public bool AddFromMP3Stream(Stream stream)
{
try
{
MP3FrameInfo info = new MP3FrameInfo();
info.StreamPosition = stream.Position;
info.SampleIndex = TotalSamples;
frame = MP3Frame.FromStream(stream);
if (frame != null)
{
info.SampleAmount = frame.SampleCount;
info.Size = Convert.ToInt32(stream.Position - info.StreamPosition);
TotalSamples += frame.SampleCount;
Add(info);
return(true);
}
else
{
return(false);
}
}
catch (Exception)
{
return(false);
}
}
private MP3Frame GetNextFrame(Stream stream)
{
MP3Frame frame;
do
{
frame = MP3Frame.FromStream(stream, ref _frameBuffer);
} while (frame == null);
return(frame);
}
private MP3Frame ReadNextMP3Frame()
{
MP3Frame frame = MP3Frame.FromStream(_stream, ref _frameBuffer);
if (frame != null && _frameInfoCollection != null)
{
_frameInfoCollection.PlaybackIndex++;
}
return(frame);
}
private void ParseForMP3Frame(Stream stream)
{
if (_parsedStream)
{
return;
}
MP3Frame frame = null;
long offsetOfFirstFrame = 0;
while (frame == null && !stream.IsEndOfStream())
{
offsetOfFirstFrame = stream.Position;
frame = MP3Frame.FromStream(stream);
}
if (frame == null)
{
throw new MP3Exception("Could not find any MP3-Frames in the stream.");
}
XingHeader xingHeader = XingHeader.FromFrame(frame);
if (xingHeader != null)
{
offsetOfFirstFrame = stream.Position;
}
_inputFormat = new MP3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength, frame.BitRate); //implement VBR?
//Prescan stream
_frameInfoCollection = new FrameInfoCollection();
while (_frameInfoCollection.AddFromMP3Stream(stream))
{
;
}
stream.Position = offsetOfFirstFrame;
_parsedStream = true;
}
public MP3Stream(Stream stream, bool scanStream, int lengthOffset)
{
int frameLength = 0;
if (scanStream)
{
_frameInfoCollection = new FrameInfoCollection();
}
else
{
_frameInfoCollection = null;
}
_dataStartIndex = stream.Position;
do
{
_frame = MP3Frame.FromStream(stream);
if (_frame == null && stream.IsEndOfStream())
{
throw new FormatException("Stream is no MP3-stream. No MP3-Frame was found.");
}
} while (_frame == null && !stream.IsEndOfStream());
frameLength = _frame.FrameLength;
_sampleRate = _frame.SampleRate;
XingHeader = XingHeader.FromFrame(_frame); //The first frame can contain a Xingheader
if (XingHeader != null)
{
//Todo: dataInitPosition = stream.Position
_dataStartIndex = stream.Position;
}
_dataLength = stream.Length - _dataStartIndex - lengthOffset;
if (scanStream)
{
stream.Position = _dataStartIndex;
PreScanFile(stream);
CanSeek = true;
}
else
{
CanSeek = false;
}
stream.Position = _dataStartIndex;
/*
* bytes * 8 (8bits perbyte) / ms = totalbits / totalms = bits per ms
*/
if (scanStream)
{
_bitRate = ((_dataLength * 8.0) / ((double)_frameInfoCollection.TotalSamples / (double)_sampleRate));
}
else
{
_bitRate = ((_frame.BitRate) / 1);
}
MP3Format = new MP3Format(_sampleRate, _frame.ChannelCount, frameLength, (int)Math.Round(_bitRate));
_converter = new AcmConverter(MP3Format);
WaveFormat = _converter.DestinationFormat;
//_bytesPerSample = (WaveFormat.BitsPerSample / 8 * WaveFormat.Channels);
_pcmDstBuffer = new byte[SamplesPerFrame * WaveFormat.BytesPerBlock * 2];
stream.Position = _dataStartIndex;
_stream = stream;
}