gstreamer/gst/segmentclip/gstsegmentclip.c

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/* GStreamer
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "gstsegmentclip.h"
static void gst_segment_clip_reset (GstSegmentClip * self);
static GstStateChangeReturn gst_segment_clip_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_segment_clip_sink_chain (GstPad * pad,
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GstObject * parent, GstBuffer * buffer);
static gboolean gst_segment_clip_sink_setcaps (GstSegmentClip * self,
GstCaps * caps);
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static gboolean gst_segment_clip_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstCaps *gst_segment_clip_getcaps (GstSegmentClip * self, GstPad * pad,
GstCaps * filter);
static gboolean gst_segment_clip_query (GstPad * pad, GstObject * parent,
GstQuery * query);
GST_DEBUG_CATEGORY_STATIC (gst_segment_clip_debug);
#define GST_CAT_DEFAULT gst_segment_clip_debug
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static void gst_segment_clip_class_init (GstSegmentClipClass * klass);
static void gst_segment_clip_init (GstSegmentClip * clip,
GstSegmentClipClass * g_class);
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static GstElementClass *parent_class;
/* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
* method to get to the padtemplates */
GType
gst_segment_clip_get_type (void)
{
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static volatile gsize segment_clip_type = 0;
if (g_once_init_enter (&segment_clip_type)) {
GType _type;
_type = g_type_register_static_simple (GST_TYPE_ELEMENT,
"GstSegmentClip", sizeof (GstSegmentClipClass),
(GClassInitFunc) gst_segment_clip_class_init, sizeof (GstSegmentClip),
(GInstanceInitFunc) gst_segment_clip_init, G_TYPE_FLAG_ABSTRACT);
g_once_init_leave (&segment_clip_type, _type);
}
return segment_clip_type;
}
static void
gst_segment_clip_class_init (GstSegmentClipClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
GST_DEBUG_CATEGORY_INIT (gst_segment_clip_debug, "segmentclip", 0,
"segmentclip base class");
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_segment_clip_change_state);
}
static void
gst_segment_clip_init (GstSegmentClip * self, GstSegmentClipClass * g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstPadTemplate *templ;
templ = gst_element_class_get_pad_template (element_class, "sink");
g_assert (templ);
self->sinkpad = gst_pad_new_from_template (templ, "sink");
gst_pad_set_chain_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_segment_clip_sink_chain));
gst_pad_set_event_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_segment_clip_event));
gst_pad_set_query_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_segment_clip_query));
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GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
gst_object_unref (templ);
templ = gst_element_class_get_pad_template (element_class, "src");
g_assert (templ);
self->srcpad = gst_pad_new_from_template (templ, "src");
gst_pad_set_event_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_segment_clip_event));
gst_pad_set_query_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_segment_clip_query));
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
gst_segment_clip_reset (self);
}
static void
gst_segment_clip_reset (GstSegmentClip * self)
{
GstSegmentClipClass *klass = GST_SEGMENT_CLIP_GET_CLASS (self);
GST_DEBUG_OBJECT (self, "Resetting internal state");
gst_segment_init (&self->segment, GST_FORMAT_UNDEFINED);
if (klass->reset)
klass->reset (self);
}
static gboolean
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gst_segment_clip_sink_setcaps (GstSegmentClip * self, GstCaps * caps)
{
GstSegmentClipClass *klass = GST_SEGMENT_CLIP_GET_CLASS (self);
gboolean ret;
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GST_DEBUG_OBJECT (self, "Setting caps: %" GST_PTR_FORMAT, caps);
ret = klass->set_caps (self, caps);
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/* pass along caps* */
if (ret)
ret = gst_pad_set_caps (self->srcpad, caps);
return ret;
}
static GstCaps *
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gst_segment_clip_getcaps (GstSegmentClip * self, GstPad * pad, GstCaps * filter)
{
GstPad *otherpad;
GstCaps *tmp, *ret;
otherpad = (pad == self->srcpad) ? self->sinkpad : self->srcpad;
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tmp = gst_pad_peer_query_caps (otherpad, filter);
if (tmp) {
ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad));
gst_caps_unref (tmp);
} else {
ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
return ret;
}
static gboolean
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gst_segment_clip_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
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GstSegmentClip *self = GST_SEGMENT_CLIP (parent);
gboolean ret;
GST_LOG_OBJECT (pad, "Handling query of type '%s'",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
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if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) {
GstCaps *caps;
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gst_query_parse_caps (query, &caps);
caps = gst_segment_clip_getcaps (self, pad, caps);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
ret = TRUE;
} else {
ret = gst_pad_query_default (pad, parent, query);
}
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return ret;
}
static GstFlowReturn
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gst_segment_clip_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
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GstSegmentClip *self = GST_SEGMENT_CLIP (parent);
GstFlowReturn ret;
GstSegmentClipClass *klass = GST_SEGMENT_CLIP_GET_CLASS (self);
GstBuffer *outbuf = NULL;
GST_LOG_OBJECT (pad,
"Handling buffer with timestamp %" GST_TIME_FORMAT " and duration %"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
ret = klass->clip_buffer (self, buffer, &outbuf);
if (ret == GST_FLOW_OK && outbuf)
ret = gst_pad_push (self->srcpad, outbuf);
return ret;
}
static GstStateChangeReturn
gst_segment_clip_change_state (GstElement * element, GstStateChange transition)
{
GstSegmentClip *self = GST_SEGMENT_CLIP (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
if (GST_ELEMENT_CLASS (parent_class)->change_state)
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_segment_clip_reset (self);
break;
default:
break;
}
return ret;
}
static gboolean
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gst_segment_clip_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
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GstSegmentClip *self = GST_SEGMENT_CLIP (parent);
gboolean ret = TRUE;
GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
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switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
/* should be only downstream */
g_assert (pad == self->sinkpad);
gst_event_parse_caps (event, &caps);
ret = gst_segment_clip_sink_setcaps (self, caps);
break;
}
case GST_EVENT_SEGMENT:
{
const GstSegment *segment;
gst_event_parse_segment (event, &segment);
GST_DEBUG_OBJECT (pad, "Got NEWSEGMENT event %" GST_SEGMENT_FORMAT,
segment);
gst_segment_copy_into (segment, &self->segment);
break;
}
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case GST_EVENT_FLUSH_STOP:
gst_segment_clip_reset (self);
break;
default:
break;
}
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if (ret)
ret = gst_pad_event_default (pad, parent, event);
else
gst_event_unref (event);
return ret;
}