如何发挥非PCM文件或将其转换为PCM上飞？ [英] How to play non-PCM file or convert it to PCM on the fly ?

问题描述

以下code可以与一些wav文件，但与其他人我得到InvalidOperationException异常是未处理。消息=声音API只支持播放PCM波形文件。

The following code works with some wav files, but with others I get, "InvalidOperationException was unhandled. Message=Sound API only supports playing PCM wave files."

var webClient = new WebClient();
webClient.DownloadFile(url, fileName);
var fileSound = new SoundPlayer(fileName);
fileSound.PlaySync();

有没有一种方法以编程方式检查是否WAV文件是坏（不是PCM波形文件），然后根据需要将其转换？

Is there a way to programmatically check if a wav file is "bad" (not a PCM wave file) and then convert it as necessary?

什么是奇怪的是，code。在传统的Delphi应用程序的工作原理 - 所有的wav文件中发挥就好了。这里的德尔福code：

What is odd is that the code works in the legacy Delphi app - all of the wav files play just fine. Here's the Delphi code:

filename := GetEnvironmentVariable('TEMP')+'\archieAndDingbat.wav';
URLDownloadToFile(nil, PChar(url), PChar(filename), 0, nil);
PlaySound(filename);

我看着在资源管理器中两个文件的属性，我看到有，确实有差别。对于不播放该文件，它的音频格式为PCM;不会玩的是CCITT U-法。

I looked at the properties of the two files in Explorer, and I see that there is, indeed, a difference. For the file that does play, its audio format is PCM; the one that won't play is CCITT u-Law.

所以...我要么需要一种方法来从CCITT U-法转换为PCM动态下载这些文件后（他们是从网址下载并本地播放）或播放这些文件或许比以不同的方式PlaySync（）...

So...I either need a way to convert from CCITT u-Law to PCM on the fly after downloading these files (they are download from an url and then played locally) OR perhaps a different way of playing these files than PlaySync() ...

推荐答案

要做到这一点的方法是使用newkie的code。在<一个href=\"http://www.$c$cproject.com/Articles/175030/PlaySound-A-Better-Way-to-Play-Wav-Files-in-C?msg=4366037#xx4366037xx\" rel=\"nofollow\">http://www.$c$cproject.com/Articles/175030/PlaySound-A-Better-Way-to-Play-Wav-Files-in-C?msg=4366037#xx4366037xx

The way to do it is to use newkie's code at: http://www.codeproject.com/Articles/175030/PlaySound-A-Better-Way-to-Play-Wav-Files-in-C?msg=4366037#xx4366037xx

在我的情况下，至少，我只好全部小写字母x的而改变为大写X的，不过，要得到它的工作。

In my case, at least, I had to change all of the lowercase x's to uppercase x's, though, to get it to work.

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