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collectpads: avoid doing subbuffers when we can

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In some cases we can avoid allocating a subbuffer and instead simply ref
the buffer. Callers should perform _make_metadata_writable() in all
cases now.
This commit is contained in:
Wim Taymans 2009-12-24 16:53:15 +01:00 committed by Wim Taymans
parent 4718b7ef09
commit 633e8f4d9f
1 changed files with 12 additions and 7 deletions
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17
libs/gst/base/gstcollectpads.c
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@ -929,13 +929,13 @@ gst_collect_pads_read (GstCollectPads * pads, GstCollectData * data,
* @data: the data to use
* @size: the number of bytes to read
*
* Get a subbuffer of @size bytes from the given pad @data.
* Get a buffer of @size bytes from the given pad @data.
*
* This function should be called with @pads LOCK held, such as in the callback.
*
* Since: 0.10.18
*
* Returns: A sub buffer. The size of the buffer can be less that requested.
* Returns: A #GstBuffer. The size of the buffer can be less that requested.
* A return of NULL signals that the pad is end-of-stream.
* Unref the buffer after use.
*
@ -945,7 +945,7 @@ GstBuffer *
gst_collect_pads_read_buffer (GstCollectPads * pads, GstCollectData * data,
guint size)
{
guint readsize;
guint readsize, bufsize;
GstBuffer *buffer;
g_return_val_if_fail (pads != NULL, NULL);
@ -956,8 +956,13 @@ gst_collect_pads_read_buffer (GstCollectPads * pads, GstCollectData * data,
if ((buffer = data->buffer) == NULL)
return NULL;
readsize = MIN (size, GST_BUFFER_SIZE (buffer) - data->pos);
bufsize = GST_BUFFER_SIZE (buffer);
readsize = MIN (size, bufsize - data->pos);
if (data->pos == 0 && readsize == bufsize)
return gst_buffer_ref (buffer);
else
return gst_buffer_create_sub (buffer, data->pos, readsize);
}
@ -967,14 +972,14 @@ gst_collect_pads_read_buffer (GstCollectPads * pads, GstCollectData * data,
* @data: the data to use
* @size: the number of bytes to read
*
* Get a subbuffer of @size bytes from the given pad @data. Flushes the amount
* Get a buffer of @size bytes from the given pad @data. Flushes the amount
* of read bytes.
*
* This function should be called with @pads LOCK held, such as in the callback.
*
* Since: 0.10.18
*
* Returns: A sub buffer. The size of the buffer can be less that requested.
* Returns: A #GstBuffer. The size of the buffer can be less that requested.
* A return of NULL signals that the pad is end-of-stream.
* Unref the buffer after use.
*