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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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496 lines
13 KiB
C
496 lines
13 KiB
C
/* GStreamer
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* Copyright (C) <2006> Lutz Mueller <lutz at topfrose dot de>
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* <2006> Wim Taymans <wim@fluendo.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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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 "gstrdtbuffer.h"
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#include "rdtdepay.h"
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GST_DEBUG_CATEGORY_STATIC (rdtdepay_debug);
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#define GST_CAT_DEFAULT rdtdepay_debug
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/* RDTDepay signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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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 gst_rdt_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 ("application/vnd.rn-realmedia")
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);
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static GstStaticPadTemplate gst_rdt_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-rdt, "
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"media = (string) \"application\", "
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"clock-rate = (int) [1, MAX ], "
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"encoding-name = (string) \"X-REAL-RDT\""
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/* All optional parameters
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*
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* "config="
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*/
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)
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);
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#define gst_rdt_depay_parent_class parent_class
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G_DEFINE_TYPE (GstRDTDepay, gst_rdt_depay, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE (rdtdepay, "rdtdepay",
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GST_RANK_MARGINAL, GST_TYPE_RDT_DEPAY);
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static void gst_rdt_depay_finalize (GObject * object);
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static GstStateChangeReturn gst_rdt_depay_change_state (GstElement *
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element, GstStateChange transition);
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static gboolean gst_rdt_depay_sink_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_rdt_depay_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buf);
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static void
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gst_rdt_depay_class_init (GstRDTDepayClass * 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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gobject_class->finalize = gst_rdt_depay_finalize;
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gstelement_class->change_state = gst_rdt_depay_change_state;
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rdt_depay_src_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rdt_depay_sink_template);
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gst_element_class_set_static_metadata (gstelement_class, "RDT packet parser",
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"Codec/Depayloader/Network",
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"Extracts RealMedia from RDT packets",
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"Lutz Mueller <lutz at topfrose dot de>, "
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"Wim Taymans <wim@fluendo.com>");
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GST_DEBUG_CATEGORY_INIT (rdtdepay_debug, "rdtdepay",
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0, "Depayloader for RDT RealMedia packets");
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}
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static void
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gst_rdt_depay_init (GstRDTDepay * rdtdepay)
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{
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rdtdepay->sinkpad =
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gst_pad_new_from_static_template (&gst_rdt_depay_sink_template, "sink");
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gst_pad_set_chain_function (rdtdepay->sinkpad, gst_rdt_depay_chain);
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gst_pad_set_event_function (rdtdepay->sinkpad, gst_rdt_depay_sink_event);
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gst_element_add_pad (GST_ELEMENT_CAST (rdtdepay), rdtdepay->sinkpad);
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rdtdepay->srcpad =
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gst_pad_new_from_static_template (&gst_rdt_depay_src_template, "src");
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gst_element_add_pad (GST_ELEMENT_CAST (rdtdepay), rdtdepay->srcpad);
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}
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static void
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gst_rdt_depay_finalize (GObject * object)
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{
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GstRDTDepay *rdtdepay;
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rdtdepay = GST_RDT_DEPAY (object);
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if (rdtdepay->header)
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gst_buffer_unref (rdtdepay->header);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_rdt_depay_setcaps (GstPad * pad, GstCaps * caps)
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{
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GstStructure *structure;
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GstRDTDepay *rdtdepay;
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GstCaps *srccaps;
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gint clock_rate = 1000; /* default */
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const GValue *value;
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GstBuffer *header;
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rdtdepay = GST_RDT_DEPAY (GST_PAD_PARENT (pad));
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structure = gst_caps_get_structure (caps, 0);
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if (gst_structure_has_field (structure, "clock-rate"))
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gst_structure_get_int (structure, "clock-rate", &clock_rate);
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/* config contains the RealMedia header as a buffer. */
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value = gst_structure_get_value (structure, "config");
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if (!value)
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goto no_header;
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header = gst_value_get_buffer (value);
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if (!header)
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goto no_header;
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/* get other values for newsegment */
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value = gst_structure_get_value (structure, "npt-start");
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if (value && G_VALUE_HOLDS_UINT64 (value))
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rdtdepay->npt_start = g_value_get_uint64 (value);
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else
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rdtdepay->npt_start = 0;
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GST_DEBUG_OBJECT (rdtdepay, "NPT start %" G_GUINT64_FORMAT,
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rdtdepay->npt_start);
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value = gst_structure_get_value (structure, "npt-stop");
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if (value && G_VALUE_HOLDS_UINT64 (value))
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rdtdepay->npt_stop = g_value_get_uint64 (value);
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else
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rdtdepay->npt_stop = -1;
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GST_DEBUG_OBJECT (rdtdepay, "NPT stop %" G_GUINT64_FORMAT,
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rdtdepay->npt_stop);
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value = gst_structure_get_value (structure, "play-speed");
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if (value && G_VALUE_HOLDS_DOUBLE (value))
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rdtdepay->play_speed = g_value_get_double (value);
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else
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rdtdepay->play_speed = 1.0;
