将现有 Blob 复制到媒体服务资产中Copying existing blobs into a Media Services Asset

• 09/07/2020
• • 

本文介绍如何使用 Azure 媒体服务 .NET SDK 扩展将 Blob 从存储帐户复制到新的 Azure 媒体服务 (AMS) 资产中。This article shows how to copy blobs from a storage account into a new Azure Media Services (AMS) asset using Azure Media Services .NET SDK Extensions.

在不使用媒体服务 API 的情况下，不应该尝试更改媒体服务生成的 BLOB 容器内容。You should not attempt to change the contents of blob containers that were generated by Media Services without using Media Service APIs.

扩展方法可以处理：The extension methods work with:

• 常规资产。Regular assets.
• 实时存档资产（FragBlob 格式）。Live archive assets (FragBlob format).
• 属于不同媒体服务帐户的源和目标资产（甚至跨不同数据中心）。Source and destination assets belonging to different Media Services accounts (even across different data centers). 但是，这样做可能会产生费用。However, there may be charges incurred by doing so. 有关定价的详细信息，请参阅数据传输。For more information about pricing, see Data Transfers.

本文演示两个代码示例：The article shows two code samples:

1. 将一个 AMS 帐户的资产中的 Blob 复制到另一个 AMS 帐户的新资产中。Copy blobs from an asset in one AMS account into a new asset in another AMS account.
2. 将某个存储帐户中的 Blob 复制到某个 AMS 帐户的新资产中。Copy blobs from some storage account into a new asset in an AMS account.

在两个 AMS 帐户之间复制 BlobCopy blobs between two AMS accounts

必备条件Prerequisites

两个媒体服务帐户。Two Media Services accounts. 请参阅如何创建媒体服务帐户一文。See the article How to Create a Media Services Account.

下载示例Download sample

可以执行本文中的步骤，也可以从此处下载包含本文中所述代码的示例。You can follow the steps in this article or you can download a sample that contains the code described in this article from here.

设置项目Set up your project

1. 按照使用 .NET 进行媒体服务开发中所述来设置开发环境。Set up your development environment as described in Media Services development with .NET.
2. 将 appSettings 节添加到 .config 文件，并根据媒体服务帐户、目标存储帐户和源资产 ID 更新值。Add the appSettings section to the .config file and update the values based on your Media Services accounts, the destination storage account, and the source asset ID.

<appSettings>
    <add key="AMSSourceAADTenantDomain" value="tenant"/>
    <add key="AMSSourceRESTAPIEndpoint" value="endpoint"/>

    <add key="SourceAMSClientId" value="clientID"/>
    <add key="SourceAMSClientSecret" value="clientSecret"/>

    <add key="SourceAssetID" value="nb:cid:UUID:<id>"/>

    <add key="AMSDestAADTenantDomain" value="tenant"/>
    <add key="AMSDestRESTAPIEndpoint" value="endpoint"/>

    <add key="DestAMSClientId" value="clientID"/>
    <add key="DestAMSClientSecret" value="clientSecret"/>

    <add key="DestStorageAccountName" value="name"/>
    <add key="DestStorageAccountKey" value="key"/>

</appSettings>

将一个 AMS 帐户的资产中的 Blob 复制到另一个 AMS 帐户的资产中Copy blobs from an asset in one AMS account into an asset in another AMS account

以下代码使用单个扩展通过扩展的 IAsset.Copy 方法将源资产中的所有文件复制到目标资产。The following code uses extension IAsset.Copy method to copy all files in the source asset into the destination asset using a single extension.

