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Wwise SDK 2022.1.19
IAkMixerPlugin.h
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1 /*******************************************************************************
2 The content of this file includes portions of the AUDIOKINETIC Wwise Technology
3 released in source code form as part of the SDK installer package.
4 
5 Commercial License Usage
6 
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8 may use this file in accordance with the end user license agreement provided
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12 Apache License Usage
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14 Alternatively, this file may be used under the Apache License, Version 2.0 (the
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26 
27 /// \file
28 /// Software source plug-in and effect plug-in interfaces.
29 
30 #ifndef _IAK_MIXER_PLUGIN_H_
31 #define _IAK_MIXER_PLUGIN_H_
32 
33 #include <AK/SoundEngine/Common/IAkPlugin.h>
34 
35 namespace AK
36 {
37  /// Software effect plug-in interface for panner/mixer effects (see \ref soundengine_plugins_effects).
38  class IAkMixerEffectPlugin : public IAkPlugin
39  {
40  public:
41 
42  /// Software effect plug-in initialization. Prepares the effect for data processing, allocates memory and sets up the initial conditions.
43  /// \aknote Memory allocation should be done through appropriate macros (see \ref fx_memory_alloc). \endaknote
44  virtual AKRESULT Init(
45  IAkPluginMemAlloc * in_pAllocator, ///< Interface to memory allocator to be used by the effect.
46  IAkMixerPluginContext * in_pMixerPluginContext, ///< Interface to mixer plug-in's context.
47  IAkPluginParam * in_pParams, ///< Interface to plug-in parameters.
48  AkAudioFormat & in_rFormat ///< Audio data format of the requested output signal.
49  ) = 0;
50 
51  /// This function is called whenever a new input is connected to the underlying mixing bus.
52  virtual void OnInputConnected(
53  IAkMixerInputContext * in_pInput ///< Input that is being connected.
54  ) = 0;
55 
56  /// This function is called whenever a new input is disconnected to the underlying mixing bus.
57  /// \aknote OnInputDisconnected() may be called between calls to ConsumeInput() and OnMixDone().\endaknote
58  virtual void OnInputDisconnected(
59  IAkMixerInputContext * in_pInput ///< Input that is being disconnected.
60  ) = 0;
61 
62  /// This function is called whenever an input (voice or bus) needs to be mixed.
63  /// During an audio frame, ConsumeInput() will be called for each input that need to be mixed.
64  /// \aknote io_pInputBuffer->eState will be set as AK_NoMoreData the last time the given input is processed by ConsumeInput(). Otherwise it is set to AK_DataReady.
65  /// Mixers cannot make an input remain alive by changing their state.\endaknote
66  /// \aknote ConsumeInput() will not be called for frames during which a voice is not audible.\endaknote
67  /// \sa
68  /// - OnMixDone
69  /// - OnEffectsProcessed
70  virtual void ConsumeInput(
71  IAkMixerInputContext * in_pInputContext, ///< Context for this input. Carries non-audio data.
72  AkRamp in_baseVolume, ///< Base volume to apply to this input (prev corresponds to the beginning, next corresponds to the end of the buffer). This gain is agnostic of emitter-listener pair-specific contributions (such as distance level attenuation).
73  AkRamp in_emitListVolume, ///< Emitter-listener pair-specific gain. When there are multiple emitter-listener pairs, this volume equals 1, and pair gains are applied directly on the channel volume matrix (accessible via IAkMixerInputContext::GetSpatializedVolumes()). For custom processing of emitter-listener pairs, one should query each pair volume using IAkMixerInputContext::Get3DPosition(), then AkEmitterListenerPair::GetGainForConnectionType().
74  AkAudioBuffer * io_pInputBuffer, ///< Input audio buffer data structure. Plugins should avoid processing data in-place.
75  AkAudioBuffer * io_pMixBuffer ///< Output audio buffer data structure. Stored until call to OnEffectsProcessed().
76  ) = 0;
77 
78  /// This function is called once every audio frame, when all inputs have been mixed in
79  /// with ConsumeInput(). It is the time when the plugin may perform final DSP/bookkeeping.
80  /// After the bus buffer io_pMixBuffer has been pushed to the bus downstream (or the output device),
81  /// it is cleared out for the next frame.
82  /// \aknote io_pMixBuffer->eState is passed as AK_DataReady for the whole existence of the bus, until the last frame where it will be set to AK_NoMoreData.
83  /// However, mixer plugins are capable of forcing the bus to remain alive for a longer time by changing io_pMixBuffer->eState back to AK_DataReady.
84  /// You may do this in OnMixDone() or in OnEffectsProcessed(). The difference is that effects inserted on the bus will enter their "tail mode" if you
85  /// wait until OnEffectsProcessed() to flip the state to AK_DataReady. This is usually undesirable, so handling this inside OnMixDone() is usually preferred.\endaknote
86  /// \sa
87  /// - ConsumeInput
88  /// - OnEffectsProcessed
89  virtual void OnMixDone(
90  AkAudioBuffer * io_pMixBuffer ///< Output audio buffer data structure. Stored across calls to ConsumeInput().
91  ) = 0;
92 
93  /// This function is called once every audio frame, after all insert effects on the bus have been processed,
94  /// which occur after the post mix pass of OnMixDone().
