rtpg723depay: add G723 depayloader

4 files changed, 295 insertions, 0 deletions

diff --git a/gst/rtp/Makefile.am b/gst/rtp/Makefile.am
index af7d27835..51796715a 100644
--- a/gst/rtp/Makefile.am
+++ b/gst/rtp/Makefile.am
@@ -22,6 +22,7 @@ libgstrtp_la_SOURCES = \
 	gstrtppcmudepay.c \
 	gstrtppcmupay.c \
 	gstrtppcmapay.c \
+	gstrtpg723depay.c \
 	gstrtpg723pay.c \
 	gstrtpg726pay.c \
 	gstrtpg726depay.c \
@@ -102,6 +103,7 @@ noinst_HEADERS =			\
 		 gstrtppcmudepay.h	\
 		 gstrtppcmupay.h 	\
 		 gstrtppcmapay.h 	\
+	         gstrtpg723depay.h      \
 	         gstrtpg723pay.h        \
 	         gstrtpg726depay.h      \
 	         gstrtpg726pay.h        \
diff --git a/gst/rtp/gstrtp.c b/gst/rtp/gstrtp.c
index 68d9854d9..05bb5e384 100644
--- a/gst/rtp/gstrtp.c
+++ b/gst/rtp/gstrtp.c
@@ -35,6 +35,7 @@
 #include "gstrtppcmapay.h"
 #include "gstrtppcmadepay.h"
 #include "gstrtppcmudepay.h"
+#include "gstrtpg723depay.h"
 #include "gstrtpg723pay.h"
 #include "gstrtpg726depay.h"
 #include "gstrtpg726pay.h"
@@ -116,6 +117,9 @@ plugin_init (GstPlugin * plugin)
   if (!gst_rtp_ilbc_depay_plugin_init (plugin))
     return FALSE;
 
+  if (!gst_rtp_g723_depay_plugin_init (plugin))
+    return FALSE;
+
   if (!gst_rtp_g723_pay_plugin_init (plugin))
     return FALSE;
 
