8.15.读取mp3文件的ID3数据
8.15.1. 问题
我需要从一个MP3 文件中读取ID3 数据。
8.15.2. 解决办法
使用Event.ID3 方法，当ID3 数据被分析时Sound 类将被迅速处理
8.15.3. 讨论
当把一个装载的MP3 文件的ID3 数据被分析时，Sound 类迅速处理一个事件。这些数据被作为一个ID3Info 对象保存，它定义的变量访问的所有属性被写入MP3 开头的字节中：
一首我听的歌中的信息，我写的这方似乎是这样的：
TCON = Alternative & Punk
TIT2 = The Pink Batman
TRCK = 2/9
TPE1 = Dan Deacon
TALB = Spiderman Of The Rings
TCOM = Dan Deacon
MP3 文件的ID3 信息是一个简单的按一定次序分组的字节，读取和返回字符串或整数。MP3是Flash Player 支持的唯一一种格式。RichApps (www.richapps.de)的开发者Benjamin Dobler，不管怎么样，已经为WAV 格式作了一些优秀的工作。得到WAV 文件在Flash Player中播放稍微困难一些。如果你有兴趣，可以到Benjamin 的网站去看看。如果你需要从WAV文件中分析数据，看起来像这样：
如果你需要从AU 文件读取头信息，那看起来像这样：
MP3 可能是读取数据最简单的格式，但是他们无疑不是我们能读取得唯一格式。
我需要从一个MP3 文件中读取ID3 数据。
8.15.2. 解决办法
使用Event.ID3 方法，当ID3 数据被分析时Sound 类将被迅速处理
8.15.3. 讨论
当把一个装载的MP3 文件的ID3 数据被分析时，Sound 类迅速处理一个事件。这些数据被作为一个ID3Info 对象保存，它定义的变量访问的所有属性被写入MP3 开头的字节中：
+展开
-ActionScript
private var sound:Sound;
public function _8_16()
{
sound = new Sound();
sound.addEventListener(Event.ID3, onID3InfoReceived);
sound.load(new URLRequest("../assets/1.mp3"));
}
private function onID3InfoReceived(event:Event):void
{
var id3:ID3Info = event.target.id3;
for (var propName:String in id3)
{
trace(propName + " = " + id3[propName]);
}
}
public function _8_16()
{
sound = new Sound();
sound.addEventListener(Event.ID3, onID3InfoReceived);
sound.load(new URLRequest("../assets/1.mp3"));
}
private function onID3InfoReceived(event:Event):void
{
var id3:ID3Info = event.target.id3;
for (var propName:String in id3)
{
trace(propName + " = " + id3[propName]);
}
}
一首我听的歌中的信息，我写的这方似乎是这样的：
TCON = Alternative & Punk
TIT2 = The Pink Batman
TRCK = 2/9
TPE1 = Dan Deacon
TALB = Spiderman Of The Rings
TCOM = Dan Deacon
MP3 文件的ID3 信息是一个简单的按一定次序分组的字节，读取和返回字符串或整数。MP3是Flash Player 支持的唯一一种格式。RichApps (www.richapps.de)的开发者Benjamin Dobler，不管怎么样，已经为WAV 格式作了一些优秀的工作。得到WAV 文件在Flash Player中播放稍微困难一些。如果你有兴趣，可以到Benjamin 的网站去看看。如果你需要从WAV文件中分析数据，看起来像这样：
+展开
-ActionScript
public var bytes:ByteArray;
public var chunkId:String;
public var chunkSize:int;
public var chunkFormat:String;
public var subchunk1Id:String;
public var subchunk1Size;
public var audioFormat;
public var channels;
public var sampleRate;
public var bytesPersecond;
public var blockAlign;
public var bitsPerSample;
public var dataChunkSignature:String;
public var dataChunkLength;
public function read(bytes:ByteArray):void{
this.bytes = bytes;
// Read Header
bytes.endian = "littleEndian";
chunkId = bytes.readMultiByte(4,"utf"); //RIFF
chunkSize = bytes.readUnsignedInt();
chunkFormat = bytes.readMultiByte(4,"utf"); //WAVE
subchunk1Id = bytes.readMultiByte(4,"iso-8859-1"); // 12Header Signature
subchunk1Size = bytes.readInt(); // 16 4 <fmt length>
audioFormat = bytes.readShort(); // 20 2 <format tag> sample
channels = bytes.readShort(); // 22 2 <channels> 1 = mono,2 = stereo
