app_confbridge/bridge_softmix: Add ability to force estimated bitrate

app_confbridge now has the ability to set the estimated bitrate on an
SFU bridge.  To use it, set a bridge profile's remb_behavior to "force"
and set remb_estimated_bitrate to a rate in bits per second.  The
remb_estimated_bitrate parameter is ignored if remb_behavior is something
other than "force".

Change-Id: Idce6464ff014a37ea3b82944452e56cc4d75ab0a

diff --git a/apps/app_confbridge.c b/apps/app_confbridge.c
index fca0ed6ef21f9a4651f3c3b8ff862fc38b31de0a..8ad188a5d8c4daab6b156fe04a1819f8df632198 100644 (file)
--- a/apps/app_confbridge.c
+++ b/apps/app_confbridge.c
@@ -1730,6 +1730,9 @@ static struct confbridge_conference *join_conference_bridge(const char *conferen
                                ast_brige_set_remb_behavior(conference->bridge, AST_BRIDGE_VIDEO_SFU_REMB_LOWEST_ALL);
                        } else if (ast_test_flag(&conference->b_profile, BRIDGE_OPT_REMB_BEHAVIOR_HIGHEST_ALL)) {
                                ast_brige_set_remb_behavior(conference->bridge, AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST_ALL);
+                       } else if (ast_test_flag(&conference->b_profile, BRIDGE_OPT_REMB_BEHAVIOR_FORCE)) {
+                               ast_brige_set_remb_behavior(conference->bridge, AST_BRIDGE_VIDEO_SFU_REMB_FORCE);
+                               ast_bridge_set_remb_estimated_bitrate(conference->bridge, conference->b_profile.remb_estimated_bitrate);
                        }
                }
 

diff --git a/apps/confbridge/conf_config_parser.c b/apps/confbridge/conf_config_parser.c
index 3814d30d69879243ccb075d662d710af1e13dbf2..656acc650f4bcc02ea5b7f2e261bca7635970d46 100644 (file)
--- a/apps/confbridge/conf_config_parser.c
+++ b/apps/confbridge/conf_config_parser.c
@@ -533,8 +533,22 @@
                                                                <para>The highest estimated maximum bitrate of all receivers in the bridge
                                                                is taken and sent to each sender.</para>
                                                        </enum>
+                                                       <enum name="force">
+                                                               <para>The bitrate configured in <literal>remb_estimated_bitrate</literal>
+                                                               is sent to each sender.</para>
+                                                       </enum>
                                                </enumlist>
                                        </description>
+                                       <see-also><ref type="configOption">remb_estimated_bitrate</ref></see-also>
+                               </configOption>
+                               <configOption name="remb_estimated_bitrate">
+                                       <synopsis>Sets the estimated bitrate sent to each participant in REMB reports</synopsis>
+                                       <description><para>
+                                           When <literal>remb_behavior</literal> is set to <literal>force</literal>,
+                                           this options sets the estimated bitrate (in bits per second) sent to each participant
+                                           in REMB reports.
+                                       </para></description>
+                                       <see-also><ref type="configOption">remb_behavior</ref></see-also>
                                </configOption>
                                <configOption name="enable_events" default="no">
                                        <synopsis>Enables events for this bridge</synopsis>
@@ -2159,7 +2173,9 @@ static int remb_behavior_handler(const struct aco_option *opt, struct ast_variab
                BRIDGE_OPT_REMB_BEHAVIOR_HIGHEST |
                BRIDGE_OPT_REMB_BEHAVIOR_AVERAGE_ALL |
                BRIDGE_OPT_REMB_BEHAVIOR_LOWEST_ALL |
-               BRIDGE_OPT_REMB_BEHAVIOR_HIGHEST_ALL);
+               BRIDGE_OPT_REMB_BEHAVIOR_HIGHEST_ALL |
+               BRIDGE_OPT_REMB_BEHAVIOR_FORCE
+               );
 
        if (!strcasecmp(var->value, "average")) {
                ast_set_flag(b_profile, BRIDGE_OPT_REMB_BEHAVIOR_AVERAGE);
@@ -2173,6 +2189,8 @@ static int remb_behavior_handler(const struct aco_option *opt, struct ast_variab
                ast_set_flag(b_profile, BRIDGE_OPT_REMB_BEHAVIOR_LOWEST_ALL);
        } else if (!strcasecmp(var->value, "highest_all")) {
                ast_set_flag(b_profile, BRIDGE_OPT_REMB_BEHAVIOR_HIGHEST_ALL);
+       } else if (!strcasecmp(var->value, "force")) {
+               ast_set_flag(b_profile, BRIDGE_OPT_REMB_BEHAVIOR_FORCE);
        } else {
                return -1;
        }
@@ -2419,6 +2437,7 @@ int conf_load_config(void)
        aco_option_register(&cfg_info, "video_update_discard", ACO_EXACT, bridge_types, "2000", OPT_UINT_T, 0, FLDSET(struct bridge_profile, video_update_discard));
        aco_option_register(&cfg_info, "remb_send_interval", ACO_EXACT, bridge_types, "0", OPT_UINT_T, 0, FLDSET(struct bridge_profile, remb_send_interval));
        aco_option_register_custom(&cfg_info, "remb_behavior", ACO_EXACT, bridge_types, "average", remb_behavior_handler, 0);
+       aco_option_register(&cfg_info, "remb_estimated_bitrate", ACO_EXACT, bridge_types, "0", OPT_UINT_T, 0, FLDSET(struct bridge_profile, remb_estimated_bitrate));
        aco_option_register(&cfg_info, "enable_events", ACO_EXACT, bridge_types, "no", OPT_BOOLFLAG_T, 1, FLDSET(struct bridge_profile, flags), BRIDGE_OPT_ENABLE_EVENTS);
        /* This option should only be used with the CONFBRIDGE dialplan function */
        aco_option_register_custom(&cfg_info, "template", ACO_EXACT, bridge_types, NULL, bridge_template_handler, 0);

