X-Git-Url: http://woldlab.caltech.edu/gitweb/?p=pysam.git;a=blobdiff_plain;f=samtools%2Fbam_md.c.pysam.c;fp=samtools%2Fbam_md.c.pysam.c;h=c6568b770200f4744b4255fc0fc14451c51a001a;hp=0000000000000000000000000000000000000000;hb=bd0c3067c187d1f718004fb38acc093af8810a02;hpb=1b740fc70684c92a5e2293013217d5a2fd661d8a

diff --git a/samtools/bam_md.c.pysam.c b/samtools/bam_md.c.pysam.c
new file mode 100644
index 0000000..c6568b7
--- /dev/null
+++ b/samtools/bam_md.c.pysam.c
@@ -0,0 +1,359 @@
+#include "pysam.h"
+
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+#include <math.h>
+#include "faidx.h"
+#include "sam.h"
+#include "kstring.h"
+#include "kaln.h"
+#include "kprobaln.h"
+
+char bam_nt16_nt4_table[] = { 4, 0, 1, 4, 2, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4 };
+
+void bam_fillmd1_core(bam1_t *b, char *ref, int is_equal, int max_nm)
+{
+	uint8_t *seq = bam1_seq(b);
+	uint32_t *cigar = bam1_cigar(b);
+	bam1_core_t *c = &b->core;
+	int i, x, y, u = 0;
+	kstring_t *str;
+	uint8_t *old_md, *old_nm;
+	int32_t old_nm_i = -1, nm = 0;
+
+	str = (kstring_t*)calloc(1, sizeof(kstring_t));
+	for (i = y = 0, x = c->pos; i < c->n_cigar; ++i) {
+		int j, l = cigar[i]>>4, op = cigar[i]&0xf;
+		if (op == BAM_CMATCH) {
+			for (j = 0; j < l; ++j) {
+				int z = y + j;
+				int c1 = bam1_seqi(seq, z), c2 = bam_nt16_table[(int)ref[x+j]];
+				if (ref[x+j] == 0) break; // out of boundary
+				if ((c1 == c2 && c1 != 15 && c2 != 15) || c1 == 0) { // a match
+					if (is_equal) seq[z/2] &= (z&1)? 0xf0 : 0x0f;
+					++u;
+				} else {
+					ksprintf(str, "%d", u);
+					kputc(ref[x+j], str);
+					u = 0; ++nm;
+				}
+			}
+			if (j < l) break;
+			x += l; y += l;
+		} else if (op == BAM_CDEL) {
+			ksprintf(str, "%d", u);
+			kputc('^', str);
+			for (j = 0; j < l; ++j) {
+				if (ref[x+j] == 0) break;
+				kputc(ref[x+j], str);
+			}
+			u = 0;
+			if (j < l) break;
+			x += l; nm += l;
+		} else if (op == BAM_CINS || op == BAM_CSOFT_CLIP) {
+			y += l;
+			if (op == BAM_CINS) nm += l;
+		} else if (op == BAM_CREF_SKIP) {
+			x += l;
+		}
+	}
+	ksprintf(str, "%d", u);
+	// apply max_nm
+	if (max_nm > 0 && nm >= max_nm) {
+		for (i = y = 0, x = c->pos; i < c->n_cigar; ++i) {
+			int j, l = cigar[i]>>4, op = cigar[i]&0xf;
+			if (op == BAM_CMATCH) {
+				for (j = 0; j < l; ++j) {
+					int z = y + j;
+					int c1 = bam1_seqi(seq, z), c2 = bam_nt16_table[(int)ref[x+j]];
+					if (ref[x+j] == 0) break; // out of boundary
+					if ((c1 == c2 && c1 != 15 && c2 != 15) || c1 == 0) { // a match
+						seq[z/2] |= (z&1)? 0x0f : 0xf0;
+						bam1_qual(b)[z] = 0;
+					}
+				}
+				if (j < l) break;
+				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;
+		}
+	}
+	// update NM
+	old_nm = bam_aux_get(b, "NM");
+	if (c->flag & BAM_FUNMAP) return;
+	if (old_nm) old_nm_i = bam_aux2i(old_nm);
