SDL_AudioSpec - Audio Specification Structure

       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_U8AUDIO_S8AUDIO_U16 or AUDIO_U16LSBAUDIO_S16 or AUDIO_S16LSBAUDIO_U16MSBAUDIO_S16MSBAUDIO_U16SYSAUDIO_S16SYSchannels            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_LoadWAVsamples is set to
                           4096.

       SDL_AudioSpec - Audio Specification Structure

SDL_OpenAudio, SDL_LoadWAV

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

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

       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;