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230 lines
6.5 KiB
C
230 lines
6.5 KiB
C
/* GStreamer
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* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.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 <gst/rtp/gstrtpbuffer.h>
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#include "gstasteriskh263.h"
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#define GST_ASTERISKH263_HEADER_LEN 6
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typedef struct _GstAsteriskH263Header
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{
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guint32 timestamp; /* Timestamp */
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guint16 length; /* Length */
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} GstAsteriskH263Header;
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#define GST_ASTERISKH263_HEADER_TIMESTAMP(data) (((GstAsteriskH263Header *)(data))->timestamp)
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#define GST_ASTERISKH263_HEADER_LENGTH(data) (((GstAsteriskH263Header *)(data))->length)
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static GstStaticPadTemplate gst_asteriskh263_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/x-asteriskh263")
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);
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static GstStaticPadTemplate gst_asteriskh263_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-rtp, "
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"media = (string) \"video\", "
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"payload = (int) [ 96, 127 ], "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"")
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);
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static void gst_asteriskh263_finalize (GObject * object);
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static GstFlowReturn gst_asteriskh263_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buffer);
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static GstStateChangeReturn gst_asteriskh263_change_state (GstElement *
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element, GstStateChange transition);
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#define gst_asteriskh263_parent_class parent_class
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G_DEFINE_TYPE (GstAsteriskh263, gst_asteriskh263, GST_TYPE_ELEMENT);
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static void
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gst_asteriskh263_class_init (GstAsteriskh263Class * 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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gobject_class->finalize = gst_asteriskh263_finalize;
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gstelement_class->change_state = gst_asteriskh263_change_state;
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_asteriskh263_src_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_asteriskh263_sink_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP Asterisk H263 depayloader", "Codec/Depayloader/Network/RTP",
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"Extracts H263 video from RTP and encodes in Asterisk H263 format",
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"Neil Stratford <neils@vipadia.com>");
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}
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static void
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gst_asteriskh263_init (GstAsteriskh263 * asteriskh263)
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{
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asteriskh263->srcpad =
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gst_pad_new_from_static_template (&gst_asteriskh263_src_template, "src");
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gst_element_add_pad (GST_ELEMENT (asteriskh263), asteriskh263->srcpad);
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asteriskh263->sinkpad =
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gst_pad_new_from_static_template (&gst_asteriskh263_sink_template,
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"sink");
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gst_pad_set_chain_function (asteriskh263->sinkpad, gst_asteriskh263_chain);
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gst_element_add_pad (GST_ELEMENT (asteriskh263), asteriskh263->sinkpad);
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asteriskh263->adapter = gst_adapter_new ();
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}
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static void
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gst_asteriskh263_finalize (GObject * object)
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{
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GstAsteriskh263 *asteriskh263;
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asteriskh263 = GST_ASTERISK_H263 (object);
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g_object_unref (asteriskh263->adapter);
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asteriskh263->adapter = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static GstFlowReturn
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gst_asteriskh263_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
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{
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GstAsteriskh263 *asteriskh263;
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GstBuffer *outbuf;
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GstFlowReturn ret;
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asteriskh263 = GST_ASTERISK_H263 (parent);
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{
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gint payload_len;
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guint8 *payload;
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gboolean M;
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guint32 timestamp;
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guint32 samples;
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guint16 asterisk_len;
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GstRTPBuffer rtp = { NULL };
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GstMapInfo map;
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if (!gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp))
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goto bad_packet;
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payload_len = gst_rtp_buffer_get_payload_len (&rtp);
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payload = gst_rtp_buffer_get_payload (&rtp);
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M = gst_rtp_buffer_get_marker (&rtp);
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timestamp = gst_rtp_buffer_get_timestamp (&rtp);
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gst_rtp_buffer_unmap (&rtp);
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outbuf = gst_buffer_new_and_alloc (payload_len +
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GST_ASTERISKH263_HEADER_LEN);
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/* build the asterisk header */
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asterisk_len = payload_len;
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if (M)
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asterisk_len |= 0x8000;
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if (!asteriskh263->lastts)
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asteriskh263->lastts = timestamp;
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samples = timestamp - asteriskh263->lastts;
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asteriskh263->lastts = timestamp;
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gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
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GST_ASTERISKH263_HEADER_TIMESTAMP (map.data) = g_htonl (samples);
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GST_ASTERISKH263_HEADER_LENGTH (map.data) = g_htons (asterisk_len);
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/* copy the data into place */
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memcpy (map.data + GST_ASTERISKH263_HEADER_LEN, payload, payload_len);
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gst_buffer_unmap (outbuf, &map);
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GST_BUFFER_PTS (outbuf) = timestamp;
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if (!gst_pad_has_current_caps (asteriskh263->srcpad)) {
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GstCaps *caps;
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caps = gst_pad_get_pad_template_caps (asteriskh263->srcpad);
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gst_pad_set_caps (asteriskh263->srcpad, caps);
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gst_caps_unref (caps);
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}
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ret = gst_pad_push (asteriskh263->srcpad, outbuf);
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gst_buffer_unref (buf);
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}
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return ret;
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bad_packet:
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{
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GST_DEBUG ("Packet does not validate");
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gst_buffer_unref (buf);
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return GST_FLOW_ERROR;
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}
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}
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static GstStateChangeReturn
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gst_asteriskh263_change_state (GstElement * element, GstStateChange transition)
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{
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GstAsteriskh263 *asteriskh263;
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GstStateChangeReturn ret;
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asteriskh263 = GST_ASTERISK_H263 (element);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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gst_adapter_clear (asteriskh263->adapter);
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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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/*
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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*/
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return ret;
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}
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gboolean
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gst_asteriskh263_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "asteriskh263",
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GST_RANK_NONE, GST_TYPE_ASTERISK_H263);
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}
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