Comments (3)
slouken
commented on June 3, 2024
Do you know what effect changing the configuration in /etc/asound.conf has? Are you able to debug into SDL and find out why it's failing?
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rtomasa
commented on June 3, 2024
The effect of modifying /etc/asound.conf is limited to setting the default sound card. By default, Linux designates headphones as the default sound card (index 0). The configuration I've provided above is intended for establishing the first HDMI as the default sound card. This ensures that it is also the one automatically selected by SDL when passing the NULL value.
With that said, I'm curious about the differences in SDL's behavior when allowing it to choose the default card versus explicitly passing the name. If you have any suggestions for debugging this issue, I would appreciate it. I ran out of ideas.
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rtomasa
commented on June 3, 2024
In case it helps, this is the output of my aplay -L:
null
Discard all samples (playback) or generate zero samples (capture)
default
Default Audio Device
sysdefault
Default Audio Device
hw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac, HifiBerry DAC HiFi pcm5102a-hifi-0
Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac, HifiBerry DAC HiFi pcm5102a-hifi-0
Hardware device with all software conversions
default:CARD=sndrpihifiberry
snd_rpi_hifiberry_dac, HifiBerry DAC HiFi pcm5102a-hifi-0
Default Audio Device
sysdefault:CARD=sndrpihifiberry
snd_rpi_hifiberry_dac, HifiBerry DAC HiFi pcm5102a-hifi-0
Default Audio Device
dmix:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac, HifiBerry DAC HiFi pcm5102a-hifi-0
Direct sample mixing device
hw:CARD=vc4hdmi0,DEV=0
vc4-hdmi-0, MAI PCM i2s-hifi-0
Direct hardware device without any conversions
plughw:CARD=vc4hdmi0,DEV=0
vc4-hdmi-0, MAI PCM i2s-hifi-0
Hardware device with all software conversions
default:CARD=vc4hdmi0
vc4-hdmi-0, MAI PCM i2s-hifi-0
Default Audio Device
sysdefault:CARD=vc4hdmi0
vc4-hdmi-0, MAI PCM i2s-hifi-0
Default Audio Device
hdmi:CARD=vc4hdmi0,DEV=0
vc4-hdmi-0, MAI PCM i2s-hifi-0
HDMI Audio Output
dmix:CARD=vc4hdmi0,DEV=0
vc4-hdmi-0, MAI PCM i2s-hifi-0
Direct sample mixing device
hw:CARD=vc4hdmi1,DEV=0
vc4-hdmi-1, MAI PCM i2s-hifi-0
Direct hardware device without any conversions
plughw:CARD=vc4hdmi1,DEV=0
vc4-hdmi-1, MAI PCM i2s-hifi-0
Hardware device with all software conversions
default:CARD=vc4hdmi1
vc4-hdmi-1, MAI PCM i2s-hifi-0
Default Audio Device
sysdefault:CARD=vc4hdmi1
vc4-hdmi-1, MAI PCM i2s-hifi-0
Default Audio Device
hdmi:CARD=vc4hdmi1,DEV=0
vc4-hdmi-1, MAI PCM i2s-hifi-0
HDMI Audio Output
dmix:CARD=vc4hdmi1,DEV=0
vc4-hdmi-1, MAI PCM i2s-hifi-0
Direct sample mixing device
And these are the testing results for hdmi0:
aplay -D default /usr/share/sounds/alsa/Noise.wav plays OK
aplay -D sysdefault /usr/share/sounds/alsa/Noise.wav plays OK
aplay -D default:CARD=vc4hdmi0 /usr/share/sounds/alsa/Noise.wav plays OK
aplay -D sysdefault:CARD=vc4hdmi0 /usr/share/sounds/alsa/Noise.wav plays OK
aplay -D hw:CARD=vc4hdmi0,DEV=0 /usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1343: Sample format non available
Available formats:
- IEC958_SUBFRAME_LE
aplay -D plughw:CARD=vc4hdmi0,DEV=0 /usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1343: Sample format non available
Available formats:
- IEC958_SUBFRAME_LE
aplay -D hdmi:CARD=vc4hdmi0,DEV=0 /usr/share/sounds/alsa/Noise.wav
Playing WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
aplay: set_params:1349: Channels count non available
aplay -D dmix:CARD=vc4hdmi0,DEV=0 /usr/share/sounds/alsa/Noise.wav
ALSA lib pcm_direct.c:1206:(snd1_pcm_direct_initialize_slave) requested or auto-format is not available
ALSA lib pcm_dmix.c:1087:(snd_pcm_dmix_open) unable to initialize slave
aplay: main:830: audio open error: Invalid argument
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