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Code Issues Releases Activity

Allow to set the frame rate in v4l2 devices

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Patch by José Miguel Gonçalves (jose DOT goncalves AT inov DOT pt)

Originally committed as revision 25159 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
José Miguel Gonçalves 2010-09-23 09:16:05 +00:00 committed by Luca Abeni
parent 6ac6e3d123
commit 70f77361d8
1 changed files with 27 additions and 0 deletions
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27
libavdevice/v4l2.c
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@ -489,6 +489,33 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap)
}
}
if (ap->time_base.num && ap->time_base.den) {
struct v4l2_streamparm streamparm = { 0 };
struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
ap->time_base.num, ap->time_base.den);
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
tpf->numerator = ap->time_base.num;
tpf->denominator = ap->time_base.den;
if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
av_log(s1, AV_LOG_ERROR,
"ioctl set time per frame(%d/%d) failed\n",
ap->time_base.num, ap->time_base.den);
return AVERROR(EIO);
}
if (ap->time_base.den != tpf->denominator ||
ap->time_base.num != tpf->numerator) {
av_log(s1, AV_LOG_INFO,
"The driver changed the time per frame from %d/%d to %d/%d\n",
ap->time_base.num, ap->time_base.den,
tpf->numerator, tpf->denominator);
ap->time_base.num = tpf->numerator;
ap->time_base.den = tpf->denominator;
}
}
return 0;
}