yumoqing
60a3369d82
根因: readAudioLoop 从文件读音频速度远快于实时，每帧 dispatch 到 MainActor 造成大量 Task 积压。用户点停止时，积压的 Task 在 isRunning=false 生效前全部执行，导致整个源音频被写入。 修复: - 音频直接在后台队列写入，不再 dispatch 到 MainActor - 增加 nonisolated(unsafe) audioStopped 标志，stopAudioCapture 先设标志让 loop 立即退出 - 增加 nonisolated(unsafe) audioFirstFrameTime 供后台线程读取 - audioInput 作为参数传入 readAudioLoop，避免跨 actor 访问
331 lines
13 KiB
Swift
331 lines
13 KiB
Swift
import AVFoundation
|
||
#if os(macOS)
|
||
import AppKit
|
||
|
||
/// 视频源录制器：从 AVPlayerItemVideoOutput 抓帧 + 源 URL 音频轨道，写入 mp4
|
||
@MainActor
|
||
final class PlayerRecorder: NSObject {
|
||
|
||
private var writer: AVAssetWriter?
|
||
private var videoInput: AVAssetWriterInput?
|
||
private var audioInput: AVAssetWriterInput?
|
||
private var timer: Timer?
|
||
private var startDate: Date?
|
||
private var weakOutput: AVPlayerItemVideoOutput?
|
||
private var firstFrameTime: CMTime?
|
||
private var audioReader: AVAssetReader?
|
||
private var audioReaderOutput: AVAssetReaderTrackOutput?
|
||
private var audioCaptureQueue: DispatchQueue?
|
||
private var isRunning = false
|
||
/// 线程安全的音频停止标志，后台队列直接读取
|
||
nonisolated(unsafe) private var audioStopped: Bool = false
|
||
/// 音频线程读取 firstFrameTime 的镜像
|
||
nonisolated(unsafe) private var audioFirstFrameTime: CMTime?
|
||
|
||
@Published var isRecording = false
|
||
@Published var durationText = "00:00"
|
||
|
||
var onRecordingSaved: ((URL) -> Void)?
|
||
var onError: ((String) -> Void)?
|
||
|
||
private var tempURL: URL?
|
||
|
||
private var saveDirectory: URL {
|
||
let movies = FileManager.default.urls(for: .moviesDirectory, in: .userDomainMask).first!
|
||
let dir = movies.appendingPathComponent("MiniPlayer", isDirectory: true)
|
||
try? FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
|
||
return dir
|
||
}
|
||
|
||
/// 开始录制
|
||
func startRecording(from output: AVPlayerItemVideoOutput, sourceURL: URL, startTime: CMTime) {
|
||
guard !isRecording else { return }
|
||
|
||
weakOutput = output
|
||
firstFrameTime = nil
|
||
isRunning = false
|
||
audioStopped = false
|
||
|
||
// 临时文件
|
||
let formatter = DateFormatter()
|
||
formatter.dateFormat = "yyyy-MM-dd_HH-mm-ss"
|
||
let filename = "Recording_\(formatter.string(from: Date())).mp4"
|
||
let url = saveDirectory.appendingPathComponent(filename)
|
||
tempURL = url
|
||
|
||
do {
|
||
writer = try AVAssetWriter(outputURL: url, fileType: .mp4)
|
||
} catch {
|
||
onError?("Cannot create writer: \(error.localizedDescription)")
|
||
return
|
||
}
|
||
|
||
guard let writer = writer else { return }
|
||
|
||
// 视频输入
|
||
let videoSettings: [String: Any] = [
|
||
AVVideoCodecKey: AVVideoCodecType.h264,
|
||
AVVideoWidthKey: 1920,
|
||
AVVideoHeightKey: 1080
|
||
]
|
||
let vInput = AVAssetWriterInput(mediaType: .video, outputSettings: videoSettings)
|
||
vInput.expectsMediaDataInRealTime = true
|
||
if writer.canAdd(vInput) {
|
||
writer.add(vInput)
|
||
videoInput = vInput
|
||
}
|
||
|
||
// 音频输入
|
||
let audioSettings: [String: Any] = [
|
||
AVFormatIDKey: kAudioFormatMPEG4AAC,
|
||
AVSampleRateKey: 44100,
|
||
AVNumberOfChannelsKey: 2,
|
||
AVEncoderBitRateKey: 128000
|
||
]
|
||
let aInput = AVAssetWriterInput(mediaType: .audio, outputSettings: audioSettings)
|
||
aInput.expectsMediaDataInRealTime = true
|
||
if writer.canAdd(aInput) {
|
||
writer.add(aInput)
|
||
audioInput = aInput
|
||
}
|
||
|
||
writer.startWriting()
|
||
|
||
// 启动视频抓帧
|
||
isRecording = true
|
||
isRunning = true // 必须在 startCaptureLoop 之前设置
|
||
startTimer()
|
||
startCaptureLoop()
|
||
|
||
// 启动音频读取（从源 URL）
|
||
startAudioCapture(sourceURL: sourceURL, startTime: startTime, audioWriterInput: aInput)
|
||
}
|
||
|
||
/// 停止录制
|
||
func stopRecording() {
|
||
guard isRecording else { return }
|
||
isRecording = false
|
||
isRunning = false
|
||
captureTimer?.invalidate()
|
||
captureTimer = nil
|
||
stopTimer()
|
||
stopAudioCapture()
|
||
|
||
videoInput?.markAsFinished()
|
||
audioInput?.markAsFinished()
|
||
|
||
writer?.finishWriting { [weak self] in
|
||
Task { @MainActor in
|
||
guard let self = self else { return }
|
||
if let url = self.tempURL {
|
||
self.showSaveDialog(tempURL: url)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// MARK: - 视频抓帧
|
||
private var captureTimer: Timer?
