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C bindings for complex properties like pictures (#953)

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Provides a unified API for complex properties in the same way as
the Properties API in the C bindings. Since constructing and
traversing complex properties in C is a bit complicated, there
are convenience functions for the most common use case of getting
or setting a single picture.

    TAGLIB_COMPLEX_PROPERTY_PICTURE(props, data, size, "Written by TagLib",
                                   "image/jpeg", "Front Cover");
    taglib_complex_property_set(file, "PICTURE", props);

and

    TagLib_Complex_Property_Attribute*** properties =
      taglib_complex_property_get(file, "PICTURE");
    TagLib_Complex_Property_Picture_Data picture;
    taglib_picture_from_complex_property(properties, &picture);
This commit is contained in:
Urs Fleisch
2023-10-15 19:38:15 +02:00
parent 1d213b8b98
commit a3ad2d0aaa
3 changed files with 619 additions and 2 deletions
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69
examples/tagreader_c.c
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@ -40,6 +40,7 @@ int main(int argc, char *argv[])
TagLib_Tag *tag;
const TagLib_AudioProperties *properties;
char **propertiesMap;
char **complexKeys;
taglib_set_strings_unicode(1);
@ -54,6 +55,7 @@ int main(int argc, char *argv[])
tag = taglib_file_tag(file);
properties = taglib_file_audioproperties(file);
propertiesMap = taglib_property_keys(file);
complexKeys = taglib_complex_property_keys(file);
if(tag != NULL) {
printf("-- TAG (basic) --\n");
@ -91,6 +93,73 @@ int main(int argc, char *argv[])
}
}
if(complexKeys != NULL) {
char **keyPtr = complexKeys;
while(*keyPtr) {
TagLib_Complex_Property_Attribute*** properties =
taglib_complex_property_get(file, *keyPtr);
printf("%s:\n", *keyPtr);
if(properties != NULL) {
TagLib_Complex_Property_Attribute*** propPtr = properties;
while(*propPtr) {
TagLib_Complex_Property_Attribute** attrPtr = *propPtr;
while(*attrPtr) {
TagLib_Complex_Property_Attribute *attr = *attrPtr;
TagLib_Variant_Type type = attr->value.type;
printf(" %-11s - ", attr->key);
switch(type) {
case TagLib_Variant_Void:
printf("null\n");
break;
case TagLib_Variant_Bool:
printf("%s\n", attr->value.value.boolValue ? "true" : "false");
break;
case TagLib_Variant_Int:
printf("%d\n", attr->value.value.intValue);
break;
case TagLib_Variant_UInt:
printf("%u\n", attr->value.value.uIntValue);
break;
case TagLib_Variant_LongLong:
printf("%lld\n", attr->value.value.longLongValue);
break;
case TagLib_Variant_ULongLong:
printf("%llu\n", attr->value.value.uLongLongValue);
break;
case TagLib_Variant_Double:
printf("%f\n", attr->value.value.doubleValue);
break;
case TagLib_Variant_String:
printf("%s\n", attr->value.value.stringValue);
break;
case TagLib_Variant_StringList:
if(attr->value.value.stringListValue) {
char **strs = attr->value.value.stringListValue;
char **s = strs;
while(*s) {
if(s != strs) {
printf(" ");
}
printf("%s", *s++);
}
}
printf("\n");
break;
case TagLib_Variant_ByteVector:
printf("(%u bytes)\n", attr->value.size);
break;
}
++attrPtr;
}
++propPtr;
}
taglib_complex_property_free(properties);
}
++keyPtr;
}
taglib_complex_property_free_keys(complexKeys);
}
if(properties != NULL) {
seconds = taglib_audioproperties_length(properties) % 60;
minutes = (taglib_audioproperties_length(properties) - seconds) / 60;