Intel 82830M GMCH, 82854 GMCH manual Icegdescapevbiupdate

7.1.1.11ICEGD_ESCAPE_VBI_UPDATE

Input Data Structure

Output Data Structure

Notes

vbi_data

N/A

Description

This escape code is used to call port driver to update VBI. It passes VBI line information to the TV encoder to insert into the analog TV signal. Before you update VBI, you should enable VBI, and disable VBI after the update has completed. There should be a short wait between every update operation.

Input Data Structure Definition

Please refer to igd_public.h for vbi data structure details.

Example

vbi_data* pvbi = 0;

pvbi = (vbi_data*)malloc( sizeof(vbi_data) + 2 ); pvbi->unFlags = VERSION_1; pvbi->unDataLength = 2;

/* CC, CGMS (line 21) */ pvbi->unDataType = LINE_21_FIELD_1;

//enable vbi ExtEscape(

Hdc,

ICEGD_ESCAPE_VBI_ENABLE, 0,

NULL,

0, NULL );

//selects paint-on style pvbi->pucData[ 0 ] = 0x14; pvbi->pucData[ 1 ] = 0x29; ExtEscape(

Hdc,

ICEGD_ESCAPE_VBI_UPDATE, sizeof(vbi_data) + 2, (const char*)pvbi,

0,

NULL);

//33 is the time between byte updates. TV seems unable to handle it too fast. Sleep(33);

//select position and color(green) pvbi->pucData[ 0 ] = 0x11; pvbi->pucData[ 1 ] = 0x62; ExtEscape(

Hdc,

ICEGD_ESCAPE_VBI_UPDATE, sizeof(vbi_data) + 2, (const char*)pvbi,

0,

NULL);

Sleep(33);

//display a string "ababababab" for(int i=0;i<5;i++){

pvbi->pucData[ 0 ] = 'a'; pvbi->pucData[ 1 ] = 'b';

40Intel® Digital Set Top Box Display Driver User’s Guide for Microsoft* Windows* CE 5.0