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Wwise SDK 2019.2.15
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 
7 Licensees holding valid commercial licenses to the AUDIOKINETIC Wwise Technology
8 may use this file in accordance with the end user license agreement provided
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10 written agreement between you and Audiokinetic Inc.
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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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24  Version: <VERSION> Build: <BUILDNUMBER>
25  Copyright (c) <COPYRIGHTYEAR> Audiokinetic Inc.
26 *******************************************************************************/
27 
28 /// \file
29 /// Software source plug-in and effect plug-in interfaces.
30 
31 #ifndef _IAK_MIXER_PLUGIN_H_
32 #define _IAK_MIXER_PLUGIN_H_
33 
34 #include <AK/SoundEngine/Common/IAkPlugin.h>
35 
36 namespace AK
37 {
38  /// Software effect plug-in interface for panner/mixer effects (see \ref soundengine_plugins_effects).
39  class IAkMixerEffectPlugin : public IAkPlugin
40  {
41  public:
42 
43  /// Software effect plug-in initialization. Prepares the effect for data processing, allocates memory and sets up the initial conditions.
44  /// \aknote Memory allocation should be done through appropriate macros (see \ref fx_memory_alloc). \endaknote
45  virtual AKRESULT Init(
46  IAkPluginMemAlloc * in_pAllocator, ///< Interface to memory allocator to be used by the effect.
47  IAkMixerPluginContext * in_pMixerPluginContext, ///< Interface to mixer plug-in's context.
48  IAkPluginParam * in_pParams, ///< Interface to plug-in parameters.
49  AkAudioFormat & in_rFormat ///< Audio data format of the requested output signal.
50  ) = 0;
51 
52  /// This function is called whenever a new input is connected to the underlying mixing bus.
53  virtual void OnInputConnected(
54  IAkMixerInputContext * in_pInput ///< Input that is being connected.
55  ) = 0;
56 
57  /// This function is called whenever a new input is disconnected to the underlying mixing bus.
58  /// \aknote OnInputDisconnected() may be called between calls to ConsumeInput() and OnMixDone().\endaknote
59  virtual void OnInputDisconnected(
60  IAkMixerInputContext * in_pInput ///< Input that is being disconnected.
61  ) = 0;
62 
63  /// This function is called whenever an input (voice or bus) needs to be mixed.
64  /// During an audio frame, ConsumeInput() will be called for each input that need to be mixed.
65  /// \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.
66  /// Mixers cannot make an input remain alive by changing their state.\endaknote
67  /// \aknote ConsumeInput() will not be called for frames during which a voice is not audible.\endaknote
68  /// \sa
69  /// - OnMixDone
70  /// - OnEffectsProcessed
71  virtual void ConsumeInput(
72  IAkMixerInputContext * in_pInputContext, ///< Context for this input. Carries non-audio data.
73  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).
74  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().
75  AkAudioBuffer * io_pInputBuffer, ///< Input audio buffer data structure. Plugins should avoid processing data in-place.
76  AkAudioBuffer * io_pMixBuffer ///< Output audio buffer data structure. Stored until call to OnEffectsProcessed().
77  ) = 0;
78 
79  /// This function is called once every audio frame, when all inputs have been mixed in
80  /// with ConsumeInput(). It is the time when the plugin may perform final DSP/bookkeeping.
81  /// After the bus buffer io_pMixBuffer has been pushed to the bus downstream (or the output device),
82  /// it is cleared out for the next frame.
83  /// \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.
84  /// 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.
85  /// 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
86  /// wait until OnEffectsProcessed() to flip the state to AK_DataReady. This is usually undesirable, so handling this inside OnMixDone() is usually preferred.\endaknote
87  /// \sa
88  /// - ConsumeInput
89  /// - OnEffectsProcessed
90  virtual void OnMixDone(
91  AkAudioBuffer * io_pMixBuffer ///< Output audio buffer data structure. Stored across calls to ConsumeInput().
92  ) = 0;
93 
94  /// This function is called once every audio frame, after all insert effects on the bus have been processed,
95  /// which occur after the post mix pass of OnMixDone().
96  /// After the bus buffer io_pMixBuffer has been pushed to the bus downstream (or the output device),
97  /// it is cleared out for the next frame.
98  /// \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.
99  /// 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.
100  /// 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
101  /// 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
102  /// \sa
103  /// - OnMixDone
104  /// - AK::IAkMetering
105  /// - AK::IAkMixerPluginContext::EnableMetering()
106  virtual void OnEffectsProcessed(
107  AkAudioBuffer * io_pMixBuffer ///< Output audio buffer data structure.
108  ) = 0;
109 
110  /// 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),
111  /// which occur after OnEffectsProcessed().
112  /// 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.
113  /// Mixer plugins may use this hook for processing the signal after it has been metered.
114  /// \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.
115  /// 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.
116  /// 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
117  /// 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
118  /// \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().
119  /// It may also be enabled by the Wwise authoring tool when connected.\endaknote
120  /// \sa
121  /// - OnMixDone
122  /// - AK::IAkMetering
123  /// - AK::IAkMixerPluginContext::EnableMetering()
124  virtual void OnFrameEnd(
125  AkAudioBuffer * io_pMixBuffer, ///< Output audio buffer data structure.
126  IAkMetering * in_pMetering ///< Interface for retrieving metering data computed on io_pMixBuffer. May be NULL if metering is not enabled.
127  ) = 0;
128  };
129 }
130 #endif // _IAK_MIXER_PLUGIN_H_
AK::IAkMixerPluginContext
Interface to retrieve contextual information for a mixer.
Definition: IAkPlugin.h:393
AK::IAkMetering
Interface to retrieve metering information about a buffer.
Definition: AkCommonDefs.h:208
AK
Audiokinetic namespace
Definition: AkWwiseSDKVersion.cs:32
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:122
AK::IAkMixerInputContext
Interface to retrieve information about an input of a mixer.
Definition: IAkPlugin.h:758
AK::IAkMixerEffectPlugin
Software effect plug-in interface for panner/mixer effects (see 如何创建 Wwise 声音引擎效果器插件).
Definition: IAkMixerPlugin.h:40
AK::IAkMixerEffectPlugin::OnEffectsProcessed
virtual void OnEffectsProcessed(AkAudioBuffer *io_pMixBuffer)=0
AK::IAkMixerEffectPlugin::OnFrameEnd
virtual void OnFrameEnd(AkAudioBuffer *io_pMixBuffer, IAkMetering *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:597
AK::IAkMixerEffectPlugin::Init
virtual AKRESULT Init(IAkPluginMemAlloc *in_pAllocator, IAkMixerPluginContext *in_pMixerPluginContext, IAkPluginParam *in_pParams, AkAudioFormat &in_rFormat)=0
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:60
AK::IAkMixerEffectPlugin::OnInputDisconnected
virtual void OnInputDisconnected(IAkMixerInputContext *in_pInput)=0

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