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SDL_AudioSpec(3) SDL API Reference SDL_AudioSpec(3)
SDL_AudioSpec - Audio Specification Structure
void (*callback)(void *userdata, Uint8 *stream, int len);
freq Audio frequency in samples per second
format Audio data format
channels Number of channels: 1 mono, 2 stereo
silence Audio buffer silence value (calculated)
samples Audio buffer size in samples
size Audio buffer size in bytes (calculated)
callback(..) Callback function for filling the audio buffer
userdata Pointer the user data which is passed to the callback function
The SDL_AudioSpec structure is used to describe the format of some audio data. This struc-
ture is used by SDL_OpenAudio and SDL_LoadWAV. While all fields are used by SDL_OpenAudio
only freq, format, samples and channels are used by SDL_LoadWAV. We will detail these com-
mon members here.
freq The number of samples sent to the sound device every second. Common
values are 11025, 22050 and 44100. The higher the better.
format Specifies the size and type of each sample element
AUDIO_U16 or AUDIO_U16LSB
AUDIO_S16 or AUDIO_S16LSB
channels The number of seperate sound channels. 1 is mono (single channel), 2
is stereo (dual channel).
samples When used with SDL_OpenAudio this refers to the size of the audio buf-
fer in samples. A sample a chunk of audio data of the size specified
in format mulitplied by the number of channels. When the SDL_AudioSpec
is used with SDL_LoadWAV samples is set to 4096.
SDL Tue 11 Sep 2001, 22:58 SDL_AudioSpec(3)
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