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API: gst_adapter_copy() that can reduce the amount of memcpy when getting data from the adapter. Fixes #388201.

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Original commit message from CVS:
Patch by: David Schleef <ds at schleef dot org>
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstadapter.c: (gst_adapter_copy):
* libs/gst/base/gstadapter.h:
API: gst_adapter_copy() that can reduce the amount of memcpy when
getting data from the adapter. Fixes #388201.
This commit is contained in:
David Schleef 2007-01-25 10:50:03 +00:00 committed by Wim Taymans
parent 00a8f6ac84
commit 8be2913771
4 changed files with 65 additions and 0 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2007-01-25 Wim Taymans <wim@fluendo.com>
Patch by: David Schleef <ds at schleef dot org>
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstadapter.c: (gst_adapter_copy):
* libs/gst/base/gstadapter.h:
API: gst_adapter_copy() that can reduce the amount of memcpy when
getting data from the adapter. Fixes #388201.
2007-01-25 Edward Hervey <edward@fluendo.com>
* gst/gstregistrybinary.c: (gst_registry_binary_read_cache):

1
docs/libs/gstreamer-libs-sections.txt
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@ -123,6 +123,7 @@ gst_adapter_new
gst_adapter_clear
gst_adapter_push
gst_adapter_peek
gst_adapter_copy
gst_adapter_flush
gst_adapter_available
gst_adapter_available_fast

52
libs/gst/base/gstadapter.c
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@ -302,6 +302,58 @@ gst_adapter_peek (GstAdapter * adapter, guint size)
return adapter->assembled_data;
}
/**
* gst_adapter_copy:
* @adapter: a #GstAdapter
* @dest: the memory where to copy to
* @offset: the bytes offset in the adapter to start from
* @size: the number of bytes to copy
*
* Copies @size bytes of data starting at @offset out of the buffers
* contained in @GstAdapter into an array @dest provided by the caller.
*
* The array @dest should be large enough to contain @size bytes.
* The user should check that the adapter has (@offset + @size) bytes
* available before calling this function.
*
* Since: 0.10.12
*/
void
gst_adapter_copy (GstAdapter * adapter, guint8 * dest, guint offset, guint size)
{
GSList *g;
int skip;
g_return_if_fail (GST_IS_ADAPTER (adapter));
g_return_if_fail (size > 0);
/* we don't have enough data, return. This is unlikely
* as one usually does an _available() first instead of copying a
* random size. */
if (G_UNLIKELY (offset + size > adapter->size))
return;
skip = adapter->skip;
for (g = adapter->buflist; g && size > 0; g = g_slist_next (g)) {
GstBuffer *buf;
buf = g->data;
if (offset < GST_BUFFER_SIZE (buf) - skip) {
int n;
n = MIN (GST_BUFFER_SIZE (buf) - skip - offset, size);
memcpy (dest, GST_BUFFER_DATA (buf) + skip + offset, n);
dest += n;
offset = 0;
size -= n;
} else {
offset -= GST_BUFFER_SIZE (buf) - skip;
}
skip = 0;
}
}
/**
* gst_adapter_flush:
* @adapter: a #GstAdapter

2
libs/gst/base/gstadapter.h
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@ -78,6 +78,8 @@ GstAdapter * gst_adapter_new (void);
void gst_adapter_clear (GstAdapter *adapter);
void gst_adapter_push (GstAdapter *adapter, GstBuffer* buf);
const guint8 * gst_adapter_peek (GstAdapter *adapter, guint size);
void gst_adapter_copy (GstAdapter *adapter, guint8 *dest,
guint offset, guint size);
void gst_adapter_flush (GstAdapter *adapter, guint flush);
guint8* gst_adapter_take (GstAdapter *adapter, guint nbytes);
GstBuffer* gst_adapter_take_buffer (GstAdapter *adapter, guint nbytes);