[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Linphone-developers] Mediastreamer newbie seeks clue.

From: Herb Peyerl
Subject: Re: [Linphone-developers] Mediastreamer newbie seeks clue.
Date: Tue, 31 Aug 2010 16:49:15 -0400
User-agent: Mutt/

On Tue, Aug 31, 2010 at 11:45:21AM -0600, Matt Gilg wrote:
> I believe that generally, you need to create a new set of objects for each
> stream.  You can attach the streams to the same ticker, but you do need
> separate sessions & filters.  To create two streams and use them
> simultaneously, you'll also need to use a sound driver that supports the
> mixing of multiple audio sources.
> Hope this helps.

I must really be misunderstanding this ... It appears as though there's an 
audio mixer in mediastream2/src/audiomixer.c:

static void mixer_process(MSFilter *f){

which appears to be able to sum linear PCM streams:

static void accumulate(int32_t *sum, int16_t* contrib, int nwords){
        int i;

...and it also looks like oRTP is able to manage multiple RTP sessions using 
multiple RtpSession* objects with a custom select() ...

I think it should be able to mix multiple RTP sessions together and present a 
single unified LPCM stream to Alsa...

So it seems all the pieces are there but my little brain is failing to see how 
to put them all together ...

reply via email to

[Prev in Thread] Current Thread [Next in Thread]