Some optimized functions reference optimized symbols, so the functions
must be explicitly disabled when those symbols are unavailable.

Some files may be missing for valid reasons, e.g. on compile failure.

Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Marton Balint <cus@passwd.hu>

Sample-Id: asan_heap-uaf_3660f67_757_cov_1257014655_Hi422FR1_SONY_A.jsv
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

First check the context, then check internal option. Drop the ! typo.
Introduced in 60f0fde3.

Should make the default behaviour safer for careless callers that open
random untrusted files.

Bug-Id: CVE-2016-1897
Bug-Id: CVE-2016-1898

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

It will be useful in the following commits.

Disallow other code to touch it directly, now it's only accessible
through a blacklisting/whitelisting function.

It needs to access the list of protocols directly, so it more properly
belongs there.

It's a more appropriate place for it.

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.

They are only written to, never read.

Now all IO should go through the IO callbacks and be interceptable by
the caller.

There is no real reason to treat them differently.

avio_close() can only be called on AVIOContexts created by avio_open(2).

It will in general not be available. Use block_align if known or fall
back to av_get_audio_frame_duration().

Reported-By: Maxim Koitsov <maksbotan@gentoo.org>

Some muxer might or might not fit incomplete mp3 frames in
their packets.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Some muxer might or might not fit incomplete mp3 frames in
their packets.

Bug-Id: 899

CC: libav-stable@libav.org
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

This reverts commits 2edc7187, a2bb771a, 21c750f2, 8e7bea6d.

The WTV demuxer depends on large parts of the MPEG-TS demuxer internals
anyway and fails to build without it.

Signed-off-by: Diego Biurrun <diego@biurrun.de>