Checks 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
Checks 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.