topic This is perfect. For some in Media (Intel® Video Processing Library, Intel Media SDK)

mfxFrameSurface1 Pitch size

bingol__evren — Tue, 07 May 2019 07:50:18 GMT

How and where does pitch get set? I see that

Encoder has a line
MSDK_MEMCPY_VAR(m_pVppSurfaces.Info, &(m_mfxVppParams.mfx.FrameInfo), sizeof(mfxFrameInfo));

This line sets the info struct of mfxFrameSurface1
But where does the surface.data.pitch get set of mfxFrameSurface1
Does it automatically mults width by 8 bytes and since we alight the width with MSDK_ALIGN16 ?

Thanks

Hi Evren,

Mark_L_Intel1 — Tue, 07 May 2019 21:23:28 GMT

Hi Evren,

The macro is defined here, so it belongs to our sample code.

The usage can be found in sample_utils.cpp in common directory, so the real value will be filled when dealing with actual input/output video data, like function CSmplYUVReader::LoadNextFrame().

Let me know if this answers your question.

Mark

Hi Mark.That does not answer

bingol__evren — Tue, 07 May 2019 21:37:00 GMT

Hi Mark.
That does not answer my question. My question is not the macro.
My question is HOW and Where does the pData.Pitch get set in Load Next frame.

How does the system calculate the PITCH value ?
In the encoder example we never set the pitch, so it must be calculated somewhere. I know how pitch is usually calculated and what it means but I can not see the code that sets that value in the example or commons sample code.
thanks

Hi Evren,

Mark_L_Intel1 — Tue, 07 May 2019 22:04:45 GMT

Hi Evren,

Since different frame type might have different pitch, I think this could be implementation of the virtual frame allocation function, here may be one of them:

https://github.com/Intel-Media-SDK/MediaSDK/blob/238f5a2a6f2ec6044d3ac6035adccadd7aac7fd1/_studio/shared/src/libmfx_allocator.cpp#L150

Is this helpful?

Mark

This is perfect. For some

bingol__evren — Wed, 08 May 2019 03:49:00 GMT

I found that function myself before but that pitch is a local variable in that function (line 171) and it is used to allocate the surface size.
But It is never set to to the mfxFrameSurface1.data.pitch.

UPDATE as i was looking at https://software.intel.com/en-us/node/628470 mfxFrameData struct I see that pitch is a union and I now understand because I see that PItchLow is set in the LockFrame. PitchLow is actually Pitch pretty much.

Thanks you pointed me to the right file

Good to know you have solve

Mark_L_Intel1 — Tue, 18 Jun 2019 22:08:23 GMT

Good to know you have solve the problem and thanks for the feedback.

Mark