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basetransform: Refactor gst_base_transform_buffer_alloc() code

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Don't check if upstream provided caps are compatible with upstream
and don't try to fixate these caps. They must be fixated in any case.
This commit is contained in:
Sebastian Dröge 2011-12-08 17:02:28 +01:00
parent e7b3305f70
commit 26a1ac0ce7
1 changed files with 102 additions and 96 deletions
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198
libs/gst/base/gstbasetransform.c
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@ -1828,7 +1828,7 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstBaseTransformPrivate *priv;
GstFlowReturn res;
gboolean alloced = FALSE;
gboolean proxy, suggest, same_caps;
gboolean proxy, suggest, new_caps;
GstCaps *sink_suggest = NULL;
guint size_suggest;
@ -1850,32 +1850,33 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
/* we remember our previous alloc request to quickly see if we can proxy or
* not. We skip this check if we have a pending suggestion. */
GST_OBJECT_LOCK (pad);
same_caps = !priv->suggest_pending && caps &&
gst_caps_is_equal (priv->sink_alloc, caps);
suggest = priv->suggest_pending;
GST_OBJECT_UNLOCK (pad);
if (same_caps) {
/* we have seen this before, see below if we need to proxy */
GST_DEBUG_OBJECT (trans, "have old caps %p, size %u", caps, size);
if (!suggest) {
/* we have no suggestion, see below if we need to proxy */
gst_caps_replace (&sink_suggest, caps);
size_suggest = size;
suggest = FALSE;
} else {
GST_DEBUG_OBJECT (trans, "new format %p %" GST_PTR_FORMAT, caps, caps);
new_caps = sink_suggest
&& !gst_caps_is_equal (sink_suggest, priv->sink_alloc);
if (new_caps)
GST_DEBUG_OBJECT (trans, "new format %p %" GST_PTR_FORMAT, caps, caps);
else
GST_DEBUG_OBJECT (trans, "have old caps %p, size %u", caps, size);
} else {
/* if we have a suggestion, pretend we got these as input */
GST_OBJECT_LOCK (pad);
if ((priv->sink_suggest && !gst_caps_is_equal (caps, priv->sink_suggest))) {
if (priv->sink_suggest && !gst_caps_is_equal (caps, priv->sink_suggest)) {
sink_suggest = gst_caps_ref (priv->sink_suggest);
size_suggest = priv->size_suggest;
GST_DEBUG_OBJECT (trans, "have suggestion %p %" GST_PTR_FORMAT " size %u",
sink_suggest, sink_suggest, priv->size_suggest);
/* suggest is TRUE when we have a custom suggestion pending that we need
* to unref later. */
suggest = TRUE;
} else {
GST_DEBUG_OBJECT (trans, "using caps %p %" GST_PTR_FORMAT " size %u",
caps, caps, size);
GST_DEBUG_OBJECT (trans,
"have suggestion equal to upstream caps %p %" GST_PTR_FORMAT, caps,
caps);
gst_caps_replace (&sink_suggest, caps);
size_suggest = size;
suggest = FALSE;
@ -1884,8 +1885,7 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GST_OBJECT_UNLOCK (pad);
/* check if we actually handle this format on the sinkpad */
if (sink_suggest) {
const GstCaps *templ;
if (suggest) {
GstCaps *peercaps;
/* Always intersect with the peer caps to get correct
@ -1944,90 +1944,95 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GST_DEBUG_OBJECT (trans, "Caps fixed to: %" GST_PTR_FORMAT,
sink_suggest);
}
/* Check if the suggested caps are compatible with our
* sinkpad template caps and if they're not (or were
* empty after intersecting with the peer caps above)
* we try to come up with any supported caps
*/
if (sink_suggest) {
templ = gst_pad_get_pad_template_caps (pad);
if (!gst_caps_can_intersect (sink_suggest, templ)) {
GstCaps *allowed;
GstCaps *peercaps;
GST_DEBUG_OBJECT (trans,
"Requested pad alloc caps are not supported: %" GST_PTR_FORMAT,
sink_suggest);
/* the requested pad alloc caps are not supported, so let's try
* picking something allowed between the pads (they are linked,
* there must be something) */
allowed = gst_pad_get_allowed_caps (pad);
if (allowed && !gst_caps_is_empty (allowed)) {
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);
gst_caps_unref (peercaps);
}
/* Fixate them to be safe if the subclass didn't do it */
gst_caps_truncate (allowed);
gst_pad_fixate_caps (pad, allowed);
gst_caps_replace (&sink_suggest, allowed);
