Commit 70f77361 authored by José Miguel Gonçalves's avatar José Miguel Gonçalves Committed by Luca Abeni
Browse files

Allow to set the frame rate in v4l2 devices

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

Originally committed as revision 25159 to svn://
parent 6ac6e3d1
......@@ -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;
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