Mercurial > sdl-ios-xcode
diff include/SDL_audio.h @ 2656:dd74182b3c3c gsoc2008_audio_resampling
Began implementing IIR and FIR filters, and got zero stuffing and sample discarding working.
| author | Aaron Wishnick <schnarf@gmail.com> |
|---|---|
| date | Wed, 18 Jun 2008 18:55:50 +0000 |
| parents | b8e736c8a5a8 |
| children |
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--- a/include/SDL_audio.h Wed Jun 18 04:51:10 2008 +0000 +++ b/include/SDL_audio.h Wed Jun 18 18:55:50 2008 +0000 @@ -142,8 +142,8 @@ SDL_AudioFormat dst_format; /* Target audio format */ double rate_incr; /* Rate conversion increment */ Uint8 *buf; /* Buffer to hold entire audio data */ - Uint8 *sinc; /* Windowed sinc filter */ - Uint8 *state_buf; /* Sample history for either the FIR or IIR filter */ + Uint8 *coeff; /* Filter coefficients: either big windowed sinc filter, or 6 IIR lowpass coefficients*/ + Uint8 *state_buf; /* Sample history for either the FIR or IIR filter. For IIR filter, first two elements are X, second two are Y, and state_pos toggles the order */ int state_pos; /* Position in the state */ int len_sinc; /* Length of windowed sinc filter, in appropriate units (not necessarily bytes) */ int len; /* Length of original audio buffer */