ALSA: Couldn’t open audio device: No such device

1.查看环境变量: export ，确认 SDL_AUDIODRIVER没有设置为alsa
2.export SDL_AUDIODRIVER=alsa
3.export AUDIODEV=pulse
4.export SDL_AUDIODRIVER=alsa 设置SDL声音驱动:ALSA export AUDIODEV=pulse 设置audiodev为脉冲

If you built your own SDL, you probably didn't have development headers 

for PulseAudio (or ALSA), so it's trying to use /dev/dsp, which doesn't 

exist on many modern Linux systems (hence, SDL_Init(SDL_INIT_AUDIO) 

succeeds, but no devices are found when you try to open one). "apt-get 

install libasound2-dev libpulse-dev" and rebuild SDL...let the configure 

script find the new headers so it includes PulseAudio and ALSA support. 

If you didn't build your own SDL, maybe you can force it to use a 

different audio path: 

SDL_AUDIODRIVER=pulse ./mytestprogram 

or 

SDL_AUDIODRIVER=alsa ./mytestprogram 

 One of those two solutions will (probably) fix your problem.