From 70f77361d8c339d516e3c4d1c4ab2bf9096d7cc6 Mon Sep 17 00:00:00 2001 From: José Miguel Gonçalves Date: Thu, 23 Sep 2010 09:16:05 +0000 Subject: Allow to set the frame rate in v4l2 devices Patch by José Miguel Gonçalves (jose DOT goncalves AT inov DOT pt) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Originally committed as revision 25159 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavdevice/v4l2.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'libavdevice') diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c index 6b85cf0594..035e41633d 100644 --- a/libavdevice/v4l2.c +++ b/libavdevice/v4l2.c @@ -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; } -- cgit v1.2.3