/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Write the text on the output buffer
/// </summary>
/// <param name="outputMediaBuffer">Output buffer</param>
/// <history>
/// 01 Nov 18 Cynic - Ported In
/// </history>
private void WriteTextOnBuffer(IMFMediaBuffer outputMediaBuffer)
{
IntPtr destRawDataPtr = IntPtr.Zero; // Destination buffer.
int destStride = 0; // Destination stride.
bool destIs2D = false;
try
{
// Lock the output buffer. Use the IMF2DBuffer interface
// (if available) as it is faster
if ((outputMediaBuffer is IMF2DBuffer) == false)
{
// not an IMF2DBuffer - get the raw data from the IMFMediaBuffer
int maxLen = 0;
int currentLen = 0;
TantaWMFUtils.LockIMFMediaBufferAndGetRawData(outputMediaBuffer, out destRawDataPtr, out maxLen, out currentLen);
// the stride is always this. The Lock function does not return it
destStride = m_lStrideIfContiguous;
}
else
{
// we are an IMF2DBuffer, we get the stride here as well
TantaWMFUtils.LockIMF2DBufferAndGetRawData((outputMediaBuffer as IMF2DBuffer), out destRawDataPtr, out destStride);
destIs2D = true;
}
// count this now. We only use this to write it on the screen
m_FrameCount++;
// We could eventually offer the ability to write on other formats depending on the
// current media type. We have this hardcoded to ARGB for now
WriteImageOfTypeARGB(destRawDataPtr,
destStride,
m_imageWidthInPixels,
m_imageHeightInPixels);
// Set the data size on the output buffer. It probably is already there
// since the output buffer is the input buffer
HResult hr = outputMediaBuffer.SetCurrentLength(m_cbImageSize);
if (hr != HResult.S_OK)
{
throw new Exception("WriteTextOnBuffer call to outputMediaBuffer.SetCurrentLength failed. Err=" + hr.ToString());
}
}
finally
{
// we MUST unlock
if (destIs2D == false)
{
TantaWMFUtils.UnLockIMFMediaBuffer(outputMediaBuffer);
}
else
{
TantaWMFUtils.UnLockIMF2DBuffer((outputMediaBuffer as IMF2DBuffer));
}
}
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Get the buffers and sizes to be modified, then pass them
/// to the appropriate Update_* routine.
/// </summary>
/// <param name="inputMediaBuffer">the mediaBuffer</param>
/// <history>
/// 01 Nov 18 Cynic - Ported over
/// </history>
private void DoWork(IMFMediaBuffer inputMediaBuffer)
{
IntPtr srcRawDataPtr = IntPtr.Zero; // Source buffer.
int srcStride; // Source stride.
bool srcIs2D = false;
try
{
// Lock the input buffer. Use the IMF2DBuffer interface
// (if available) as it is faster
if ((inputMediaBuffer is IMF2DBuffer) == false)
{
// not an IMF2DBuffer - get the raw data from the IMFMediaBuffer
int maxLen = 0;
int currentLen = 0;
TantaWMFUtils.LockIMFMediaBufferAndGetRawData(inputMediaBuffer, out srcRawDataPtr, out maxLen, out currentLen);
// the stride is always this. The Lock function does not return it
srcStride = m_lStrideIfContiguous;
}
else
{
// we are an IMF2DBuffer, we get the stride here as well
TantaWMFUtils.LockIMF2DBufferAndGetRawData((inputMediaBuffer as IMF2DBuffer), out srcRawDataPtr, out srcStride);
srcIs2D = true;
}
// Invoke the image transform function.
if (TransformImageFunction != null)
{
TransformImageFunction(srcRawDataPtr, srcStride,
m_imageWidthInPixels, m_imageHeightInPixels);
}
else
{
throw new COMException("Transform type not set", (int)HResult.E_UNEXPECTED);
}
// Set the data size on the output buffer.
