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/* vim: set filetype=c: */
% ClassName
GstBaseTransform
% TYPE_CLASS_NAME
GST_TYPE_BASE_TRANSFORM
% pads
srcpad-simple
sinkpad-simple
% pkg-config
gstreamer-base-1.0
% includes
#include <gst/base/gstbasetransform.h>
% prototypes
static GstCaps *gst_replace_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static GstCaps *gst_replace_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static gboolean gst_replace_accept_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps);
static gboolean gst_replace_set_caps (GstBaseTransform * trans,
GstCaps * incaps, GstCaps * outcaps);
static gboolean gst_replace_query (GstBaseTransform * trans,
GstPadDirection direction, GstQuery * query);
static gboolean gst_replace_decide_allocation (GstBaseTransform * trans,
GstQuery * query);
static gboolean gst_replace_filter_meta (GstBaseTransform * trans,
GstQuery * query, GType api, const GstStructure * params);
static gboolean gst_replace_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query);
static gboolean gst_replace_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, gsize size, GstCaps * othercaps,
gsize * othersize);
static gboolean gst_replace_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, gsize * size);
static gboolean gst_replace_start (GstBaseTransform * trans);
static gboolean gst_replace_stop (GstBaseTransform * trans);
static gboolean gst_replace_sink_event (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_replace_src_event (GstBaseTransform * trans,
GstEvent * event);
static GstFlowReturn gst_replace_prepare_output_buffer (GstBaseTransform *
trans, GstBuffer * input, GstBuffer ** outbuf);
static gboolean gst_replace_copy_metadata (GstBaseTransform * trans,
GstBuffer * input, GstBuffer * outbuf);
static gboolean gst_replace_transform_meta (GstBaseTransform * trans,
GstBuffer * outbuf, GstMeta * meta, GstBuffer * inbuf);
static void gst_replace_before_transform (GstBaseTransform * trans,
GstBuffer * buffer);
static GstFlowReturn gst_replace_transform (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf);
static GstFlowReturn gst_replace_transform_ip (GstBaseTransform * trans,
GstBuffer * buf);
% declare-class
GstBaseTransformClass *base_transform_class = GST_BASE_TRANSFORM_CLASS (klass);
% set-methods
base_transform_class->transform_caps = GST_DEBUG_FUNCPTR (gst_replace_transform_caps);
base_transform_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_replace_fixate_caps);
base_transform_class->accept_caps = GST_DEBUG_FUNCPTR (gst_replace_accept_caps);
base_transform_class->set_caps = GST_DEBUG_FUNCPTR (gst_replace_set_caps);
base_transform_class->query = GST_DEBUG_FUNCPTR (gst_replace_query);
base_transform_class->decide_allocation = GST_DEBUG_FUNCPTR (gst_replace_decide_allocation);
base_transform_class->filter_meta = GST_DEBUG_FUNCPTR (gst_replace_filter_meta);
base_transform_class->propose_allocation = GST_DEBUG_FUNCPTR (gst_replace_propose_allocation);
base_transform_class->transform_size = GST_DEBUG_FUNCPTR (gst_replace_transform_size);
base_transform_class->get_unit_size = GST_DEBUG_FUNCPTR (gst_replace_get_unit_size);
base_transform_class->start = GST_DEBUG_FUNCPTR (gst_replace_start);
base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_replace_stop);
base_transform_class->sink_event = GST_DEBUG_FUNCPTR (gst_replace_sink_event);
base_transform_class->src_event = GST_DEBUG_FUNCPTR (gst_replace_src_event);
base_transform_class->prepare_output_buffer = GST_DEBUG_FUNCPTR (gst_replace_prepare_output_buffer);
base_transform_class->copy_metadata = GST_DEBUG_FUNCPTR (gst_replace_copy_metadata);
base_transform_class->transform_meta = GST_DEBUG_FUNCPTR (gst_replace_transform_meta);
base_transform_class->before_transform = GST_DEBUG_FUNCPTR (gst_replace_before_transform);
base_transform_class->transform = GST_DEBUG_FUNCPTR (gst_replace_transform);
base_transform_class->transform_ip = GST_DEBUG_FUNCPTR (gst_replace_transform_ip);
% methods
static GstCaps *
gst_replace_transform_caps (GstBaseTransform * trans, GstPadDirection direction,
GstCaps * caps, GstCaps * filter)
{
GstReplace *replace = GST_REPLACE (trans);
GstCaps *othercaps;
