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v4l2src: device sequence/offset correction in case of renegotiation

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The v4l2 device restarts the sequence counter in case of streamoff/streamon,
the GST offset values are supposed to increment strictly monotonic, so
adjust the sequence counter/offset values in case of caps
renegotiation.

https://bugzilla.gnome.org/show_bug.cgi?id=745441
This commit is contained in:
Peter Seiderer 2015-03-27 21:09:44 +01:00 committed by Nicolas Dufresne
parent 866d97fa2c
commit f160625ea6
2 changed files with 11 additions and 2 deletions
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10
sys/v4l2/gstv4l2src.c
View file

@ -459,9 +459,10 @@ gst_v4l2src_set_caps (GstBaseSrc * src, GstCaps * caps)
* Basesrc will do an allocation query that
* should indirectly reclaim buffers, after that we can
* set the format and then configure our pool */
if (gst_v4l2_object_try_format (obj, caps))
if (gst_v4l2_object_try_format (obj, caps)) {
v4l2src->renegotiation_adjust = v4l2src->offset + 1;
v4l2src->pending_set_fmt = TRUE;
else
} else
return FALSE;
} else {
/* make sure we stop capturing and dealloc buffers */
@ -588,6 +589,7 @@ gst_v4l2src_start (GstBaseSrc * src)
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
v4l2src->offset = 0;
v4l2src->renegotiation_adjust = 0;
/* activate settings for first frame */
v4l2src->ctrl_time = 0;
@ -813,6 +815,10 @@ retry:
GST_BUFFER_OFFSET (*buf) = v4l2src->offset++;
GST_BUFFER_OFFSET_END (*buf) = v4l2src->offset;
} else {
/* adjust raw v4l2 device sequence, will restart at null in case of renegotiation
* (streamoff/streamon) */
GST_BUFFER_OFFSET (*buf) += v4l2src->renegotiation_adjust;
GST_BUFFER_OFFSET_END (*buf) += v4l2src->renegotiation_adjust;
/* check for frame loss with given (from v4l2 device) buffer offset */
if ((v4l2src->offset != 0) && (GST_BUFFER_OFFSET (*buf) != (v4l2src->offset + 1))) {
guint64 lost_frame_count = GST_BUFFER_OFFSET (*buf) - v4l2src->offset - 1;

3
sys/v4l2/gstv4l2src.h
View file

@ -59,6 +59,9 @@ struct _GstV4l2Src
guint64 offset;
/* offset adjust after renegotiation */
guint64 renegotiation_adjust;
GstClockTime ctrl_time;
gboolean pending_set_fmt;