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bridge: Fix stream topology/participant locking and video misrouting.

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This change fixes a few locking issues and some video misrouting.

1. When accessing the stream topology of a channel the channel lock
must be held to guarantee the topology remains valid.

2. When a channel was joined to a bridge the bridge specific
implementation for stream mapping was not invoked, causing video
to be misrouted for a brief period of time.

ASTERISK-27182

Change-Id: I5d2f779248b84d41c5bb3896bf22ba324b336b03
This commit is contained in:
Joshua Colp
2017-08-06 16:15:34 +00:00
parent 2ba29df200
commit 88c65f7cb6
3 changed files with 51 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
bridges/bridge_softmix.c
View File

@@ -577,13 +577,18 @@ static void sfu_topologies_on_join(struct ast_bridge_channel *joiner, struct ast
struct ast_stream_topology *joiner_video = NULL;
struct ast_stream_topology *existing_video = NULL;
struct ast_bridge_channel *participant;
int res;
joiner_video = ast_stream_topology_alloc();
if (!joiner_video) {
return;
}
if (append_source_streams(joiner_video, ast_channel_name(joiner->chan), ast_channel_get_stream_topology(joiner->chan))) {
ast_channel_lock(joiner->chan);
res = append_source_streams(joiner_video, ast_channel_name(joiner->chan), ast_channel_get_stream_topology(joiner->chan));
ast_channel_unlock(joiner->chan);
if (res) {
goto cleanup;
}
@@ -596,13 +601,18 @@ static void sfu_topologies_on_join(struct ast_bridge_channel *joiner, struct ast
if (participant == joiner) {
continue;
}
if (append_source_streams(existing_video, ast_channel_name(participant->chan),
ast_channel_get_stream_topology(participant->chan))) {
ast_channel_lock(participant->chan);
res = append_source_streams(existing_video, ast_channel_name(participant->chan),
ast_channel_get_stream_topology(participant->chan));
ast_channel_unlock(participant->chan);
if (res) {
goto cleanup;
}
}
ast_channel_lock(joiner->chan);
joiner_topology = ast_stream_topology_clone(ast_channel_get_stream_topology(joiner->chan));
ast_channel_unlock(joiner->chan);
if (!joiner_topology) {
goto cleanup;
}
@@ -617,7 +627,9 @@ static void sfu_topologies_on_join(struct ast_bridge_channel *joiner, struct ast
if (participant == joiner) {
continue;
}
ast_channel_lock(participant->chan);
participant_topology = ast_stream_topology_clone(ast_channel_get_stream_topology(participant->chan));
ast_channel_unlock(participant->chan);
if (!participant_topology) {
goto cleanup;
}
@@ -753,12 +765,16 @@ static int sfu_topologies_on_leave(struct ast_bridge_channel *leaver, struct ast
continue;
}
ast_channel_lock(participant->chan);
remove_destination_streams(participant_topology, ast_channel_name(leaver->chan), ast_channel_get_stream_topology(participant->chan));
ast_channel_unlock(participant->chan);
ast_channel_request_stream_topology_change(participant->chan, participant_topology, NULL);
ast_stream_topology_free(participant_topology);
}
ast_channel_lock(leaver->chan);
remove_destination_streams(leaver_topology, "", ast_channel_get_stream_topology(leaver->chan));
ast_channel_unlock(leaver->chan);
ast_channel_request_stream_topology_change(leaver->chan, leaver_topology, NULL);
ast_stream_topology_free(leaver_topology);
@@ -1657,6 +1673,7 @@ static void map_source_to_destinations(const char *source_stream_name, const cha
}
ast_bridge_channel_lock(participant);
ast_channel_lock(participant->chan);
topology = ast_channel_get_stream_topology(participant->chan);
for (i = 0; i < ast_stream_topology_get_count(topology); ++i) {
@@ -1668,6 +1685,7 @@ static void map_source_to_destinations(const char *source_stream_name, const cha
break;
}
}
ast_channel_unlock(participant->chan);
ast_bridge_channel_unlock(participant);
}
}
@@ -1702,16 +1720,9 @@ static void softmix_bridge_stream_topology_changed(struct ast_bridge *bridge, st
/* First traversal: re-initialize all of the participants' stream maps */
AST_LIST_TRAVERSE(&bridge->channels, participant, entry) {
int size;
ast_bridge_channel_lock(participant);
size = ast_stream_topology_get_count(ast_channel_get_stream_topology(participant->chan));
AST_VECTOR_FREE(&participant->stream_map.to_channel);
AST_VECTOR_FREE(&participant->stream_map.to_bridge);
AST_VECTOR_INIT(&participant->stream_map.to_channel, size);
AST_VECTOR_INIT(&participant->stream_map.to_bridge, size);
AST_VECTOR_RESET(&participant->stream_map.to_channel, AST_VECTOR_ELEM_CLEANUP_NOOP);
AST_VECTOR_RESET(&participant->stream_map.to_bridge, AST_VECTOR_ELEM_CLEANUP_NOOP);
ast_bridge_channel_unlock(participant);
}
@@ -1727,6 +1738,8 @@ static void softmix_bridge_stream_topology_changed(struct ast_bridge *bridge, st
int i;
struct ast_stream_topology *topology;
ast_channel_lock(participant->chan);
topology = ast_channel_get_stream_topology(participant->chan);
for (i = 0; i < ast_stream_topology_get_count(topology); ++i) {
@@ -1766,6 +1779,8 @@ static void softmix_bridge_stream_topology_changed(struct ast_bridge *bridge, st
}
ast_bridge_channel_unlock(participant);
}
ast_channel_unlock(participant->chan);
}
}

5
main/bridge.c
View File

@@ -446,7 +446,12 @@ static void bridge_channel_complete_join(struct ast_bridge *bridge, struct ast_b
* media types vector. This way all streams map to the same media type index for
* a given channel.
*/
if (bridge_channel->bridge->technology->stream_topology_changed) {
bridge_channel->bridge->technology->stream_topology_changed(
bridge_channel->bridge, bridge_channel);
} else {
ast_bridge_channel_stream_map(bridge_channel);
}
}
/*!

25
main/bridge_channel.c
View File

@@ -2344,16 +2344,23 @@ static void bridge_channel_handle_write(struct ast_bridge_channel *bridge_channe
case AST_FRAME_NULL:
break;
default:
if (fr->stream_num > 0 &&
(fr->stream_num >= (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_channel) ||
AST_VECTOR_GET(&bridge_channel->stream_map.to_channel, fr->stream_num) == -1)) {
/* Nowhere to write to, so drop it */
/* Assume that there is no mapped stream for this */
num = -1;
if (fr->stream_num > -1) {
ast_bridge_channel_lock(bridge_channel);
if (fr->stream_num < (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_channel)) {
num = AST_VECTOR_GET(&bridge_channel->stream_map.to_channel, fr->stream_num);
}
ast_bridge_channel_unlock(bridge_channel);
/* If there is no mapped stream after checking the mapping then there is nowhere
* to write this frame to, so drop it.
*/
if (num == -1) {
break;
}
/* Find what stream number to write to for the channel */
num = fr->stream_num < 0 ? -1 :
AST_VECTOR_GET(&bridge_channel->stream_map.to_channel, fr->stream_num);
}
/* Write the frame to the channel. */
bridge_channel->activity = BRIDGE_CHANNEL_THREAD_SIMPLE;
@@ -2983,7 +2990,9 @@ struct ast_bridge_channel *bridge_channel_internal_alloc(struct ast_bridge *brid
void ast_bridge_channel_stream_map(struct ast_bridge_channel *bridge_channel)
{
ast_channel_lock(bridge_channel->chan);
ast_stream_topology_map(ast_channel_get_stream_topology(bridge_channel->chan),
&bridge_channel->bridge->media_types, &bridge_channel->stream_map.to_bridge,
&bridge_channel->stream_map.to_channel);
ast_channel_unlock(bridge_channel->chan);
}