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Unified interface for complex properties like pictures (#94)

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Provides a dynamic interface for properties which cannot be represented
with simple strings, e.g. pictures. The keys of such properties can
be queried using `complexPropertyKeys()`, which could return for example
["PICTURE"]. The property can then be read using
`complexProperties("PICTURE")`, which will return a list of variant maps
containing the picture data and attributes. Adding a picture is as
easy as

    t->setComplexProperties("PICTURE", {
      {
        {"data", data},
        {"pictureType", "Front Cover"},
        {"mimeType", "image/jpeg"}
      }
    });
This commit is contained in:
Urs Fleisch
2023-10-07 09:42:25 +02:00
parent 75d4252480
commit 6be03b7ae1
28 changed files with 1300 additions and 135 deletions
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33
examples/tagreader.cpp
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@ -27,6 +27,8 @@
#include <cstdio>
#include "tpropertymap.h"
#include "tstringlist.h"
#include "tvariant.h"
#include "fileref.h"
#include "tag.h"
@ -65,10 +67,39 @@ int main(int argc, char *argv[])
cout << "-- TAG (properties) --" << endl;
for(auto i = tags.cbegin(); i != tags.cend(); ++i) {
for(auto j = i->second.begin(); j != i->second.end(); ++j) {
cout << left << std::setw(longest) << i->first << " - " << '"' << *j << '"' << endl;
cout << left << std::setfill(' ') << std::setw(longest) << i->first << " - " << '"' << *j << '"' << endl;
}
}
TagLib::StringList names = f.file()->complexPropertyKeys();
for(const auto &name : names) {
const auto& properties = f.file()->complexProperties(name);
for(const auto &property : properties) {
cout << name << ":" << endl;
for(const auto &[key, value] : property) {
cout << " " << left << std::setfill(' ') << std::setw(11) << key << " - ";
if(value.type() == TagLib::Variant::ByteVector) {
cout << "(" << value.value<TagLib::ByteVector>().size() << " bytes)" << endl;
/* The picture could be extracted using:
ofstream picture;
TagLib::String fn(argv[i]);
int slashPos = fn.rfind('/');
int dotPos = fn.rfind('.');
if(slashPos >= 0 && dotPos > slashPos) {
fn = fn.substr(slashPos + 1, dotPos - slashPos - 1);
}
fn += ".jpg";
picture.open(fn.toCString(), ios_base::out | ios_base::binary);
picture << value.value<TagLib::ByteVector>();
picture.close();
*/
}
else {
cout << value << endl;
}
}
}
}
}
if(!f.isNull() && f.audioProperties()) {