/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Constructor, The '1' indicates there should only be 1 processing thread.
/// While you *can* set this higher, Grayscaling doesn't really
/// benefit from it. See the TypeConverter for an MFT that does.
/// </summary>
/// <history>
/// 01 Nov 18 Cynic - Ported In
/// </history>
public MFTTantaGrayscale_Async() : base(1)
{
DebugMessage("MFTTantaGrayscale_Async Constructor");
TransformImageFunction = null;
// build our list of guids of the Media Subtypes
// we are prepared to accept
m_MediaSubtypes = new Guid[] { FOURCC_NV12.ToMediaSubtype(), FOURCC_YUY2.ToMediaSubtype(), FOURCC_UYVY.ToMediaSubtype() };
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Called when the input type gets set. We record the basic image
/// size and format information here.
///
/// Expects the InputType variable to have been set. This will have been
/// done in the base class immediately before this routine gets called
///
/// An override of the virtual stub in TantaMFTBase_Async.
/// </summary>
/// <history>
/// 01 Nov 18 Cynic - Ported In
/// </history>
override protected void OnSetInputType()
{
MFError throwonhr;
m_imageWidthInPixels = 0;
m_imageHeightInPixels = 0;
m_videoFOURCC = new FourCC(0);
m_cbImageSize = 0;
m_lStrideIfContiguous = 0;
TransformImageFunction = null;
IMFMediaType pmt = InputType;
// type can be null to clear
if (pmt != null)
{
Guid subtype;
throwonhr = pmt.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out subtype);
throwonhr = MFExtern.MFGetAttributeSize(pmt, MFAttributesClsid.MF_MT_FRAME_SIZE, out m_imageWidthInPixels, out m_imageHeightInPixels);
m_videoFOURCC = new FourCC(subtype);
if (m_videoFOURCC == FOURCC_YUY2)
{
TransformImageFunction = Update_YUY2;
m_lStrideIfContiguous = m_imageWidthInPixels * 2;
}
else if (m_videoFOURCC == FOURCC_UYVY)
{
TransformImageFunction = Update_UYVY;
m_lStrideIfContiguous = m_imageWidthInPixels * 2;
}
else if (m_videoFOURCC == FOURCC_NV12)
{
TransformImageFunction = Update_NV12;
m_lStrideIfContiguous = m_imageWidthInPixels;
}
else
{
throw new COMException("Unrecognized type", (int)HResult.E_UNEXPECTED);
}
// Calculate the image size (not including padding)
int lImageSize;
if (Succeeded(pmt.GetUINT32(MFAttributesClsid.MF_MT_SAMPLE_SIZE, out lImageSize)))
{
m_cbImageSize = lImageSize;
}
else
{
m_cbImageSize = GetImageSize(m_videoFOURCC, m_imageWidthInPixels, m_imageHeightInPixels);
}
int lStrideIfContiguous;
if (Succeeded(pmt.GetUINT32(MFAttributesClsid.MF_MT_DEFAULT_STRIDE, out lStrideIfContiguous)))
{
m_lStrideIfContiguous = lStrideIfContiguous;
}
// If the output type isn't set yet, we can pre-populate it,
// since output must always exactly equal input. This can
// save a (tiny) bit of time in negotiating types.
OnSetOutputType();
}
else
{
// Since the input must be set before the output, nulling the
// input must also clear the output. Note that nulling the
// input is only valid if we are not actively streaming.
OutputType = null;
}
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Called when the input type gets set. We record the basic image
/// size and format information here.
///
/// Expects the InputType variable to have been set. This will have been
/// done in the base class immediately before this routine gets called
///
/// An override of the virtual stub in TantaMFTBase_Sync.
/// </summary>
/// <history>
/// 01 Nov 18 Cynic - Ported In
/// </history>
override protected void OnSetInputType()
{
int lImageSize;
int lStrideIfContiguous;
Guid subtype;
HResult hr;
// init some things
m_imageWidthInPixels = 0;
m_imageHeightInPixels = 0;
m_videoFOURCC = new FourCC(0);
m_cbImageSize = 0;
m_lStrideIfContiguous = 0;
TransformImageFunction = null;
// get this now, the type can be null to clear
IMFMediaType pmt = InputType;
if (pmt == null)
{
// Since the input must be set before the output, nulling the
// input must also clear the output. Note that nulling the
// input is only valid if we are not actively streaming.
OutputType = null;
return;
}
// get the subtype GUID
hr = pmt.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out subtype);
if (hr != HResult.S_OK)
{
throw new Exception("OnSetInputType call to get the subtype guid failed. Err=" + hr.ToString());
}
// get the image width and height in pixels. These will become
// very important later when the time comes to convert to grey scale
// Note that changing the size of the image on the screen, by resizing
// the EVR control does not change this image size. The EVR will
// remove various rows and columns as necssary for display purposes
hr = MFExtern.MFGetAttributeSize(pmt, MFAttributesClsid.MF_MT_FRAME_SIZE, out m_imageWidthInPixels, out m_imageHeightInPixels);
if (hr != HResult.S_OK)
{
throw new Exception("OnSetInputType call to get the image size failed failed. Err=" + hr.ToString());
}
// create a working FourCC subtype from the Guid. This only works because we can always
// figure out the FOURCC code from the subtype Guid - it is the first four hex digits in
// reverse order
m_videoFOURCC = new FourCC(subtype);
// switch based on the supported formats and set our transform function
// and other format specific based info
if (m_videoFOURCC == FOURCC_YUY2)
{
TransformImageFunction = TransformImageOfTypeYUY2;
m_lStrideIfContiguous = m_imageWidthInPixels * 2;
}
else if (m_videoFOURCC == FOURCC_UYVY)
{
TransformImageFunction = TransformImageOfTypeUYVY;
m_lStrideIfContiguous = m_imageWidthInPixels * 2;
}
else if (m_videoFOURCC == FOURCC_NV12)
{
TransformImageFunction = TransformImageOfTypeNV12;
m_lStrideIfContiguous = m_imageWidthInPixels;
}
else
{
throw new Exception("OnSetInputType Unrecognized type. Type =" + m_videoFOURCC.ToString());
}
// Calculate the image size (not including padding)
hr = pmt.GetUINT32(MFAttributesClsid.MF_MT_SAMPLE_SIZE, out lImageSize);
if (hr == HResult.S_OK)
{
// we have an attribute with the image size use that
m_cbImageSize = lImageSize;
}
else
{
// we calculate the image size from the format
m_cbImageSize = GetImageSize(m_videoFOURCC, m_imageWidthInPixels, m_imageHeightInPixels);
}
// get the default stride. The stride is the number of bytes from one row of pixels in memory
// to the next row of pixels in memory. If padding bytes are present, the stride is wider
// than the width of the image. We will need this if the frames come in IMFMediaBuffers,
// if the frames come in IMF2DBuffers we can get the stride directly from the buffer
hr = pmt.GetUINT32(MFAttributesClsid.MF_MT_DEFAULT_STRIDE, out lStrideIfContiguous);
if (hr != HResult.S_OK)
{
throw new Exception("OnSetInputType call to MFAttributesClsid.MF_MT_DEFAULT_STRIDE failed. Err=" + hr.ToString());
}
// we have an attribute with the default stride
m_lStrideIfContiguous = lStrideIfContiguous;
// If the output type isn't set yet, we can pre-populate it,
// since output must always exactly equal input. This can
// save a (tiny) bit of time in negotiating types.
OnSetOutputType();
}