95  /// After the bus buffer io_pMixBuffer has been pushed to the bus downstream (or the output device),
96  /// it is cleared out for the next frame.
97  /// \aknote io_pMixBuffer->eState is passed as AK_DataReady for the whole existence of the bus, until the last frame where it will be set to AK_NoMoreData.
98  /// However, mixer plugins are capable of forcing the bus to remain alive for a longer time by changing io_pMixBuffer->eState back to AK_DataReady.
99  /// You may do this in OnMixDone(), in OnEffectsProcessed() or in OnFrameEnd(). The difference is that effects inserted on the bus will enter their "tail mode" if you
100  /// wait until OnEffectsProcessed() or OnFrameEnd() to flip the state to AK_DataReady. This is usually undesirable, so handling this inside OnMixDone() is usually preferred.\endaknote
101  /// \sa
102  /// - OnMixDone
103  /// - AK::AkMetering
104  /// - AK::IAkMixerPluginContext::EnableMetering()
105  virtual void OnEffectsProcessed(
106  AkAudioBuffer * io_pMixBuffer ///< Output audio buffer data structure.
107  ) = 0;
108 
109  /// This function is called once every audio frame, after all insert effects on the bus have been processed, and after metering has been processed (if applicable),
110  /// which occur after OnEffectsProcessed().
111  /// After the bus buffer io_pMixBuffer has been pushed to the bus downstream (or the output device), it is cleared out for the next frame.
112  /// Mixer plugins may use this hook for processing the signal after it has been metered.
113  /// \aknote io_pMixBuffer->eState is passed as AK_DataReady for the whole existence of the bus, until the last frame where it will be set to AK_NoMoreData.
114  /// However, mixer plugins are capable of forcing the bus to remain alive for a longer time by changing io_pMixBuffer->eState back to AK_DataReady.
115  /// You may do this in OnMixDone(), in OnEffectsProcessed() or in OnFrameEnd(). The difference is that effects inserted on the bus will enter their "tail mode" if you
116  /// wait until OnEffectsProcessed() or OnFrameEnd() to flip the state to AK_DataReady. This is usually undesirable, so handling this inside OnMixDone() is usually preferred.\endaknote
117  /// \aknote This function is called after metering gets computed on io_pMixBuffer. You may access the result in in_pMetering. Metering has to be enabled with AK::IAkMixerPluginContext::EnableMetering().
118  /// It may also be enabled by the Wwise authoring tool when connected.\endaknote
119  /// \sa
120  /// - OnMixDone
121  /// - AK::AkMetering
122  /// - AK::IAkMixerPluginContext::EnableMetering()
123  virtual void OnFrameEnd(
124  AkAudioBuffer * io_pMixBuffer, ///< Output audio buffer data structure.
125  AkMetering * in_pMetering ///< Struct containing metering data computed on io_pMixBuffer. May be NULL if metering is not enabled.
126  ) = 0;
127  };
128 }
129 #endif // _IAK_MIXER_PLUGIN_H_
AK::IAkMixerPluginContext
Interface to retrieve contextual information for a mixer.
Definition: IAkPlugin.h:442
AK
Audiokinetic namespace
Definition: AkWwiseSDKVersion.cs:31
AK::IAkMixerEffectPlugin::ConsumeInput
virtual void ConsumeInput(IAkMixerInputContext *in_pInputContext, AkRamp in_baseVolume, AkRamp in_emitListVolume, AkAudioBuffer *io_pInputBuffer, AkAudioBuffer *io_pMixBuffer)=0
AKRESULT
AKRESULT
Standard function call result.
Definition: AkTypes.h:199
AK::IAkMixerEffectPlugin
Software effect plug-in interface for panner/mixer effects (see Creating Sound Engine Effect Plug-ins...
Definition: IAkMixerPlugin.h:39
AK::IAkMixerEffectPlugin::OnEffectsProcessed
virtual void OnEffectsProcessed(AkAudioBuffer *io_pMixBuffer)=0
AK::IAkMixerEffectPlugin::OnFrameEnd
virtual void OnFrameEnd(AkAudioBuffer *io_pMixBuffer, AkMetering *in_pMetering)=0
AK::IAkMixerEffectPlugin::OnMixDone
virtual void OnMixDone(AkAudioBuffer *io_pMixBuffer)=0
AkRamp
Volume ramp specified by end points "previous" and "next".
Definition: AkTypes.h:944
AK::IAkMixerEffectPlugin::Init
virtual AKRESULT Init(IAkPluginMemAlloc *in_pAllocator, IAkMixerPluginContext *in_pMixerPluginContext, IAkPluginParam *in_pParams, AkAudioFormat &in_rFormat)=0
AK::AkMetering
Struct containing metering information about a buffer. Depending on when this struct is generated,...
Definition: AkCommonDefs.h:203
AK::IAkMixerEffectPlugin::OnInputConnected
virtual void OnInputConnected(IAkMixerInputContext *in_pInput)=0
This function is called whenever a new input is connected to the underlying mixing bus.
AkAudioFormat
Defines the parameters of an audio buffer format.
Definition: AkCommonDefs.h:62
AK::IAkMixerEffectPlugin::OnInputDisconnected
virtual void OnInputDisconnected(IAkMixerInputContext *in_pInput)=0

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