Note

This is the documentation for the latest development branch and may refer to features that are not available in released versions. If you are looking for the documentation for a specific release, use the drop-down menu on the left and select the desired version.

VO Mix Sorting Demo

Introduction

This example demonstrates how to use the K230’s VO (Video Output) module for multi-channel video mixing and sorting display. This functionality is commonly used in scenarios such as multi-channel monitoring and picture-in-picture.

Feature Description

VO Mix Sorting Function

This example showcases the VO’s mix sorting capabilities:

• Multi-channel video input: Supports simultaneous input of multiple video streams

• Video mixing: Mixes multiple video streams for display

• Picture-in-picture: Supports picture-in-picture functionality

• Layer management: Manages the display priority of different video layers

• Region settings: Sets the display region for each video stream

Supported Features

• Multi-channel input: Supports multiple video input channels

• Mix mode: Supports multiple mix modes

• Scaling: Supports video scaling

• Position adjustment: Adjustable video display position

Code Location

Demo source location: src/rtsmart/examples/mpp/sample_vo_mix_order

Usage Instructions

Compilation Method

In the K230 RTOS SDK root directory, use make menuconfig to configure the compilation options, select to compile the VO mix order example into the firmware, and then compile the firmware.

Running the Example

./sample_vo_mix_order

Viewing Results

After the program runs, it will:

1. Initialize the VO module

2. Configure multiple video inputs

3. Set video mix parameters

4. Start mixed display

5. Support dynamic adjustment of video position and layer

Output example:

VO Mix Order Demo
===================

Initializing VO module...
VO initialized successfully

Configuring video mix...
Channel 0: Main video, 1920x1080, Full screen
Channel 1: Sub video 1, 640x480, Position(100,100)
Channel 2: Sub video 2, 640x480, Position(1200,100)
Channel 3: Sub video 3, 640x480, Position(100,600)

Starting video mix...
Video mix started!

Display info:
Main: 1920x1080 @ 30fps
Sub1: 640x480 @ 30fps
Sub2: 640x480 @ 30fps
Sub3: 640x480 @ 30fps

Use keys to adjust video order:
[1] Move sub1 forward
[2] Move sub1 backward
[3] Move sub2 forward
[4] Move sub2 backward
...
[Q] Quit

Press Ctrl+C to exit.

Tip

The VO mix order function can be used in application scenarios such as multi-channel monitoring and picture-in-picture. For specific interfaces of the VO module, please refer to the Display Output API Documentation.