1 /* Copyright 2018 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 #ifndef TENSORFLOW_LITE_EXPERIMENTAL_MICROFRONTEND_LIB_FILTERBANK_UTIL_H_ 16 #define TENSORFLOW_LITE_EXPERIMENTAL_MICROFRONTEND_LIB_FILTERBANK_UTIL_H_ 17 18 #include "tensorflow/lite/experimental/microfrontend/lib/filterbank.h" 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 struct FilterbankConfig { 25 // number of frequency channel buckets for filterbank 26 int num_channels; 27 // maximum frequency to include 28 float upper_band_limit; 29 // minimum frequency to include 30 float lower_band_limit; 31 // unused 32 int output_scale_shift; 33 }; 34 35 // Fills the frontendConfig with "sane" defaults. 36 void FilterbankFillConfigWithDefaults(struct FilterbankConfig* config); 37 38 // Allocates any buffers. 39 int FilterbankPopulateState(const struct FilterbankConfig* config, 40 struct FilterbankState* state, int sample_rate, 41 int spectrum_size); 42 43 // Frees any allocated buffers. 44 void FilterbankFreeStateContents(struct FilterbankState* state); 45 46 #ifdef __cplusplus 47 } // extern "C" 48 #endif 49 50 #endif // TENSORFLOW_LITE_EXPERIMENTAL_MICROFRONTEND_LIB_FILTERBANK_UTIL_H_ 51
