]> git.donarmstrong.com Git - samtools.git/blobdiff - bam2bcf.c
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[samtools.git] / bam2bcf.c
index ab5bfcd20d4a6233109821846842d9996aab93a9..a51a406f249c05834b0d8e20f49403d5ed29a3b6 100644 (file)
--- a/bam2bcf.c
+++ b/bam2bcf.c
@@ -3,6 +3,7 @@
 #include "bam.h"
 #include "kstring.h"
 #include "bam2bcf.h"
+#include "errmod.h"
 #include "bcftools/bcf.h"
 
 extern void ks_introsort_uint32_t(size_t n, uint32_t a[]);
@@ -10,6 +11,7 @@ extern        void ks_introsort_uint32_t(size_t n, uint32_t a[]);
 #define CALL_ETA 0.03f
 #define CALL_MAX 256
 #define CALL_DEFTHETA 0.83f
+#define DEF_MAPQ 20
 
 #define CAP_DIST 25
 
@@ -19,11 +21,12 @@ bcf_callaux_t *bcf_call_init(double theta, int min_baseQ)
        if (theta <= 0.) theta = CALL_DEFTHETA;
        bca = calloc(1, sizeof(bcf_callaux_t));
        bca->capQ = 60;
-       bca->openQ = 40;
-       bca->extQ = 20;
-       bca->tandemQ = 100;
+       bca->openQ = 40; bca->extQ = 20; bca->tandemQ = 100;
        bca->min_baseQ = min_baseQ;
        bca->e = errmod_init(1. - theta);
+       bca->min_frac = 0.002;
+       bca->min_support = 1;
+    bca->per_sample_flt = 0;
        return bca;
 }
 
@@ -31,16 +34,20 @@ void bcf_call_destroy(bcf_callaux_t *bca)
 {
        if (bca == 0) return;
        errmod_destroy(bca->e);
-       free(bca->bases); free(bca);
+       free(bca->bases); free(bca->inscns); free(bca);
 }
-
-int bcf_call_glfgen(int _n, const bam_pileup1_t *pl, int ref_base /*4-bit*/, bcf_callaux_t *bca, bcf_callret1_t *r)
+/* ref_base is the 4-bit representation of the reference base. It is
+ * negative if we are looking at an indel. */
+int bcf_call_glfgen(int _n, const bam_pileup1_t *pl, int ref_base, bcf_callaux_t *bca, bcf_callret1_t *r)
 {
-       int i, n, ref4;
+    static int *var_pos = NULL, nvar_pos = 0;
+       int i, n, ref4, is_indel, ori_depth = 0;
        memset(r, 0, sizeof(bcf_callret1_t));
-       ref4 = bam_nt16_nt4_table[ref_base];
+       if (ref_base >= 0) {
+               ref4 = bam_nt16_nt4_table[ref_base];
+               is_indel = 0;
+       } else ref4 = 4, is_indel = 1;
        if (_n == 0) return -1;
-
        // enlarge the bases array if necessary
        if (bca->max_bases < _n) {
                bca->max_bases = _n;
@@ -48,166 +55,148 @@ int bcf_call_glfgen(int _n, const bam_pileup1_t *pl, int ref_base /*4-bit*/, bcf
                bca->bases = (uint16_t*)realloc(bca->bases, 2 * bca->max_bases);
        }
        // fill the bases array
-       memset(r, 0, sizeof(bcf_callret1_t));
-       for (i = n = 0; i < _n; ++i) {
+       for (i = n = r->n_supp = 0; i < _n; ++i) {
                const bam_pileup1_t *p = pl + i;
-               int q, b, mapQ, baseQ, is_diff, min_dist;
+               int q, b, mapQ, baseQ, is_diff, min_dist, seqQ;
                // set base
                if (p->is_del || p->is_refskip || (p->b->core.flag&BAM_FUNMAP)) continue;
-               baseQ = q = (int)bam1_qual(p->b)[p->qpos]; // base quality
+               ++ori_depth;
+               baseQ = q = is_indel? p->aux&0xff : (int)bam1_qual(p->b)[p->qpos]; // base/indel quality
+               seqQ = is_indel? (p->aux>>8&0xff) : 99;
                if (q < bca->min_baseQ) continue;
-               mapQ = p->b->core.qual < bca->capQ? p->b->core.qual : bca->capQ;
+               if (q > seqQ) q = seqQ;
