Since all URLContexts have the same AVOptions, such AVOptions
will be applied on the outermost context only and removed from the
dict, while they probably make sense on all contexts.

This makes sure that rw_timeout gets propagated to the innermost
URLContext (to make sure it gets passed to the tcp protocol, when
opening a http connection for instance).

Alternatively, such matching options would be kept in the dict
and only removed after the ffurl_connect call.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

This way, the decisions about which protocols are available for use in
any given situations can be delegated to the caller.

Instead of a linked list constructed at av_register_all(), store them
in a constant array of pointers.

Since no registration is necessary now, this removes some global state
from lavf. This will also allow the urlprotocol layer caller to limit
the available protocols in a simple and flexible way in the following
commits.

Reviewed-by: Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This avoids having to overestimate the md5 context size, which
isn't known beforehand, allowing us to use the new allocate functions
instead.
Signed-off-by: Martin Storsjö <martin@martin.st>

The private data pointer isn't a file handle, this protocol
doesn't have any file handle to return.
Signed-off-by: Martin Storsjö <martin@martin.st>

Not used anywhere yet, support for passing options from avio_open() will
follow.

Change all uses of these function to pass the relevant
callback on.

Make AVIO_FLAG_ access constants work as flags, and in particular fix
the behavior of functions (such as avio_check()) which expect them to
be flags rather than modes.

This breaks API.

Signed-off-by: Mans Rullgard <mans@mansr.com>

This also lists the objects from those two libraries as internal (by adding
the ff_ prefix) so that they can then be hidden via linker scripts.
(cherry picked from commit c6610a21)

This also lists the objects from those two libraries as internal (by adding
the ff_ prefix) so that they can then be hidden via linker scripts.

This is a write-only protocol which computes the md5sum of data written,
and on close writes this to the designated output or stdout if none
is specified.  It can be used to test muxers without writing an actual
file.

Originally committed as revision 24309 to svn://svn.ffmpeg.org/ffmpeg/trunk