X-Git-Url: https://git.donarmstrong.com/?p=rsem.git;a=blobdiff_plain;f=BamConverter.h;h=d2b8b7324df6d61b59e3f03d92dbe0a4941a3bff;hp=320824b5f93a266d3e451dc4ec3a757c4a1dadd4;hb=HEAD;hpb=102cd7714dbd1c1c13d0f4736ec1b1523b359978

diff --git a/BamConverter.h b/BamConverter.h
index 320824b..d2b8b73 100644
--- a/BamConverter.h
+++ b/BamConverter.h
@@ -39,7 +39,7 @@ private:
 	void writeCollapsedLines();
 	void flipSeq(uint8_t*, int);
 	void flipQual(uint8_t*, int);
-	void addXSTag(bam1_t*, const Transcript&);
+	void modifyTags(bam1_t*, const Transcript&); // modify MD tag and XS tag if needed
 };
 
 BamConverter::BamConverter(const char* inpF, const char* outF, const char* chr_list, Transcripts& transcripts)
@@ -53,12 +53,35 @@ BamConverter::BamConverter(const char* inpF, const char* outF, const char* chr_l
 	transcripts.buildMappings(in->header->n_targets, in->header->target_name);
 
 	bam_header_t *out_header = sam_header_read2(chr_list);
+
 	refmap.clear();
 	for (int i = 0; i < out_header->n_targets; i++) {
 		refmap[out_header->target_name[i]] = i;
 	}
 
-	append_header_text(out_header, in->header->text, in->header->l_text);
+	if (in->header->l_text > 0) {
+		char comment[] = "@CO\tThis BAM file is processed by rsem-tbam2gam to convert from transcript coordinates into genomic coordinates.\n";
+		int comment_len = strlen(comment);
+
+		//Filter @SQ fields if the BAM file is user provided
+		char *text = in->header->text;
+		int l_text = in->header->l_text;
+		char *new_text = new char[l_text + comment_len];
+		int pos = 0, s = 0;
+		while (pos < l_text) {
+			if ((pos + 2 < l_text) && (text[pos] == '@') && (text[pos + 1] == 'S') && (text[pos + 2] == 'Q')) {
+				pos += 3;
+				while (pos < l_text && text[pos] != '\n') ++pos;
+			}
+			else new_text[s++] = text[pos];
+			++pos;
+		}
+		strncpy(new_text + s, comment, comment_len);
+		s += comment_len;
+
+		append_header_text(out_header, new_text, s);
+		delete[] new_text;
+	}
 
 	out = samopen(outF, "wb", out_header);
 	assert(out != 0);
@@ -96,40 +119,47 @@ void BamConverter::process() {
 		// at least one segment is not properly mapped
 		bool notgood = (b->core.flag & 0x0004) || (isPaired && (b2->core.flag & 0x0004));
 		
+		if (isPaired && notgood) general_assert((b->core.flag & 0x0004) && (b2->core.flag & 0x0004), cstrtos(bam1_qname(b)) + "'s two mates are not all marked as unalignable!");
+
+		if (!notgood) {
+			// for collapsing
+			if (isPaired) {
+				assert(b->core.tid == b2->core.tid);
+				general_assert(b->core.tid == b2->core.tid, cstrtos(bam1_qname(b)) + "'s two mates are aligned to two different transcripts!");
+				if ((b->core.flag & 0x0080) && (b2->core.flag & 0x0040)) {
+					bam1_t *tmp = b; b = b2; b2 = tmp;
+				}
+			}
 
-		if (isPaired && notgood) assert((b->core.flag & 0x0004) && (b2->core.flag & 0x0004));
+			const Transcript& transcript = transcripts.getTranscriptViaEid(b->core.tid + 1);
 
+			convert(b, transcript);
+			if (isPaired) {
+				convert(b2, transcript);
+				b->core.mpos = b2->core.pos;
+				b2->core.mpos = b->core.pos;
+			}
 
-		if (!notgood) {
-		  if (isPaired) assert((b->core.tid == b2->core.tid) && (b->core.flag & 0x0040) && (b2->core.flag & 0x0080)); // for collapsing
-
-		  const Transcript& transcript = transcripts.getTranscriptViaEid(b->core.tid + 1);
-
-		  convert(b, transcript);
-		  if (isPaired) {
-		    convert(b2, transcript);
-		    b->core.mpos = b2->core.pos;
-		    b2->core.mpos = b->core.pos;
-		  }
-
-		  if (cqname != bam1_qname(b)) {
-		    writeCollapsedLines();
-		    cqname = bam1_qname(b);
-		    collapseMap.init(isPaired);
-		  }
-		  collapseMap.insert(b, b2, bam_aux2f(bam_aux_get(b, "ZW")));
+			if (cqname != bam1_qname(b)) {
+				writeCollapsedLines();
+				cqname = bam1_qname(b);
+				collapseMap.init(isPaired);
+			}
+
+			uint8_t *p = bam_aux_get(b, "ZW");
+			float prb = (p != NULL? bam_aux2f(p) : 1.0);
+			collapseMap.insert(b, b2, prb);
 		}
 		else {
-		  assert(cqname != bam1_qname(b));
+			assert(cqname != bam1_qname(b));
 
-		  writeCollapsedLines();
-		  cqname = bam1_qname(b);
-		  collapseMap.init(isPaired);
+			writeCollapsedLines();
+			cqname = bam1_qname(b);
+			collapseMap.init(isPaired);
 
