Help further refactoring.

Originally committed as revision 24814 to svn://svn.ffmpeg.org/ffmpeg/trunk

video4linux2 devices. This is used by Sensoray Model 2253 cards.
Patch by Pete Eberlein (pete AT sensoray DOT com)

Originally committed as revision 24759 to svn://svn.ffmpeg.org/ffmpeg/trunk

av_check_image_size() instead.

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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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function. Avoids the following warning:
libavdevice/v4l2.c: In function ‘v4l2_read_header’:
libavdevice/v4l2.c:586: warning: ‘codec_id’ may be used uninitialized in this function

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Move check on frame size after the device is opened and after
device_try_init() is attempted. If the provided size value is 0x0,
perform a VIDIOC_G_FMT ioctl() on the device, which sets size to the
current settings.

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Passing an explicit filename to this command is only necessary if the
documentation in the @file block refers to a file different from the
one the block resides in.

Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk

AVERROR(ENOMEM).

AVERROR_NOMEM is deprecated and will be dropped at the next libavutil
major bump.

Originally committed as revision 22791 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 22776 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Jean-Daniel Dupas, devlists shadowlab org

Originally committed as revision 22744 to svn://svn.ffmpeg.org/ffmpeg/trunk

is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk

AVERROR(-1) = 1.

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there is no need to check for it.

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It is indeed necessary to compile on NetBSD.

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Originally committed as revision 22575 to svn://svn.ffmpeg.org/ffmpeg/trunk

Save *s directly in SetWindowLongPtr instead.

Originally committed as revision 22574 to svn://svn.ffmpeg.org/ffmpeg/trunk

AVERROR_EIO for deletion at the next major bump.

Originally committed as revision 22513 to svn://svn.ffmpeg.org/ffmpeg/trunk

Mark bktr_init function as av_cold.
Tested to work by Michael Kostylev on the NetBSD FATE box.

Originally committed as revision 22487 to svn://svn.ffmpeg.org/ffmpeg/trunk

This make NetBSD compile out of the box at the cost of a hack, but a
locally contained one that is preferable to the one used in the wild.
Currently the NetBSD FATE box adds -D_NETBSD_SOURCE to CPPFLAGS to work
around broken system headers. Since it is unlikely for NetBSD to fix their
headers, it is better to use a standard flag instead of a system-specific one.

As a sideeffect, this allows getting rid of a local _NETBSD_SOURCE definition.

Originally committed as revision 22486 to svn://svn.ffmpeg.org/ffmpeg/trunk

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NetBSD is unlikely to fix their headers and the FATE box passes it
as -D_NETBSD_SOURCE on the command line anyway. In this case, it's
better to keep the hack well-contained within this file.
Closes issue 886.
patch by Jorge Acereda, jacereda brainstorm es

Originally committed as revision 22164 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Nash Tsai <nash dot tsai at gmail dot com>

Originally committed as revision 22004 to svn://svn.ffmpeg.org/ffmpeg/trunk

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from the former.
Patch by kemuri <kemuri9 at gmail dot com>

Originally committed as revision 21411 to svn://svn.ffmpeg.org/ffmpeg/trunk

Based on patch by Reinhard Tartler <siretart tauware de>

Originally committed as revision 21236 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Reinhard Tartler (siretart AT tauware DOT de).

Originally committed as revision 21004 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 20871 to svn://svn.ffmpeg.org/ffmpeg/trunk