VO Video Output Demo#

Introduction#

This example demonstrates how to use the K230’s VO (Video Output) module for video output. The VO module supports multiple output devices and display modes.

Function Description#

VO Functions#

This example showcases the main features of VO video output:

Multiple Output Devices: Supports HDMI, LCD, and other outputs
Multiple Display Modes: Supports different display modes
Scaling Function: Supports video scaling
Frame Rate Configuration: Configurable output frame rate
Color Space: Supports multiple color spaces

Supported Output Devices#

HDMI Output: Supports 1080P and other high resolutions
LCD Output: Supports various LCD panels
MIPI Output: MIPI interface output
BT1120 Output: BT1120 digital output

Display Features#

Resolution: Supports multiple resolutions
Refresh Rate: Supports 60Hz, 50Hz, and other refresh rates
Aspect Ratio: Supports 16:9, 4:3, and other aspect ratios
Color Space: Supports BT.601, BT.709, and others

Code Location#

Demo source code location: src/rtsmart/examples/mpp/sample_vo_video

Usage Instructions#

Compilation Method#

In the K230 RTOS SDK root directory, use make menuconfig to configure build options, select to compile the VO video output example into the firmware, and then build the firmware.

Running the Example#

./sample_vo_video <connector_type> [options]

Parameter Description#

Parameter Name	Description	Parameter Range
connector_type	Connector type	HDMI(101), LCD(20), MIPI, etc.
width	Output width	128-3840
height	Output height	64-2160
frame_rate	Frame rate	24-60

Viewing Results#

After the program runs, it will:

Initialize the VO module
Configure the output device
Configure output parameters
Start video output
Support dynamically adjusting output parameters

Output example:

VO Video Output Demo
====================

Initializing VO module...
VO initialized successfully

Configuring output device...
Connector type: 101 (HDMI)
Output resolution: 1920x1080
Frame rate: 60Hz

Starting video output...
Video output started!

Display info:
Resolution: 1920x1080
Refresh rate: 60Hz
Color space: BT.601
Aspect ratio: 16:9

Use keys to change output settings:
[1] Change resolution
[2] Change frame rate
[3] Change color space
[Q] Quit

Press Ctrl+C to exit.

Tip

Use the list_connector command to view supported connector types and enum values. VO video output is the final stage of multimedia display and needs to work with modules such as VI and VDEC. For specific interfaces of the VO module, please refer to the Display Output API Documentation.