gstreamer/gst/gdp/gstgdpdepay.c
2012-09-11 01:54:36 +01:00

479 lines
14 KiB
C

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