private static int CalcOffset(MP3Frame frame)
{
int offset = 0;
if (frame.MPEGVersion == MpegVersion.Version1)
{
if (frame.ChannelMode != MP3ChannelMode.Mono)
{
offset = 32 + 4;
}
else
{
offset = 17 + 4;
}
}
else if (frame.MPEGVersion == MpegVersion.Version2)
{
if (frame.ChannelMode != MP3ChannelMode.Mono)
{
offset = 17 + 4;
}
else
{
offset = 9 + 4;
}
}
else
{
return(-1);
}
return(offset);
}
protected void Dispose(bool disposing)
{
lock (_lockObject)
{
if (disposing)
{
if (_converter != null)
{
_converter.Dispose();
_converter = null;
}
if (_stream != null)
{
_stream.Dispose();
_stream = null;
}
if (_frameInfoCollection != null)
{
_frameInfoCollection.Dispose();
_frameInfoCollection = null;
}
_pcmDstBuffer = null;
_frame = null;
}
}
}
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);
}
}
public int Read(byte[] buffer, int offset, int count)
{
if (IsEOF)
{
return(0);
}
try
{
int read = 0;
lock (_lockObject)
{
read += CheckForOverflows(buffer, ref offset, count);
if (read == count)
{
return(read); //if we've already read enough -> exit
}
while (read < count)
{
try
{
_frame = ReadNextMP3Frame();
if (_frame == null)
{
IsEOF = true;
break;
}
int converted = _converter.Convert(_frameBuffer, _frame.FrameLength, _pcmDstBuffer, 0);
int BTCC = Math.Min(count - read, converted);
Array.Copy(_pcmDstBuffer, 0, buffer, offset, BTCC);
offset += BTCC;
read += BTCC;
/*
* If there are any overflows -> store them in a
* buffer to use it next time.
*/
_overflows = ((converted > BTCC) ? (converted - BTCC) : 0);
_bufferoffset = ((converted > BTCC) ? (BTCC) : 0);
}
catch (Exception ex)
{
Debugger.Break();
Debug.WriteLine("Mp3Stream::Read: " + ex.ToString());
}
}
_position += read;
return(read);
}
}
catch (EndOfStreamException)
{
return(-1);
}
}
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);
}
protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
if (disposing)
{
for (int i = 0; i < Count; i++)
{
this[i] = null;
}
frame = null;
}
}
_disposed = true;
}
private static bool CheckForValidXingHeader(MP3Frame frame, int offset)
{
byte[] data = null;
if (frame.ReadData(ref data, 0) < 4)
{
return(false);
}
if (data[offset + 0] == 'X' && data[offset + 1] == 'i' && data[offset + 2] == 'n' && data[offset + 3] == 'g')
{
return(true);
}
else
{
return(false);
}
}
protected override int GetInputData(ref byte[] inputDataBuffer, int requested)
{
MP3Frame frame = ReadNextMP3Frame(ref inputDataBuffer);
if (frame == null)
{
inputDataBuffer = new byte[0];
return(0);
}
if (inputDataBuffer.Length > frame.FrameLength)
{
Array.Clear(inputDataBuffer, frame.FrameLength, inputDataBuffer.Length - frame.FrameLength);
}
return(frame.FrameLength);
}
public static XingHeader FromFrame(MP3Frame frame)
{
XingHeader header = new XingHeader();
int offset = CalcOffset(frame);
if (offset == -1)
{
return(null);
}
if (CheckForValidXingHeader(frame, offset))
{
header.startIndex = offset;
offset = offset + 4;
}
else
{
return(null);
}
header.HeaderFlags = (XingHeaderFlags)ReadHeaderFlags(frame, offset);
offset = offset + 4;
if ((header.HeaderFlags & XingHeaderFlags.Frames) != 0)
{
header.framesOffset = offset;
offset += 4;
}
