SDL2 can not initialize sound driver

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|Distributor ID:|Ubuntu| |Description:|Ubuntu 21.04| |Release:|21.04| |Codename:|hirsute|

I tried to initialize the sound driver but it didn't work. Here's the code:

std::cout << SDL_GetNumAudioDrivers() << std::endl;

for (int i = 0; i < SDL_GetNumAudioDrivers(); ++i) {
  const char* driver_name = SDL_GetAudioDriver(i);
  if (SDL_AudioInit(driver_name)) {
    printf(“Audio driver failed to initialize: %s\n”, driver_name);
    printf(“Audio driver initialize success: %s\n”, driver_name);

gave the conclusion:

Audio driver failed to initialize: dsp
Audio driver initialize success: disk
Audio driver initialize success: dummy

First, it's strange that SDL2 doesn't see pulseaudio. Secondly, even with successful initialization of the dummy and disk drivers, I do not hear any sounds.

have any idea why this is happening?

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