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説明
After installing Octave and using the sound library in a program, I get multiple ALSA errors in the command window:
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround40
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround41
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround50
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround51
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround71
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib ../../../src/pcm/pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib ../../oss/pcm_oss.c:404:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib ../../oss/pcm_oss.c:404:(_snd_pcm_oss_open) Cannot open device /dev/dsp
ALSA lib ../../src/confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib ../../usb_stream/pcm_usb_stream.c:481:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib ../../src/confmisc.c:160:(snd_config_get_card) Invalid field card
ALSA lib ../../usb_stream/pcm_usb_stream.c:481:(_snd_pcm_usb_stream_open) Invalid card 'card'
ALSA lib ../../../src/pcm/pcm_direct.c:2049:(snd1_pcm_direct_parse_open_conf) The field ipc_gid must be a valid group (create group audio)
Alsa-lib which provides OSS compatibility is installed and I have access to the audio group
sudo dnf list alsa-lib && groups
Mise à jour et chargement des dépôts :
Dépôts chargés.
Paquets installés
alsa-lib.x86_64 1.2.13-3.fc41 updates
Paquets disponibles
alsa-lib.i686 1.2.13-3.fc41 updates
mathis wheel audio
Program is
f1 = 196; T = 5;
fs = 8e3;
N = fs * T;
n = 0 : N-1;
x = sin(2*pi*f1/fs*n);
sound(x,fs);