JAVA 读取 ASF（WMA 和 WMV）文件信息
只提供对基本属性的读取（请参阅 MP3 的 ID3v1）。
/* 读取ASF（WMA、WMV）标签 */
public static MusicTagEntity ReadASFTag(String path)
{
try
{
char[] WMAHead = { 0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }; // WMA头部标识
char[] StandardHead = { 0x33, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }; // 标准TAG头部标识
char[] ExtendHead = { 0x40, 0xA4, 0xD0, 0xD2, 0x07, 0xE3, 0xD2, 0x11, 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50 }; // 扩展TAG头部标识
String[] StandardHeadString = { "33", "26", "B2", "75", "8E", "66", "CF", "11", "A6", "D9", "00", "AA", "00", "62", "CE", "6C" }; // 标准TAG头部标识
String[] ExtendHeadString = { "40", "A4", "D0", "D2", "07", "E3", "D2", "11", "97", "F0", "00", "A0", "C9", "5E", "A8", "50" }; // 扩展TAG头部标识
MusicTagEntity mt = new MusicTagEntity();
File f = new File(path);
InputStream is = new BufferedInputStream(new FileInputStream(f));
BufferedReader br = new BufferedReader(new InputStreamReader(is, "ISO-8859-1")); // 头部需要用ASCII编码
// 读取头部判断是否为WMA文件
char[] buf = new char[16];
br.read(buf);
if (Arrays.equals(buf, WMAHead))
{// 是WMA
br.read(buf = new char[14]); // 跳过无用的8+6字节
br.read(buf = new char[16]); // 确定标签类型的头
// 需要判断这里是先扩展再标准还是先标准再扩展
if (Arrays.equals(buf, ExtendHead))
{// 扩展
br.read(buf = new char[8]); // 再次放过8字节（此处无用的8字节标志位）
br.read(buf = new char[2]); // 扩展标签的总个数
int ExtendCount = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
for (int i = 0; i < ExtendCount; i++)
{
br.read(buf = new char[2]); // 扩展名称长度
int FiledNameLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[FiledNameLength]); // 读取扩展名称
String strFieldName = Common.UnicodeCharToString(buf);
br.read(buf = new char[2]); // Flag，暂时不用
br.read(buf = new char[2]); // 扩展字段长度
int FiledLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[FiledLength]); // 读取扩展字段
if (strFieldName.equals("WM/TrackNumber"))
mt.setTrack(Common.UnicodeCharToString(buf));
if (strFieldName.equals("WM/Track"))
mt.setTrack(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/AlbumArtist"))
mt.setArtist(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/AlbumTitle"))
mt.setAlbum(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/Year"))
mt.setYear(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/Genre"))
mt.setGener(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/WM/GenreID"))
mt.setGener(Common.UnicodeCharToString(buf));
}
// 开始读取标准头
do
{// 跳过空白字符
br.read(buf = new char[1]);
}
while ((int) buf[0] == 0);
boolean IsStandartHeader = true; // 是否包含标准头部信息
if (Integer.toHexString((int) buf[0]).equals(StandardHeadString[0]))
{
for (int i = 1; i <= 15; i++)
{
br.read(buf = new char[1]);
String strHex = Integer.toHexString((int) buf[0]).toUpperCase();
if (strHex.length() == 1)
strHex = "0" + strHex;
if (!strHex.equals(StandardHeadString[i]))
{
IsStandartHeader = false;
break;
}
}
if (IsStandartHeader)
{// 找到标准头
br.read(buf = new char[8]); // 8字节无效内容
br.read(buf = new char[2]); // 标题长度
int TitleLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 艺术家长度
int ArtistLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 版权长度
int CopyrightLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 备注长度
int CommentLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 2字节无效内容
// 读取标题
br.read(buf = new char[TitleLength]);
mt.setTitle(Common.UnicodeCharToString(buf));
// 读取艺术家
br.read(buf = new char[ArtistLength]);
if (mt.getArtist().equals("")) // 如果扩展属性中没有此信息，则采用
mt.setArtist(Common.UnicodeCharToString(buf));
br.read(buf = new char[CopyrightLength]); // 跳过版权说明
// 读取备注
br.read(buf = new char[CommentLength]);
mt.setComment(Common.UnicodeCharToString(buf));
}
}
}
else if (Arrays.equals(buf, StandardHead))
{// 标准
br.read(buf = new char[8]); // 8字节无效内容
br.read(buf = new char[2]); // 标题长度
int TitleLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 艺术家长度
int ArtistLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 版权长度
int CopyrightLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 备注长度
int CommentLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[2]); // 2字节无效内容
// 读取标题
br.read(buf = new char[TitleLength]);
mt.setTitle(Common.UnicodeCharToString(buf));
// 读取艺术家
br.read(buf = new char[ArtistLength]);
mt.setArtist(Common.UnicodeCharToString(buf));
br.read(buf = new char[CopyrightLength]); // 跳过版权说明
// 读取备注
br.read(buf = new char[CommentLength]);
mt.setComment(Common.UnicodeCharToString(buf));
