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v4l2object: Don't share own pool if min exceed V4L2 capacity

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If the minimum required buffer exceed V4L2 capacity, don't share down
pool. This allow support very high latency, like with x264enc default
encoding settings.

https://bugzilla.gnome.org/show_bug.cgi?id=732288
This commit is contained in:
Nicolas Dufresne 2014-07-08 14:31:59 -04:00 committed by Nicolas Dufresne
parent 010272a796
commit 3df949c745
1 changed files with 14 additions and 10 deletions
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24
sys/v4l2/gstv4l2object.c
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@ -3183,6 +3183,20 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
can_share_own_pool = (has_video_meta || !obj->need_video_meta);
/* Certain driver may expose a minimum through controls */
ctl.id = V4L2_CID_MIN_BUFFERS_FOR_CAPTURE;
if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CTRL, &ctl) >= 0) {
GST_DEBUG_OBJECT (obj->element, "driver require a minimum of %d buffers",
ctl.value);
obj->min_buffers_for_capture = ctl.value;
} else {
obj->min_buffers_for_capture = 0;
}
/* We can't share our own pool, if it exceed V4L2 capacity */
if (min + obj->min_buffers_for_capture + 1 > VIDEO_MAX_FRAME)
can_share_own_pool = FALSE;
/* select a pool */
switch (obj->mode) {
case GST_V4L2_IO_RW:
@ -3250,16 +3264,6 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
if (size == 0)
goto no_size;
/* Certain driver may expose a minimum through controls */
ctl.id = V4L2_CID_MIN_BUFFERS_FOR_CAPTURE;
if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CTRL, &ctl) >= 0) {
GST_DEBUG_OBJECT (obj->element, "driver require a minimum of %d buffers",
ctl.value);
obj->min_buffers_for_capture = ctl.value;
} else {
obj->min_buffers_for_capture = 0;
}
/* If pushing from our own pool, configure it with queried minimum,
* otherwise use the minimum required */
if (pushing_from_our_pool) {