topic Re: reading an mp3 audio file? (not McadPrime3) in Mathcad

reading an mp3 audio file? (not McadPrime3)

ptc-1398121 — Sun, 04 Mar 2018 02:21:41 GMT

Is there a way to read an mp3 file into Mathcad? I don't mean a Mathcad Prime 3 file, but I do mean an audio mp3 file, like as in compressed audio.

I can convert it to wav or ascii with some other app and then read it, but I really want to bypass that step and just read the mp3 file in directly.

I'm using Mathcad11 & 14.

Thanks.

Re: reading an mp3 audio file? (not McadPrime3)

terryhendicott — Sun, 04 Mar 2018 04:18:05 GMT

https://sourceforge.net/projects/audacity/

This free application will convert mp3 to wav and then you can read the wav file in Mathcad

If you really want to reinvent the wheel:-)

http://www.mp3-converter.com/mp3codec/mp3_anatomy.htm

http://wiki.tcl.tk/8759

These will help

Re: reading an mp3 audio file? (not McadPrime3)

ptc-1398121 — Sun, 04 Mar 2018 04:28:39 GMT

yes I have audacity and others as well. Other apps have been importing mp3's easily for 20 years or so. Why by now is there no way to do it in Mcad?

Don't really want to re-invent the wheel. Was hoping someone else had already done it.

Re: reading an mp3 audio file? (not McadPrime3)

terryhendicott — Mon, 05 Mar 2018 07:52:52 GMT

Hi,

Someone else has done it in C++. By "it" I mean reading of MP3 files.

https://github.com/audioboy77/OpenMP3 [Licence free C++ MP3 decoder library]

It is possible to integrate this into a user defined function in MathCad by making a DLL from the above library.

You can then call the user defined function. Look in Mathcad help under "Custom Functions".

This makes access to the data in the frames of an MP3 file possible.

How much do you need the function?

Cheers

Re: reading an mp3 audio file? (not McadPrime3)

ptc-1398121 — Mon, 05 Mar 2018 08:33:36 GMT

Well I have about 6-7 hours of 8kHz sampled data to handle every day so was hoping I could acquire it into and store it in mp3 files to save space. Unfortunately I'm finding Mathcad to be very unstable when I try to process very much data at a time so maybe it's not going to work very efficiently for me, even if I have a read mp3 function.

The read function would have to be able to read in segments at a time like the READBIN function can do, as mathcad is not much good for vectors over about 300,000 samples.

Re: reading an mp3 audio file? (not McadPrime3)

terryhendicott — Mon, 05 Mar 2018 08:55:10 GMT

Hi,

The mathcad community may not like me giving this advice

Look into Scilab. http://www.scilab.org/en/download/6.0.1

It has wav and au file support for sound. It is a free version of a matlab substitute originally from France.

It is better for very large datasets

Cheers

Tezza

Re: reading an mp3 audio file? (not McadPrime3)

Fred_Kohlhepp — Mon, 05 Mar 2018 11:49:33 GMT

"octave" is another "free MatLab." Capable of executing most Matlab scripts.

Re: reading an mp3 audio file? (not McadPrime3)

ptc-1398121 — Tue, 06 Mar 2018 03:48:14 GMT

Thanks for those suggestions.