Re: [Linphone-developers] question about rtp packets

[meng hongling]

I've solved this problem.thank you simon.
not I can here sound from both side.but there is sound delay and the sound 
is discontinuous.
you told me it my because the big block size(mine is 8192).but what should 
I do to solve this problem.and in the process,there are too many "Must 
catchup" Warnings. 

> From: Simon Morlat <address@hidden>
> To: address@hidden
> CC: "meng hongling" <address@hidden>
> Subject: Re: [Linphone-developers] question about rtp packets
> Date: Thu, 16 Mar 2006 22:40:55 +0100
>
> Le Jeudi 16 Mars 2006 14:13, meng hongling a �crit?
> > another more question
> > Since my sound card only support stereo,I have to discard a half 
samples.
> > so I edit osscard.c oss_card_read() function like this:
> > char *buf;
> > buf=(char *)malloc(2*bsize);   ******here my board bsize=8192
> > err2=read(obj->fd,buf,bsize*2);
> > err=err2/2;
> > char buffer[err];
> > for (j=0;j<err;j=j+2)
> > {
> >  buffer[j]=buf[2*j];          ******ample format is 16 bits so I have 
to
> > discard 2 bytes in
> >  buffer[j+1]=buf[2*j+1];      ******every 4 bytes.
> > }
> > obj->readbuf=buffer;
>
> The variable buffer is on the stack. It is discarded when you go out of 
the
> oss_card_read() function. You should copy the samples directly to
> obj->readbuf, not replace it.
>
> Simon

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