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August 18, 2023 15:55
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primitive m3u8 encoder-decoder
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| // License: MIT | |
| // 2023 Ivan Oparin | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a copy | |
| // of this software and associated documentation files (the "Software"), to deal | |
| // in the Software without restriction, including without limitation the rights | |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| // copies of the Software, and to permit persons to whom the Software is | |
| // furnished to do so, subject to the following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included in | |
| // all copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| // THE SOFTWARE. | |
| // | |
| import Foundation | |
| enum m3u8 { | |
| static func encode(_ playlist: HLSPlaylist, to url: URL) throws { | |
| let lines = playlist.entries.map { entry -> String in | |
| switch entry { | |
| case .directive(let directive): | |
| return directive | |
| case .segment(let segment): | |
| return segment | |
| } | |
| } | |
| let text = lines.joined(separator: "\n") | |
| try text.write(to: url, atomically: true, encoding: .utf8) | |
| } | |
| static func decode(_ playlist: URL) throws -> HLSPlaylist { | |
| let text = try String(contentsOf: playlist, encoding: .utf8) | |
| let lines = text.split(separator: "\n") | |
| var playlist = HLSPlaylist() | |
| for line in lines { | |
| if line.hasPrefix("#") { | |
| // This is a directive | |
| playlist.entries.append(.directive(String(line))) | |
| } else { | |
| // This is a URI for a media segment or sub-playlist | |
| playlist.entries.append(.segment(String(line))) | |
| } | |
| } | |
| return playlist | |
| } | |
| static func decode(_ playlist: URL, prependingUrl components: URL) throws -> HLSPlaylist { | |
| let text = try String(contentsOf: playlist, encoding: .utf8) | |
| let lines = text.split(separator: "\n") | |
| var playlist = HLSPlaylist() | |
| for line in lines { | |
| if line.hasPrefix("#") { | |
| // This is a directive | |
| playlist.entries.append(.directive(String(line))) | |
| } else { | |
| // This is a URI for a media segment or sub-playlist | |
| playlist.entries.append(.segment("\(components.path)\(String(line))")) | |
| } | |
| } | |
| return playlist | |
| } | |
| enum PlaylistEntry: Equatable { | |
| case directive(String) | |
| case segment(String) | |
| var isSegment: Bool { | |
| switch self { | |
| case .directive: | |
| return false | |
| case .segment: | |
| return true | |
| } | |
| } | |
| var value: String { | |
| switch self { | |
| case let .directive(value): | |
| return value | |
| case let .segment(value): | |
| return value | |
| } | |
| } | |
| } | |
| struct HLSPlaylist { | |
| var entries: [PlaylistEntry] = [] | |
| } | |
| } | |
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