/* GStreamer * Copyright (C) 2008 Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION:rtsp-sdp * @short_description: Make SDP messages * @see_also: #GstRTSPMedia * * Last reviewed on 2013-07-11 (1.0.0) */ #include #include "rtsp-sdp.h" static gboolean get_info_from_tags (GstPad * pad, GstEvent ** event, gpointer user_data) { GstSDPMedia *media = (GstSDPMedia *) user_data; if (GST_EVENT_TYPE (*event) == GST_EVENT_TAG) { GstTagList *tags; guint bitrate = 0; gst_event_parse_tag (*event, &tags); if (gst_tag_list_get_scope (tags) != GST_TAG_SCOPE_STREAM) return TRUE; if (!gst_tag_list_get_uint (tags, GST_TAG_MAXIMUM_BITRATE, &bitrate) || bitrate == 0) if (!gst_tag_list_get_uint (tags, GST_TAG_BITRATE, &bitrate) || bitrate == 0) return TRUE; /* set bandwidth (kbits/s) */ gst_sdp_media_add_bandwidth (media, GST_SDP_BWTYPE_AS, bitrate / 1000); return FALSE; } return TRUE; } static void update_sdp_from_tags (GstRTSPStream * stream, GstSDPMedia * stream_media) { GstPad *src_pad; src_pad = gst_rtsp_stream_get_srcpad (stream); gst_pad_sticky_events_foreach (src_pad, get_info_from_tags, stream_media); gst_object_unref (src_pad); } /** * gst_rtsp_sdp_from_media: * @sdp: a #GstSDPMessage * @info: info * @media: a #GstRTSPMedia * * Add @media specific info to @sdp. @info is used to configure the connection * information in the SDP. * * Returns: TRUE on success. */ gboolean gst_rtsp_sdp_from_media (GstSDPMessage * sdp, GstSDPInfo * info, GstRTSPMedia * media) { guint i, n_streams; gchar *rangestr; n_streams = gst_rtsp_media_n_streams (media); rangestr = gst_rtsp_media_get_range_string (media, FALSE, GST_RTSP_RANGE_NPT); if (rangestr == NULL) goto not_prepared; gst_sdp_message_add_attribute (sdp, "range", rangestr); g_free (rangestr); for (i = 0; i < n_streams; i++) { GstRTSPStream *stream; GstSDPMedia *smedia; GstStructure *s; const gchar *caps_str, *caps_enc, *caps_params; gchar *tmp; gint caps_pt, caps_rate; guint n_fields, j; gboolean first; GString *fmtp; GstCaps *caps; stream = gst_rtsp_media_get_stream (media, i); caps = gst_rtsp_stream_get_caps (stream); if (caps == NULL) { g_warning ("ignoring stream %d without media type", i); continue; } s = gst_caps_get_structure (caps, 0); if (s == NULL) { gst_caps_unref (caps); g_warning ("ignoring stream %d without media type", i); continue; } gst_sdp_media_new (&smedia); /* get media type and payload for the m= line */ caps_str = gst_structure_get_string (s, "media"); gst_sdp_media_set_media (smedia, caps_str); gst_structure_get_int (s, "payload", &caps_pt); tmp = g_strdup_printf ("%d", caps_pt); gst_sdp_media_add_format (smedia, tmp); g_free (tmp); gst_sdp_media_set_port_info (smedia, 0, 1); gst_sdp_media_set_proto (smedia, "RTP/AVP"); /* for the c= line */ if (info->is_ipv6) { gst_sdp_media_add_connection (smedia, "IN", "IP6", "::", 16, 0); } else { gst_sdp_media_add_connection (smedia, "IN", "IP4", "0.0.0.0", 16, 0); } /* get clock-rate, media type and params for the rtpmap attribute */ gst_structure_get_int (s, "clock-rate", &caps_rate); caps_enc = gst_structure_get_string (s, "encoding-name"); caps_params = gst_structure_get_string (s, "encoding-params"); if (caps_enc) { if (caps_params) tmp = g_strdup_printf ("%d %s/%d/%s", caps_pt, caps_enc, caps_rate, caps_params); else tmp = g_strdup_printf ("%d %s/%d", caps_pt, caps_enc, caps_rate); gst_sdp_media_add_attribute (smedia, "rtpmap", tmp); g_free (tmp); } /* the config uri */ tmp = gst_rtsp_stream_get_control (stream); gst_sdp_media_add_attribute (smedia, "control", tmp); g_free (tmp); /* collect all other properties and add them to fmtp or attributes */ fmtp = g_string_new (""); g_string_append_printf (fmtp, "%d ", caps_pt); first = TRUE; n_fields = gst_structure_n_fields (s); for (j = 0; j < n_fields; j++) { const gchar *fname, *fval; fname = gst_structure_nth_field_name (s, j); /* filter out standard properties */ if (!strcmp (fname, "media")) continue; if (!strcmp (fname, "payload")) continue; if (!strcmp (fname, "clock-rate")) continue; if (!strcmp (fname, "encoding-name")) continue; if (!strcmp (fname, "encoding-params")) continue; if (!strcmp (fname, "ssrc")) continue; if (!strcmp (fname, "clock-base")) continue; if (!strcmp (fname, "seqnum-base")) continue; if (g_str_has_prefix (fname, "a-")) { /* attribute */ if ((fval = gst_structure_get_string (s, fname))) gst_sdp_media_add_attribute (smedia, fname + 2, fval); continue; } if (g_str_has_prefix (fname, "x-")) { /* attribute */ if ((fval = gst_structure_get_string (s, fname))) gst_sdp_media_add_attribute (smedia, fname, fval); continue; } if ((fval = gst_structure_get_string (s, fname))) { g_string_append_printf (fmtp, "%s%s=%s", first ? "" : ";", fname, fval); first = FALSE; } } if (!first) { tmp = g_string_free (fmtp, FALSE); gst_sdp_media_add_attribute (smedia, "fmtp", tmp); g_free (tmp); } else { g_string_free (fmtp, TRUE); } update_sdp_from_tags (stream, smedia); gst_sdp_message_add_media (sdp, smedia); gst_sdp_media_free (smedia); gst_caps_unref (caps); } { GstNetTimeProvider *provider; if ((provider = gst_rtsp_media_get_time_provider (media, info->server_ip, 0))) { GstClock *clock; gchar *address, *str; gint port; g_object_get (provider, "clock", &clock, "address", &address, "port", &port, NULL); str = g_strdup_printf ("GstNetTimeProvider %s %s:%d %" G_GUINT64_FORMAT, g_type_name (G_TYPE_FROM_INSTANCE (clock)), address, port, gst_clock_get_time (clock)); gst_sdp_message_add_attribute (sdp, "x-gst-clock", str); g_free (str); gst_object_unref (clock); g_free (address); gst_object_unref (provider); } } return TRUE; /* ERRORS */ not_prepared: { GST_ERROR ("media %p is not prepared", media); return FALSE; } }