Saya ingin RasPi saya mengirim audio ke port audio out board saya, dan juga ke kartu Digital out saya (I2S Hifiberry Digi). Ini seharusnya dimungkinkan dengan ALSA. Saya memiliki driver yang dimuat dan dapat mengirim ke kedua perangkat suara secara terpisah, tetapi menggabungkannya tidak berfungsi. Ada beberapa pos di luar sana yang menjelaskan cara melakukan ini, tetapi konfigurasi saya tidak bisa berfungsi.
Kesalahan dari aplay:
Playing WAVE 'sin1000_48khz.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
ALSA lib pcm_params.c:2162:(snd1_pcm_hw_refine_slave) Slave PCM not usable
aplay: set_params:1059: Broken configuration for this PCM: no configurations available
Output dari "aplay -l"
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_digi], device 0: HifiBerry Digi HiFi wm8804-spdif-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
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 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
Output dari "aplay -L"
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=sndrpihifiberry
snd_rpi_hifiberry_digi,
Default Audio Device
sysdefault:CARD=ALSA
bcm2835 ALSA, bcm2835 ALSA
Default Audio Device`
Isi dari /etc/asound.conf
pcm.both {
type route
slave.pcm {
type multi
slaves.a.pcm "hw:0,0"
slaves.b.pcm "hw:1,0"
slaves.a.channels 2
slaves.b.channels 2
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
}
ctl.both {
type hw
card sndrpihifiberry
device 0
}
pcm.hifiberry {
type hw
card sndrpihifiberry
device 0
}
ctl.hifiberry {
type hw
card sndrpihifiberry
device 0
}
pcm.audioout {
type hw
card ALSA
device 0
}
ctl.audioout {
type hw
card ALSA
device 0
}
pcm.!default {
type plug
slave {
pcm both
}
}
#pcm.!default {
# type hw
# card sndrpihifiberry
# device 0
#}
ctl.!default {
type hw
card sndrpihifiberry
device 0
}