--- /dev/null
+/* 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(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 gboolean gst_gdp_depay_sink_event (GstPad * pad, GstEvent * event);
+static gboolean gst_gdp_depay_src_event (GstPad * pad, GstEvent * event);
+
+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_simple (element_class,
+ "GDP Depayloader", "GDP/Depayloader",
+ "Depayloads GStreamer Data Protocol buffers",
+ "Thomas Vander Stichele <thomas at apestaart dot org>");
+
+ 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;
+
+ 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, GstGDPDepayClass * g_class)
+{
+ 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, GstEvent * event)
+{
+ GstGDPDepay *this;
+ gboolean res = TRUE;
+
+ this = GST_GDP_DEPAY (gst_pad_get_parent (pad));
+
+ 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_NEWSEGMENT:
+ 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;
+ }
+ gst_object_unref (this);
+
+ return res;
+}
+
+static gboolean
+gst_gdp_depay_src_event (GstPad * pad, GstEvent * event)
+{
+ GstGDPDepay *this;
+ gboolean res = TRUE;
+
+ this = GST_GDP_DEPAY (gst_pad_get_parent (pad));
+
+ 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;
+ }
+ gst_object_unref (this);
+
+ return res;
+}
+
+static GstFlowReturn
+gst_gdp_depay_chain (GstPad * pad, GstBuffer * buffer)
+{
+ GstGDPDepay *this;
+ GstFlowReturn ret = GST_FLOW_OK;
+ GstCaps *caps;
+ GstBuffer *buf;
+ GstEvent *event;
+ guint available;
+
+ this = GST_GDP_DEPAY (gst_pad_get_parent (pad));
+
+ /* 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
+ && (!gst_dp_validate_payload (GST_DP_HEADER_LENGTH, this->header,
+ gst_adapter_peek (this->adapter, this->payload_length)))) {
+ 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_adapter_take (this->adapter, this->payload_length);
+ memcpy (GST_BUFFER_DATA (buf), payload, this->payload_length);
+ g_free (payload);
+ }
+
+ /* set caps and push */
+ gst_buffer_set_caps (buf, this->caps);
+ 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 %d, 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_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:
+ gst_object_unref (this);
+ 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;
+}
projects / mafwsubrenderer / blobdiff