/// <summary>
/// Write a buffer of uncompressed PCM data to the buffer.
/// </summary>
/// <param name="buffer">Byte array defining the buffer to write.</param>
/// <param name="index">Index of first value to write</param>
/// <param name="count">NUmber of byte to write. Must be multiple of PCM sample size <see cref="yeti.wma.WmaWriterConfig.Format.nBlockAlign"/></param>
public override void Write(byte[] buffer, int index, int count)
{
if ((count % m_InputDataFormat.nBlockAlign) == 0)
{
INSSBuffer buff;
NSSBuffer nssBuff;
m_Writer.AllocateSample((uint)count, out buff);
using (nssBuff = new NSSBuffer(buff))
{
nssBuff.Write(buffer, index, count);
nssBuff.Length = (uint)count;
m_Writer.WriteSample(0, m_MsAudioTime * 10000, 0, buff);
}
m_MsAudioTime += ((ulong)count * 1000) / (ulong)m_InputDataFormat.nAvgBytesPerSec;
}
else
{
throw new ArgumentException(string.Format("Invalid buffer size. Buffer size must be aligned to {0} bytes.", m_InputDataFormat.nBlockAlign), "count");
}
}
public void OnHeader([In, MarshalAs(UnmanagedType.Interface)] INSSBuffer pHeader)
{
byte[] buffer;
uint length;
var manBuff = pHeader as ManBuffer;
if (manBuff != null)
{
buffer = manBuff.Buffer;
length = manBuff.UsedLength;
manBuff.Dispose();
}
else
{
using (var b = new NSSBuffer(pHeader))
{
length = b.Length;
buffer = new byte[length];
b.Read(buffer, 0, (int)length);
}
}
if (!m_HeaderWrote)
{
if (BaseStream.CanSeek)
{
m_HeaderPosition = BaseStream.Position;
m_HeaderLength = length;
}
m_HeaderWrote = true;
base.Write(buffer, 0, (int)length);
}
else if (BaseStream.CanSeek && (length == m_HeaderLength))
{
long pos = BaseStream.Position;
BaseStream.Position = m_HeaderPosition;
BaseStream.Write(buffer, 0, (int)length);
BaseStream.Position = pos;
}
}
public override long Seek(long offset, SeekOrigin origin)
{
if (CanSeek)
{
switch (origin)
{
case SeekOrigin.Current:
offset += m_Position;
break;
case SeekOrigin.End:
offset += m_Length;
break;
}
if (offset == m_Position)
{
return m_Position; // :-)
}
if ((offset < 0) || (offset > m_Length))
{
throw new ArgumentException("Offset out of range", "offset");
}
if ((offset % SeekAlign) > 0)
{
throw new ArgumentException(string.Format("Offset must be aligned by a value of SeekAlign ({0})", SeekAlign), "offset");
}
ulong sampleTime = BytePosition2SampleTime(offset);
m_Reader.SetRange(sampleTime, 0);
m_Position = offset;
if (m_BufferReader != null)
{
Marshal.ReleaseComObject(m_BufferReader.Buffer);
}
m_BufferReader = null;
return offset;
}
throw new NotSupportedException();
}
public void OnDataUnit([In, MarshalAs(UnmanagedType.Interface)] INSSBuffer pDataUnit)
{
byte[] buffer;
int length;
var manBuff = pDataUnit as ManBuffer;
if (manBuff != null)
{
buffer = manBuff.Buffer;
length = (int)manBuff.UsedLength;
manBuff.Dispose();
}
else
{
using (var b = new NSSBuffer(pDataUnit))
{
length = (int)b.Length;
buffer = new byte[length];
b.Read(buffer, 0, length);
}
}
base.Write(buffer, 0, length);
}
public override int Read(byte[] buffer, int offset, int count)
{
if (m_Reader != null)
{
int read = 0;
if ((m_Length > 0) && ((m_Length - m_Position) < count))
{
count = (int)(m_Length - m_Position);
}
if (m_BufferReader != null)
{
while ((m_BufferReader.Position < m_BufferReader.Length) && (read < count))
{
read += m_BufferReader.Read(buffer, offset, count);
}
}
while (read < count)
{
INSSBuffer sample = null;
try
{
uint flags = 0;
ulong duration = 0;
ulong sampleTime = 0;
m_Reader.GetNextSample(m_OuputStream, out sample, out sampleTime, out duration, out flags, out m_OutputNumber, out m_OuputStream);
}
catch (COMException e)
{
if (e.ErrorCode == WM.NS_E_NO_MORE_SAMPLES)
{ //No more samples
if (m_OutputFormat.wBitsPerSample == 8)
{
while (read < count)
{
buffer[offset + read] = 0x80;
read++;
}
}
else
{
Array.Clear(buffer, offset + read, count - read);
read = count;
}
break;
}
else
{
throw (e);
}
}
if (m_BufferReader != null)
{
m_BufferReader.Reset(sample);
}
else
{
m_BufferReader = new NSSBuffer(sample);
}
read += m_BufferReader.Read(buffer, offset + read, count - read);
}
if ((m_BufferReader != null) && (m_BufferReader.Position >= m_BufferReader.Length))
{
m_BufferReader.Dispose();
m_BufferReader = null;
}
m_Position += read;
return read;
}
throw new ObjectDisposedException(this.ToString());
}