if ((header.HeaderFlags & XingHeaderFlags.Bytes) != 0)
{
header.bytesOffset = offset;
offset += 4;
}
if ((header.HeaderFlags & XingHeaderFlags.Toc) != 0)
{
header.tocOffset = offset;
offset += 100;
}
if ((header.HeaderFlags & XingHeaderFlags.VbrScale) != 0)
{
header.vbrScale = ReadHeaderFlags(frame, offset);
offset += 4;
}
header.endIndex = offset;
return(header);
}
public static XingHeader FromFrame(MP3Frame frame)
{
XingHeader header = new XingHeader();
int offset = CalcOffset(frame);
if (offset == -1)
return null;
if (CheckForValidXingHeader(frame, offset))
{
header.startIndex = offset;
offset = offset + 4;
}
else
{
return null;
}
header.HeaderFlags = (XingHeaderFlags)ReadHeaderFlags(frame, offset);
offset = offset + 4;
if ((header.HeaderFlags & XingHeaderFlags.Frames) != 0)
{
header.framesOffset = offset;
offset += 4;
}
if ((header.HeaderFlags & XingHeaderFlags.Bytes) != 0)
{
header.bytesOffset = offset;
offset += 4;
}
if ((header.HeaderFlags & XingHeaderFlags.Toc) != 0)
{
header.tocOffset = offset;
offset += 100;
}
if ((header.HeaderFlags & XingHeaderFlags.VbrScale) != 0)
{
header.vbrScale = ReadHeaderFlags(frame, offset);
offset += 4;
}
header.endIndex = offset;
return header;
}
private static int ReadHeaderFlags(MP3Frame frame, int offset)
{
byte[] data = null;
if (frame.ReadData(ref data, 0) < 4)
{
throw new System.IO.EndOfStreamException();
}
int i = 0;
i = data[offset + 0];
i <<= 8;
i |= data[offset + 1];
i <<= 8;
i |= data[offset + 2];
i <<= 8;
i |= data[offset + 3];
return(i);
}
public static MP3Frame FromStream(Stream stream, ref byte[] data)
{
MP3Frame frame = new MP3Frame(stream);
if (frame.FindFrame(stream, false))
{
data = data.CheckBuffer(frame.FrameLength);
Array.Copy(frame._headerBuffer, 0, data, 0, 4);
int read = stream.Read(data, 4, frame.FrameLength - 4);
if (read != frame.FrameLength - 4)
{
return(null);
}
return(frame);
}
return(null);
}
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;
}
private static int CalcOffset(MP3Frame frame)
{
int offset = 0;
if (frame.MPEGVersion == MpegVersion.Version1)
{
if (frame.ChannelMode != MP3ChannelMode.Mono)
offset = 32 + 4;
else
offset = 17 + 4;
}
else if (frame.MPEGVersion == MpegVersion.Version2)
{
if (frame.ChannelMode != MP3ChannelMode.Mono)
offset = 17 + 4;
else
offset = 9 + 4;
}
else
{
return -1;
}
return offset;
}
private void BufferProc(object o)
{
if (_stream == null || _stream.CanRead == false)
{
throw new Exception("Mp3WebStream not initialized");
}
MP3Frame frame = GetNextFrame(_stream);
int channels = frame.ChannelMode == MP3ChannelMode.Stereo ? 2 : 1;
AcmConverter converter = new AcmConverter(new MP3Format(frame.SampleRate, frame.ChannelCount, frame.FrameLength, frame.BitRate));
_waveFormat = converter.DestinationFormat;
byte[] buffer = new byte[16384 * 4];
_buffer = new FixedSizeBuffer <byte>(converter.DestinationFormat.BytesPerSecond * 10);
ManualResetEvent resetEvent = o as ManualResetEvent;
resetEvent.Set();
do
{
if (_buffer.Buffered >= _buffer.Length * 0.85 && !_disposing)
{
Thread.Sleep(250);
continue;
}
try
{
frame = GetNextFrame(_stream);
//_frameBuffer is set in GetNextFrame
