User`s manual

140 Reference Manual
2 OSD string frame
X1, Y1, address1, address 2, 0x0000, X3, Y3, address 3, address
4, 0x0000, 0xAAAA
4 OSD string frame
X1, Y1, address1, 0x0000, X2, Y2, address 2, X3, Y3, address 3,
X4, Y4, address 4, 0x0000, 0xAAAA
Notes:
X Xn, Yn means the 1, 2, 3, 4 sub bitmap’s X,Y position, for
example, sub bitmap 1’s X/Y is (0,0), sub bitmap 3’s X/Y is
(0,1)
X Address[n] means 1,2,3,4 sub bitmap’s address in firmware,
this address is decided when bitmap is downloaded.
X 32*32 bitmap are software features, customer application
should know the bitmap address map in firmware and cre-
ate the corresponding OSD frame which contains multiple
OSD string, with corresponding X/Y value. The Avstream
driver only provides API functions to download bitmap and
write OSD frames to the firmware.
OSD features in Demo application
Customer scan develop their own font bitmap for their certain
application.
We provided the following features by providing 6 demo font files:
Eng16_1.osd 16*16 ASCII characters, default color
Eng16_2.osd 16*16 ASCII characters, customized color
Eng_hollow.osd 32*32 ASCII characters, two colors (body/
boarder)
Chn16_1.osd 16*16 Chinese characters, default
Chn16_2.osd 16*16 Chinese characters, customized color
Chn_hollow.osd 32*32 Chinese characters, two colors (body/