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libs/gst/base/gstbasetransform.c: Use OBJECT_LOCK and refcounting to get the pad caps in the buffer_alloc function be...

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Original commit message from CVS:
* libs/gst/base/gstbasetransform.c:
(gst_base_transform_buffer_alloc):
Use OBJECT_LOCK and refcounting to get the pad caps in the
buffer_alloc function because the caps could change while we are
busy with them. Fixes #349105
This commit is contained in:
Wim Taymans 2006-07-31 15:12:59 +00:00
parent 1e944b75aa
commit 2d6cf77ed4
1 changed files with 39 additions and 8 deletions
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47
libs/gst/base/gstbasetransform.c
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@ -1063,24 +1063,37 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
/* if we are configured, request a buffer with the src caps */
GstCaps *srccaps;
GstCaps *sinkcaps;
gboolean configured;
srccaps = GST_PAD_CAPS (trans->srcpad);
if (!srccaps)
/* take lock, peek if the caps are ok */
GST_OBJECT_LOCK (trans->sinkpad);
sinkcaps = GST_PAD_CAPS (trans->sinkpad);
configured = (sinkcaps == NULL || gst_caps_is_equal (sinkcaps, caps));
GST_OBJECT_UNLOCK (trans->sinkpad);
if (!configured)
goto not_configured;
sinkcaps = GST_PAD_CAPS (trans->sinkpad);
if (sinkcaps != NULL && !gst_caps_is_equal (sinkcaps, caps))
/* take lock on srcpad to grab the caps, caps can change when pushing a
* buffer. */
GST_OBJECT_LOCK (trans->srcpad);
if ((srccaps = GST_PAD_CAPS (trans->srcpad)))
gst_caps_ref (srccaps);
GST_OBJECT_UNLOCK (trans->srcpad);
if (!srccaps)
goto not_configured;
GST_DEBUG_OBJECT (trans, "calling transform_size");
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (pad), caps, size, srccaps, &new_size)) {
gst_caps_unref (srccaps);
goto unknown_size;
}
res =
gst_pad_alloc_buffer_and_set_caps (trans->srcpad, offset, new_size,
srccaps, buf);
gst_caps_unref (srccaps);
}
if (res == GST_FLOW_OK && !trans->have_same_caps) {
@ -1092,21 +1105,39 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps *sinkcaps;
GstCaps *srccaps;
sinkcaps = GST_PAD_CAPS (trans->sinkpad);
GST_OBJECT_LOCK (trans->sinkpad);
if ((sinkcaps = GST_PAD_CAPS (trans->sinkpad)))
gst_caps_ref (sinkcaps);
GST_OBJECT_UNLOCK (trans->sinkpad);
if (!sinkcaps)
goto not_configured;
srccaps = GST_PAD_CAPS (trans->srcpad);
GST_OBJECT_LOCK (trans->srcpad);
if ((srccaps = GST_PAD_CAPS (trans->srcpad)))
gst_caps_ref (srccaps);
GST_OBJECT_UNLOCK (trans->srcpad);
if (!srccaps) {
gst_caps_unref (sinkcaps);
goto not_configured;
}
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->srcpad), srccaps, GST_BUFFER_SIZE (*buf),
sinkcaps, &new_size))
sinkcaps, &new_size)) {
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
goto unknown_size;
}
/* don't need the caps anymore now */
gst_caps_unref (srccaps);
gst_buffer_unref (*buf);
*buf = gst_buffer_new_and_alloc (new_size);
gst_buffer_set_caps (*buf, sinkcaps);
GST_BUFFER_OFFSET (*buf) = offset;
/* set caps, gives away the ref */
GST_BUFFER_CAPS (*buf) = sinkcaps;
res = GST_FLOW_OK;
}