_i_ak_mixer_plugin_8h

Wwise SDK 2018.1.11
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 /// \file 

 /// Software source plug-in and effect plug-in interfaces.

 #ifndef _IAK_MIXER_PLUGIN_H_

 #define _IAK_MIXER_PLUGIN_H_

 #include <AK/SoundEngine/Common/IAkPlugin.h>

 namespace AK

 {

     /// Software effect plug-in interface for panner/mixer effects (see \ref soundengine_plugins_effects).

     class IAkMixerEffectPlugin : public IAkPlugin

     {

     public:

         /// Software effect plug-in initialization. Prepares the effect for data processing, allocates memory and sets up the initial conditions. 

         /// \aknote Memory allocation should be done through appropriate macros (see \ref fx_memory_alloc). \endaknote

         virtual AKRESULT Init( 

             IAkPluginMemAlloc *         in_pAllocator,              ///< Interface to memory allocator to be used by the effect.

             IAkMixerPluginContext *     in_pMixerPluginContext,     ///< Interface to mixer plug-in's context.

             IAkPluginParam *            in_pParams,                 ///< Interface to plug-in parameters.

             AkAudioFormat &             in_rFormat                  ///< Audio data format of the requested output signal.

             ) = 0;

         /// This function is called whenever a new input is connected to the underlying mixing bus.

         virtual void OnInputConnected( 

             IAkMixerInputContext * in_pInput            ///< Input that is being connected.

             ) = 0;

         /// This function is called whenever a new input is disconnected to the underlying mixing bus.

         /// \aknote OnInputDisconnected() may be called between calls to ConsumeInput() and OnMixDone().\endaknote

         virtual void OnInputDisconnected( 

             IAkMixerInputContext * in_pInput            ///< Input that is being disconnected.

             ) = 0;

         /// This function is called whenever an input (voice or bus) needs to be mixed.

         /// During an audio frame, ConsumeInput() will be called for each input that need to be mixed.

         /// \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.

         /// Mixers cannot make an input remain alive by changing their state.\endaknote

         /// \aknote ConsumeInput() will not be called for frames during which a voice is not audible.\endaknote

         /// \sa

         /// - OnMixDone

         /// - OnEffectsProcessed

         virtual void ConsumeInput( 

             IAkMixerInputContext *  in_pInputContext,   ///< Context for this input. Carries non-audio data.

             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).

             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().

             AkAudioBuffer *         io_pInputBuffer,    ///< Input audio buffer data structure. Plugins should avoid processing data in-place.

             AkAudioBuffer *         io_pMixBuffer       ///< Output audio buffer data structure. Stored until call to OnEffectsProcessed().

             ) = 0;

         /// This function is called once every audio frame, when all inputs have been mixed in 

         /// with ConsumeInput(). It is the time when the plugin may perform final DSP/bookkeeping.

         /// 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.

         /// \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.

         /// 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.

         /// 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

         /// wait until OnEffectsProcessed() to flip the state to AK_DataReady. This is usually undesirable, so handling this inside OnMixDone() is usually preferred.\endaknote

         /// \sa

         /// - ConsumeInput

         /// - OnEffectsProcessed

         virtual void OnMixDone( 

             AkAudioBuffer *         io_pMixBuffer       ///< Output audio buffer data structure. Stored across calls to ConsumeInput().

             ) = 0;

         /// This function is called once every audio frame, after all insert effects on the bus have been processed, 

         /// which occur after the post mix pass of OnMixDone().

         /// 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.

         /// \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.

         /// 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.

         /// 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

         /// 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

         /// \sa

         /// - OnMixDone

         /// - AK::IAkMetering

         /// - AK::IAkMixerPluginContext::EnableMetering()

         virtual void OnEffectsProcessed( 

             AkAudioBuffer *         io_pMixBuffer       ///< Output audio buffer data structure.

             ) = 0;

         /// 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),

         /// which occur after OnEffectsProcessed().

         /// 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.

         /// Mixer plugins may use this hook for processing the signal after it has been metered.

         /// \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.

         /// 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.

         /// 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

         /// 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

         /// \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().

         /// It may also be enabled by the Wwise authoring tool when connected.\endaknote

         /// \sa

         /// - OnMixDone

         /// - AK::IAkMetering

         /// - AK::IAkMixerPluginContext::EnableMetering()

         virtual void OnFrameEnd(

             AkAudioBuffer *         io_pMixBuffer,      ///< Output audio buffer data structure.

             IAkMetering *           in_pMetering        ///< Interface for retrieving metering data computed on io_pMixBuffer. May be NULL if metering is not enabled.

             ) = 0;

     };

 }

 #endif // _IAK_MIXER_PLUGIN_H_
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