如果此属性为 true，且可用数据量少于请求数据量，则在静音时填充 ConsumeSampleFrames 生成的缓冲区。否则，缓冲区中的额外样本帧将保持不变。
如果未进行静音填充，AudioSampleProvider.ConsumeSampleFrames 将使用可用样本帧，返回传递的缓冲区中被实际写入的样本帧数量，而缓冲区的其余部分保持不变。
启用静音填充后，如果没有足够的可用样本帧，该方法将完全填充传入的缓冲区并在需要时提供静音。
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