71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
/* Simple TRAU frame reflector to route voice calls */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/* The "TRAU mux map" defines which particular 16kbit sub-slot (in which E1
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* timeslot on which E1 interface) should be directly muxed to which other
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* sub-slot. Entries in the mux map are always bi-directional.
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*
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* The idea of all this is to directly switch voice channels in the BSC
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* from one phone to another. We do this right now since we don't support
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* any external interface for voice channels, and in the future as an
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* optimization to routing them externally.
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*/
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#include <stdint.h>
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#include <osmocom/msc/gsm_data.h>
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#include <osmocom/msc/mncc.h>
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struct decoded_trau_frame;
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/* map a TRAU mux map entry */
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int trau_mux_map(const struct gsm_e1_subslot *src,
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const struct gsm_e1_subslot *dst);
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int trau_mux_map_lchan(const struct gsm_lchan *src,
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const struct gsm_lchan *dst);
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/* unmap a TRAU mux map entry */
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int trau_mux_unmap(const struct gsm_e1_subslot *ss, uint32_t callref);
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/* we get called by subchan_demux */
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int trau_mux_input(struct gsm_e1_subslot *src_e1_ss,
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const uint8_t *trau_bits, int num_bits);
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/* add a trau receiver */
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int trau_recv_lchan(struct gsm_lchan *lchan, uint32_t callref);
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/* send trau from application */
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int trau_send_frame(struct gsm_lchan *lchan, struct gsm_data_frame *frame);
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/* switch trau muxer to new lchan */
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int switch_trau_mux(struct gsm_lchan *old_lchan, struct gsm_lchan *new_lchan);
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/* callback invoked if we receive TRAU frames */
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int subch_cb(struct subch_demux *dmx, int ch, uint8_t *data, int len, void *_priv);
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/* TRAU frame transcoding */
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struct msgb *trau_decode_fr(uint32_t callref,
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const struct decoded_trau_frame *tf);
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struct msgb *trau_decode_efr(uint32_t callref,
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const struct decoded_trau_frame *tf);
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void trau_encode_fr(struct decoded_trau_frame *tf,
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const unsigned char *data);
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void trau_encode_efr(struct decoded_trau_frame *tf,
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const unsigned char *data);
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