libs/audiographer/audiographer/sr_converter.h

   1 #ifndef AUDIOGRAPHER_SR_CONVERTER_H
   2 #define AUDIOGRAPHER_SR_CONVERTER_H
   3
   4 #include <samplerate.h>
   5
   6 #include "debuggable.h"
   7 #include "listed_source.h"
   8 #include "sink.h"
   9 #include "throwing.h"
  10 #include "types.h"
  11
  12 namespace AudioGrapher
  13 {
  14
  15 class SampleRateConverter
  16   : public ListedSource<float>
  17   , public Sink<float>
  18   , public Debuggable<>
  19   , public Throwing<>
  20 {
  21   public:
  22         SampleRateConverter (uint32_t channels);
  23         ~SampleRateConverter ();
  24
  25         // not RT safe
  26         void init (nframes_t in_rate, nframes_t out_rate, int quality = 0);
  27
  28         // returns max amount of frames that will be output
  29         nframes_t allocate_buffers (nframes_t max_frames);
  30
  31         // could be RT safe (check libsamplerate to be sure)
  32         void process (ProcessContext<float> const & c);
  33         using Sink<float>::process;
  34
  35   private:
  36
  37         void set_end_of_input (ProcessContext<float> const & c);
  38         void reset ();
  39
  40         bool           active;
  41         uint32_t       channels;
  42         nframes_t      max_frames_in;
  43
  44         float *        leftover_data;
  45         nframes_t      leftover_frames;
  46         nframes_t      max_leftover_frames;
  47
  48         float *        data_out;
  49         nframes_t      data_out_size;
  50
  51         SRC_DATA       src_data;
  52         SRC_STATE*     src_state;
  53 };
  54
  55 } // namespace
  56
  57 #endif // AUDIOGRAPHER_SR_CONVERTER_H