내 작업 설정이 있습니다.RPi3 B+Chromium 브라우저의 사운드가 직접 전송되는 Raspbian을 사용하면ALSA 루프백 장치(커널 모듈로 활성화 modprobe snd-aloop) Chromium의 매개변수: --alsa-output-device='plug:front'. 전체 명령:
/usr/lib/chromium-browser/chromium-browser --ignore-autoplay-restrictions --disk-cache-size=50000000 --kiosk --disable-extensions --noerrdialogs --allow-insecure-localhost --enable-gpu-rasterization --enable-zero-copy --enable-native-gpu-memory-buffers --alsa-output-device='plug:front' https://youtu.be/nW--BbY6Z5E
PS: 출력 plug:front에서 가져왔습니다 aplay -L.
이 사운드는 루프백 캡처 장치에서 성공적으로 녹음/캡처되었습니다 hw:0,1.다크이스라이브 오디오 스트리머입니다. 다음은 관련 부분입니다./etc/darkice.cfg:
[input]
device = hw:0,1 # soundcard device for the audio input
sampleRate = 44100 # other settings have crackling audo, esp. 44100
bitsPerSample = 16 # bits per sample. try 16
channel = 2 # channels. 1 = mono, 2 = stereo
하지만 이 사운드는 라인 출력(잭)에 연결된 외부 스피커에서도 재생되어야 합니다.
어떻게 할 수 있나요? 도와주세요? 사운드 출력을 어떻게 복제할 수 있나요?
# uname -a
Linux rpi3 4.19.114-v7+ #1303 SMP Tue Apr 7 15:44:16 BST 2020 armv7l GNU/Linux
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
Subdevices: 7/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
Subdevices: 8/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 1: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
Subdevices: 7/7
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
card 1: ALSA [bcm2835 ALSA], device 1: bcm2835 IEC958/HDMI [bcm2835 IEC958/HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: ALSA [bcm2835 ALSA], device 2: bcm2835 IEC958/HDMI1 [bcm2835 IEC958/HDMI1]
Subdevices: 1/1
Subdevice #0: subdevice #0
# cat /proc/asound/cards
0 [Loopback ]: Loopback - Loopback
Loopback 1
1 [ALSA ]: bcm2835_alsa - bcm2835 ALSA
bcm2835 ALSA