gstreamer/gst/rtp/gstasteriskh263.c
2021-03-29 12:45:22 +02:00

226 lines
6.5 KiB
C

/* GStreamer
* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpelements.h"
#include "gstasteriskh263.h"
#define GST_ASTERISKH263_HEADER_LEN 6
typedef struct _GstAsteriskH263Header
{
guint32 timestamp; /* Timestamp */
guint16 length; /* Length */
} GstAsteriskH263Header;
#define GST_ASTERISKH263_HEADER_TIMESTAMP(data) (((GstAsteriskH263Header *)(data))->timestamp)
#define GST_ASTERISKH263_HEADER_LENGTH(data) (((GstAsteriskH263Header *)(data))->length)
static GstStaticPadTemplate gst_asteriskh263_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-asteriskh263")
);
static GstStaticPadTemplate gst_asteriskh263_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"payload = (int) [ 96, 127 ], "
"clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"")
);
static void gst_asteriskh263_finalize (GObject * object);
static GstFlowReturn gst_asteriskh263_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstStateChangeReturn gst_asteriskh263_change_state (GstElement *
element, GstStateChange transition);
#define gst_asteriskh263_parent_class parent_class
G_DEFINE_TYPE (GstAsteriskh263, gst_asteriskh263, GST_TYPE_ELEMENT);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (asteriskh263, "asteriskh263",
GST_RANK_NONE, GST_TYPE_ASTERISK_H263, rtp_element_init (plugin));
static void
gst_asteriskh263_class_init (GstAsteriskh263Class * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_asteriskh263_finalize;
gstelement_class->change_state = gst_asteriskh263_change_state;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_asteriskh263_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_asteriskh263_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP Asterisk H263 depayloader", "Codec/Depayloader/Network/RTP",
"Extracts H263 video from RTP and encodes in Asterisk H263 format",
"Neil Stratford <neils@vipadia.com>");
}
static void
gst_asteriskh263_init (GstAsteriskh263 * asteriskh263)
{
asteriskh263->srcpad =
gst_pad_new_from_static_template (&gst_asteriskh263_src_template, "src");
gst_element_add_pad (GST_ELEMENT (asteriskh263), asteriskh263->srcpad);
asteriskh263->sinkpad =
gst_pad_new_from_static_template (&gst_asteriskh263_sink_template,
"sink");
gst_pad_set_chain_function (asteriskh263->sinkpad, gst_asteriskh263_chain);
gst_element_add_pad (GST_ELEMENT (asteriskh263), asteriskh263->sinkpad);
asteriskh263->adapter = gst_adapter_new ();
}
static void
gst_asteriskh263_finalize (GObject * object)
{
GstAsteriskh263 *asteriskh263;
asteriskh263 = GST_ASTERISK_H263 (object);
g_object_unref (asteriskh263->adapter);
asteriskh263->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstFlowReturn
gst_asteriskh263_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstAsteriskh263 *asteriskh263;
GstBuffer *outbuf;
GstFlowReturn ret;
asteriskh263 = GST_ASTERISK_H263 (parent);
{
gint payload_len;
guint8 *payload;
gboolean M;
guint32 timestamp;
guint32 samples;
guint16 asterisk_len;
GstRTPBuffer rtp = { NULL };
GstMapInfo map;
if (!gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp))
goto bad_packet;
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
M = gst_rtp_buffer_get_marker (&rtp);
timestamp = gst_rtp_buffer_get_timestamp (&rtp);
gst_rtp_buffer_unmap (&rtp);
outbuf = gst_buffer_new_and_alloc (payload_len +
GST_ASTERISKH263_HEADER_LEN);
/* build the asterisk header */
asterisk_len = payload_len;
if (M)
asterisk_len |= 0x8000;
if (!asteriskh263->lastts)
asteriskh263->lastts = timestamp;
samples = timestamp - asteriskh263->lastts;
asteriskh263->lastts = timestamp;
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
GST_ASTERISKH263_HEADER_TIMESTAMP (map.data) = g_htonl (samples);
GST_ASTERISKH263_HEADER_LENGTH (map.data) = g_htons (asterisk_len);
/* copy the data into place */
memcpy (map.data + GST_ASTERISKH263_HEADER_LEN, payload, payload_len);
gst_buffer_unmap (outbuf, &map);
GST_BUFFER_PTS (outbuf) = timestamp;
if (!gst_pad_has_current_caps (asteriskh263->srcpad)) {
GstCaps *caps;
caps = gst_pad_get_pad_template_caps (asteriskh263->srcpad);
gst_pad_set_caps (asteriskh263->srcpad, caps);
gst_caps_unref (caps);
}
ret = gst_pad_push (asteriskh263->srcpad, outbuf);
gst_buffer_unref (buf);
}
return ret;
bad_packet:
{
GST_DEBUG ("Packet does not validate");
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static GstStateChangeReturn
gst_asteriskh263_change_state (GstElement * element, GstStateChange transition)
{
GstAsteriskh263 *asteriskh263;
GstStateChangeReturn ret;
asteriskh263 = GST_ASTERISK_H263 (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_adapter_clear (asteriskh263->adapter);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
/*
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
*/
return ret;
}