private void CreateTableOfContents()
{
try
{
// Just a guess at how many entries we'll need so the internal array need not resize very much
// 400 bytes per frame is probably a good enough approximation.
TableOfContents = new List <Mp3Index>();
Mp3Frame frame = null;
do
{
var index = new Mp3Index();
index.FilePosition = Mp3Stream.Position;
index.SamplePosition = totalSamples;
frame = ReadNextFrame(false);
if (frame != null)
{
ValidateFrameFormat(frame);
totalSamples += frame.SampleCount;
index.SampleCount = frame.SampleCount;
index.ByteCount = (int)(Mp3Stream.Position - index.FilePosition);
tableCreatPosition = index.FilePosition + index.ByteCount;
TableOfContents.Add(index);
}
} while (frame != null);
}
catch (EndOfStreamException)
{
// not necessarily a problem
}
}
private void CreateTableBackground(object obj)
{
while (!this.tableCreated)
{
lock (repositionLock)
{
Mp3Index lastIndex = this.TableOfContents.Last();
if (lastIndex != null)
{
var lastStreamPosition = Mp3Stream.Position;
Mp3Stream.Position = tableCreatPosition;
Mp3Frame frame = null;
try
{
do
{
var index = new Mp3Index();
index.FilePosition = Mp3Stream.Position;
index.SamplePosition = totalSamples;
frame = ReadNextFrame(false);
if (frame != null)
{
ValidateFrameFormat(frame);
totalSamples += frame.SampleCount;
index.SampleCount = frame.SampleCount;
index.ByteCount = (int)(Mp3Stream.Position - index.FilePosition);
tableCreatPosition = index.FilePosition + index.ByteCount;
TableOfContents.Add(index);
}
} while (frame != null);
}
catch (Exception)
{
}
if (!Mp3Stream.CanRead)
{
if (frame == null)
{
this.tableCreated = true;
}
}
Mp3Stream.Position = lastStreamPosition;
}
}
Thread.Sleep(1000);
}
}
