libs/audiographer/audiographer/general/peak_reader.h

   1 #ifndef AUDIOGRAPHER_PEAK_READER_H
   2 #define AUDIOGRAPHER_PEAK_READER_H
   3
   4 #include "audiographer/sink.h"
   5 #include "audiographer/routines.h"
   6 #include "audiographer/utils/listed_source.h"
   7
   8 namespace AudioGrapher
   9 {
  10
  11 /// A class that reads the maximum value from a stream
  12 class PeakReader : public ListedSource<float>, public Sink<float>
  13 {
  14   public:
  15         /// Constructor \n RT safe
  16         PeakReader() : peak (0.0) {}
  17
  18         /// Returns the highest absolute of the values found so far. \n RT safe
  19         float get_peak() { return peak; }
  20
  21         /// Resets the peak to 0 \n RT safe
  22         void  reset() { peak = 0.0; }
  23
  24         /// Finds peaks from the data \n RT safe
  25         void process (ProcessContext<float> const & c)
  26         {
  27                 peak = Routines::compute_peak (c.data(), c.frames(), peak);
  28                 ListedSource<float>::output(c);
  29         }
  30
  31         using Sink<float>::process;
  32
  33   private:
  34         float peak;
  35 };
  36
  37
  38 } // namespace
  39
  40 #endif // AUDIOGRAPHER_PEAK_READER_H