bridge_softmix / app_confbridge: Add support for REMB combining.

This change adds the ability for multiple REMB reports in
bridge_softmix to be combined according to a configured
behavior into a single report. This single report is sent
back to the sender of video, which adjusts the encoding bitrate
to be at or below the bitrate of the report. The available
behaviors are: lowest, highest, and average. Lowest uses the
lowest received bitrate. Highest uses the highest received
bitrate. Average goes through the received bitrates adding
them to the previous average and creates a new average.

Other behaviors can be added in the future and the existing
average one may be adjusted, but this provides the foundation
to do so.

Support for configuring which behavior to use has been
added to app_confbridge.

ASTERISK-27804

Change-Id: I9eafe4e7c1f72d67074a8d6acb26bfcf19322b66

1 files changed, 12 insertions, 1 deletions

diff --git a/main/bridge.c b/main/bridge.c
index 8795081e2..2b347fd3f 100644
--- a/main/bridge.c
+++ b/main/bridge.c
@@ -3852,8 +3852,19 @@ void ast_bridge_set_video_update_discard(struct ast_bridge *bridge, unsigned int
 
 void ast_bridge_set_remb_send_interval(struct ast_bridge *bridge, unsigned int remb_send_interval)
 {
+	ast_assert(bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU);
+
+	ast_bridge_lock(bridge);
+	bridge->softmix.video_mode.mode_data.sfu_data.remb_send_interval = remb_send_interval;
+	ast_bridge_unlock(bridge);
+}
+
+void ast_brige_set_remb_behavior(struct ast_bridge *bridge, enum ast_bridge_video_sfu_remb_behavior behavior)
+{
+	ast_assert(bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU);
+
 	ast_bridge_lock(bridge);
-	bridge->softmix.video_mode.remb_send_interval = remb_send_interval;
+	bridge->softmix.video_mode.mode_data.sfu_data.remb_behavior = behavior;
 	ast_bridge_unlock(bridge);
 }