chan_pjsip: Fix an assertion for channels that lack formats on creation

ASTERISK-24222 #close
Reported by: Mark Michelson
Review: https://reviewboard.asterisk.org/r/4017/
........

Merged revisions 424333 from http://svn.asterisk.org/svn/asterisk/branches/13

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@424358 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_pjsip.c b/channels/chan_pjsip.c
index b8fb35c35839f82f4613c109e7f1f3757dba8fb3..015cd6448495c69ea59d9ea95258b05822b47145 100644 (file)
--- a/channels/chan_pjsip.c
+++ b/channels/chan_pjsip.c
@@ -371,7 +371,6 @@ static struct ast_channel *chan_pjsip_new(struct ast_sip_session *session, int s
 {
        struct ast_channel *chan;
        struct ast_format_cap *caps;
-       struct ast_format *fmt;
        RAII_VAR(struct chan_pjsip_pvt *, pvt, NULL, ao2_cleanup);
        struct ast_sip_channel_pvt *channel;
        struct ast_variable *var;
@@ -418,16 +417,20 @@ static struct ast_channel *chan_pjsip_new(struct ast_sip_session *session, int s
 
        ast_channel_nativeformats_set(chan, caps);
 
-       /*
-        * XXX Probably should pick the first audio codec instead
-        * of simply the first codec.  The first codec may be video.
-        */
-       fmt = ast_format_cap_get_format(caps, 0);
-       ast_channel_set_writeformat(chan, fmt);
-       ast_channel_set_rawwriteformat(chan, fmt);
-       ast_channel_set_readformat(chan, fmt);
-       ast_channel_set_rawreadformat(chan, fmt);
-       ao2_ref(fmt, -1);
+       if (!ast_format_cap_empty(caps)) {
+               /*
+                * XXX Probably should pick the first audio codec instead
+                * of simply the first codec.  The first codec may be video.
+                */
+               struct ast_format *fmt = ast_format_cap_get_format(caps, 0);
+
+               ast_channel_set_writeformat(chan, fmt);
+               ast_channel_set_rawwriteformat(chan, fmt);
+               ast_channel_set_readformat(chan, fmt);
+               ast_channel_set_rawreadformat(chan, fmt);
+               ao2_ref(fmt, -1);
+       }
+
        ao2_ref(caps, -1);
 
        if (state == AST_STATE_RING) {