GSM -> RTP and viceversa

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

1 files changed, 295 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpgsmdepay.c b/gst/rtp/gstrtpgsmdepay.c
new file mode 100644
index 00000000..814cc680
--- /dev/null
+++ b/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;
+}