+               mapQ = p->b->core.qual < 255? p->b->core.qual : DEF_MAPQ; // special case for mapQ==255
+               mapQ = mapQ < bca->capQ? mapQ : bca->capQ;
                if (q > mapQ) q = mapQ;
                if (q > 63) q = 63;
                if (q < 4) q = 4;
-               b = bam1_seqi(bam1_seq(p->b), p->qpos); // base
-               b = bam_nt16_nt4_table[b? b : ref_base]; // b is the 2-bit base
+               if (!is_indel) {
+                       b = bam1_seqi(bam1_seq(p->b), p->qpos); // base
+                       b = bam_nt16_nt4_table[b? b : ref_base]; // b is the 2-bit base
+                       is_diff = (ref4 < 4 && b == ref4)? 0 : 1;
+               } else {
+                       b = p->aux>>16&0x3f;
+                       is_diff = (b != 0);
+               }
+               if (is_diff) ++r->n_supp;
                bca->bases[n++] = q<<5 | (int)bam1_strand(p->b)<<4 | b;
                // collect annotations
-               r->qsum[b] += q;
-               is_diff = (ref4 < 4 && b == ref4)? 0 : 1;
+               if (b < 4) r->qsum[b] += q;
                ++r->anno[0<<2|is_diff<<1|bam1_strand(p->b)];
                min_dist = p->b->core.l_qseq - 1 - p->qpos;
                if (min_dist > p->qpos) min_dist = p->qpos;
                if (min_dist > CAP_DIST) min_dist = CAP_DIST;
                r->anno[1<<2|is_diff<<1|0] += baseQ;
-               r->anno[1<<2|is_diff<<1|1] += baseQ * baseQ;
+               r->anno[1<<2|is_diff<<1|1] += baseQ * baseQ;    // FIXME: signed int is not enough for thousands of samples
                r->anno[2<<2|is_diff<<1|0] += mapQ;
-               r->anno[2<<2|is_diff<<1|1] += mapQ * mapQ;
+               r->anno[2<<2|is_diff<<1|1] += mapQ * mapQ;              // FIXME: signed int is not enough for thousands of samples
                r->anno[3<<2|is_diff<<1|0] += min_dist;
                r->anno[3<<2|is_diff<<1|1] += min_dist * min_dist;
        }
-       r->depth = n;
+       r->depth = n; r->ori_depth = ori_depth;
        // glfgen
        errmod_cal(bca->e, n, 5, bca->bases, r->p);
+
+    // Calculate the Variant Distance Bias (make it optional?)
+    if ( nvar_pos < _n ) {
+        nvar_pos = _n;
+        var_pos = realloc(var_pos,sizeof(int)*nvar_pos);
+    }
+    int alt_dp=0, read_len=0;
+    for (i=0; i<_n; i++) {
+        const bam_pileup1_t *p = pl + i;
+        if ( bam1_seqi(bam1_seq(p->b),p->qpos) == ref_base ) 
+            continue;
+
+        var_pos[alt_dp] = p->qpos;
+        if ( (bam1_cigar(p->b)[0]&BAM_CIGAR_MASK)==4 )
+            var_pos[alt_dp] -= bam1_cigar(p->b)[0]>>BAM_CIGAR_SHIFT;
+
+        alt_dp++;
+        read_len += p->b->core.l_qseq;
+    }
+    float mvd=0;
+    int j;
+    n=0;
+    for (i=0; i<alt_dp; i++) {
+        for (j=0; j<i; j++) {
+            mvd += abs(var_pos[i] - var_pos[j]);
+            n++;
+        }
+    }
+    r->mvd[0] = n ? mvd/n : 0;
+    r->mvd[1] = alt_dp;
+    r->mvd[2] = alt_dp ? read_len/alt_dp : 0;
+
        return r->depth;
 }
 
-int bcf_call_glfgen_gap(int pos, int _n, const bam_pileup1_t *pl, bcf_callaux_t *bca, bcf_callret1_t *r)
+
+void calc_vdb(int n, const bcf_callret1_t *calls, bcf_call_t *call)
 {
-       int i, n, n_ins, n_del;
-       memset(r, 0, sizeof(bcf_callret1_t));
-       if (_n == 0) return -1;
+    // Variant distance bias. Samples merged by means of DP-weighted average.