+	if (!old_nm) bam_aux_append(b, "NM", 'i', 4, (uint8_t*)&nm);
+	else if (nm != old_nm_i) {
+		fprintf(pysamerr, "[bam_fillmd1] different NM for read '%s': %d -> %d\n", bam1_qname(b), old_nm_i, nm);
+		bam_aux_del(b, old_nm);
+		bam_aux_append(b, "NM", 'i', 4, (uint8_t*)&nm);
+	}
+	// update MD
+	old_md = bam_aux_get(b, "MD");
+	if (!old_md) bam_aux_append(b, "MD", 'Z', str->l + 1, (uint8_t*)str->s);
+	else {
+		int is_diff = 0;
+		if (strlen((char*)old_md+1) == str->l) {
+			for (i = 0; i < str->l; ++i)
+				if (toupper(old_md[i+1]) != toupper(str->s[i]))
+					break;
+			if (i < str->l) is_diff = 1;
+		} else is_diff = 1;
+		if (is_diff) {
+			fprintf(pysamerr, "[bam_fillmd1] different MD for read '%s': '%s' -> '%s'\n", bam1_qname(b), old_md+1, str->s);
+			bam_aux_del(b, old_md);
+			bam_aux_append(b, "MD", 'Z', str->l + 1, (uint8_t*)str->s);
+		}
+	}
+	free(str->s); free(str);
+}
+
+void bam_fillmd1(bam1_t *b, char *ref, int is_equal)
+{
+	bam_fillmd1_core(b, ref, is_equal, 0);
+}
+
+int bam_cap_mapQ(bam1_t *b, char *ref, int thres)
+{
+	uint8_t *seq = bam1_seq(b), *qual = bam1_qual(b);
+	uint32_t *cigar = bam1_cigar(b);
+	bam1_core_t *c = &b->core;
+	int i, x, y, mm, q, len, clip_l, clip_q;
+	double t;
+	if (thres < 0) thres = 40; // set the default
+	mm = q = len = clip_l = clip_q = 0;
+	for (i = y = 0, x = c->pos; i < c->n_cigar; ++i) {
+		int j, l = cigar[i]>>4, op = cigar[i]&0xf;
+		if (op == BAM_CMATCH) {
+			for (j = 0; j < l; ++j) {
+				int z = y + j;
+				int c1 = bam1_seqi(seq, z), c2 = bam_nt16_table[(int)ref[x+j]];
+				if (ref[x+j] == 0) break; // out of boundary
+				if (c2 != 15 && c1 != 15 && qual[z] >= 13) { // not ambiguous
+					++len;
+					if (c1 && c1 != c2 && qual[z] >= 13) { // mismatch
+						++mm;
+						q += qual[z] > 33? 33 : qual[z];
+					}
+				}
+			}
+			if (j < l) break;
+			x += l; y += l; len += l;
+		} else if (op == BAM_CDEL) {
+			for (j = 0; j < l; ++j)
+				if (ref[x+j] == 0) break;
+			if (j < l) break;
+			x += l;
+		} else if (op == BAM_CSOFT_CLIP) {
+			for (j = 0; j < l; ++j) clip_q += qual[y+j];
+			clip_l += l;
+			y += l;
+		} else if (op == BAM_CHARD_CLIP) {
+			clip_q += 13 * l;
+			clip_l += l;
+		} else if (op == BAM_CINS) y += l;
+		else if (op == BAM_CREF_SKIP) x += l;
+	}
+	for (i = 0, t = 1; i < mm; ++i)
+		t *= (double)len / (i+1);
+	t = q - 4.343 * log(t) + clip_q / 5.;
+	if (t > thres) return -1;
+	if (t < 0) t = 0;
+	t = sqrt((thres - t) / thres) * thres;
+//	fprintf(pysamerr, "%s %lf %d\n", bam1_qname(b), t, q);
+	return (int)(t + .499);
+}
+
+int bam_prob_realn_core(bam1_t *b, const char *ref, int flag)
+{
+	int k, i, bw, x, y, yb, ye, xb, xe, apply_baq = flag&1, extend_baq = flag>>1&1;
+	uint32_t *cigar = bam1_cigar(b);
+	bam1_core_t *c = &b->core;
+	kpa_par_t conf = kpa_par_def;
+	uint8_t *bq = 0, *zq = 0, *qual = bam1_qual(b);
