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August 18, 2023 13:00
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ffmpeg_swift_wrapper_transcode_hls_example
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| // | |
| // Transcoder.swift | |
| // | |
| // Copyright (c) 2020 Changbeom Ahn, 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 | |
| import FFmpegSupport | |
| public typealias TimeRange = Range<TimeInterval> | |
| public enum FFmpegError: Error { | |
| case exit(code: Int) | |
| case fileNotFound | |
| } | |
| open class Transcoder: ObservableObject { | |
| open var progressBlock: ((Double) -> Void)? | |
| public init(progressBlock: ((Double) -> Void)? = nil) { | |
| self.progressBlock = progressBlock | |
| } | |
| open func convertToHLS(fileName: String, segmentTime: Int = 10) throws { | |
| guard let from = Bundle.main.url(forResource: fileName, withExtension: "MP4") else { | |
| throw FFmpegError.fileNotFound | |
| } | |
| let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] | |
| let outputPath = documentsDirectory.appendingPathComponent(fileName) | |
| // Create output directory if it doesn't exist | |
| do { | |
| try FileManager.default.createDirectory(at: outputPath, withIntermediateDirectories: true, attributes: nil) | |
| } catch { | |
| print("Couldn't create directory \(outputPath)") | |
| throw error | |
| } | |
| let args = [ | |
| "FFmpeg-iOS", | |
| "-i", from.path, | |
| "-f", "segment", | |
| "-segment_time", "\(segmentTime)", | |
| "-segment_format", "mpegts", | |
| "-segment_list", outputPath.appendingPathComponent("playlist.m3u8").path, | |
| "\(outputPath.path)/segment%03d.ts" | |
| ] | |
| let code = ffmpeg(args) | |
| print(#function, code) | |
| guard code == 0 else { | |
| throw FFmpegError.exit(code: code) | |
| } | |
| print("success") | |
| } | |
| @available(iOS 13.0, *) | |
| open func transcode(from: URL, to url: URL, timeRange: TimeRange?, bitRate: Double?) throws { | |
| let pipe = Pipe() | |
| Task { | |
| if #available(iOS 15.0, *) { | |
| var info = [String: String]() | |
| let maxTime: Double | |
| if let timeRange = timeRange { | |
| maxTime = (timeRange.upperBound - timeRange.lowerBound) * 1_000_000 | |
| } else { | |
| maxTime = 1_000_000 // FIXME: probe? | |
| } | |
| print(#function, "await lines", pipe.fileHandleForReading) | |
| for try await line in pipe.fileHandleForReading.bytes.lines { | |
| // print(#function, line) | |
| let components = line.split(separator: "=") | |
| assert(components.count == 2) | |
| let key = String(components[0]) | |
| info[key] = String(components[1]) | |
| if key == "progress" { | |
| // print(#function, info) | |
| if let time = Int(info["out_time_us"] ?? ""), | |
| time >= 0 { // FIXME: reset global variable(s) causing it | |
| let progress = Double(time) / maxTime | |
| print(#function, "progress:", progress | |
| // , info["out_time_us"] ?? "nil", time | |
| ) | |
| progressBlock?(progress) | |
| } | |
| guard info["progress"] != "end" else { break } | |
| info.removeAll() | |
| } | |
| } | |
| print(#function, "no more lines?", pipe.fileHandleForReading) | |
| } else { | |
| // Fallback on earlier versions | |
| } | |
| } | |
| var args = [ | |
| "FFmpeg-iOS", | |
| "-progress", "pipe:\(pipe.fileHandleForWriting.fileDescriptor)", | |
| "-nostats", | |
| ] | |
| if let timeRange = timeRange { | |
| args += [ | |
| "-ss", "\(timeRange.lowerBound)", | |
| "-t", "\(timeRange.upperBound - timeRange.lowerBound)", | |
| ] | |
| } | |
| args += [ | |
| "-i", from.path, | |
| ] | |
| if let bitRate = bitRate { | |
| args += [ | |
| "-b:v", "\(Int(bitRate))k", | |
| ] | |
| } | |
| args += [ | |
| "-c:v", "h264_videotoolbox", | |
| url.path, | |
| ] | |
| let code = ffmpeg(args) | |
| print(#function, code) | |
| try pipe.fileHandleForWriting.close() | |
| guard code == 0 else { | |
| throw FFmpegError.exit(code: code) | |
| } | |
| } | |
| } | |
| public func format(_ seconds: Int) -> String? { | |
| guard seconds >= 0 else { | |
| print(#function, "invalid seconds:", seconds) | |
| return nil | |
| } | |
| let (minutes, sec) = seconds.quotientAndRemainder(dividingBy: 60) | |
| var string = "\(sec)" | |
| guard minutes > 0 else { | |
| return string | |
| } | |
| let (hours, min) = minutes.quotientAndRemainder(dividingBy: 60) | |
| string = "\(min):" + (sec < 10 ? "0" : "") + string | |
| guard hours > 0 else { | |
| return string | |
| } | |
| return "\(hours):" + (min < 10 ? "0" : "") + string | |
| } |
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