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v4l2: set min_latency for output device according to required minimum number of buffers

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Since we can get the minimum number of buffers needed by an output
device to work, use it to set min_latency which will determine how many
buffers are queued.

https://bugzilla.gnome.org/show_bug.cgi?id=736072
This commit is contained in:
Aurélien Zanelli 2014-09-04 18:35:46 +02:00 committed by Nicolas Dufresne
parent d9a7954dc9
commit 3afec4dd01
3 changed files with 12 additions and 4 deletions
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6
sys/v4l2/gstv4l2bufferpool.c
View file

@ -623,8 +623,10 @@ gst_v4l2_buffer_pool_start (GstBufferPool * bpool)
&max_buffers))
goto wrong_config;
/* TODO Also consider min_buffers_for_output when implemented */
min_latency = MAX (GST_V4L2_MIN_BUFFERS, obj->min_buffers_for_capture);
if (V4L2_TYPE_IS_OUTPUT (obj->type))
min_latency = MAX (GST_V4L2_MIN_BUFFERS, obj->min_buffers_for_output);
else
min_latency = MAX (GST_V4L2_MIN_BUFFERS, obj->min_buffers_for_capture);
switch (obj->mode) {
case GST_V4L2_IO_RW:

7
sys/v4l2/gstv4l2object.c
View file

@ -3472,10 +3472,13 @@ gst_v4l2_object_propose_allocation (GstV4l2Object * obj, GstQuery * query)
if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CTRL, &ctl) >= 0) {
GST_DEBUG_OBJECT (obj->element, "driver require a miminum of %d buffers",
ctl.value);
min = MAX (ctl.value, GST_V4L2_MIN_BUFFERS);
obj->min_buffers_for_output = ctl.value;
} else {
obj->min_buffers_for_output = 0;
}
min = MAX (obj->min_buffers_for_output, GST_V4L2_MIN_BUFFERS);
gst_query_add_allocation_pool (query, pool, size, min, max);
/* we also support various metadata */

3
sys/v4l2/gstv4l2object.h
View file

@ -121,6 +121,9 @@ struct _GstV4l2Object {
* calculate the minimum latency of a m2m decoder. */
guint32 min_buffers_for_capture;
/* This will be set if supported in propose allocation. */
guint32 min_buffers_for_output;
/* wanted mode */
GstV4l2IOMode req_mode;