Fixes --disable-everything --enable-decoder=h264 --disable-optimizations.

The mpeg4 video, H264 and VC-1 parser hold (directly or indirectly)
a MpegEncContext in their private context. Since they do not call the
common mpegvideo init function slice_context_count has explicitly set
to 1.
Prevents a null pointer dereference in the h264 parser and fixes
bug 193.

Align IEC 61937 length_code for DTS-HD so that
(length_code & 0xf) == 0x8. This is reportedly needed with some
receivers.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

Prevents a division by zero.

Prevents null ptr derefence for negative sizes.

The implicit network initialization is set to be removed in the
future, but is kept for compatibility. By not doing the implicit
initialization for non-network protocols, we avoid the warning
about avformat_network_init() not being called for these, where
it really doesn't make much sense.
Signed-off-by: Martin Storsjö <martin@martin.st>

This definition is in two files, since the definitions will move
to the private header at the next bump.
Signed-off-by: Martin Storsjö <martin@martin.st>

matroskadec: Fix a bug where a pointer was cached to an array that might later move due to a realloc()

Fixes bug #190
Chromium bug #100492
related to CVE-2011-3893
Signed-off-by: Reinhard Tartler <siretart@tauware.de>

4xm decoder while decoding i2 frames can overread the buffer if proper checks
are not made.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

Check explicitly if enough bits are left to prevent an infinite loop
when the bitstream buffer is not followed by zero-padding.

Based on patches by Michael Niedermayer <michaelni@gmx.at>.

Fixes a regression introduced in 8b94df0f.

Also document the function somewhat.

This fixes an infinite loop in the decoder on specially
crafted files, and fixes bug 151.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

This reverts commit 295a7c02. The
patch breaks decoding of regular files (e.g. fate-4xm-2).

4xm decoder while decoding i2 frames can overread the buffer if proper checks
are not made.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

frame_size is the number of bytes left in the packet, so if we are passing
buf-4 we can safely read frame_size+4 bytes.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

The current code doesn't work unless width is an exact multiple of 16.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

audio_subsegments would be 0 and cause floating point exceptions
Fixes bugzilla #144
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

V4L2_FMT_FLAG_EMULATED was added in 2.6.32.

These can't be used uninitialized in practice, but the
compiler doesn't realize it.
Signed-off-by: Martin Storsjö <martin@martin.st>

This one won't ever be used uninitialized in practice, but
the compiler doesn't realize it.
Signed-off-by: Martin Storsjö <martin@martin.st>

This fixes compilation failures related to START_TIMER/STOP_TIMER macros and
-Werror=declaration-after-statement.  START_TIMER declares variables and thus
may not be placed after statements outside of a new block.

Make use of the experimental framesize enumeration ioctl if available.

Unbreak direct streamcopy.

Check capabilities directly in the function, further simplify the code.

Only mmap is supported.

Video4linux2 supports both interlaced and non-interlaced mode, do not
ask for interlaced if not necessary.