如何在AVPlayer中查看音频通道计数？

import AVFoundation

// 获取AVPlayer的当前播放项
let playerItem = player.currentItem

// 获取音频轨道
guard let audioTrack = playerItem?.asset.tracks(withMediaType: .audio).first else {
    print("No audio track found")
    return
}

// 获取音频格式描述数组
let formatDescriptions = audioTrack.formatDescriptions as! [CMAudioFormatDescription]

// 遍历音频格式描述数组
for formatDescription in formatDescriptions {
    // 获取音频流描述
    let audioStreamDescription = formatDescription.streamBasicDescription.pointee
    
    // 获取音频通道计数
    let channelCount = audioStreamDescription.mChannelsPerFrame
    
    print("Audio channel count: \(channelCount)")
}