not defined.

This allows applications to check if av_strerror() cannot provide a
meaningful representation for the provided error code, without having
to actually check the filled string.

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Patch by Sebastian Vater, cdgs D basty A googlemail


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Patch by Sebastian Vater, cdgs D basty A googlemail


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Patch by Thierry Foucu, tfoucu gmail 


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number if strerror_r() did not succeed for whatever reason.

This avoids the need for the application to fill the string in case
strerror_r() fails, for example because the error code is not known.

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ICC needs at least -O1 to link so add this when optimisations are
otherwise disabled.

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The output scaling was accidentally removed in rev 22937.


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avcodec_decode_video3.


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Feel free to revert if you can specify a concrete case where this actually
is necessary.


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Partially fixes issue 1758.



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av_probe_input_format2


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of failure return the stored value rather than the current errno,
which may be overwritten by a following call to close().

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Thanks to Chromium.


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Thanks to Chromium.


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6 patches means there can be 7 borders. Found by Chromium.


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Fixes issue1901


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This includes merging ff_sbr_dequant into ff_sbr_apply.

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Approved by the previous maintainer Rob.

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Using macro templates allows the vp[56]_adjust functions to be
inlined instead of called through function pointers.  The new
function pointers enable optimised implementations of the filters.

4% faster VP6 decoding on Cortex-A8.

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The normal byteswap functions might use inline asm which is suboptimal
with constants (and cannot be used in static initialisers), so special
macros for constants only is needed.

We should not rely on the gcc __builtin_constant_p() test since it is
not always available.

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