Note

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VO OSD Demo

Overview

This sample demonstrates how to use the VO OSD (On-Screen Display) module on K230 to overlay text, graphics, timestamps, and logos on top of video.

Functional Description

OSD Functions

This sample demonstrates the following OSD capabilities:

• text overlays

• graphic drawing overlays

• time and date display

• region configuration

• transparency control

Supported OSD Types

• text overlays

• graphic overlays

• timestamp overlays

• logo overlays

OSD Characteristics

• multi-layer support

• color configuration

• font-size configuration

• dynamic content update

Source Location

Demo source path: src/rtsmart/examples/mpp/sample_vo_osd

Usage

Build Method

In the K230 RTOS SDK root directory, run make menuconfig, enable the VO OSD sample, then rebuild the firmware.

Run Example

./sample_vo_osd

Expected Result

After running, the sample will:

1. initialize VO

2. configure video output

3. create OSD layers

4. configure OSD parameters

5. display OSD content

Example output:

VO OSD Demo
=============

Initializing VO module...
VO initialized successfully

Configuring OSD layer...
OSD layer created

Setting OSD content...
Text: "K230 RTOS Demo"
Color: White
Position: Top left
Font: Large

Starting OSD display...
OSD display started!

Display info:
Video: 1920x1080 @ 30fps
OSD layer 1: Active
Text: "K230 RTOS Demo"
Time: 2025-02-03 18:30:00

Use keys to change OSD content:
[1] Change text
[2] Change color
[3] Change position
[T] Update time
[C] Clear OSD
[Q] Quit

Press Ctrl+C to exit.

Tip

OSD can be used to display status, logos, and timestamps, and supports dynamic updates. For VO APIs, refer to Display Output API.