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basetransform: Fix code path to come up with possible caps if incompatible caps are provided to buffer_alloc()

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Previous code could almost never work and this should be slightly
better.
This commit is contained in:
Sebastian Dröge 2011-12-08 18:00:00 +01:00
parent 57573d8705
commit a6bb6d0fc3
1 changed files with 29 additions and 10 deletions
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39
libs/gst/base/gstbasetransform.c
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@ -1824,7 +1824,6 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
GstBaseTransform *trans;
GstBaseTransformClass *klass;
GstBaseTransformPrivate *priv;
GstFlowReturn res;
gboolean alloced = FALSE;
@ -1835,7 +1834,6 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
if (G_UNLIKELY (trans == NULL))
return GST_FLOW_WRONG_STATE;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
priv = trans->priv;
GST_DEBUG_OBJECT (pad, "alloc with caps %p %" GST_PTR_FORMAT ", size %u",
@ -1976,8 +1974,7 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
}
if (new_caps && (suggest || !gst_caps_can_intersect (sink_suggest, templ))) {
GstCaps *allowed;
GstCaps *peercaps;
GstCaps *allowed, *peercaps;
GST_DEBUG_OBJECT (trans,
"Requested pad alloc caps are not supported: %" GST_PTR_FORMAT,
@ -1990,25 +1987,47 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GST_DEBUG_OBJECT (trans,
"pads could agree on one of the following caps: " "%"
GST_PTR_FORMAT, allowed);
allowed = gst_caps_make_writable (allowed);
if (klass->fixate_caps) {
peercaps =
gst_pad_get_allowed_caps (GST_BASE_TRANSFORM_SRC_PAD (trans));
klass->fixate_caps (trans, GST_PAD_SRC, peercaps, allowed);
/* Check which caps would be possible with downstream */
peercaps =
gst_pad_get_allowed_caps (GST_BASE_TRANSFORM_SRC_PAD (trans));
if (peercaps) {
GstCaps *tmp, *intersect;
tmp =
gst_base_transform_transform_caps (trans, GST_PAD_SRC, peercaps);
gst_caps_unref (peercaps);
intersect = gst_caps_intersect (allowed, tmp);
gst_caps_unref (tmp);
gst_caps_unref (allowed);
if (gst_caps_is_empty (intersect)) {
gst_caps_unref (intersect);
goto not_supported;
}
allowed = intersect;
}
allowed = gst_caps_make_writable (allowed);
/* Fixate them to be safe if the subclass didn't do it */
gst_caps_truncate (allowed);
gst_pad_fixate_caps (pad, allowed);
if (!gst_caps_is_fixed (allowed)) {
GST_ERROR_OBJECT (trans, "Impossible to fixate any caps");
gst_caps_unref (allowed);
goto not_supported;
}
gst_caps_replace (&sink_suggest, allowed);
gst_caps_unref (allowed);
suggest = TRUE;
new_caps = !gst_caps_is_equal (sink_suggest, priv->sink_alloc);
GST_DEBUG_OBJECT (trans, "Fixated suggestion caps to %"
GST_DEBUG_OBJECT (trans, "Calculated new suggestion caps %"
GST_PTR_FORMAT, sink_suggest);
} else {
if (allowed)