 
-       // enlarge the bases array if necessary
-       if (bca->max_bases < _n) {
-               bca->max_bases = _n;
-               kroundup32(bca->max_bases);
-               bca->bases = (uint16_t*)realloc(bca->bases, 2 * bca->max_bases);
-       }
-       // fill the bases array
-       memset(r, 0, sizeof(bcf_callret1_t));
-       r->indelreg = 10000;
-       n_ins = n_del = 0;
-       for (i = n = 0; i < _n; ++i) {
-               const bam_pileup1_t *p = pl + i;
-               int q, b, mapQ, indelQ, is_diff, min_dist;
-               if (p->is_del || p->is_refskip || (p->b->core.flag&BAM_FUNMAP)) continue;
-               { // compute indel (base) quality
-                       // this can be made more efficient, but realignment is the bottleneck anyway
-                       int j, k, x, y, op, len = 0, max_left, max_rght, seqQ, indelreg;
-                       bam1_core_t *c = &p->b->core;
-                       uint32_t *cigar = bam1_cigar(p->b);
-                       uint8_t *qual = bam1_qual(p->b);
-                       for (k = y = 0, x = c->pos; k < c->n_cigar && y <= p->qpos; ++k) {
-                               op = cigar[k]&0xf;
-                               len = cigar[k]>>4;
-                               if (op == BAM_CMATCH) {
-                                       if (pos > x && pos < x + len) break;
-                                       x += len; y += len;
-                               } else if (op == BAM_CINS || op == BAM_CSOFT_CLIP) y += len;
-                               else if (op == BAM_CDEL || op == BAM_CREF_SKIP) x += len;
-                       }
-                       if (k == c->n_cigar) continue; // this actually should not happen
-                       max_left = max_rght = 0; indelreg = 0;
-                       if (pos == x + len - 1 && k+2 < c->n_cigar && ((cigar[k+1]&0xf) == BAM_CINS || (cigar[k+1]&0xf) == BAM_CDEL)
-                               && (cigar[k+2]&0xf) == BAM_CMATCH)
-                       {
-                               for (j = y; j < y + len; ++j)
-                                       if (max_left < qual[j]) max_left = qual[j];
-                               if ((cigar[k+1]&0xf) == BAM_CINS) y += cigar[k+1]>>4;
-                               else x += cigar[k+1]>>4;
-                               op = cigar[k+2]&0xf; len = cigar[k+2]>>4;
-                               for (j = y; j < y + len; ++j) {
-                                       if (max_rght < qual[j]) max_rght = qual[j];
-                                       if (qual[j] > BAM2BCF_INDELREG_THRES && indelreg == 0)
-                                               indelreg = j - y + 1;
-                               }
-                               if (r->indelreg > indelreg) r->indelreg = indelreg;
-                       } else {
-                               for (j = y; j <= p->qpos; ++j)
-                                       if (max_left < qual[j]) max_left = qual[j];
-                               for (j = p->qpos + 1; j < y + len; ++j)
-                                       if (max_rght < qual[j]) max_rght = qual[j];
-                                       
-                       }
-                       indelQ = max_left < max_rght? max_left : max_rght;
-                       // estimate the sequencing error rate
-                       seqQ = bca->openQ;
-                       if (p->indel != 0) seqQ += bca->extQ * (abs(p->indel) - 1); // FIXME: better to model homopolymer
