gst/rtp/: Added G726 pay/depayloaders. Fixes #538891.

Original commit message from CVS:
Patch by: mersad <mersad at axis dot com>
* gst/rtp/Makefile.am:
* gst/rtp/gstrtp.c: (plugin_init):
* gst/rtp/gstrtpg726depay.c: (gst_rtp_g726_depay_base_init),
(gst_rtp_g726_depay_class_init), (gst_rtp_g726_depay_init),
(gst_rtp_g726_depay_setcaps), (gst_rtp_g726_depay_process),
(gst_rtp_g726_depay_plugin_init):
* gst/rtp/gstrtpg726depay.h:
* gst/rtp/gstrtpg726pay.c: (gst_rtp_g726_pay_base_init),
(gst_rtp_g726_pay_class_init), (gst_rtp_g726_pay_init),
(gst_rtp_g726_pay_setcaps), (gst_rtp_g726_pay_plugin_init):
* gst/rtp/gstrtpg726pay.h:
Added G726 pay/depayloaders. Fixes #538891.

1 files changed, 207 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpg726depay.c b/gst/rtp/gstrtpg726depay.c
new file mode 100644
index 00000000..cedcd7da
--- /dev/null
+++ b/gst/rtp/gstrtpg726depay.c
@@ -0,0 +1,207 @@
+/* GStreamer
+ * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2005 Edgard Lima <edgard.lima@indt.org.br>
+ * Copyright (C) 2005 Zeeshan Ali <zeenix@gmail.com>
+ * Copyright (C) 2008 Axis Communications <dev-gstreamer@axis.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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <gst/rtp/gstrtpbuffer.h>
+
+#include "gstrtpg726depay.h"
+
+#define DEFAULT_BIT_RATE 32000
+#define SAMPLE_RATE 8000
+#define LAYOUT_G726 "g726"
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_g726depay_details =
+GST_ELEMENT_DETAILS ("RTP packet depayloader",
+    "Codec/Depayloader/Network",
+    "Extracts G.726 audio from RTP packets",
+    "Axis Communications <dev-gstreamer@axis.com>");
+
+/* RtpG726Depay signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0
+};
+
+static GstStaticPadTemplate gst_rtp_g726_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 ", "
+        "encoding-name = (string) { \"G726\", \"G726-16\", \"G726-24\", \"G726-32\", \"G726-40\"}, "
+        "clock-rate = (int) 8000;")
+    );
+
+static GstStaticPadTemplate gst_rtp_g726_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-adpcm, "
+        "channels = (int) 1, "
+        "rate = (int) 8000, "
+        "bitrate = (int) { 16000, 24000, 32000, 40000 }, "
+        "layout = (string) \"g726\"")
+    );
+
+static GstBuffer *gst_rtp_g726_depay_process (GstBaseRTPDepayload * depayload,
+    GstBuffer * buf);
+static gboolean gst_rtp_g726_depay_setcaps (GstBaseRTPDepayload * depayload,
+    GstCaps * caps);
+
+GST_BOILERPLATE (GstRtpG726Depay, gst_rtp_g726_depay, GstBaseRTPDepayload,
+    GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static void
+gst_rtp_g726_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_g726_depay_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_g726_depay_sink_template));
+  gst_element_class_set_details (element_class, &gst_rtp_g726depay_details);
+}
+
+static void
+gst_rtp_g726_depay_class_init (GstRtpG726DepayClass * 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_g726_depay_process;
+  gstbasertpdepayload_class->set_caps = gst_rtp_g726_depay_setcaps;
+}
+
+static void
+gst_rtp_g726_depay_init (GstRtpG726Depay * rtpG726depay,
+    GstRtpG726DepayClass * klass)
+{
+  GstBaseRTPDepayload *depayload;
+
+  depayload = GST_BASE_RTP_DEPAYLOAD (rtpG726depay);
+
+  gst_pad_use_fixed_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload));
+}
+
+static gboolean
+gst_rtp_g726_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
+{
+  GstCaps *srccaps;
+  GstStructure *structure;
+  gboolean ret;
+  gint clock_rate = 8000;       /* default */
+  const gchar *encoding_name;
+  gint bitrate;
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  gst_structure_get_int (structure, "clock-rate", &clock_rate);
+  depayload->clock_rate = clock_rate;
+
+  encoding_name = gst_structure_get_string (structure, "encoding-name");
+  if (encoding_name == NULL || g_ascii_strcasecmp (encoding_name, "G726") == 0) {
+    bitrate = DEFAULT_BIT_RATE;
+  } else if (g_ascii_strcasecmp (encoding_name, "G726-16") == 0) {
+    bitrate = 16000;
+  } else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) {
+    bitrate = 24000;
+  } else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) {
+    bitrate = 32000;
+  } else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) {
+    bitrate = 40000;
+  } else {
+    GST_WARNING ("Could not determine bitrate from encoding-name (%s)",
+        encoding_name);
+    ret = FALSE;
+    goto done;
+  }
+  GST_DEBUG ("RTP G.726 depayloader, bitrate set to %d\n", bitrate);
+
+  srccaps = gst_caps_new_simple ("audio/x-adpcm",
+      "channels", G_TYPE_INT, 1,
+      "rate", G_TYPE_INT, clock_rate,
+      "bitrate", G_TYPE_INT, bitrate,
+      "layout", G_TYPE_STRING, LAYOUT_G726, NULL);
+
+  ret = gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), srccaps);
+  gst_caps_unref (srccaps);
+
+done:
+  return ret;
+}
+
+
+static GstBuffer *
+gst_rtp_g726_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+  GstCaps *srccaps;
+  GstBuffer *outbuf = NULL;
+
+  GST_DEBUG ("process : got %d bytes, mark %d ts %u seqn %d",
+      GST_BUFFER_SIZE (buf),
+      gst_rtp_buffer_get_marker (buf),
+      gst_rtp_buffer_get_timestamp (buf), gst_rtp_buffer_get_seq (buf));
+
+  srccaps = GST_PAD_CAPS (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload));
+  if (!srccaps) {
+    /* Set the default caps */
+    srccaps = gst_caps_new_simple ("audio/x-adpcm",
+        "channels", G_TYPE_INT, 1,
+        "rate", G_TYPE_INT, SAMPLE_RATE,
+        "bitrate", G_TYPE_INT, DEFAULT_BIT_RATE,
+        "layout", G_TYPE_STRING, LAYOUT_G726, NULL);
+    gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), srccaps);
+    gst_caps_unref (srccaps);
+  }
+  outbuf = gst_rtp_buffer_get_payload_buffer (buf);
+
+  return outbuf;
+}
+
+gboolean
+gst_rtp_g726_depay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpg726depay",
+      GST_RANK_MARGINAL, GST_TYPE_RTP_G726_DEPAY);
+}