物联网开发案例代码：
链接：https://pan.baidu.com/s/1tJL7qzWaddK4BFp5GOqY0A?pwd=56fu
3.8. HDMI_IN 图像抓取
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需要焊接 HDMI_IN 输入接口
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默认情况下这个功能是关闭,需要在kernel仓库中执行以下操作：
git revert 8998afb927200ad42b27beacc22cf1e86bfca442 -
确保存在这个补丁: firefly: AIO-3399J: enable HDMI-IN function: The HDMI-IN function is enabled, but other camera and audio functions may not be used normally.
测试脚本
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test_hdmiin-3399.sh
#!/bin/bashexport DISPLAY=:0
export XAUTHORITY=/home/firefly/.Xauthority
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
export LD_LIBRARY_PATH=/usr/lib/gstreamer-1.0WIDTH=1920
HEIGHT=1080
SINK=kmssink
#SINK=gtksinkecho autospawn = no > /home/firefly/.config/pulse/client.conf
pkill pulseaudio
sleep 1
amixer -c 1 sset 'IN1 Boost' 0
amixer -c 1 sset "RECMIXL BST1" on
amixer -c 1 sset "RECMIXR BST1" on
amixer -c 1 sset 'Mono ADC MIXR ADC1' on
amixer -c 1 sset 'Mono ADC MIXL ADC1' ongst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,format=NV12,width=${WIDTH},height=${HEIGHT}, framerate=30/1 ! videoconvert ! $SINK & # &>/dev/null &GST_PID=$!sleep 2
alsaloop -P hw:1,0 -C hw:1,0 -c 2 -t 500000 &
ALSA_PID=$!trap '{ kill -9 $GST_PID; kill -9 $ALSA_PID; }' EXIT INT TERMwait