int count = converter.Convert(_frameBuffer, frame.FrameLength, buffer, 0);
if (count > 0)
{
int written = _buffer.Write(buffer, 0, count);
}
}
catch (MmException)
{
_disposing = true;
ThreadPool.QueueUserWorkItem((c) =>
{
while (_bufferThread.ThreadState != System.Threading.ThreadState.Stopped)
{
;
}
CreateStream(false);
});
}
catch (WebException)
{
InitializeConnection();
}
catch (IOException)
{
InitializeConnection();
}
} while (!_disposing);
if (converter != null)
{
converter.Dispose();
}
}
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;
}
private static int ReadHeaderFlags(MP3Frame frame, int offset)
{
byte[] data = null;
if (frame.ReadData(ref data, 0) < 4)
throw new System.IO.EndOfStreamException();
int i = 0;
i = data[offset + 0];
i <<= 8;
i |= data[offset + 1];
i <<= 8;
i |= data[offset + 2];
i <<= 8;
i |= data[offset + 3];
return i;
}
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;
}
public static MP3Frame FromStream(Stream stream)
{
MP3Frame frame = new MP3Frame(stream);
return(frame.FindFrame(stream, true) ? frame : null);
}
protected void Dispose(bool disposing)
{
lock (_lockObject)
{
if (disposing)
{
if (_converter != null)
{
_converter.Dispose();
_converter = null;
}
if (_stream != null)
{
_stream.Dispose();
_stream = null;
}
if (_frameInfoCollection != null)
{
_frameInfoCollection.Dispose();
_frameInfoCollection = null;
}
_pcmDstBuffer = null;
_frame = null;
}
}
}
public int Read(byte[] buffer, int offset, int count)
{
if (IsEOF)
return 0;
try
{
int read = 0;
lock (_lockObject)
{
read += CheckForOverflows(buffer, ref offset, count);
if (read == count)
return read; //if we've already read enough -> exit
while (read < count)
{
try
{
_frame = ReadNextMP3Frame();
if (_frame == null)
{
IsEOF = true;
break;
}
int converted = _converter.Convert(_frameBuffer, _frame.FrameLength, _pcmDstBuffer, 0);
int BTCC = Math.Min(count - read, converted);
Array.Copy(_pcmDstBuffer, 0, buffer, offset, BTCC);
offset += BTCC;
read += BTCC;
/*
* If there are any overflows -> store them in a
* buffer to use it next time.
*/
_overflows = ((converted > BTCC) ? (converted - BTCC) : 0);
_bufferoffset = ((converted > BTCC) ? (BTCC) : 0);
}
catch (Exception ex)
{
Debugger.Break();
Debug.WriteLine("Mp3Stream::Read: " + ex.ToString());
}
}
_position += read;
return read;
}
}
catch (EndOfStreamException)
{
return -1;
}
}
private static bool CheckForValidXingHeader(MP3Frame frame, int offset)
{
byte[] data = null;
if (frame.ReadData(ref data, 0) < 4)
return false;
if (data[offset + 0] == 'X' && data[offset + 1] == 'i' && data[offset + 2] == 'n' && data[offset + 3] == 'g')
{
return true;
}
else
return false;
}
public static MP3Frame FromStream(Stream stream)
{
MP3Frame frame = new MP3Frame(stream);
return frame.FindFrame(stream, true) ? frame : null;
}
public static MP3Frame FromStream(Stream stream, ref byte[] data)
{
MP3Frame frame = new MP3Frame(stream);
if (frame.FindFrame(stream, false))
{
data = data.CheckBuffer(frame.FrameLength);
Array.Copy(frame._headerBuffer, 0, data, 0, 4);
int read = stream.Read(data, 4, frame.FrameLength - 4);
if (read != frame.FrameLength - 4)
return null;
return frame;
}
return null;
}