-                       if (p->indel > 0) {
-                               ++n_ins; r->ins_len += p->indel;
-                       } else if (p->indel < 0) {
-                               ++n_del; r->del_len += -p->indel;
-                       }
-                       if (p->indel != 0) { // a different model for tandem repeats
-                               uint8_t *seq = bam1_seq(p->b);
-                               int tandemQ, qb = bam1_seqi(seq, p->qpos), l;
-                               for (j = p->qpos + 1; j < c->l_qseq; ++j)
-                                       if (qb != bam1_seqi(seq, j)) break;
-                               l = j;
-                               for (j = (int)p->qpos - 1; j >= 0; --j)
-                                       if (qb != bam1_seqi(seq, j)) break;
-                               l = l - (j + 1);
-                               tandemQ = (int)((double)(abs(p->indel)) / l * bca->tandemQ + .499);
-                               if (seqQ > tandemQ) seqQ = tandemQ;
-                       }
-//                     fprintf(stderr, "%s\t%d\t%d\t%d\t%d\t%d\t%d\n", bam1_qname(p->b), pos+1, p->indel, indelQ, seqQ, max_left, max_rght);
-                       if (indelQ > seqQ) indelQ = seqQ;
-                       q = indelQ;
-               }
-               if (q < bca->min_baseQ) continue;
-               mapQ = p->b->core.qual < bca->capQ? p->b->core.qual : bca->capQ;
-               if (q > mapQ) q = mapQ;
-               if (q > 63) q = 63;
-               if (q < 4) q = 4;
-               b = p->indel? 1 : 0;
-               bca->bases[n++] = q<<5 | (int)bam1_strand(p->b)<<4 | b;
-               // collect annotations
-               r->qsum[b] += q;
-               is_diff = b;
-               ++r->anno[0<<2|is_diff<<1|bam1_strand(p->b)];
-               min_dist = p->b->core.l_qseq - 1 - p->qpos;
-               if (min_dist > p->qpos) min_dist = p->qpos;
-               if (min_dist > CAP_DIST) min_dist = CAP_DIST;
-               r->anno[1<<2|is_diff<<1|0] += indelQ;
-               r->anno[1<<2|is_diff<<1|1] += indelQ * indelQ;
-               r->anno[2<<2|is_diff<<1|0] += mapQ;
-               r->anno[2<<2|is_diff<<1|1] += mapQ * mapQ;
-               r->anno[3<<2|is_diff<<1|0] += min_dist;
-               r->anno[3<<2|is_diff<<1|1] += min_dist * min_dist;
-       }
-       r->depth = n;
-       r->ins_len = n_ins? r->ins_len / n_ins : 0;
-       r->del_len = n_del? r->del_len / n_del : 0;
-       if (r->indelreg >= 10000) r->indelreg = 0;
-       // glfgen
-       errmod_cal(bca->e, n, 2, bca->bases, r->p);
-       return r->depth;        
+    float weight=0, tot_prob=0;
+
+    int i;
+    for (i=0; i<n; i++)
+    {
+        int mvd      = calls[i].mvd[0];
+        int dp       = calls[i].mvd[1];
+        int read_len = calls[i].mvd[2];
+
+        if ( dp<2 ) continue;
+
+        float prob = 0;
+        if ( dp==2 )
+        {
+            // Exact formula
+            prob = (mvd==0) ? 1.0/read_len : (read_len-mvd)*2.0/read_len/read_len;
+        }
+        else if ( dp==3 )
+        {
+            // Sin, quite accurate approximation
+            float mu = read_len/2.9;
+            prob = mvd>2*mu ? 0 : sin(mvd*3.14/2/mu) / (4*mu/3.14);
+        }
+        else
+        {
+            // Scaled gaussian curve, crude approximation, but behaves well. Using fixed depth for bigger depths.
