Audible Audio（.aa）文件規格？

Question

有沒有人知道Audible Audio（.aa）文件規範有很好的資源？

我想寫一個程序，可以使用它們，如果沒有人知道的資源，任何提示反向工程規範我自己？我用一個十六進制編輯器打開它，四處張望，看起來像MP3，但有更多的標題信息。

Answer 1

我做了一些研究，在聲音標題爲我的汽車收音機/計算機創建一個播放器。基本上，在文件開始處有一個3700個字符的塊，它包含許多感興趣的字段，例如Title，Author，Narrator等。我在C＃中使用了一些有限的解析代碼來顯示一些基本信息.aa文件。如下所示：

private void ParseFields(string fileName) 
    { 
     string aaHeader; 
     string tryDate; 
     if (fileName == "") return; 

     using (StreamReader sr = new StreamReader(fileName)) 
     { 
      char[] buff = new char[3700]; 
      sr.Read(buff, 0, buff.Length); 
      aaHeader = new string(buff); 
     } 
     try 
     { 
      _author = GetParsedItem(aaHeader, "author"); 
     } 
     catch 
     { 
      _author = "?"; 
     } 
     try 
     { 
      _title = GetParsedItem(aaHeader, "short_title"); 
     } 
     catch 
     { 
      _title = "???"; 
     } 
     try 
     { 
      _narrator = GetParsedItem(aaHeader, "narrator"); 
     } 
     catch 
     { 
      _narrator = "?"; 
     } 
     try 
     { 
      _description = GetParsedItem(aaHeader, "description"); 
     } 
     catch 
     { 
      _description = "???"; 
     } 
     try 
     { 
      _longDescription = GetParsedItem(aaHeader, "long_description"); 
     } 
     catch 
     { 
      _longDescription = ""; 
     } 
     try 
     { 
      tryDate = GetParsedItem(aaHeader, "pubdate"); 
      if (tryDate != "") 
       _pubDate = Convert.ToDateTime(GetParsedItem(aaHeader, "pubdate")); 
      else 
       _pubDate = DateTime.Today; 
     } 
     catch 
     { 
      _pubDate = DateTime.Today; 
     } 
    } 
    private string GetParsedItem(string buffer, string fieldName) 
    { 
     if (buffer.Contains(fieldName)) 
     { 
      int pos = buffer.IndexOf(fieldName); 
      pos += fieldName.Length; 
      int posEnd = buffer.IndexOf('\0',pos); 
      //if the value for the field is empty, skip it and look for another 
      if (pos == posEnd) 
      { 
       pos = buffer.IndexOf(fieldName, posEnd); 
       pos += fieldName.Length; 
       posEnd = buffer.IndexOf('\0', pos); 
      } 
      return buffer.Substring(pos, posEnd - pos); 
     } 
     else 
      return "(not found - " + fieldName + ")"; 
    } 

Answer 2

我認爲，沒有規範。看看Wikipedia/Audible.com：

報價：

[...] 
Audible introduced one of the first digital audio players in 1997. 
The following year it published a Web site from which audio files in its 
proprietary .aa format could be downloaded. Audible holds a number of patents 
in this area. 
[...] 

摘要：專有/專利

Answer 3

本網站提供了一些關於某些數據塊位於.aa文件中的更多信息。

http://wiki.multimedia.cx/index.php?title=Audible_Audio