Function mel_spectrogram

tools/audio/source/audio.cpp:457–462

}

VARP mel_spectrogram(VARP waveform, const MelscaleParams *mel_params, const SpectrogramParams *spec_params) {
    auto banks        = melscale_fbanks(mel_params);
    auto specgram     = spectrogram(waveform, spec_params);
    auto mel_specgram = _MatMul(specgram, banks, false, true);
    return mel_specgram;
}

VARP fbank(VARP waveform, int sampling_rate, int n_mels, int n_fft, int hop_length, float dither, float preemphasis) {
    int wav_len      = waveform->getInfo()->size;