| 45 | } |
| 46 | |
| 47 | void Mfcc::Compute(const std::vector<double>& spectrogram_frame, |
| 48 | std::vector<double>* output) const { |
| 49 | if (!initialized_) { |
| 50 | LOG(ERROR) << "Mfcc not initialized."; |
| 51 | return; |
| 52 | } |
| 53 | std::vector<double> working; |
| 54 | mel_filterbank_.Compute(spectrogram_frame, &working); |
| 55 | for (int i = 0; i < working.size(); ++i) { |
| 56 | double val = working[i]; |
| 57 | if (val < kFilterbankFloor) { |
| 58 | val = kFilterbankFloor; |
| 59 | } |
| 60 | working[i] = log(val); |
| 61 | } |
| 62 | dct_.Compute(working, output); |
| 63 | } |
| 64 | |
| 65 | } // namespace tensorflow |