public static extern void av_mdct_end(FFTContext *s);
public static extern void av_mdct_calc(FFTContext *s, float *output, float *input);
public static extern void av_fft_calc(FFTContext *s, FFTComplex *z);
public static extern void av_imdct_half(FFTContext *s, float *output, float *input);
public static extern void av_fft_permute(FFTContext *s, FFTComplex *z);