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/**************************************************************************
A/V Stream Camera Sample
Copyright (c) 2001, Microsoft Corporation.
File:
CNV12Synthesizer.h
Abstract:
This file defines a class that implements NV12 image synthesis.
CNV12Synthesis is derived from CYUVSynthesis. It uses the YUV color
space and defines a Commit() function that reformats pixels into the
NV12 format. From MSDN:
A format in which all Y samples are found first in memory as an
array of unsigned char with an even number of lines (possibly with
a larger stride for memory alignment). This is followed immediately
by an array of unsigned char containing interleaved Cb and Cr
samples. If these samples are addressed as a little-endian WORD
type, Cb would be in the least significant bits and Cr would be in
the most significant bits with the same total stride as the Y
samples. NV12 is the preferred 4:2:0 pixel format.
A visual representation of the layout:
YYYY
YYYY
UVUV
History:
created 4/16/2013
**************************************************************************/
#pragma once
class CNV12Synthesizer :
public CYUVSynthesizer
{
public:
//
// DEFAULT CONSTRUCTOR
//
CNV12Synthesizer (
ULONG Width=0,
ULONG Height=0
) :
CYUVSynthesizer("NV12", Width, Height)
{
NT_ASSERT( ( Width % 2 ) == 0 );
NT_ASSERT( ( Height % 2 ) == 0 );
m_OutputStride = Width * sizeof(BYTE);
}
//
// Commit
//
// Copy (and reformat, if necessary) pixels from the internal scratch
// buffer. If the output format decimates chrominance, do it here.
//
virtual
_Success_(return > 0)
ULONG
Commit(
_Out_writes_bytes_(Size)
PUCHAR Buffer,
_In_ ULONG Size,
_In_ ULONG Stride
);
};
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