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NAudio - Play mp3 from internet without FileOpenDialog?

Answer 1

A:

"http:\www.domainname.com/file.mp3"
      ↑

Does it work with // ?

Using PlayMp3FromUrl from this SO question:

PlayMp3FromUrl("http://www.domainname.com/file.mp3");

dtb 2009-08-29 18:17:25

Oh, I wrote incorrectly. The URL path IS http:// :)

Kenny Bones 2009-08-29 18:46:48

What I'm really wondering is that one I've pasted the http URL in the fileopendialog, some code somewhere must create a download stream or something. Since the filename string ends up with a path in Temporary Internet files.

Kenny Bones 2009-08-29 18:48:18

I believe `Temporary Internet Files` is the location where Internet Explorer stores its temporaray files (a.k.a. "cache").

dtb 2009-08-29 20:41:32

Yes i know, but HOW does that happen?? I can't see it happening directly during debugging. So could it be something within OpenFileDialog? A version of NAudio from 2008 included the possibility to work with URL paths, and I downloaded the most reasent one.

Kenny Bones 2009-08-29 21:05:19

Have you looked at this? http://stackoverflow.com/questions/184683/play-audio-from-a-stream-using-c

dtb 2009-08-29 21:12:06

Yup, I have. The person developing NAudio added this to the source code in 2008. But still it seems as though it's OpenFileDialog it uses to actually create the stream or something. It's weird, because the Mp3FileReader.cs has two constructors and one is for using a Stream. It just can't manage to get to use it without FileOpenDialog

Kenny Bones 2009-08-30 12:50:34

Looking at `Mp3FileReader` in revision 28568 there's no call to a FileOpenDialog. It operates on the stream directly. The other constructor just opens the file for reading using `System.IO.File.OpenRead`. OpenRead works with local files only. So maybe the functionality you're looking for is in some other class?

dtb 2009-08-30 13:03:55

Its in the AudioPlaybackForm.cs the playbutton checks to see if FileName is empty or not. If it is, it calls "toolStripButtonOpenFile_click", which opens the filedialog and sends the results to the string "fileName" and uses that. What I'm doing is exactly the same, only, my string is set via a textbox.text value. The URL is a typical http:// path.It's basically what's causing the download stream to begin I'm interested in. I can't figure out how that's happening by using step in. FileName is suddently populated with a path to Temporary Internet files.

Kenny Bones 2009-08-30 13:39:13

This seems to be a feature of the OpenFileDialog: http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/329db03d-a774-405e-aa6a-db5db2473e9a

dtb 2009-08-30 13:46:03

I'd recommend you use a WebRequest to download the file yourself or to stream it as shown in the other SO question.

dtb 2009-08-30 13:47:45

Ah, so it wasn't included in the NAudio code :) That explains a lot, I thought there was a check or something that starts the download if it was a http url :)

Kenny Bones 2009-08-30 14:21:40

Forgive me for being an absolute idiot, but how do I actually use the PlayMp3FromUrl ?If I just add it in the Mp3FileReader.cs as instructed, that portion isn't even used. It goes right to "File.OpenRead" and that gives me an error message saying that URLs aren't supported. Btw, I do think that the same functionality that was created by a user at the previous link you gave, is in the Mp3FileReader.cs now. It's just, I don't know how to make the code go there instead of opening a local file. I've updated the first post.

Kenny Bones 2009-08-30 19:59:40

Uhm, PlayMp3FromUrl is a static method. Just put it somewhere (you don't have to modify the NAudio source code for this) and invoke it with your URL. I've updated my answer. I don't see any code in Mp3FileReader that involves a WebRequest.

dtb 2009-08-30 20:24:05

Oh I see, the PlayMp3FromUrl passes the download stream further into the Mp3FileReader.cs. But I guess "WaveOut" has changed since the code PlayMp3FromUrl was written. I get an error message saying:'NAudio.Wave.WaveOut' does not contain a constructor that takes '3' arguments'This is at line "using (WaveOut waveOut = new WaveOut(0, 500, null))" I tried to just remove all of the arguments, leaving it ()), and that compiles. But the sound playback seems to start for a microsecond or something. And then everything freezes. I've tried with various arguments and none seem to work.

Kenny Bones 2009-08-30 21:37:26

Does it work if you use Mp3FileReader with a local file?

dtb 2009-08-30 22:06:54

Yes, if I just pass a local mp3 file directly to the Mp3FileReader it works as intended. But through the PlayMp3FromUrl fails with that error message. And doesn't compile

Kenny Bones 2009-08-31 06:24:15

Wouldn't it possible to mix the code from PlayMp3From URL into the Mp3FileReader somehow? Would be nice to make the audio automatically play no matter if the source is local or via web.

Kenny Bones 2009-08-31 09:28:09

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NAudio - Play mp3 from internet without FileOpenDialog?

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