GSM -> RTP and viceversa

Original commit message from CVS:
GSM -> RTP and viceversa

gst/rtp/Makefile.am

@@ -2,9 +2,9 @@ plugindir = $(libdir)/gstreamer-@GST_MAJORMINOR@
 
 plugin_LTLIBRARIES = libgstrtp.la
 
-libgstrtp_la_SOURCES = gstrtp.c gstrtpL16enc.c gstrtpL16parse.c rtp-packet.c
+libgstrtp_la_SOURCES = gstrtp.c gstrtpL16enc.c gstrtpL16parse.c gstrtpgsmenc.c gstrtpgsmparse.c rtp-packet.c
 
 libgstrtp_la_CFLAGS = $(GST_CFLAGS)
 libgstrtp_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 
-noinst_HEADERS = gstrtpL16enc.h gstrtpL16parse.h gstrtp-common.h rtp-packet.h
+noinst_HEADERS = gstrtpL16enc.h gstrtpL16parse.h gstrtpgsmenc.h gstrtpgsmparse.h gstrtp-common.h rtp-packet.h

gst/rtp/gstrtp.c

@@ -19,12 +19,16 @@
 
 #include "gstrtpL16enc.h"
 #include "gstrtpL16parse.h"
+#include "gstrtpgsmenc.h"
+#include "gstrtpgsmparse.h"
 
 static gboolean
 plugin_init (GModule *module, GstPlugin *plugin)
 {
   gst_rtpL16enc_plugin_init (module, plugin);
   gst_rtpL16parse_plugin_init (module, plugin);
+  gst_rtpgsmenc_plugin_init (module, plugin);
+  gst_rtpgsmparse_plugin_init (module, plugin);
 
   return TRUE;
 }

gst/rtp/gstrtpL16depay.c

@@ -146,11 +146,11 @@ gst_rtpL16parse_init (GstRtpL16Parse * rtpL16parse)
 void
 gst_rtpL16parse_ntohs (GstBuffer *buf)
 {
-  guint16 *i, *len;
+  gint16 *i, *len;
 
   /* FIXME: is this code correct or even sane at all? */
-  i = (guint16 *) GST_BUFFER_DATA(buf); 
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
-  len = i + GST_BUFFER_SIZE (buf) / sizeof (guint16 *);
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
 
   for (; i<len; i++) {
       *i = g_ntohs (*i);

gst/rtp/gstrtpL16enc.c

@@ -164,11 +164,11 @@ gst_rtpL16enc_sinkconnect (GstPad * pad, GstCaps * caps)
 void
 gst_rtpL16enc_htons (GstBuffer *buf)
 {
-  guint16 *i, *len;
+  gint16 *i, *len;
 
   /* FIXME: is this code correct or even sane at all? */
-  i = (guint16 *) GST_BUFFER_DATA(buf); 
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
-  len = i + GST_BUFFER_SIZE (buf) / sizeof (guint16 *);
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
 
   for (; i<len; i++) {
       *i = g_htons (*i);

gst/rtp/gstrtpL16parse.c

@@ -146,11 +146,11 @@ gst_rtpL16parse_init (GstRtpL16Parse * rtpL16parse)
 void
 gst_rtpL16parse_ntohs (GstBuffer *buf)
 {
-  guint16 *i, *len;
+  gint16 *i, *len;
 
   /* FIXME: is this code correct or even sane at all? */
-  i = (guint16 *) GST_BUFFER_DATA(buf); 
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
-  len = i + GST_BUFFER_SIZE (buf) / sizeof (guint16 *);
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
 
   for (; i<len; i++) {
       *i = g_ntohs (*i);

gst/rtp/gstrtpL16pay.c

@@ -164,11 +164,11 @@ gst_rtpL16enc_sinkconnect (GstPad * pad, GstCaps * caps)
 void
 gst_rtpL16enc_htons (GstBuffer *buf)
 {
-  guint16 *i, *len;
+  gint16 *i, *len;
 
   /* FIXME: is this code correct or even sane at all? */
-  i = (guint16 *) GST_BUFFER_DATA(buf); 
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
-  len = i + GST_BUFFER_SIZE (buf) / sizeof (guint16 *);
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
 
   for (; i<len; i++) {
       *i = g_htons (*i);

