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479 lines
14 KiB
C
479 lines
14 KiB
C
/* GStreamer
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* Copyright (C) 2006 Thomas Vander Stichele <thomas at apestaart dot org>
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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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/**
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* SECTION:element-gdpdepay
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* @see_also: gdppay
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*
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* This element depayloads GStreamer Data Protocol buffers back to deserialized
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* buffers and events.
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*
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* <refsect2>
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* |[
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* gst-launch -v -m filesrc location=test.gdp ! gdpdepay ! xvimagesink
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* ]| This pipeline plays back a serialized video stream as created in the
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* example for gdppay.
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* </refsect2>
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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 <string.h>
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#include <gst/dataprotocol/dataprotocol.h>
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#include "gstgdpdepay.h"
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enum
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{
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PROP_0,
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};
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static GstStaticPadTemplate gdp_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-gdp"));
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static GstStaticPadTemplate gdp_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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GST_DEBUG_CATEGORY_STATIC (gst_gdp_depay_debug);
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#define GST_CAT_DEFAULT gst_gdp_depay_debug
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#define _do_init \
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GST_DEBUG_CATEGORY_INIT (gst_gdp_depay_debug, "gdpdepay", 0, \
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"GDP depayloader");
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#define gst_gdp_depay_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstGDPDepay, gst_gdp_depay,
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GST_TYPE_ELEMENT, _do_init);
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static gboolean gst_gdp_depay_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static gboolean gst_gdp_depay_src_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_gdp_depay_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buffer);
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static GstStateChangeReturn gst_gdp_depay_change_state (GstElement *
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element, GstStateChange transition);
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static void gst_gdp_depay_finalize (GObject * object);
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static void
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gst_gdp_depay_class_init (GstGDPDepayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gst_element_class_set_details_simple (gstelement_class,
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"GDP Depayloader", "GDP/Depayloader",
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"Depayloads GStreamer Data Protocol buffers",
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"Thomas Vander Stichele <thomas at apestaart dot org>");
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gdp_depay_sink_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gdp_depay_src_template));
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_gdp_depay_change_state);
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gobject_class->finalize = gst_gdp_depay_finalize;
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}
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static void
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gst_gdp_depay_init (GstGDPDepay * gdpdepay)
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{
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gdpdepay->sinkpad =
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gst_pad_new_from_static_template (&gdp_depay_sink_template, "sink");
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gst_pad_set_chain_function (gdpdepay->sinkpad,
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GST_DEBUG_FUNCPTR (gst_gdp_depay_chain));
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gst_pad_set_event_function (gdpdepay->sinkpad,
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GST_DEBUG_FUNCPTR (gst_gdp_depay_sink_event));
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gst_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->sinkpad);
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gdpdepay->srcpad =
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gst_pad_new_from_static_template (&gdp_depay_src_template, "src");
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gst_pad_set_event_function (gdpdepay->srcpad,
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GST_DEBUG_FUNCPTR (gst_gdp_depay_src_event));
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/* our caps will always be decided by the incoming GDP caps buffers */
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gst_pad_use_fixed_caps (gdpdepay->srcpad);
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gst_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->srcpad);
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gdpdepay->adapter = gst_adapter_new ();
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}
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static void
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gst_gdp_depay_finalize (GObject * gobject)
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{
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GstGDPDepay *this;
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this = GST_GDP_DEPAY (gobject);
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if (this->caps)
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gst_caps_unref (this->caps);
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g_free (this->header);
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gst_adapter_clear (this->adapter);
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g_object_unref (this->adapter);
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GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (gobject));
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}
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static gboolean
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gst_gdp_depay_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstGDPDepay *this;
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gboolean res = TRUE;
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this = GST_GDP_DEPAY (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_START:
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/* forward flush start */
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res = gst_pad_push_event (this->srcpad, event);
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break;
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case GST_EVENT_FLUSH_STOP:
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/* clear adapter on flush */
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gst_adapter_clear (this->adapter);
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/* forward flush stop */
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res = gst_pad_push_event (this->srcpad, event);
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break;
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case GST_EVENT_EOS:
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/* after EOS, we don't expect to output anything anymore */
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res = gst_pad_push_event (this->srcpad, event);
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break;
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case GST_EVENT_SEGMENT:
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case GST_EVENT_TAG:
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case GST_EVENT_BUFFERSIZE:
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default:
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/* we unref most events as we take them from the datastream */
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gst_event_unref (event);
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break;
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}
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return res;
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}
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static gboolean
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gst_gdp_depay_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstGDPDepay *this;
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gboolean res = TRUE;