|
||
|
||
private func startCaptureLoop() {
|
||
// 用 Timer 每 1/30 秒抓一帧
|
||
captureTimer = Timer.scheduledTimer(withTimeInterval: 1.0 / 30.0, repeats: true) { [weak self] _ in
|
||
Task { @MainActor in
|
||
self?.captureVideoFrame()
|
||
}
|
||
}
|
||
}
|
||
|
||
private func captureVideoFrame() {
|
||
guard let output = weakOutput, let input = videoInput, input.isReadyForMoreMediaData else { return }
|
||
|
||
let hostTime = CACurrentMediaTime()
|
||
let itemTime = output.itemTime(forHostTime: hostTime)
|
||
|
||
guard output.hasNewPixelBuffer(forItemTime: itemTime),
|
||
let pb = output.copyPixelBuffer(forItemTime: itemTime, itemTimeForDisplay: nil) else { return }
|
||
|
||
// 第一帧：用它的时间作为 session 起点
|
||
if firstFrameTime == nil {
|
||
firstFrameTime = itemTime
|
||
audioFirstFrameTime = itemTime // 同步给音频线程
|
||
writer?.startSession(atSourceTime: itemTime)
|
||
isRunning = true
|
||
}
|
||
|
||
// 相对时间戳
|
||
guard let firstTime = firstFrameTime else { return }
|
||
let relativeTime = CMTimeSubtract(itemTime, firstTime)
|
||
|
||
guard relativeTime.seconds >= 0 else { return }
|
||
|
||
let sampleBuffer = Self.createSampleBuffer(from: pb, time: relativeTime)
|
||
if let sb = sampleBuffer {
|
||
_ = input.append(sb)
|
||
}
|
||
}
|
||
|
||
private static func createSampleBuffer(from pixelBuffer: CVPixelBuffer, time: CMTime) -> CMSampleBuffer? {
|
||
var info = CMSampleTimingInfo()
|
||
info.presentationTimeStamp = time
|
||
info.duration = CMTime(value: 1, timescale: 30)
|
||
info.decodeTimeStamp = .invalid
|
||
|
||
var formatDescription: CMFormatDescription?
|
||
CMVideoFormatDescriptionCreateForImageBuffer(allocator: kCFAllocatorDefault, imageBuffer: pixelBuffer, formatDescriptionOut: &formatDescription)
|
||
|
||
guard let fd = formatDescription else { return nil }
|
||
|
||
var sampleBuffer: CMSampleBuffer?
|
||
CMSampleBufferCreateReadyWithImageBuffer(allocator: kCFAllocatorDefault, imageBuffer: pixelBuffer, formatDescription: fd, sampleTiming: &info, sampleBufferOut: &sampleBuffer)
|
||
return sampleBuffer
|
||
}
|
||
|
||
// MARK: - 音频读取（从源 URL）
|
||
private func startAudioCapture(sourceURL: URL, startTime: CMTime, audioWriterInput: AVAssetWriterInput) {
|
||
let asset = AVURLAsset(url: sourceURL)
|
||
|
||
Task {
|
||
do {
|
||
let audioTracks = try await asset.loadTracks(withMediaType: .audio)
|
||
guard let audioTrack = audioTracks.first else {
|
||
print("[Recorder] No audio track in source")
|
||
return
|
||
}
|
||
|
||
let reader = try AVAssetReader(asset: asset)
|
||
let output = AVAssetReaderTrackOutput(track: audioTrack, outputSettings: [
|
||
AVFormatIDKey: kAudioFormatLinearPCM,
|
||
AVSampleRateKey: 44100,
|
||
AVNumberOfChannelsKey: 2,
|
||
AVLinearPCMBitDepthKey: 16,
|
||
AVLinearPCMIsFloatKey: false,
|
||
AVLinearPCMIsBigEndianKey: false,
|
||
AVLinearPCMIsNonInterleaved: false
|
||
])
|
||
output.alwaysCopiesSampleData = false
|
||
|
||
// 从播放位置开始读取
|
||
reader.timeRange = CMTimeRange(start: startTime, duration: .positiveInfinity)
|
||
|
||
if reader.canAdd(output) {
|
||
reader.add(output)
|
||
reader.startReading()
|
||
|
||
self.audioReader = reader
|
||
self.audioReaderOutput = output
|
||
|
||
// 后台线程读取音频
|
||
let queue = DispatchQueue(label: "recorder.audio.capture")
|
||
self.audioCaptureQueue = queue
|
||
queue.async { [weak self] in
|
||
guard let self = self, let aInput = self.audioInput else { return }
|
||
self.readAudioLoop(reader: reader, output: output, audioInput: aInput)
|
||
}
|
||
}
|
||
} catch {
