[UWP]我们如何将部分解密的视频播放到媒体元素中。 [英] [UWP]How can we play partially decrypted video into media element.
问题描述
我正在下载一个大的3GB文件并加密成块并保存到app local。然后在播放解密同一个文件到块时，只有完成解密文件后才能播放。
I am downloading a large 3GB file and encrypting into chunks and save into app local. Then when playing decrypting same file into chunks and after completing decrypted file only I am able to play.
如果我解密第一个块并给玩家播放和下一次解密，是否可能因为它然后给下一个块部分播放等等..
动机是当我开始解密媒体元素开始播放视频时不要等到完全解密。
Is it possible if I decrypted first chunks and give to player for playing and next decryption going on as it is then give next chunks part for playing and so on.. Motive is when I start decrypting media element start going to play video don't wait till decrypting completely.
我的代码是 -
    private void Encrypt（流输入，流输出，字符串密码，字符串盐）
      {
          output.Position = 0;
          byte [] buffer = new byte [1024 * 1024];
          int bytesRead;
          while（（bytesRead = input.Read（buffer，0，buffer.Length））> 0）
          {
              var tmp = AES_Encrypt（缓冲区，密码，盐）;
              output.Write（tmp，0，tmp.Length）;
          }¥b $ b       }
      public byte [] AES_Encrypt（byte [] bytesToBeEncrypted，String pass，String salt）
      {
          byte [] encryptedBytes = null;
          byte [] passByte = Encoding.ASCII.GetBytes（pass）;
          byte [] saltBytes = Encoding.ASCII.GetBytes（salt）;
          Aes aesEn = Aes.Create（）;
          aesEn.Padding = PaddingMode.None;
          aesEn.Mode = CipherMode.CBC;
          ICryptoTransform encryptor = aesEn.CreateEncryptor（passByte，saltBytes）;
         使用（MemoryStream ms = new MemoryStream（））
          {
              using（var cs = new CryptoStream（ms，encryptor，CryptoStreamMode.Write））
              {
                  cs.Write（bytesToBeEncrypted，0，bytesToBeEncrypted.Length）;
              }¥b $ b               encryptedBytes = ms.ToArray（）;
          }¥b $ b           return encryptedBytes;
      }
      private async Task Decrypt（流输入，流输出，字符串密码，字符串盐）
      {
          input.Position = 0;
          byte [] buffer = new byte [1024 * 1024];
          int bytesRead;
          while（（bytesRead = await input.ReadAsync（buffer，0，buffer.Length））> 0）
          {
              var tmp = AES_Decrypt（缓冲区，密码，盐）;
private void Encrypt(Stream input, Stream output, String password, String salt)
{
output.Position = 0;
byte[] buffer = new byte[1024 * 1024];
int bytesRead;
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0)
{
var tmp = AES_Encrypt(buffer, password, salt);
output.Write(tmp, 0, tmp.Length);
}
}
public byte[] AES_Encrypt(byte[] bytesToBeEncrypted, String pass, String salt)
{
byte[] encryptedBytes = null;
byte[] passByte = Encoding.ASCII.GetBytes(pass);
byte[] saltBytes = Encoding.ASCII.GetBytes(salt);
Aes aesEn = Aes.Create();
aesEn.Padding = PaddingMode.None;
aesEn.Mode = CipherMode.CBC;
ICryptoTransform encryptor = aesEn.CreateEncryptor(passByte, saltBytes);
using (MemoryStream ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
}
encryptedBytes = ms.ToArray();
}
return encryptedBytes;
}
private async Task Decrypt(Stream input, Stream output, String password, String salt)
{
input.Position = 0;
byte[] buffer = new byte[1024 * 1024];
int bytesRead;
while ((bytesRead = await input.ReadAsync(buffer, 0, buffer.Length)) > 0)
{
var tmp = AES_Decrypt(buffer, password, salt);
              await output.WriteAsync（tmp，0，tmp.Length）;
await output.WriteAsync(tmp, 0, tmp.Length);
            //我想在这里给玩家节省时间。
// I want to give to player here for saving time.
          }
          Uri pathUri = new Uri（" ms-appx：/// Content / de5146"）;
          media.Source = MediaSource.CreateFromUri（pathUri）;
      }
      public byte [] AES_Decrypt（byte [] bytesToBeDecrypted，String pass，String salt）
      {
          byte [] decryptedBytes = null;
          byte [] passByte = Encoding.ASCII.GetBytes（pass）;
          byte [] saltBytes = Encoding.ASCII.GetBytes（salt）;
          Aes aesEn = Aes.Create（）;
          aesEn.Padding = PaddingMode.None;
          aesEn.Mode = CipherMode.CBC;
          ICryptoTransform decryptor = aesEn.CreateDecryptor（passByte，saltBytes）;
         使用（MemoryStream ms = new MemoryStream（））
          {
              using（var cs = new CryptoStream（ms，decryptor，CryptoStreamMode.Write））
              {
                  cs.Write（bytesToBeDecrypted，0，bytesToBeDecrypted.Length）;
              }¥b $ b               decryptedBytes = ms.ToArray（）;
              ms.Flush（）;
          }¥b $ b           return decryptedBytes;
      }
Uri pathUri = new Uri("ms-appx:///Content/de5146");
media.Source = MediaSource.CreateFromUri(pathUri);
}
public byte[] AES_Decrypt(byte[] bytesToBeDecrypted, String pass, String salt)
{
byte[] decryptedBytes = null;
byte[] passByte = Encoding.ASCII.GetBytes(pass);
byte[] saltBytes = Encoding.ASCII.GetBytes(salt);
Aes aesEn = Aes.Create();
aesEn.Padding = PaddingMode.None;
aesEn.Mode = CipherMode.CBC;
ICryptoTransform decryptor = aesEn.CreateDecryptor(passByte, saltBytes);
using (MemoryStream ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write))
{
cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
}
decryptedBytes = ms.ToArray();
ms.Flush();
}
return decryptedBytes;
}
sandeep chauhan
sandeep chauhan
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我是读取超过1 GB或2 GB的大型视频文件，在下面的代码中读取第二行时，我的内存不足。
I am reading large video file more than 1 GB or 2 GB, I am getting Out of memory exception when reading in 2nd line in below code.
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