libs/audiographer/audiographer/general/sr_converter.h

   1 #ifndef AUDIOGRAPHER_SR_CONVERTER_H
   2 #define AUDIOGRAPHER_SR_CONVERTER_H
   3
   4 #include <samplerate.h>
   5
   6 #include "audiographer/flag_debuggable.h"
   7 #include "audiographer/sink.h"
   8 #include "audiographer/throwing.h"
   9 #include "audiographer/types.h"
  10 #include "audiographer/utils/listed_source.h"
  11
  12 namespace AudioGrapher
  13 {
  14
  15 /// Samplerate converter
  16 class SampleRateConverter
  17   : public ListedSource<float>
  18   , public Sink<float>
  19   , public FlagDebuggable<>
  20   , public Throwing<>
  21 {
  22   public:
  23         /// Constructor. \n RT safe
  24         SampleRateConverter (uint32_t channels);
  25         ~SampleRateConverter ();
  26
  27         /// Init converter \n Not RT safe
  28         void init (nframes_t in_rate, nframes_t out_rate, int quality = 0);
  29
  30         /// Returns max amount of frames that will be output \n RT safe
  31         nframes_t allocate_buffers (nframes_t max_frames);
  32
  33         /** Does sample rate conversion.
  34           * Note that outpt size may vary a lot.
  35           * May or may not output several contexts of data.
  36           * \n Should be RT safe.
  37           * \TODO Check RT safety from libsamplerate
  38           */
  39         void process (ProcessContext<float> const & c);
  40         using Sink<float>::process;
  41
  42   private:
  43
  44         void set_end_of_input (ProcessContext<float> const & c);
  45         void reset ();
  46
  47         bool           active;
  48         uint32_t       channels;
  49         nframes_t      max_frames_in;
  50
  51         float *        leftover_data;
  52         nframes_t      leftover_frames;
  53         nframes_t      max_leftover_frames;
  54
  55         float *        data_out;
  56         nframes_t      data_out_size;
  57
  58         SRC_DATA       src_data;
  59         SRC_STATE*     src_state;
  60 };
  61
  62 } // namespace
  63
  64 #endif // AUDIOGRAPHER_SR_CONVERTER_H