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Man Pages


Manual Reference Pages  -  SDL_AUDIOSPEC (3)

NAME

SDL_AudioSpec - Audio Specification Structure

CONTENTS

STRUCTURE DEFINITION

typedef struct{
  int freq;
  Uint16 format;
  Uint8 channels;
  Uint8 silence;
  Uint16 samples;
  Uint32 size;
  void (*callback)(void *userdata, Uint8 *stream, int len);
  void *userdata;
} SDL_AudioSpec;

STRUCTURE DATA

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

DESCRIPTION

The SDL_AudioSpec structure is used to describe the format of some audio data. This structure 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 common 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_U8
AUDIO_S8
AUDIO_U16 or AUDIO_U16LSB
AUDIO_S16 or AUDIO_S16LSB
AUDIO_U16MSB
AUDIO_S16MSB
AUDIO_U16SYS
AUDIO_S16SYS
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 buffer 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.

SEE ALSO

SDL_OpenAudio, SDL_LoadWAV

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SDL SDL_AUDIOSPEC (3) Tue 11 Sep 2001, 22:58

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