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.

Three-Channel AHD Example

Introduction

This example demonstrates how to use the K230 chip to implement three-channel AHD (Analog High Definition) video input. AHD is an analog high-definition video transmission technology that supports 1080P resolution analog video transmission.

Function Description

AHD Features

This example demonstrates the processing of three-channel AHD video input:

• Three-Channel Video Input: Simultaneously capture three channels of AHD video

• Video Decoding: Decode AHD analog signals into digital video

• Video Output: Output the decoded video to a display device

• Video Switching: Support switching display between three channels of video

AHD Specifications

• Resolution: Support 720P, 1080P and other resolutions

• Frame Rate: 25fps or 30fps

• Color Space: YUV422 or YUV420

• Signal Type: AHD, TVI, CVI, etc.

Main Functions

• AHD video capture

• Video decoding processing

• Video display output

• Multi-channel video switching

Code Location

Demo source location: src/rtsmart/examples/integrated_poc/smart_ipc/face_detection

Usage Instructions

Compilation Method

Use make menuconfig in the K230 RTOS SDK root directory to configure the build options, select to compile the three-way AHD example into the firmware, and then compile the firmware.

Hardware Preparation

1. Prepare three AHD cameras

2. Connect the three cameras to the AHD input interfaces of the K230

3. Connect a display device (HDMI or LCD)

Running the Example

./sample_ahd

Output example:

Three-way AHD Demo
=================

Initializing AHD channels...
Channel 1: 1080P @ 30fps
Channel 2: 1080P @ 30fps
Channel 3: 720P @ 25fps

Starting video capture...
Channel 1 active, outputting to display
Use keys 1-3 to switch channels

Press '1' to switch to Channel 1
Press '2' to switch to Channel 2
Press '3' to switch to Channel 3
Press 'q' to quit

Current channel: 1
[Video display...]

Users can switch the displayed video of different channels via key presses.

Tip

AHD cameras require dedicated AHD input interfaces; please ensure the hardware supports them. For the specific interfaces of the AHD module, please refer to the VICAP API documentation.