95 lines
3.8 KiB
Swift
95 lines
3.8 KiB
Swift
//
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// AttachmentViewModel+Compress.swift
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//
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//
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// Created by MainasuK on 2022/11/11.
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//
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import os.log
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import UIKit
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import AVKit
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import SessionExporter
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import MastodonCore
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extension AttachmentViewModel {
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func comporessVideo(url: URL) async throws -> URL {
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let urlAsset = AVURLAsset(url: url)
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let exporter = NextLevelSessionExporter(withAsset: urlAsset)
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exporter.outputFileType = .mp4
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var isLandscape: Bool = {
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guard let track = urlAsset.tracks(withMediaType: .video).first else {
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return true
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}
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let size = track.naturalSize.applying(track.preferredTransform)
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return abs(size.width) >= abs(size.height)
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}()
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let outputURL = try FileManager.default.createTemporaryFileURL(
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filename: UUID().uuidString,
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pathExtension: url.pathExtension
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)
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exporter.outputURL = outputURL
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let compressionDict: [String: Any] = [
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AVVideoAverageBitRateKey: NSNumber(integerLiteral: 3000000), // 3000k
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AVVideoProfileLevelKey: AVVideoProfileLevelH264HighAutoLevel as String,
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AVVideoAverageNonDroppableFrameRateKey: NSNumber(floatLiteral: 30), // 30 FPS
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]
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exporter.videoOutputConfiguration = [
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AVVideoCodecKey: AVVideoCodecType.h264,
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AVVideoWidthKey: NSNumber(integerLiteral: isLandscape ? 1280 : 720),
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AVVideoHeightKey: NSNumber(integerLiteral: isLandscape ? 720 : 1280),
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AVVideoScalingModeKey: AVVideoScalingModeResizeAspectFill,
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AVVideoCompressionPropertiesKey: compressionDict
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]
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exporter.audioOutputConfiguration = [
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AVFormatIDKey: kAudioFormatMPEG4AAC,
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AVEncoderBitRateKey: NSNumber(integerLiteral: 128000), // 128k
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AVNumberOfChannelsKey: NSNumber(integerLiteral: 2),
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AVSampleRateKey: NSNumber(value: Float(44100))
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]
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// needs set to LOW priority to prevent priority inverse issue
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let task = Task(priority: .utility) {
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_ = try await exportVideo(by: exporter)
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}
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_ = try await task.value
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return outputURL
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}
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private func exportVideo(by exporter: NextLevelSessionExporter) async throws -> URL {
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guard let outputURL = exporter.outputURL else {
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throw AppError.badRequest
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}
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return try await withCheckedThrowingContinuation { continuation in
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exporter.export(progressHandler: { progress in
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.videoCompressProgress = Double(progress)
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: export progress: %.2f", ((#file as NSString).lastPathComponent), #line, #function, progress)
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}
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}, completionHandler: { result in
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switch result {
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case .success(let status):
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switch status {
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case .completed:
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print("NextLevelSessionExporter, export completed, \(exporter.outputURL?.description ?? "")")
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continuation.resume(with: .success(outputURL))
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default:
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if Task.isCancelled {
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exporter.cancelExport()
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: cancel export", ((#file as NSString).lastPathComponent), #line, #function)
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}
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print("NextLevelSessionExporter, did not complete")
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}
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case .failure(let error):
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continuation.resume(with: .failure(error))
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}
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})
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}
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} // end func
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}
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