gst/rtp/gstrtpgsmdepay.c

@@ -0,0 +1,295 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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 
+ */
+
+#include <string.h>
+#include "gstrtpgsmparse.h"
+#include "gstrtp-common.h"
+
+/* elementfactory information */
+static GstElementDetails gst_rtp_L16parse_details = {
+  "RTP packet parser",
+  "RtpGSMParse",
+  "GPL",
+  "Extracts GSM audio from RTP packets",
+  VERSION,
+  "Zeeshan Ali <zak147@yahoo.com>",
+  "(C) 2003",
+};
+
+/* RtpGSMParse signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+  ARG_FREQUENCY
+};
+
+GST_PAD_TEMPLATE_FACTORY (src_factory,
+ 	"src",
+	GST_PAD_SRC,
+	GST_PAD_ALWAYS,
+	GST_CAPS_NEW (
+    		 "gsm_gsm",
+    		 "audio/x-gsm",
+      		 "rate",       GST_PROPS_INT_RANGE (1000, 48000))
+)
+ 
+GST_PAD_TEMPLATE_FACTORY (sink_factory,
+	"sink",
+	GST_PAD_SINK,
+	GST_PAD_ALWAYS,
+	GST_CAPS_NEW (
+		"rtp",
+		"application/x-rtp",
+		NULL)
+);
+
+static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
+static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);
+
+static void gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf);
+
+static void gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
+				   const GValue * value, GParamSpec * pspec);
+static void gst_rtpgsmparse_get_property (GObject * object, guint prop_id,
+				   GValue * value, GParamSpec * pspec);
+static GstElementStateReturn gst_rtpgsmparse_change_state (GstElement * element);
+
+static GstElementClass *parent_class = NULL;
+
+static GType gst_rtpgsmparse_get_type (void)
+{
+  static GType rtpgsmparse_type = 0;
+
+  if (!rtpgsmparse_type) {
+    static const GTypeInfo rtpgsmparse_info = {
+      sizeof (GstRtpGSMParseClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_rtpgsmparse_class_init,
+      NULL,
+      NULL,
+      sizeof (GstRtpGSMParse),
+      0,
+      (GInstanceInitFunc) gst_rtpgsmparse_init,
+    };
+
+    rtpgsmparse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMParse", &rtpgsmparse_info, 0);
+  }
+  return rtpgsmparse_type;
+}
+
+static void
+gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQUENCY, 
+		g_param_spec_int ("frequency", "frequency", "frequency", 
+			G_MININT, G_MAXINT, 8000, G_PARAM_READWRITE));
+
+  gobject_class->set_property = gst_rtpgsmparse_set_property;
+  gobject_class->get_property = gst_rtpgsmparse_get_property;
+
+  gstelement_class->change_state = gst_rtpgsmparse_change_state;
+}
+
+static void
+gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse)
+{
+  rtpgsmparse->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
+  rtpgsmparse->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
+  gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->srcpad);
+  gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->sinkpad);
+  gst_pad_set_chain_function (rtpgsmparse->sinkpad, gst_rtpgsmparse_chain);
+
+  rtpgsmparse->frequency = 8000;
+}
+
+void
+gst_rtpgsmparse_ntohs (GstBuffer *buf)
+{
+  gint16 *i, *len;
+
+  /* FIXME: is this code correct or even sane at all? */
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
+
+  for (; i<len; i++) {
+      *i = g_ntohs (*i);
+  }
+}
+
+void
+gst_rtpgsm_caps_nego (GstRtpGSMParse *rtpgsmparse)
+{
+  GstCaps *caps;
+
+  caps = GST_CAPS_NEW (
+    		 "gsm_gsm",
+    		 "audio/x-gsm",
+		 "rate",	GST_PROPS_INT (rtpgsmparse->frequency));
+
+  gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
+}
+
+static void
+gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstRtpGSMParse *rtpgsmparse;
+  GstBuffer *outbuf;
+  Rtp_Packet packet;
+  rtp_payload_t pt;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  rtpgsmparse = GST_RTP_GSM_PARSE (GST_OBJECT_PARENT (pad));
+
+  g_return_if_fail (rtpgsmparse != NULL);
+  g_return_if_fail (GST_IS_RTP_GSM_PARSE (rtpgsmparse));
+
+  if (GST_IS_EVENT (buf)) {
+    GstEvent *event = GST_EVENT (buf);
+    gst_pad_event_default (pad, event);
+  
+    return;
+  }
+
+  if (GST_PAD_CAPS (rtpgsmparse->srcpad) == NULL) {
+    gst_rtpgsm_caps_nego (rtpgsmparse);
+  }
+
+  packet = rtp_packet_new_copy_data (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
+
+  pt = rtp_packet_get_payload_type (packet);
+
+  if (pt != PAYLOAD_GSM) {
+    g_warning ("Unexpected paload type %u\n", pt);
+    rtp_packet_free (packet);
+    gst_buffer_unref (buf);
+    return;
+  }
+
+  outbuf = gst_buffer_new ();
+  GST_BUFFER_SIZE (outbuf) = rtp_packet_get_payload_len (packet);
+  GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
+  GST_BUFFER_TIMESTAMP (outbuf) = g_ntohl (rtp_packet_get_timestamp (packet)) * GST_SECOND;
+
+  memcpy (GST_BUFFER_DATA (outbuf), rtp_packet_get_payload (packet), GST_BUFFER_SIZE (outbuf));
+        
+  GST_DEBUG (0,"gst_rtpgsmparse_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
+
+/* FIXME: According to RFC 1890, this is required, right? */
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+     gst_rtpgsmparse_ntohs (outbuf);
+#endif
+
+  gst_pad_push (rtpgsmparse->srcpad, outbuf);
+
+  rtp_packet_free (packet);
+  gst_buffer_unref (buf);
+}
+
+static void
+gst_rtpgsmparse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMParse *rtpgsmparse;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
+  rtpgsmparse = GST_RTP_GSM_PARSE (object);
+
+  switch (prop_id) {
+    case ARG_FREQUENCY:
+      rtpgsmparse->frequency = g_value_get_int (value);
+      break;
+    default:
+      break;
+  }
+}
+
+static void
+gst_rtpgsmparse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMParse *rtpgsmparse;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
+  rtpgsmparse = GST_RTP_GSM_PARSE (object);
+
+  switch (prop_id) {
+    case ARG_FREQUENCY:
+      g_value_set_int (value, rtpgsmparse->frequency);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstElementStateReturn
+gst_rtpgsmparse_change_state (GstElement * element)
+{
+  GstRtpGSMParse *rtpgsmparse;
+
+  g_return_val_if_fail (GST_IS_RTP_GSM_PARSE (element), GST_STATE_FAILURE);
+
+  rtpgsmparse = GST_RTP_GSM_PARSE (element);
+
+  GST_DEBUG (0, "state pending %d\n", GST_STATE_PENDING (element));
+
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_NULL_TO_READY:
+      break;
+    case GST_STATE_READY_TO_NULL:
+      break;
+    default:
+      break;
+  }
+
+  /* if we haven't failed already, give the parent class a chance to ;-) */
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
+
+gboolean
+gst_rtpgsmparse_plugin_init (GModule * module, GstPlugin * plugin)
+{
+  GstElementFactory *rtpgsmparse;
+
+  rtpgsmparse = gst_element_factory_new ("rtpgsmparse", GST_TYPE_RTP_GSM_PARSE, &gst_rtp_L16parse_details);
+  g_return_val_if_fail (rtpgsmparse != NULL, FALSE);
+
+  gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (src_factory));
+  gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (sink_factory));
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (rtpgsmparse));
+
+  return TRUE;
+}

