demo_noise.h

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#ifndef AUDIOGRAPHER_DEMO_NOISE_H
#define AUDIOGRAPHER_DEMO_NOISE_H
 
#include "audiographer/visibility.h"
#include "audiographer/sink.h"
#include "audiographer/types.h"
#include "audiographer/utils/listed_source.h"
 
namespace AudioGrapher
{
 
class LIBAUDIOGRAPHER_API DemoNoiseAdder
  : public ListedSource<float>
  , public Sink<float>
  , public Throwing<>
{
public:
        DemoNoiseAdder (unsigned int channels);
        ~DemoNoiseAdder ();
 
        void init (samplecnt_t max_samples, samplecnt_t interval, samplecnt_t duration, float level);
 
        void process (ProcessContext<float> const& ctx);
        using Sink<float>::process;
 
private:
        float*       _data_out;
        samplecnt_t  _data_out_size;
 
        unsigned int _channels;
        samplecnt_t  _interval;
        samplecnt_t  _duration;
        float        _level;
        samplecnt_t  _pos;
 
        /* Park-Miller-Carta */
        uint32_t randi ();
        float    randf () { return (randi () / 1073741824.f) - 1.f; }
        uint32_t _rseed;
};
 
} // namespace
 
#endif