Hi,
I am still trying to stream audio/video with VLC, replacing PJMEDIA. I have
a problem for writing the SDP manually. For a first try, I wrote a SDP for
streaming a MPEG-1 Audio Layer II file (MP2, static payload 14). My code is
(a lot is taken from pjmedia_endpt_create_sdp) :
static const pj_str_t STR_AUDIO = { "audio", 5};
> static const pj_str_t STR_VIDEO = { "video", 5};
> static const pj_str_t STR_IN = { "IN", 2 };
> static const pj_str_t STR_IP4 = { "IP4", 3};
> static const pj_str_t STR_RTP_AVP = { "RTP/AVP", 7 };
> static const pj_str_t STR_SDP_NAME = { "pjmedia", 7 };
> static const pj_str_t STR_SENDRECV = { "sendrecv", 8 };
>
>
> pj_time_val tv;
> pjmedia_sdp_session *sdp;
> pjmedia_sdp_media *m;
> pjmedia_sdp_attr *attr;
> pj_pool_t *pool;
>
> pool = pj_pool_create(&cp.factory, // the factory
> "pool2", // pool's name
> 4000, // initial size
> 4000, // increment size
> NULL);
>
>
> /* Create and initialize basic SDP session */
> sdp = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_session);
>
> pj_gettimeofday(&tv);
> sdp->origin.user = pj_str("-");
> sdp->origin.version = sdp->origin.id = tv.sec + 2208988800UL;
> sdp->origin.net_type = STR_IN;
> sdp->origin.addr_type = STR_IP4;
> sdp->origin.addr = pj_str(transport->local_name.host.ptr);
> sdp->name = STR_SDP_NAME;
>
> /* Since we only support one media stream at present, put the
> * SDP connection line in the session level.
> */
> sdp->conn = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_conn);
> sdp->conn->net_type = STR_IN;
> sdp->conn->addr_type = STR_IP4;
> sdp->conn->addr = sdp->conn->addr;
>
>
> /* SDP time and attributes. */
> sdp->time.start = sdp->time.stop = 0;
> sdp->attr_count = 0;
>
> /* Create media stream 0: */
>
> sdp->media_count = 1;
> m = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_media);
> sdp->media[0] = m;
>
> /* Standard media info: */
> m->desc.media = pj_str("audio");
> m->desc.port = 4000;
> m->desc.port_count = 1;
> pj_strdup (pool, &m->desc.transport, &STR_RTP_AVP);
> m->desc.fmt_count = 1;
> m->desc.fmt[0] = pj_str("14");
>
> m->attr_count = 0;
>
>
> char temp[80];
> pj_str_t dst_uri = pj_str("sip:bob at open-ims.test");
> pj_str_t local_uri;
> pjsip_dialog *dlg;
> pjmedia_sdp_session *local_sdp;
> pjsip_tx_data *tdata;
>
> pj_ansi_sprintf(temp, "sip:simpleuac@%s",
> pjsip_endpt_name(g_endpt)->ptr);
> local_uri = pj_str(temp);
>
> /* Create UAC dialog */
> status = pjsip_dlg_create_uac( pjsip_ua_instance(),
> &local_uri, /* local URI */
> NULL, /* local Contact */
> &dst_uri, /* remote URI */
> &dst_uri, /* remote target */
> &dlg); /* dialog */
> if (status != PJ_SUCCESS) {
> app_perror(THIS_FILE, "Unable to create UAC dialog", status);
> }
>
>
> local_sdp=sdp;
> pj_register_strerror(PJMEDIA_ERRNO_START, PJ_ERRNO_SPACE_SIZE,
> &pjmedia_strerror);
>
> /* Create the INVITE session, and pass the SDP returned earlier
> * as the session's initial capability.
> */
> status = pjsip_inv_create_uac( dlg, local_sdp, 0, &g_inv);
> PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);
But I get "*pjmedia_sdp_neg_create_w_local_offer: Assertion
`(status=pjmedia_sdp_validate(local))==0' failed*". I should have an error
in my SDP but I don't see where ! I did not put a rtpmap but if I understood
well it should not be needed for a static payload.
Cheers,
Damien
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