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libs/gst/base/gsttypefindhelper.c: Sort buffer cache list by end offsets. This makes sure that we don't stop to searc...

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Original commit message from CVS:
* libs/gst/base/gsttypefindhelper.c: (helper_find_peek):
Sort buffer cache list by end offsets. This makes sure that we don't
stop to search for a cached buffer that contains the requested data
too early.
Also read a minimum of 4k bytes instead of 512 bytes as this is a bit
more efficient. Fixes bug #459862.
This commit is contained in:
Sebastian Dröge 2008-05-16 21:09:45 +00:00
parent f6b8cf77d9
commit 654ba215df
3 changed files with 16 additions and 10 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2008-05-16 Sebastian Dröge <slomo@circular-chaos.org>
* libs/gst/base/gsttypefindhelper.c: (helper_find_peek):
Sort buffer cache list by end offsets. This makes sure that we don't
stop to search for a cached buffer that contains the requested data
too early.
Also read a minimum of 4k bytes instead of 512 bytes as this is a bit
more efficient. Fixes bug #459862.
2008-05-14 Stefan Kost <ensonic@users.sf.net>
* gst/gstinfo.c:

2
common

@ -1 +1 @@
Subproject commit d78efae300d4dff0291717ccf7a2b82c713a81ef
Subproject commit 3b3631082d04b426f450810e8836de94e9c5d60a

15
libs/gst/base/gsttypefindhelper.c
View file

@ -111,16 +111,14 @@ helper_find_peek (gpointer data, gint64 offset, guint size)
guint64 buf_offset = GST_BUFFER_OFFSET (buf);
guint buf_size = GST_BUFFER_SIZE (buf);
/* buffers are kept sorted by end offset (highest first) in the list, so
* at this point we save the current position and stop searching if
* we're after the searched end offset */
if (buf_offset <= offset) {
if ((offset + size) < (buf_offset + buf_size)) {
return GST_BUFFER_DATA (buf) + (offset - buf_offset);
}
/* buffers are kept sorted by offset (highest first) in the list, so
* at this point we know we don't need to check the remaining buffers
* (is that correct or just a guess that we're unlikely to find a
* match further down and it's most of the time not worth going through
* the entire list? How do we know the next buffer isn't offset-N with
* a big enough size to cover the requested offset+size?) */
} else if (offset + size >= buf_offset + buf_size) {
insert_pos = walk;
break;
}
@ -134,7 +132,7 @@ helper_find_peek (gpointer data, gint64 offset, guint size)
* of the file is also not a problem here, we'll just get a truncated buffer
* in that case (and we'll have to double-check the size we actually get
* anyway, see below) */
ret = helper->func (helper->obj, offset, MAX (size, 512), &buffer);
ret = helper->func (helper->obj, offset, MAX (size, 4096), &buffer);
if (ret != GST_FLOW_OK)
goto error;
@ -157,8 +155,7 @@ helper_find_peek (gpointer data, gint64 offset, guint size)
/* if insert_pos is not set, our offset is bigger than the largest offset
* we have so far; since we keep the list sorted with highest offsets
* first, we need to prepend the buffer to the list */
/* FIXME: why not last_offset = buffer_offset + buffer_size here? */
helper->last_offset = GST_BUFFER_OFFSET (buffer);
helper->last_offset = GST_BUFFER_OFFSET (buffer) + GST_BUFFER_SIZE (buffer);
helper->buffers = g_slist_prepend (helper->buffers, buffer);
}
return GST_BUFFER_DATA (buffer);