sampleRate = bytes.readUnsignedInt();// 24 4 <sample rate>
bytesPersecond = bytes.readUnsignedInt(); //28 4<bytes/second> Sample-Rate * Block-Align
blockAlign = bytes.readShort(); // 32 2 <block align> channel * bits/sample / 8
bitsPerSample = bytes.readUnsignedShort(); //34 2<bits/sample> 8, 16 or 24
dataChunkSignature = bytes.readMultiByte(4,"iso-8859-1");
//RIFF
dataChunkLength = bytes.readInt();
}
public var chunkId:String;
public var chunkSize:int;
public var chunkFormat:String;
public var subchunk1Id:String;
public var subchunk1Size;
public var audioFormat;
public var channels;
public var sampleRate;
public var bytesPersecond;
public var blockAlign;
public var bitsPerSample;
public var dataChunkSignature:String;
public var dataChunkLength;
public function read(bytes:ByteArray):void{
this.bytes = bytes;
// Read Header
bytes.endian = "littleEndian";
chunkId = bytes.readMultiByte(4,"utf"); //RIFF
chunkSize = bytes.readUnsignedInt();
chunkFormat = bytes.readMultiByte(4,"utf"); //WAVE
subchunk1Id = bytes.readMultiByte(4,"iso-8859-1"); // 12Header Signature
subchunk1Size = bytes.readInt(); // 16 4 <fmt length>
audioFormat = bytes.readShort(); // 20 2 <format tag> sample
channels = bytes.readShort(); // 22 2 <channels> 1 = mono,2 = stereo
sampleRate = bytes.readUnsignedInt();// 24 4 <sample rate>
bytesPersecond = bytes.readUnsignedInt(); //28 4<bytes/second> Sample-Rate * Block-Align
blockAlign = bytes.readShort(); // 32 2 <block align> channel * bits/sample / 8
bitsPerSample = bytes.readUnsignedShort(); //34 2<bits/sample> 8, 16 or 24
dataChunkSignature = bytes.readMultiByte(4,"iso-8859-1");
//RIFF
dataChunkLength = bytes.readInt();
}
如果你需要从AU 文件读取头信息，那看起来像这样：
+展开
-ActionScript
public var bytes:ByteArray;
public var magicId;
public var header;
public var datasize;
public var channels;
public var comment;
public var sampleRate;
public var encodingInfo;
public function read(bytes:ByteArray):void{
this.bytes = bytes;
// Read Header
bytes.endian = "bigEndian";
magicId = bytes.readUnsignedInt();
header = bytes.readInt();
datasize = bytes.readUnsignedInt();
encodingInfo = bytes.readUnsignedInt();
sampleRate = bytes.readUnsignedInt();
channels = bytes.readInt();
comment = bytes.readMultiByte(uint(header)-24, "utf");
}
public var magicId;
public var header;
public var datasize;
public var channels;
public var comment;
public var sampleRate;
public var encodingInfo;
public function read(bytes:ByteArray):void{
this.bytes = bytes;
// Read Header
bytes.endian = "bigEndian";
magicId = bytes.readUnsignedInt();
header = bytes.readInt();
datasize = bytes.readUnsignedInt();
encodingInfo = bytes.readUnsignedInt();
sampleRate = bytes.readUnsignedInt();
channels = bytes.readInt();
comment = bytes.readMultiByte(uint(header)-24, "utf");
}
MP3 可能是读取数据最简单的格式，但是他们无疑不是我们能读取得唯一格式。
加支付宝好友偷能量挖...