using System;
using Microsoft.WindowsAzure.MediaServices.Client;
using System.Linq;
using System.Configuration;
using Microsoft.WindowsAzure.Storage.Auth;

namespace CopyExistingBlobsIntoAsset
{
    class Program
    {
        static string _sourceAADTenantDomain = 
            ConfigurationManager.AppSettings["AMSSourceAADTenantDomain"];
        static string _sourceRESTAPIEndpoint = 
            ConfigurationManager.AppSettings["AMSSourceRESTAPIEndpoint"];
        static string _sourceClientId = 
            ConfigurationManager.AppSettings["SourceAMSClientId"];
        static string _sourceClientSecret = 
            ConfigurationManager.AppSettings["SourceAMSClientSecret"];

        static string _destAADTenantDomain = 
            ConfigurationManager.AppSettings["AMSDestAADTenantDomain"];
        static string _destRESTAPIEndpoint = 
            ConfigurationManager.AppSettings["AMSDestRESTAPIEndpoint"];
        static string _destClientId = 
            ConfigurationManager.AppSettings["DestAMSClientId"];
        static string _destClientSecret = 
            ConfigurationManager.AppSettings["DestAMSClientSecret"];

        static string _destStorageAccountName = 
            ConfigurationManager.AppSettings["DestStorageAccountName"];
        static string _destStorageAccountKey = 
            ConfigurationManager.AppSettings["DestStorageAccountKey"];
        static string _sourceAssetID = 
            ConfigurationManager.AppSettings["SourceAssetID"];

        private static CloudMediaContext _sourceContext = null;
        private static CloudMediaContext _destContext = null;

        static void Main(string[] args)
        {
            AzureAdTokenCredentials tokenCredentials1 = new AzureAdTokenCredentials(_sourceAADTenantDomain,
                   new AzureAdClientSymmetricKey(_sourceClientId, _sourceClientSecret),
                   AzureEnvironments.AzureChinaCloudEnvironment);

            AzureAdTokenCredentials tokenCredentials2 = new AzureAdTokenCredentials(_destAADTenantDomain,
                   new AzureAdClientSymmetricKey(_destClientId, _destClientSecret),
                   AzureEnvironments.AzureChinaCloudEnvironment);

            var tokenProvider1 = new AzureAdTokenProvider(tokenCredentials1);
            var tokenProvider2 = new AzureAdTokenProvider(tokenCredentials2);

            // Create the context for your source Media Services account.
            _sourceContext = new CloudMediaContext(new Uri(_sourceRESTAPIEndpoint), tokenProvider1);

            // Create the context for your destination Media Services account.
            _destContext = new CloudMediaContext(new Uri(_destRESTAPIEndpoint), tokenProvider2);

            // Get the credentials of the default Storage account bound to your destination Media Services account.
            StorageCredentials destinationStorageCredentials =
                new StorageCredentials(_destStorageAccountName, _destStorageAccountKey);

            // Get a reference to the source asset in the source context.
            IAsset sourceAsset = _sourceContext.Assets.Where(asset => asset.Id == _sourceAssetID).First();

            // Create an empty destination asset in the destination context.
            IAsset destinationAsset = _destContext.Assets.Create(sourceAsset.Name, AssetCreationOptions.None);

            // Copy the files in the source asset instance into the destination asset instance.
            // There is an additional overload with async support.
            sourceAsset.Copy(destinationAsset, destinationStorageCredentials);

            Console.WriteLine("Done");
        }
    }
}

将存储帐户中的 Blob 复制到 AMS 帐户中Copy blobs from a storage account into an AMS account

必备条件Prerequisites

• 一个要从中复制 Blob 的存储帐户。One Storage account from which you want to copy blobs.
• 一个要将 Blob 复制到的 AMS 帐户。One AMS account into which you want to copy blobs.

设置项目Set up your project

1. 按照使用 .NET 进行媒体服务开发中所述来设置开发环境。Set up your development environment as described in Media Services development with .NET.
2. 将 appSettings 节添加到 .config 文件，并根据源存储帐户和目标 AMS 帐户更新值。Add the appSettings section to the .config file and update the values based on your source storage and destination AMS accounts.

