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012-iOS捕获系统播放音频

  • 2026-03-01 12:07:42
012-iOS捕获系统播放音频

这篇是iOS双语字幕软件的开发日志,目标是在iOS端实现在观看视频时,实时对播放的内容进行识别和翻译,显示双语字幕,用于打破外语视频内容观看门槛。

模块流程

捕获系统播放音频
语音识别ASR
语言翻译
双语字幕

iOS音频捕获与数据共享

本文介绍iOS系统音频捕获的实现方案,使用Broadcast Upload Extension捕获系统播放的音频,并通过App Group与主应用共享数据。

目录

  • • 一、系统音频捕获
    • • Broadcast Upload Extension配置
    • • 启动与关闭
    • • 音频格式转换
  • • 二、Extension与主应用数据共享
    • • App Group配置
    • • 数据读写实现
    • • Darwin通知

一、系统音频捕获

iOS系统出于安全和隐私考虑,不允许应用直接捕获系统音频(如视频播放、音乐等,使用通话模式的APP播放的声音捕获不到)。必须使用Broadcast Upload Extension,通过屏幕录制的形式获取音频数据。

Broadcast Upload Extension配置

要让Extension收到ReplayKit的数据,必须同时满足:

  1. 1. 工程里有Broadcast Upload Extension target
  2. 2. 主App用系统UI启动broadcast
  3. 3. Extension的Info.plist / Capabilities / 类继承全部正确

创建步骤:

  1. 1. 在Xcode中新建Extension类型中选择Broadcast Upload Extension
  2. 2. 配置Info.plist:
<key>NSExtension</key><dict>    <key>NSExtensionPointIdentifier</key>    <string>com.apple.broadcast-services-upload</string>    <key>NSExtensionPrincipalClass</key>    <string>$(PRODUCT_MODULE_NAME).SampleHandler</string></dict>
  1. 3. 主App配置UIBackgroundModes:
<key>UIBackgroundModes</key><array>    <string>audio</string></array>

注意:未配置audio可能导致音频接收不到或屏幕锁定后Extension被暂停。

启动与关闭

Broadcast upload extension不能在代码中直接启动,只能由系统UI触发。Extension只能自己调用finishBroadcastWithError关闭,主App只能"间接控制"关闭。

let picker = RPSystemBroadcastPickerView(    frame: CGRect(x: 0, y: 0, width: 44, height: 44))picker.preferredExtension = "com.xxx.broadcast"picker.showsMicrophoneButton = trueview.addSubview(picker)

音频格式转换

语音识别引擎接收的音频格式需要是16kHz单声道音频,因此这里需要先进行格式转换。这里需要注意是,并没有官方文档说ReplayKit回调的数据格式类型是怎样的,因此这里需要兼容各种格式。

格式检测与提取:

override func processSampleBuffer(_ sampleBuffer: CMSampleBuffer, with sampleBufferType: RPSampleBufferType) {    guard case .audioApp = sampleBufferType else { return }    guard let formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer),          let streamDesc = CMAudioFormatDescriptionGetStreamBasicDescription(formatDescription)?.pointee else {        return    }    let inputSampleRate = streamDesc.mSampleRate    let channelCount = Int(streamDesc.mChannelsPerFrame)    let bitsPerChannel = streamDesc.mBitsPerChannel    let formatFlags = streamDesc.mFormatFlags    let isFloat = (formatFlags & kAudioFormatFlagIsFloat) != 0    let isNonInterleaved = (formatFlags & kAudioFormatFlagIsNonInterleaved) != 0    let isBigEndian = (formatFlags & kAudioFormatFlagIsBigEndian) != 0    // 提取音频数据...}

完整的音频处理实现:

private let targetSampleRate: Double = 16000.0/// 处理音频样本bufferprivate func processAudioBuffer(_ sampleBuffer: CMSampleBuffer, source: String) {    guard let formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer),          let streamDesc = CMAudioFormatDescriptionGetStreamBasicDescription(formatDescription)?.pointee else {        return    }    let inputSampleRate = streamDesc.mSampleRate    let channelCount = Int(streamDesc.mChannelsPerFrame)    let bitsPerChannel = streamDesc.mBitsPerChannel    let formatFlags = streamDesc.mFormatFlags    let isFloat = (formatFlags & kAudioFormatFlagIsFloat) != 0    let isNonInterleaved = (formatFlags & kAudioFormatFlagIsNonInterleaved) != 0    let isBigEndian = (formatFlags & kAudioFormatFlagIsBigEndian) != 0    // 获取 AudioBufferList    var audioBufferList = AudioBufferList()    var blockBuffer: CMBlockBuffer?    let status = CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(        sampleBuffer,        bufferListSizeNeededOut: nil,        bufferListOut: &audioBufferList,        bufferListSize: MemoryLayout<AudioBufferList>.size,        blockBufferAllocator: nil,        blockBufferMemoryAllocator: nil,        flags: kCMSampleBufferFlag_AudioBufferList_Assure16ByteAlignment,        blockBufferOut: &blockBuffer    )    guard status == noErr else { return }    let audioBufferListPointer = UnsafeMutableAudioBufferListPointer(        UnsafeMutablePointer<AudioBufferList>.allocate(capacity: 1)    )    defer {        audioBufferListPointer.unsafeMutablePointer.deallocate()    }    let numBuffers = audioBufferListPointer.count    let frameCount = CMSampleBufferGetNumSamples(sampleBuffer)    var floatSamples: [Float] = []    // 处理非交错格式    if isNonInterleaved {        var channelData: [[Float]] = []        for bufferIndex in 0..<numBuffers {            let buffer = audioBufferListPointer[bufferIndex]            guard let data = buffer.mData else { continue }            let dataByteSize = Int(buffer.mDataByteSize)            var channelSamples: [Float] = []            if isFloat && bitsPerChannel == 32 {                let floatPtr = data.assumingMemoryBound(to: Float.self)                let count = dataByteSize / MemoryLayout<Float>.size                for i in 0..<count {                    var value = floatPtr[i]                    if isBigEndian {                        value = Float(bitPattern: value.bitPattern.bigEndian)                    }                    channelSamples.append(value)                }            } else if bitsPerChannel == 16 {                let int16Ptr = data.assumingMemoryBound(to: Int16.self)                let count = dataByteSize / MemoryLayout<Int16>.size                for i in 0..<count {                    var value = int16Ptr[i]                    if isBigEndian { value = value.bigEndian }                    channelSamples.append(Float(value) / 32768.0)                }            }            channelData.append(channelSamples)        }        // 混音为单声道        if let firstChannel = channelData.first {            if channelData.count == 1 {                floatSamples = firstChannel            } else {                for i in 0..<firstChannel.count {                    var sum: Float = 0                    for ch in channelData where i < ch.count {                        sum += ch[i]                    }                    floatSamples.append(sum / Float(channelData.count))                }            }        }    } else {        // 交错格式处理...    }    // 重采样到16kHz    if inputSampleRate != targetSampleRate {        floatSamples = resample(floatSamples, from: inputSampleRate, to: targetSampleRate)    }    sharedBuffer.writeAudioSamples(floatSamples)}/// 使用AVAudioConverter重采样private func resample(_ samples: [Float], from inputRate: Double, to outputRate: Double) -> [Float] {    guard inputRate > 0 && outputRate > 0, inputRate != outputRate, !samples.isEmpty else {        return samples    }    guard let inputFormat = AVAudioFormat(        commonFormat: .pcmFormatFloat32, sampleRate: inputRate, channels: 1, interleaved: false    ),    let outputFormat = AVAudioFormat(        commonFormat: .pcmFormatFloat32, sampleRate: outputRate, channels: 1, interleaved: false    ),    let converter = AVAudioConverter(from: inputFormat, to: outputFormat) else {        return samples    }    guard let inputBuffer = AVAudioPCMBuffer(pcmFormat: inputFormat, frameCapacity: AVAudioFrameCount(samples.count)),          let outputBuffer = AVAudioPCMBuffer(pcmFormat: outputFormat) else {        return samples    }    inputBuffer.frameLength = AVAudioFrameCount(samples.count)    let inputData = inputBuffer.floatChannelData!    for i in 0..<samples.count { inputData[0][i] = samples[i] }    let ratio = outputRate / inputRate    let outputFrameCount = Int(ceil(Double(samples.count) * ratio))    outputBuffer.frameCapacity = AVAudioFrameCount(outputFrameCount)    var error: NSError?    let status = converter.convert(to: outputBuffer, error: &error) { _, outStatus in        outStatus.pointee = .haveData        return inputBuffer    }    guard status == .haveData, error == nil else { return samples }    let outputData = outputBuffer.floatChannelData!    let outputLength = Int(outputBuffer.frameLength)    return (0..<outputLength).map { outputData[0][$0] }}

实现要点:

  1. 1. 内存安全:使用 UnsafeMutableAudioBufferListPointer 和 defer 确保内存正确释放
  2. 2. 多格式支持:支持 Float32、Int16、Int32 格式
  3. 3. 字节序处理:支持大端和小端字节序
  4. 4. 非交错格式:正确处理每个通道独立 buffer 的格式
  5. 5. 混音:立体声自动混音为单声道
  6. 6. 高质量重采样:使用系统 AVAudioConverter

二、Extension与主应用数据共享

Broadcast Extension与主应用运行在不同进程,涉及到进程间通信,这里选择使用实现比较简单的App Group共享容器进行数据交换。

App Group配置

Entitlements配置:

<key>com.apple.security.application-groups</key><array>    <string>group.com.xxx.shared</string></array>

需要在Apple Developer Portal创建App Group,并在XCode中为两个target启用。

数据读写实现

class AudioSharedBuffer {    static let appGroupId = "group.com.xxx.shared"    private let sharedContainerURL = FileManager.default.containerURL(        forSecurityApplicationGroupIdentifier: Self.appGroupId    )    // Extension写入处理后的音频    func writeAudioSamples(_ samples: [Float]) {        guard let url = sharedContainerURL?.appendingPathComponent("audio.raw") else { return }        let data = samples.withUnsafeBufferPointer { Data(buffer: $0) }        if FileManager.default.fileExists(atPath: url.path) {            let handle = try? FileHandle(forWritingTo: url)            handle?.seekToEndOfFile()            handle?.write(data)            handle?.closeFile()        } else {            try? data.write(to: url)        }        postDarwinNotification("com.xxx.newAudioData")    }    // 主应用读取音频    func readAudioSamples() -> [Float]? {        guard let url = sharedContainerURL?.appendingPathComponent("audio.raw"),              FileManager.default.fileExists(atPath: url.path) else { return nil }        let data = try? Data(contentsOf: url)        try? FileManager.default.removeItem(at: url)        let floatCount = data?.count ?? 0 / MemoryLayout<Float>.size        var samples = [Float](repeating: 0, count: floatCount)        data?.copyBytes(to: samples.withUnsafeMutableBufferPointer { $0 })        return samples    }    private func postDarwinNotification(_ name: String) {        let center = CFNotificationCenterGetDarwinNotifyCenter()        CFNotificationCenterPostNotification(center, CFNotificationName(name as CFString),            nil, nil, true)    }}

Darwin通知

Extension写入数据后发送Darwin通知,主应用监听后立即读取:

func startListening() {    CFNotificationCenterAddObserver(        CFNotificationCenterGetDarwinNotifyCenter(),        Unmanaged.passUnretained(self).toOpaque(),        { _, observer, _, _, _ in            guard let observer = observer else { return }            let selfPtr = Unmanaged<YourClass>.fromOpaque(observer).takeUnretainedValue()            if let samples = selfPtr.audioBuffer.readAudioSamples() {                selfPtr.onAudioReceived?(samples)            }        },        "com.xxx.newAudioData" as CFString,        nil,        .deliverImmediately    )}

SampleHandler完整示例

class SampleHandler: RPBroadcastSampleHandler {    private let sharedBuffer = AudioSharedBuffer()    private let targetSampleRate: Double = 16000.0    override func broadcastStarted(withSetupInfo setupInfo: [String : NSObject]?) {        sharedBuffer.clearAudioData()    }    override func broadcastPaused() {}    override func broadcastResumed() {}    override func broadcastFinished() {}    override func processSampleBuffer(_ sampleBuffer: CMSampleBuffer,                                     with sampleBufferType: RPSampleBufferType) {        switch sampleBufferType {        case .audioApp:            // 处理应用音频(系统播放的音频)            let samples = convertTo16kMono(sampleBuffer)            sharedBuffer.writeAudioSamples(samples)        case .audioMic:            // 忽略麦克风音频            break        case .video:            // 忽略视频            break        }    }}

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  1. CONNECT:[ UseTime:0.000613s ] mysql:host=127.0.0.1;port=3306;dbname=c_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000694s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001442s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000311s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000674s ]
  6. SELECT * FROM `set` [ RunTime:0.000258s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000803s ]
  8. SELECT * FROM `article` WHERE `id` = 469345 LIMIT 1 [ RunTime:0.005370s ]
  9. UPDATE `article` SET `lasttime` = 1772560169 WHERE `id` = 469345 [ RunTime:0.006536s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000316s ]
  11. SELECT * FROM `article` WHERE `id` < 469345 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000513s ]
  12. SELECT * FROM `article` WHERE `id` > 469345 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001574s ]
  13. SELECT * FROM `article` WHERE `id` < 469345 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000968s ]
  14. SELECT * FROM `article` WHERE `id` < 469345 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004434s ]
  15. SELECT * FROM `article` WHERE `id` < 469345 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007020s ]
0.171717s