Develop Reference

How can I use mp3 files in Windows Phone 8?

in my windows phone gaming apps, I have to use lots of sound. Now I have seen that Windows phone does not support mp3 files. So I need to use the wav files. Any mp3 file which is just 500 kb size in mp3 format, when convert that to ".wav" it becomes min 2.5MB. It's actually eating up my apps size and unnecessarily the size of my apps is getting bigger.
Anyone know how can I use the mp3 file? In my solution I have a Asset folder and inside this folder all the ".wav" files are located.
How I am doing this let me write a code
SoundEffect effect;
Iinside constructor-
{
...
var soundFile = "Assets/Jump.wav";
Stream stream = TitleContainer.OpenStream(soundFile);
effect = SoundEffect.FromStream(stream);
And in the code
effect.Play();
Is there any better approach. In some thread I come to know that doing this is not a better way coding as it creates object and used up the system space. Please suggest what to do, how do I add mp3 files and write better code for working with sound files.

you can use BackgroundAudioPlayer to play your wav and mp3 files. SoundEffect class cannot play mp3 data
Go through this it's an entire app on it's own.
Background Audio WP

To use an MP3 file you would have to decode the MP3 into PCM in memory, and use that resulting stream in the SoundEffect.FromStream method.
Another thing you could try is encoding the wav files as ADPCM. This usually compresses the wave file at ratio of 4:1. If you can't use the stream directly, decoding of ADPCM is much more straightforward than decoding an mp3 file.
And one more thing you could try to save space is converting the uncompressed wave files into mono, and a lower sampling rate. You can perform listening tests on the sounds after the conversion to make sure that the loss in quality is acceptable or not.

Extracting and splitting a MP3 audio stream from an AVI file

I want to develop a desktop application by programming in C# and using the .Net framework 4.
The goal of my application is to extract a MP3 audio stream from a supplied AVI file.
I have learned from the Internet that an AVI file is a container and it might contain different audio streams.
If the supplied AVI file contains one MP3 audio stream at least then I want to extract it and split it.
I want to split the MP3 audio stream into MP3 audio parts identified with a start time and an end time.
I have looked on the Internet for any .Net library I could use but without success.
Does someone know what documented .Net library would be useful ?

Maybe you can try this:
Simple C# Wrapper for the AviFile Library
It is targeted at AVI video but there might be some clues as how to use the same methods to extract the audio only.
Either use it as-is or use the example to incorporate what you need into your own code.

Since tools for this task already exist, I see no point in creating another one unless you're curious about how to do this yourself and learn something new.
If so, using a ready-made library would defeat the entire idea of learning something which is why I strongly recommend you try implementing the splitter yourself.
You can find descriptions of the AVI file format online, that should get you started.

Create an mp3 file from scratch C#

As part of some experimentation, I thought of something, how can I create a .mp3 file from scratch in C#, that actually sounds like something, e.g, create an mp3 file that plays the note: C#, or B flat?
How can I achieve this, and it must be an mp3 file, not a wav, or anything else.

So I'm not going to be able to give you exact code, but I can give a starting point.
So basically the steps would be
Find the frequency of the wave you want. Look at this. C# (nice choice by the way!) is 17.32HZ
Convert the frequency to LPCM, which is just a series of amplitude values.
Convert the LPCM encoded array to an MP3 file. This is probably the hardest, but LPCM forms that basis of the WAV format and there are converters to convert that to MP3. Have a look at the NAudio baalazamon found. It supports PCM.

I would try using NAudio it's quite powerful. The main purpose was to manipulate audio files but it's worth to try.

Windows Forms dotnet .wav playback - need to preload multiple wav files to memory for fast playback

I need to play back 30 second audio clips, 1 per second, in winforms dotnet.
I am currently loading/playing the wav files from the filesystem, which works fine on a notebook, but is causing problems on a netbook. Can I pre-load all sound files into memory, if so how?

If you use the SoundPlayer to play your files you can preload the file with SoundPlayer.Load.
SoundPlayer sp = new SoundPlayer("filename");
sp.Load(); // preload
sp.Play();
Edit:
As noted by the documentation you may also use SoundPlayer.LoadAsync to load the sound in the background.

I'm inclined to say that you would load the file into a system.io.memorystream of some sort. Hopefully the libraries that play your file, will take a memorystream or memorystream can be converted into the data structure that this library takes.

Here's a recent example that creates a .wav file (a sine) in memory entirely from scratch and plays it. What you're trying to do should be much simpler, and you should be able to derive it from the sample posted.
Real low level sound generation in C#?

How do I split an mp3 file into smaller files?

I want to make a program that takes an MP3 file and breaks it into many smaller mp3 files based on 1-2 seconds of no sound (silence).
What is the easiest way to do this in c#?

Bass library. Bass has everything you need. It can access, record and edit media streams like mp3s, allowing you to sample the volume at different time points. It has a .net api, so you can use it in c#. Unfortunately it does cost money if you are using it for a commercial application, but they do provide a free non-commercial license.
Sox is a command-line tool which has an option to split an mp3 on n seconds of silence. You could always use the system command to call sox from c#.
Other related links.
Ripping a CD to mp3 in C# - third party component or api out there?
Audio Libraries for MP3 editing
How do I merge/join mp3 files with c#
This code shows a way to make a CD
ripper in C#. There are APIs from some
vendors that allow reading audio CD
tracks but it is also possible to do
it using APIs that allow low level
access to CD drives such as ASPI from
Adaptec or IOCTL control codes. The
latter method is used in this case,
because there is no need to install
any third party software, it is
completely covered by Win32 API
functions.
http://www.codeproject.com/KB/cs/csharpripper.aspx

Splitting the MP3 stream will be difficult to do with any degree of precision. The compressed MP3 data exists as sequential chunks of audio data comprised of many samples. The easiest way to perform this would be to decode the stream either progressively or in its entirety, perform your manipulation, then re-encode it (which as I understand is how most jukebox software does it)

Having a solid knowledge of the file's binary format would be a good place to start. That done, you'll know what silence looks like in the file. You may have to define exactly what silence is. Presuming that, like most audio, it started from an analog source, there's almost certainly some noise buried in the "silence". What will your tolerance for ambient/background noise be?
Once you know what you're looking for, just scan through the file, looking for "it".
Simple ...

A program to do this already exists:
http://mp3splt.sourceforge.net/mp3splt_page/home.php