]> git.donarmstrong.com Git - samtools.git/blobdiff - bam2bcf_indel.c
Merge branch 'vsbuffalo-master' into develop
[samtools.git] / bam2bcf_indel.c
index 8b80e3fc55d79751f0866814d87ce52cba39b858..9aea5f9d669f79850fb45438fdcf1183c3e1227f 100644 (file)
@@ -3,15 +3,16 @@
 #include <string.h>
 #include "bam.h"
 #include "bam2bcf.h"
-#include "ksort.h"
 #include "kaln.h"
 #include "kprobaln.h"
 #include "khash.h"
 KHASH_SET_INIT_STR(rg)
 
+#include "ksort.h"
+KSORT_INIT_GENERIC(uint32_t)
+
 #define MINUS_CONST 0x10000000
 #define INDEL_WINDOW_SIZE 50
-#define MIN_SUPPORT_COEF 500
 
 void *bcf_call_add_rg(void *_hash, const char *hdtext, const char *list)
 {
@@ -65,7 +66,7 @@ static int tpos2qpos(const bam1_core_t *c, const uint32_t *cigar, int32_t tpos,
        for (k = 0; k < c->n_cigar; ++k) {
                int op = cigar[k] & BAM_CIGAR_MASK;
                int l = cigar[k] >> BAM_CIGAR_SHIFT;
-               if (op == BAM_CMATCH) {
+               if (op == BAM_CMATCH || op == BAM_CEQUAL || op == BAM_CDIFF) {
                        if (c->pos > tpos) return y;
                        if (x + l > tpos) {
                                *_tpos = tpos;
@@ -111,10 +112,9 @@ static inline int est_indelreg(int pos, const char *ref, int l, char *ins4)
 int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_callaux_t *bca, const char *ref,
                                          const void *rghash)
 {
-       extern void ks_introsort_uint32_t(int, uint32_t*);
-       int i, s, j, k, t, n_types, *types, max_rd_len, left, right, max_ins, *score1, *score2;
+       int i, s, j, k, t, n_types, *types, max_rd_len, left, right, max_ins, *score1, *score2, max_ref2;
        int N, K, l_run, ref_type, n_alt;
-       char *inscns = 0, *ref2, *query;
+       char *inscns = 0, *ref2, *query, **ref_sample;
        khash_t(rg) *hash = (khash_t(rg)*)rghash;
        if (ref == 0 || bca == 0) return -1;
        // mark filtered reads
@@ -142,31 +142,53 @@ int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_calla
        if (s == n) return -1; // there is no indel at this position.
        for (s = N = 0; s < n; ++s) N += n_plp[s]; // N is the total number of reads
        { // find out how many types of indels are present
-               int m, n_alt = 0, n_tot = 0;
+        bca->max_support = bca->max_frac = 0;
+               int m, n_alt = 0, n_tot = 0, indel_support_ok = 0;
                uint32_t *aux;
                aux = calloc(N + 1, 4);
                m = max_rd_len = 0;
                aux[m++] = MINUS_CONST; // zero indel is always a type
                for (s = 0; s < n; ++s) {
+            int na = 0, nt = 0; 
                        for (i = 0; i < n_plp[s]; ++i) {
                                const bam_pileup1_t *p = plp[s] + i;
                                if (rghash == 0 || p->aux == 0) {
-                                       ++n_tot;
+                                       ++nt;
                                        if (p->indel != 0) {
-                                               ++n_alt;
+                                               ++na;
                                                aux[m++] = MINUS_CONST + p->indel;
                                        }
                                }
                                j = bam_cigar2qlen(&p->b->core, bam1_cigar(p->b));
                                if (j > max_rd_len) max_rd_len = j;
                        }
+            float frac = (float)na/nt;
+            if ( !indel_support_ok && na >= bca->min_support && frac >= bca->min_frac )
+                indel_support_ok = 1;
+            if ( na > bca->max_support && frac > 0 ) bca->max_support = na, bca->max_frac = frac;
+            n_alt += na; 
+            n_tot += nt;
                }
+        // To prevent long stretches of N's to be mistaken for indels (sometimes thousands of bases),
+        //  check the number of N's in the sequence and skip places where half or more reference bases are Ns.