gst_caps_unref (allowed);
suggest = TRUE;
GST_DEBUG_OBJECT (trans, "Fixated suggestion caps to %"
GST_PTR_FORMAT, sink_suggest);
} else {
if (allowed)
gst_caps_unref (allowed);
goto not_supported;
}
}
}
}
/* find the best format for the other side here we decide if we will proxy
* the caps or not. */
if (sink_suggest == NULL) {
/* always proxy when the caps are NULL. When this is a new format, see if
* we can proxy it downstream */
GST_DEBUG_OBJECT (trans, "null caps, marking for proxy");
priv->proxy_alloc = TRUE;
} else {
GstCaps *othercaps;
new_caps = sink_suggest
&& !gst_caps_is_equal (sink_suggest, priv->sink_alloc);
}
/* we have a new format, see what we need to proxy to */
othercaps = gst_base_transform_find_transform (trans, pad, sink_suggest);
if (!othercaps || gst_caps_is_empty (othercaps)) {
/* no transform possible, we certainly can't proxy */
GST_DEBUG_OBJECT (trans, "can't find transform, disable proxy");
priv->proxy_alloc = FALSE;
} else {
/* we transformed into something */
if (gst_caps_is_equal (sink_suggest, othercaps)) {
GST_DEBUG_OBJECT (trans,
"best caps same as input, marking for proxy");
priv->proxy_alloc = TRUE;
} else {
GST_DEBUG_OBJECT (trans,
"best caps different from input, disable proxy");
priv->proxy_alloc = FALSE;
/* Check if the new caps are compatible with our
* sinkpad template caps and if they're not
* we try to come up with any supported caps
*/
if (new_caps) {
const GstCaps *templ;
templ = gst_pad_get_pad_template_caps (pad);
if (!gst_caps_can_intersect (sink_suggest, templ)) {
GstCaps *allowed;
GstCaps *peercaps;
GST_DEBUG_OBJECT (trans,
"Requested pad alloc caps are not supported: %" GST_PTR_FORMAT,
sink_suggest);
/* the requested pad alloc caps are not supported, so let's try
* picking something allowed between the pads (they are linked,
* there must be something) */
allowed = gst_pad_get_allowed_caps (pad);
if (allowed && !gst_caps_is_empty (allowed)) {
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);
gst_caps_unref (peercaps);
}
/* Fixate them to be safe if the subclass didn't do it */
gst_caps_truncate (allowed);
gst_pad_fixate_caps (pad, allowed);
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_PTR_FORMAT, sink_suggest);
} else {
if (allowed)
gst_caps_unref (allowed);
goto not_supported;
}
if (othercaps)
gst_caps_unref (othercaps);
}
}
/* find the best format for the other side here we decide if we will proxy
* the caps or not. */
if (sink_suggest == NULL) {
/* always proxy when the caps are NULL. When this is a new format, see if
* we can proxy it downstream */
GST_DEBUG_OBJECT (trans, "null caps, marking for proxy");
priv->proxy_alloc = TRUE;
} else if (new_caps) {
GstCaps *othercaps;
/* we have a new format, see what we need to proxy to */
othercaps = gst_base_transform_find_transform (trans, pad, sink_suggest);
if (!othercaps || gst_caps_is_empty (othercaps)) {
/* no transform possible, we certainly can't proxy */
GST_DEBUG_OBJECT (trans, "can't find transform, disable proxy");
priv->proxy_alloc = FALSE;
} else {
/* we transformed into something */
if (gst_caps_is_equal (sink_suggest, othercaps)) {
GST_DEBUG_OBJECT (trans, "best caps same as input, marking for proxy");
priv->proxy_alloc = TRUE;
} else {
GST_DEBUG_OBJECT (trans,
"best caps different from input, disable proxy");
priv->proxy_alloc = FALSE;
}
}
if (othercaps)
gst_caps_unref (othercaps);
}
/* remember the new caps */
GST_OBJECT_LOCK (pad);
gst_caps_replace (&priv->sink_alloc, sink_suggest);
@ -2079,9 +2084,7 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
} else {
GST_DEBUG_OBJECT (trans, "received required caps from peer");
}
}
if (suggest) {
} else if (suggest) {
/* there was a custom suggestion, create a buffer of this format and return
* it. Note that this format */
*buf = gst_buffer_new_and_alloc (size_suggest);
@ -2090,6 +2093,9 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
sink_suggest, sink_suggest);
GST_BUFFER_CAPS (*buf) = sink_suggest;
sink_suggest = NULL;
} else {
/* fallback buffer allocation by gst_pad_alloc_buffer() with the
* caps and size provided by the caller */
}
if (sink_suggest)