private void BufferProc(object o)
{
var resetEvent = o as EventWaitHandle;
try
{
if (_stream == null || _stream.CanRead == false)
{
throw new Exception("Mp3WebStream not initialized");
}
byte[] buffer = null;
int read;
Mp3Format format, prevFormat;
Mp3Frame frame;
read = ReadRawDataFromFrame(ref buffer, out frame);
format = new Mp3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength,
frame.BitRate);
_buffer = new FixedSizeBuffer <byte>(format.BytesPerSecond * 2);
do
{
_buffer.Write(buffer, 0, read);
read = ReadRawDataFromFrame(ref buffer, out frame);
prevFormat = format;
format = new Mp3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength,
frame.BitRate);
} while (_buffer.Buffered < _buffer.Length / 10 || !format.Equals(prevFormat));
if (resetEvent != null)
{
resetEvent.Set();
}
do
{
Debug.WriteLine("Buffering");
if (_buffer.Buffered >= _buffer.Length * 0.85 && !_disposing)
{
Thread.Sleep(250);
}
else
{
_buffer.Write(buffer, 0, read);
read = ReadRawDataFromFrame(ref buffer, out frame);
}
} while (!_disposing);
}
finally
{
if (resetEvent != null)
{
resetEvent.Set();
}
}
}
private void ParseForMp3Frames(Stream stream, bool enableSeeking)
{
Mp3Frame frame = null;
long offsetOfFirstFrame = 0;
stream = new BufferedStream(stream);
if (enableSeeking)
{
while (ID3v2.SkipTag(stream))
{
/* skip all id3 tags (see https://github.com/filoe/cscore/issues/63)
* there are some files with multiple id3v2 tags
* not sure whether this is according to the id3 specification but we have to handle it anyway
* as long as the SkipTag method returns true, another id3 tag has been found
*/
}
}
while (frame == null)
{
if (enableSeeking && stream.IsEndOfStream())
{
break;
}
if (enableSeeking)
{
offsetOfFirstFrame = stream.Position;
}
frame = Mp3Frame.FromStream(stream);
}
if (frame == null)
{
throw new Exception("Could not find any MP3-Frames in the stream.");
}
if (enableSeeking)
{
XingHeader xingHeader = XingHeader.FromFrame(frame);
if (xingHeader != null)
{
offsetOfFirstFrame = stream.Position;
}
}
_inputFormat = new Mp3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength, frame.BitRate);
//Prescan stream
if (enableSeeking)
{
_frameInfoCollection = new FrameInfoCollection();
while (_frameInfoCollection.AddFromMp3Stream(stream))
{
}
stream.Position = offsetOfFirstFrame;
}
}