gst/rtp/gstrtpgsmdepay.h

@@ -0,0 +1,70 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_RTP_GSM_PARSE_H__
+#define __GST_RTP_GSM_PARSE_H__
+
+#include <gst/gst.h>
+#include "rtp-packet.h"
+#include "gstrtp-common.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif				/* __cplusplus */
+
+/* Definition of structure storing data for this element. */
+typedef struct _GstRtpGSMParse GstRtpGSMParse;
+struct _GstRtpGSMParse
+{
+  GstElement element;
+
+  GstPad *sinkpad;
+  GstPad *srcpad;
+
+  guint frequency;
+};
+
+/* Standard definition defining a class for this element. */
+typedef struct _GstRtpGSMParseClass GstRtpGSMParseClass;
+struct _GstRtpGSMParseClass
+{
+  GstElementClass parent_class;
+};
+
+/* Standard macros for defining types for this element.  */
+#define GST_TYPE_RTP_GSM_PARSE \
+  (gst_rtpgsmparse_get_type())
+#define GST_RTP_GSM_PARSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_GSM_PARSE,GstRtpGSMParse))
+#define GST_RTP_GSM_PARSE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_GSM_PARSE,GstRtpGSMParse))
+#define GST_IS_RTP_GSM_PARSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_GSM_PARSE))
+#define GST_IS_RTP_GSM_PARSE_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_GSM_PARSE))
+
+gboolean gst_rtpgsmparse_plugin_init (GModule * module, GstPlugin * plugin);
+
+#ifdef __cplusplus
+}
+#endif				/* __cplusplus */
+
+
+#endif				/* __GST_RTP_GSM_PARSE_H__ */

gst/rtp/gstrtpgsmenc.c

@@ -0,0 +1,310 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <string.h>
+#include "gstrtpgsmenc.h"
+
+/* elementfactory information */
+static GstElementDetails gst_rtpgsmenc_details = {
+  "RTP GSM Audio Encoder",
+  "RtpGSMEnc",
+  "LGPL",
+  "Encodes GSM audio into an RTP packet",
+  VERSION,
+  "Zeeshan Ali <zak147@yahoo.com>",
+  "(C) 2003",
+};
+
+/* RtpGSMEnc signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  /* FILL ME */
+  ARG_0,
+};
+
+GST_PAD_TEMPLATE_FACTORY (sink_factory,
+		"sink",
+		GST_PAD_SINK,
+	        GST_PAD_ALWAYS,
+		GST_CAPS_NEW (
+    			"gsm_gsm",
+    			"audio/x-gsm",
+      			"rate",       GST_PROPS_INT_RANGE (1000, 48000)
+		)
+);
+
+GST_PAD_TEMPLATE_FACTORY (src_factory,
+		"src",
+		GST_PAD_SRC,
+	        GST_PAD_ALWAYS,
+		GST_CAPS_NEW (
+			"rtp",
+			"application/x-rtp",
+			NULL)
+);
+
+static void gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass);
+static void gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc);
+static void gst_rtpgsmenc_chain (GstPad * pad, GstBuffer * buf);
+static void gst_rtpgsmenc_set_property (GObject * object, guint prop_id,
+				   const GValue * value, GParamSpec * pspec);
+static void gst_rtpgsmenc_get_property (GObject * object, guint prop_id,
+				   GValue * value, GParamSpec * pspec);
+static GstPadLinkReturn gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps);
+static GstElementStateReturn gst_rtpgsmenc_change_state (GstElement * element);
+
+static GstElementClass *parent_class = NULL;
+
+static GType gst_rtpgsmenc_get_type (void)
+{
+  static GType rtpgsmenc_type = 0;
+
+  if (!rtpgsmenc_type) {
+    static const GTypeInfo rtpgsmenc_info = {
+      sizeof (GstRtpGSMEncClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_rtpgsmenc_class_init,
+      NULL,
+      NULL,
+      sizeof (GstRtpGSMEnc),
+      0,
+      (GInstanceInitFunc) gst_rtpgsmenc_init,
+    };
+
+    rtpgsmenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMEnc", &rtpgsmenc_info, 0);
+  }
+  return rtpgsmenc_type;
+}
+
+static void
+gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_rtpgsmenc_set_property;
+  gobject_class->get_property = gst_rtpgsmenc_get_property;
+
+  gstelement_class->change_state = gst_rtpgsmenc_change_state;
+}
+
+static void
+gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc)
+{
+  rtpgsmenc->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
+  rtpgsmenc->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
+  gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->sinkpad);
+  gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->srcpad);
+  gst_pad_set_chain_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_chain);
+  gst_pad_set_link_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_sinkconnect);
+
+  rtpgsmenc->frequency = 8000;
+
+  rtpgsmenc->next_time = 0; 
+  rtpgsmenc->time_interval = 0;
+
+  rtpgsmenc->seq = 0;
+  rtpgsmenc->ssrc = random ();
+}
+
+static GstPadLinkReturn
+gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  rtpgsmenc = GST_RTP_GSM_ENC (gst_pad_get_parent (pad));
+
+  gst_caps_get_int (caps, "rate", &rtpgsmenc->frequency);
+
+  /* Pre-calculate what we can */
+  rtpgsmenc->time_interval = GST_SECOND / (2 * rtpgsmenc->frequency);
+
+  return GST_PAD_LINK_OK;
+}
+
+
+void
+gst_rtpgsmenc_htons (GstBuffer *buf)
+{
+  gint16 *i, *len;
+
+  /* FIXME: is this code correct or even sane at all? */
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
+
+  for (; i<len; i++) {
+      *i = g_htons (*i);
+  }
+}
+
+static void
+gst_rtpgsmenc_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+  GstBuffer *outbuf;
+  Rtp_Packet packet;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  rtpgsmenc = GST_RTP_GSM_ENC (GST_OBJECT_PARENT (pad));
+
+  g_return_if_fail (rtpgsmenc != NULL);
+  g_return_if_fail (GST_IS_RTP_GSM_ENC (rtpgsmenc));
+
+  if (GST_IS_EVENT (buf)) {
+    GstEvent *event = GST_EVENT (buf);
+
+    switch (GST_EVENT_TYPE (event)) {
+      case GST_EVENT_DISCONTINUOUS:
+	GST_DEBUG (GST_CAT_EVENT, "discont"); 
+        rtpgsmenc->next_time = 0;
+        gst_pad_event_default (pad, event);
+	return;
+      default:
+        gst_pad_event_default (pad, event);
+	return;
+    }
+  }
+
+  /* We only need the header */
+  packet = rtp_packet_new_allocate (0, 0, 0);
+
+  rtp_packet_set_csrc_count (packet, 0);
+  rtp_packet_set_extension (packet, 0);
+  rtp_packet_set_padding (packet, 0);
+  rtp_packet_set_version (packet, RTP_VERSION);
+  rtp_packet_set_marker (packet, 0);
+  rtp_packet_set_ssrc (packet, g_htonl (rtpgsmenc->ssrc));
+  rtp_packet_set_seq (packet, g_htons (rtpgsmenc->seq));
+  rtp_packet_set_timestamp (packet, g_htonl ((guint32) rtpgsmenc->next_time / GST_SECOND));
+  rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_GSM);
+
+  /* FIXME: According to RFC 1890, this is required, right? */
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+  gst_rtpgsmenc_htons (buf);
+#endif
+
+  outbuf = gst_buffer_new ();
+  GST_BUFFER_SIZE (outbuf) = rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
+  GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
+  GST_BUFFER_TIMESTAMP (outbuf) = rtpgsmenc->next_time;
+
+  memcpy (GST_BUFFER_DATA (outbuf), packet->data, rtp_packet_get_packet_len (packet));
+  memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len(packet), GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
+
+  GST_DEBUG (0,"gst_rtpgsmenc_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
+  gst_pad_push (rtpgsmenc->srcpad, outbuf);
+
+  ++rtpgsmenc->seq;
+  rtpgsmenc->next_time += rtpgsmenc->time_interval * GST_BUFFER_SIZE (buf);
+  
+  rtp_packet_free (packet);
+  gst_buffer_unref (buf);
+}
+
+static void
+gst_rtpgsmenc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
+  rtpgsmenc = GST_RTP_GSM_ENC (object);
+
+  switch (prop_id) {
+    default:
+      break;
+  }
+}
+
+static void
+gst_rtpgsmenc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
+  rtpgsmenc = GST_RTP_GSM_ENC (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstElementStateReturn
+gst_rtpgsmenc_change_state (GstElement * element)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  g_return_val_if_fail (GST_IS_RTP_GSM_ENC (element), GST_STATE_FAILURE);
+
+  rtpgsmenc = GST_RTP_GSM_ENC (element);
+
+  GST_DEBUG (0, "state pending %d\n", GST_STATE_PENDING (element));
+
+  /* if going down into NULL state, close the file if it's open */
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_NULL_TO_READY:
+      break;
+
+    case GST_STATE_READY_TO_NULL:
+      break;
+
+    default:
+      break;
+  }
+
+  /* if we haven't failed already, give the parent class a chance to ;-) */
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
+
+gboolean
+gst_rtpgsmenc_plugin_init (GModule * module, GstPlugin * plugin)
+{
+  GstElementFactory *rtpgsmenc;
+
+  rtpgsmenc = gst_element_factory_new ("rtpgsmenc", GST_TYPE_RTP_GSM_ENC, &gst_rtpgsmenc_details);
+  g_return_val_if_fail (rtpgsmenc != NULL, FALSE);
+
+  gst_element_factory_add_pad_template (rtpgsmenc, GST_PAD_TEMPLATE_GET (sink_factory));
+  gst_element_factory_add_pad_template (rtpgsmenc, GST_PAD_TEMPLATE_GET (src_factory));
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (rtpgsmenc));
+
+  return TRUE;
+}

gst/rtp/gstrtpgsmenc.h

@@ -0,0 +1,79 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#ifndef __GST_RTP_GSM_ENC_H__
+#define __GST_RTP_GSM_ENC_H__
+
+#include <gst/gst.h>
+#include "rtp-packet.h"
+#include "gstrtp-common.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif				/* __cplusplus */
+
+/* Definition of structure storing data for this element. */
+typedef struct _GstRtpGSMEnc GstRtpGSMEnc;
+struct _GstRtpGSMEnc
+{
+  GstElement element;
+
+  GstPad *sinkpad;
+  GstPad *srcpad;
+
+  guint frequency;
+
+  /* the timestamp of the next frame */
+  guint64 next_time;
+  /* the interval between frames */
+  guint64 time_interval;
+  
+  guint32 ssrc;
+  guint16 seq;
+};
+
+/* Standard definition defining a class for this element. */
+typedef struct _GstRtpGSMEncClass GstRtpGSMEncClass;
+struct _GstRtpGSMEncClass
+{
+  GstElementClass parent_class;
+};
+
+/* Standard macros for defining types for this element.  */
+#define GST_TYPE_RTP_GSM_ENC \
+  (gst_rtpgsmenc_get_type())
+#define GST_RTP_GSM_ENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_GSM_ENC,GstRtpGSMEnc))
+#define GST_RTP_GSM_ENC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_GSM_ENC,GstRtpGSMEnc))
+#define GST_IS_RTP_GSM_ENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_GSM_ENC))
+#define GST_IS_RTP_GSM_ENC_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_GSM_ENC))
+
+gboolean gst_rtpgsmenc_plugin_init (GModule * module, GstPlugin * plugin);
+
+#ifdef __cplusplus
+}
+#endif				/* __cplusplus */
+
+
+#endif				/* __GST_RTP_GSM_ENC_H__ */