+        int nN=0; for (i=pos; i-pos<max_rd_len && ref[i]; i++) if ( ref[i]=='N' ) nN++;
+        if ( nN*2>i ) { free(aux); return -1; }
+
                ks_introsort(uint32_t, m, aux);
                // squeeze out identical types
                for (i = 1, n_types = 1; i < m; ++i)
                        if (aux[i] != aux[i-1]) ++n_types;
-               if (n_types == 1 || n_alt * MIN_SUPPORT_COEF < n_tot) { // no indels or too few supporting reads
-                       free(aux); return -1;
+        // Taking totals makes it hard to call rare indels
+        if ( !bca->per_sample_flt )
+            indel_support_ok = ( (float)n_alt / n_tot < bca->min_frac || n_alt < bca->min_support ) ? 0 : 1;
+        if ( n_types == 1 || !indel_support_ok ) { // then skip
+            free(aux); return -1;
+        }
+               if (n_types >= 64) {
+                       free(aux);
+                       if (bam_verbose >= 2) 
+                               fprintf(stderr, "[%s] excessive INDEL alleles at position %d. Skip the position.\n", __func__, pos + 1);
+                       return -1;
                }
                types = (int*)calloc(n_types, sizeof(int));
                t = 0;
@@ -178,7 +200,6 @@ int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_calla
                for (t = 0; t < n_types; ++t)
                        if (types[t] == 0) break;
                ref_type = t; // the index of the reference type (0)
-               assert(n_types < 64);
        }
        { // calculate left and right boundary
                left = pos > INDEL_WINDOW_SIZE? pos - INDEL_WINDOW_SIZE : 0;
@@ -189,6 +210,58 @@ int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_calla
                        if (ref[i] == 0) break;
                right = i;
        }
+       /* The following block fixes a long-existing flaw in the INDEL
+        * calling model: the interference of nearby SNPs. However, it also
+        * reduces the power because sometimes, substitutions caused by
+        * indels are not distinguishable from true mutations. Multiple
+        * sequence realignment helps to increase the power.
+        */
+       { // construct per-sample consensus
+               int L = right - left + 1, max_i, max2_i;
+               uint32_t *cns, max, max2;
+               char *ref0, *r;
+               ref_sample = calloc(n, sizeof(void*));
+               cns = calloc(L, 4);
+               ref0 = calloc(L, 1);
+               for (i = 0; i < right - left; ++i)
+                       ref0[i] = bam_nt16_table[(int)ref[i+left]];
+               for (s = 0; s < n; ++s) {
+                       r = ref_sample[s] = calloc(L, 1);
+                       memset(cns, 0, sizeof(int) * L);
+                       // collect ref and non-ref counts
+                       for (i = 0; i < n_plp[s]; ++i) {
+                               bam_pileup1_t *p = plp[s] + i;
+                               bam1_t *b = p->b;
+                               uint32_t *cigar = bam1_cigar(b);
+                               uint8_t *seq = bam1_seq(b);
+                               int x = b->core.pos, y = 0;
+                               for (k = 0; k < b->core.n_cigar; ++k) {
+                                       int op = cigar[k]&0xf;
+                                       int j, l = cigar[k]>>4;
+                                       if (op == BAM_CMATCH || op == BAM_CEQUAL || op == BAM_CDIFF) {
+                                               for (j = 0; j < l; ++j)
+                                                       if (x + j >= left && x + j < right)
+                                                               cns[x+j-left] += (bam1_seqi(seq, y+j) == ref0[x+j-left])? 1 : 0x10000;
+                                               x += l; y += l;
+                                       } else if (op == BAM_CDEL || op == BAM_CREF_SKIP) x += l;
+                                       else if (op == BAM_CINS || op == BAM_CSOFT_CLIP) y += l;
+                               }
+                       }
+                       // determine the consensus
+                       for (i = 0; i < right - left; ++i) r[i] = ref0[i];
