Re: Synchronization error near the end of file

On Sep 14, 2005, at 3:40 AM, Marcello Maggioni wrote:
> I'm tring to get started with "libmad" so I've tried to make an  
> application very similar to "minimad.c" , the one included in the  
> source code, only that instead of reading and writing from STDIN to  
> STDOUT it reads and writes from and to files.
>
> The problem that I get is that I get a strange synchronization  
> error near the end of the file :
>
>  Decoding /balthasar/****.mp3
> 0  <-- ID3Tad size
> decoding error 0x0101 (lost synchronization) at byte offset 3072836
>
>
> The actual size of the file is : 3072949
>
> I get this almost with every file I try to decode.
>
> I manage the input by creating with "malloc()" a memory area of  
> "unsigned chars" of the size of the file , then I fread the mp3  
> file into memory and pass the pointer to the callback input function .
>
> I miss something or I made any mistakes?

Try this: when you call malloc(), allocate MAD_BUFFER_GUARD extra  
bytes at the end and fill them with zero bytes. This will allow the  
decoder to fully decode the last frame.

> PS= Do you know how to check the correctness of a Raw 16bit PCM  
> stream?? I've tried to play my file with many players , but it  
> doesn't work. Sorry but I'm a newbie of digital audio :)

You might want to prepend a WAV or AIFF header to the raw PCM so that  
other applications can understand the data. See the audio_wave.c and  
audio_aiff.c files from madplay for an example.

-- 
Rob Leslie
[email protected]