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SDL_OpenAudio
https://www.libsdl.org/release/SDL-1.2.15/docs/html/sdlopenaudio.html
The audio device starts out playing silence when it's opened, and should be enabled for playing by calling SDL_PauseAudio(0) when you are ready for your audio callback function to be called. Since the audio driver may modify the requested size of the audio buffer, you should allocate any local mixing buffers after you open the audio device.
man SDL_OpenAudio (3): Opens the audio device with the ...
https://manpages.org/sdl_openaudio/3
To open the audio device a desired SDL_AudioSpec must be created. SDL_AudioSpec *desired; . . desired=(SDL_AudioSpec *)malloc(sizeof(SDL_AudioSpec)); You must then fill this structure with your desired audio specifications. desired->freq desired->format desired->samples desired->callback. void callback(void *userdata, Uint8 *stream, int len);
c - SDL audio call back not working? - Stack Overflow
https://stackoverflow.com/questions/19226627/sdl-audio-call-back-not-working
1. If you never open the actual audio output device with SDL_OpenAudio(), then there isn't anything actually trying to playaudio, so of course there's nothing that calls your buffer-filling callback. If opening the audio device fails, then that's a problem you need to solve.
Audio Examples - Simple DirectMedia Layer
https://www.libsdl.org/release/SDL-1.2.15/docs/html/guideaudioexamples.html
SDL_AudioSpec wanted; extern void fill_audio (void *udata, Uint8 *stream, int len); /* Set the audio format */ wanted.freq = 22050; wanted.format = AUDIO_S16; wanted.channels = 2; /* 1 = mono, 2 = stereo */ wanted.samples = 1024; /* Good low-latency value for callback */ wanted.callback = fill_audio; wanted.userdata = NULL; /* Open the audio device, forcing the desired format */ if ( …
SDL :: View topic - SDL_QueueAudio()....
https://forums.libsdl.org/viewtopic.php?p=44610
Open the audio device like you normally would, but specify a NULL callback (this would previously cause SDL_OpenAudio*() to fail unconditionally). Then you may call: Â Â SDL_QueueAudio(myDeviceId, myAudioData, numberOfBytes); Queue as much or little as you want, SDL will drain it to the audio device as necessary. If you provide too little, SDL will feed …
Play a sound with SDL2 (no SDL_Mixer) · GitHub
https://gist.github.com/armornick/3447121
// set the callback function: wav_spec. callback = my_audio_callback; wav_spec. userdata = NULL; // set our global static variables: audio_pos = wav_buffer; // copy sound buffer: audio_len = wav_length; // copy file length /* Open the audio device */ if ( SDL_OpenAudio (&wav_spec, NULL) < 0){fprintf (stderr, " Couldn't open audio: %s \n ", SDL_GetError ()); exit (-1);}
SDL_PauseAudio - SDL Wiki
https://wiki.libsdl.org/SDL_PauseAudio
Remarks. New programs might want to use SDL_PauseAudioDevice () instead. This function is equivalent to calling... SDL_PauseAudioDevice (1, pause_on); ...and is only useful if you used the legacy SDL_OpenAudio () function.
sdl_openaudio(3) - Linux man page
https://linux.die.net/man/3/sdl_openaudio
To open the audio device a desired SDL_AudioSpec must be created. CWSDL_AudioSpec *desired; . . desired=(SDL_AudioSpec *)malloc(sizeof(SDL_AudioSpec)); You must then fill this structure with your desired audio specifications. desired->freq desired->format desired->samples desired->callback CWvoid callback(void *userdata, Uint8 *stream, int len);
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