gst/rtp/: Added G729 pay and depayloaders. Fixes #532409.

Original commit message from CVS:
Based on patch by: Olivier Crete <tester at tester dot ca>
* gst/rtp/Makefile.am:
* gst/rtp/gstrtp.c: (plugin_init):
* gst/rtp/gstrtpg729depay.c: (gst_rtp_g729_depay_base_init),
(gst_rtp_g729_depay_class_init), (gst_rtp_g729_depay_init),
(gst_rtp_g729_depay_setcaps), (gst_rtp_g729_depay_process),
(gst_rtp_g729_depay_plugin_init):
* gst/rtp/gstrtpg729depay.h:
* gst/rtp/gstrtpg729pay.c: (gst_rtpg729pay_base_init),
(gst_rtpg729pay_class_init), (gst_rtpg729pay_init),
(gst_rtpg729pay_setcaps), (gst_rtp_g729_pay_plugin_init):
* gst/rtp/gstrtpg729pay.h:
Added G729 pay and depayloaders. Fixes #532409.

1 files changed, 240 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpg729depay.c b/gst/rtp/gstrtpg729depay.c
new file mode 100644
index 00000000..977b6bcf
--- /dev/null
+++ b/gst/rtp/gstrtpg729depay.c
@@ -0,0 +1,240 @@
+/* GStreamer
+ *
+ * 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 "gstrtpg729depay.h"
+
+/* references:
+ *
+ * RFC 3551 (4.5.6)
+ */
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_g729depay_details =
+GST_ELEMENT_DETAILS ("RTP packet depayloader",
+    "Codec/Depayloader/Network",
+    "Extracts G729 audio from RTP packets (RFC 3551)",
+    "Laurent Glayal <spglegle@yahoo.fr>");
+
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0
+};
+
+/* input is an RTP packet
+ *
+ */
+static GstStaticPadTemplate gst_rtp_g729_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) \"G729\", "
+        "application/x-rtp, "
+        "media = (string) \"audio\", "
+        "payload = (int) " GST_RTP_PAYLOAD_G729_STRING ", "
+        "clock-rate = (int) 8000")
+    );
+
+static GstStaticPadTemplate gst_rtp_g729_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/G729, " "channels = (int) 1," "rate = (int) 8000")
+    );
+
+static gboolean gst_rtp_g729_depay_setcaps (GstBaseRTPDepayload * depayload,
+    GstCaps * caps);
+static GstBuffer *gst_rtp_g729_depay_process (GstBaseRTPDepayload * depayload,
+    GstBuffer * buf);
+
+GST_BOILERPLATE (GstRtpG729Depay, gst_rtp_g729_depay, GstBaseRTPDepayload,
+    GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static void
+gst_rtp_g729_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_g729_depay_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_g729_depay_sink_template));
+
+  gst_element_class_set_details (element_class, &gst_rtp_g729depay_details);
+}
+
+static void
+gst_rtp_g729_depay_class_init (GstRtpG729DepayClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+  GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+  gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  gstbasertpdepayload_class->process = gst_rtp_g729_depay_process;
+  gstbasertpdepayload_class->set_caps = gst_rtp_g729_depay_setcaps;
+}
+
+static void
+gst_rtp_g729_depay_init (GstRtpG729Depay * rtpg729depay,
+    GstRtpG729DepayClass * klass)
+{
+  GstBaseRTPDepayload *depayload;
+
+  depayload = GST_BASE_RTP_DEPAYLOAD (rtpg729depay);
+
+  depayload->clock_rate = 8000;
+  gst_pad_use_fixed_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload));
+}
+
+static gboolean
+gst_rtp_g729_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
+{
+  GstStructure *structure;
+  GstCaps *srccaps;
+  GstRtpG729Depay *rtpg729depay;
+  const gchar *params;
+  gint clock_rate, channels;
+  gboolean ret;
+
+  rtpg729depay = GST_RTP_G729_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;
+
+  srccaps = gst_caps_new_simple ("audio/G729",
+      "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);
+
+  rtpg729depay->negotiated = ret;
+
+  return ret;
+
+  /* ERRORS */
+wrong_channels:
+  {
+    GST_DEBUG_OBJECT (rtpg729depay, "expected 1 channel, got %d",
+        rtpg729depay->channels);
+    return FALSE;
+  }
+wrong_clock_rate:
+  {
+    GST_DEBUG_OBJECT (rtpg729depay, "expected 8000 clock-rate, got %d",
+        clock_rate);
+    return FALSE;
+  }
+}
+
+
+static GstBuffer *
+gst_rtp_g729_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+  GstRtpG729Depay *rtpg729depay;
+  GstBuffer *outbuf = NULL;
+  gint payload_len;
+
+  rtpg729depay = GST_RTP_G729_DEPAY (depayload);
+
+  if (!rtpg729depay->negotiated)
+    goto not_negotiated;
+
+  if (!gst_rtp_buffer_validate (buf)) {
+    GST_ELEMENT_WARNING (rtpg729depay, STREAM, DECODE,
+        (NULL), ("G729 RTP packet did not validate"));
+    goto bad_packet;
+  }
+
+  payload_len = gst_rtp_buffer_get_payload_len (buf);
+
+  /* At least 2 bytes (CNG from G729 Annex B) */
+  if (payload_len < 2) {
+    GST_ELEMENT_WARNING (rtpg729depay, STREAM, DECODE,
+        (NULL), ("G729 RTP payload too small (%d)", payload_len));
+    goto bad_packet;
+  }
+
+  GST_DEBUG_OBJECT (rtpg729depay, "payload len %d", payload_len);
+
+  if ((payload_len % 10) == 2) {
+    GST_DEBUG_OBJECT (rtpg729depay, "G729 payload contains CNG frame");
+  }
+
+  outbuf = gst_rtp_buffer_get_payload_buffer (buf);
+
+  GST_DEBUG ("gst_rtp_g729_depay_chain: pushing buffer of size %d",
+      GST_BUFFER_SIZE (outbuf));
+
+  return outbuf;
+
+  /* ERRORS */
+not_negotiated:
+  {
+    GST_ELEMENT_ERROR (rtpg729depay, STREAM, NOT_IMPLEMENTED,
+        (NULL), ("not negotiated"));
+    return NULL;
+  }
+bad_packet:
+  {
+    /* no fatal error */
+    return NULL;
+  }
+}
+
+gboolean
+gst_rtp_g729_depay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpg729depay",
+      GST_RANK_MARGINAL, GST_TYPE_RTP_G729_DEPAY);
+}