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adapter: avoid branch in copy code

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Wim Taymans 2009-05-20 10:27:43 +02:00 committed by Wim Taymans
parent b47f425069
commit 9197f4399b
1 changed files with 22 additions and 21 deletions
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43
libs/gst/base/gstadapter.c
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@ -240,29 +240,26 @@ copy_into_unchecked (GstAdapter * adapter, guint8 * dest, guint skip,
GstBuffer *buf;
guint bsize, csize;
/* first step, do skipping and copy partial first buffer, we don't have to
* check for valid list entries, we keep things consistent. */
/* first step, do skipping */
g = adapter->buflist;
while (skip > 0) {
buf = g->data;
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
while (skip >= bsize) {
skip -= bsize;
g = g_slist_next (g);
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
if (G_LIKELY (skip < bsize)) {
/* last bit */
csize = MIN (bsize - skip, size);
memcpy (dest, GST_BUFFER_DATA (buf) + skip, csize);
size -= csize;
dest += csize;
/* break out and move to next step */
break;
} else {
skip -= bsize;
}
}
/* copy partial buffer */
csize = MIN (bsize - skip, size);
memcpy (dest, GST_BUFFER_DATA (buf) + skip, csize);
size -= csize;
dest += csize;
/* second step, copy remainder */
while (size > 0) {
buf = g->data;
g = g_slist_next (g);
buf = g->data;
csize = MIN (GST_BUFFER_SIZE (buf), size);
memcpy (dest, GST_BUFFER_DATA (buf), csize);
size -= csize;
@ -735,6 +732,7 @@ gst_adapter_masked_scan_uint32 (GstAdapter * adapter, guint32 mask,
guint skip, bsize, i;
guint32 state;
guint8 *bdata;
GstBuffer *buf;
g_return_val_if_fail (size > 0, -1);
g_return_val_if_fail (offset + size <= adapter->size, -1);
@ -747,15 +745,17 @@ gst_adapter_masked_scan_uint32 (GstAdapter * adapter, guint32 mask,
/* first step, do skipping and position on the first buffer */
g = adapter->buflist;
bsize = GST_BUFFER_SIZE (g->data);
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
while (skip >= bsize) {
skip -= bsize;
g = g_slist_next (g);
bsize = GST_BUFFER_SIZE (g->data);
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
}
/* get the data now */
bsize -= skip;
bdata = GST_BUFFER_DATA (g->data) + skip;
bdata = GST_BUFFER_DATA (buf) + skip;
/* set the state to something that does not match */
state = ~pattern;
@ -775,8 +775,9 @@ gst_adapter_masked_scan_uint32 (GstAdapter * adapter, guint32 mask,
/* nothing found yet, go to next buffer */
offset += bsize;
g = g_slist_next (g);
bsize = GST_BUFFER_SIZE (g->data);
bdata = GST_BUFFER_DATA (g->data);
buf = g->data;
bsize = GST_BUFFER_SIZE (buf);
bdata = GST_BUFFER_DATA (buf);
}
}
/* nothing found */