Hi, I'm not familiar with V4L2 so I'll ask some questions.
My enviorment is EVM8168 with VC board, EZSDK version is 5.03.01.15 and I use PSP 04.00.02.14 version.
My start-up loading script is like below.
" echo "Loading syslink"
modprobe syslink
sleep 1
echo "Loading new HDVPSS Firmware [modified by skypiri]"
./slaveloader startup VPSS-M3 ti816x_hdvpss.xem3
sleep 1
echo "Loading VPSS"
modprobe vpss
sleep 1
echo "Loading FrameBuffer"
modprobe ti81xxfb vram=0:40M,1:1M,2:1M
sleep 1
echo "Loading ti81xxvo"
modprobe ti81xxvo
sleep 1
echo "Loading tvp7002"
modprobe tvp7002
sleep 1
echo "Loading ti81xxvin"
modprobe ti81xxvin
sleep 1
echo "Loading ti81xxhdmi"
modprobe ti81xxhdmi "
saLoopback application is working well with 1080i resolution camera.
1. What is the different between MMAP mode and user point mode?
2. I add simple image processing function into saLoopback application like below.
int Convert_yuv_to_gray( unsigned char *pYuvSrc, unsigned int nWidth, unsigned int nHeight )
{
/* to make YUYV to gray scale, set U, V value to 128 (0x80)*/
if( !pYuvSrc || nWidth == 0 || nHeight == 0 )
{
fprintf( stderr, "%s returns error.\n", __FUNCTION__ );
return -1;
}
unsigned int nPosYuv = 0;
unsigned int nSize = nWidth * nHeight / 2;
unsigned int nLoop = 0;
for( nLoop = 0; nLoop < nSize; nLoop++)
{
pYuvSrc[ nPosYuv + 1 ] = pYuvSrc[ nPosYuv + 3] = 0x80;
nPosYuv +=4;
}
return 0;
}
I called this function in while loop.
/* DEQUEUE CAPTURE */
/* DEQUEUE DISPLAY */
/* Exchange display and capture buffer pointers */
temp_buf.m.userptr = pCaptureObj->buf.m.userptr;
pCaptureObj->buf.m.userptr = pDisplayObj->buf.m.userptr;
// TODO here.
// Add some processing here....
Convert_yuv_to_gray( (unsigned char *)temp_buf.m.userptr, 1920, 1080 );
pDisplayObj->buf.m.userptr = temp_buf.m.userptr;
/* ENQUEUE.....*/
When I convert YUYV to gray scale then, FPS is 5~6 fps. Buf When I turned off converting function, then FPS is 30 fps.
The purpose of converting function is just for test image processing. The performance is too low than I expected.
How can I increase the total performance of image processing in Cortex A8 side.
My scenario is "capture --> image processing() --> display" or "capture --> image processing -> encoding -> RTP Tx -> RTP Rx -> display"
So I want to know how can I solve this problem.
Regards,
Jongpil