+            if ( dp>5 )
+                dp = 5;
+            float sigma2 = (read_len/1.9/(dp+1)) * (read_len/1.9/(dp+1));
+            float norm   = 1.125*sqrt(2*3.14*sigma2);
+            float mu     = read_len/2.9;
+            if ( mvd < mu )
+                prob = exp(-(mvd-mu)*(mvd-mu)/2/sigma2)/norm;
+            else
+                prob = exp(-(mvd-mu)*(mvd-mu)/3.125/sigma2)/norm;
+        }
+
+        //fprintf(stderr,"dp=%d mvd=%d read_len=%d -> prob=%f\n", dp,mvd,read_len,prob);
+        tot_prob += prob*dp;
+        weight += dp;
+    }
+    tot_prob = weight ? tot_prob/weight : 1; 
+    //fprintf(stderr,"prob=%f\n", tot_prob);
+    call->vdb = tot_prob;
 }
 
 int bcf_call_combine(int n, const bcf_callret1_t *calls, int ref_base /*4-bit*/, bcf_call_t *call)
 {
        int ref4, i, j, qsum[4];
        int64_t tmp;
-       call->ori_ref = ref4 = bam_nt16_nt4_table[ref_base];
-       call->ins_len = call->del_len = 0; call->indelreg = 0;
-       if (ref4 > 4) ref4 = 4;
+       if (ref_base >= 0) {
+               call->ori_ref = ref4 = bam_nt16_nt4_table[ref_base];
+               if (ref4 > 4) ref4 = 4;
+       } else call->ori_ref = -1, ref4 = 0;
        // calculate qsum
        memset(qsum, 0, 4 * sizeof(int));
        for (i = 0; i < n; ++i)
                for (j = 0; j < 4; ++j)
                        qsum[j] += calls[i].qsum[j];
+    int qsum_tot=0;
+    for (j=0; j<4; j++) { qsum_tot += qsum[j]; call->qsum[j] = 0; }
        for (j = 0; j < 4; ++j) qsum[j] = qsum[j] << 2 | j;
        // find the top 2 alleles
        for (i = 1; i < 4; ++i) // insertion sort
@@ -219,13 +208,24 @@ int bcf_call_combine(int n, const bcf_callret1_t *calls, int ref_base /*4-bit*/,
        call->a[0] = ref4;
        for (i = 3, j = 1; i >= 0; --i) {
                if ((qsum[i]&3) != ref4) {
-                       if (qsum[i]>>2 != 0) call->a[j++] = qsum[i]&3;
+                       if (qsum[i]>>2 != 0) 
+            {
+                if ( j<4 ) call->qsum[j] = (float)(qsum[i]>>2)/qsum_tot; // ref N can make j>=4
+                call->a[j++]  = qsum[i]&3;
+            }
                        else break;
                }
+        else 
+            call->qsum[0] = (float)(qsum[i]>>2)/qsum_tot;
+       }
+       if (ref_base >= 0) { // for SNPs, find the "unseen" base
+               if (((ref4 < 4 && j < 4) || (ref4 == 4 && j < 5)) && i >= 0)
+                       call->unseen = j, call->a[j++] = qsum[i]&3;
+               call->n_alleles = j;
+       } else {
+               call->n_alleles = j;
+               if (call->n_alleles == 1) return -1; // no reliable supporting read. stop doing anything
        }
-       if (((ref4 < 4 && j < 4) || (ref4 == 4 && j < 5)) && i >= 0)
-               call->unseen = j, call->a[j++] = qsum[i]&3;
-       call->n_alleles = j;
        // set the PL array
        if (call->n < n) {
                call->n = n;
@@ -237,8 +237,8 @@ int bcf_call_combine(int n, const bcf_callret1_t *calls, int ref_base /*4-bit*/,
                x = call->n_alleles * (call->n_alleles + 1) / 2;
                // get the possible genotypes
                for (i = z = 0; i < call->n_alleles; ++i)
-                       for (j = i; j < call->n_alleles; ++j)
-                               g[z++] = call->a[i] * 5 + call->a[j];
+                       for (j = 0; j <= i; ++j)
+                               g[z++] = call->a[j] * 5 + call->a[i];
                for (i = 0; i < n; ++i) {
                        uint8_t *PL = call->PL + x * i;
                        const bcf_callret1_t *r = calls + i;
@@ -253,126 +253,96 @@ int bcf_call_combine(int n, const bcf_callret1_t *calls, int ref_base /*4-bit*/,
                                PL[j] = y;
                        }
                }
+//             if (ref_base < 0) fprintf(stderr, "%d,%d,%f,%d\n", call->n_alleles, x, sum_min, call->unseen);
