Import pjproject-2.0.1

1 files changed, 385 insertions, 0 deletions

diff --git a/pjmedia/src/pjmedia/vid_stream_info.c b/pjmedia/src/pjmedia/vid_stream_info.c
new file mode 100644
index 0000000..51b688f
--- /dev/null
+++ b/pjmedia/src/pjmedia/vid_stream_info.c
@@ -0,0 +1,385 @@
+/* $Id: vid_stream_info.c 3982 2012-03-22 09:56:52Z bennylp $ */
+/*
+ * Copyright (C) 2011 Teluu Inc. (http://www.teluu.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <pjmedia/vid_stream.h>
+#include <pjmedia/sdp_neg.h>
+#include <pjmedia/stream_common.h>
+#include <pj/ctype.h>
+#include <pj/rand.h>
+
+
+static const pj_str_t ID_VIDEO = { "video", 5};
+static const pj_str_t ID_IN = { "IN", 2 };
+static const pj_str_t ID_IP4 = { "IP4", 3};
+static const pj_str_t ID_IP6 = { "IP6", 3};
+static const pj_str_t ID_RTP_AVP = { "RTP/AVP", 7 };
+static const pj_str_t ID_RTP_SAVP = { "RTP/SAVP", 8 };
+//static const pj_str_t ID_SDP_NAME = { "pjmedia", 7 };
+static const pj_str_t ID_RTPMAP = { "rtpmap", 6 };
+
+static const pj_str_t STR_INACTIVE = { "inactive", 8 };
+static const pj_str_t STR_SENDRECV = { "sendrecv", 8 };
+static const pj_str_t STR_SENDONLY = { "sendonly", 8 };
+static const pj_str_t STR_RECVONLY = { "recvonly", 8 };
+
+
+/*
+ * Internal function for collecting codec info and param from the SDP media.
+ */
+static pj_status_t get_video_codec_info_param(pjmedia_vid_stream_info *si,
+					      pj_pool_t *pool,
+					      pjmedia_vid_codec_mgr *mgr,
+					      const pjmedia_sdp_media *local_m,
+					      const pjmedia_sdp_media *rem_m)
+{
+    unsigned pt = 0;
+    const pjmedia_vid_codec_info *p_info;
+    pj_status_t status;
+
+    pt = pj_strtoul(&local_m->desc.fmt[0]);
+
+    /* Get payload type for receiving direction */
+    si->rx_pt = pt;
+
+    /* Get codec info and payload type for transmitting direction. */
+    if (pt < 96) {
+	/* For static payload types, get the codec info from codec manager. */
+	status = pjmedia_vid_codec_mgr_get_codec_info(mgr, pt, &p_info);
+	if (status != PJ_SUCCESS)
+	    return status;
+
+	si->codec_info = *p_info;
+
+	/* Get payload type for transmitting direction.
+	 * For static payload type, pt's are symetric.
+	 */
+	si->tx_pt = pt;
+    } else {
+	const pjmedia_sdp_attr *attr;
+	pjmedia_sdp_rtpmap *rtpmap;
+	pjmedia_codec_id codec_id;
+	pj_str_t codec_id_st;
+	unsigned i;
+
+	/* Determine payload type for outgoing channel, by finding
+	 * dynamic payload type in remote SDP that matches the answer.
+	 */
+	si->tx_pt = 0xFFFF;
+	for (i=0; i<rem_m->desc.fmt_count; ++i) {
+	    if (pjmedia_sdp_neg_fmt_match(NULL,
+					  (pjmedia_sdp_media*)local_m, 0,
+					  (pjmedia_sdp_media*)rem_m, i, 0) ==
+		PJ_SUCCESS)
+	    {
+		/* Found matched codec. */
+		si->tx_pt = pj_strtoul(&rem_m->desc.fmt[i]);
+		break;
+	    }
+	}
+
+	if (si->tx_pt == 0xFFFF)
+	    return PJMEDIA_EMISSINGRTPMAP;
+
+	/* For dynamic payload types, get codec name from the rtpmap */
+	attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
+					   &local_m->desc.fmt[0]);
+	if (attr == NULL)
+	    return PJMEDIA_EMISSINGRTPMAP;
+
+	status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
+	if (status != PJ_SUCCESS)
+	    return status;
+
+	/* Then get the codec info from the codec manager */
+	pj_ansi_snprintf(codec_id, sizeof(codec_id), "%.*s/",
+			 (int)rtpmap->enc_name.slen, rtpmap->enc_name.ptr);
+	codec_id_st = pj_str(codec_id);
+	i = 1;
+	status = pjmedia_vid_codec_mgr_find_codecs_by_id(mgr, &codec_id_st,
+							 &i, &p_info, NULL);
+	if (status != PJ_SUCCESS)
+	    return status;
+
+	si->codec_info = *p_info;
+    }
+
+
+    /* Request for codec with the correct packing for streaming */
+    si->codec_info.packings = PJMEDIA_VID_PACKING_PACKETS;
+
+    /* Now that we have codec info, get the codec param. */
+    si->codec_param = PJ_POOL_ALLOC_T(pool, pjmedia_vid_codec_param);
+    status = pjmedia_vid_codec_mgr_get_default_param(mgr,
+						     &si->codec_info,
+						     si->codec_param);
+
+    /* Adjust encoding bitrate, if higher than remote preference. The remote
+     * bitrate preference is read from SDP "b=TIAS" line in media level.
