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Diffstat (limited to 'avscamera/sys/NV12Synthesizer.cpp')
| -rw-r--r-- | avscamera/sys/NV12Synthesizer.cpp | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/avscamera/sys/NV12Synthesizer.cpp b/avscamera/sys/NV12Synthesizer.cpp deleted file mode 100644 index 2cdbf71b..00000000 --- a/avscamera/sys/NV12Synthesizer.cpp +++ /dev/null @@ -1,183 +0,0 @@ -/************************************************************************** - - A/V Stream Camera Sample - - Copyright (c) 2001, Microsoft Corporation. - - File: - - CNV12Synthesizer.h - - Abstract: - - This file contains the implementation of CNV12Synthesizer. - - CNV12Synthesizer is derived from CYUVSynthesizer. 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 4/14/2013 - -**************************************************************************/ - -#include "Common.h" - -/************************************************************************** - - LOCKED CODE - -**************************************************************************/ - -#ifdef ALLOC_PRAGMA -#pragma code_seg() -#endif // ALLOC_PRAGMA - - -// suppressed due to Esp:773 -#pragma warning (push) -#pragma warning( disable:26015 ) // Suppress OACR error. Seems nonsensical. TODO: Must revisit. -#pragma warning( disable:26019 ) -_Success_(return > 0) -ULONG -CNV12Synthesizer:: -Commit( - _Out_writes_bytes_(Size) - PUCHAR Buffer, - _In_ ULONG Size, - _In_ ULONG Stride -) -/*++ - -Routine Description: - - Copy (and reformat, if necessary) pixels from the internal scratch - buffer. If the output format decimates chrominance, do it here. - -Arguments: - - Buffer - - The output buffer to fill. - - Size - - The size of the output buffer in bytes. - - Stride - - The length of a row in bytes. - -Return Value: - - Number of bytes copied into Buffer. - ---*/ -{ - // We assume the output stride is the same as the original width here. - UNREFERENCED_PARAMETER(Stride); - - // The code actually handles this gracefully. It rounds down. - NT_ASSERT( (m_Width&1) == 0 ); - NT_ASSERT( (m_Height&1) == 0 ); - - // These are impossible conditions. - if( !( Buffer && - m_Buffer && - (Size%6)==0 && // Should be evenly divisible by 1 macropixel - Size>=6 // At least 1 macropixel - ) ) - { - NT_ASSERT(FALSE); - return 0; - } - - ULONG MacroPixelsWide = m_Width/2; - - // Impossible. - if( MacroPixelsWide==0 ) - { - NT_ASSERT(FALSE); - return 0; - } - - // At most, 2/3rds of the available space is used by the Y plane. - // Notice that we limit the number of macro pixel rows to what will - // fit in the space available, no matter what is in the original. - ULONG Y_limit = (Size /3) * 2; - ULONG MacroPixelsHigh = min( m_Height, Y_limit/m_Width)/2; - - // Impossible. - if( MacroPixelsHigh==0 ) - { - NT_ASSERT(FALSE); - return 0; - } - - // Now we work back to arrive at the Y & UV plane sizes. - ULONG UV_size = MacroPixelsWide * MacroPixelsHigh *2; - ULONG Y_size = MacroPixelsWide * MacroPixelsHigh *4; - ULONG YUV_size = Y_size + UV_size; - - // Impossible. - if( Size < YUV_size ) - { - NT_ASSERT(FALSE); - return 0; - } - - PWORD pY = (PWORD) Buffer; - PWORD pUV = (PWORD) (Buffer + Y_size); - - for(ULONG row = 0; row < MacroPixelsHigh; row++) - { - PKS_RGBQUAD pSrc = (PKS_RGBQUAD) GetImageLocation(0, row*2); - for(ULONG col = 0; col < MacroPixelsWide; col++) - { - KS_RGBQUAD TL = pSrc[0]; - KS_RGBQUAD TR = pSrc[1]; - KS_RGBQUAD BL = pSrc[m_Width+0]; - KS_RGBQUAD BR = pSrc[m_Width+1]; - pSrc += 2; - - // Copy luma first - pY[0] = MAKEWORD(TL.rgbGreen, TR.rgbGreen); - pY[MacroPixelsWide] = MAKEWORD(BL.rgbGreen, BR.rgbGreen); - pY++; - - LONG - tU = TL.rgbBlue; //top left - tU += BL.rgbBlue; //bottom left - tU += TR.rgbBlue; //top right - tU += BR.rgbBlue; //bottom right - - LONG - tV = TL.rgbRed; //top left - tV += BL.rgbRed; //bottom left - tV += TR.rgbRed; //top right - tV += BR.rgbRed; //bottom right - - // Copy decimated chroma - *pUV++ = MAKEWORD(((tU+2)>>2), ((tV+2)>>2)); - } - // Skip a scan line, since we've already copied it. - pY += MacroPixelsWide; - } - - return (ULONG) (((PUCHAR) pUV) - Buffer); -} -// suppressed due to Esp:773 -#pragma warning (pop) - |