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adapter: optimize progressive masked_scan

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Retain the last scanned buffer entry and offset, so we can resume buffer
scanning there in case of a typical progressive scan.
Also potentially optimize _copy subsequently occurring in that area.
This commit is contained in:
Mark Nauwelaerts 2010-05-27 15:13:18 +02:00
parent d5ed339f20
commit 7e23719a74
1 changed files with 32 additions and 2 deletions
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34
libs/gst/base/gstadapter.c
View file

@ -125,6 +125,9 @@ struct _GstAdapterPrivate
{
GstClockTime timestamp;
guint64 distance;
guint scan_offset;
GSList *scan_entry;
};
#define _do_init(thing) \
@ -215,6 +218,8 @@ gst_adapter_clear (GstAdapter * adapter)
adapter->assembled_len = 0;
adapter->priv->timestamp = GST_CLOCK_TIME_NONE;
adapter->priv->distance = 0;
adapter->priv->scan_offset = 0;
adapter->priv->scan_entry = NULL;
}
static inline void
@ -241,7 +246,13 @@ copy_into_unchecked (GstAdapter * adapter, guint8 * dest, guint skip,
guint bsize, csize;
/* first step, do skipping */
g = adapter->buflist;
/* we might well be copying where we were scanning */
if (adapter->priv->scan_entry && (adapter->priv->scan_offset <= skip)) {
g = adapter->priv->scan_entry;
skip -= adapter->priv->scan_offset;
} else {
g = adapter->buflist;
}
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
while (G_UNLIKELY (skip >= bsize)) {
@ -352,6 +363,10 @@ gst_adapter_try_to_merge_up (GstAdapter * adapter, guint size)
adapter->buflist = g_slist_delete_link (adapter->buflist, adapter->buflist);
g->data = head;
/* invalidate scan position */
adapter->priv->scan_offset = 0;
adapter->priv->scan_entry = NULL;
g = g_slist_next (g);
}
@ -514,6 +529,9 @@ gst_adapter_flush_unchecked (GstAdapter * adapter, guint flush)
/* account for the remaining bytes */
adapter->skip = flush;
adapter->priv->distance += flush;
/* invalidate scan position */
priv->scan_offset = 0;
priv->scan_entry = NULL;
}
void
@ -786,12 +804,22 @@ gst_adapter_masked_scan_uint32_peek (GstAdapter * adapter, guint32 mask,
skip = offset + adapter->skip;
/* first step, do skipping and position on the first buffer */
g = adapter->buflist;
/* optimistically assume scanning continues sequentially */
if (adapter->priv->scan_entry && (adapter->priv->scan_offset <= skip)) {
g = adapter->priv->scan_entry;
skip -= adapter->priv->scan_offset;
} else {
g = adapter->buflist;
adapter->priv->scan_offset = 0;
adapter->priv->scan_entry = NULL;
}
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
while (G_UNLIKELY (skip >= bsize)) {
skip -= bsize;
g = g_slist_next (g);
adapter->priv->scan_offset += bsize;
adapter->priv->scan_entry = g;
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
}
@ -825,6 +853,8 @@ gst_adapter_masked_scan_uint32_peek (GstAdapter * adapter, guint32 mask,
/* nothing found yet, go to next buffer */
skip += bsize;
g = g_slist_next (g);
adapter->priv->scan_offset += GST_BUFFER_SIZE (buf);
adapter->priv->scan_entry = g;
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
bdata = GST_BUFFER_DATA (buf);