                call->shift = (int)(sum_min + .499);
        }
        // combine annotations
        memset(call->anno, 0, 16 * sizeof(int));
-       for (i = call->depth = 0, tmp = 0; i < n; ++i) {
+       for (i = call->depth = call->ori_depth = 0, tmp = 0; i < n; ++i) {
                call->depth += calls[i].depth;
+               call->ori_depth += calls[i].ori_depth;
                for (j = 0; j < 16; ++j) call->anno[j] += calls[i].anno[j];
        }
-       return 0;
-}
 
-int bcf_call_combine_gap(int n, const bcf_callret1_t *calls, bcf_call_t *call)
-{
-       int i, j, n_ins, n_del;
-       // combine annotations
-       call->ori_ref = 4;
-       memset(call->anno, 0, 16 * sizeof(int));
-       call->ins_len = call->del_len = 0; call->indelreg = 10000;
-       for (i = call->depth = 0, n_ins = n_del = 0; i < n; ++i) {
-               const bcf_callret1_t *r = calls + i;
-               if (r->depth > 0) {
-                       call->depth += r->depth;
-                       if (r->ins_len > 0) {
-                               call->ins_len += r->ins_len;
-                               ++n_ins;
-                       }
-                       if (r->del_len > 0) {
-                               call->del_len += r->del_len;
-                               ++n_del;
-                       }
-                       if (r->indelreg > 0 && call->indelreg > r->indelreg)
-                               call->indelreg = r->indelreg;
-                       for (j = 0; j < 16; ++j) call->anno[j] += r->anno[j];
-               }
-       }
-       if (call->depth == 0) return 0; // no indels
-       call->ins_len = n_ins? call->ins_len / n_ins : 0;
-       call->del_len = n_del? call->del_len / n_del : 0;
-       //
-       for (i = 0; i < 5; ++i) call->a[i] = -1;
-       call->a[0] = 0; call->a[1] = 1;
-       call->unseen = -1;
-       call->n_alleles = 2;
-       // set the PL array
-       if (call->n < n) {
-               call->n = n;
-               call->PL = realloc(call->PL, 15 * n);
-       }
-       {
-               int g[3];
-               double sum_min = 0.;
-               g[0] = 0; g[1] = 1; g[2] = 3;
-               for (i = 0; i < n; ++i) {
-                       uint8_t *PL = call->PL + 3 * i;
-                       const bcf_callret1_t *r = calls + i;
-                       float min = 1e37;
-                       for (j = 0; j < 3; ++j)
-                               if (min > r->p[g[j]]) min = r->p[g[j]];
-                       sum_min += min;
-                       for (j = 0; j < 3; ++j) {
-                               int y;
-                               y = (int)(r->p[g[j]] - min + .499);
-                               if (y > 255) y = 255;
-                               PL[j] = y;
-                       }
-               }
-               call->shift = (int)(sum_min + .499);
-       }
+    calc_vdb(n, calls, call);
+
        return 0;
 }
 
-int bcf_call2bcf(int tid, int pos, bcf_call_t *bc, bcf1_t *b, bcf_callret1_t *bcr, int is_SP)
+int bcf_call2bcf(int tid, int pos, bcf_call_t *bc, bcf1_t *b, bcf_callret1_t *bcr, int fmt_flag,
+                                const bcf_callaux_t *bca, const char *ref)
 {
        extern double kt_fisher_exact(int n11, int n12, int n21, int n22, double *_left, double *_right, double *two);
        kstring_t s;
-       int i;
+       int i, j;
        b->n_smpl = bc->n;
        b->tid = tid; b->pos = pos; b->qual = 0;
        s.s = b->str; s.m = b->m_str; s.l = 0;
        kputc('\0', &s);
-       if (bc->ins_len > 0 || bc->del_len > 0) { // an indel
-               for (i = 0; i < bc->indelreg; ++i) kputc('N', &s);
+       if (bc->ori_ref < 0) { // an indel
+               // write REF
+               kputc(ref[pos], &s);
+               for (j = 0; j < bca->indelreg; ++j) kputc(ref[pos+1+j], &s);
