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/*
* (C) 2017-2018 by Vadim Yanitskiy <axilirator@gmail.com>
* (C) 2022-2024 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 <stdint.h>
#include <errno.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gsm/protocol/gsm_04_08.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/transaction.h>
#include <osmocom/bb/mobile/tch.h>
/* Forward a Downlink voice frame to the external MNCC handler */
static int tch_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;
}
int tch_voice_recv(struct osmocom_ms *ms, struct msgb *msg)
{
struct tch_voice_state *state = &ms->tch_state->voice;
switch (state->handler) {
case TCH_VOICE_IOH_LOOPBACK:
/* Remove the DL info header */
msgb_pull_to_l2(msg);
/* Send voice frame back */
return tch_send_msg(ms, msg);
case TCH_VOICE_IOH_MNCC_SOCK:
return tch_forward_mncc(ms, msg);
case TCH_VOICE_IOH_GAPK:
#ifdef WITH_GAPK_IO
/* Enqueue a frame to the DL TCH buffer */
if (state->gapk_io != NULL)
gapk_io_enqueue_dl(state->gapk_io, msg);
else
msgb_free(msg);
break;
#endif
case TCH_VOICE_IOH_L1PHY:
case TCH_VOICE_IOH_NONE:
/* Drop voice frame */
msgb_free(msg);
break;
}
return 0;
}
int tch_voice_serve_ms(struct osmocom_ms *ms)
{
#ifdef WITH_GAPK_IO
struct tch_voice_state *state = &ms->tch_state->voice;
if (state->handler == TCH_VOICE_IOH_GAPK)
return gapk_io_serve_ms(ms, state->gapk_io);
#endif
return 0;
}
int tch_voice_state_init(struct gsm_trans *trans, struct tch_voice_state *state)
{
#ifdef WITH_GAPK_IO
struct osmocom_ms *ms = trans->ms;
const struct gsm48_rr_cd *cd = &ms->rrlayer.cd_now;
switch (state->handler) {
case TCH_VOICE_IOH_GAPK:
if ((cd->chan_nr & RSL_CHAN_NR_MASK) == RSL_CHAN_Bm_ACCHs)
state->gapk_io = gapk_io_state_alloc_mode_rate(ms, cd->mode, true);
else /* RSL_CHAN_Lm_ACCHs */
state->gapk_io = gapk_io_state_alloc_mode_rate(ms, cd->mode, false);
if (state->gapk_io == NULL)
return -1;
break;
default:
break;
}
#endif
return 0;
}
void tch_voice_state_free(struct tch_voice_state *state)
{
switch (state->handler) {
#ifdef WITH_GAPK_IO
case TCH_VOICE_IOH_GAPK:
gapk_io_state_free(state->gapk_io);
break;
#endif
default:
break;
}
}
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