From 4c535f5c30f7271f89d236f98fdfba101d73ff34 Mon Sep 17 00:00:00 2001
From: Joshua Colp <jcolp@digium.com>
Date: Wed, 25 Oct 2017 22:31:33 +0000
Subject: core / pjsip: Add support for grouping streams together.

In WebRTC streams (or media tracks in their world) can be grouped
together using the mslabel. This informs the browser that each
should be synchronized with each other.

This change extends the stream API so this information can
be stored with streams. The PJSIP support has been extended
to use the mslabel to determine grouped streams and store
this association on the streams. Finally when creating the
SDP the group information is used to cause each media stream
to use the same mslabel.

ASTERISK-27379

Change-Id: Id6299aa031efe46254edbdc7973c534d54d641ad
---
 include/asterisk/stream.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'include/asterisk/stream.h')

diff --git a/include/asterisk/stream.h b/include/asterisk/stream.h
index 2c1053a7b..c2d5a8877 100644
--- a/include/asterisk/stream.h
+++ b/include/asterisk/stream.h
@@ -476,4 +476,25 @@ struct ast_stream *ast_stream_topology_get_first_stream_by_type(
 void ast_stream_topology_map(const struct ast_stream_topology *topology,
 	struct ast_vector_int *types, struct ast_vector_int *v0, struct ast_vector_int *v1);
 
+/*!
+ * \brief Get the stream group that a stream is part of
+ *
+ * \param stream The stream
+ *
+ * \return the numerical stream group (-1 if not in a group)
+ *
+ * \since 15.2.0
+ */
+int ast_stream_get_group(const struct ast_stream *stream);
+
+/*!
+ * \brief Set the stream group for a stream
+ *
+ * \param stream The stream
+ * \param group The group the stream is part of
+ *
+ * \since 15.2.0
+ */
+void ast_stream_set_group(struct ast_stream *stream, int group);
+
 #endif /* _AST_STREAM_H */
-- 
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