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email about bufferpool replacement

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Original commit message from CVS:
email about bufferpool replacement
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David Schleef 2004-01-08 21:59:00 +00:00
parent de60fbda38
commit 5d7159b887
1 changed files with 57 additions and 0 deletions
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On Thu, Jan 08, 2004 at 04:10:00PM +0100, Julien MOUTTE wrote:
>
> Hi David,
>
> I'd like to implement bufferpools again in x[v]imagesink asap.. Could
> you please point me to a template/doc on how to do that ?
>
> The best for me would be a simple testcase showing how to use the buffer
> free methods to replace bufferpools.
x[v]imagesink should call gst_pad_set_bufferalloc_function() on
their sink pads with a bufferalloc implementation. This bufferalloc
function is to allocate buffers that _peers_ will send _to_ that pad.
A trivial version of a bufferalloc function, i.e., one that just
allocates normal buffers:
static GstBuffer *
gst_ximagesink_sink_bufferalloc (GstPad *pad, guint64 offset, guint
size)
{
GstBuffer *buffer;
buffer = gst_buffer_new_and_alloc (size);
GST_DATA_FREE_FUNC (data) = gst_ximagesink_buffer_free;
GST_BUFFER_POOL_PRIVATE (data) = ximagesink; /* whatever */
return buffer;
}
static void
gst_ximagesink_buffer_free (GstData *data)
{
g_free (GST_BUFFER_DATA (data));
}
The hard part is going through each element, and every time it
allocates a buffer using gst_buffer_new_and_alloc () that is then
sent to a sink pad, the call should be replaced with
gst_pad_alloc_buffer (sinkpad, offset, size).
dave...
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