Mercurial > sdl-ios-xcode
comparison include/SDL_audio.h @ 3021:f3dcf04412cf
First shot at new audio resampling code.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 11 Jan 2009 04:46:42 +0000 |
| parents | e532417a6977 |
| children | d3baf5ac4e37 |
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| 3020:70d876a0b90e | 3021:f3dcf04412cf |
|---|---|
| 145 int needed; /* Set to 1 if conversion possible */ | 145 int needed; /* Set to 1 if conversion possible */ |
| 146 SDL_AudioFormat src_format; /* Source audio format */ | 146 SDL_AudioFormat src_format; /* Source audio format */ |
| 147 SDL_AudioFormat dst_format; /* Target audio format */ | 147 SDL_AudioFormat dst_format; /* Target audio format */ |
| 148 double rate_incr; /* Rate conversion increment */ | 148 double rate_incr; /* Rate conversion increment */ |
| 149 Uint8 *buf; /* Buffer to hold entire audio data */ | 149 Uint8 *buf; /* Buffer to hold entire audio data */ |
| 150 Uint8 *coeff; /* Filter coefficients: either big windowed sinc filter, or 6 IIR lowpass coefficients */ | |
| 151 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 */ | |
| 152 int state_pos; /* Position in the state */ | |
| 153 int len_sinc; /* Length of windowed sinc filter, in appropriate units (not necessarily bytes) */ | |
| 154 int len; /* Length of original audio buffer */ | 150 int len; /* Length of original audio buffer */ |
| 155 int len_cvt; /* Length of converted audio buffer */ | 151 int len_cvt; /* Length of converted audio buffer */ |
| 156 int len_mult; /* buffer must be len*len_mult big */ | 152 int len_mult; /* buffer must be len*len_mult big */ |
| 157 int len_div; /* destination length = len_mult / len_div * src length */ | 153 double len_ratio; /* Given len, final size is len*len_ratio */ |
| 158 double len_ratio; /* Given len, final size is len*len_ratio ( len_ratio = len_mult / len_div ) */ | |
| 159 SDL_AudioFilter filters[10]; /* Filter list */ | 154 SDL_AudioFilter filters[10]; /* Filter list */ |
| 160 int filter_index; /* Current audio conversion function */ | 155 int filter_index; /* Current audio conversion function */ |
| 161 } SDL_AudioCVT; | 156 } SDL_AudioCVT; |
| 162 | 157 |
| 163 | 158 |