[FFmpeg-devel] [PATCH] Windows support for av_file_map()

[Reimar Döffinger]

On 31 dec 2010, at 20:26, Daniel Verkamp <daniel at drv.nu> wrote:

> On Fri, Dec 31, 2010 at 8:51 AM, Reimar D?ffinger
> <Reimar.Doeffinger at gmx.de> wrote:
>> On Fri, Dec 31, 2010 at 02:35:50AM -0700, Daniel Verkamp wrote:
>>> This currently maps a read-only view of the file; this could be
>>> changed to R/W to match the mmap() path if desired, but any code
>>> expecting to actually use it for writing will fail with the non-mmap()
>>> path anyway since the file is never written back in that case.
>> 
>> What? Why would it not be written back?
> 
> In the malloc() case is what I meant - av_file_unmap() simply frees the buffer.

Even that could keep the file open and write the changes back before free - assuming the API was designed in a sane way that allows storing size and offset for use in that function.