/*
- Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
#ifndef DCPOMATIC_AUDIO_FILTER_H
#define DCPOMATIC_AUDIO_FILTER_H
-#include <boost/shared_ptr.hpp>
+
+#include <memory>
+#include <vector>
+
class AudioBuffers;
struct audio_filter_impulse_input_test;
+
/** An audio filter which can take AudioBuffers and apply some filtering operation,
* returning filtered samples
*/
class AudioFilter
{
public:
- AudioFilter (float transition_bandwidth)
- : _ir (0)
+ explicit AudioFilter (float transition_bandwidth)
{
_M = 4 / transition_bandwidth;
if (_M % 2) {
}
}
- virtual ~AudioFilter ();
+ virtual ~AudioFilter () {}
- boost::shared_ptr<AudioBuffers> run (boost::shared_ptr<const AudioBuffers> in);
+ std::shared_ptr<AudioBuffers> run (std::shared_ptr<const AudioBuffers> in);
void flush ();
friend struct audio_filter_impulse_kernel_test;
friend struct audio_filter_impulse_input_test;
- float* sinc_blackman (float cutoff, bool invert) const;
+ std::vector<float> sinc_blackman (float cutoff, bool invert) const;
- float* _ir;
+ std::vector<float> _ir;
int _M;
- boost::shared_ptr<AudioBuffers> _tail;
+ std::shared_ptr<AudioBuffers> _tail;
};
+
class LowPassAudioFilter : public AudioFilter
{
public:
LowPassAudioFilter (float transition_bandwidth, float cutoff);
};
+
class HighPassAudioFilter : public AudioFilter
{
public:
HighPassAudioFilter (float transition_bandwidth, float cutoff);
};
+
class BandPassAudioFilter : public AudioFilter
{
public:
BandPassAudioFilter (float transition_bandwidth, float lower, float higher);
};
+
#endif