diff --git a/gst/rtp/gstrtpg723depay.c b/gst/rtp/gstrtpg723depay.c
new file mode 100644
index 000000000..a7e81c7d7
--- /dev/null
+++ b/gst/rtp/gstrtpg723depay.c
@@ -0,0 +1,232 @@
+/* GStreamer
+ *
+ * Copyright (C) <2010> 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <gst/rtp/gstrtpbuffer.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include "gstrtpg723depay.h"
+
+GST_DEBUG_CATEGORY_STATIC (rtpg723depay_debug);
+#define GST_CAT_DEFAULT (rtpg723depay_debug)
+
+
+/* references:
+ *
+ * RFC 3551 (4.5.3)
+ */
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_g723depay_details =
+GST_ELEMENT_DETAILS ("RTP G.723 depayloader",
+    "Codec/Depayloader/Network",
+    "Extracts G.723 audio from RTP packets (RFC 3551)",
+    "Wim Taymans <wim.taymans@gmail.com>");
+
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0
+};
+
+/* input is an RTP packet
+ *
+ */
+static GstStaticPadTemplate gst_rtp_g723_depay_sink_template =
+    GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/x-rtp, "
+        "media = (string) \"audio\", "
+        "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
+        "clock-rate = (int) 8000, "
+        "encoding-name = (string) \"G723\"; "
+        "application/x-rtp, "
+        "media = (string) \"audio\", "
+        "payload = (int) " GST_RTP_PAYLOAD_G723_STRING ", "
+        "clock-rate = (int) 8000")
+    );
+
+static GstStaticPadTemplate gst_rtp_g723_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/G723, " "channels = (int) 1," "rate = (int) 8000")
+    );
+
+static gboolean gst_rtp_g723_depay_setcaps (GstBaseRTPDepayload * depayload,
+    GstCaps * caps);
+static GstBuffer *gst_rtp_g723_depay_process (GstBaseRTPDepayload * depayload,
+    GstBuffer * buf);
+
+GST_BOILERPLATE (GstRtpG723Depay, gst_rtp_g723_depay, GstBaseRTPDepayload,
+    GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static void
+gst_rtp_g723_depay_base_init (gpointer klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_g723_depay_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_g723_depay_sink_template));
+
+  gst_element_class_set_details (element_class, &gst_rtp_g723depay_details);
+
+  GST_DEBUG_CATEGORY_INIT (rtpg723depay_debug, "rtpg723depay", 0,
+      "G.723 RTP Depayloader");
+}
+
+static void
+gst_rtp_g723_depay_class_init (GstRtpG723DepayClass * klass)
+{
+  GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
+
+  gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
+
+  gstbasertpdepayload_class->process = gst_rtp_g723_depay_process;
+  gstbasertpdepayload_class->set_caps = gst_rtp_g723_depay_setcaps;
+}
+
+static void
+gst_rtp_g723_depay_init (GstRtpG723Depay * rtpg723depay,
+    GstRtpG723DepayClass * klass)
+{
+  GstBaseRTPDepayload *depayload;
+
+  depayload = GST_BASE_RTP_DEPAYLOAD (rtpg723depay);
+
+  gst_pad_use_fixed_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload));
+}
+
+static gboolean
+gst_rtp_g723_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
+{
+  GstStructure *structure;
+  GstCaps *srccaps;
+  GstRtpG723Depay *rtpg723depay;
+  const gchar *params;
+  gint clock_rate, channels;
+  gboolean ret;
+
+  rtpg723depay = GST_RTP_G723_DEPAY (depayload);
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  if (!(params = gst_structure_get_string (structure, "encoding-params")))
+    channels = 1;
+  else {
+    channels = atoi (params);
+  }
+
+  if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
+    clock_rate = 8000;
+
+  if (channels != 1)
+    goto wrong_channels;
+
+  if (clock_rate != 8000)
+    goto wrong_clock_rate;
+
+  depayload->clock_rate = clock_rate;
+
+  srccaps = gst_caps_new_simple ("audio/G723",
+      "channels", G_TYPE_INT, channels, "rate", G_TYPE_INT, clock_rate, NULL);
+  ret = gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), srccaps);
+  gst_caps_unref (srccaps);
+
+  return ret;
+
+  /* ERRORS */
+wrong_channels:
+  {
+    GST_DEBUG_OBJECT (rtpg723depay, "expected 1 channel, got %d", channels);
+    return FALSE;
+  }
+wrong_clock_rate:
+  {
+    GST_DEBUG_OBJECT (rtpg723depay, "expected 8000 clock-rate, got %d",
+        clock_rate);
+    return FALSE;
+  }
+}
+
+
+static GstBuffer *
+gst_rtp_g723_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+  GstRtpG723Depay *rtpg723depay;
+  GstBuffer *outbuf = NULL;
+  gint payload_len;
+  gboolean marker;
+
+  rtpg723depay = GST_RTP_G723_DEPAY (depayload);
+
+  payload_len = gst_rtp_buffer_get_payload_len (buf);
+
+  /* At least 4 bytes */
+  if (payload_len < 4)
+    goto too_small;
+
+  GST_LOG_OBJECT (rtpg723depay, "payload len %d", payload_len);
+
+  outbuf = gst_rtp_buffer_get_payload_buffer (buf);
+  marker = gst_rtp_buffer_get_marker (buf);
+
+  if (marker) {
+    /* marker bit starts talkspurt */
+    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
+  }
+
+  GST_LOG_OBJECT (depayload, "pushing buffer of size %d",
+      GST_BUFFER_SIZE (outbuf));
+
+  return outbuf;
+
+  /* ERRORS */
+too_small:
+  {
+    GST_ELEMENT_WARNING (rtpg723depay, STREAM, DECODE,
+        (NULL), ("G723 RTP payload too small (%d)", payload_len));
+    goto bad_packet;
+  }
+bad_packet:
+  {
+    /* no fatal error */
+    return NULL;
+  }
+}
+
+gboolean
+gst_rtp_g723_depay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpg723depay",
+      GST_RANK_MARGINAL, GST_TYPE_RTP_G723_DEPAY);
+}
diff --git a/gst/rtp/gstrtpg723depay.h b/gst/rtp/gstrtpg723depay.h
new file mode 100644
index 000000000..b07ad670d
--- /dev/null
+++ b/gst/rtp/gstrtpg723depay.h
@@ -0,0 +1,57 @@
+/* GStreamer
+ *
+ * Copyright (C) <2010> 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_RTP_G723_DEPAY_H__
+#define __GST_RTP_G723_DEPAY_H__
+
+#include <gst/gst.h>
+#include <gst/rtp/gstbasertpdepayload.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_RTP_G723_DEPAY \
+  (gst_rtp_g723_depay_get_type())
+#define GST_RTP_G723_DEPAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_G723_DEPAY,GstRtpG723Depay))
+#define GST_RTP_G723_DEPAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_G723_DEPAY,GstRtpG723DepayClass))
+#define GST_IS_RTP_G723_DEPAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_G723_DEPAY))
+#define GST_IS_RTP_G723_DEPAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_G723_DEPAY))
+
+typedef struct _GstRtpG723Depay GstRtpG723Depay;
+typedef struct _GstRtpG723DepayClass GstRtpG723DepayClass;
+
+struct _GstRtpG723Depay
+{
+  GstBaseRTPDepayload depayload;
+};
+
+struct _GstRtpG723DepayClass
+{
+  GstBaseRTPDepayloadClass parent_class;
+};
+
+gboolean gst_rtp_g723_depay_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_RTP_G723_DEPAY_H__ */