public static void StripPadding(string WaveFile, int Seconds)
{
var reader = new WaveFileReader(WaveFile);
var strTarget = new BinaryWriter(new MemoryStream());
WaveFormat fmt = reader.WaveFormat;
string temp1name = Path.GetDirectoryName(WaveFile) + Path.DirectorySeparatorChar +
Path.GetFileNameWithoutExtension(WaveFile) + "-temp." + Path.GetExtension(WaveFile);
string temp2name = Path.GetDirectoryName(WaveFile) + Path.DirectorySeparatorChar +
Path.GetFileNameWithoutExtension(WaveFile) + "-old." + Path.GetExtension(WaveFile);
int samples = fmt.SampleRate * Seconds;
int sampleSize = (fmt.BitsPerSample / 8) * fmt.Channels;
int padBytes = samples * sampleSize;
var bufsize = (int)(reader.Length - (padBytes * 2));
var buf = new byte[bufsize];
int newSampleCount = bufsize / sampleSize;
reader.Seek(padBytes, SeekOrigin.Begin);
strTarget.Write(reader.Read(buf, 0, buf.Length));
reader.Close();
reader.Dispose();
var file = new RiffFile(WaveFile, false);
file.GetChunk<CkData>().Data = buf;
// adjust marker positions, remove if outside
foreach (Chunk ch in file.Chunks)
{
if (ch.GetType() == typeof(CkCue))
{
var me = ch as CkCue;
//foreach (CuePoint cp in me.CuePoints)
if (me != null)
for (int i = me.CuePoints.Count - 1; i >= 0; i--)
{
CuePoint cp = me.CuePoints[i];
cp.Position -= (uint)samples;
cp.SampleOffset -= (uint)samples;
if (cp.Position > newSampleCount)
me.CuePoints.Remove(cp);
}
}
// trim down region lengths (ugly, but necessary due to Vegas rounding rather than truncating)
else if (ch is CkList)
{
var me = ch as CkList;
foreach (ListChunk lch in me.Chunks)
{
if (lch.GetType() == typeof(LiCkLtxt))
{
var lt = lch as LiCkLtxt;
if (lt != null && lt.SampleLength > newSampleCount)
{
lt.SampleLength = (uint)newSampleCount;
}
}
else if (lch.GetType() == typeof(LiCkInfoTCOD))
{
var tch = lch as LiCkInfoTCOD;
if (tch != null) tch.Position += (uint)samples;
}
else if (lch.GetType() == typeof(LiCkInfoTCDO))
{
var tch = lch as LiCkInfoTCDO;
if (tch != null) tch.Position -= (uint)samples;
}
}
}
}
file.Save(temp1name);
File.Move(WaveFile, temp2name);
File.Move(temp1name, WaveFile);
File.Delete(temp2name);
}
