c->filter_bank[c->filter_length*PHASE_COUNT + (c->filter_length-1) + 1]= (1<<FILTER_SHIFT)-1; c->filter_bank[c->filter_length*PHASE_COUNT + (c->filter_length-1) + 2]= 1;
c->filter_bank[c->filter_length*PHASE_COUNT + (c->filter_length-1)/2 + 1]= (1<<FILTER_SHIFT)-1; c->filter_bank[c->filter_length*PHASE_COUNT + (c->filter_length-1)/2 + 2]= 1;
AVResampleContext *av_resample_init(int out_rate, int in_rate){    AVResampleContext *c= av_mallocz(sizeof(AVResampleContext));    double factor= FFMIN(out_rate / (double)in_rate, 1.0);    memset(c, 0, sizeof(AVResampleContext));    c->filter_length= ceil(16.0/factor);    c->filter_bank= av_mallocz(c->filter_length*(PHASE_COUNT+1)*sizeof(short));    av_build_filter(c->filter_bank, factor, c->filter_length, PHASE_COUNT, 1<<FILTER_SHIFT, 1);    c->filter_bank[c->filter_length*PHASE_COUNT + (c->filter_length-1) + 1]= (1<<FILTER_SHIFT)-1;    c->filter_bank[c->filter_length*PHASE_COUNT + (c->filter_length-1) + 2]= 1;    c->src_incr= out_rate;    c->ideal_dst_incr= c->dst_incr= in_rate * PHASE_COUNT;    c->index= -PHASE_COUNT*((c->filter_length-1)/2);    return c;}