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value = gst_structure_get_value (structure, "play-scale");
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if (value && G_VALUE_HOLDS_DOUBLE (value))
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rdtdepay->play_scale = g_value_get_double (value);
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else
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rdtdepay->play_scale = 1.0;
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/* caps seem good, configure element */
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rdtdepay->clock_rate = clock_rate;
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/* set caps on pad and on header */
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srccaps = gst_caps_new_empty_simple ("application/vnd.rn-realmedia");
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gst_pad_set_caps (rdtdepay->srcpad, srccaps);
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gst_caps_unref (srccaps);
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if (rdtdepay->header)
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gst_buffer_unref (rdtdepay->header);
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rdtdepay->header = gst_buffer_ref (header);
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return TRUE;
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/* ERRORS */
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no_header:
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{
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GST_ERROR_OBJECT (rdtdepay, "no header found in caps, no 'config' field");
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return FALSE;
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}
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}
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static gboolean
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gst_rdt_depay_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstRDTDepay *depay;
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gboolean res = TRUE;
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depay = GST_RDT_DEPAY (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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gst_event_parse_caps (event, &caps);
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res = gst_rdt_depay_setcaps (pad, caps);
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gst_event_unref (event);
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break;
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}
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case GST_EVENT_FLUSH_STOP:
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res = gst_pad_push_event (depay->srcpad, event);
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gst_segment_init (&depay->segment, GST_FORMAT_UNDEFINED);
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depay->need_newsegment = TRUE;
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depay->next_seqnum = -1;
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break;
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case GST_EVENT_SEGMENT:
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{
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gst_event_copy_segment (event, &depay->segment);
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/* don't pass the event downstream, we generate our own segment
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* including the NTP time and other things we receive in caps */
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gst_event_unref (event);
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break;
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}
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default:
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/* pass other events forward */
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res = gst_pad_push_event (depay->srcpad, 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 GstEvent *
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create_segment_event (GstRDTDepay * depay, gboolean update,
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GstClockTime position)
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{
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GstSegment segment;
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gst_segment_init (&segment, GST_FORMAT_TIME);
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segment.rate = depay->play_speed;
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segment.applied_rate = depay->play_scale;
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segment.start = position;
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if (depay->npt_stop != -1)
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segment.stop = depay->npt_stop - depay->npt_start;
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else
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segment.stop = -1;
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segment.time = position + depay->npt_start;
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return gst_event_new_segment (&segment);
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}
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static GstFlowReturn
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gst_rdt_depay_push (GstRDTDepay * rdtdepay, GstBuffer * buffer)
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{
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GstFlowReturn ret;
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if (rdtdepay->need_newsegment) {
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GstEvent *event;
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event = create_segment_event (rdtdepay, FALSE, 0);
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gst_pad_push_event (rdtdepay->srcpad, event);
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rdtdepay->need_newsegment = FALSE;
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}
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if (rdtdepay->discont) {
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GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
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rdtdepay->discont = FALSE;
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}
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ret = gst_pad_push (rdtdepay->srcpad, buffer);
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return ret;
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}
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static GstFlowReturn
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gst_rdt_depay_handle_data (GstRDTDepay * rdtdepay, GstClockTime outtime,
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GstRDTPacket * packet)
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{
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GstFlowReturn ret;
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GstBuffer *outbuf;
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GstMapInfo outmap;
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guint8 *data, *outdata;
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guint size;
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guint16 stream_id;
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guint32 timestamp;
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gint gap;
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guint16 seqnum;
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guint8 flags;
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guint16 outflags;
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/* get pointers to the packet data */
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data = gst_rdt_packet_data_map (packet, &size);
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outbuf = gst_buffer_new_and_alloc (12 + size);
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GST_BUFFER_TIMESTAMP (outbuf) = outtime;
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GST_DEBUG_OBJECT (rdtdepay, "have size %u", size);
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/* copy over some things */
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stream_id = gst_rdt_packet_data_get_stream_id (packet);
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timestamp = gst_rdt_packet_data_get_timestamp (packet);
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flags = gst_rdt_packet_data_get_flags (packet);
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seqnum = gst_rdt_packet_data_get_seq (packet);
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GST_DEBUG_OBJECT (rdtdepay, "stream_id %u, timestamp %u, seqnum %d, flags %d",
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stream_id, timestamp, seqnum, flags);
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if (rdtdepay->next_seqnum != -1) {
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gap = gst_rdt_buffer_compare_seqnum (seqnum, rdtdepay->next_seqnum);
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/* if we have no gap, all is fine */
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if (G_UNLIKELY (gap != 0)) {
