如何捕获波形输出PCM数据 [英] How to capture PCM data from Wave Out

问题描述

如何将有可能以编程方式捕获音频？我实现，在实时流在网络上的桌面的应用程序。视频部分已完成。我需要实现音频部分。我需要一种方法来从声卡得到PCM数据喂到我的EN codeR（实现使用Windows Media格式）。

How would it be possible to capture the audio programmatically? I am implementing an application that streams in real time the desktop on the network. The video part is finished. I need to implement the audio part. I need a way to get PCM data from the sound card to feed to my encoder (implemented using Windows Media Format).

我认为答案是关系到openMixer（），waveInOpen（）在Win32 API函数，但我不知道到底该怎么办。

I think the answer is related to the openMixer(), waveInOpen() functions in Win32 API, but I am not sure exactly what should I do.

如何打开必要的渠道和如何从中读取PCM数据？

How to open the necessary channel and how to read PCM data from it?

先谢谢了。

推荐答案

我不认为这是一个直接的方式做到这一点使用的操作系统 - 这是一个功能，该功能可能（也可能不会）是present上声卡。有些声卡有一个loopback接口 - 创意称之为什么ü听到的声音。您只需选择这个作为使用正常waveInOpen（）输入，而不是麦克风，并记录从中，你已经知道了。

I don't think there is a direct way to do this using the OS - it's a feature that may (or may not) be present on the sound card. Some sound cards have a loopback interface - Creative calls it "What U Hear". You simply select this as the input rather than the microphone, and record from it using the normal waveInOpen() that you already know about.

如果声卡没有这种功能，那么我想你了不是做一些疯狂的喜欢做自己的驱动程序等运气。或者你可以说服你的用户运行从扬声器输出电缆线路输入：）

If the sound card doesn't have this feature then I think you're out of luck other than by doing something crazy like making your own driver. Or you could convince your users to run a cable from the speaker output to the line input :)

这篇关于如何捕获波形输出PCM数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！