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Original commit message from CVS: * docs/plugins/Makefile.am: * docs/plugins/gst-plugins-bad-plugins-docs.sgml: * docs/plugins/gst-plugins-bad-plugins-sections.txt: add more plugins and elements to docs * gst/gdp/gstgdpdepay.c: (gst_gdp_depay_chain): fix segfaults due to wrong g_free add example * gst/gdp/gstgdppay.c: add example
356 lines
11 KiB
C
356 lines
11 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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* <refsect2>
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* <para>
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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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* </para>
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* <para>
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* <programlisting>
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* gst-launch -v -m filesrc location=test.gdp ! gdpdepay ! xvimagesink
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* </programlisting>
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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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* </para>
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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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/* elementfactory information */
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static const GstElementDetails gdp_depay_details =
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GST_ELEMENT_DETAILS ("GDP Depayloader",
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"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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enum
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{
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PROP_0,
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/* FILL ME */
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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(x) \
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GST_DEBUG_CATEGORY_INIT (gst_gdp_depay_debug, "gdpdepay", 0, \
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"GDP depayloader");
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GST_BOILERPLATE_FULL (GstGDPDepay, gst_gdp_depay, GstElement,
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GST_TYPE_ELEMENT, _do_init);
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static GstFlowReturn gst_gdp_depay_chain (GstPad * pad, 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_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details (element_class, &gdp_depay_details);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gdp_depay_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gdp_depay_src_template));
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}
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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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parent_class = g_type_class_peek_parent (klass);
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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_DEBUG_FUNCPTR (gst_gdp_depay_finalize);
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}
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static void
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gst_gdp_depay_init (GstGDPDepay * gdpdepay, GstGDPDepayClass * g_class)
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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_setcaps_function (gdpdepay->sinkpad,
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GST_DEBUG_FUNCPTR (gst_pad_proxy_setcaps));
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gst_pad_set_getcaps_function (gdpdepay->sinkpad,
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GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
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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_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_element_add_pad (GST_ELEMENT (gdpdepay), gdpdepay->srcpad);
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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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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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if (this->header)
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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 GstFlowReturn
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gst_gdp_depay_chain (GstPad * pad, 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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guint8 *header = NULL;
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guint8 *payload = NULL;
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guint available;
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gboolean running = TRUE;
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this = GST_GDP_DEPAY (gst_pad_get_parent (pad));
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gst_adapter_push (this->adapter, buffer);
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while (running) {
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switch (this->state) {
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case GST_GDP_DEPAY_STATE_HEADER:
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available = gst_adapter_available (this->adapter);
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if (available < GST_DP_HEADER_LENGTH) {
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running = FALSE;
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break;
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}
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if (this->header)
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g_free (this->header);
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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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goto header_validate_error;
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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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this->header = header;
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GST_LOG_OBJECT (this,
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"read GDP header, payload size %d, switching to state PAYLOAD",
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this->payload_length);
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this->state = GST_GDP_DEPAY_STATE_PAYLOAD;
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break;
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case GST_GDP_DEPAY_STATE_PAYLOAD:
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available = gst_adapter_available (this->adapter);
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if (available < this->payload_length) {
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running = FALSE;
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break;
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}
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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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break;
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case GST_GDP_DEPAY_STATE_BUFFER:
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if (!this->caps) {
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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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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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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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payload = gst_adapter_take (this->adapter, this->payload_length);
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memcpy (GST_BUFFER_DATA (buf), payload, this->payload_length);
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g_free (payload);
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payload = NULL;
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gst_buffer_set_caps (buf, this->caps);
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ret = gst_pad_push (this->srcpad, buf);
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if (ret != GST_FLOW_OK) {
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GST_WARNING_OBJECT (this, "pushing depayloaded buffer returned %d",
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ret);
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goto done;
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}
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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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case GST_GDP_DEPAY_STATE_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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payload = NULL;
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if (!caps) {
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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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GST_DEBUG_OBJECT (this, "read 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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case GST_GDP_DEPAY_STATE_EVENT:
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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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event = gst_dp_event_from_packet (GST_DP_HEADER_LENGTH, this->header,
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payload);
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if (payload) {
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g_free (payload);
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payload = NULL;
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}
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if (!event) {
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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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/* FIXME: set me as source ? */
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GST_DEBUG_OBJECT (this, "sending deserialized event %p of type %s",
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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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goto done;
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header_validate_error:
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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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g_free (header);
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ret = GST_FLOW_ERROR;
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goto done;
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wrong_type:
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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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g_free (header);
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ret = GST_FLOW_ERROR;
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goto done;
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done:
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gst_object_unref (this);
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return ret;
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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_READY_TO_NULL:
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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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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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