About the "lost synchronisation", "forbidden bitrate" value, I could be wrong but, from what I have found on my side, for avoid most (98%) of these errors; you have to feed the MAD decoder with 1 second chunk.

That means 37 MPEG-1 packets that you detect with the following routine:

#define MPEG1_SYNC_NOT_FOUND -1

//------------------------------------------------------------------------------

//------------------------------------------------------------- FindMPEG1SyncPos

//------------------------------------------------------------------------------

int CMADDecoder::FindMPEG1SyncPos(BYTE *pFrame, int FrameSize){

    //------------------------------- Variables --------------------------------

    int LastBytePos = FrameSize - 1;

    int i                          ;

    //--------------------------------- Code -----------------------------------

//printf ("\n CMADDecoder::FindMPEG1SyncPos:: 0x%08X-%d",

//        pFrame, FrameSize);

//fflush(stdout);

    for (i = 0; i < LastBytePos; i++){

        if ( ((pFrame[i    ] == 0xFF)        ) &&

             ((pFrame[i + 1]  & 0xFC) == 0xFC) ){      

            return i;                   

        }// If we found the sync word

    }// For all the byte to check

    return MPEG1_SYNC_NOT_FOUND; // Not found

}// FindMPEG1SyncPos

Regards

Bruno

-----Message d'origine-----
De : mad-dev-bounces@lists.mars.org [mailto:mad-dev-bounces@lists.mars.org] De la part de Håvard Sperle Engebretsen
Envoyé : 30 septembre 2005 09:08
À : mad-dev@lists.mars.org
Objet : [mad-dev] Errors when running minimad

Hi!

1)

I'm a little bit confused!

I am trying to run libmad in Cygwin and while installing libmad I

flagged the configure command:

"./configure --disable-shared --enable-profiling", and then made the

install. Does this make libmad a static ilbrary so that I don't have to

use the flag "-static" while compiling minimad.c?

(I was told to make the library static because gprof doesn't support

dynamic libraries...)

2)

After having some problems compiling minimad.c I read in another post in

the mad-dev archives that I should use "make minimad.exe" to cimpile it.

This works fine, but when I try to run it with "./minimad <test.mp3>

test.pcm" I get some errors:

decoding error 0x0101 (lost synchronisation) at byte offset 0

decoding error 0x0103 (forbidden bitrate value) at byte offset 163

decoding error 0x0103 (forbidden bitrate value) at byte offset 213

.

.

.

decoding error 0x0104 (reserved sample frequency value) at byte offset

224

decoding error 0x0103 (forbidden bitrate value) at byte offset 295

decoding error 0x0235 (bad main_data_begin pointer) at byte offset 412

Does anyone know what this means?

Thanks in advance!

H

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