Add a custom stream protocol. This will register a protocol handler under
the given protocol prefix, and invoke the given callbacks if an URI with the
matching protocol prefix is opened.
The "ro" is for read-only - only read-only streams can be registered with
this function.
The callback remains registered until the mpv core is registered.
If a custom stream with the same name is already registered, then the
MPV_ERROR_INVALID_PARAMETER error is returned.
@param protocol protocol prefix, for example "foo" for "foo://" URIs
@param user_data opaque pointer passed into the mpv_stream_cb_open_fn
callback.
@return error code
Add a custom stream protocol. This will register a protocol handler under the given protocol prefix, and invoke the given callbacks if an URI with the matching protocol prefix is opened.
The "ro" is for read-only - only read-only streams can be registered with this function.
The callback remains registered until the mpv core is registered.
If a custom stream with the same name is already registered, then the MPV_ERROR_INVALID_PARAMETER error is returned.
@param protocol protocol prefix, for example "foo" for "foo://" URIs @param user_data opaque pointer passed into the mpv_stream_cb_open_fn callback. @return error code