Audio 音频(.aa)文件规格?
有人知道音频(.aa)文件规范中有好的资源吗Audio 音频(.aa)文件规格?,audio,Audio,有人知道音频(.aa)文件规范中有好的资源吗 我正在尝试编写一个可以使用它们的程序,如果没有人知道某个资源,我自己有没有关于反向工程规范的技巧?我在一个十六进制编辑器中打开它,四处翻找,看起来像一个MP3,但标题信息更多。我想,没有规范。请看: 引述: [...] Audible introduced one of the first digital audio players in 1997. The following year it published a Web site from wh
我正在尝试编写一个可以使用它们的程序,如果没有人知道某个资源,我自己有没有关于反向工程规范的技巧?我在一个十六进制编辑器中打开它,四处翻找,看起来像一个MP3,但标题信息更多。我想,没有规范。请看: 引述:
[...]
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.
[...]
小结:专有/专利我对音频报头做了一些研究,为我的车载收音机/电脑创建了一个播放器。基本上,文件开头有一个3700个字符的块,包含许多感兴趣的字段,如标题、作者、叙述者等。我用C#编写了一些有限的解析代码来显示.aa文件中的一些基本信息。详情如下:
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 + ")";
}
这个网站提供了一些关于某些数据块在.aa文件中的位置的更多信息 goldwave(www.goldwave.com)可以阅读,但我认为他们被告知停止阅读,DRM