map_range

Fills info with the MapInfo of length merged memory blocks starting at idx in this.

When length is -1, all memory blocks starting from idx are merged and mapped.

flags describe the desired access of the memory. When flags is WRITE, this should be writable (as returned from gst_buffer_is_writable).

When this is writable but the memory isn't, a writable copy will automatically be created and returned. The readonly copy of the buffer memory will then also be replaced with this writable copy.

The memory in info should be unmapped with unmap after usage.

Parameters:

this	a Buffer.
idx	an index
length	a length
info	info about the mapping
flags	flags for the mapping

Returns:

true if the map succeeded and info contains valid data.