-		  samwrite(out, b);
-		  if (isPaired) samwrite(out, b2);
+			samwrite(out, b);
+			if (isPaired) samwrite(out, b2);
 		}
-
 	}
 
 	writeCollapsedLines();
@@ -180,23 +210,29 @@ void BamConverter::convert(bam1_t* b, const Transcript& transcript) {
 	b->core.n_cigar = core_n_cigar;
 	b->core.bin = bam_reg2bin(b->core.pos, bam_calend(&(b->core), bam1_cigar(b)));
 
-	addXSTag(b, transcript); // check if need to add XS tag, if need, add it
+	modifyTags(b, transcript); // check if need to add XS tag, if need, add it
 }
 
 inline void BamConverter::writeCollapsedLines() {
 	bam1_t *tmp_b = NULL,*tmp_b2 = NULL;
 	float prb;
 	bool isPaired;
+	uint8_t *p;
 
 	if (!collapseMap.empty(isPaired)) {
 		while (collapseMap.next(tmp_b, tmp_b2, prb)) {
-			memcpy(bam_aux_get(tmp_b, "ZW") + 1, (uint8_t*)&(prb), bam_aux_type2size('f'));
-			tmp_b->core.qual = getMAPQ(prb);
+			p = bam_aux_get(tmp_b, "ZW");
+			if (p != NULL) {
+				memcpy(bam_aux_get(tmp_b, "ZW") + 1, (uint8_t*)&(prb), bam_aux_type2size('f'));
+				tmp_b->core.qual = getMAPQ(prb);
+			}
+			// otherwise, just use the MAPQ score of the orignal alignment
+
 			samwrite(out, tmp_b);
 			if (isPaired) {
-			  memcpy(bam_aux_get(tmp_b2, "ZW") + 1, (uint8_t*)&(prb), bam_aux_type2size('f'));
-			  tmp_b2->core.qual = tmp_b->core.qual;
-			  samwrite(out, tmp_b2);
+				if (p != NULL) memcpy(bam_aux_get(tmp_b2, "ZW") + 1, (uint8_t*)&(prb), bam_aux_type2size('f'));
+				tmp_b2->core.qual = tmp_b->core.qual;
+				samwrite(out, tmp_b2);
 			}
 			bam_destroy1(tmp_b);
 			if (isPaired) bam_destroy1(tmp_b2);
@@ -235,14 +271,58 @@ inline void BamConverter::flipQual(uint8_t* q, int readlen) {
 	}
 }
 
-inline void BamConverter::addXSTag(bam1_t* b, const Transcript& transcript) {
-	uint32_t* p = bam1_cigar(b);
+inline void BamConverter::modifyTags(bam1_t* b, const Transcript& transcript) {
+	char strand = transcript.getStrand();
+	uint8_t *s = NULL;
+
+	if (strand == '-') {
+	  s = bam_aux_get(b, "MD");
+	  if ((s != NULL) && (*(s) == 'Z') && (bam_aux2Z(s) != NULL)) {
+	    char *mis = bam_aux2Z(s);
+	    int len = strlen(mis);
+	    char *tmp = new char[len];
+	    int cur_type = -1, fr = -1, type, base;
+	    for (int i = 0; i < len; i++) {
+	      type = (mis[i] >= '0' && mis[i] <= '9');
+	      if (cur_type != type) {
+		switch(cur_type) {
+		case 0:
+		  base = len - 1;
+		  if (mis[fr] == '^') { tmp[len - i] = mis[fr]; ++fr; ++base; }
+		  for (int j = fr; j < i; j++) tmp[base - j] = ((mis[j] == 'A' || mis[j] == 'C' || mis[j] == 'G' || mis[j] == 'T') ? getOpp(mis[j]) : mis[j]);
+		  break;
+		case 1: 
+		  base = len - i - fr;
+		  for (int j = fr; j < i; j++) tmp[base + j] = mis[j]; 
+		  break; 
+		}
+		cur_type = type;
+		fr = i;
+	      }
+	    }
+	    switch(cur_type) {
+	    case 0:
+	      base = len - 1;
+	      if (mis[fr] == '^') { tmp[0] = mis[fr]; ++fr; ++base; }
+	      for (int j = fr; j < len; j++) tmp[base - j] = ((mis[j] == 'A' || mis[j] == 'C' || mis[j] == 'G' || mis[j] == 'T') ? getOpp(mis[j]) : mis[j]);
+	      break;
+	    case 1: 
+	      for (int j = fr; j < len; j++) tmp[j - fr] = mis[j]; 
+	      break; 
+	    }
+	    strncpy(mis, tmp, len);
+	    delete[] tmp;
+	  }
+	}
+
+	// append XS:A field if necessary
+	s = bam_aux_get(b, "XS");
+	if (s != NULL) bam_aux_del(b, s);
 	bool hasN = false;
+	uint32_t* p = bam1_cigar(b);
 	for (int i = 0; i < (int)b->core.n_cigar; i++)
 		if ((*(p + i) & BAM_CIGAR_MASK) == BAM_CREF_SKIP) { hasN = true; break; }
-	if (!hasN) return;
-	char strand = transcript.getStrand();
-	bam_aux_append(b, "XS", 'A', 1, (uint8_t*)&strand);
+	if (hasN) bam_aux_append(b, "XS", 'A', 1, (uint8_t*)&strand);
 }
 
 #endif /* BAMCONVERTER_H_ */