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#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <osmocom/codec/codec.h>
/* Codec independent ECU state */
struct osmo_ecu_fr_state {
bool subsequent_lost_frame;
uint8_t frame_backup[GSM_FR_BYTES];
};
void osmo_ecu_fr_reset(struct osmo_ecu_fr_state *state, const uint8_t *frame);
int osmo_ecu_fr_conceal(struct osmo_ecu_fr_state *state, uint8_t *frame);
enum osmo_ecu_codec {
OSMO_ECU_CODEC_HR,
OSMO_ECU_CODEC_FR,
OSMO_ECU_CODEC_EFR,
OSMO_ECU_CODEC_AMR,
_NUM_OSMO_ECU_CODECS
};
/***********************************************************************
* Generic ECU abstraction layer below
***********************************************************************/
/* As the developer and copyright holder of the related code, I hereby
* state that any ECU implementation using 'struct osmo_ecu_ops' and
* registering with the 'osmo_ecu_register()' function shall not be
* considered as a derivative work under any applicable copyright law;
* the copyleft terms of GPLv2 shall hence not apply to any such ECU
* implementation.
*
* The intent of the above exception is to allow anyone to combine third
* party Error Concealment Unit implementations with libosmocodec.
* including but not limited to such published by ETSI.
*
* -- Harald Welte <laforge@gnumonks.org> on August 1, 2019.
*/
struct osmo_ecu_state {
enum osmo_ecu_codec codec;
uint8_t data[0];
};
/* initialize an ECU instance */
struct osmo_ecu_state *osmo_ecu_init(void *ctx, enum osmo_ecu_codec codec);
/* destroy an ECU instance */
void osmo_ecu_destroy(struct osmo_ecu_state *st);
/* process a received frame a substitute/erroneous frame */
int osmo_ecu_frame_in(struct osmo_ecu_state *st, bool bfi,
const uint8_t *frame, unsigned int frame_bytes);
/* generate output data for a substitute/erroneous frame */
int osmo_ecu_frame_out(struct osmo_ecu_state *st, uint8_t *frame_out);
struct osmo_ecu_ops {
struct osmo_ecu_state * (*init)(void *ctx, enum osmo_ecu_codec codec);
void (*destroy)(struct osmo_ecu_state *);
int (*frame_in)(struct osmo_ecu_state *st, bool bfi,
const uint8_t *frame, unsigned int frame_bytes);
int (*frame_out)(struct osmo_ecu_state *st, uint8_t *frame_out);
};
int osmo_ecu_register(const struct osmo_ecu_ops *ops, enum osmo_ecu_codec codec);
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