m3u8Playlist = String(data: data, encoding: .utf8) else { | ||
| os_log(.error, log: .data, "Failed to decode data to String") | ||
| return nil | ||
| } | ||
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| guard isMediaM3U8(m3u8Playlist) else { return data } | ||
| return sliceM3U8Playlist(m3u8Playlist, duration: 4).data(using: .utf8) ?? data // 3초보다는 약간 여유있게 잡는다. | ||
| } | ||
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| // MARK: - Methods | ||
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| private func isMediaM3U8(_ m3u8Playlist: String) -> Bool { | ||
| m3u8Playlist.contains(M3U8Tag.extinf.rawValue) | ||
| } | ||
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| // m3u8 미디어 플레이리스트를 받아서 duration만큼 잘라서 반환 | ||
| private func sliceM3U8Playlist(_ m3u8Playlist: String, duration: TimeInterval) -> String { | ||
| var duration = duration | ||
| var playlist = m3u8Playlist.components(separatedBy: M3U8Tag.extinf.rawValue) | ||
| .compactMap { | ||
| if $0.contains(M3U8Tag.extm3u.rawValue) { return $0 } // 시작부분 | ||
| else if let tsDuration = $0.components(separatedBy: ",").compactMap({ Double($0) }).first, | ||
| duration > .zero { | ||
| duration -= tsDuration | ||
| return $0 | ||
| } else { | ||
| return nil | ||
| } | ||
| }.joined(separator: M3U8Tag.extinf.rawValue) | ||
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| if !playlist.contains(M3U8Tag.extend.rawValue) { | ||
| playlist.append("\n\(M3U8Tag.extend.rawValue)") | ||
| } | ||
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| return playlist | ||
| } | ||
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| } | ||
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pdf로만 봤었는데 m3u8파일 내부를 까서 시작 부분부터 재생할 duration까지만 ts 세그먼트를 합치는 고런 로직이군요.. 좋습니당
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맞아요 간단한...3초 3겹살...