diff --git a/apps/confbridge/include/confbridge.h b/apps/confbridge/include/confbridge.h
index e48292a0ba155a5f21e9d4e33dc2c9976a12d735..f4133593578cd446b9a7c25867122a987beb35ae 100644 (file)
--- a/apps/confbridge/include/confbridge.h
+++ b/apps/confbridge/include/confbridge.h
@@ -87,6 +87,7 @@ enum bridge_profile_flags {
        BRIDGE_OPT_REMB_BEHAVIOR_AVERAGE_ALL = (1 << 12), /*!< The average of all REMB reports in the entire bridge is sent to each sender */
        BRIDGE_OPT_REMB_BEHAVIOR_LOWEST_ALL = (1 << 13), /*!< The lowest estimated maximum bitrate from all receivers is sent to each sender */
        BRIDGE_OPT_REMB_BEHAVIOR_HIGHEST_ALL = (1 << 14), /*!< The highest estimated maximum bitrate from all receivers is sent to each sender */
+       BRIDGE_OPT_REMB_BEHAVIOR_FORCE = (1 << 15), /*!< Force the REMB estimated bitrate to that specifiec in remb_estimated_bitrate */
 };
 
 enum conf_menu_action_id {
@@ -235,6 +236,7 @@ struct bridge_profile {
        char regcontext[AST_MAX_CONTEXT];
        unsigned int video_update_discard; /*!< Amount of time after sending a video update request that subsequent requests should be discarded */
        unsigned int remb_send_interval; /*!< Interval at which a combined REMB frame is sent to video sources */
+       unsigned int remb_estimated_bitrate; /*!< Bitrate sent when BRIDGE_OPT_REMB_BEHAVIOR_FORCE is set */
 };
 
 /*! \brief The structure that represents a conference bridge */

diff --git a/bridges/bridge_softmix.c b/bridges/bridge_softmix.c
index 5acd7943b09e15484084bea7d20d7b5349dd1258..d51a55f7d1f59ac5bf6ed7fe4558df80c0cd1d01 100644 (file)
--- a/bridges/bridge_softmix.c
+++ b/bridges/bridge_softmix.c
@@ -1396,6 +1396,7 @@ static void remb_collect_report_all(struct ast_bridge *bridge, struct softmix_br
        case AST_BRIDGE_VIDEO_SFU_REMB_AVERAGE:
        case AST_BRIDGE_VIDEO_SFU_REMB_LOWEST:
        case AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST:
+       case AST_BRIDGE_VIDEO_SFU_REMB_FORCE:
                /* These will never actually get hit due to being handled by remb_collect_report below */
                break;
        }
@@ -1417,6 +1418,12 @@ static void remb_collect_report(struct ast_bridge *bridge, struct ast_bridge_cha
        /* We evenly divide the available maximum bitrate across the video sources
         * to this receiver so each source gets an equal slice.
         */
+
+       if (bridge->softmix.video_mode.mode_data.sfu_data.remb_behavior == AST_BRIDGE_VIDEO_SFU_REMB_FORCE) {
+               softmix_data->bitrate = bridge->softmix.video_mode.mode_data.sfu_data.estimated_bitrate;
+               return;
+       }
+
        bitrate = (sc->remb.br_mantissa << sc->remb.br_exp) / AST_VECTOR_SIZE(&sc->video_sources);
 
