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 #define routines_nframes_t uint32_t
   9
  10 namespace AudioGrapher
  11 {
  12
  13 class Routines
  14 {
  15   public:
  16         typedef float (*compute_peak_t)          (float const *, routines_nframes_t, float);
  17         typedef void  (*apply_gain_to_buffer_t)  (float *, routines_nframes_t, float);
  18
  19         static void override_compute_peak         (compute_peak_t func)         { _compute_peak = func; }
  20         static void override_apply_gain_to_buffer (apply_gain_to_buffer_t func) { _apply_gain_to_buffer = func; }
  21
  22         static inline float compute_peak (float const * data, routines_nframes_t frames, float current_peak)
  23         {
  24                 return (*_compute_peak) (data, frames, current_peak);
  25         }
  26
  27         static inline void apply_gain_to_buffer (float * data, routines_nframes_t frames, float gain)
  28         {
  29                 (*_apply_gain_to_buffer) (data, frames, gain);
  30         }
  31
  32   private:
  33         static inline float default_compute_peak (float const * data, routines_nframes_t frames, float current_peak)
  34         {
  35                 for (routines_nframes_t i = 0; i < frames; ++i) {
  36                         float abs = std::fabs(data[i]);
  37                         if (abs > current_peak) { current_peak = abs; }
  38                 }
  39                 return current_peak;
  40         }
  41
  42         static inline void default_apply_gain_to_buffer (float * data, routines_nframes_t frames, float gain)
  43         {
  44                 for (routines_nframes_t i = 0; i < frames; ++i) {
  45                         data[i] *= gain;
  46                 }
  47         }
  48
  49         static compute_peak_t          _compute_peak;
  50         static apply_gain_to_buffer_t  _apply_gain_to_buffer;
  51 };
  52
  53 } // namespace
  54
  55 #undef routines_nframes_t
  56
  57 #endif // AUDIOGRAPHER_ROUTINES_H