public override void Write(byte[] buffer, int offset, int count)
{
do
{
int cb = 0;
int bufferSize = hdr1.cbSrcLength;
if (ptrBuffer1 == hdr1.cbSrcLength || count == 0)
{
if (count == 0)
{
hdr1.cbSrcLength = ptrBuffer1;
}
AcmStreamConvertFlags flags;
flags = AcmStreamConvertFlags.BLOCKALIGN;
if (firstBlock)
{
flags = AcmStreamConvertFlags.START;
firstBlock = false;
}
else if (count != 0 || ptrBuffer1 > 0)
{
flags = AcmStreamConvertFlags.BLOCKALIGN;
}
else
{
flags = AcmStreamConvertFlags.END;
}
MMResult mmr = AcmNativeMethods.acmStreamConvert(hStreamComp, ref hdr1, flags);
ptrBuffer1 = 0;
hdr1.cbSrcLength = bufferSize;
base.Write(outBuffer1, 0, hdr1.cbDstLengthUsed);
}
cb = Math.Min(hdr1.cbSrcLength - ptrBuffer1, count);
Array.Copy(buffer, offset, inBuffer1, ptrBuffer1, cb);
count -= cb;
ptrBuffer1 += cb;
offset += cb;
} while (count > 0);
}
protected override void LoadHeader()
{
base.LoadHeader();
byte[] fmtIn = _fmt.GetBytes();
if (_fmt2 == null)
{
_fmt2 = WaveFormat2.GetPCMWaveFormat(_fmt.SamplesPerSec, _fmt.Channels, _fmt.BitsPerSample != 0 ? _fmt.BitsPerSample : (short)16);
}
byte[] fmtOut = _fmt2.GetBytes();
MMResult mmr;
_fmt2 = new WaveFormat2(fmtOut);
mmr = AcmNativeMethods.acmStreamOpen(out hStreamComp, IntPtr.Zero, fmtIn, fmtOut, IntPtr.Zero, 0, 0, AcmStreamOpenFlags.CALLBACK_NULL);
hdr1 = new ACMSTREAMHEADER();
hdr1.cbStruct = Marshal.SizeOf(hdr1);
hdr2 = new ACMSTREAMHEADER();
hdr2.cbStruct = Marshal.SizeOf(hdr2);
int cbIn = (_fmt.AvgBytesPerSec * DefaultBufferSizeInSeconds / _fmt.BlockAlign + 1) * _fmt.BlockAlign;
inBuffer1 = new byte[cbIn];
inBuffer2 = new byte[cbIn];
int cbOut = _fmt2.BlockAlign * _fmt2.AvgBytesPerSec * DefaultBufferSizeInSeconds;
mmr = AcmNativeMethods.acmStreamSize(hStreamComp, cbIn, out cbOut, AcmStreamSizeFlags.SOURCE);
outBuffer1 = new byte[cbOut];
outBuffer2 = new byte[cbOut];
hinBuffer1 = GCHandle.Alloc(inBuffer1, GCHandleType.Pinned);
houtBuffer1 = GCHandle.Alloc(outBuffer1, GCHandleType.Pinned);
hinBuffer2 = GCHandle.Alloc(inBuffer2, GCHandleType.Pinned);
houtBuffer2 = GCHandle.Alloc(outBuffer2, GCHandleType.Pinned);
hdr1.pbSrc = hinBuffer1.AddrOfPinnedObject();
hdr1.pbDst = houtBuffer1.AddrOfPinnedObject();
hdr1.cbSrcLength = cbIn;
hdr1.cbDstLength = cbOut;
hdr2.pbSrc = hinBuffer2.AddrOfPinnedObject();
hdr2.pbDst = houtBuffer2.AddrOfPinnedObject();
hdr2.cbSrcLength = cbIn;
hdr2.cbDstLength = cbOut;
ptrBuffer1 = ptrBuffer1 = 0;
bufferRead = new SlidingBuffer(cbOut);
firstBlock = true;
bufferRead.BufferStarving = (BufferStarvingHandler) delegate(SlidingBuffer obj, int spaceAvailable)
{
if (hdr1.cbDstLengthUsed == ptrBuffer1)
{
int cb = ReadInternal(inBuffer1, 0, inBuffer1.Length);
if (cb == 0)
{
return(0);
}
ptrBuffer1 = 0;
AcmStreamConvertFlags flags;
if (firstBlock)
{
flags = AcmStreamConvertFlags.START;
firstBlock = false;
}
else if (cb == inBuffer1.Length)
{
flags = AcmStreamConvertFlags.BLOCKALIGN;
}
else
{
flags = AcmStreamConvertFlags.END;
}
hdr1.cbSrcLength = cb;
MMResult res = AcmNativeMethods.acmStreamConvert(hStreamComp, ref hdr1, flags);
return(cb);
}
int written = obj.Append(outBuffer1, ptrBuffer1, hdr1.cbDstLengthUsed - ptrBuffer1);
ptrBuffer1 += written;
return(written);
};
mmr = AcmNativeMethods.acmStreamPrepareHeader(hStreamComp, ref hdr1, 0);
mmr = AcmNativeMethods.acmStreamPrepareHeader(hStreamComp, ref hdr2, 0);
}
