Check if @length memory blocks in @buffer starting from @idx are writable.
@length can be -1 to check all the memory blocks after @idx.
Note that this function does not check if @buffer is writable, use gst_buffer_is_writable() to check that if needed.
an index
a length should not be 0
%TRUE if the memory range is writable
1.4
See Implementation
Check if @length memory blocks in @buffer starting from @idx are writable.
@length can be -1 to check all the memory blocks after @idx.
Note that this function does not check if @buffer is writable, use gst_buffer_is_writable() to check that if needed.