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osmo-msc
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Add RTP support for EFR 

This is just the minimal support to receive and send EFR codec
RTP frames.

We are missing the code to convert TRAU frames in EFR format!
This commit is contained in:
Harald Welte 2009-12-19 23:06:41 +01:00
parent da7ab74298
commit aca8f158bc
3 changed files with 11 additions and 1 deletions
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1
openbsc/include/openbsc/mncc.h
View File

@ -88,6 +88,7 @@ struct gsm_call {
#define MNCC_LCHAN_MODIFY 0x0203
#define GSM_TCHF_FRAME 0x0300
#define GSM_TCHF_FRAME_EFR 0x0301
#define GSM_MAX_FACILITY 128
#define GSM_MAX_SSVERSION 128

2
openbsc/src/mncc.c
View File

@ -83,7 +83,7 @@ static struct mncc_names {
{"MNCC_FRAME_DROP", 0x0202},
{"MNCC_LCHAN_MODIFY", 0x0203},
{"GSM_TRAU_FRAME", 0x0300},
{"GSM_TCH_FRAME", 0x0300},
{NULL, 0} };

9
openbsc/src/rtp_proxy.c
View File

@ -82,6 +82,7 @@ struct rtp_x_hdr {
#define RTP_VERSION 2
#define RTP_PT_GSM_FULL 3
#define RTP_PT_GSM_EFR 97
/* decode an rtp frame and create a new buffer with payload */
static int rtp_decode(struct msgb *msg, u_int32_t callref, struct msgb **data)
@ -152,6 +153,9 @@ static int rtp_decode(struct msgb *msg, u_int32_t callref, struct msgb **data)
return -EINVAL;
}
break;
case RTP_PT_GSM_EFR:
msg_type = GSM_TCHF_FRAME_EFR;
break;
default:
DEBUGPC(DMUX, "received RTP frame with unknown payload "
"type %d\n", rtph->payload_type);
@ -196,6 +200,11 @@ int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame)
payload_len = 33;
duration = 160;
break;
case GSM_TCHF_FRAME_EFR:
payload_type = RTP_PT_GSM_EFR;
payload_len = 31;
duration = 160;
break;
default:
DEBUGPC(DMUX, "unsupported message type %d\n",
frame->msg_type);