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macOS How to analyze the BPM of AAC file or any library for converting AAC to MP3 file

I

iphonemobdev

macrumors newbie
Original poster
Jan 29, 2010
15
0
Hello Friends,

I am iphone developer and developing one mac application now. This is my first project ever in mac platform.

I have to analyze the BPM of the songs files. I have done this work for MP3 using FMOD and SoundTouch library.

But i have to analyze for AAC (M4A ) also but this library doesn't support to AAC format.

I tried to search library for AAC(M4A) and i did not get any thing for that. So we if could convert this AAC file to MP3 file by programatically in cocoa then we could analyze the bpm of that file.

I tried to search for converting AAC to Mp3 in cocoa and i got FAAC library but there is no any documentation for integrating with cocoa and its too complex.

Does anyone know about any other library for analyze BPM for AAC in cocoa project.

Many Many Thanks.
 
Core Audio might do what you want.

Have you searched lists.apple.com ?
 
Cromulent said:
libavcodec in FFmpeg is probably what you want. Make sure that you comply with the license requirements though if you are planning on statically linking it for an iPhone app.
Click to expand...

Thanks for reply.

I want to use this library for mac application only.
 
Hi,

I found libavdcodec in ffmpeg but i could not find that how to compile this library in xcode project. Plz can you give me some direction?.

Many Thanks.
 
Hi,

I did all the thing like this way and it installed ffmpeg in /usr/local/bin and i can ffmpeg in that directory. But i could not see any libavcodec.dylib in target->info->general.

Can you suggest any steps, Plz.

Thanks so much.
 
iphonemobdev said:
Hi,

I did all the thing like this way and it installed ffmpeg in /usr/local/bin and i can ffmpeg in that directory. But i could not see any libavcodec.dylib in target->info->general.

Can you suggest any steps, Plz.

Thanks so much.
Click to expand...

You have to manually add it. libavcodec.dylib will be in /usr/local/lib. You will also need to setup the header search path. I'm not sure if they are installed in /usr/local/include or /usr/local/include/ffmpeg it has been a little while since I have used ffmpeg.
 
Thanks for reply again.

Actually i checked all the directory mentioned by you and i got libavcodec.a in /usr/local/lib but i did not get any libavcodec.dylib. This libavcodec.a is in /usr/local.lib so i can not access that library.
 
iphonemobdev said:
Hi Cromulent,

Plz give me some guidelines on this issue.

Regards,
iPhoneMobDev
Click to expand...

The libavcodec.a file is a static library. Therefore you can use it but it will require that you statically link it into your application. You will need to setup your Xcode project to use the correct library and header search paths.

I wrote a blog post on the subject a little while ago:

Using Open Source Libraries on Mac OS X

from the sounds of it though you didn't compile it properly or you disabled shared libraries when you ran the configure script to setup FFMPEG.
 
Hi,

Actually i could not open your link.

I got following static library and header files,

1. libavcodec.a
2. libavformat.a
3. libavutil.a

I added this library and their header files into my project and there is no error. I can see this library added in Target->Info->General and i have edited the Header Search Path also.

I can add header file #import “avcodec.h” into xcode project also. I can use all the variables which have been declared in structure of that file. But i am trying to use any function from that class, i am getting some errors like,

Test.m
—-
“-avcodec_register_all”, referenced from:
-[Test initialize] in Test.o
Symbol(s) not found
collect2: id returned 1 exit status
—-

Do you what is the problem?

Many thanks.
 
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