pcm 重采样

int resample( short *in_buf, short *out_buf, int n, int f_need, int f_out, int *last_t )
{
    int     t0 = *last_t, t1 = 0, t = t0, i = 0, j = 0;
    
    while( j <= n )
    {
        while( t1 < t )
        {
            j++;
            t1 += f_out;
        }
        if( j > 1024 )
        {
            *last_t = f_out - (t1 - t);
            NSLog(@"%d",*last_t);
            in_buf[0] = in_buf[1024];
            return i;
        }
        else
        {
//            if (i!=j)
            {
            NSLog(@"i %d  j%d  %d",i,j,t1-t);
            }
            NSLog(@"%d",in_buf[-1]);
            out_buf[i] = in_buf[j] - (t1 - t)*(in_buf[j] - in_buf[j-1])/f_out;
            i++;
            t += f_need;
        }
    }