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rtp: Add handling of BFI (Bad Frame Indicatior) of received TRAU frames 

If a bad TRAU frame is received, it is forwarded to MNCC application
as GSM_BAD_FRAME. The application can now handle the GAP of missing
audio. (e.g. by extrapolation)

If TRAU frames are forwarded via RTP, bad frames are dropped, but frame
counter and timestamp of RTP sender state is incremented.

Conflicts:
	openbsc/src/libtrau/rtp_proxy.c

[hfreyther: Merge without testcase, fix typo]
This commit is contained in:
Andreas Eversberg 2012-01-20 20:33:37 +01:00 committed by Holger Hans Peter Freyther
parent cea35aecdc
commit 9967a57587
2 changed files with 18 additions and 1 deletions
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14
openbsc/src/libtrau/rtp_proxy.c
View File

@ -206,6 +206,7 @@ int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame)
int payload_type;
int payload_len;
int duration; /* in samples */
int is_bfi = 0;
if (rs->tx_action != RTP_SEND_DOWNSTREAM) {
/* initialize sequences */
@ -236,6 +237,12 @@ int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame)
payload_len = frame->data[0];
duration = RTP_GSM_DURATION;
break;
case GSM_BAD_FRAME:
payload_type = 0;
payload_len = 0;
duration = RTP_GSM_DURATION;
is_bfi = 1;
break;
default:
DEBUGPC(DLMUX, "unsupported message type %d\n",
frame->msg_type);
@ -248,6 +255,13 @@ int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame)
return -EINVAL;
}
if (is_bfi) {
/* In case of a bad frame, just count and drop packet. */
rs->transmit.timestamp += duration;
rs->transmit.sequence++;
return 0;
}
msg = msgb_alloc(sizeof(struct rtp_hdr) + payload_len, "RTP-GSM");
if (!msg)
return -ENOMEM;

5
openbsc/src/libtrau/trau_mux.c
View File

@ -245,7 +245,10 @@ struct msgb *trau_decode_fr(uint32_t callref,
i++;
j++;
}
frame->msg_type = GSM_TCHF_FRAME;
if (tf->c_bits[11]) /* BFI */
frame->msg_type = GSM_BAD_FRAME;
else
frame->msg_type = GSM_TCHF_FRAME;
frame->callref = callref;
msgb_put(msg, sizeof(struct gsm_data_frame) + 33);