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/** * Calculate the pitch vector by interpolating the past excitation at the pitch * pitch lag using a b60 hamming windowed sinc function * * @param p                   pointer to the AMRContext * @param lag_int             integer part of pitch lag * @param lag_frac            fractional part of pitch lag * * @return void */static void interp_pitch_vector(AMRContext *p, int lag_int, int lag_frac) {    int n, i;    float *b60_idx1, *b60_idx2, *exc_idx;    lag_frac *= -1;    if(p->cur_frame_mode != MODE_122) {        lag_frac <<= 1;    }    if(lag_frac < 0) {        lag_frac += 6;        lag_int--;    }    b60_idx1 = &b60[    lag_frac];    b60_idx2 = &b60[6 - lag_frac];    exc_idx = &p->prev_excitation[-lag_int];    for(n=0; n<AMR_SUBFRAME_SIZE; n++) {        for(i=0; i<10; i++) {            p->pitch_vector[n] += b60_idx1[6*i] * exc_idx[-i];        }        exc_idx++;        for(i=0; i<10; i++) {            p->pitch_vector[n] += b60_idx2[6*i] * exc_idx[ i];        }        exc_idx++;    }}