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Simple ID3v2.4 => ID3v2.3 frame migration

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This commit is contained in:
Lukáš Lalinský
2011-03-16 17:14:36 +01:00
parent 061b381ea8
commit e8d0551c9a
3 changed files with 112 additions and 1 deletions
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68
taglib/mpeg/id3v2/id3v2tag.cpp
View File

@ -334,6 +334,61 @@ ByteVector ID3v2::Tag::render() const
return render(4);
}
void ID3v2::Tag::downgradeFrames(FrameList *frames, FrameList *newFrames) const
{
const char *unsupportedFrames[] = {
"ASPI", "EQU2", "RVA2", "SEEK", "SIGN", "TDRL", "TDTG",
"TMOO", "TPRO", "TSOA", "TSOT", "TSST", "TSOP", "TIPL",
"TMCL", 0
};
ID3v2::TextIdentificationFrame *frameTDOR = 0;
ID3v2::TextIdentificationFrame *frameTDRC = 0;
for(FrameList::Iterator it = d->frameList.begin(); it != d->frameList.end(); it++) {
ID3v2::Frame *frame = *it;
ByteVector frameID = frame->header()->frameID();
for(int i = 0; unsupportedFrames[i]; i++) {
if(frameID == unsupportedFrames[i]) {
debug("A frame that is not supported in ID3v2.3 \'"
+ String(frameID) + "\' has been discarded");
frame = 0;
break;
}
}
if(frame && frameID == "TDOR") {
frameTDOR = dynamic_cast<ID3v2::TextIdentificationFrame *>(frame);
frame = 0;
}
if(frame && frameID == "TDRC") {
frameTDRC = dynamic_cast<ID3v2::TextIdentificationFrame *>(frame);
frame = 0;
}
if(frame) {
frames->append(frame);
}
}
if(frameTDOR) {
String content = frameTDOR->toString();
if(content.size() >= 4) {
ID3v2::TextIdentificationFrame *frameTORY = new ID3v2::TextIdentificationFrame("TORY", String::Latin1);
frameTORY->setText(content.substr(0, 4));
frames->append(frameTORY);
newFrames->append(frameTORY);
}
}
if(frameTDRC) {
// FIXME we can do better here, define also TDAT and TIME
String content = frameTDRC->toString();
if(content.size() >= 4) {
ID3v2::TextIdentificationFrame *frameTYER = new ID3v2::TextIdentificationFrame("TYER", String::Latin1);
frameTYER->setText(content.substr(0, 4));
frames->append(frameTYER);
newFrames->append(frameTYER);
}
}
// FIXME migrate TIPL and TMCL to IPLS
}
ByteVector ID3v2::Tag::render(int version) const
{
// We need to render the "tag data" first so that we have to correct size to
@ -347,7 +402,18 @@ ByteVector ID3v2::Tag::render(int version) const
// Loop through the frames rendering them and adding them to the tagData.
for(FrameList::Iterator it = d->frameList.begin(); it != d->frameList.end(); it++) {
FrameList newFrames;
newFrames.setAutoDelete(true);
FrameList frameList;
if(version == 4) {
frameList = d->frameList;
}
else {
downgradeFrames(&frameList, &newFrames);
}
for(FrameList::Iterator it = frameList.begin(); it != frameList.end(); it++) {
(*it)->header()->setVersion(version);
if((*it)->header()->frameID().size() != 4) {
debug("A frame of unsupported or unknown type \'"

2
taglib/mpeg/id3v2/id3v2tag.h
View File

@ -295,6 +295,8 @@ namespace TagLib {
*/
void setTextFrame(const ByteVector &id, const String &value);
void downgradeFrames(FrameList *existingFrames, FrameList *newFrames) const;
private:
Tag(const Tag &);
Tag &operator=(const Tag &);