NewLC - Creating MP3 Decoder - Comments

Re: Creating MP3 Decoder

Facepalm — Sat, 14 Feb 2009 09:01:28 +0100

Very useful files search engine. http://Indexoffiles.com is a search engine designed to search files in various file sharing and uploading sites.

Re: Creating MP3 Decoder

zgly — Wed, 15 Oct 2008 04:38:11 +0200

i can biuld this code , but i don't know how to use this dll.

player implementation

yogiam — Tue, 15 May 2007 15:21:58 +0200

Hi denis,

I am a newbie to Symbian. I am trying to write a very basic player wihh your MP3decodeDll.

I am pasting the main code below. Could you please guide me what to do further. That will be of great help. Any pointers or links will also be helpful. I am breaking my head on it from past 1 week

void foo()
{
//declare names for the files
_LIT(name, "C:\\system\\test.mp3");

//open the file server session
RFs session;
session.Connect();

//create the mp3 decoder
CMP3DecodeEngine *md = CMP3DecodeEngine::NewL();

//open the file
TBufC<256> fn;
fn = pcm;
md->OpenFile(session, fn);

//declare a buffer where pcm data will be decoded
TBuf<8192> buf;

//decode a frame
md->DecodeOneFrame(buf);

//how do i play the complete song?

//get the buffer
TBufC<8192> pcmdata = md->GetBuffer();

//close the decoder
md->CloseFile();

//close the file server session
session.Close();
}

Creating MP3 Decoder

Anonymous — Tue, 16 Jan 2007 14:43:33 +0100

Thanks a lot for this article and the DLL, it will be a big help to me. I am developing a streaming application, and I wanted to ask if I could use this DLL for my app. I won't have a file, but I will have MP3 data from a buffer, is it just a case of calling the DecodeOneFrame() function and then getting the decoded data after that? I assume it can be used for this purpose, but I just need a sanity check.

Thanks again

Creating MP3 Decoder

Anonymous — Tue, 19 Sep 2006 23:04:36 +0200

How use this library?

> Creating MP3 Decoder

mp3 — Fri, 26 May 2006 21:05:53 +0200

thnx for tutorial, but i think its too hard for some people. pls can someone upload his dll's to rapidshare and just give us a link? thnx billion times.

> Creating MP3 Decoder

abdul cader — Thu, 18 May 2006 16:02:50 +0200

hi i want to paly mp3 file in my linux pc using minimad i did make minimad ./minimad <mp3filename> test.wav but it doesnt play.....so how i play mp3 using minimad? help me? regards cader

Creating MP3 Decoder

Aro — Fri, 05 May 2006 00:25:45 +0200

Can anybody give a sample that uses this lib ?

Creating MP3 Decoder

Anonymous — Wed, 01 Mar 2006 03:30:57 +0100

great articles! i'v translated it into chinese version. would you mind i use it to help other developers in china ?

Creating MP3 Decoder

Lorand — Thu, 16 Feb 2006 06:58:52 +0100

Hello!

I'm using the MADLIB decoder only on 6600. The reason: it is not playing mp3 songs with good quality. I convert the mp3 frames into 8 Bit PCM. Can I convert this frames to play a wave file, or something else? I'm not pleased with the result. Maybe I'm doing something wrong.

Regards, Lorand

> Creating MP3 Decoder

lorand — Tue, 10 Jan 2006 18:19:22 +0100

Hi All!

I also has finished with my mp3 player project, and has the same problem.

Regards, Lorand

> Creating MP3 Decoder

ad209 — Mon, 19 Dec 2005 07:30:01 +0100

Hi,I has been finished our mp3 soft-decode with your MP3DECODEDLL project. Thank you. But I try to run our player over 12 hours , my phone(panasonic X700) show a message :"Out of memory! Close other applications." , then my player is closed . I tried to check where lost memory in my program , like following : I replace this line only: iMP3Decode->DecodeOneFrame(iBuffer16);//decode one frame with: iBuffer16.Fillz(iBuffer16.MaxLength);//Directly fill zero to my buffer and not use real decoder So my program can run many many hours and not lose memory. I think , Maybe the MP3DecodeDLL has bug?

> Creating MP3 Decoder

Anonymous — Sat, 26 Nov 2005 18:40:08 +0100

Well PCM streams will not work unless u filter it and try to fuse the 2 channels into one. u will find some information in the minimad.c file which comes as a part of the libmad tarball. infact if u just compile it under linux , open a mp3 file and pipe output to /dev/dsp u can hear it well (slightly distorted though). the trick is in the function "scale"( something just check the name i am too lazy to open that file now). check it out. this is the one that does the "filtering" before output in small endian format. i am sure u will find a way out cheers-- ashwin

> Creating MP3 Decoder

Lorand — Sat, 01 Oct 2005 09:00:00 +0200

Hi!

I implemented the sources into my project. I did a decoding fram-by-frame. The result buffer I saved into a new file. I tried to play the new file as .pcm stream, but unsuccessful.

Please let me know, what U mean under the follows:
  apply filter
  synthesize decoded frame to PCM samples
  resample PCM samples

Is it not enough to decode the mp3 file frame-by-frame?

Thanks and regards, Lorand

> Creating MP3 Decoder

Anonymous — Wed, 21 Sep 2005 20:20:15 +0200

thats very complicated.thanks will this work in nokia 6600?? how can i do aaall this??

Creating MP3 Decoder

denis — Thu, 28 Apr 2005 10:18:14 +0200

Adopt MAD (MPEG audio decoder library) to usage with Symbian. This article teaches you how to port this high quality audio decoder on the Symbian OS platform. Interesting if you need to decode MP3 by yourself at your application...