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v4l2src: add a function pointer for get_frame function and optimize a bit

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Use a function-pointer for mmap/read, as this can't change during capture. Also
sprinkle a few G_LIKELY/UNLIKELY to improve the error-less code path.
This commit is contained in:
Stefan Kost 2009-09-11 22:24:47 +03:00
parent 1a945a32cc
commit 00ffa9c2dd
2 changed files with 18 additions and 8 deletions
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22
sys/v4l2/gstv4l2src.c
View file

@ -202,6 +202,12 @@ static void gst_v4l2src_set_property (GObject * object, guint prop_id,
static void gst_v4l2src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
/* get_frame io methods */
static GstFlowReturn
gst_v4l2src_get_read (GstV4l2Src * v4l2src, GstBuffer ** buf);
static GstFlowReturn
gst_v4l2src_get_mmap (GstV4l2Src * v4l2src, GstBuffer ** buf);
static void
gst_v4l2src_base_init (gpointer g_class)
{
@ -616,6 +622,12 @@ gst_v4l2src_set_caps (GstBaseSrc * src, GstCaps * caps)
if (!gst_v4l2src_capture_init (v4l2src, caps))
return FALSE;
if (v4l2src->use_mmap) {
v4l2src->get_frame = gst_v4l2src_get_mmap;
} else {
v4l2src->get_frame = gst_v4l2src_get_read;
}
if (!gst_v4l2src_capture_start (v4l2src))
return FALSE;
@ -850,7 +862,7 @@ gst_v4l2src_get_mmap (GstV4l2Src * v4l2src, GstBuffer ** buf)
again:
ret = gst_v4l2src_grab_frame (v4l2src, &temp);
if (ret != GST_FLOW_OK)
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto done;
if (v4l2src->frame_byte_size > 0) {
@ -889,13 +901,9 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
GstFlowReturn ret;
if (v4l2src->use_mmap) {
ret = gst_v4l2src_get_mmap (v4l2src, buf);
} else {
ret = gst_v4l2src_get_read (v4l2src, buf);
}
ret = v4l2src->get_frame (v4l2src, buf);
/* set buffer metadata */
if (ret == GST_FLOW_OK && *buf) {
if (G_LIKELY (ret == GST_FLOW_OK && *buf)) {
GstClock *clock;
GstClockTime timestamp;

4
sys/v4l2/gstv4l2src.h
View file

@ -45,7 +45,7 @@ G_BEGIN_DECLS
typedef struct _GstV4l2Src GstV4l2Src;
typedef struct _GstV4l2SrcClass GstV4l2SrcClass;
typedef GstFlowReturn (*GstV4l2SrcGetFunc)(GstV4l2Src * v4l2src, GstBuffer ** buf);
/**
* GstV4l2Src:
@ -80,6 +80,8 @@ struct _GstV4l2Src
guint64 offset;
gint fps_d, fps_n; /* framerate if device is open */
GstV4l2SrcGetFunc get_frame;
};
struct _GstV4l2SrcClass