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v4l2sink: add "min-queued-bufs" property

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This commit is contained in:
Rob Clark 2010-04-04 06:28:51 -05:00
parent 0cec72b97e
commit 61db502a12
2 changed files with 18 additions and 1 deletions
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18
sys/v4l2/gstv4l2sink.c
View file

@ -57,6 +57,7 @@ GST_DEBUG_CATEGORY (v4l2sink_debug);
#define GST_CAT_DEFAULT v4l2sink_debug
#define PROP_DEF_QUEUE_SIZE 12
#define PROP_DEF_MIN_QUEUED_BUFS 1
#define DEFAULT_PROP_DEVICE "/dev/video1"
enum
@ -64,6 +65,7 @@ enum
PROP_0,
V4L2_STD_OBJECT_PROPS,
PROP_QUEUE_SIZE,
PROP_MIN_QUEUED_BUFS,
PROP_OVERLAY_TOP,
PROP_OVERLAY_LEFT,
PROP_OVERLAY_WIDTH,
@ -229,6 +231,12 @@ gst_v4l2sink_class_init (GstV4l2SinkClass * klass)
"Number of buffers to be enqueud in the driver in streaming mode",
GST_V4L2_MIN_BUFFERS, GST_V4L2_MAX_BUFFERS, PROP_DEF_QUEUE_SIZE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MIN_QUEUED_BUFS,
g_param_spec_uint ("min-queued-bufs", "Minimum queued bufs",
"Minimum number of queued bufs; v4l2sink won't dqbuf if the driver "
"doesn't have more than this number (which normally you shouldn't change)",
0, GST_V4L2_MAX_BUFFERS, PROP_DEF_MIN_QUEUED_BUFS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OVERLAY_TOP,
g_param_spec_int ("overlay-top", "Overlay top",
"The topmost (y) coordinate of the video overlay; top left corner of screen is 0,0",
@ -268,6 +276,7 @@ gst_v4l2sink_init (GstV4l2Sink * v4l2sink, GstV4l2SinkClass * klass)
/* number of buffers requested */
v4l2sink->num_buffers = PROP_DEF_QUEUE_SIZE;
v4l2sink->min_queued_bufs = PROP_DEF_MIN_QUEUED_BUFS;
v4l2sink->probed_caps = NULL;
v4l2sink->current_caps = NULL;
@ -370,6 +379,9 @@ gst_v4l2sink_set_property (GObject * object,
case PROP_QUEUE_SIZE:
v4l2sink->num_buffers = g_value_get_uint (value);
break;
case PROP_MIN_QUEUED_BUFS:
v4l2sink->min_queued_bufs = g_value_get_uint (value);
break;
case PROP_OVERLAY_TOP:
v4l2sink->overlay.top = g_value_get_int (value);
v4l2sink->overlay_fields_set |= OVERLAY_TOP_SET;
@ -410,6 +422,9 @@ gst_v4l2sink_get_property (GObject * object,
case PROP_QUEUE_SIZE:
g_value_set_uint (value, v4l2sink->num_buffers);
break;
case PROP_MIN_QUEUED_BUFS:
g_value_set_uint (value, v4l2sink->min_queued_bufs);
break;
case PROP_OVERLAY_TOP:
g_value_set_int (value, v4l2sink->overlay.top);
break;
@ -701,7 +716,8 @@ gst_v4l2sink_show_frame (GstBaseSink * bsink, GstBuffer * buf)
* just queued, then dequeue one immediately to make it available via
* _buffer_alloc():
*/
if (gst_v4l2_buffer_pool_available_buffers (v4l2sink->pool) > 1) {
if (gst_v4l2_buffer_pool_available_buffers (v4l2sink->pool) >
v4l2sink->min_queued_bufs) {
GstV4l2Buffer *v4l2buf = gst_v4l2_buffer_pool_dqbuf (v4l2sink->pool);
/* note: if we get a buf, we don't want to use it directly (because

1
sys/v4l2/gstv4l2sink.h
View file

@ -58,6 +58,7 @@ struct _GstV4l2Sink {
GstCaps *current_caps; /* the current negotiated caps */
GstV4l2BufferPool *pool;
guint32 num_buffers;
guint32 min_queued_bufs;
/*
* field to store requested overlay-top/left/width/height props: