Audio Visualizer #22

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1. AppDevGuy

   added

   enhancementNew feature or requestNew feature or request

   In ProgressTasks that are in progressTasks that are in progress

   v0.4Version 0.4Version 0.4

   on Aug 24, 2020
2. AppDevGuy

   added this to the Version 0.4 milestone on Aug 24, 2020
3. AppDevGuy

   self-assigned this

   on Aug 24, 2020
4. crazypoo commented on Mar 21, 2023

   

   crazypoo

   on Mar 21, 2023

   More actions

   Hello,friend,I finish this topic
5. huangboju commented on Jul 19, 2025

   

   huangboju

   on Jul 19, 2025

   More actions

   This is my solution

   input.installTap(onBus: bus, bufferSize: 8192, format: recordingFormat) { [weak self] (buffer, _) -> Void in
               var newBufferAvailable = true
               let inputCallback: AVAudioConverterInputBlock = { _, outStatus in
                   if newBufferAvailable {
                       outStatus.pointee = .haveData
                       newBufferAvailable = false
                       return buffer
                   } else {
                       outStatus.pointee = .noDataNow
                       return nil
                   }
               }
               let convertedBuffer = AVAudioPCMBuffer(pcmFormat: outputFormat, frameCapacity: AVAudioFrameCount(outputFormat.sampleRate) * buffer.frameLength / AVAudioFrameCount(buffer.format.sampleRate))!
               var error: NSError?
               let status = converter.convert(to: convertedBuffer, error: &error, withInputFrom: inputCallback)
               if status == .error {
                   self?.delegate?.didFailToCommenceSpeechRecording()
                   self?.delegate?.didFailToProcessRequest(withError: OSSSpeechKitErrorType.invalidAudioEngine.error)
                   if let err = error {
                       self?.debugLog(object: self as Any, message: "Audio Engine conversion error: \(err)")
                   }
                   return
               }
               self?.request?.append(convertedBuffer)
               self?.processAudioBuffer(convertedBuffer)
           }
   
   private func processAudioBuffer(_ buffer: AVAudioPCMBuffer) {
           guard let channelData = buffer.floatChannelData?[0] else { return }
   
           let channelDataValue = channelData
           let channelDataValueArray = stride(from: 0, to: Int(buffer.frameLength), by: buffer.stride).map { channelDataValue[$0] }
   
           // 计算RMS (Root Mean Square) 音量
           let rms = sqrt(channelDataValueArray.map { $0 * $0 }.reduce(0, +) / Float(channelDataValueArray.count))
   
           // 转换为分贝并标准化
           let decibels = min(max(20 * log10(rms), -60), 0)
   
           let normalizedVolume = (decibels + 60) / 60.0 // 标准化到 0-1 范围
   
           DispatchQueue.main.async {
               self.delegate?.didProcessAudioBuffer(normalizedVolume)
           }
       }