libs/audiographer/audiographer/routines.h

   1 #ifndef AUDIOGRAPHER_ROUTINES_H
   2 #define AUDIOGRAPHER_ROUTINES_H
   3
   4 #include "types.h"
   5
   6 #include <cmath>
   7
   8 namespace AudioGrapher
   9 {
  10
  11 class Routines
  12 {
  13   public:
  14         typedef float (*compute_peak_t)          (float const *, nframes_t, float);
  15         typedef void  (*apply_gain_to_buffer_t)  (float *, nframes_t, float);
  16
  17         static void override_compute_peak         (compute_peak_t func)         { _compute_peak = func; }
  18         static void override_apply_gain_to_buffer (apply_gain_to_buffer_t func) { _apply_gain_to_buffer = func; }
  19
  20         static inline float compute_peak (float const * data, nframes_t frames, float current_peak)
  21         {
  22                 return (*_compute_peak) (data, frames, current_peak);
  23         }
  24
  25         static inline void apply_gain_to_buffer (float * data, nframes_t frames, float gain)
  26         {
  27                 (*_apply_gain_to_buffer) (data, frames, gain);
  28         }
  29
  30   private:
  31         static inline float default_compute_peak (float const * data, nframes_t frames, float current_peak)
  32         {
  33                 for (nframes_t i = 0; i < frames; ++i) {
  34                         float abs = std::fabs(data[i]);
  35                         if (abs > current_peak) { current_peak = abs; }
  36                 }
  37                 return current_peak;
  38         }
  39
  40         static inline void default_apply_gain_to_buffer (float * data, nframes_t frames, float gain)
  41         {
  42                 for (nframes_t i = 0; i < frames; ++i) {
  43                         data[i] *= gain;
  44                 }
  45         }
  46
  47         static compute_peak_t          _compute_peak;
  48         static apply_gain_to_buffer_t  _apply_gain_to_buffer;
  49 };
  50
  51 } // namespace
  52
  53 #endif // AUDIOGRAPHER_ROUTINES_H