+	if ((c->flag & BAM_FUNMAP) || b->core.l_qseq == 0) return -1; // do nothing
+	// test if BQ or ZQ is present
+	if ((bq = bam_aux_get(b, "BQ")) != 0) ++bq;
+	if ((zq = bam_aux_get(b, "ZQ")) != 0 && *zq == 'Z') ++zq;
+	if (bq && zq) { // remove the ZQ tag
+		bam_aux_del(b, zq-1);
+		zq = 0;
+	}
+	if (bq || zq) {
+		if ((apply_baq && zq) || (!apply_baq && bq)) return -3; // in both cases, do nothing
+		if (bq && apply_baq) { // then convert BQ to ZQ
+			for (i = 0; i < c->l_qseq; ++i)
+				qual[i] = qual[i] + 64 < bq[i]? 0 : qual[i] - ((int)bq[i] - 64);
+			*(bq - 3) = 'Z';
+		} else if (zq && !apply_baq) { // then convert ZQ to BQ
+			for (i = 0; i < c->l_qseq; ++i)
+				qual[i] += (int)zq[i] - 64;
+			*(zq - 3) = 'B';
+		}
+		return 0;
+	}
+	// find the start and end of the alignment	
+	x = c->pos, y = 0, yb = ye = xb = xe = -1;
+	for (k = 0; k < c->n_cigar; ++k) {
+		int op, l;
+		op = cigar[k]&0xf; l = cigar[k]>>4;
+		if (op == BAM_CMATCH) {
+			if (yb < 0) yb = y;
+			if (xb < 0) xb = x;
+			ye = y + l; xe = x + l;
+			x += l; y += l;
+		} else if (op == BAM_CSOFT_CLIP || op == BAM_CINS) y += l;
+		else if (op == BAM_CDEL) x += l;
+		else if (op == BAM_CREF_SKIP) return -1; // do nothing if there is a reference skip
+	}
+	// set bandwidth and the start and the end
+	bw = 7;
+	if (abs((xe - xb) - (ye - yb)) > bw)
+		bw = abs((xe - xb) - (ye - yb)) + 3;
+	conf.bw = bw;
+	xb -= yb + bw/2; if (xb < 0) xb = 0;
+	xe += c->l_qseq - ye + bw/2;
+	if (xe - xb - c->l_qseq > bw)
+		xb += (xe - xb - c->l_qseq - bw) / 2, xe -= (xe - xb - c->l_qseq - bw) / 2;
+	{ // glocal
+		uint8_t *s, *r, *q, *seq = bam1_seq(b), *bq;
+		int *state;
+		bq = calloc(c->l_qseq + 1, 1);
+		memcpy(bq, qual, c->l_qseq);
+		s = calloc(c->l_qseq, 1);
+		for (i = 0; i < c->l_qseq; ++i) s[i] = bam_nt16_nt4_table[bam1_seqi(seq, i)];
+		r = calloc(xe - xb, 1);
+		for (i = xb; i < xe; ++i) {
+			if (ref[i] == 0) { xe = i; break; }
+			r[i-xb] = bam_nt16_nt4_table[bam_nt16_table[(int)ref[i]]];
+		}
+		state = calloc(c->l_qseq, sizeof(int));
+		q = calloc(c->l_qseq, 1);
+		kpa_glocal(r, xe-xb, s, c->l_qseq, qual, &conf, state, q);
+		if (!extend_baq) { // in this block, bq[] is capped by base quality qual[]
+			for (k = 0, x = c->pos, y = 0; k < c->n_cigar; ++k) {
+				int op = cigar[k]&0xf, l = cigar[k]>>4;
+				if (op == BAM_CMATCH) {
+					for (i = y; i < y + l; ++i) {
+						if ((state[i]&3) != 0 || state[i]>>2 != x - xb + (i - y)) bq[i] = 0;
+						else bq[i] = bq[i] < q[i]? bq[i] : q[i];
+					}
+					x += l; y += l;
+				} else if (op == BAM_CSOFT_CLIP || op == BAM_CINS) y += l;
+				else if (op == BAM_CDEL) x += l;
+			}
+			for (i = 0; i < c->l_qseq; ++i) bq[i] = qual[i] - bq[i] + 64; // finalize BQ
+		} else { // in this block, bq[] is BAQ that can be larger than qual[] (different from the above!)
