[Asterisk-video] SIP fmtp message support for H.264 video

[craig brown]

Jonathan,

 

                If you replace this function in chan_sip.c, it works
quite well with most VC systems, especially on H.264. It's a bit of a
local hack, and I'm working on a far better solution, but it works demo
purposes.

 

/*! \brief Add video codec offer to SDP offer/answer body in INVITE or
200 OK */

/* This is different to the audio one now so we can add more caps later
*/

static void add_vcodec_to_sdp(const struct sip_pvt *p, int codec, int
sample_rate,

                             struct ast_str **m_buf, struct ast_str
**a_buf,

                             int debug, int *min_packet_size)

{

        int rtp_code;

 

 

 

        if (!p->vrtp)

                return;

 

        if (debug)

                ast_verbose("Adding video codec 0x%x (%s) to SDP\n",
codec, ast_getformatname(codec));

 

        if ((rtp_code = ast_rtp_lookup_code(p->vrtp, 1, codec)) == -1)

                return;

 

        ast_str_append(m_buf, 0, " %d", rtp_code);

        ast_str_append(a_buf, 0, "a=rtpmap:%d %s/%d\r\n", rtp_code,

                         ast_rtp_lookup_mime_subtype(1, codec, 0),
sample_rate);

        /* Add fmtp code here */

 

 

        if (debug)

                ast_verbose ("FMTP Codec Count %d\r\nCodec is
0x%x\r\n",p->fmtp_count,codec);

 

 

        /* Craig */

        if (codec & 0x100000) {

                ast_verbose ("Appending H263+ FMTP Video\n");

                ast_str_append(a_buf,0,"a=fmtp:%d
custom=1280,800,0;custom=1280,768,0;custom=1280,720,3;custom=1024,768,4;
custom=1024,576,2;custom=800,600,3;cif4=2;custom=720,480,2;custom=640,48
0,2;custom=512,288,1;cif=1;custom=352,240,1;qcif=1;sqcif=1;maxbr=10240\r
\n",rtp_code);

        }

        if (codec & 0x200000) {

                ast_verbose("Appending H264 FMTP Video\n");

                ast_str_append(a_buf,0,"a=fmtp:%d
profile-level-id=428016;max-mbps=245000;max-fs=8160;max-smbps=245000\r\n
",rtp_code);

        }

 

 

}

 

Craig brown

 

From: asterisk-video-bounces at lists.digium.com
[mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Gallmeier,
Jonathan
Sent: 18 August 2009 22:17
To: asterisk-video at lists.digium.com
Subject: [Asterisk-video] SIP fmtp message support for H.264 video

 

Hi,

 

I'm working on an Asterisk app that bridges SIP video to a soft phone
that only supports RTP video in/out of the phone's SDK. The only video
format supported is H.264.  I noticed that Asterisk SIP appears to lack
fmtp messages. Is anyone working on adding these into the SIP code? I
noticed a few comments regarding this issue in some of the bugs, but I
have not found anything that indicates that there is active development
in this area.

 

Thanks

 

Jonathan

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