gst/rtp/gstrtpgsmparse.c

@@ -0,0 +1,295 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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 
+ */
+
+#include <string.h>
+#include "gstrtpgsmparse.h"
+#include "gstrtp-common.h"
+
+/* elementfactory information */
+static GstElementDetails gst_rtp_L16parse_details = {
+  "RTP packet parser",
+  "RtpGSMParse",
+  "GPL",
+  "Extracts GSM audio from RTP packets",
+  VERSION,
+  "Zeeshan Ali <zak147@yahoo.com>",
+  "(C) 2003",
+};
+
+/* RtpGSMParse signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+  ARG_FREQUENCY
+};
+
+GST_PAD_TEMPLATE_FACTORY (src_factory,
+ 	"src",
+	GST_PAD_SRC,
+	GST_PAD_ALWAYS,
+	GST_CAPS_NEW (
+    		 "gsm_gsm",
+    		 "audio/x-gsm",
+      		 "rate",       GST_PROPS_INT_RANGE (1000, 48000))
+)
+ 
+GST_PAD_TEMPLATE_FACTORY (sink_factory,
+	"sink",
+	GST_PAD_SINK,
+	GST_PAD_ALWAYS,
+	GST_CAPS_NEW (
+		"rtp",
+		"application/x-rtp",
+		NULL)
+);
+
+static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
+static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);
+
+static void gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf);
+
+static void gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
+				   const GValue * value, GParamSpec * pspec);
+static void gst_rtpgsmparse_get_property (GObject * object, guint prop_id,
+				   GValue * value, GParamSpec * pspec);
+static GstElementStateReturn gst_rtpgsmparse_change_state (GstElement * element);
+
+static GstElementClass *parent_class = NULL;
+
+static GType gst_rtpgsmparse_get_type (void)
+{
+  static GType rtpgsmparse_type = 0;
+
+  if (!rtpgsmparse_type) {
+    static const GTypeInfo rtpgsmparse_info = {
+      sizeof (GstRtpGSMParseClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_rtpgsmparse_class_init,
+      NULL,
+      NULL,
+      sizeof (GstRtpGSMParse),
+      0,
+      (GInstanceInitFunc) gst_rtpgsmparse_init,
+    };
+
+    rtpgsmparse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMParse", &rtpgsmparse_info, 0);
+  }
+  return rtpgsmparse_type;
+}
+
+static void
+gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQUENCY, 
+		g_param_spec_int ("frequency", "frequency", "frequency", 
+			G_MININT, G_MAXINT, 8000, G_PARAM_READWRITE));
+
+  gobject_class->set_property = gst_rtpgsmparse_set_property;
+  gobject_class->get_property = gst_rtpgsmparse_get_property;
+
+  gstelement_class->change_state = gst_rtpgsmparse_change_state;
+}
+
+static void
+gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse)
+{
+  rtpgsmparse->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
+  rtpgsmparse->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
+  gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->srcpad);
+  gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->sinkpad);
+  gst_pad_set_chain_function (rtpgsmparse->sinkpad, gst_rtpgsmparse_chain);
+
+  rtpgsmparse->frequency = 8000;
+}
+
+void
+gst_rtpgsmparse_ntohs (GstBuffer *buf)
+{
+  gint16 *i, *len;
+
+  /* FIXME: is this code correct or even sane at all? */
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
+
+  for (; i<len; i++) {
+      *i = g_ntohs (*i);
+  }
+}
+
+void
+gst_rtpgsm_caps_nego (GstRtpGSMParse *rtpgsmparse)
+{
+  GstCaps *caps;
+
+  caps = GST_CAPS_NEW (
+    		 "gsm_gsm",
+    		 "audio/x-gsm",
+		 "rate",	GST_PROPS_INT (rtpgsmparse->frequency));
+
+  gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
+}
+
+static void
+gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstRtpGSMParse *rtpgsmparse;
+  GstBuffer *outbuf;
+  Rtp_Packet packet;
+  rtp_payload_t pt;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  rtpgsmparse = GST_RTP_GSM_PARSE (GST_OBJECT_PARENT (pad));
+
+  g_return_if_fail (rtpgsmparse != NULL);
+  g_return_if_fail (GST_IS_RTP_GSM_PARSE (rtpgsmparse));
+
+  if (GST_IS_EVENT (buf)) {
+    GstEvent *event = GST_EVENT (buf);
+    gst_pad_event_default (pad, event);
+  
+    return;
+  }
+
+  if (GST_PAD_CAPS (rtpgsmparse->srcpad) == NULL) {
+    gst_rtpgsm_caps_nego (rtpgsmparse);
+  }
+
+  packet = rtp_packet_new_copy_data (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
+
+  pt = rtp_packet_get_payload_type (packet);
+
+  if (pt != PAYLOAD_GSM) {
+    g_warning ("Unexpected paload type %u\n", pt);
+    rtp_packet_free (packet);
+    gst_buffer_unref (buf);
+    return;
+  }
+
+  outbuf = gst_buffer_new ();
+  GST_BUFFER_SIZE (outbuf) = rtp_packet_get_payload_len (packet);
+  GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
+  GST_BUFFER_TIMESTAMP (outbuf) = g_ntohl (rtp_packet_get_timestamp (packet)) * GST_SECOND;
+
+  memcpy (GST_BUFFER_DATA (outbuf), rtp_packet_get_payload (packet), GST_BUFFER_SIZE (outbuf));
+        
+  GST_DEBUG (0,"gst_rtpgsmparse_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
+
+/* FIXME: According to RFC 1890, this is required, right? */
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+     gst_rtpgsmparse_ntohs (outbuf);
+#endif
+
+  gst_pad_push (rtpgsmparse->srcpad, outbuf);
+
+  rtp_packet_free (packet);
+  gst_buffer_unref (buf);
+}
+
+static void
+gst_rtpgsmparse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMParse *rtpgsmparse;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
+  rtpgsmparse = GST_RTP_GSM_PARSE (object);
+
+  switch (prop_id) {
+    case ARG_FREQUENCY:
+      rtpgsmparse->frequency = g_value_get_int (value);
+      break;
+    default:
+      break;
+  }
+}
+
+static void
+gst_rtpgsmparse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMParse *rtpgsmparse;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
+  rtpgsmparse = GST_RTP_GSM_PARSE (object);
+
+  switch (prop_id) {
+    case ARG_FREQUENCY:
+      g_value_set_int (value, rtpgsmparse->frequency);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstElementStateReturn
+gst_rtpgsmparse_change_state (GstElement * element)
+{
+  GstRtpGSMParse *rtpgsmparse;
+
+  g_return_val_if_fail (GST_IS_RTP_GSM_PARSE (element), GST_STATE_FAILURE);
+
+  rtpgsmparse = GST_RTP_GSM_PARSE (element);
+
+  GST_DEBUG (0, "state pending %d\n", GST_STATE_PENDING (element));
+
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_NULL_TO_READY:
+      break;
+    case GST_STATE_READY_TO_NULL:
+      break;
+    default:
+      break;
+  }
+
+  /* if we haven't failed already, give the parent class a chance to ;-) */
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
+
+gboolean
+gst_rtpgsmparse_plugin_init (GModule * module, GstPlugin * plugin)
+{
+  GstElementFactory *rtpgsmparse;
+
+  rtpgsmparse = gst_element_factory_new ("rtpgsmparse", GST_TYPE_RTP_GSM_PARSE, &gst_rtp_L16parse_details);
+  g_return_val_if_fail (rtpgsmparse != NULL, FALSE);
+
+  gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (src_factory));
+  gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (sink_factory));
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (rtpgsmparse));
+
+  return TRUE;
+}