<appSettings>
    <add key="SourceStorageAccountName" value="name" />
    <add key="SourceStorageAccountKey" value="key" />
    <add key="NameOfBlobContainerYouWantToCopy" value="BlobContainerName"/>
    
    <add key="AMSAADTenantDomain" value="tenant"/>
    <add key="AMSRESTAPIEndpoint" value="endpoint"/>
    <add key="AMSClientId" value="clientID"/>
    <add key="AMSClientSecret" value="clientSecret"/>
    <add key="AMSStorageAccountName" value="name"/>
    <add key="AMSStorageAccountKey" value="key"/>
</appSettings>

将某个存储帐户中的 blob 复制到 AMS 帐户的新资产中Copy blobs from some storage account into a new asset in an AMS account

以下代码将存储帐户中的 Blob 复制到媒体服务资产中。The following code copies blobs from a storage account into a Media Services asset.

using System;
using System.Configuration;
using System.Linq;
using Microsoft.WindowsAzure.MediaServices.Client;
using Microsoft.WindowsAzure.Storage.Auth;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
    
namespace CopyExistingBlobsIntoAsset
{
    class Program
    {
        // Read values from the App.config file.
        private static readonly string _sourceStorageAccountName =
            ConfigurationManager.AppSettings["SourceStorageAccountName"];
        private static readonly string _sourceStorageAccountKey =
            ConfigurationManager.AppSettings["SourceStorageAccountKey"];
        private static readonly string _NameOfBlobContainerYouWantToCopy =
            ConfigurationManager.AppSettings["NameOfBlobContainerYouWantToCopy"];

        private static readonly string _AMSAADTenantDomain =
            ConfigurationManager.AppSettings["AMSAADTenantDomain"];
        private static readonly string _AMSRESTAPIEndpoint =
            ConfigurationManager.AppSettings["AMSRESTAPIEndpoint"];
        private static readonly string _AMSClientId =
            ConfigurationManager.AppSettings["AMSClientId"];
        private static readonly string _AMSClientSecret =
            ConfigurationManager.AppSettings["AMSClientSecret"];
        private static readonly string _AMSStorageAccountName =
            ConfigurationManager.AppSettings["AMSStorageAccountName"];
        private static readonly string _AMSStorageAccountKey =
            ConfigurationManager.AppSettings["AMSStorageAccountKey"];

        // Field for service context.
        private static CloudMediaContext _context = null;
        private static CloudStorageAccount _sourceStorageAccount = null;
        private static CloudStorageAccount _destinationStorageAccount = null;

        static void Main(string[] args)
        {
            AzureAdTokenCredentials tokenCredentials = new AzureAdTokenCredentials(_AMSAADTenantDomain,
               new AzureAdClientSymmetricKey(_AMSClientId, _AMSClientSecret),
               AzureEnvironments.AzureChinaCloudEnvironment);
            
            var tokenProvider = new AzureAdTokenProvider(tokenCredentials);

            // Create the context for your source Media Services account.
            _context = new CloudMediaContext(new Uri(_AMSRESTAPIEndpoint), tokenProvider);

            _sourceStorageAccount =
                new CloudStorageAccount(new StorageCredentials(_sourceStorageAccountName,
                    _sourceStorageAccountKey), true);

            _destinationStorageAccount =
                new CloudStorageAccount(new StorageCredentials(_AMSStorageAccountName,
                    _AMSStorageAccountKey), true);

            CloudBlobClient sourceCloudBlobClient =
                _sourceStorageAccount.CreateCloudBlobClient();
            CloudBlobContainer sourceContainer =
                sourceCloudBlobClient.GetContainerReference(_NameOfBlobContainerYouWantToCopy);

            CreateAssetFromExistingBlobs(sourceContainer);

            Console.WriteLine("Done");
        }

        static private IAsset CreateAssetFromExistingBlobs(CloudBlobContainer sourceBlobContainer)
        {
            CloudBlobClient destBlobStorage = _destinationStorageAccount.CreateCloudBlobClient();

            // Create a new asset. 
            IAsset asset = _context.Assets.Create("NewAsset_" + Guid.NewGuid(), AssetCreationOptions.None);

            IAccessPolicy writePolicy = _context.AccessPolicies.Create("writePolicy",
                TimeSpan.FromHours(24), AccessPermissions.Write);

            ILocator destinationLocator =
                _context.Locators.CreateLocator(LocatorType.Sas, asset, writePolicy);