        /* If this receiver has no bitrate yet ignore it */
@@ -1462,6 +1469,9 @@ static void remb_collect_report(struct ast_bridge *bridge, struct ast_bridge_cha
                case AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST_ALL:
                        /* These will never actually get hit due to being handled by remb_collect_report_all above */
                        break;
+               case AST_BRIDGE_VIDEO_SFU_REMB_FORCE:
+                       /* Don't do anything, we've already forced it */
+                       break;
                }
        }
 

diff --git a/configs/samples/confbridge.conf.sample b/configs/samples/confbridge.conf.sample
index 02edaa538ddeb3ed78c6ff6446724d74148b9815..7749c93ef7827cf2f3155e404ec8d133eca1213b 100644 (file)
--- a/configs/samples/confbridge.conf.sample
+++ b/configs/samples/confbridge.conf.sample
@@ -264,8 +264,11 @@ type=bridge
                            ; the highest maximum bitrate is forwarded to the sender. If set to "average_all" a single average
                            ; is generated from every receiver and the same value is sent to every sender. If set to
                            ; "lowest_all" the lowest maximum bitrate of all receivers is sent to every sender. If set to
-                           ; "highest_all" the highest maximum bitrate of all receivers is sent to every sender. This
-                           ; defaults to "average".
+                           ; "highest_all" the highest maximum bitrate of all receivers is sent to every sender.
+                           ; When set to "force", the value set in remb_estimated_bitrate is sent to every sender.
+                           ; This defaults to "average".
+;remb_estimated_bitrate=0  ; When remb_behavior is set to 'force', this options sets the estimated bitrate
+                           ; (in bits per second) sent to each participant in REMB reports.
 
 ;enable_events=no          ; If enabled, recipients who joined the bridge via a channel driver
                            ; that supports Enhanced Messaging (currently only chan_pjsip) will

diff --git a/doc/CHANGES-staging/app_confbridge.txt b/doc/CHANGES-staging/app_confbridge.txt
new file mode 100644 (file)
index 0000000..092e392
--- /dev/null
+++ b/doc/CHANGES-staging/app_confbridge.txt
@@ -0,0 +1,7 @@
+Subject: app_confbridge
+
+app_confbridge now has the ability to force the estimated bitrate on an SFU
+bridge.  To use it, set a bridge profile's remb_behavior to "force" and
+set remb_estimated_bitrate to a rate in bits per second.  The
+remb_estimated_bitrate parameter is ignored if remb_behavior is something
+other than "force".

diff --git a/include/asterisk/bridge.h b/include/asterisk/bridge.h
index a0aa4c5d7689697909588de1f49d38726feb22da..6a7a3956358178166f64921ba3de49d655c4802f 100644 (file)
--- a/include/asterisk/bridge.h
+++ b/include/asterisk/bridge.h
@@ -141,6 +141,8 @@ enum ast_bridge_video_sfu_remb_behavior {
        AST_BRIDGE_VIDEO_SFU_REMB_LOWEST_ALL,
        /*! The highest reported bitrate from all channels in the bridge is forwarded to each sender */
        AST_BRIDGE_VIDEO_SFU_REMB_HIGHEST_ALL,
+       /*! Force the REMB estimated bitrate to a specified value */
+       AST_BRIDGE_VIDEO_SFU_REMB_FORCE,
 };
 
 /*! \brief This is used for selective forwarding unit configuration */
@@ -149,6 +151,8 @@ struct ast_bridge_video_sfu_data {
        unsigned int remb_send_interval;
        /*! How the combined REMB report is generated */
        enum ast_bridge_video_sfu_remb_behavior remb_behavior;
+       /*! The estimated bitrate when behavior is "force" */
+       float estimated_bitrate;
 };
 
 /*! \brief Data structure that defines a video source mode */
@@ -1039,6 +1043,16 @@ void ast_bridge_set_remb_send_interval(struct ast_bridge *bridge, unsigned int r
  */
 void ast_brige_set_remb_behavior(struct ast_bridge *bridge, enum ast_bridge_video_sfu_remb_behavior behavior);
 
+/*!
+ * \brief Force the REMB report estimated bitrate to a specific max value
+ *
+ * \param bridge Bridge to set the REMB behavior on
+ * \param estimated_bitrate The estimated bitrate in bits per second
+ *
+ * \note This can only be called when the bridge has been set to the SFU video mode.
+ */
+void ast_bridge_set_remb_estimated_bitrate(struct ast_bridge *bridge, float estimated_bitrate);
+
 /*!
  * \brief Update information about talker energy for talker src video mode.
  */

diff --git a/main/bridge.c b/main/bridge.c
index d44f6596e250322f12408a948992891d73754605..05380085d3d36a7dbdd405ba2274a97fbf0c54e4 100644 (file)
--- a/main/bridge.c
+++ b/main/bridge.c
@@ -3871,6 +3871,15 @@ void ast_brige_set_remb_behavior(struct ast_bridge *bridge, enum ast_bridge_vide
        ast_bridge_unlock(bridge);
 }
 
+void ast_bridge_set_remb_estimated_bitrate(struct ast_bridge *bridge, float estimated_bitrate)
+{
+       ast_assert(bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU);
+
+       ast_bridge_lock(bridge);
+       bridge->softmix.video_mode.mode_data.sfu_data.estimated_bitrate = estimated_bitrate;
+       ast_bridge_unlock(bridge);
+}
+
 void ast_bridge_update_talker_src_video_mode(struct ast_bridge *bridge, struct ast_channel *chan, int talker_energy, int is_keyframe)
 {
        struct ast_bridge_video_talker_src_data *data;