map_range
Description:
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:
|
|