mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-26 19:51:11 +00:00
Code Issues 1 Projects Releases Wiki Activity

v4l2src: Calculate framerate from DV timings

Browse source 
And use this framerate in our preference. Note that we also flush
the probed caps as it seems that the format enumeration may change
when a new source change event get triggered.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/870>
This commit is contained in:
Nicolas Dufresne 2021-02-10 16:37:01 -05:00
parent 25696203c3
commit b530c0ef4e
2 changed files with 25 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
sys/v4l2/gstv4l2src.c
View file

@ -493,19 +493,39 @@ gst_v4l2src_query_preferred_dv_timings (GstV4l2Src * v4l2src,
{
GstV4l2Object *obj = v4l2src->v4l2object;
struct v4l2_dv_timings dv_timings = { 0, };
const struct v4l2_bt_timings *bt = &dv_timings.bt;
gint tot_width, tot_height;
gint gcd;
if (!gst_v4l2_query_dv_timings (obj, &dv_timings))
return FALSE;
pref->width = dv_timings.bt.width;
pref->height = dv_timings.bt.height;
/* FIXME calculate frame rate */
pref->width = bt->width;
pref->height = bt->height;
tot_height = bt->height +
bt->vfrontporch + bt->vsync + bt->vbackporch +
bt->il_vfrontporch + bt->il_vsync + bt->il_vbackporch;
tot_width = bt->width + bt->hfrontporch + bt->hsync + bt->hbackporch;
pref->fps_n = bt->pixelclock;
pref->fps_d = tot_width * tot_height;
if (bt->interlaced)
pref->fps_d /= 2;
gcd = gst_util_greatest_common_divisor (pref->fps_n, pref->fps_d);
pref->fps_n /= gcd;
pref->fps_d /= gcd;
/* If are are not streaming (e.g. we received source-change event), lock the
* new timing immediatly so that TRY_FMT can properly work */
if (!obj->pool || !GST_V4L2_BUFFER_POOL_IS_STREAMING (obj->pool))
gst_v4l2_set_dv_timings (obj, &dv_timings);
GST_INFO_OBJECT (v4l2src, "Using DV Timings: %i x %i (%i/%i fps)",
pref->width, pref->height, pref->fps_n, pref->fps_d);
return TRUE;
}
@ -922,6 +942,7 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
* streamoff in order to allow locking a new DV_TIMING which will
* influence the output of TRY_FMT */
gst_v4l2src_stop (GST_BASE_SRC (src));
gst_caps_replace (&obj->probed_caps, NULL);
/* Force renegotiation */
v4l2src->renegotiation_adjust = v4l2src->offset + 1;

2
sys/v4l2/v4l2_calls.c
View file

@ -1352,7 +1352,7 @@ gst_v4l2_query_dv_timings (GstV4l2Object * v4l2object,
return FALSE;
}
GST_INFO_OBJECT (v4l2object->dbg_obj, "Detected DV Timings (%i x %i)",
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Detected DV Timings (%i x %i)",
timings->bt.width, timings->bt.height);
return TRUE;