Arch specific calls should have an emms_c following to keep the cpu
state consistent.

Reported-By: wm4
CC: libav-stable@libav.org

The s390 architecture requires shared libraries to be built in PIC mode.
Otherwise applications will get wrong relocations at run-time, leading
to confusing segmentation faults.

CC: libav-stable@libav.org

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

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

Error introduced in 61b323ce.

This requires adding includes to other files that relied on these being
included implicitly.

This helps in disentangling lavf and lavc too.

strtok_r is not needed any more, so remove it from configure.

Avoid a division by 0 in ff_mpeg4_set_one_direct_mv.

Sample-Id: 00000168-google
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Signed-off-by: Martin Storsjö <martin@martin.st>

Without this cast, the BE_32() expression is sign extended when
assigned to an uint64_t, since the uint8_t|uint8_t expression
is promoted to an int.

Also avoid undefined behaviour when left shifting an uint8_t
by 24 by casting it to an uint32_t explicitly before shifting.

Based on a patch by Michael Niedermayer.
Signed-off-by: Martin Storsjö <martin@martin.st>

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>

This silences a warning in the coverity static analyzer.
Signed-off-by: Martin Storsjö <martin@martin.st>

These variables are assigned the return values of ftello, which
returns an off_t, which is a signed type. On errors, ftello returns
-1, thus make sure this error return value can be stored properly.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

qt-faststart doesn't use the normal libav headers at all since
it's supposed to be a completely standalone tool, so we implement
the macro locally in this file.
Signed-off-by: Martin Storsjö <martin@martin.st>

Copying data in chunks of 1 KB is a little wasteful.

64 KB should still easily fit on the stack, so there's no need
to allocate it dynamically.
Signed-off-by: Martin Storsjö <martin@martin.st>

avcodec_flush_buffers() must release all internally held references
according to its documentation, for which all the threads need to be
flushed.

CC:libav-stable@libav.org
Bug-Id: vlc/9665

A threading type might be detected originally, but later disabled
if one of its dependencies is unavailable.

This makes sure that the threading support item in the configure
output is right for setups where w32threads are available but
native atomics aren't.
Signed-off-by: Martin Storsjö <martin@martin.st>

Almost all of the code is shared so there is little point in
enabling one decoder/encoder without the other.

Almost all of the code is shared so there is little point in
enabling one decoder without the other.

These codecs compile all of the MJPEG code anyway, so there is little
point in not enabling the MJPEG decoder directly. This also simplifies
the dependency declarations for the MJPEG codec family.

This codec compiles all of the SP5X code anyway, so there is little
point in not enabling the decoder directly. This also simplifies the
dependency declaration for the AMV decoder.

This is the name used in the specifications.

Also comment all previous profiles.

AAC LOAS can have new audio config objects in the stream itself.

Make sure the decoder reconfigures itself when the first one arrives
midstream.

Bug-Id: 644
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

The vector dequantization has a test in a loop preventing effective SIMD
implementation. By moving it out of the loop, this loop can be DSPized.

Therefore, modify the current DSP implementation. In particular, the
DSP implementation no longer has to handle null loop sizes.

The decode_hf implementations have following timings:

For x86 Arrandale:
        C  SSE SSE2 SSE4
win32: 260 162  119  104
win64: 242 N/A   89   72

The arm NEON optimizations follow in a later patch as external asm. The
now unused check for the y modifier in arm inline asm is removed from
configure.

Based on a patch from Christophe Gisquet.

Unrolling of the m == 0 case avoids a possible use of the uninitilized
value sum when s->predictor_history is not set. I failed to find a
sample for it. It also reduced the cycle count from 220 to 150 on
sandy bridge, x86_64 linux, gcc 4.8.2 compared to his patch.

Timings for Arrandale:
          C    SSE
win32:  2108   334
win64:  1152   322

Factorizing the inner loop with a call/jmp is a >15 cycles cost, even with
the jmp destination being aligned.

Unrolling for ARCH_X86_64 is a 20 cycles gain.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>

This change is inspired by x86 asm where it frees a register.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>

Results for Arrandale/Windows:
32: 1670 -> 316
64:  728 -> 298
Signed-off-by: Janne Grunau <janne-libav@jannau.net>

The scaling factor is constant so it is faster to scale the
FIR coefficients in the tables during compilation.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>