OpenShot Library | libopenshot  0.2.7
ParametricEQ.h
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1 /**
2  * @file
3  * @brief Header file for Parametric EQ audio effect class
4  * @author
5  *
6  * @ref License
7  */
8 
9 /* LICENSE
10  *
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12  * <http://www.openshotstudios.com/>. This file is part of
13  * OpenShot Library (libopenshot), an open-source project dedicated to
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15  * world. For more information visit <http://www.openshot.org/>.
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17  * OpenShot Library (libopenshot) is free software: you can redistribute it
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21  *
22  * OpenShot Library (libopenshot) is distributed in the hope that it will be
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25  * GNU Lesser General Public License for more details.
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30 
31 #ifndef OPENSHOT_PARAMETRIC_EQ_AUDIO_EFFECT_H
32 #define OPENSHOT_PARAMETRIC_EQ_AUDIO_EFFECT_H
33 #define _USE_MATH_DEFINES
34 
35 #include "../EffectBase.h"
36 
37 #include "../Frame.h"
38 #include "../Json.h"
39 #include "../KeyFrame.h"
40 #include "../Enums.h"
41 
42 #include <memory>
43 #include <string>
44 #include <math.h>
45 // #include <OpenShotAudio.h>
46 
47 
48 namespace openshot
49 {
50 
51  /**
52  * @brief This class adds a equalization into the audio
53  *
54  */
55  class ParametricEQ : public EffectBase
56  {
57  private:
58  /// Init effect settings
59  void init_effect_details();
60 
61  public:
67 
68  /// Blank constructor, useful when using Json to load the effect properties
69  ParametricEQ();
70 
71  /// Default constructor
72  ///
73  /// @param new_level
74  ParametricEQ(openshot::FilterType new_filter_type, Keyframe new_frequency, Keyframe new_gain, Keyframe new_q_factor);
75 
76  /// @brief This method is required for all derived classes of ClipBase, and returns a
77  /// new openshot::Frame object. All Clip keyframes and effects are resolved into
78  /// pixels.
79  ///
80  /// @returns A new openshot::Frame object
81  /// @param frame_number The frame number (starting at 1) of the clip or effect on the timeline.
82  std::shared_ptr<openshot::Frame> GetFrame(int64_t frame_number) override {
83  return GetFrame(std::make_shared<openshot::Frame>(), frame_number);
84  }
85 
86  /// @brief This method is required for all derived classes of ClipBase, and returns a
87  /// modified openshot::Frame object
88  ///
89  /// The frame object is passed into this method and used as a starting point (pixels and audio).
90  /// All Clip keyframes and effects are resolved into pixels.
91  ///
92  /// @returns The modified openshot::Frame object
93  /// @param frame The frame object that needs the clip or effect applied to it
94  /// @param frame_number The frame number (starting at 1) of the clip or effect on the timeline.
95  std::shared_ptr<openshot::Frame> GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number) override;
96 
97  // Get and Set JSON methods
98  std::string Json() const override; ///< Generate JSON string of this object
99  void SetJson(const std::string value) override; ///< Load JSON string into this object
100  Json::Value JsonValue() const override; ///< Generate Json::Value for this object
101  void SetJsonValue(const Json::Value root) override; ///< Load Json::Value into this object
102 
103  /// Get all properties for a specific frame (perfect for a UI to display the current state
104  /// of all properties at any time)
105  std::string PropertiesJSON(int64_t requested_frame) const override;
106 
107  class Filter : public IIRFilter
108  {
109  public:
110  void updateCoefficients (const double discrete_frequency,
111  const double q_factor,
112  const double gain,
113  const int filter_type);
114  };
115 
116  juce::OwnedArray<Filter> filters;
117 
118  void updateFilters(int64_t frame_number, double sample_rate);
119  };
120 
121 }
122 
123 #endif
This abstract class is the base class, used by all effects in libopenshot.
Definition: EffectBase.h:70
void updateFilters(int64_t frame_number, double sample_rate)
void SetJsonValue(const Json::Value root) override
Load Json::Value into this object.
void SetJson(const std::string value) override
Load JSON string into this object.
FilterType
This enumeration determines the filter type of ParametricEQ Effect.
Definition: Enums.h:96
std::string PropertiesJSON(int64_t requested_frame) const override
Json::Value JsonValue() const override
Generate Json::Value for this object.
juce::OwnedArray< Filter > filters
Definition: ParametricEQ.h:116
ParametricEQ()
Blank constructor, useful when using Json to load the effect properties.
This namespace is the default namespace for all code in the openshot library.
Definition: Compressor.h:46
This class adds a equalization into the audio.
Definition: ParametricEQ.h:55
openshot::FilterType filter_type
Definition: ParametricEQ.h:62
A Keyframe is a collection of Point instances, which is used to vary a number or property over time...
Definition: KeyFrame.h:72
std::string Json() const override
Generate JSON string of this object.
std::shared_ptr< openshot::Frame > GetFrame(int64_t frame_number) override
This method is required for all derived classes of ClipBase, and returns a new openshot::Frame object...
Definition: ParametricEQ.h:82
void updateCoefficients(const double discrete_frequency, const double q_factor, const double gain, const int filter_type)