09-07-2013
There is a huge learning curve, so gimme a little time...
I have a fetish for Oscilloscopes, Signal Sources, Logic Analysers and RF Test Gear
and I will attempt an Arbitrary LF Function Generator first, maybe dual channel, say
20Hz to 10KHz.
I am wondering if, say, the Samsung Galaxy SIII has the same Audio I/O as the single
pole MBP 13" Audio I/O.
Everything HAS to be able to be bulit and understood by 8 to 10 year olds and
I have to assume that kids don't have access to any gear at all so calibration will br tricky.
Whatever I do I will give it all away as usual as CC0 licence, (Public Domain).
Now to attempt my first "Hello World." this weekend... ;oD
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LEARN ABOUT DEBIAN
sdl_audiospec
SDL_AudioSpec(3) SDL API Reference SDL_AudioSpec(3)
NAME
SDL_AudioSpec - Audio Specification Structure
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 sam-
ples is set to 4096.
SEE ALSO
SDL_OpenAudio, SDL_LoadWAV
SDL
Tue 11 Sep 2001, 22:58 SDL_AudioSpec(3)