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GST_LOG_OBJECT (rdtdepay, "got packet %u, expected %u, gap %d", seqnum,
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rdtdepay->next_seqnum, gap);
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if (gap < 0) {
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/* seqnum > next_seqnum, we are missing some packets, this is always a
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* DISCONT. */
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GST_LOG_OBJECT (rdtdepay, "%d missing packets", gap);
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rdtdepay->discont = TRUE;
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} else {
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/* seqnum < next_seqnum, we have seen this packet before or the sender
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* could be restarted. If the packet is not too old, we throw it away as
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* a duplicate, otherwise we mark discont and continue. 100 misordered
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* packets is a good threshold. See also RFC 4737. */
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if (gap < 100)
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goto dropping;
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GST_LOG_OBJECT (rdtdepay,
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"%d > 100, packet too old, sender likely restarted", gap);
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rdtdepay->discont = TRUE;
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}
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}
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}
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rdtdepay->next_seqnum = (seqnum + 1);
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if (rdtdepay->next_seqnum == 0xff00)
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rdtdepay->next_seqnum = 0;
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if ((flags & 1) == 0)
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outflags = 2;
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else
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outflags = 0;
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gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE);
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outdata = outmap.data;
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GST_WRITE_UINT16_BE (outdata + 0, 0); /* version */
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GST_WRITE_UINT16_BE (outdata + 2, size + 12); /* length */
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GST_WRITE_UINT16_BE (outdata + 4, stream_id); /* stream */
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GST_WRITE_UINT32_BE (outdata + 6, timestamp); /* timestamp */
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GST_WRITE_UINT16_BE (outdata + 10, outflags); /* flags */
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memcpy (outdata + 12, data, size);
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gst_buffer_unmap (outbuf, &outmap);
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gst_buffer_resize (outbuf, 0, 12 + size);
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gst_rdt_packet_data_unmap (packet);
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GST_DEBUG_OBJECT (rdtdepay, "Pushing packet, outtime %" GST_TIME_FORMAT,
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GST_TIME_ARGS (outtime));
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ret = gst_rdt_depay_push (rdtdepay, outbuf);
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return ret;
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/* ERRORS */
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dropping:
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{
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GST_WARNING_OBJECT (rdtdepay, "%d <= 100, dropping old packet", gap);
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return GST_FLOW_OK;
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}
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}
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static GstFlowReturn
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gst_rdt_depay_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
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{
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GstRDTDepay *rdtdepay;
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GstFlowReturn ret;
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GstClockTime timestamp;
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gboolean more;
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GstRDTPacket packet;
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rdtdepay = GST_RDT_DEPAY (parent);
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if (GST_BUFFER_IS_DISCONT (buf)) {
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GST_LOG_OBJECT (rdtdepay, "received discont");
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rdtdepay->discont = TRUE;
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}
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if (rdtdepay->header) {
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GstBuffer *out;
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out = rdtdepay->header;
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rdtdepay->header = NULL;
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/* push header data first */
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gst_rdt_depay_push (rdtdepay, out);
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}
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/* save timestamp */
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timestamp = GST_BUFFER_TIMESTAMP (buf);
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ret = GST_FLOW_OK;
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GST_LOG_OBJECT (rdtdepay, "received buffer timestamp %" GST_TIME_FORMAT,
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GST_TIME_ARGS (timestamp));
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/* data is in RDT format. */
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more = gst_rdt_buffer_get_first_packet (buf, &packet);
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while (more) {
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GstRDTType type;
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type = gst_rdt_packet_get_type (&packet);
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GST_DEBUG_OBJECT (rdtdepay, "Have packet of type %04x", type);
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if (GST_RDT_IS_DATA_TYPE (type)) {
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GST_DEBUG_OBJECT (rdtdepay, "We have a data packet");
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ret = gst_rdt_depay_handle_data (rdtdepay, timestamp, &packet);
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} else {
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switch (type) {
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default:
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GST_DEBUG_OBJECT (rdtdepay, "Ignoring packet");
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break;
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}
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}
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if (ret != GST_FLOW_OK)
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break;
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more = gst_rdt_packet_move_to_next (&packet);
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}
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gst_buffer_unref (buf);
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return ret;
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}
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static GstStateChangeReturn
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gst_rdt_depay_change_state (GstElement * element, GstStateChange transition)
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{
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GstRDTDepay *rdtdepay;
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GstStateChangeReturn ret;
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rdtdepay = GST_RDT_DEPAY (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_segment_init (&rdtdepay->segment, GST_FORMAT_UNDEFINED);
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rdtdepay->next_seqnum = -1;
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rdtdepay->need_newsegment = TRUE;
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break;
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default:
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break;
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}
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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 (rdtdepay->header)
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gst_buffer_unref (rdtdepay->header);
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rdtdepay->header = NULL;
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|