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Added explanatory comment on a recent change.

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This commit is contained in:
Steve Underwood 2014-07-09 10:18:00 +08:00
parent 992debeea4
commit 54b6a0abce
1 changed files with 5 additions and 0 deletions
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5
libs/spandsp/src/t38_gateway.c
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@ -1941,6 +1941,11 @@ static void t38_hdlc_rx_put_bit(hdlc_rx_state_t *t, int new_bit)
if (t->buffer[0] != 0xFF || (t->buffer[1] & 0xEF) != 0x03)
{
/* Abandon the frame, and wait for the next flag octet. */
/* If this is a real frame, where one of these first two octets has a bit
error, we will fail to forward the frame with a CRC error, as we do for
other bad framess. This will affect the timing of what goes forward.
Hopefully such timing changes will have less frequent bad effects than
the consequences of a bad bit stream simulating an HDLC frame start. */
span_log(&s->logging, SPAN_LOG_FLOW, "Bad HDLC frame header. Abandoning frame.\n");
t->flags_seen = t->framing_ok_threshold - 1;
t->len = 0;