diff options
Diffstat (limited to 'libavdevice/v4l2.c')
| -rw-r--r-- | libavdevice/v4l2.c | 27 |
1 files changed, 27 insertions, 0 deletions
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; } |