The audio interface is used to control sound hardware, if equipped.
struct player_audio_data :
The audio interface reads the audio stream from /dev/audio (which
is assumed to be associated with a sound card connected to a microphone)
and performs some analysis on it. Five frequency/amplitude pairs are then
returned as data; the format is:
| uint16_t frequency0, amplitude0; |
Hz, db ?
| uint16_t frequency1, amplitude1; |
Hz, db ?
| uint16_t frequency2, amplitude2; |
Hz, db ?
| uint16_t frequency3, amplitude3; |
Hz, db ?
| uint16_t frequency4, amplitude4; |
Hz, db ?
struct player_audio_cmd : The audio interface accepts commands to produce fixed-frequency
tones through /dev/dsp (which is assumed to be associated with
a sound card to which a speaker is attached); the format is:
| uint16_t frequency; |
Frequency to play (Hz?)
| uint16_t amplitude; |
Amplitude to play (dB?)
| uint16_t duration; |
Duration to play (sec?)