+               kputc('\0', &s);
+               // write ALT
+               kputc(ref[pos], &s);
+               for (i = 1; i < 4; ++i) {
+                       if (bc->a[i] < 0) break;
+                       if (i > 1) {
+                               kputc(',', &s); kputc(ref[pos], &s);
+                       }
+                       if (bca->indel_types[bc->a[i]] < 0) { // deletion
+                               for (j = -bca->indel_types[bc->a[i]]; j < bca->indelreg; ++j)
+                                       kputc(ref[pos+1+j], &s);
+                       } else { // insertion; cannot be a reference unless a bug
+                               char *inscns = &bca->inscns[bc->a[i] * bca->maxins];
+                               for (j = 0; j < bca->indel_types[bc->a[i]]; ++j)
+                                       kputc("ACGTN"[(int)inscns[j]], &s);
+                               for (j = 0; j < bca->indelreg; ++j) kputc(ref[pos+1+j], &s);
+                       }
+               }
                kputc('\0', &s);
-               if (bc->ins_len > 0 && bc->del_len > 0) kputs("<INDEL>", &s);
-               else if (bc->ins_len > 0) kputs("<INS>", &s);
-               else if (bc->del_len > 0) kputs("<DEL>", &s);
-       } else { // SNP
+       } else { // a SNP
                kputc("ACGTN"[bc->ori_ref], &s); kputc('\0', &s);
                for (i = 1; i < 5; ++i) {
                        if (bc->a[i] < 0) break;
                        if (i > 1) kputc(',', &s);
                        kputc(bc->unseen == i? 'X' : "ACGT"[bc->a[i]], &s);
                }
+               kputc('\0', &s);
        }
        kputc('\0', &s);
-       kputc('\0', &s);
        // INFO
-       kputs("I16=", &s);
+       if (bc->ori_ref < 0) ksprintf(&s,"INDEL;IS=%d,%f;", bca->max_support, bca->max_frac);
+       kputs("DP=", &s); kputw(bc->ori_depth, &s); kputs(";I16=", &s);
        for (i = 0; i < 16; ++i) {
                if (i) kputc(',', &s);
                kputw(bc->anno[i], &s);
        }
+    ksprintf(&s,";QS=%f,%f,%f,%f", bc->qsum[0],bc->qsum[1],bc->qsum[2],bc->qsum[3]);
+    if (bc->vdb != 1)
+        ksprintf(&s, ";VDB=%.4f", bc->vdb);
        kputc('\0', &s);
        // FMT
        kputs("PL", &s);
-       if (bcr) {
-               kputs(":DP", &s);
-               if (is_SP) kputs(":SP", &s);
+       if (bcr && fmt_flag) {
+               if (fmt_flag & B2B_FMT_DP) kputs(":DP", &s);
+               if (fmt_flag & B2B_FMT_DV) kputs(":DV", &s);
+               if (fmt_flag & B2B_FMT_SP) kputs(":SP", &s);
        }
        kputc('\0', &s);
        b->m_str = s.m; b->str = s.s; b->l_str = s.l;
        bcf_sync(b);
        memcpy(b->gi[0].data, bc->PL, b->gi[0].len * bc->n);
-       if (bcr) {
-               uint16_t *dp = (uint16_t*)b->gi[1].data;
-               uint8_t *sp = is_SP? b->gi[2].data : 0;
+       if (bcr && fmt_flag) {
+               uint16_t *dp = (fmt_flag & B2B_FMT_DP)? b->gi[1].data : 0;
+               uint16_t *dv = (fmt_flag & B2B_FMT_DV)? b->gi[1 + ((fmt_flag & B2B_FMT_DP) != 0)].data : 0;
+               int32_t  *sp = (fmt_flag & B2B_FMT_SP)? b->gi[1 + ((fmt_flag & B2B_FMT_DP) != 0) + ((fmt_flag & B2B_FMT_DV) != 0)].data : 0;
                for (i = 0; i < bc->n; ++i) {
                        bcf_callret1_t *p = bcr + i;
-                       dp[i] = p->depth < 0xffff? p->depth : 0xffff;
-                       if (is_SP) {
+                       if (dp) dp[i] = p->depth  < 0xffff? p->depth  : 0xffff;
+                       if (dv) dv[i] = p->n_supp < 0xffff? p->n_supp : 0xffff;
+                       if (sp) {
                                if (p->anno[0] + p->anno[1] < 2 || p->anno[2] + p->anno[3] < 2
                                        || p->anno[0] + p->anno[2] < 2 || p->anno[1] + p->anno[3] < 2)
                                {