+                       max = max2 = 0; max_i = max2_i = -1;
+                       for (i = 0; i < right - left; ++i) {
+                               if (cns[i]>>16 >= max>>16) max2 = max, max2_i = max_i, max = cns[i], max_i = i;
+                               else if (cns[i]>>16 >= max2>>16) max2 = cns[i], max2_i = i;
+                       }
+                       if ((double)(max&0xffff) / ((max&0xffff) + (max>>16)) >= 0.7) max_i = -1;
+                       if ((double)(max2&0xffff) / ((max2&0xffff) + (max2>>16)) >= 0.7) max2_i = -1;
+                       if (max_i >= 0) r[max_i] = 15;
+                       if (max2_i >= 0) r[max2_i] = 15;
+//                     for (i = 0; i < right - left; ++i) fputc("=ACMGRSVTWYHKDBN"[(int)r[i]], stderr); fputc('\n', stderr);
+               }
+               free(ref0); free(cns);
+       }
        { // the length of the homopolymer run around the current position
                int c = bam_nt16_table[(int)ref[pos + 1]];
                if (c == 15) l_run = 1;
@@ -236,7 +309,8 @@ int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_calla
                free(inscns_aux);
        }
        // compute the likelihood given each type of indel for each read
-       ref2  = calloc(right - left + max_ins + 2, 1);
+       max_ref2 = right - left + 2 + 2 * (max_ins > -types[0]? max_ins : -types[0]);
+       ref2  = calloc(max_ref2, 1);
        query = calloc(right - left + max_rd_len + max_ins + 2, 1);
        score1 = calloc(N * n_types, sizeof(int));
        score2 = calloc(N * n_types, sizeof(int));
@@ -251,26 +325,29 @@ int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_calla
                else ir = est_indelreg(pos, ref, -types[t], 0);
                if (ir > bca->indelreg) bca->indelreg = ir;
 //             fprintf(stderr, "%d, %d, %d\n", pos, types[t], ir);
-               // write ref2
-               for (k = 0, j = left; j <= pos; ++j)
-                       ref2[k++] = bam_nt16_nt4_table[bam_nt16_table[(int)ref[j]]];
-               if (types[t] <= 0) j += -types[t];
-               else for (l = 0; l < types[t]; ++l)
-                                ref2[k++] = inscns[t*max_ins + l];
-               if (types[0] < 0) { // mask deleted sequences to avoid a particular error in the model.
-                       int jj, tmp = types[t] >= 0? -types[0] : -types[0] + types[t];
-                       for (jj = 0; jj < tmp && j < right && ref[j]; ++jj, ++j)
-                               ref2[k++] = 4;
-               }
-               for (; j < right && ref[j]; ++j)
-                       ref2[k++] = bam_nt16_nt4_table[bam_nt16_table[(int)ref[j]]];
-               if (j < right) right = j;
-               // align each read to ref2
+               // realignment
                for (s = K = 0; s < n; ++s) {
+                       // write ref2
+                       for (k = 0, j = left; j <= pos; ++j)
+                               ref2[k++] = bam_nt16_nt4_table[(int)ref_sample[s][j-left]];
+                       if (types[t] <= 0) j += -types[t];
+                       else for (l = 0; l < types[t]; ++l)
+                                        ref2[k++] = inscns[t*max_ins + l];
+                       for (; j < right && ref[j]; ++j)
+                               ref2[k++] = bam_nt16_nt4_table[(int)ref_sample[s][j-left]];
+                       for (; k < max_ref2; ++k) ref2[k] = 4;
+                       if (j < right) right = j;
+                       // align each read to ref2
                        for (i = 0; i < n_plp[s]; ++i, ++K) {
                                bam_pileup1_t *p = plp[s] + i;
-                               int qbeg, qend, tbeg, tend, sc;
+                               int qbeg, qend, tbeg, tend, sc, kk;
                                uint8_t *seq = bam1_seq(p->b);
+                               uint32_t *cigar = bam1_cigar(p->b);
+                               if (p->b->core.flag&4) continue; // unmapped reads
+                               // FIXME: the following loop should be better moved outside; nonetheless, realignment should be much slower anyway.
