/* 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 "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); 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; } gboolean gst_asteriskh263_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "asteriskh263", GST_RANK_NONE, GST_TYPE_ASTERISK_H263); }