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v4l2src: add decimate property

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This commit is contained in:
David Schleef 2009-06-29 11:43:07 -07:00
parent 75d0795e53
commit 178c57be4f
2 changed files with 26 additions and 1 deletions
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25
sys/v4l2/gstv4l2src.c
View file

@ -63,6 +63,7 @@ GST_DEBUG_CATEGORY (v4l2src_debug);
#define PROP_DEF_QUEUE_SIZE 2
#define PROP_DEF_ALWAYS_COPY TRUE
#define PROP_DEF_DECIMATE 1
#define DEFAULT_PROP_DEVICE "/dev/video0"
@ -71,7 +72,8 @@ enum
PROP_0,
V4L2_STD_OBJECT_PROPS,
PROP_QUEUE_SIZE,
PROP_ALWAYS_COPY
PROP_ALWAYS_COPY,
PROP_DECIMATE
};
GST_IMPLEMENT_V4L2_PROBE_METHODS (GstV4l2SrcClass, gst_v4l2src);
@ -264,6 +266,10 @@ gst_v4l2src_class_init (GstV4l2SrcClass * klass)
g_param_spec_boolean ("always-copy", "Always Copy",
"If the buffer will or not be used directly from mmap",
PROP_DEF_ALWAYS_COPY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DECIMATE,
g_param_spec_int ("decimate", "Decimate",
"Only use every nth frame", 1, G_MAXINT,
PROP_DEF_DECIMATE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
basesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_v4l2src_get_caps);
basesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_v4l2src_set_caps);
@ -290,6 +296,7 @@ gst_v4l2src_init (GstV4l2Src * v4l2src, GstV4l2SrcClass * klass)
v4l2src->num_buffers = PROP_DEF_QUEUE_SIZE;
v4l2src->always_copy = PROP_DEF_ALWAYS_COPY;
v4l2src->decimate = PROP_DEF_DECIMATE;
v4l2src->is_capturing = FALSE;
@ -338,6 +345,9 @@ gst_v4l2src_set_property (GObject * object,
case PROP_ALWAYS_COPY:
v4l2src->always_copy = g_value_get_boolean (value);
break;
case PROP_DECIMATE:
v4l2src->decimate = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -361,6 +371,9 @@ gst_v4l2src_get_property (GObject * object,
case PROP_ALWAYS_COPY:
g_value_set_boolean (value, v4l2src->always_copy);
break;
case PROP_DECIMATE:
g_value_set_int (value, v4l2src->decimate);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -910,9 +923,19 @@ static GstFlowReturn
gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
int i;
GstFlowReturn ret;
for (i = 0; i < v4l2src->decimate - 1; i++) {
ret = v4l2src->get_frame (v4l2src, buf);
if (ret != GST_FLOW_OK) {
return ret;
}
gst_buffer_unref (*buf);
}
ret = v4l2src->get_frame (v4l2src, buf);
/* set buffer metadata */
if (G_LIKELY (ret == GST_FLOW_OK && *buf)) {
GstClock *clock;

2
sys/v4l2/gstv4l2src.h
View file

@ -73,6 +73,8 @@ struct _GstV4l2Src
/* if the buffer will be or not used from directly mmap */
gboolean always_copy;
int decimate;
/* True if we want to stop */
gboolean quit;
gboolean is_capturing;