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→Headphone interface audio playback test
<li><p>Use the '''aplay -l''' command to view the sound card devices supported by the Linux system</p>
<ol style="list-style-type: lower-alpha;">
<li><p>The output of the linux5.4 system is as follows, where '''card 0: > audiocodec''' is the sound card device required for headphone > playback</p>{| class="wikitable" style="width:800px;" |-|
<p>root@orangepi:~# '''aplay -l'''</p>
<p>**** List of PLAYBACK Hardware Devices ****</p>
<p>'''card 0: audiocodec [audiocodec], device 0: soc@3000000:codec_plat-5096000.codec 5096000.codec-0 []'''</p>
:<p>'''Subdevices: 1/1'''</p>:<p>'''Subdevice #0: subdevice #0'''</p>|}</li><li><p>The output of the b.linux6.1 system is as follows, where > '''audiocodec''' is the sound card device required for headphone > playback.</p>{| class="wikitable" style="width:800px;" |-|
<p>root@orangepi:~# '''aplay -l'''</p>
<p>**** List of PLAYBACK Hardware Devices ****</p>
<p>'''card 0: audiocodec [audiocodec], device 0: CDC PCM Codec-0 [CDC PCM Codec-0]'''</p>
:<p>'''Subdevices: 1/1'''</p>:<p>'''Subdevice #0: subdevice #0'''</p>|}</li></ol>
</li>
<li><p>Then use the '''aplay''' command to play the audio, and the sound can be heard through the headphones</p>
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<p>root@orangepi:~# '''aplay -D hw:0,0 /usr/share/sounds/alsa/audio.wav'''</p>
<p>Playing WAVE 'audio.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo</p>|}{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| </libig></ol> '''If there is noise during the headphone test, please pull out some of the headphones and do not plug them all the way in.'''</big>|}</li></ol><span id="hdmi-audio-playback-test"></span>
==== HDMI audio playback test ====
