[asterisk-bugs] [JIRA] (ASTERISK-28420) In WebRTC video scenario, packet loss lead to freezon video stream.

[Aaron An (JIRA)]

Aaron An created ASTERISK-28420:
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             Summary: In WebRTC video scenario, packet loss lead to freezon  video stream.
                 Key: ASTERISK-28420
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28420
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_srtp
    Affects Versions: 16.3.0
         Environment: CentOS 7.5

            Reporter: Aaron An
            Severity: Critical


In WebRTC video scenario, call from Chrome to asterisk. When network is pool, asterisk reports warnings like "SRTP unprotect failed" "SRTP try to re-create" and then the video is frozen for every, the same time asterisk console report "SRTCP unprotect failed on SSRC xxx" until the call end. I have investigated this issue for several days and find that there is something wrong with the srtp re-create process. The srtp->policy is store in the hash buckets which initialized with 5.  This should change from 5 to 1 to avoid indeterminacy policy order when re-create the srtp session。

in res_srtp.c function res_srtp_new()
srtp->policies = ao2_t_container_alloc_hash(AO2_ALLOC_OPT_LOCK_MUTEX, 0, 5,
		policy_hash_fn, NULL, policy_cmp_fn, "SRTP policy container");



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