srtpdec: fix reseting RTP sequence number on ROC changes
Each srtp_stream_t is tied to an specific SSRC, so a roc_changed flag should be kept per each SSRC in order to properly reset RTP sequence number on ROC changes.
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Each srtp_stream_t is tied to an specific SSRC, so a roc_changed flag should be kept per each SSRC in order to properly reset RTP sequence number on ROC changes.