19a19cd78SMatthias Ringwald /****************************************************************************** 29a19cd78SMatthias Ringwald * 3*4930cef6SMatthias Ringwald * Copyright 2022 Google LLC 49a19cd78SMatthias Ringwald * 59a19cd78SMatthias Ringwald * Licensed under the Apache License, Version 2.0 (the "License"); 69a19cd78SMatthias Ringwald * you may not use this file except in compliance with the License. 79a19cd78SMatthias Ringwald * You may obtain a copy of the License at: 89a19cd78SMatthias Ringwald * 99a19cd78SMatthias Ringwald * http://www.apache.org/licenses/LICENSE-2.0 109a19cd78SMatthias Ringwald * 119a19cd78SMatthias Ringwald * Unless required by applicable law or agreed to in writing, software 129a19cd78SMatthias Ringwald * distributed under the License is distributed on an "AS IS" BASIS, 139a19cd78SMatthias Ringwald * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 149a19cd78SMatthias Ringwald * See the License for the specific language governing permissions and 159a19cd78SMatthias Ringwald * limitations under the License. 169a19cd78SMatthias Ringwald * 179a19cd78SMatthias Ringwald ******************************************************************************/ 189a19cd78SMatthias Ringwald 199a19cd78SMatthias Ringwald /** 209a19cd78SMatthias Ringwald * LC3 - Bandwidth detector 219a19cd78SMatthias Ringwald * 229a19cd78SMatthias Ringwald * Reference : Low Complexity Communication Codec (LC3) 239a19cd78SMatthias Ringwald * Bluetooth Specification v1.0 249a19cd78SMatthias Ringwald */ 259a19cd78SMatthias Ringwald 269a19cd78SMatthias Ringwald #ifndef __LC3_BWDET_H 279a19cd78SMatthias Ringwald #define __LC3_BWDET_H 289a19cd78SMatthias Ringwald 299a19cd78SMatthias Ringwald #include "common.h" 309a19cd78SMatthias Ringwald #include "bits.h" 319a19cd78SMatthias Ringwald 329a19cd78SMatthias Ringwald 339a19cd78SMatthias Ringwald /** 349a19cd78SMatthias Ringwald * Bandwidth detector (cf. 3.3.5) 359a19cd78SMatthias Ringwald * dt, sr Duration and samplerate of the frame 369a19cd78SMatthias Ringwald * e Energy estimation per bands 379a19cd78SMatthias Ringwald * return Return detected bandwitdth 389a19cd78SMatthias Ringwald */ 399a19cd78SMatthias Ringwald enum lc3_bandwidth lc3_bwdet_run( 409a19cd78SMatthias Ringwald enum lc3_dt dt, enum lc3_srate sr, const float *e); 419a19cd78SMatthias Ringwald 429a19cd78SMatthias Ringwald /** 439a19cd78SMatthias Ringwald * Return number of bits coding the bandwidth value 449a19cd78SMatthias Ringwald * sr Samplerate of the frame 459a19cd78SMatthias Ringwald * return Number of bits coding the bandwidth value 469a19cd78SMatthias Ringwald */ 479a19cd78SMatthias Ringwald int lc3_bwdet_get_nbits(enum lc3_srate sr); 489a19cd78SMatthias Ringwald 499a19cd78SMatthias Ringwald /** 509a19cd78SMatthias Ringwald * Put bandwidth indication 519a19cd78SMatthias Ringwald * bits Bitstream context 529a19cd78SMatthias Ringwald * sr Samplerate of the frame 539a19cd78SMatthias Ringwald * bw Bandwidth detected 549a19cd78SMatthias Ringwald */ 559a19cd78SMatthias Ringwald void lc3_bwdet_put_bw(lc3_bits_t *bits, 569a19cd78SMatthias Ringwald enum lc3_srate sr, enum lc3_bandwidth bw); 579a19cd78SMatthias Ringwald 589a19cd78SMatthias Ringwald /** 599a19cd78SMatthias Ringwald * Get bandwidth indication 609a19cd78SMatthias Ringwald * bits Bitstream context 619a19cd78SMatthias Ringwald * sr Samplerate of the frame 629a19cd78SMatthias Ringwald * bw Return bandwidth indication 639a19cd78SMatthias Ringwald * return 0: Ok -1: Invalid bandwidth indication 649a19cd78SMatthias Ringwald */ 659a19cd78SMatthias Ringwald int lc3_bwdet_get_bw(lc3_bits_t *bits, 669a19cd78SMatthias Ringwald enum lc3_srate sr, enum lc3_bandwidth *bw); 679a19cd78SMatthias Ringwald 689a19cd78SMatthias Ringwald 699a19cd78SMatthias Ringwald #endif /* __LC3_BWDET_H */ 70