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pad: prototype of pad push cache

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Prototype of how we can cache the peer and caps for a pad link.
This commit is contained in:
Wim Taymans 2010-10-12 12:29:49 +02:00
parent 7106cabce3
commit d59b7f81b7
1 changed files with 83 additions and 1 deletions
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84
gst/gstpad.c
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@ -95,6 +95,14 @@ enum
/* FILL ME */
};
typedef struct _GstPadPushCache GstPadPushCache;
struct _GstPadPushCache
{
GstPad *peer; /* reffed peer pad */
GstCaps *caps; /* caps for this link */
};
#define GST_PAD_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PAD, GstPadPrivate))
@ -103,6 +111,9 @@ enum
struct _GstPadPrivate
{
GstPadChainListFunction chainlistfunc;
GstPadPushCache cache_slot;
GstPadPushCache *cache_ptr;
};
static void gst_pad_dispose (GObject * object);
@ -2087,9 +2098,28 @@ gst_pad_link_full (GstPad * srcpad, GstPad * sinkpad, GstPadLinkCheck flags)
GST_OBJECT_LOCK (sinkpad);
if (result == GST_PAD_LINK_OK) {
GstPadPushCache *cache, *old;
gpointer *cache_ptr;
GST_OBJECT_UNLOCK (sinkpad);
GST_OBJECT_UNLOCK (srcpad);
cache_ptr = (gpointer *) & srcpad->abidata.ABI.priv->cache_ptr;
/* make cache structure */
cache = g_slice_new (GstPadPushCache);
cache->peer = gst_object_ref (sinkpad);
cache->caps = NULL;
do {
old = g_atomic_pointer_get (cache_ptr);
} while (!g_atomic_pointer_compare_and_exchange (cache_ptr, old, cache));
if (old) {
gst_object_unref (old->peer);
gst_caps_unref (old->caps);
g_slice_free (GstPadPushCache, old);
}
/* fire off a signal to each of the pads telling them
* that they've been linked */
g_signal_emit (srcpad, gst_pad_signals[PAD_LINKED], 0, sinkpad);
@ -4490,6 +4520,33 @@ not_negotiated:
}
}
static GstPadPushCache *
pad_take_cache (GstPad * pad, gpointer * cache_ptr)
{
GstPadPushCache *cache;
/* try to get the cached data */
do {
cache = g_atomic_pointer_get (cache_ptr);
/* now try to replace the pointer with NULL to mark that we are busy
* with it */
} while (!g_atomic_pointer_compare_and_exchange (cache_ptr, cache, NULL));
return cache;
}
static void
pad_put_cache (GstPad * pad, GstPadPushCache * cache, gpointer * cache_ptr)
{
/* put it back */
if (!g_atomic_pointer_compare_and_exchange (cache_ptr, NULL, cache)) {
/* something changed, clean up our cache */
gst_object_unref (cache->peer);
gst_caps_unref (cache->caps);
g_slice_free (GstPadPushCache, cache);
}
}
/**
* gst_pad_push:
* @pad: a source #GstPad, returns #GST_FLOW_ERROR if not.
@ -4519,11 +4576,36 @@ not_negotiated:
GstFlowReturn
gst_pad_push (GstPad * pad, GstBuffer * buffer)
{
GstPadPushCache *cache;
GstFlowReturn ret;
gpointer *cache_ptr;
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
return gst_pad_push_data (pad, TRUE, buffer);
cache_ptr = (gpointer *) & pad->abidata.ABI.priv->cache_ptr;
cache = pad_take_cache (pad, cache_ptr);
if (G_LIKELY (cache)) {
GstPad *peer = cache->peer;
/* FIXME check cookies and caps */
GST_PAD_STREAM_LOCK (peer);
/* fast path */
ret = GST_PAD_CHAINFUNC (peer) (peer, buffer);
GST_PAD_STREAM_UNLOCK (peer);
pad_put_cache (pad, cache, cache_ptr);
} else {
/* slow path */
ret = gst_pad_push_data (pad, TRUE, buffer);
}
return ret;
}
/**