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this = GST_GDP_DEPAY (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_SEEK:
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/* we refuse seek for now. */
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gst_event_unref (event);
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res = FALSE;
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break;
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case GST_EVENT_QOS:
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case GST_EVENT_NAVIGATION:
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default:
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/* everything else is passed */
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res = gst_pad_push_event (this->sinkpad, event);
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break;
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}
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return res;
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}
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static GstFlowReturn
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gst_gdp_depay_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
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{
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GstGDPDepay *this;
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GstFlowReturn ret = GST_FLOW_OK;
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GstCaps *caps;
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GstBuffer *buf;
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GstEvent *event;
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guint available;
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this = GST_GDP_DEPAY (parent);
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/* On DISCONT, get rid of accumulated data. We assume a buffer after the
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* DISCONT contains (part of) a new valid header, if not we error because we
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* lost sync */
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if (GST_BUFFER_IS_DISCONT (buffer)) {
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gst_adapter_clear (this->adapter);
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this->state = GST_GDP_DEPAY_STATE_HEADER;
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}
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gst_adapter_push (this->adapter, buffer);
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while (TRUE) {
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switch (this->state) {
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case GST_GDP_DEPAY_STATE_HEADER:
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{
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guint8 *header;
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/* collect a complete header, validate and store the header. Figure out
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* the payload length and switch to the PAYLOAD state */
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available = gst_adapter_available (this->adapter);
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if (available < GST_DP_HEADER_LENGTH)
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goto done;
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GST_LOG_OBJECT (this, "reading GDP header from adapter");
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header = gst_adapter_take (this->adapter, GST_DP_HEADER_LENGTH);
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if (!gst_dp_validate_header (GST_DP_HEADER_LENGTH, header)) {
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g_free (header);
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goto header_validate_error;
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}
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/* store types and payload length. Also store the header, which we need
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* to make the payload. */
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this->payload_length = gst_dp_header_payload_length (header);
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this->payload_type = gst_dp_header_payload_type (header);
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/* free previous header and store new one. */
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g_free (this->header);
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this->header = header;
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GST_LOG_OBJECT (this,
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"read GDP header, payload size %d, payload type %d, switching to state PAYLOAD",
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this->payload_length, this->payload_type);
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this->state = GST_GDP_DEPAY_STATE_PAYLOAD;
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break;
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}
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case GST_GDP_DEPAY_STATE_PAYLOAD:
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{
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/* in this state we wait for all the payload data to be available in the
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* adapter. Then we switch to the state where we actually process the
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* payload. */
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available = gst_adapter_available (this->adapter);
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if (available < this->payload_length)
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goto done;
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/* change state based on type */
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if (this->payload_type == GST_DP_PAYLOAD_BUFFER) {
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GST_LOG_OBJECT (this, "switching to state BUFFER");
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this->state = GST_GDP_DEPAY_STATE_BUFFER;
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} else if (this->payload_type == GST_DP_PAYLOAD_CAPS) {
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GST_LOG_OBJECT (this, "switching to state CAPS");
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this->state = GST_GDP_DEPAY_STATE_CAPS;
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} else if (this->payload_type >= GST_DP_PAYLOAD_EVENT_NONE) {
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GST_LOG_OBJECT (this, "switching to state EVENT");
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this->state = GST_GDP_DEPAY_STATE_EVENT;
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} else {
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goto wrong_type;
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}
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if (this->payload_length) {
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const guint8 *data;
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gboolean res;
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data = gst_adapter_map (this->adapter, this->payload_length);
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res = gst_dp_validate_payload (GST_DP_HEADER_LENGTH, this->header,
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data);
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gst_adapter_unmap (this->adapter);
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if (!res)
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goto payload_validate_error;
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}
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break;
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}
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case GST_GDP_DEPAY_STATE_BUFFER:
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{
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/* if we receive a buffer without caps first, we error out */
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if (!this->caps)
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goto no_caps;
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GST_LOG_OBJECT (this, "reading GDP buffer from adapter");
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buf = gst_dp_buffer_from_header (GST_DP_HEADER_LENGTH, this->header);
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if (!buf)
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goto buffer_failed;
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/* now take the payload if there is any */
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if (this->payload_length > 0) {
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guint8 *payload;
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payload = gst_buffer_map (buf, NULL, NULL, GST_MAP_WRITE);
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gst_adapter_copy (this->adapter, payload, 0, this->payload_length);
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gst_buffer_unmap (buf, payload, this->payload_length);
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gst_adapter_flush (this->adapter, this->payload_length);
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}
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/* set caps and push */
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GST_LOG_OBJECT (this, "deserialized buffer %p, pushing, timestamp %"
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GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
