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/*
* (C) 2010 by Andreas Eversberg <jolly@eversberg.eu>
* (C) 2017-2018 by Vadim Yanitskiy <axilirator@gmail.com>
* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <string.h>
#include <errno.h>
#include <osmocom/core/msgb.h>
#include <osmocom/codec/codec.h>
#include <osmocom/gsm/protocol/gsm_08_58.h>
#include <osmocom/bb/common/logging.h>
#include <osmocom/bb/common/osmocom_data.h>
#include <osmocom/bb/common/ms.h>
#include <osmocom/bb/mobile/gapk_io.h>
#include <osmocom/bb/mobile/mncc.h>
#include <osmocom/bb/mobile/mncc_sock.h>
#include <osmocom/bb/mobile/voice.h>
/* Forward a Downlink voice frame to the external MNCC handler */
static int gsm_forward_mncc(struct osmocom_ms *ms, struct msgb *msg)
{
struct gsm_data_frame *mncc;
/* Drop the l1ctl_info_dl header */
msgb_pull_to_l2(msg);
/* push mncc header in front of data */
mncc = (struct gsm_data_frame *)
msgb_push(msg, sizeof(struct gsm_data_frame));
mncc->callref = ms->mncc_entity.ref;
switch (ms->rrlayer.cd_now.mode) {
case GSM48_CMODE_SPEECH_V1:
{
const uint8_t cbits = ms->rrlayer.cd_now.chan_nr >> 3;
if (cbits == ABIS_RSL_CHAN_NR_CBITS_Bm_ACCHs)
mncc->msg_type = GSM_TCHF_FRAME;
else
mncc->msg_type = GSM_TCHH_FRAME;
break;
}
case GSM48_CMODE_SPEECH_EFR:
mncc->msg_type = GSM_TCHF_FRAME_EFR;
break;
case GSM48_CMODE_SPEECH_AMR: /* TODO: no AMR support yet */
default:
/* TODO: print error message here */
goto exit_free;
}
/* distribute and then free */
if (ms->mncc_entity.sock_state && ms->mncc_entity.ref)
return mncc_sock_from_cc(ms->mncc_entity.sock_state, msg);
exit_free:
msgb_free(msg);
return 0;
}
/* Receive a Downlink voice frame from the lower layers */
static int gsm_recv_voice(struct osmocom_ms *ms, struct msgb *msg)
{
switch (ms->settings.audio.io_handler) {
case AUDIO_IOH_LOOPBACK:
/* Send voice frame back */
return gsm_send_voice_msg(ms, msg);
case AUDIO_IOH_MNCC_SOCK:
return gsm_forward_mncc(ms, msg);
case AUDIO_IOH_GAPK:
#ifdef WITH_GAPK_IO
/* Enqueue a frame to the DL TCH buffer */
if (ms->gapk_io != NULL)
gapk_io_enqueue_dl(ms->gapk_io, msg);
else
msgb_free(msg);
break;
#endif
case AUDIO_IOH_L1PHY:
case AUDIO_IOH_NONE:
/* Drop voice frame */
msgb_free(msg);
}
return 0;
}
/* Send an Uplink voice frame to the lower layers */
int gsm_send_voice_msg(struct osmocom_ms *ms, struct msgb *msg)
{
/* Forward to RR */
return gsm48_rr_tx_voice(ms, msg);
}
/* gsm_send_voice_msg() wrapper accepting an MNCC structure */
int gsm_send_voice_frame(struct osmocom_ms *ms, const struct gsm_data_frame *frame)
{
struct msgb *nmsg;
int len;
switch (frame->msg_type) {
case GSM_TCHF_FRAME:
len = GSM_FR_BYTES;
break;
case GSM_TCHF_FRAME_EFR:
len = GSM_EFR_BYTES;
break;
case GSM_TCHH_FRAME:
len = GSM_HR_BYTES;
break;
/* TODO: case GSM_TCH_FRAME_AMR (variable length) */
/* TODO: case GSM_BAD_FRAME (empty?) */
default:
LOGP(DL1C, LOGL_ERROR, "%s(): msg_type=0x%02x: not implemented\n",
__func__, frame->msg_type);
return -EINVAL;
}
nmsg = msgb_alloc_headroom(len + 64, 64, "TCH/F");
if (!nmsg)
return -ENOMEM;
nmsg->l2h = msgb_put(nmsg, len);
memcpy(nmsg->l2h, frame->data, len);
return gsm_send_voice_msg(ms, nmsg);
}
/* Initialize voice router */
int gsm_voice_init(struct osmocom_ms *ms)
{
ms->l1_entity.l1_traffic_ind = gsm_recv_voice;
return 0;
}
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