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/******************************************************************************
*
* Copyright 2022 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#ifndef __LC3_SNS_H
#define __LC3_SNS_H
#include "common.h"
#include "bits.h"
/**
* Bitstream data
*/
typedef struct lc3_sns_data {
int lfcb, hfcb;
int shape, gain;
int idx_a, idx_b;
bool ls_a, ls_b;
} lc3_sns_data_t;
/* ----------------------------------------------------------------------------
* Encoding
* -------------------------------------------------------------------------- */
/**
* SNS analysis
* dt, sr Duration and samplerate of the frame
* nbytes Size in bytes of the frame
* eb Energy estimation per bands, and count of bands
* att 1: Attack detected 0: Otherwise
* data Return bitstream data
* x Spectral coefficients
* y Return shapped coefficients
*
* `x` and `y` can be the same buffer
*/
void lc3_sns_analyze(
enum lc3_dt dt, enum lc3_srate sr, int nbytes,
const float *eb, bool att, lc3_sns_data_t *data,
const float *x, float *y);
/**
* Return number of bits coding the bitstream data
* return Bit consumption
*/
int lc3_sns_get_nbits(void);
/**
* Put bitstream data
* bits Bitstream context
* data Bitstream data
*/
void lc3_sns_put_data(lc3_bits_t *bits, const lc3_sns_data_t *data);
/* ----------------------------------------------------------------------------
* Decoding
* -------------------------------------------------------------------------- */
/**
* Get bitstream data
* bits Bitstream context
* data Return SNS data
* return 0: Ok -1: Invalid SNS data
*/
int lc3_sns_get_data(lc3_bits_t *bits, lc3_sns_data_t *data);
/**
* SNS synthesis
* dt, sr Duration and samplerate of the frame
* data Bitstream data
* x Spectral coefficients
* y Return shapped coefficients
*
* `x` and `y` can be the same buffer
*/
void lc3_sns_synthesize(enum lc3_dt dt, enum lc3_srate sr,
const lc3_sns_data_t *data, const float *x, float *y);
#endif /* __LC3_SNS_H */
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