Creating a wav file after processing the samples saved into textfile

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I am developing an application in Vb.net in which I take a 16-bit mono wav file and I am using two buttons. The first button is for reading the wav file (including its header values and samples). The header values are being read in text-boxes (that I have placed on my form) and the sample values are being written (in their integer form as positive and negative values) in a textfile. Basically my Textfile works as a database for wav samples. The second button is for writing a new wav file, which will be the same as original (since, at this point I am not processing the sample values).
The problem is that I am not getting how to write the code for my second button. Any help or suggestions would be most appreciated. Thanks in advance.

Posted 22-May-12 18:16pm

Member 8244358

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**Zoltán Zörgő** · Answer 1 · 2012-05-22T18:49:00

Solution 1

You have everything you need in this artice: Concatenating Wave Files Using C# 2005[^]. You just have to fill the stream with your sample data from the text file instead.

Posted 22-May-12 18:49pm

Zoltán Zörgő

Comments

Member 8244358 23-May-12 2:11am

thanks, i am already doing that. Do i need to convert the samples into little endian format? if yes, then how can i accomplish that?

Zoltán Zörgő 23-May-12 12:08pm

Yes, you need little endian format. You can use this:
byte[] INT2LE(int data)
{
byte[] b = new byte[4];
b[0] = (byte)data;
b[1] = (byte)(((uint)data >> 8) & 0xFF);
b[2] = (byte)(((uint)data >> 16) & 0xFF);
b[3] = (byte)(((uint)data >> 24) & 0xFF);
return b;
}

https://ccrma.stanford.edu/courses/422/projects/WaveFormat/

Member 8244358 24-May-12 6:07am

ok..i'll give it a try then.

Zoltán Zörgő 27-May-12 13:33pm

Any progress?

Member 8244358 28-May-12 12:40pm

actually i got a new idea where i m converting array of Short values into a byte array, and then writing these byte values into a memory stream. The final wav file can be created using the memory stream. :)
But I appreciate your suggestion. it was of great help too. thanks a lot.

Member 8244358 28-May-12 12:47pm

I have another question as well. Now I am applying a window function on selected samples of the wav file but in this case i don't know how many samples will be modified at the run time (this is how my processing goes)! Right now, I am modifying these samples in a loop and using a list (of short) to add each modified sample. Then i am converting list into array of short and then byte array and again memory stream and this is how i get to create a new wav file. I want to know whether i am doing the things right? If not, is there any other solution of this problem? Thanks in advance!!

Zoltán Zörgő 29-May-12 5:38am

Well, generally this is not a task for managed code. Try to omit the list, and conversion in general. It is a huge overhead. Of course it looks easy to code, but you loos performance. In many cases this conversion is actually a reinterpretation if the same data, but the managed code will do a lot of memory intensive operations for nothing.
If possible to do the actual processing in unmanaged code.

Member 8244358 29-May-12 13:03pm

actually it is what my project is all about! i have to modify the samples of wav and create a new file using those samples.

Member 8244358 29-May-12 13:03pm

and these conversions made me do the project in a much simpler and faster way.