+                               for (kk = 0; kk < p->b->core.n_cigar; ++kk)
+                                       if ((cigar[kk]&BAM_CIGAR_MASK) == BAM_CREF_SKIP) break;
+                               if (kk < p->b->core.n_cigar) continue;
                                // FIXME: the following skips soft clips, but using them may be more sensitive.
                                // determine the start and end of sequences for alignment
                                qbeg = tpos2qpos(&p->b->core, bam1_cigar(p->b), left,  0, &tbeg);
@@ -365,9 +442,11 @@ int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_calla
                                indelQ2 = tmp > 111? 0 : (int)((1. - tmp/111.) * indelQ2 + .499);
                                // pick the smaller between indelQ1 and indelQ2
                                indelQ = indelQ1 < indelQ2? indelQ1 : indelQ2;
-                               p->aux = (sc[0]&0x3f)<<16 | seqQ<<8 | indelQ;
+                               if (indelQ > 255) indelQ = 255;
+                               if (seqQ > 255) seqQ = 255;
+                               p->aux = (sc[0]&0x3f)<<16 | seqQ<<8 | indelQ; // use 22 bits in total
                                sumq[sc[0]&0x3f] += indelQ < seqQ? indelQ : seqQ;
-//                             fprintf(stderr, "pos=%d read=%d:%d name=%s call=%d q=%d\n", pos, s, i, bam1_qname(p->b), types[sc[0]&0x3f], indelQ);
+//                             fprintf(stderr, "pos=%d read=%d:%d name=%s call=%d indelQ=%d seqQ=%d\n", pos, s, i, bam1_qname(p->b), types[sc[0]&0x3f], indelQ, seqQ);
                        }
                }
                // determine bca->indel_types[] and bca->inscns
@@ -405,261 +484,8 @@ int bcf_call_gap_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_calla
        }
        free(score1); free(score2);
        // free
+       for (i = 0; i < n; ++i) free(ref_sample[i]);
+       free(ref_sample);
        free(types); free(inscns);
        return n_alt > 0? 0 : -1;
 }
-
-#define END_SKIP 4 // must be larger than B2B_MAX_MNP
-#define MIN_MNP_FLANK_BAQ 20
-
-// the following routine is modified from bcf_call_gap_prep()
-int bcf_call_mnp_prep(int n, int *n_plp, bam_pileup1_t **plp, int pos, bcf_callaux_t *bca, const char *ref)
-{
-       extern void ks_introsort_uint32_t(int, uint32_t*);
-       int i, s, j, k, t, n_types, *types, max_rd_len, left, right, *score1;
-       int N, K, ref_seq, ref_type, n_alt;
-       char *ref2, *query;
-       uint8_t *_seqQ;
-       if (ref == 0 || bca == 0) return -1;
-       if (pos < bca->last_mnp_pos + B2B_MNP_WIN) return -2; // to avoid calling a TNP multiple times
-       if (pos < END_SKIP || ref[pos] == 0 || ref[pos+1] == 0) return -2; // end of the reference
-       { // determine if there is an MNP
-               int r[2];
-               uint8_t *tt;
-               r[0] = bam_nt16_table[(int)ref[pos]];
-               r[1] = bam_nt16_table[(int)ref[pos+1]];
-               for (s = 0; s < n; ++s) {
-                       for (i = 0; i < n_plp[s]; ++i) {
-                               bam_pileup1_t *p = plp[s] + i;
-                               int left, rght;
-                               if (p->qpos < END_SKIP || p->qpos >= p->b->core.l_qseq - END_SKIP) continue;
-                               tt = bam1_seq(p->b);
-                               if (bam1_seqi(tt, p->qpos) == r[0] || bam1_seqi(tt, p->qpos+1) == r[1]) continue; // no MNP
-                               tt = bam1_qual(p->b);
-                               for (left = 0, k = p->qpos - END_SKIP; k <= p->qpos; ++k)
-                                       left = left > tt[k]? left : tt[k];
-                               for (rght = 0, k = p->qpos; k < p->b->core.l_qseq - END_SKIP; ++k)
-                                       rght = rght > tt[k]? left : tt[k];
-                               if (left >= MIN_MNP_FLANK_BAQ && rght >= MIN_MNP_FLANK_BAQ) break; // bracketed by good bases
-                       }
-                       if (i != n_plp[s]) break;
-               }
-               if (s == n) return -1; // there is no MNP at this position.