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", offset %" G_GINT64_FORMAT ", offset_end %" G_GINT64_FORMAT
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", size %" G_GSIZE_FORMAT ", flags 0x%x",
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buf,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
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GST_TIME_ARGS (GST_BUFFER_DURATION (buf)),
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GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf),
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gst_buffer_get_size (buf), GST_BUFFER_FLAGS (buf));
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ret = gst_pad_push (this->srcpad, buf);
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if (ret != GST_FLOW_OK)
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goto push_error;
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GST_LOG_OBJECT (this, "switching to state HEADER");
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this->state = GST_GDP_DEPAY_STATE_HEADER;
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break;
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}
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case GST_GDP_DEPAY_STATE_CAPS:
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{
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guint8 *payload;
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/* take the payload of the caps */
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GST_LOG_OBJECT (this, "reading GDP caps from adapter");
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payload = gst_adapter_take (this->adapter, this->payload_length);
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caps = gst_dp_caps_from_packet (GST_DP_HEADER_LENGTH, this->header,
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payload);
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g_free (payload);
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if (!caps)
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goto caps_failed;
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GST_DEBUG_OBJECT (this, "deserialized caps %" GST_PTR_FORMAT, caps);
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gst_caps_replace (&(this->caps), caps);
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gst_pad_set_caps (this->srcpad, caps);
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/* drop the creation ref we still have */
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gst_caps_unref (caps);
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GST_LOG_OBJECT (this, "switching to state HEADER");
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this->state = GST_GDP_DEPAY_STATE_HEADER;
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break;
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}
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case GST_GDP_DEPAY_STATE_EVENT:
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{
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guint8 *payload;
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GST_LOG_OBJECT (this, "reading GDP event from adapter");
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/* adapter doesn't like 0 length payload */
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if (this->payload_length > 0)
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payload = gst_adapter_take (this->adapter, this->payload_length);
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else
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payload = NULL;
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event = gst_dp_event_from_packet (GST_DP_HEADER_LENGTH, this->header,
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payload);
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g_free (payload);
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if (!event)
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goto event_failed;
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GST_DEBUG_OBJECT (this, "deserialized event %p of type %s, pushing",
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event, gst_event_type_get_name (event->type));
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gst_pad_push_event (this->srcpad, event);
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GST_LOG_OBJECT (this, "switching to state HEADER");
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this->state = GST_GDP_DEPAY_STATE_HEADER;
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break;
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}
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}
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}
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done:
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return ret;
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/* ERRORS */
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header_validate_error:
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{
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GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
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("GDP packet header does not validate"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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payload_validate_error:
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{
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GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
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("GDP packet payload does not validate"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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wrong_type:
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{
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GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
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("GDP packet header is of wrong type"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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no_caps:
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{
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GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
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("Received a buffer without first receiving caps"));
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ret = GST_FLOW_NOT_NEGOTIATED;
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goto done;
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}
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buffer_failed:
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{
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GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
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("could not create buffer from GDP packet"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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push_error:
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{
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GST_WARNING_OBJECT (this, "pushing depayloaded buffer returned %d", ret);
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goto done;
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}
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caps_failed:
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{
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GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
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("could not create caps from GDP packet"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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event_failed:
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{
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GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
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("could not create event from GDP packet"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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}
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static GstStateChangeReturn
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gst_gdp_depay_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstGDPDepay *this = GST_GDP_DEPAY (element);
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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_PAUSED_TO_READY:
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if (this->caps) {
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gst_caps_unref (this->caps);
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this->caps = NULL;
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}
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gst_adapter_clear (this->adapter);
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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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gboolean
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gst_gdp_depay_plugin_init (GstPlugin * plugin)
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{
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if (!gst_element_register (plugin, "gdpdepay", GST_RANK_NONE,
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GST_TYPE_GDP_DEPAY))
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return FALSE;
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return TRUE;
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}
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