+     */
+    if ((si->dir & PJMEDIA_DIR_ENCODING) && rem_m->bandw_count) {
+	unsigned i, bandw = 0;
+
+	for (i = 0; i < rem_m->bandw_count; ++i) {
+	    const pj_str_t STR_BANDW_MODIFIER_TIAS = { "TIAS", 4 };
+	    if (!pj_stricmp(&rem_m->bandw[i]->modifier,
+		&STR_BANDW_MODIFIER_TIAS))
+	    {
+		bandw = rem_m->bandw[i]->value;
+		break;
+	    }
+	}
+
+	if (bandw) {
+	    pjmedia_video_format_detail *enc_vfd;
+	    enc_vfd = pjmedia_format_get_video_format_detail(
+					&si->codec_param->enc_fmt, PJ_TRUE);
+	    if (!enc_vfd->avg_bps || enc_vfd->avg_bps > bandw)
+		enc_vfd->avg_bps = bandw * 3 / 4;
+	    if (!enc_vfd->max_bps || enc_vfd->max_bps > bandw)
+		enc_vfd->max_bps = bandw;
+	}
+    }
+
+    /* Get remote fmtp for our encoder. */
+    pjmedia_stream_info_parse_fmtp(pool, rem_m, si->tx_pt,
+				   &si->codec_param->enc_fmtp);
+
+    /* Get local fmtp for our decoder. */
+    pjmedia_stream_info_parse_fmtp(pool, local_m, si->rx_pt,
+				   &si->codec_param->dec_fmtp);
+
+    /* When direction is NONE (it means SDP negotiation has failed) we don't
+     * need to return a failure here, as returning failure will cause
+     * the whole SDP to be rejected. See ticket #:
+     *	http://
+     *
+     * Thanks Alain Totouom
+     */
+    if (status != PJ_SUCCESS && si->dir != PJMEDIA_DIR_NONE)
+	return status;
+
+    return PJ_SUCCESS;
+}
+
+
+
+/*
+ * Create stream info from SDP media line.
+ */
+PJ_DEF(pj_status_t) pjmedia_vid_stream_info_from_sdp(
+					   pjmedia_vid_stream_info *si,
+					   pj_pool_t *pool,
+					   pjmedia_endpt *endpt,
+					   const pjmedia_sdp_session *local,
+					   const pjmedia_sdp_session *remote,
+					   unsigned stream_idx)
+{
+    const pjmedia_sdp_attr *attr;
+    const pjmedia_sdp_media *local_m;
+    const pjmedia_sdp_media *rem_m;
+    const pjmedia_sdp_conn *local_conn;
+    const pjmedia_sdp_conn *rem_conn;
+    int rem_af, local_af;
+    pj_sockaddr local_addr;
+    pj_status_t status;
+
+    PJ_UNUSED_ARG(endpt);
+
+    /* Validate arguments: */
+    PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL);
+    PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL);
+    PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL);
+
+    /* Keep SDP shortcuts */
+    local_m = local->media[stream_idx];
+    rem_m = remote->media[stream_idx];
+
+    local_conn = local_m->conn ? local_m->conn : local->conn;
+    if (local_conn == NULL)
+	return PJMEDIA_SDP_EMISSINGCONN;
+
+    rem_conn = rem_m->conn ? rem_m->conn : remote->conn;
+    if (rem_conn == NULL)
+	return PJMEDIA_SDP_EMISSINGCONN;
+
+    /* Media type must be video */
+    if (pj_stricmp(&local_m->desc.media, &ID_VIDEO) != 0)
+	return PJMEDIA_EINVALIMEDIATYPE;
+
+
+    /* Reset: */
+
+    pj_bzero(si, sizeof(*si));
+
+    /* Media type: */
+    si->type = PJMEDIA_TYPE_VIDEO;
+
+    /* Transport protocol */
+
+    /* At this point, transport type must be compatible,
+     * the transport instance will do more validation later.