-       }
-       for (s = N = 0; s < n; ++s) N += n_plp[s]; // N is the total number of reads
-       { // construct the MNP consensus
-               uint8_t *tt;
-               uint32_t *aux, x, *cnt;
-               int m;
-               m = max_rd_len = 0;
-               aux = calloc(N + 1, 4);
-               for (i = 0, x = 0; i < B2B_MAX_MNP; ++i)
-                       x |= bam_nt16_nt4_table[bam_nt16_table[(int)ref[pos+i]]] << 2*i;
-               ref_seq = aux[m++] = x;
-               bca->indelreg = 0;
-               for (s = 0; s < n; ++s) {
-                       for (i = 0; i < n_plp[s]; ++i) {
-                               bam_pileup1_t *p = plp[s] + i;
-                               int stop;
-                               j = bam_cigar2qlen(&p->b->core, bam1_cigar(p->b));
-                               if (j > max_rd_len) max_rd_len = j;
-                               if (p->qpos < END_SKIP || p->qpos >= p->b->core.l_qseq - END_SKIP) continue;
-                               tt = bam1_seq(p->b);
-                               for (k = j = stop = 0, x = 0; k < B2B_MAX_MNP; ++k) {
-                                       int c = bam_nt16_nt4_table[bam1_seqi(tt, p->qpos + k)];
-                                       if (c > 3) break;
-                                       if (c != (ref_seq>>k*2&3) && !stop) ++j;
-                                       else stop = 1;
-                                       x |= c << 2*k;
-                               }
-//                             fprintf(stderr, "* %d, %d\n", x, j);
-                               if (k == B2B_MAX_MNP && j >= 2) aux[m++] = x;
-                       }
-               }
-               ks_introsort(uint32_t, m, aux);
-               // squeeze out indentical types
-               for (i = 1, n_types = 1; i < m; ++i)
-                       if (aux[i] != aux[i-1]) ++n_types;
-               if (n_types == 1) { // no indels
-                       free(aux); return -1;
-               }
-               // count reads for each type
-               cnt = alloca(n_types * 4);
-               cnt[0] = 1<<8 | aux[0];
-               for (i = 1, t = 0; i < m; ++i) {
-                       if (aux[i] != aux[i-1]) {
-                               ++t;
-                               cnt[t] = 1<<8 | aux[i];
-                       } else cnt[t] += 1<<8;
-               }
-               free(aux);
-               // collect types
-               ks_introsort(uint32_t, n_types, cnt);
-               for (t = 0; t < n_types; ++t)
-                       if ((cnt[t]&0xff) == ref_seq) break;
-               if (t == n_types - 1) --t; // we get at least two types
-               types = (int*)calloc(n_types, sizeof(int));
-               for (i = 0; t < n_types; ++i, ++t) types[i] = cnt[t]&0xff;
-               n_types = i;
-               // calculate MNP length
-               for (i = B2B_MAX_MNP - 1, k = 0; i >= 0; --i) {
-                       int c = types[0] >> 2*i & 3;
-                       for (t = 1; t < n_types; ++t)
-                               if ((types[t] >> 2*i & 3) != c) break;
-                       if (t == n_types) ++k;
-                       else break;
-               }
-               bca->indelreg = B2B_MAX_MNP - k;
-               x = (1<<2*bca->indelreg) - 1;
-               for (t = 0; t < n_types; ++t) types[t] &= x;
-               ref_seq &= x;
-               for (t = 0; t < n_types; ++t)
-                       if (types[t] == ref_seq) break;
-               ref_type = t;
-//             fprintf(stderr, "%d, %d, [%x,%x] %d\n", pos, n_types, types[0], types[1], bca->indelreg);
-       }
-       { // calculate left and right boundary
-               left = pos > INDEL_WINDOW_SIZE? pos - INDEL_WINDOW_SIZE : 0;
-               right = pos + INDEL_WINDOW_SIZE;
-               // in case the alignments stand out the reference
-               for (i = pos; i < right; ++i)
-                       if (ref[i] == 0) break;
-               right = i;
-       }
-       { // find the highest base quality