gst/rtp/gstrtpgsmparse.h

@@ -0,0 +1,70 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_RTP_GSM_PARSE_H__
+#define __GST_RTP_GSM_PARSE_H__
+
+#include <gst/gst.h>
+#include "rtp-packet.h"
+#include "gstrtp-common.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif				/* __cplusplus */
+
+/* Definition of structure storing data for this element. */
+typedef struct _GstRtpGSMParse GstRtpGSMParse;
+struct _GstRtpGSMParse
+{
+  GstElement element;
+
+  GstPad *sinkpad;
+  GstPad *srcpad;
+
+  guint frequency;
+};
+
+/* Standard definition defining a class for this element. */
+typedef struct _GstRtpGSMParseClass GstRtpGSMParseClass;
+struct _GstRtpGSMParseClass
+{
+  GstElementClass parent_class;
+};
+
+/* Standard macros for defining types for this element.  */
+#define GST_TYPE_RTP_GSM_PARSE \
+  (gst_rtpgsmparse_get_type())
+#define GST_RTP_GSM_PARSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_GSM_PARSE,GstRtpGSMParse))
+#define GST_RTP_GSM_PARSE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_GSM_PARSE,GstRtpGSMParse))
+#define GST_IS_RTP_GSM_PARSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_GSM_PARSE))
+#define GST_IS_RTP_GSM_PARSE_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_GSM_PARSE))
+
+gboolean gst_rtpgsmparse_plugin_init (GModule * module, GstPlugin * plugin);
+
+#ifdef __cplusplus
+}
+#endif				/* __cplusplus */
+
+
+#endif				/* __GST_RTP_GSM_PARSE_H__ */