|
||
print("[Recorder] Audio capture setup failed: \(error)")
|
||
}
|
||
}
|
||
}
|
||
|
||
private nonisolated func readAudioLoop(reader: AVAssetReader, output: AVAssetReaderTrackOutput, audioInput: AVAssetWriterInput) {
|
||
while !audioStopped && reader.status == .reading {
|
||
guard let sampleBuffer = output.copyNextSampleBuffer() else {
|
||
break
|
||
}
|
||
|
||
// 直接在后台队列处理，不走 MainActor（避免队列积压）
|
||
guard let firstTime = audioFirstFrameTime else {
|
||
// 视频第一帧还没到，跳过这个音频 buffer
|
||
continue
|
||
}
|
||
guard audioInput.isReadyForMoreMediaData else { continue }
|
||
|
||
let pts = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)
|
||
let relativeTime = CMTimeSubtract(pts, firstTime)
|
||
guard relativeTime.seconds >= 0 else { continue }
|
||
|
||
// 重建 sample buffer with new time
|
||
var count: CMItemCount = 0
|
||
CMSampleBufferGetSampleTimingInfoArray(sampleBuffer, entryCount: 0, arrayToFill: nil, entriesNeededOut: &count)
|
||
var timingInfo = [CMSampleTimingInfo](repeating: CMSampleTimingInfo(), count: count)
|
||
CMSampleBufferGetSampleTimingInfoArray(sampleBuffer, entryCount: count, arrayToFill: &timingInfo, entriesNeededOut: nil)
|
||
|
||
for i in 0..<count {
|
||
timingInfo[i].decodeTimeStamp = .invalid
|
||
timingInfo[i].presentationTimeStamp = CMTimeSubtract(timingInfo[i].presentationTimeStamp, firstTime)
|
||
}
|
||
|
||
var newBuffer: CMSampleBuffer?
|
||
CMSampleBufferCreateCopyWithNewTiming(allocator: kCFAllocatorDefault, sampleBuffer: sampleBuffer, sampleTimingEntryCount: count, sampleTimingArray: &timingInfo, sampleBufferOut: &newBuffer)
|
||
|
||
if let nb = newBuffer {
|
||
_ = audioInput.append(nb)
|
||
}
|
||
}
|
||
}
|
||
|
||
private func stopAudioCapture() {
|
||
audioStopped = true // 先设标志，loop 立即退出
|
||
audioReader?.cancelReading()
|
||
audioReader = nil
|
||
audioReaderOutput = nil
|
||
}
|
||
|
||
// MARK: - Timer
|
||
private func startTimer() {
|
||
startDate = Date()
|
||
durationText = "00:00"
|
||
timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { [weak self] _ in
|
||
Task { @MainActor in
|
||
guard let self = self, let start = self.startDate else { return }
|
||
let elapsed = Int(Date().timeIntervalSince(start))
|
||
let m = elapsed / 60
|
||
let s = elapsed % 60
|
||
let h = m / 60
|
||
if h > 0 {
|
||
self.durationText = String(format: "%d:%02d:%02d", h, m % 60, s)
|
||
} else {
|
||
self.durationText = String(format: "%02d:%02d", m, s)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
private func stopTimer() {
|
||
timer?.invalidate()
|
||
timer = nil
|
||
startDate = nil
|
||
durationText = "00:00"
|
||
}
|
||
|
||
// MARK: - 保存对话框
|
||
private func showSaveDialog(tempURL: URL) {
|
||
let panel = NSSavePanel()
|
||
panel.nameFieldStringValue = tempURL.lastPathComponent
|
||
panel.allowedContentTypes = [.mpeg4Movie]
|
||
panel.directoryURL = saveDirectory
|
||
panel.title = "Save Recording"
|
||
|
||
panel.begin { [weak self] response in
|
||
guard let self = self else { return }
|
||
if response == .OK, let destURL = panel.url {
|
||
do {
|
||
if FileManager.default.fileExists(atPath: destURL.path) {
|
||
try FileManager.default.removeItem(at: destURL)
|
||
}
|
||
try FileManager.default.moveItem(at: tempURL, to: destURL)
|
||
self.onRecordingSaved?(destURL)
|
||
} catch {
|
||
self.onError?("Save failed: \(error.localizedDescription)")
|
||
}
|
||
} else {
|
||
try? FileManager.default.removeItem(at: tempURL)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
#endif
|