GST_DEBUG_OBJECT (replace, "transform_caps");
othercaps = gst_caps_copy (caps);
/* Copy other caps and modify as appropriate */
/* This works for the simplest cases, where the transform modifies one
* or more fields in the caps structure. It does not work correctly
* if passthrough caps are preferred. */
if (direction == GST_PAD_SRC) {
/* transform caps going upstream */
} else {
/* transform caps going downstream */
}
if (filter) {
GstCaps *intersect;
intersect = gst_caps_intersect (othercaps, filter);
gst_caps_unref (othercaps);
return intersect;
} else {
return othercaps;
}
}
static GstCaps *
gst_replace_fixate_caps (GstBaseTransform * trans, GstPadDirection direction,
GstCaps * caps, GstCaps * othercaps)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "fixate_caps");
return NULL;
}
static gboolean
gst_replace_accept_caps (GstBaseTransform * trans, GstPadDirection direction,
GstCaps * caps)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "accept_caps");
return TRUE;
}
static gboolean
gst_replace_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "set_caps");
return TRUE;
}
static gboolean
gst_replace_query (GstBaseTransform * trans, GstPadDirection direction,
GstQuery * query)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "query");
return TRUE;
}
/* decide allocation query for output buffers */
static gboolean
gst_replace_decide_allocation (GstBaseTransform * trans, GstQuery * query)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "decide_allocation");
return TRUE;
}
static gboolean
gst_replace_filter_meta (GstBaseTransform * trans, GstQuery * query, GType api,
const GstStructure * params)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "filter_meta");
return TRUE;
}
/* propose allocation query parameters for input buffers */
static gboolean
gst_replace_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "propose_allocation");
return TRUE;
}
/* transform size */
static gboolean
gst_replace_transform_size (GstBaseTransform * trans, GstPadDirection direction,
GstCaps * caps, gsize size, GstCaps * othercaps, gsize * othersize)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "transform_size");
return TRUE;
}
static gboolean
gst_replace_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
gsize * size)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "get_unit_size");
return TRUE;
}
/* states */
static gboolean
gst_replace_start (GstBaseTransform * trans)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "start");
return TRUE;
}
static gboolean
gst_replace_stop (GstBaseTransform * trans)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "stop");
return TRUE;
}
/* sink and src pad event handlers */
static gboolean
gst_replace_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "sink_event");
return GST_BASE_TRANSFORM_CLASS (gst_replace_parent_class)->sink_event (
trans, event);
}
static gboolean
gst_replace_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "src_event");
return GST_BASE_TRANSFORM_CLASS (gst_replace_parent_class)->src_event (
trans, event);
}
static GstFlowReturn
gst_replace_prepare_output_buffer (GstBaseTransform * trans, GstBuffer * input,
GstBuffer ** outbuf)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "prepare_output_buffer");
return GST_FLOW_OK;
}
/* metadata */
static gboolean
gst_replace_copy_metadata (GstBaseTransform * trans, GstBuffer * input,
GstBuffer * outbuf)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "copy_metadata");
return TRUE;
}
static gboolean
gst_replace_transform_meta (GstBaseTransform * trans, GstBuffer * outbuf,
GstMeta * meta, GstBuffer * inbuf)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "transform_meta");
return TRUE;
}
static void
gst_replace_before_transform (GstBaseTransform * trans, GstBuffer * buffer)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "before_transform");
}
/* transform */
static GstFlowReturn
gst_replace_transform (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "transform");
return GST_FLOW_OK;
}
static GstFlowReturn
gst_replace_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstReplace *replace = GST_REPLACE (trans);
GST_DEBUG_OBJECT (replace, "transform_ip");
return GST_FLOW_OK;
}
% end
|
