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/* Copyright 2019 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdint.h>
#include "cras_audio_codec.h"
/* PLC library provides helper functions to mask the effects of lost or
* disrupted packets. It currentyl only supports the mSBC codec.
*
* This struct contains informations needed for applying the PLC algorithm.
*/
struct cras_msbc_plc;
/* Creates a plc component for mSBC codec, which is used for wideband speech
* mode of HFP
*/
struct cras_msbc_plc *cras_msbc_plc_create();
/* Destroys a mSBC PLC.
* Args:
* plc - The PLC to destroy.
*/
void cras_msbc_plc_destroy(struct cras_msbc_plc *plc);
/* Conceals the packet loss by writing the substitution samples to the ouput
* buffer provided by the caller. The samples will be generated based on the
* informations recorded in the PLC struct passed in.
* Args:
* plc - The PLC you use.
* codec - The mSBC codec.
* output - Pointer to the output buffer.
* Returns:
* The number of bytes written to the output buffer.
*/
int cras_msbc_plc_handle_bad_frames(struct cras_msbc_plc *plc,
struct cras_audio_codec *codec,
uint8_t *output);
/* Updates informations needed and potentially processes the input samples to
* help it to reconverge after a frame loss.
*
* The memory space input and output pointers point to can be overlapping.
* Args:
* plc - The PLC you use.
* input - Pointer to the true input.
* output - Pointer to the output buffer.
* Returns:
* The number of bytes written to the output buffer.
*/
int cras_msbc_plc_handle_good_frames(struct cras_msbc_plc *plc,
const uint8_t *input, uint8_t *output);
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