+			uint8_t *left, *rght;
+			left = calloc(c->l_qseq, 1); rght = calloc(c->l_qseq, 1);
+			for (k = 0, x = c->pos, y = 0; k < c->n_cigar; ++k) {
+				int op = cigar[k]&0xf, l = cigar[k]>>4;
+				if (op == BAM_CMATCH) {
+					for (i = y; i < y + l; ++i)
+						bq[i] = ((state[i]&3) != 0 || state[i]>>2 != x - xb + (i - y))? 0 : q[i];
+					for (left[y] = bq[y], i = y + 1; i < y + l; ++i)
+						left[i] = bq[i] > left[i-1]? bq[i] : left[i-1];
+					for (rght[y+l-1] = bq[y+l-1], i = y + l - 2; i >= y; --i)
+						rght[i] = bq[i] > rght[i+1]? bq[i] : rght[i+1];
+					for (i = y; i < y + l; ++i)
+						bq[i] = left[i] < rght[i]? left[i] : rght[i];
+					x += l; y += l;
+				} else if (op == BAM_CSOFT_CLIP || op == BAM_CINS) y += l;
+				else if (op == BAM_CDEL) x += l;
+			}
+			for (i = 0; i < c->l_qseq; ++i) bq[i] = 64 + (qual[i] <= bq[i]? 0 : qual[i] - bq[i]); // finalize BQ
+			free(left); free(rght);
+		}
+		if (apply_baq) {
+			for (i = 0; i < c->l_qseq; ++i) qual[i] -= bq[i] - 64; // modify qual
+			bam_aux_append(b, "ZQ", 'Z', c->l_qseq + 1, bq);
+		} else bam_aux_append(b, "BQ", 'Z', c->l_qseq + 1, bq);
+		free(bq); free(s); free(r); free(q); free(state);
+	}
+	return 0;
+}
+
+int bam_prob_realn(bam1_t *b, const char *ref)
+{
+	return bam_prob_realn_core(b, ref, 1);
+}
+
+int bam_fillmd(int argc, char *argv[])
+{
+	int c, is_equal, tid = -2, ret, len, is_bam_out, is_sam_in, is_uncompressed, max_nm, is_realn, capQ, baq_flag;
+	samfile_t *fp, *fpout = 0;
+	faidx_t *fai;
+	char *ref = 0, mode_w[8], mode_r[8];
+	bam1_t *b;
+
+	is_equal = is_bam_out = is_sam_in = is_uncompressed = is_realn = max_nm = capQ = baq_flag = 0;
+	mode_w[0] = mode_r[0] = 0;
+	strcpy(mode_r, "r"); strcpy(mode_w, "w");
+	while ((c = getopt(argc, argv, "EreubSC:n:A")) >= 0) {
+		switch (c) {
+		case 'r': is_realn = 1; break;
+		case 'e': is_equal = 1; break;
+		case 'b': is_bam_out = 1; break;
+		case 'u': is_uncompressed = is_bam_out = 1; break;
+		case 'S': is_sam_in = 1; break;
+		case 'n': max_nm = atoi(optarg); break;
+		case 'C': capQ = atoi(optarg); break;
+		case 'A': baq_flag |= 1; break;
+		case 'E': baq_flag |= 2; break;
+		default: fprintf(pysamerr, "[bam_fillmd] unrecognized option '-%c'\n", c); return 1;
+		}
+	}
+	if (!is_sam_in) strcat(mode_r, "b");
+	if (is_bam_out) strcat(mode_w, "b");
+	else strcat(mode_w, "h");
+	if (is_uncompressed) strcat(mode_w, "u");
+	if (optind + 1 >= argc) {
+		fprintf(pysamerr, "\n");
+		fprintf(pysamerr, "Usage:   samtools fillmd [-eubrS] <aln.bam> <ref.fasta>\n\n");
+		fprintf(pysamerr, "Options: -e       change identical bases to '='\n");
+		fprintf(pysamerr, "         -u       uncompressed BAM output (for piping)\n");
+		fprintf(pysamerr, "         -b       compressed BAM output\n");
+		fprintf(pysamerr, "         -S       the input is SAM with header\n");
+		fprintf(pysamerr, "         -A       modify the quality string\n");
+		fprintf(pysamerr, "         -r       compute the BQ tag (without -A) or cap baseQ by BAQ (with -A)\n");
+		fprintf(pysamerr, "         -E       extended BAQ for better sensitivity but lower specificity\n\n");
+		return 1;
+	}
+	fp = samopen(argv[optind], mode_r, 0);
+	if (fp == 0) return 1;
+	if (is_sam_in && (fp->header == 0 || fp->header->n_targets == 0)) {
+		fprintf(pysamerr, "[bam_fillmd] input SAM does not have header. Abort!\n");
+		return 1;
+	}
+	fpout = samopen("-", mode_w, fp->header);
+	fai = fai_load(argv[optind+1]);
+
+	b = bam_init1();
+	while ((ret = samread(fp, b)) >= 0) {
+		if (b->core.tid >= 0) {
+			if (tid != b->core.tid) {
+				free(ref);
+				ref = fai_fetch(fai, fp->header->target_name[b->core.tid], &len);
+				tid = b->core.tid;
+				if (ref == 0)
+					fprintf(pysamerr, "[bam_fillmd] fail to find sequence '%s' in the reference.\n",
+							fp->header->target_name[tid]);
+			}
+			if (is_realn) bam_prob_realn_core(b, ref, baq_flag);
+			if (capQ > 10) {
+				int q = bam_cap_mapQ(b, ref, capQ);
+				if (b->core.qual > q) b->core.qual = q;
+			}
+			if (ref) bam_fillmd1_core(b, ref, is_equal, max_nm);
+		}
+		samwrite(fpout, b);
+	}
+	bam_destroy1(b);
+
+	free(ref);
+	fai_destroy(fai);
+	samclose(fp); samclose(fpout);
+	return 0;
+}