73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#include "tensorflow/lite/experimental/microfrontend/lib/fft_util.h"
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#include <stdio.h>
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#define FIXED_POINT 16
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#include "kiss_fft.h"
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#include "tools/kiss_fftr.h"
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int FftPopulateState(struct FftState* state, size_t input_size) {
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state->input_size = input_size;
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state->fft_size = 1;
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while (state->fft_size < state->input_size) {
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state->fft_size <<= 1;
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}
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state->input = reinterpret_cast<int16_t*>(
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malloc(state->fft_size * sizeof(*state->input)));
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if (state->input == nullptr) {
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fprintf(stderr, "Failed to alloc fft input buffer\n");
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return 0;
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}
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state->output = reinterpret_cast<complex_int16_t*>(
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malloc((state->fft_size / 2 + 1) * sizeof(*state->output) * 2));
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if (state->output == nullptr) {
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fprintf(stderr, "Failed to alloc fft output buffer\n");
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return 0;
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}
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// Ask kissfft how much memory it wants.
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size_t scratch_size = 0;
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kiss_fftr_cfg kfft_cfg = kiss_fftr_alloc(
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state->fft_size, 0, nullptr, &scratch_size);
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if (kfft_cfg != nullptr) {
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fprintf(stderr, "Kiss memory sizing failed.\n");
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return 0;
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}
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state->scratch = malloc(scratch_size);
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if (state->scratch == nullptr) {
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fprintf(stderr, "Failed to alloc fft scratch buffer\n");
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return 0;
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}
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state->scratch_size = scratch_size;
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// Let kissfft configure the scratch space we just allocated
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kfft_cfg = kiss_fftr_alloc(state->fft_size, 0,
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state->scratch, &scratch_size);
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if (kfft_cfg != state->scratch) {
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fprintf(stderr, "Kiss memory preallocation strategy failed.\n");
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return 0;
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}
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return 1;
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}
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void FftFreeStateContents(struct FftState* state) {
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free(state->input);
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free(state->output);
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free(state->scratch);
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}
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