gstreamer/gst/gdp/gstgdpdepay.c

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/* GStreamer
* Copyright (C) 2006 Thomas Vander Stichele <thomas at apestaart dot org>
*
* 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.
*/
/**
* SECTION:element-gdpdepay
* @see_also: videorate, ffmpegcolorspace
*
* <refsect2>
* <para>
* This element depayloads GStreamer Data Protocol buffers back to deserialized
* buffers and events.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/dataprotocol/dataprotocol.h>
#include "gstgdpdepay.h"
/* elementfactory information */
static const GstElementDetails gdp_depay_details =
GST_ELEMENT_DETAILS ("GDP Depayloader",
"Filter/Effect/Video",
"Depayloads GStreamer Data Protocol buffers",
"Thomas Vander Stichele <thomas at apestaart dot org>");
enum
{
PROP_0,
/* FILL ME */
};
static GstStaticPadTemplate gdp_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-gdp"));
static GstStaticPadTemplate gdp_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY (gst_gdp_depay_debug);
#define GST_CAT_DEFAULT gst_gdp_depay_debug
#define _do_init(x) \
GST_DEBUG_CATEGORY_INIT (gst_gdp_depay_debug, "gdpdepay", 0, \
"GDP depayloader");
GST_BOILERPLATE_FULL (GstGDPDepay, gst_gdp_depay, GstElement,
GST_TYPE_ELEMENT, _do_init);
static GstFlowReturn gst_gdp_depay_chain (GstPad * pad, GstBuffer * buffer);
static GstStateChangeReturn gst_gdp_depay_change_state (GstElement *
element, GstStateChange transition);
static void gst_gdp_depay_finalize (GObject * object);
static void
gst_gdp_depay_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gdp_depay_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gdp_depay_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gdp_depay_src_template));
}
static void
gst_gdp_depay_class_init (GstGDPDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_gdp_depay_change_state);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_gdp_depay_finalize);
}
static void
gst_gdp_depay_init (GstGDPDepay * gdpdepay, GstGDPDepayClass * g_class)
{
gdpdepay->sinkpad =
gst_pad_new_from_static_template (&gdp_depay_sink_template, "sink");
gst_pad_set_setcaps_function (gdpdepay->sinkpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_setcaps));
gst_pad_set_getcaps_function (gdpdepay->sinkpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
gst_pad_set_chain_function (gdpdepay->sinkpad,
GST_DEBUG_FUNCPTR (gst_gdp_depay_chain));
gst_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->sinkpad);
gdpdepay->srcpad =
gst_pad_new_from_static_template (&gdp_depay_src_template, "src");
gst_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->srcpad);
/* our caps will always be decided by the incoming GDP caps buffers */
gst_pad_use_fixed_caps (gdpdepay->srcpad);
gdpdepay->adapter = gst_adapter_new ();
}
static void
gst_gdp_depay_finalize (GObject * gobject)
{
GstGDPDepay *this;
this = GST_GDP_DEPAY (gobject);
if (this->caps)
gst_caps_unref (this->caps);
if (this->header)
g_free (this->header);
gst_adapter_clear (this->adapter);
g_object_unref (this->adapter);
GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (gobject));
}
static GstFlowReturn
gst_gdp_depay_chain (GstPad * pad, GstBuffer * buffer)
{
GstGDPDepay *this;
GstFlowReturn ret = GST_FLOW_OK;
GstCaps *caps;
GstBuffer *buf;
GstEvent *event;
guint8 *header = NULL;
guint8 *payload = NULL;
guint available;
gboolean running = TRUE;
this = GST_GDP_DEPAY (gst_pad_get_parent (pad));
gst_adapter_push (this->adapter, buffer);
while (running) {
switch (this->state) {
case GST_GDP_DEPAY_STATE_HEADER:
available = gst_adapter_available (this->adapter);
if (available < GST_DP_HEADER_LENGTH) {
running = FALSE;
break;
}
if (this->header)
g_free (this->header);
GST_LOG_OBJECT (this, "reading GDP header from adapter");
