void (*sum_square_butterfly_float)(float sum[4], const float *coef0,
const float *coef1, int len);
+
+ void (*downmix)(float (*samples)[256], float (*matrix)[2], int out_ch,
+ int in_ch, int len);
} AC3DSPContext;
void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact);