70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/******************************************************************************
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*
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* Copyright 2022 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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/**
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* LC3 - Bandwidth detector
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*
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* Reference : Low Complexity Communication Codec (LC3)
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* Bluetooth Specification v1.0
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*/
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#ifndef __LC3_BWDET_H
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#define __LC3_BWDET_H
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#include "common.h"
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#include "bits.h"
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/**
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* Bandwidth detector (cf. 3.3.5)
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* dt, sr Duration and samplerate of the frame
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* e Energy estimation per bands
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* return Return detected bandwitdth
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*/
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enum lc3_bandwidth lc3_bwdet_run(
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enum lc3_dt dt, enum lc3_srate sr, const float *e);
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/**
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* Return number of bits coding the bandwidth value
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* sr Samplerate of the frame
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* return Number of bits coding the bandwidth value
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*/
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int lc3_bwdet_get_nbits(enum lc3_srate sr);
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/**
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* Put bandwidth indication
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* bits Bitstream context
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* sr Samplerate of the frame
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* bw Bandwidth detected
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*/
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void lc3_bwdet_put_bw(lc3_bits_t *bits,
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enum lc3_srate sr, enum lc3_bandwidth bw);
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/**
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* Get bandwidth indication
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* bits Bitstream context
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* sr Samplerate of the frame
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* bw Return bandwidth indication
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* return 0: Ok -1: Invalid bandwidth indication
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*/
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int lc3_bwdet_get_bw(lc3_bits_t *bits,
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enum lc3_srate sr, enum lc3_bandwidth *bw);
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#endif /* __LC3_BWDET_H */
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