Comments on: Encoding uncompressed audio with FLAC in C#

by: ac3 filter

Fri, 03 Sep 2010 00:58:48 +0000

thanks for this piece of info i have a blog on regarding this ones.I Should admit you managed more cooler then me

by: codefire

Tue, 27 Jul 2010 13:12:29 +0000

Plz look at the link I have pasted into “website” address.
It’s a 7zip file I have sent through “yousendit”.

That 7zip is a test-project I have made, re-using open-source code.

It can encore wav to flac and decode flac to wav, with a really good ratio.

I succeed to re-used existing code, but to be honest i’m quite lost about that libflac code and its API :-s

So, I wish it will help you to have good ratio compression, for single and multi channels, as well as different bit rates.

I am still trying to have c# code, to manage wav to flac encoding and flac to wav decoding, with such a good ratio.

And also, important for my need, it should be able to work with stream.

Thanks in advance for your help.

by: Stanimir Stoyanov

Mon, 26 Jul 2010 13:10:53 +0000

@codefire I have posted on the blog an article on FLAC decoding and have updated the original code. I am, however, still looking into the compression ratio issue.

by: codefire

Fri, 23 Jul 2010 09:47:40 +0000

I have also difficulties to make an application which encode/decode signals which have only 1 channel.

I can’t find an open source code which work for X number of channel or X bits per samples

by: codefire

Fri, 23 Jul 2010 08:42:19 +0000

Thanks for you reply.

When you’ll fix it; could you please also show me how to decode from flac to wav ?

Because I have tried using open source codes, but have found nothing which works nice.

Thanks

by: Stanimir Stoyanov

Tue, 20 Jul 2010 12:26:11 +0000

@hanan Displaying the wave graph is as simple as taking the current amplitude value (preferably as a floating-point number in the range of [-1.0; 1.0]) and displaying it in some way. Here’s an example of how to convert a WORD/ushort value from byte[] to float:

ushort v; float f; // 'ushort' because amplitudes are unsigned
byte[] a;

v = 32768; // Test with half of the maximum amplitude
a = BitConverter.GetBytes(v); // Same as the 'b' array in your comment
f = BitConverter.ToUInt16(a, 0) / (float)ushort.MaxValue; // Result is 0.5

@codefire I will check this again, thanks, and update the post adequately.

by: codefire

Tue, 20 Jul 2010 11:37:37 +0000

Hi,

I have the same remark about result FLAC files which are lot bigger that the ones I generated using Flac-Fronted application.

I really need to manage wav to flac conversion into my C# .NET application,

I don’t know how to achieve such a good ratio.

Thanks in advance for replies and help.

by: hanan

Tue, 01 Jun 2010 15:24:51 +0000

Hello,
Thanks on the great code. I am using it to read WAV file and I am trying to display the wave on a graph. I have taken the buffer i have problem to convert it to value that I can display on graph. do you have an idea on how to display it?
I tried to convert from unsigned byte to int but without success.

public static int unsignedShortToInt(byte[] b)
{
int i = 0;
i |= b[0] & 0xFF;
i

by: Nicolai Dvinge

Tue, 09 Feb 2010 07:52:22 +0000

Thanks for sharing this nicely written code.
However, when compressing waves to flac using your code, the Flac files are very big (only like 5 % compressionrate), compared to using the standard Flac commandline encoder. Do you have any idea how to achieve the same level of compression using your stream-based encoding?

by: Alex

Thu, 04 Feb 2010 12:12:51 +0000

Simply a great article!

For many months I tried to find a solution, thanks!