// 开始读取扩展头
do
{// 跳过空白字符
br.read(buf = new char[1]);
}
while ((int) buf[0] == 0);
boolean IsExtendHeader = true; // 是否包含标准头部信息
if (Integer.toHexString((int) buf[0]).equals(ExtendHeadString[0]))
{
for (int i = 1; i <= 15; i++)
{
br.read(buf = new char[1]);
String strHex = Integer.toHexString((int) buf[0]).toUpperCase();
if (strHex.length() == 1)
strHex = "0" + strHex;
if (!strHex.equals(ExtendHeadString[i]))
{
IsExtendHeader = false;
break;
}
}
if (IsExtendHeader)
{// 找到扩展头
br.read(buf = new char[8]); // 再次放过8字节（此处无用的8字节标志位）
br.read(buf = new char[2]); // 扩展标签的总个数
int ExtendCount = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
for (int i = 0; i < ExtendCount; i++)
{
br.read(buf = new char[2]); // 扩展名称长度
int FiledNameLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[FiledNameLength]); // 读取扩展名称
String strFieldName = Common.UnicodeCharToString(buf);
br.read(buf = new char[2]); // Flag，暂时不用
br.read(buf = new char[2]); // 扩展字段长度
int FiledLength = Integer.valueOf(Common.DecodeUnicodeHex(buf), 16); // 转换成数值
br.read(buf = new char[FiledLength]); // 读取扩展字段
if (strFieldName.equals("WM/TrackNumber"))
mt.setTrack(Common.UnicodeCharToString(buf));
if (strFieldName.equals("WM/Track"))
mt.setTrack(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/AlbumArtist"))
mt.setArtist(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/AlbumTitle"))
mt.setAlbum(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/Year"))
mt.setYear(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/Genre"))
mt.setGener(Common.UnicodeCharToString(buf));
else if (strFieldName.equals("WM/WM/GenreID"))
mt.setGener(Common.UnicodeCharToString(buf));
}
}
}
}
br.close();
is.close();
return mt;
}
else
{// 不是ASF格式
br.close();
is.close();
return null;
}
}
catch (Exception e)
{
e.printStackTrace();
return null;
}
}
相关的字符编码转换方法：
/* 十六进制UnicodeChar转String */
public static String UnicodeCharToString(char[] Char)
{
String strTemp = "";
for (int i = 1; i < Char.length; i += 2)
{
String s1 = Integer.toHexString((int) Char[i]);
String s2 = Integer.toHexString((int) Char[i - 1]);
// 长度不足补全
if (s1.length() == 1)
s1 = "0" + s1;
if (s2.length() == 1)
s2 = "0" + s2;
strTemp += s1 + s2;
}
return UnicodeToString(strTemp).trim();
}
/* 将十六进制Unicode字符串转为汉字（将双字节转为单个字符） */
public static String UnicodeToString(String Hex)
{
String enUnicode = null;
String deUnicode = null;
for (int i = 0; i < Hex.length(); i++)
{
if (enUnicode == null)
enUnicode = String.valueOf(Hex.charAt(i));
else
enUnicode = enUnicode + Hex.charAt(i);
if (i % 4 == 3)
{
if (enUnicode != null)
{
if (deUnicode == null)
deUnicode = String.valueOf((char) Integer.valueOf(enUnicode, 16).intValue());
else
deUnicode = deUnicode + String.valueOf((char) Integer.valueOf(enUnicode, 16).intValue());
}
enUnicode = null;
}
}
return deUnicode;
}
/* 倒序排列十六进制Unicode（用以计算该字节标识的数值） */
public static String DecodeUnicodeHex(char[] Char)
{
String strTemp = "";
boolean CouldContinue = true;
for (int i = Char.length - 1; i >= 0; i--)
{
String strHex = Integer.toHexString((int) Char[i]);
if (strHex.length() == 1)
strHex = "0" + strHex;
if (strHex.equals("00") && CouldContinue)
continue;
else
{
strTemp += strHex;
CouldContinue = false;
}
}
return strTemp;
}
此外还需要一个用于接收信息的类（MusicTagEntity.java）：
package *; //请自行填写
public class MusicTagEntity
{
private String Album = ""; // 专辑名称
private String Title = ""; // 歌曲标题
private String Gener = ""; // 流派
private String Artist = ""; // 艺术家
private String Year = ""; // 年份
private String Track = ""; // 音轨号
private String Lyric = ""; // 歌词
private String Comment = ""; // 备注
public String getAlbum()
{
return Album;
}
public void setAlbum(String album)
{
Album = album;
}
public String getTitle()
{
return Title;
}
public void setTitle(String title)
{
Title = title;
}
public String getGener()
{
return Gener;
}
public void setGener(String gener)
{
Gener = gener;
}
public String getArtist()
{
return Artist;
}
public void setArtist(String artist)
{
Artist = artist;
}
public String getYear()
{
return Year;
}
public void setYear(String year)
{
Year = year;
}
public String getTrack()
{
return Track;
}
public void setTrack(String track)
{
Track = track;
}
public String getLyric()
{
return Lyric;
}
public void setLyric(String lyric)
{
Lyric = lyric;
}
public String getComment()
{
return Comment;
}
public void setComment(String comment)
{
Comment = comment;
}
}