WMA檔案的檔案頭結構

結構圖：

寫入extcontent資訊示例（讀取類似）：

//no extcontent block we need add it

nnewheaderobjects++;

int extcontentpos = 16 + 8 + 4 + 2; // 設定extcontent開始的位置

byte blastdata = new byte[fs.length - extcontentpos];

fs.seek(extcontentpos, seekorigin.begin);

fs.read(blastdata, 0, blastdata.length);

//write new header object count

fs.seek(24, seekorigin.begin);

byte bheaderobjects = bitconverter.getbytes(nnewheaderobjects);

fs.write(bheaderobjects, 0, bheaderobjects.length);

bheaderobjects = null;

int naddlength = 0;

//we need add 'wm/albumtitle/0' tag

int16 newcontents = 1;

byte bcontents = bitconverter.getbytes(newcontents);

naddlength += 2;

string tagstring = "wm/albumtitle/0";

byte btagstring = encoding.unicode.getbytes(tagstring);

int16 ntaglen = (int16)btagstring.length;

naddlength += 2;

naddlength += (int16)btagstring.length;

int16 nflag = 0;

byte bflag = bitconverter.getbytes(nflag);

naddlength += 2;

byte bvaluestring = encoding.unicode.getbytes(minfo.albumename + "/0");

int16 nvaluelen = (int16)bvaluestring.length;

naddlength += 2;

naddlength += bvaluestring.length;

int64 blocklen = naddlength + 24;

newmaxsize += blocklen;

//fs.seek(newmaxsize, seekorigin.begin);

fs.seek(extcontentpos, seekorigin.begin);

writeguid(fs, guidextcontentst);

//write new extcontents block size

byte bnewlen = bitconverter.getbytes(blocklen);

fs.write(bnewlen, 0, bnewlen.length);

bnewlen = null;

//write content num

fs.write(bcontents, 0, bcontents.length);

bcontents = null;

//write name len & name string

bnewlen = bitconverter.getbytes(ntaglen);

fs.write(bnewlen, 0, bnewlen.length);

bnewlen = null;

fs.write(btagstring, 0, btagstring.length);

btagstring = null;

//write 2 byts flag

fs.write(bflag, 0, bflag.length);

bflag = null;

//write value len & value strint

bnewlen = bitconverter.getbytes(nvaluelen);

fs.write(bnewlen, 0, bnewlen.length);

bnewlen = null;

fs.write(bvaluestring, 0, bvaluestring.length);

bvaluestring = null;

//write last data

fs.write(blastdata, 0, blastdata.length);

blastdata = null;

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