# include/AK/SoundEngine/Common/IAkMixerPlugin.h

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00014 Alternatively, this file may be used under the Apache License, Version 2.0 (the
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00027
00028 /// \file
00029 /// Software source plug-in and effect plug-in interfaces.
00030
00031 #ifndef _IAK_MIXER_PLUGIN_H_
00032 #define _IAK_MIXER_PLUGIN_H_
00033
00034 #include <AK/SoundEngine/Common/IAkPlugin.h>
00035
00036 namespace AK
00037 {
00038     /// Software effect plug-in interface for panner/mixer effects (see \ref soundengine_plugins_effects).
00039     class IAkMixerEffectPlugin : public IAkPlugin
00040     {
00041     public:
00042
00043         /// Software effect plug-in initialization. Prepares the effect for data processing, allocates memory and sets up the initial conditions.
00044         /// \aknote Memory allocation should be done through appropriate macros (see \ref fx_memory_alloc). \endaknote
00045         virtual AKRESULT Init(
00046             IAkPluginMemAlloc *         in_pAllocator,              ///< Interface to memory allocator to be used by the effect.
00047             IAkMixerPluginContext *     in_pMixerPluginContext,     ///< Interface to mixer plug-in's context.
00048             IAkPluginParam *            in_pParams,                 ///< Interface to plug-in parameters.
00049             AkAudioFormat &             in_rFormat                  ///< Audio data format of the requested output signal.
00050             ) = 0;
00051
00052         /// This function is called whenever a new input is connected to the underlying mixing bus.
00053         virtual void OnInputConnected(
00054             IAkMixerInputContext * in_pInput            ///< Input that is being connected.
00055             ) = 0;
00056
00057         /// This function is called whenever a new input is disconnected to the underlying mixing bus.
00058         /// \aknote OnInputDisconnected() may be called between calls to ConsumeInput() and OnMixDone().\endaknote
00059         virtual void OnInputDisconnected(
00060             IAkMixerInputContext * in_pInput            ///< Input that is being disconnected.
00061             ) = 0;
00062
00063         /// This function is called whenever an input (voice or bus) needs to be mixed.
00064         /// During an audio frame, ConsumeInput() will be called for each input that need to be mixed.
00065         /// \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.
00066         /// Mixers cannot make an input remain alive by changing their state.\endaknote
00067         /// \aknote ConsumeInput() will not be called for frames during which a voice is not audible.\endaknote
00068         /// \sa
00069         /// - OnMixDone
00070         /// - OnEffectsProcessed
00071         virtual void ConsumeInput(
00072             IAkMixerInputContext *  in_pInputContext,   ///< Context for this input. Carries non-audio data.
00073             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).
00074             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().
00075             AkAudioBuffer *         io_pInputBuffer,    ///< Input audio buffer data structure. Plugins should avoid processing data in-place.
00076             AkAudioBuffer *         io_pMixBuffer       ///< Output audio buffer data structure. Stored until call to OnEffectsProcessed().
00077             ) = 0;
00078
00079         /// This function is called once every audio frame, when all inputs have been mixed in
00080         /// with ConsumeInput(). It is the time when the plugin may perform final DSP/bookkeeping.
00081         /// After the bus buffer io_pMixBuffer has been pushed to the bus downstream (or the output device),
00082         /// it is cleared out for the next frame.
00083         /// \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.
00084         /// 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.
00085         /// 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
00086         /// wait until OnEffectsProcessed() to flip the state to AK_DataReady. This is usually undesirable, so handling this inside OnMixDone() is usually preferred.\endaknote
00087         /// \sa
00088         /// - ConsumeInput
00089         /// - OnEffectsProcessed
00090         virtual void OnMixDone(
00091             AkAudioBuffer *         io_pMixBuffer       ///< Output audio buffer data structure. Stored across calls to ConsumeInput().
00092             ) = 0;
00093
00094         /// This function is called once every audio frame, after all insert effects on the bus have been processed,
00095         /// which occur after the post mix pass of OnMixDone().
00096         /// After the bus buffer io_pMixBuffer has been pushed to the bus downstream (or the output device),
00097         /// it is cleared out for the next frame.
00098         /// \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.
00099         /// 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.
00100         /// 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
00101         /// 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
00102         /// \sa
00103         /// - OnMixDone
00104         /// - AK::IAkMetering
00105         /// - AK::IAkMixerPluginContext::EnableMetering()
00106         virtual void OnEffectsProcessed(
00107             AkAudioBuffer *         io_pMixBuffer       ///< Output audio buffer data structure.
00108             ) = 0;
00109
00110         /// 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),
00111         /// which occur after OnEffectsProcessed().
00112         /// 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.
00113         /// Mixer plugins may use this hook for processing the signal after it has been metered.
00114         /// \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.
00115         /// 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.
00116         /// 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
00117         /// 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
00118         /// \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().
00119         /// It may also be enabled by the Wwise authoring tool when connected.\endaknote
00120         /// \sa
00121         /// - OnMixDone
00122         /// - AK::IAkMetering
00123         /// - AK::IAkMixerPluginContext::EnableMetering()
00124         virtual void OnFrameEnd(
00125             AkAudioBuffer *         io_pMixBuffer,      ///< Output audio buffer data structure.
00126             IAkMetering *           in_pMetering        ///< Interface for retrieving metering data computed on io_pMixBuffer. May be NULL if metering is not enabled.
00127             ) = 0;
00128     };
00129 }
00130 #endif // _IAK_MIXER_PLUGIN_H_