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adapter: reuse more data in _peek()

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Optimize _peek() some more by reusing already assembled data when we can.
This commit is contained in:
Wim Taymans 2010-09-17 15:07:50 +02:00
parent 961e2029db
commit a144882871
1 changed files with 23 additions and 7 deletions
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30
libs/gst/base/gstadapter.c
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@ -392,6 +392,8 @@ gst_adapter_peek (GstAdapter * adapter, guint size)
{
GstBuffer *cur;
guint skip;
guint toreuse, tocopy;
guint8 *data;
g_return_val_if_fail (GST_IS_ADAPTER (adapter), NULL);
g_return_val_if_fail (size > 0, NULL);
@ -421,21 +423,35 @@ gst_adapter_peek (GstAdapter * adapter, guint size)
return GST_BUFFER_DATA (cur) + skip;
}
/* see how much data we can reuse from the assembled memory and how much
* we need to copy */
toreuse = adapter->assembled_len;
tocopy = size - toreuse;
/* Gonna need to copy stuff out */
if (G_UNLIKELY (adapter->assembled_size < size)) {
adapter->assembled_size = (size / DEFAULT_SIZE + 1) * DEFAULT_SIZE;
GST_DEBUG_OBJECT (adapter, "resizing internal buffer to %u",
adapter->assembled_size);
/* no g_realloc to avoid a memcpy that is not desired here since we are
* going to copy new data into the area below */
g_free (adapter->assembled_data);
adapter->assembled_data = g_malloc (adapter->assembled_size);
if (toreuse == 0) {
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "alloc new buffer");
/* no g_realloc to avoid a memcpy that is not desired here since we are
* not going to reuse any data here */
g_free (adapter->assembled_data);
adapter->assembled_data = g_malloc (adapter->assembled_size);
} else {
/* we are going to reuse all data, realloc then */
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "reusing %u bytes", toreuse);
adapter->assembled_data =
g_realloc (adapter->assembled_data, adapter->assembled_size);
}
}
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy remaining %u bytes from adapter",
tocopy);
data = adapter->assembled_data;
copy_into_unchecked (adapter, data + toreuse, skip + toreuse, tocopy);
adapter->assembled_len = size;
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy data from adapter");
copy_into_unchecked (adapter, adapter->assembled_data, skip, size);
return adapter->assembled_data;
}