Skip duplicate ID3v2 tags in MPEG files.

diff --git a/taglib/mpeg/mpegfile.cpp b/taglib/mpeg/mpegfile.cpp
index f765befb03a7540853d034273285a29556c5836c..e64e83034c6e3d0dccec18006927ab6834835bba 100644 (file)
--- a/taglib/mpeg/mpegfile.cpp
+++ b/taglib/mpeg/mpegfile.cpp
@@ -433,9 +433,20 @@ long MPEG::File::firstFrameOffset()
 {
   long position = 0;
 
-  if(ID3v2Tag())
+  if(ID3v2Tag()) {
+    // Skip duplicate ID3v2 tags.
+
     position = d->ID3v2Location + ID3v2Tag()->header()->completeTagSize();
 
+    long location;
+    while((location = findID3v2(position)) >= 0) {
+      ID3v2::Tag dupTag(this, location);
+      position = location + dupTag.header()->completeTagSize();
+
+      debug("MPEG::File::firstFrameOffset() - Duplicate ID3v2 tag found.");
+    }
+  }
+
   return nextFrameOffset(position);
 }
 
@@ -467,7 +478,7 @@ void MPEG::File::read(bool readProperties, Properties::ReadStyle propertiesStyle
 {
   // Look for an ID3v2 tag
 
-  d->ID3v2Location = findID3v2();
+  d->ID3v2Location = findID3v2(0);
 
   if(d->ID3v2Location >= 0) {
 
@@ -510,7 +521,7 @@ void MPEG::File::read(bool readProperties, Properties::ReadStyle propertiesStyle
   ID3v1Tag(true);
 }
 
-long MPEG::File::findID3v2()
+long MPEG::File::findID3v2(long offset)
 {
   // This method is based on the contents of TagLib::File::find(), but because
   // of some subtlteies -- specifically the need to look for the bit pattern of
@@ -534,9 +545,9 @@ long MPEG::File::findID3v2()
 
     long originalPosition = tell();
 
-    // Start the search at the beginning of the file.
+    // Start the search at the offset.
 
-    seek(0);
+    seek(offset);
 
     // This loop is the crux of the find method.  There are three cases that we
     // want to account for:
@@ -547,7 +558,7 @@ long MPEG::File::findID3v2()
     // (2) The search pattern is wholly contained within the current buffer.
     //
     // (3) The current buffer ends with a partial match of the pattern.  We will
-    // note this for use in the next itteration, where we will check for the rest
+    // note this for use in the next iteration, where we will check for the rest
     // of the pattern.
 
     for(buffer = readBlock(bufferSize()); buffer.size() > 0; buffer = readBlock(bufferSize())) {
@@ -561,7 +572,7 @@ long MPEG::File::findID3v2()
         const int patternOffset = (bufferSize() - previousPartialMatch);
         if(buffer.containsAt(ID3v2::Header::fileIdentifier(), 0, patternOffset)) {
           seek(originalPosition);
-          return bufferOffset - bufferSize() + previousPartialMatch;
+          return offset + bufferOffset - bufferSize() + previousPartialMatch;
         }
       }
 
@@ -570,7 +581,7 @@ long MPEG::File::findID3v2()
       long location = buffer.find(ID3v2::Header::fileIdentifier());
       if(location >= 0) {
         seek(originalPosition);
-        return bufferOffset + location;
+        return offset + bufferOffset + location;
       }
 
       int firstSynchByte = buffer.find(char(uchar(255)));

diff --git a/taglib/mpeg/mpegfile.h b/taglib/mpeg/mpegfile.h
index 3fc01e680da2e030a27b27dfa41c3d0a1b44ad76..a03887a3e6c6b0099010b20d03e8ae4242fd7432 100644 (file)
--- a/taglib/mpeg/mpegfile.h
+++ b/taglib/mpeg/mpegfile.h
@@ -242,8 +242,8 @@ namespace TagLib {
        * if there is no valid ID3v2 tag.  If \a create is true it will create
        * an ID3v2 tag if one does not exist and returns a valid pointer.
        *
-       * \note This may return a valid pointer regardless of whether or not the 
-       * file on disk has an ID3v2 tag.  Use hasID3v2Tag() to check if the file 
+       * \note This may return a valid pointer regardless of whether or not the
+       * file on disk has an ID3v2 tag.  Use hasID3v2Tag() to check if the file
        * on disk actually has an ID3v2 tag.
        *
        * \note The Tag <b>is still</b> owned by the MPEG::File and should not be
@@ -261,8 +261,8 @@ namespace TagLib {
        * if there is no valid ID3v1 tag.  If \a create is true it will create
        * an ID3v1 tag if one does not exist and returns a valid pointer.
        *
-       * \note This may return a valid pointer regardless of whether or not the 
-       * file on disk has an ID3v1 tag.  Use hasID3v1Tag() to check if the file 
+       * \note This may return a valid pointer regardless of whether or not the
+       * file on disk has an ID3v1 tag.  Use hasID3v1Tag() to check if the file
        * on disk actually has an ID3v1 tag.
        *
        * \note The Tag <b>is still</b> owned by the MPEG::File and should not be
@@ -280,8 +280,8 @@ namespace TagLib {
        * if there is no valid APE tag.  If \a create is true it will create
        * an APE tag if one does not exist and returns a valid pointer.
        *
-       * \note This may return a valid pointer regardless of whether or not the 
-       * file on disk has an APE tag.  Use hasAPETag() to check if the file 
+       * \note This may return a valid pointer regardless of whether or not the
+       * file on disk has an APE tag.  Use hasAPETag() to check if the file
        * on disk actually has an APE tag.
        *
        * \note The Tag <b>is still</b> owned by the MPEG::File and should not be
@@ -370,7 +370,7 @@ namespace TagLib {
       File &operator=(const File &);
 
       void read(bool readProperties, Properties::ReadStyle propertiesStyle);
-      long findID3v2();
+      long findID3v2(long offset);
       long findID3v1();
       void findAPE();