指向原生函数（提供了对音频样本帧的访问）的指针。
此函数指针可以传递给需要使用样本帧的原生插件，从而避免从原生转向 C# 的相关开销或者出现垃圾收集干扰问题。
导入使用此类型的原生函数，将原生函数指针传递给原生插件，如下所示：
SetConsumeSampleFramesFunction(
AudioSampleProvider.consumeSampleFramesNativeFunction, signalProvider.id,
signalProvider.channelCount, signalProvider.sampleRate);
要了解如何导入使用此签名的原生函数，请参阅 ConsumeSampleFramesNativeFunction。
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