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basetransform: add vmethod to configure upstream bufferpool

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Add a vmethod that can be implemented to influence the bufferpool that upstream
elements will use.
This commit is contained in:
Wim Taymans 2011-08-26 11:44:12 +02:00
parent f1566e85c0
commit b91a5ab60a
2 changed files with 26 additions and 13 deletions
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21
libs/gst/base/gstbasetransform.c
View file

@ -1324,12 +1324,23 @@ gst_base_transform_default_query (GstBaseTransform * trans,
passthrough = trans->passthrough || trans->always_in_place;
GST_BASE_TRANSFORM_UNLOCK (trans);
GST_DEBUG_OBJECT (trans, "passthrough %d", passthrough);
if (passthrough)
if (passthrough) {
GST_DEBUG_OBJECT (trans, "doing passthrough query");
ret = gst_pad_peer_query (otherpad, query);
else
ret = FALSE;
} else {
GstBaseTransformClass *klass;
GST_DEBUG_OBJECT (trans, "deciding on allocation values");
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* pass the query to the decide_allocation vmethod if any */
if (G_LIKELY (klass->decide_allocation))
ret = klass->decide_allocation (trans, query);
else
ret = FALSE;
}
GST_DEBUG_OBJECT (trans, "ALLOCATION ret %d, %" GST_PTR_FORMAT, ret,
query);
break;
}
case GST_QUERY_POSITION:

18
libs/gst/base/gstbasetransform.h
View file

@ -162,11 +162,13 @@ struct _GstBaseTransform {
* query
* @decide_allocation: Decide what parameters you want upstream elements to use
* for the allocation of buffers. This function is only
* called when not operating in passthrough mode.
* called when not operating in passthrough mode. The
* default implementation is NULL.
* @setup_allocation: Setup the allocation parameters for allocating output
* buffers. The passed in query contains the result of the
* downstream allocation query. This function is only called
* when not operating in passthrough mode.
* when not operating in passthrough mode. The default
* implementation is NULL.
* @transform_size: Optional. Given the size of a buffer in the given direction
* with the given caps, calculate the size in bytes of a buffer
* on the other pad with the given other caps.
@ -180,12 +182,6 @@ struct _GstBaseTransform {
* @stop: Optional.
* Called when the element stops processing.
* Allows closing external resources.
* @transform: Required if the element does not operate in-place.
* Transforms one incoming buffer to one outgoing buffer.
* The function is allowed to change size/timestamp/duration
* of the outgoing buffer.
* @transform_ip: Required if the element operates in-place.
* Transform the incoming buffer in-place.
* @sink_event: Optional.
* Event handler on the sink pad. The default implementation
* handles the event and forwards it downstream.
@ -209,6 +205,12 @@ struct _GstBaseTransform {
* This method is called right before the base class will
* start processing. Dynamic properties or other delayed
* configuration could be performed in this method.
* @transform: Required if the element does not operate in-place.
* Transforms one incoming buffer to one outgoing buffer.
* The function is allowed to change size/timestamp/duration
* of the outgoing buffer.
* @transform_ip: Required if the element operates in-place.
* Transform the incoming buffer in-place.
*
* Subclasses can override any of the available virtual methods or not, as
* needed. At minimum either @transform or @transform_ip need to be overridden.