Calls the provided function once for each field in the Structure.
Use gst_structure_map_in_place_id_str.
In contrast to @foreach, the function may modify but not delete the fields. The structure must be mutable.
| this | |
| func |
a function to call for each field |
| user_data |
private data |
|
true if the supplied function returns true For each of the fields, false otherwise. |