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trying to assign callback variable with SDL for audio
https://stackoverflow.com/questions/61842282/trying-to-assign-callback-variable-with-sdl-for-audio
The SDL callback signature is a stand-alone function of type void (*)(void* userdata, Uint8* stream, int len).. Your callback signature is close but not quite a match: void (mainEngineCW4::*)(void* userdata, Uint8* stream, int len). The main difference is that it is a member function, which is part of its type. In short, that type -- member function -- implies that …
SDL_AudioSpec - SDL Wiki - Simple DirectMedia Layer
https://wiki.libsdl.org/SDL_AudioSpec
void SDL_AudioCallback (void* userdata, Uint8* stream, int len) where its parameters are: Once the callback returns, the buffer will no longer be valid. Stereo samples are stored in a LRLRLR ordering. The callback must completely initialize the buffer; as of SDL 2.0, this buffer is not initialized before the callback is called.
Play a sound with SDL2 (no SDL_Mixer) · GitHub
https://gist.github.com/armornick/3447121
#include < SDL2/SDL.h > # define MUS_PATH " Roland-GR-1-Trumpet-C5.wav " // prototype for our audio callback // see the implementation for more information void my_audio_callback (void *userdata, Uint8 *stream, int len); // variable declarations static Uint8 *audio_pos; // global pointer to the audio buffer to be played: static Uint32 audio_len; // remaining length of the sample we …
Audio Examples - Simple DirectMedia Layer
https://www.libsdl.org/release/SDL-1.2.15/docs/html/guideaudioexamples.html
Opening the audio device. SDL_AudioSpec wanted; extern void fill_audio(void *udata, Uint8 *stream, int len); /* Set the audio format */ wanted.freq = 22050; wanted ...
SDL_QueueAudio - SDL Wiki - Simple DirectMedia Layer
https://wiki.libsdl.org/SDL_QueueAudio
SDL offers two ways to feed audio to the device: you can either supply a callback that SDL triggers with some frequency to obtain more audio (pull method), or you can supply no callback, and then SDL will expect you to supply data at regular intervals (push method) with this function.
SDL_OpenAudio - SDL Wiki - Simple DirectMedia Layer
https://wiki.libsdl.org/SDL_OpenAudio
The Simple Directmedia Layer Wiki. SDL Wiki. SDL_OpenAudio. This function is a legacy means of opening the audio device. Syntax. ... If obtained is NULL, the audio data passed to the callback function will be guaranteed to be in the requested format, ...
SDL audio callback buffer size - General and Gameplay ...
https://www.gamedev.net/forums/topic/655986-sdl-audio-callback-buffer-size/
SDL audio is not very straightforward, but I think I've got it working pretty much the way I've wanted, except this problem with the low rate of callback. I hope to be able to fix it, or at least find out why I can't do it.
C++: SDL audio callback eventually stops working - Johnnn
https://johnnn.tech/q/c-sdl-audio-callback-eventually-stops-working/
Pausing-Unpausing doesn’t seem to help. The program keeps going, even without callbacks. At the start, there are a few callbacks without any getAudio calls between them. Note: I already know this question is similar to SDL audio callback stops after two iterations but in my case I am recording audio, and the number of callbacks isn’t fixed.
SDL_OpenAudioDevice - SDL Wiki
https://wiki.libsdl.org/SDL_OpenAudioDevice
An opened audio device starts out paused, and should be enabled for playing by calling SDL_PauseAudioDevice (devid, 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.
SDL_LockAudioDevice - SDL Wiki - Simple DirectMedia Layer
https://wiki.libsdl.org/SDL_LockAudioDevice
SDL_LockAudioDevice Use this function to lock out the audio callback function for a specified device. Syntax void SDL_LockAudioDevice (SDL_AudioDeviceID dev); Function Parameters dev the ID of the device to be locked Remarks The lock manipulated by these functions protects the audio callback function specified in SDL_OpenAudioDevice ().
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