gst/rtp/gstrtpgsmpay.c

@@ -0,0 +1,310 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <string.h>
+#include "gstrtpgsmenc.h"
+
+/* elementfactory information */
+static GstElementDetails gst_rtpgsmenc_details = {
+  "RTP GSM Audio Encoder",
+  "RtpGSMEnc",
+  "LGPL",
+  "Encodes GSM audio into an RTP packet",
+  VERSION,
+  "Zeeshan Ali <zak147@yahoo.com>",
+  "(C) 2003",
+};
+
+/* RtpGSMEnc signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  /* FILL ME */
+  ARG_0,
+};
+
+GST_PAD_TEMPLATE_FACTORY (sink_factory,
+		"sink",
+		GST_PAD_SINK,
+	        GST_PAD_ALWAYS,
+		GST_CAPS_NEW (
+    			"gsm_gsm",
+    			"audio/x-gsm",
+      			"rate",       GST_PROPS_INT_RANGE (1000, 48000)
+		)
+);
+
+GST_PAD_TEMPLATE_FACTORY (src_factory,
+		"src",
+		GST_PAD_SRC,
+	        GST_PAD_ALWAYS,
+		GST_CAPS_NEW (
+			"rtp",
+			"application/x-rtp",
+			NULL)
+);
+
+static void gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass);
+static void gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc);
+static void gst_rtpgsmenc_chain (GstPad * pad, GstBuffer * buf);
+static void gst_rtpgsmenc_set_property (GObject * object, guint prop_id,
+				   const GValue * value, GParamSpec * pspec);
+static void gst_rtpgsmenc_get_property (GObject * object, guint prop_id,
+				   GValue * value, GParamSpec * pspec);
+static GstPadLinkReturn gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps);
+static GstElementStateReturn gst_rtpgsmenc_change_state (GstElement * element);
+
+static GstElementClass *parent_class = NULL;
+
+static GType gst_rtpgsmenc_get_type (void)
+{
+  static GType rtpgsmenc_type = 0;
+
+  if (!rtpgsmenc_type) {
+    static const GTypeInfo rtpgsmenc_info = {
+      sizeof (GstRtpGSMEncClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_rtpgsmenc_class_init,
+      NULL,
+      NULL,
+      sizeof (GstRtpGSMEnc),
+      0,
+      (GInstanceInitFunc) gst_rtpgsmenc_init,
+    };
+
+    rtpgsmenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMEnc", &rtpgsmenc_info, 0);
+  }
+  return rtpgsmenc_type;
+}
+
+static void
+gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_rtpgsmenc_set_property;
+  gobject_class->get_property = gst_rtpgsmenc_get_property;
+
+  gstelement_class->change_state = gst_rtpgsmenc_change_state;
+}
+
+static void
+gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc)
+{
+  rtpgsmenc->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
+  rtpgsmenc->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
+  gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->sinkpad);
+  gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->srcpad);
+  gst_pad_set_chain_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_chain);
+  gst_pad_set_link_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_sinkconnect);
+
+  rtpgsmenc->frequency = 8000;
+
+  rtpgsmenc->next_time = 0; 
+  rtpgsmenc->time_interval = 0;
+
+  rtpgsmenc->seq = 0;
+  rtpgsmenc->ssrc = random ();
+}
+
+static GstPadLinkReturn
+gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  rtpgsmenc = GST_RTP_GSM_ENC (gst_pad_get_parent (pad));
+
+  gst_caps_get_int (caps, "rate", &rtpgsmenc->frequency);
+
+  /* Pre-calculate what we can */
+  rtpgsmenc->time_interval = GST_SECOND / (2 * rtpgsmenc->frequency);
+
+  return GST_PAD_LINK_OK;
+}
+
+
+void
+gst_rtpgsmenc_htons (GstBuffer *buf)
+{
+  gint16 *i, *len;
+
+  /* FIXME: is this code correct or even sane at all? */
+  i = (gint16 *) GST_BUFFER_DATA(buf); 
+  len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
+
+  for (; i<len; i++) {
+      *i = g_htons (*i);
+  }
+}
+
+static void
+gst_rtpgsmenc_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+  GstBuffer *outbuf;
+  Rtp_Packet packet;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  rtpgsmenc = GST_RTP_GSM_ENC (GST_OBJECT_PARENT (pad));
+
+  g_return_if_fail (rtpgsmenc != NULL);
+  g_return_if_fail (GST_IS_RTP_GSM_ENC (rtpgsmenc));
+
+  if (GST_IS_EVENT (buf)) {
+    GstEvent *event = GST_EVENT (buf);
+
+    switch (GST_EVENT_TYPE (event)) {
+      case GST_EVENT_DISCONTINUOUS:
+	GST_DEBUG (GST_CAT_EVENT, "discont"); 
+        rtpgsmenc->next_time = 0;
+        gst_pad_event_default (pad, event);
+	return;
+      default:
+        gst_pad_event_default (pad, event);
+	return;
+    }
+  }
+
+  /* We only need the header */
+  packet = rtp_packet_new_allocate (0, 0, 0);
+
+  rtp_packet_set_csrc_count (packet, 0);
+  rtp_packet_set_extension (packet, 0);
+  rtp_packet_set_padding (packet, 0);
+  rtp_packet_set_version (packet, RTP_VERSION);
+  rtp_packet_set_marker (packet, 0);
+  rtp_packet_set_ssrc (packet, g_htonl (rtpgsmenc->ssrc));
+  rtp_packet_set_seq (packet, g_htons (rtpgsmenc->seq));
+  rtp_packet_set_timestamp (packet, g_htonl ((guint32) rtpgsmenc->next_time / GST_SECOND));
+  rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_GSM);
+
+  /* FIXME: According to RFC 1890, this is required, right? */
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+  gst_rtpgsmenc_htons (buf);
+#endif
+
+  outbuf = gst_buffer_new ();
+  GST_BUFFER_SIZE (outbuf) = rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
+  GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
+  GST_BUFFER_TIMESTAMP (outbuf) = rtpgsmenc->next_time;
+
+  memcpy (GST_BUFFER_DATA (outbuf), packet->data, rtp_packet_get_packet_len (packet));
+  memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len(packet), GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
+
+  GST_DEBUG (0,"gst_rtpgsmenc_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
+  gst_pad_push (rtpgsmenc->srcpad, outbuf);
+
+  ++rtpgsmenc->seq;
+  rtpgsmenc->next_time += rtpgsmenc->time_interval * GST_BUFFER_SIZE (buf);
+  
+  rtp_packet_free (packet);
+  gst_buffer_unref (buf);
+}
+
+static void
+gst_rtpgsmenc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
+  rtpgsmenc = GST_RTP_GSM_ENC (object);
+
+  switch (prop_id) {
+    default:
+      break;
+  }
+}
+
+static void
+gst_rtpgsmenc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
+  rtpgsmenc = GST_RTP_GSM_ENC (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstElementStateReturn
+gst_rtpgsmenc_change_state (GstElement * element)
+{
+  GstRtpGSMEnc *rtpgsmenc;
+
+  g_return_val_if_fail (GST_IS_RTP_GSM_ENC (element), GST_STATE_FAILURE);
+
+  rtpgsmenc = GST_RTP_GSM_ENC (element);
+
+  GST_DEBUG (0, "state pending %d\n", GST_STATE_PENDING (element));
+
+  /* if going down into NULL state, close the file if it's open */
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_NULL_TO_READY:
+      break;
+
+    case GST_STATE_READY_TO_NULL:
+      break;
+
+    default:
+      break;
+  }
+
+  /* if we haven't failed already, give the parent class a chance to ;-) */
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
+
+gboolean
+gst_rtpgsmenc_plugin_init (GModule * module, GstPlugin * plugin)
+{
+  GstElementFactory *rtpgsmenc;
+
+  rtpgsmenc = gst_element_factory_new ("rtpgsmenc", GST_TYPE_RTP_GSM_ENC, &gst_rtpgsmenc_details);
+  g_return_val_if_fail (rtpgsmenc != NULL, FALSE);
+
+  gst_element_factory_add_pad_template (rtpgsmenc, GST_PAD_TEMPLATE_GET (sink_factory));
+  gst_element_factory_add_pad_template (rtpgsmenc, GST_PAD_TEMPLATE_GET (src_factory));
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (rtpgsmenc));
+
+  return TRUE;
+}