MFError throwonhr = inputMediaBuffer.SetCurrentLength(m_cbImageSize);
}
finally
{
if (srcIs2D == false)
{
TantaWMFUtils.UnLockIMFMediaBuffer(inputMediaBuffer);
}
else
{
TantaWMFUtils.UnLockIMF2DBuffer((inputMediaBuffer as IMF2DBuffer));
}
}
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Given the input and output media buffers, do the transform.
/// </summary>
/// <param name="inputMediaBuffer">Input buffer</param>
/// <param name="outputMediaBuffer">Output buffer</param>
/// <history>
/// 01 Nov 18 Cynic - Ported In
/// </history>
private void ConvertMediaBufferToGrayscale(IMFMediaBuffer inputMediaBuffer, IMFMediaBuffer outputMediaBuffer)
{
IntPtr destRawDataPtr = IntPtr.Zero; // Destination buffer.
int destStride = 0; // Destination stride.
bool destIs2D = false;
IntPtr srcRawDataPtr = IntPtr.Zero; // Source buffer.
int srcStride; // Source stride.
bool srcIs2D = false;
if (TransformImageFunction == null)
{
throw new COMException("Transform type not set", (int)HResult.E_UNEXPECTED);
}
try
{
// Lock the output buffer. Use the IMF2DBuffer interface
// (if available) as it is faster
if ((outputMediaBuffer is IMF2DBuffer) == false)
{
// not an IMF2DBuffer - get the raw data from the IMFMediaBuffer
int maxLen = 0;
int currentLen = 0;
TantaWMFUtils.LockIMFMediaBufferAndGetRawData(outputMediaBuffer, out destRawDataPtr, out maxLen, out currentLen);
// the stride is always this. The Lock function does not return it
destStride = m_lStrideIfContiguous;
}
else
{
// we are an IMF2DBuffer, we get the stride here as well
TantaWMFUtils.LockIMF2DBufferAndGetRawData((outputMediaBuffer as IMF2DBuffer), out destRawDataPtr, out destStride);
destIs2D = true;
}
// Lock the input buffer. Use the IMF2DBuffer interface
// (if available) as it is faster
if ((inputMediaBuffer is IMF2DBuffer) == false)
{
// not an IMF2DBuffer - get the raw data from the IMFMediaBuffer
int maxLen = 0;
int currentLen = 0;
TantaWMFUtils.LockIMFMediaBufferAndGetRawData(inputMediaBuffer, out srcRawDataPtr, out maxLen, out currentLen);
// the stride is always this. The Lock function does not return it
srcStride = m_lStrideIfContiguous;
}
else
{
// we are an IMF2DBuffer, we get the stride here as well
TantaWMFUtils.LockIMF2DBufferAndGetRawData((inputMediaBuffer as IMF2DBuffer), out srcRawDataPtr, out srcStride);
srcIs2D = true;
}
// Invoke the image transform function.
TransformImageFunction(destRawDataPtr,
destStride,
srcRawDataPtr,
srcStride,
m_imageWidthInPixels,
m_imageHeightInPixels);
// Set the data size on the output buffer.
HResult hr = outputMediaBuffer.SetCurrentLength(m_cbImageSize);
if (hr != HResult.S_OK)
{
throw new Exception("ConvertMediaBufferToGrayscale call to outputMediaBuffer.SetCurrentLength failed. Err=" + hr.ToString());
}
}
finally
{
// we MUST unlock
if (destIs2D == false)
{
TantaWMFUtils.UnLockIMFMediaBuffer(outputMediaBuffer);
}
else
{
TantaWMFUtils.UnLockIMF2DBuffer((outputMediaBuffer as IMF2DBuffer));
}
if (srcIs2D == false)
{
TantaWMFUtils.UnLockIMFMediaBuffer(inputMediaBuffer);
}
else
{
TantaWMFUtils.UnLockIMF2DBuffer((inputMediaBuffer as IMF2DBuffer));
}
}
}