Swift无法从链接播放音频 - iOS

Question

我正在使用Subsonic，因此通过Web服务向我提供mp3文件。当我使用扩展名为.mp3的文件进行测试时，此代码可以正常工作。但是当我使用下面给出的链接时，它就不起作用了。

    var player: AVPlayer!

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = URL(string: "http://192.168.1.74:4040/rest/download?u=admin&p=admin&v=1.12.0&c=myapp&id=114&format=mp3")!
        let playerItem = CachingPlayerItem(url: url)
        playerItem.delegate = self        
        player = AVPlayer(playerItem: playerItem)
        player.automaticallyWaitsToMinimizeStalling = false
        player.play()

    }

}

浏览'url'中的链接可以提供我期望的文件。我也成功地将文件下载并保存为MP3，然后从我的文档容器中播放它，但这不是我想要的应用程序工作方式。

TL:DR：如何在没有扩展名的情况下从rest API播放音频？

- Alec.

Answer 1

你可以使用AVAssetResourceLoader来播放没有扩展名的音频。

以下是一个示例。

首先，配置resourceloader的委托。

var playerAsset: AVAsset!

if fileURL.pathExtension.count == 0 {
    var components = URLComponents(url: fileURL, resolvingAgainstBaseURL: false)!

    components.scheme = "fake" // make custom URL scheme
    components.path += ".mp3"

    playerAsset = AVURLAsset(url: components.url!)
    (playerAsset as! AVURLAsset).resourceLoader.setDelegate(self, queue: DispatchQueue.global())
} else {
    playerAsset = AVAsset(url: fileURL)
}

let playerItem = AVPlayerItem(asset: playerAsset)

然后，读取音频数据并响应资源加载器。

// MARK: - AVAssetResourceLoaderDelegate methods

func resourceLoader(_ resourceLoader: AVAssetResourceLoader, shouldWaitForLoadingOfRequestedResource loadingRequest: AVAssetResourceLoadingRequest) -> Bool {
    if let url = loadingRequest.request.url {
        var components = URLComponents(url: url, resolvingAgainstBaseURL: false)!
        components.scheme = NSURLFileScheme // replace with the real URL scheme
        components.path = String(components.path.dropLast(4))

        if let attributes = try? FileManager.default.attributesOfItem(atPath: components.url!.path),
            let fileSize = attributes[FileAttributeKey.size] as? Int64 {
            loadingRequest.contentInformationRequest?.isByteRangeAccessSupported = true
            loadingRequest.contentInformationRequest?.contentType = "audio/mpeg3"
            loadingRequest.contentInformationRequest?.contentLength = fileSize

            let requestedOffset = loadingRequest.dataRequest!.requestedOffset
            let requestedLength = loadingRequest.dataRequest!.requestedLength

            if let handle = try? FileHandle(forReadingFrom: components.url!) {
                handle.seek(toFileOffset: UInt64(requestedOffset))
                let data = handle.readData(ofLength: requestedLength)

                loadingRequest.dataRequest?.respond(with: data)
                loadingRequest.finishLoading()

                return true
            } else {
                return false
            }
        } else {
            return false
        }
    } else {
        return false
    }
}

- Bannings