libs/audiographer/audiographer/general/peak_reader.h

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