private byte[] extractSongData(Song song, BinaryReader br, out List<Int32> dpdsTable)
{
var buf = new byte[ChunkBufferSize];
var data = new List<byte>();
dpdsTable = new List<Int32>();
var curDecLen = 0;
br.BaseStream.Position = song.Offset;
for (var i = song.FirstChunkID; i <= song.LastChunkID; i++)
{
br.BaseStream.Position += 56;
var packetDecLen = 0;
for (var j = 0; j < _curChunkPacketCounts[i]; j++)
{
packetDecLen = curDecLen + br.ReadInt32();
dpdsTable.Add(packetDecLen);
}
curDecLen = packetDecLen;
var chunkLen = getChunkLength(i);
br.Read(buf, 0, (int) chunkLen);
data.AddRange(buf.Take((int) chunkLen));
}
return data.ToArray();
}
private void exportSongToXwma(Song song, BinaryReader br, string xmaFn)
{
var dpdsTable = new List<Int32>();
var data = extractSongData(song, br, out dpdsTable);
File.Copy(_curChannels == 2 ? "audio.xma" : "audiom.xma", xmaFn, true);
long packetCount, dpdsPos, dataPos;
using (var tempBr = new MemoryStream(File.ReadAllBytes(xmaFn)))
{
dpdsPos = findArrayInStream(tempBr, XwmaDpdsHeader, 0) + 8;
dataPos = findArrayInStream(tempBr, XwmaDataHeader, dpdsPos);
packetCount = (dataPos - dpdsPos) / 4;
}
using (var bw = new BinaryWriter(File.OpenWrite(xmaFn)))
{
bw.BaseStream.Position = dpdsPos;
for (var i = 0; i < packetCount; i++)
{
if (i < dpdsTable.Count)
{
bw.Write(dpdsTable[i]);
}
else
{
bw.Write(dpdsTable.Last());
}
}
bw.BaseStream.Position = dataPos + 8;
bw.Write(data);
bw.Flush();
}
}
private void parseSongs()
{
var songs = new List<Song>();
for (var i = 0; i < _curSongOffsets.Count; i++)
{
var song = new Song();
song.FirstChunkID = _curChunkOffsets.IndexOf(_curSongOffsets[i]);
song.Offset = _curSongOffsets[i];
if (i < _curSongOffsets.Count - 1)
{
song.LastChunkID = _curChunkOffsets.IndexOf(_curSongOffsets[i + 1]) - 1;
song.ChunkCount = song.LastChunkID - song.FirstChunkID + 1;
}
else
{
song.LastChunkID = _curChunkOffsets.Count - 1;
song.ChunkCount = song.LastChunkID - song.FirstChunkID + 1;
}
song.Length = 0;
song.PacketCount = 0;
for (var j = song.FirstChunkID; j <= song.LastChunkID; j++)
{
song.Length += getChunkLength(j);
song.PacketCount += _curChunkPacketCounts[j];
}
song.ID = i;
song.Duration = (double) song.Length / 4000;
songs.Add(song);
}
_allSongs = new List<Song>(songs);
_matchingSongs = new ObservableCollection<Song>(_allSongs);
}
private string exportSongToWav(Song song, BinaryReader br, string wavFn)
{
var xmaFn = Path.GetDirectoryName(wavFn) + "\\" + Path.GetFileNameWithoutExtension(wavFn) + ".xma";
exportSongToXwma(song, br, xmaFn);
var command = Directory.GetCurrentDirectory() + "\\xWMAEncode.exe";
var args = "\"" + xmaFn + "\" \"" + wavFn + "\"";
var px = Process.Start(new ProcessStartInfo(command, args) { WindowStyle = ProcessWindowStyle.Hidden });
px.WaitForExit();
File.Delete(xmaFn);
return wavFn;
}