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