Audio Visualizer

[AppDevGuy]

Add the ability to visualise the recorded audio and a basic view.

[crazypoo]

Hello,friend,I finish this topic

[huangboju]

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)
        }
    }