            // Get the asset container URI and Blob copy from mediaContainer to assetContainer. 
            CloudBlobContainer destAssetContainer =
                destBlobStorage.GetContainerReference((new Uri(destinationLocator.Path)).Segments[1]);

            if (destAssetContainer.CreateIfNotExists())
            {
                destAssetContainer.SetPermissions(new BlobContainerPermissions
                {
                    PublicAccess = BlobContainerPublicAccessType.Blob
                });
            }

            var blobList = sourceBlobContainer.ListBlobs();

            foreach (CloudBlockBlob sourceBlob in blobList)
            {
                var assetFile = asset.AssetFiles.Create((sourceBlob as ICloudBlob).Name);

                ICloudBlob destinationBlob = destAssetContainer.GetBlockBlobReference(assetFile.Name);

                CopyBlob(sourceBlob, destAssetContainer);
                
                sourceBlob.FetchAttributes();
                assetFile.ContentFileSize = (sourceBlob as ICloudBlob).Properties.Length;
                assetFile.Update();
                Console.WriteLine("File {0} is of {1} size", assetFile.Name, assetFile.ContentFileSize);
            }

            asset.Update();

            destinationLocator.Delete();
            writePolicy.Delete();

            // Set the primary asset file.
            // If, for example, we copied a set of Smooth Streaming files, 
            // set the .ism file to be the primary file. 
            // If we, for example, copied an .mp4, then the mp4 would be the primary file. 
            var ismAssetFile = asset.AssetFiles.ToList().
                Where(f => f.Name.EndsWith(".ism", StringComparison.OrdinalIgnoreCase)).FirstOrDefault();

            // The following code assigns the first .ism file as the primary file in the asset.
            // An asset should have one .ism file.  
            if (ismAssetFile != null)
            {
                ismAssetFile.IsPrimary = true;
                ismAssetFile.Update();
            }

            return asset;
        }

        /// <summary>
        /// Copies the specified blob into the specified container.
        /// </summary>
        /// <param name="sourceBlob">The source container.</param>
        /// <param name="destinationContainer">The destination container.</param>
        static private void CopyBlob(ICloudBlob sourceBlob, CloudBlobContainer destinationContainer)
        {
            var signature = sourceBlob.GetSharedAccessSignature(new SharedAccessBlobPolicy
            {
                Permissions = SharedAccessBlobPermissions.Read,
                SharedAccessExpiryTime = DateTime.UtcNow.AddHours(24)
            });

            var destinationBlob = destinationContainer.GetBlockBlobReference(sourceBlob.Name);

            if (destinationBlob.Exists())
            {
                Console.WriteLine(string.Format("Destination blob '{0}' already exists. Skipping.", destinationBlob.Uri));
            }
            else
            {

                // Display the size of the source blob.
                Console.WriteLine(sourceBlob.Properties.Length);

                Console.WriteLine(string.Format("Copy blob '{0}' to '{1}'", sourceBlob.Uri, destinationBlob.Uri));
                destinationBlob.StartCopy(new Uri(sourceBlob.Uri.AbsoluteUri + signature));

                while (true)
                {
                    // The StartCopyFromBlob is an async operation, 
                    // so we want to check if the copy operation is completed before proceeding. 
                    // To do that, we call FetchAttributes on the blob and check the CopyStatus. 
                    destinationBlob.FetchAttributes();
                    if (destinationBlob.CopyState.Status != CopyStatus.Pending)
                    {
                        break;
                    }
                    //It's still not completed. So wait for some time.
                    System.Threading.Thread.Sleep(1000);
                }

                // Display the size of the destination blob.
                Console.WriteLine(destinationBlob.Properties.Length);

            }
        }
    }
}

后续步骤Next steps

现在可以对上传的资产进行编码。You can now encode your uploaded assets. 有关详细信息，请参阅 对资产进行编码。For more information, see Encode assets.

媒体服务学习路径Media Services learning paths

媒体服务 v3（最新版本）Media Services v3 (latest)

查看最新版本的 Azure 媒体服务！Check out the latest version of Azure Media Services!

• 概述Overview
• 概念Concepts
• 开始开发Start developing
• 从 v2 到 v3 的迁移指南Migration guidance from v2 to v3

媒体服务 v2（旧版）Media Services v2 (legacy)

• 概述Overview
• 创建帐户Create account
• 按需交付Deliver on-demand
• 实时交付Deliver live