header = gst_adapter_take (this->adapter, GST_DP_HEADER_LENGTH);
if (!gst_dp_validate_header (GST_DP_HEADER_LENGTH, header))
goto header_validate_error;
this->payload_length = gst_dp_header_payload_length (header);
this->payload_type = gst_dp_header_payload_type (header);
this->header = header;
GST_LOG_OBJECT (this,
"read GDP header, payload size %d, switching to state PAYLOAD",
this->payload_length);
this->state = GST_GDP_DEPAY_STATE_PAYLOAD;
break;
case GST_GDP_DEPAY_STATE_PAYLOAD:
available = gst_adapter_available (this->adapter);
if (available < this->payload_length) {
running = FALSE;
break;
}
/* change state based on type */
if (this->payload_type == GST_DP_PAYLOAD_BUFFER) {
GST_LOG_OBJECT (this, "switching to state BUFFER");
this->state = GST_GDP_DEPAY_STATE_BUFFER;
} else if (this->payload_type == GST_DP_PAYLOAD_CAPS) {
GST_LOG_OBJECT (this, "switching to state CAPS");
this->state = GST_GDP_DEPAY_STATE_CAPS;
} else if (this->payload_type >= GST_DP_PAYLOAD_EVENT_NONE) {
GST_LOG_OBJECT (this, "switching to state EVENT");
this->state = GST_GDP_DEPAY_STATE_EVENT;
} else
goto wrong_type;
break;
case GST_GDP_DEPAY_STATE_BUFFER:
if (!this->caps) {
GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
("Received a buffer without first receiving caps"));
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
GST_LOG_OBJECT (this, "reading GDP buffer from adapter");
buf = gst_dp_buffer_from_header (GST_DP_HEADER_LENGTH, this->header);
payload = gst_adapter_take (this->adapter, this->payload_length);
memcpy (GST_BUFFER_DATA (buf), payload, this->payload_length);
g_free (payload);
gst_buffer_set_caps (buf, this->caps);
ret = gst_pad_push (this->srcpad, buf);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (this, "pushing depayloaded buffer returned %d",
ret);
goto done;
}
GST_LOG_OBJECT (this, "switching to state HEADER");
this->state = GST_GDP_DEPAY_STATE_HEADER;
break;
case GST_GDP_DEPAY_STATE_CAPS:
GST_LOG_OBJECT (this, "reading GDP caps from adapter");
payload = gst_adapter_take (this->adapter, this->payload_length);
caps = gst_dp_caps_from_packet (GST_DP_HEADER_LENGTH, this->header,
payload);
g_free (payload);
GST_DEBUG_OBJECT (this, "read caps %" GST_PTR_FORMAT, caps);
gst_caps_replace (&(this->caps), caps);
gst_pad_set_caps (this->srcpad, caps);
/* drop the creation ref we still have */
gst_caps_unref (caps);
GST_LOG_OBJECT (this, "switching to state HEADER");
this->state = GST_GDP_DEPAY_STATE_HEADER;
break;
case GST_GDP_DEPAY_STATE_EVENT:
GST_LOG_OBJECT (this, "reading GDP event from adapter");
/* adapter doesn't like 0 length payload */
if (this->payload_length > 0)
payload = gst_adapter_take (this->adapter, this->payload_length);
event = gst_dp_event_from_packet (GST_DP_HEADER_LENGTH, this->header,
payload);
/* FIXME: set me as source ? */
gst_pad_push_event (this->srcpad, event);
GST_LOG_OBJECT (this, "switching to state HEADER");
this->state = GST_GDP_DEPAY_STATE_HEADER;
break;
}
}
goto done;
header_validate_error:
GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
("GDP packet header does not validate"));
g_free (header);
ret = GST_FLOW_ERROR;
goto done;
wrong_type:
GST_ELEMENT_ERROR (this, STREAM, DECODE, (NULL),
("GDP packet header is of wrong type"));
g_free (header);
ret = GST_FLOW_ERROR;
goto done;
done:
gst_object_unref (this);
return ret;
}
static GstStateChangeReturn
gst_gdp_depay_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstGDPDepay *this = GST_GDP_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
if (this->caps) {
gst_caps_unref (this->caps);
this->caps = NULL;
}
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return ret;
}
gboolean
gst_gdp_depay_plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "gdpdepay", GST_RANK_NONE,
GST_TYPE_GDP_DEPAY))
return FALSE;
return TRUE;
}