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lavd/v4l2: do not fail when VIDIOC_ENUMSTD returns EINVAL without a valid match

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With some (buggy) drivers, the VIDIOC_G_STD ioctl returns a std_id that cannot
be matched with any of the enumerated v4l2_standard structures (for example
std_id = 0 or std_id = 0xffffff). Do not fail when we reach the end of the
enumeration without a valid match.

Fixes ticket #2370

Note: This commit message has been modified by Giorgio Vazzana, the original
commit message was:

"Fixed regression for mandatory VIDIOC_ENUMSTD support by v4l2"

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
mrlika 2013-09-02 15:10:22 +03:00 committed by Michael Niedermayer
parent 2d28950da9
commit ed72542539
1 changed files with 4 additions and 0 deletions
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4
libavdevice/v4l2.c
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@ -687,6 +687,10 @@ static int v4l2_set_parameters(AVFormatContext *s1)
standard.index = i;
if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
ret = AVERROR(errno);
if (ret == AVERROR(EINVAL)) {
tpf = &streamparm.parm.capture.timeperframe;
break;
}
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
return ret;
}