-               _seqQ = calloc(N, 1);
-               for (s = K = 0; s < n; ++s) {
-                       for (i = 0; i < n_plp[s]; ++i, ++K) {
-                               bam_pileup1_t *p = plp[s] + i;
-                               uint8_t *qq, *bq;
-                               int max = 0;
-                               qq = bam1_qual(p->b);
-                               bq = (uint8_t*)bam_aux_get(p->b, "ZQ");
-                               if (bq) ++bq;
-                               for (j = p->qpos; j < p->b->core.l_qseq && j < p->qpos + bca->indelreg; ++j) {
-                                       int q = bq? qq[j] + (bq[j] - 64) : qq[j];
-                                       max = max > q? max : q;
-                               }
-                               _seqQ[K] = max;
-                       }
-               }
-       }
-       // compute the likelihood given each type of indel for each read
-       ref2  = calloc(right - left + 2, 1);
-       query = calloc(right - left + max_rd_len + 2, 1);
-       score1 = calloc(N * n_types, sizeof(int));
-       for (t = 0; t < n_types; ++t) {
-               int l;
-               kpa_par_t apf1 = { 1e-4, 1e-2, 10 };
-               apf1.bw = abs(types[t]) + 3;
-               // write ref2
-               for (k = 0, j = left; j < pos; ++j)
-                       ref2[k++] = bam_nt16_nt4_table[bam_nt16_table[(int)ref[j]]];
-               for (i = 0; i < bca->indelreg; ++i, ++j)
-                       ref2[k++] = types[t]>>2*i&3;
-               for (; j < right && ref[j]; ++j)
-                       ref2[k++] = bam_nt16_nt4_table[bam_nt16_table[(int)ref[j]]];
-               if (j < right) right = j;
-               // align each read to ref2
-               for (s = K = 0; s < n; ++s) {
-                       for (i = 0; i < n_plp[s]; ++i, ++K) {
-                               bam_pileup1_t *p = plp[s] + i;
-                               int qbeg, qend, tbeg, tend, sc;
-                               uint8_t *seq = bam1_seq(p->b);
-                               // determine the start and end of sequences for alignment
-                               qbeg = tpos2qpos(&p->b->core, bam1_cigar(p->b), left,  0, &tbeg);
-                               qend = tpos2qpos(&p->b->core, bam1_cigar(p->b), right, 1, &tend);
-                               // write the query sequence
-                               for (l = qbeg; l < qend; ++l)
-                                       query[l - qbeg] = bam_nt16_nt4_table[bam1_seqi(seq, l)];
-                               { // do realignment; this is the bottleneck
-                                       const uint8_t *qual = bam1_qual(p->b), *bq;
-                                       uint8_t *qq;
-                                       qq = calloc(qend - qbeg, 1);
-                                       bq = (uint8_t*)bam_aux_get(p->b, "ZQ");
-                                       if (bq) ++bq; // skip type
-                                       for (l = qbeg; l < qend; ++l) {
-                                               qq[l - qbeg] = bq? qual[l] + (bq[l] - 64) : qual[l];
-                                               if (qq[l - qbeg] > 30) qq[l - qbeg] = 30;
-                                               if (qq[l - qbeg] < 7) qq[l - qbeg] = 7;
-                                       }
-                                       sc = kpa_glocal((uint8_t*)ref2 + tbeg - left, tend - tbeg,
-                                                                       (uint8_t*)query, qend - qbeg, qq, &apf1, 0, 0);
-                                       l = (int)(100. * sc / (qend - qbeg) + .499); // used for adjusting indelQ below
-                                       if (l > 255) l = 255;
-                                       score1[K*n_types + t] = sc<<8 | l;
-                                       free(qq);
-                               }
-/*
-                               for (l = 0; l < tend - tbeg; ++l)
-                                       fputc("ACGTN"[(int)ref2[tbeg-left+l]], stderr);