+     */
+    status = pjmedia_sdp_transport_cmp(&rem_m->desc.transport,
+				       &local_m->desc.transport);
+    if (status != PJ_SUCCESS)
+	return PJMEDIA_SDPNEG_EINVANSTP;
+
+    if (pj_stricmp(&local_m->desc.transport, &ID_RTP_AVP) == 0) {
+
+	si->proto = PJMEDIA_TP_PROTO_RTP_AVP;
+
+    } else if (pj_stricmp(&local_m->desc.transport, &ID_RTP_SAVP) == 0) {
+
+	si->proto = PJMEDIA_TP_PROTO_RTP_SAVP;
+
+    } else {
+
+	si->proto = PJMEDIA_TP_PROTO_UNKNOWN;
+	return PJ_SUCCESS;
+    }
+
+
+    /* Check address family in remote SDP */
+    rem_af = pj_AF_UNSPEC();
+    if (pj_stricmp(&rem_conn->net_type, &ID_IN)==0) {
+	if (pj_stricmp(&rem_conn->addr_type, &ID_IP4)==0) {
+	    rem_af = pj_AF_INET();
+	} else if (pj_stricmp(&rem_conn->addr_type, &ID_IP6)==0) {
+	    rem_af = pj_AF_INET6();
+	}
+    }
+
+    if (rem_af==pj_AF_UNSPEC()) {
+	/* Unsupported address family */
+	return PJ_EAFNOTSUP;
+    }
+
+    /* Set remote address: */
+    status = pj_sockaddr_init(rem_af, &si->rem_addr, &rem_conn->addr,
+			      rem_m->desc.port);
+    if (status != PJ_SUCCESS) {
+	/* Invalid IP address. */
+	return PJMEDIA_EINVALIDIP;
+    }
+
+    /* Check address family of local info */
+    local_af = pj_AF_UNSPEC();
+    if (pj_stricmp(&local_conn->net_type, &ID_IN)==0) {
+	if (pj_stricmp(&local_conn->addr_type, &ID_IP4)==0) {
+	    local_af = pj_AF_INET();
+	} else if (pj_stricmp(&local_conn->addr_type, &ID_IP6)==0) {
+	    local_af = pj_AF_INET6();
+	}
+    }
+
+    if (local_af==pj_AF_UNSPEC()) {
+	/* Unsupported address family */
+	return PJ_SUCCESS;
+    }
+
+    /* Set remote address: */
+    status = pj_sockaddr_init(local_af, &local_addr, &local_conn->addr,
+			      local_m->desc.port);
+    if (status != PJ_SUCCESS) {
+	/* Invalid IP address. */
+	return PJMEDIA_EINVALIDIP;
+    }
+
+    /* Local and remote address family must match */
+    if (local_af != rem_af)
+	return PJ_EAFNOTSUP;
+
+    /* Media direction: */
+
+    if (local_m->desc.port == 0 ||
+	pj_sockaddr_has_addr(&local_addr)==PJ_FALSE ||
+	pj_sockaddr_has_addr(&si->rem_addr)==PJ_FALSE ||
+	pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL)
+    {
+	/* Inactive stream. */
+
+	si->dir = PJMEDIA_DIR_NONE;
+
+    } else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) {
+
+	/* Send only stream. */
+
+	si->dir = PJMEDIA_DIR_ENCODING;
+
+    } else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) {
+
+	/* Recv only stream. */
+
+	si->dir = PJMEDIA_DIR_DECODING;
+
+    } else {
+
+	/* Send and receive stream. */
+
+	si->dir = PJMEDIA_DIR_ENCODING_DECODING;
+
+    }
+
+    /* No need to do anything else if stream is rejected */
+    if (local_m->desc.port == 0) {
+	return PJ_SUCCESS;
+    }
+
+    /* If "rtcp" attribute is present in the SDP, set the RTCP address
+     * from that attribute. Otherwise, calculate from RTP address.
+     */
+    attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
+				  "rtcp", NULL);
+    if (attr) {
+	pjmedia_sdp_rtcp_attr rtcp;
+	status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp);
+	if (status == PJ_SUCCESS) {
+	    if (rtcp.addr.slen) {
+		status = pj_sockaddr_init(rem_af, &si->rem_rtcp, &rtcp.addr,
+					  (pj_uint16_t)rtcp.port);
+	    } else {
+		pj_sockaddr_init(rem_af, &si->rem_rtcp, NULL,
+				 (pj_uint16_t)rtcp.port);
+		pj_memcpy(pj_sockaddr_get_addr(&si->rem_rtcp),
+		          pj_sockaddr_get_addr(&si->rem_addr),
+			  pj_sockaddr_get_addr_len(&si->rem_addr));
+	    }
+	}
+    }
+
+    if (!pj_sockaddr_has_addr(&si->rem_rtcp)) {
+	int rtcp_port;
+
+	pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr));
+	rtcp_port = pj_sockaddr_get_port(&si->rem_addr) + 1;
+	pj_sockaddr_set_port(&si->rem_rtcp, (pj_uint16_t)rtcp_port);
+    }
+
+    /* Get codec info and param */
+    status = get_video_codec_info_param(si, pool, NULL, local_m, rem_m);
+
+    /* Leave SSRC to random. */
+    si->ssrc = pj_rand();
+
+    /* Set default jitter buffer parameter. */
+    si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1;
+
+    return status;
+}
+
+