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Add support for YUV 4:2:0 NV12 frame format in VFW camera capture

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This commit is contained in:
Josh Lubawy 2016-03-16 23:38:17 -07:00
parent 1cd3c6f364
commit f715e5b0b2
1 changed files with 13 additions and 2 deletions
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15
modules/videoio/src/cap_vfw.cpp
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@ -43,6 +43,8 @@
#include <vfw.h>
#include <cstdio>
#ifdef __GNUC__
#define WM_CAP_FIRSTA (WM_USER)
#define capSendMessage(hwnd,m,w,l) (IsWindow(hwnd)?SendMessage(hwnd,m,w,l):0)
@ -498,8 +500,17 @@ IplImage* CvCaptureCAM_VFW::retrieveFrame(int)
frame = cvCreateImage( cvSize( vfmt0.biWidth, vfmt0.biHeight ), 8, 3 );
}
if( vfmt0.biCompression != BI_RGB ||
vfmt0.biBitCount != 24 )
if ( vfmt0.biCompression == MAKEFOURCC('N','V','1','2') )
{
// Frame is in YUV 4:2:0 NV12 format, convert to BGR color space
// See https://msdn.microsoft.com/en-us/library/windows/desktop/dd206750(v=vs.85).aspx#nv12)
IplImage src;
cvInitImageHeader( &src, cvSize( vfmt0.biWidth, vfmt0.biHeight * 3 / 2 ), IPL_DEPTH_8U, 1, IPL_ORIGIN_BL, 4 );
cvSetData( &src, hdr->lpData, src.widthStep );
cvCvtColor( &src, frame, CV_YUV2BGR_NV12 );
}
else if( vfmt0.biCompression != BI_RGB ||
vfmt0.biBitCount != 24 )
{
BITMAPINFOHEADER vfmt1 = icvBitmapHeader( vfmt0.biWidth, vfmt0.biHeight, 24 );