-                               fputc('\n', stderr);
-                               for (l = 0; l < qend - qbeg; ++l) fputc("ACGTN"[(int)query[l]], stderr);
-                               fputc('\n', stderr);
-                               fprintf(stderr, "pos=%d type=%d read=%d:%d name=%s qbeg=%d tbeg=%d score=%d\n", pos, types[t], s, i, bam1_qname(p->b), qbeg, tbeg, sc);
-*/
-                       }
-               }
-       }
-       free(ref2); free(query);
-       { // compute indelQ
-               int *sc, tmp, *sumq;
-               sc   = alloca(n_types * sizeof(int));
-               sumq = alloca(n_types * sizeof(int));
-               memset(sumq, 0, sizeof(int) * n_types);
-               for (s = K = 0; s < n; ++s) {
-                       for (i = 0; i < n_plp[s]; ++i, ++K) {
-                               bam_pileup1_t *p = plp[s] + i;
-                               int *sct = &score1[K*n_types], seqQ, indelQ;
-                               for (t = 0; t < n_types; ++t) sc[t] = sct[t]<<6 | t;
-                               for (t = 1; t < n_types; ++t) // insertion sort
-                                       for (j = t; j > 0 && sc[j] < sc[j-1]; --j)
-                                               tmp = sc[j], sc[j] = sc[j-1], sc[j-1] = tmp;
-                               if ((sc[0]&0x3f) == ref_type) {
-                                       indelQ = (sc[1]>>14) - (sc[0]>>14);
-                               } else {
-                                       for (t = 0; t < n_types; ++t) // look for the reference type
-                                               if ((sc[t]&0x3f) == ref_type) break;
-                                       indelQ = (sc[t]>>14) - (sc[0]>>14);
-                               }
-                               seqQ = _seqQ[K];
-                               tmp = sc[0]>>6 & 0xff;
-                               indelQ = tmp > 111? 0 : (int)((1. - tmp/111.) * indelQ + .499); // reduce indelQ
-                               p->aux = (sc[0]&0x3f)<<16 | seqQ<<8 | indelQ;
-                               sumq[sc[0]&0x3f] += indelQ < seqQ? indelQ : seqQ;
-                       }
-               }
-               // determine bca->indel_types[] and bca->inscns
-               for (t = 0; t < n_types; ++t)
-                       sumq[t] = sumq[t]<<6 | t;
-               for (t = 1; t < n_types; ++t) // insertion sort
-                       for (j = t; j > 0 && sumq[j] > sumq[j-1]; --j)
-                               tmp = sumq[j], sumq[j] = sumq[j-1], sumq[j-1] = tmp;
-               for (t = 0; t < n_types; ++t) // look for the reference type
-                       if ((sumq[t]&0x3f) == ref_type) break;
-               if (t) { // then move the reference type to the first
-                       tmp = sumq[t];
-                       for (; t > 0; --t) sumq[t] = sumq[t-1];
-                       sumq[0] = tmp;
-               }
-               for (t = 0; t < 4; ++t) bca->indel_types[t] = B2B_INDEL_NULL;
-               for (t = 0; t < 4 && t < n_types; ++t)
-                       bca->indel_types[t] = types[sumq[t]&0x3f];
-               // update p->aux
-               for (s = n_alt = 0; s < n; ++s) {
-                       for (i = 0; i < n_plp[s]; ++i) {
-                               bam_pileup1_t *p = plp[s] + i;
-                               int x = types[p->aux>>16&0x3f];
-                               for (j = 0; j < 4; ++j)
-                                       if (x == bca->indel_types[j]) break;
-                               p->aux = j<<16 | (j == 4? 0 : (p->aux&0xffff));
-                               if ((p->aux>>16&0x3f) > 0) ++n_alt;
-//                             fprintf(stderr, "X pos=%d read=%d:%d name=%s call=%d type=%d q=%d seqQ=%d\n", pos, s, i, bam1_qname(p->b), p->aux>>16&63, bca->indel_types[p->aux>>16&63], p->aux&0xff, p->aux>>8&0xff);
-                       }
-               }               
-       }
-       free(score1);
-       // free
-       free(types); free(_seqQ);
-       return n_alt > 0? 0 : -1;
-}