gst/rtp/gstrtpgsmpay.h

@@ -0,0 +1,79 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#ifndef __GST_RTP_GSM_ENC_H__
+#define __GST_RTP_GSM_ENC_H__
+
+#include <gst/gst.h>
+#include "rtp-packet.h"
+#include "gstrtp-common.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif				/* __cplusplus */
+
+/* Definition of structure storing data for this element. */
+typedef struct _GstRtpGSMEnc GstRtpGSMEnc;
+struct _GstRtpGSMEnc
+{
+  GstElement element;
+
+  GstPad *sinkpad;
+  GstPad *srcpad;
+
+  guint frequency;
+
+  /* the timestamp of the next frame */
+  guint64 next_time;
+  /* the interval between frames */
+  guint64 time_interval;
+  
+  guint32 ssrc;
+  guint16 seq;
+};
+
+/* Standard definition defining a class for this element. */
+typedef struct _GstRtpGSMEncClass GstRtpGSMEncClass;
+struct _GstRtpGSMEncClass
+{
+  GstElementClass parent_class;
+};
+
+/* Standard macros for defining types for this element.  */
+#define GST_TYPE_RTP_GSM_ENC \
+  (gst_rtpgsmenc_get_type())
+#define GST_RTP_GSM_ENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_GSM_ENC,GstRtpGSMEnc))
+#define GST_RTP_GSM_ENC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_GSM_ENC,GstRtpGSMEnc))
+#define GST_IS_RTP_GSM_ENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_GSM_ENC))
+#define GST_IS_RTP_GSM_ENC_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_GSM_ENC))
+
+gboolean gst_rtpgsmenc_plugin_init (GModule * module, GstPlugin * plugin);
+
+#ifdef __cplusplus
+}
+#endif				/* __cplusplus */
+
+
+#endif				/* __GST_RTP_GSM_ENC_H__ */

gst/rtp/rtp-packet.c

@@ -93,7 +93,7 @@ rtp_packet_free(Rtp_Packet packet)
   g_free(packet);
 }
 
-Rtp_Packet
+/*Rtp_Packet
 rtp_packet_read(int fd, struct sockaddr *fromaddr, socklen_t *fromlen)
 {
   int packlen;
@@ -105,14 +105,14 @@ rtp_packet_read(int fd, struct sockaddr *fromaddr, socklen_t *fromlen)
 
   if (packlen < 0) {
     g_error("rtp_packet_read: recvfrom: %d %s", errno, strerror(errno));
-    /*exit(1);*/
+    //exit(1);
     return NULL;
   }
 
   return rtp_packet_new_take_data(buf, packlen);
-}
+}*/
 
-void
+/*void
 rtp_packet_send(Rtp_Packet packet, int fd, struct sockaddr *toaddr, socklen_t tolen)
 {
   g_return_if_fail(packet != NULL);
@@ -120,7 +120,7 @@ rtp_packet_send(Rtp_Packet packet, int fd, struct sockaddr *toaddr, socklen_t to
   sendto(fd, (void *) packet -> data,
          packet -> data_len, 0,
 	 toaddr, tolen);
-}
+}*/
 
 guint8
 rtp_packet_get_version(Rtp_Packet packet)

gst/rtp/rtp-packet.h

@@ -22,9 +22,7 @@
 #ifndef _RTP_PACKET_H
 #define _RTP_PACKET_H 1
 
-#include <netinet/in.h>
 #include <sys/types.h>
-#include <sys/socket.h>
 #include <glib.h>
 
 #ifdef __sun
@@ -35,11 +33,9 @@
 extern "C" {
 #endif
 
-enum {
+#define RTP_VERSION 2
-  RTP_VERSION = 2,
+#define RTP_HEADER_LEN 12
-  RTP_HEADER_LEN = 12,
+#define RTP_MTU 2048
-  RTP_MTU = 2048
-};
 
 typedef struct Rtp_Header *Rtp_Header;
 
@@ -79,8 +75,8 @@ Rtp_Packet rtp_packet_new_copy_data(gpointer data, guint data_len);
 Rtp_Packet rtp_packet_new_allocate(guint payload_len,
                                    guint pad_len, guint csrc_count);
 void rtp_packet_free(Rtp_Packet packet);
-Rtp_Packet rtp_packet_read(int fd, struct sockaddr *fromaddr, socklen_t *fromlen);
+//Rtp_Packet rtp_packet_read(int fd, struct sockaddr *fromaddr, socklen_t *fromlen);
-void rtp_packet_send(Rtp_Packet packet, int fd, struct sockaddr *toaddr, socklen_t tolen);
+//void rtp_packet_send(Rtp_Packet packet, int fd, struct sockaddr *toaddr, socklen_t tolen);
 guint8 rtp_packet_get_version(Rtp_Packet packet);
 void rtp_packet_set_version(Rtp_Packet packet, guint8 version);
 guint8 rtp_packet_get_padding(Rtp_Packet packet);