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/*
* (C) 2014 by On-Waves
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef OPENBSC_MGCP_TRANSCODE_H
#define OPENBSC_MGCP_TRANSCODE_H
#include "bscconfig.h"
#include <gsm.h>
#ifdef HAVE_BCG729
#include <bcg729/decoder.h>
#include <bcg729/encoder.h>
#endif
enum audio_format {
AF_INVALID,
AF_S16,
AF_L16,
AF_GSM,
AF_G729,
AF_PCMA,
AF_PCMU
};
struct mgcp_process_rtp_state {
/* decoding */
enum audio_format src_fmt;
union {
gsm gsm_handle;
#ifdef HAVE_BCG729
bcg729DecoderChannelContextStruct *g729_dec;
#endif
} src;
size_t src_frame_size;
size_t src_samples_per_frame;
/* processing */
/* encoding */
enum audio_format dst_fmt;
union {
gsm gsm_handle;
#ifdef HAVE_BCG729
bcg729EncoderChannelContextStruct *g729_enc;
#endif
} dst;
size_t dst_frame_size;
size_t dst_samples_per_frame;
int dst_packet_duration;
int is_running;
uint16_t next_seq;
uint32_t next_time;
int16_t samples[10*160];
size_t sample_cnt;
size_t sample_offs;
};
int mgcp_transcoding_setup(struct mgcp_endpoint *endp,
struct mgcp_rtp_end *dst_end,
struct mgcp_rtp_end *src_end);
void mgcp_transcoding_net_downlink_format(struct mgcp_endpoint *endp,
int *payload_type,
const char**audio_name,
const char**fmtp_extra);
int mgcp_transcoding_process_rtp(struct mgcp_endpoint *endp,
struct mgcp_rtp_end *dst_end,
char *data, int *len, int buf_size);
int mgcp_transcoding_get_frame_size(void *state_, int nsamples, int dst);
#endif /* OPENBSC_MGCP_TRANSCODE_H */
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