celtdepay: add CELT depayloader

gst/rtp/Makefile.am

@@ -6,6 +6,7 @@ libgstrtp_la_SOURCES = \
 	gstrtpchannels.c \
 	gstrtpdepay.c \
 	gstrtpac3depay.c \
+	gstrtpceltdepay.c \
 	gstrtpceltpay.c \
 	gstrtpdvdepay.c \
 	gstrtpdvpay.c \

gst/rtp/gstrtp.c

@@ -23,6 +23,7 @@
 
 #include "gstrtpdepay.h"
 #include "gstrtpac3depay.h"
+#include "gstrtpceltdepay.h"
 #include "gstrtpceltpay.h"
 #include "gstrtpdvdepay.h"
 #include "gstrtpdvpay.h"
@@ -87,6 +88,9 @@ plugin_init (GstPlugin * plugin)
   if (!gst_rtp_ac3_depay_plugin_init (plugin))
     return FALSE;
 
+  if (!gst_rtp_celt_depay_plugin_init (plugin))
+    return FALSE;
+
   if (!gst_rtp_celt_pay_plugin_init (plugin))
     return FALSE;
 

gst/rtp/gstrtpceltdepay.c

@@ -0,0 +1,242 @@
+/* GStreamer
+ * Copyright (C) <2009> 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 <string.h>
+#include <stdlib.h>
+#include <gst/rtp/gstrtpbuffer.h>
+
+#include "gstrtpceltdepay.h"
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_celtdepay_details =
+GST_ELEMENT_DETAILS ("RTP CELT depayloader",
+    "Codec/Depayloader/Network",
+    "Extracts CELT audio from RTP packets",
+    "Wim Taymans <wim.taymans@gmail.com>");
+
+/* RtpCELTDepay signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0
+};
+
+static GstStaticPadTemplate gst_rtp_celt_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) [32000, 48000], "
+        "encoding-name = (string) \"CELT\"")
+    );
+
+static GstStaticPadTemplate gst_rtp_celt_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-celt")
+    );
+
+static GstBuffer *gst_rtp_celt_depay_process (GstBaseRTPDepayload * depayload,
+    GstBuffer * buf);
+static gboolean gst_rtp_celt_depay_setcaps (GstBaseRTPDepayload * depayload,
+    GstCaps * caps);
+
+GST_BOILERPLATE (GstRtpCELTDepay, gst_rtp_celt_depay, GstBaseRTPDepayload,
+    GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static void
+gst_rtp_celt_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_celt_depay_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_celt_depay_sink_template));
+  gst_element_class_set_details (element_class, &gst_rtp_celtdepay_details);
+}
+
+static void
+gst_rtp_celt_depay_class_init (GstRtpCELTDepayClass * klass)
+{
+  GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
+
+  gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
+
+  gstbasertpdepayload_class->process = gst_rtp_celt_depay_process;
+  gstbasertpdepayload_class->set_caps = gst_rtp_celt_depay_setcaps;
+}
+
+static void
+gst_rtp_celt_depay_init (GstRtpCELTDepay * rtpceltdepay,
+    GstRtpCELTDepayClass * klass)
+{
+}
+
+/* len 4 bytes LE,
+ * vendor string (len bytes),
+ * user_len 4 (0) bytes LE
+ */
+static const gchar gst_rtp_celt_comment[] =
+    "\045\0\0\0Depayloaded with GStreamer celtdepay\0\0\0\0";
+
+static gboolean
+gst_rtp_celt_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
+{
+  GstStructure *structure;
+  GstRtpCELTDepay *rtpceltdepay;
+  gint clock_rate, nb_channels, frame_size;
+  GstBuffer *buf;
+  guint8 *data;
+  const gchar *params;
+  GstCaps *srccaps;
+  gboolean res;
+
+  rtpceltdepay = GST_RTP_CELT_DEPAY (depayload);
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
+    goto no_clockrate;
+  depayload->clock_rate = clock_rate;
+
+  if (!(params = gst_structure_get_string (structure, "encoding-params")))
+    nb_channels = 1;
+  else {
+    nb_channels = atoi (params);
+  }
+
+  if (!(params = gst_structure_get_string (structure, "frame-size")))
+    frame_size = 480;
+  else {
+    frame_size = atoi (params);
+  }
+
+  /* construct minimal header and comment packet for the decoder */
+  buf = gst_buffer_new_and_alloc (60);
+  data = GST_BUFFER_DATA (buf);
+  memcpy (data, "CELT    ", 8);
+  data += 8;
+  memcpy (data, "1.1.12", 7);
+  data += 20;
+  GST_WRITE_UINT32_LE (data, 0x80000006);       /* version */
+  data += 4;
+  GST_WRITE_UINT32_LE (data, 56);       /* header_size */
+  data += 4;
+  GST_WRITE_UINT32_LE (data, clock_rate);       /* rate */
+  data += 4;
+  GST_WRITE_UINT32_LE (data, nb_channels);      /* channels */
+  data += 4;
+  GST_WRITE_UINT32_LE (data, frame_size);       /* frame-size */
+  data += 4;
+  GST_WRITE_UINT32_LE (data, -1);       /* overlap */
+  data += 4;
+  GST_WRITE_UINT32_LE (data, -1);       /* bytes_per_packet */
+  data += 4;
+  GST_WRITE_UINT32_LE (data, 0);        /* extra headers */
+
+  srccaps = gst_caps_new_simple ("audio/x-celt", NULL);
+  res = gst_pad_set_caps (depayload->srcpad, srccaps);
+  gst_caps_unref (srccaps);
+
+  gst_buffer_set_caps (buf, GST_PAD_CAPS (depayload->srcpad));
+  gst_base_rtp_depayload_push (GST_BASE_RTP_DEPAYLOAD (rtpceltdepay), buf);
+
+  buf = gst_buffer_new_and_alloc (sizeof (gst_rtp_celt_comment));
+  memcpy (GST_BUFFER_DATA (buf), gst_rtp_celt_comment,
+      sizeof (gst_rtp_celt_comment));
+
+  gst_buffer_set_caps (buf, GST_PAD_CAPS (depayload->srcpad));
+  gst_base_rtp_depayload_push (GST_BASE_RTP_DEPAYLOAD (rtpceltdepay), buf);
+
+  return res;
+
+  /* ERRORS */
+no_clockrate:
+  {
+    GST_DEBUG_OBJECT (depayload, "no clock-rate specified");
+    return FALSE;
+  }
+}
+
+static GstBuffer *
+gst_rtp_celt_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+  GstBuffer *outbuf = NULL;
+  guint8 *payload;
+  guint offset, pos, payload_len, total_size, size;
+  guint8 s;
+
+  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));
+
+  payload = gst_rtp_buffer_get_payload (buf);
+  payload_len = gst_rtp_buffer_get_payload_len (buf);
+
+  /* first count how many bytes are consumed by the size headers and make offset
+   * point to the first data byte */
+  total_size = 0;
+  offset = 0;
+  while (total_size < payload_len) {
+    size = 0;
+    do {
+      s = payload[offset++];
+      total_size += s + 1;
+    } while (s == 0xff);
+  }
+
+  /* offset is now pointing to the payload */
+  total_size = 0;
+  pos = 0;
+  while (total_size < payload_len) {
+    size = 0;
+    do {
+      s = payload[pos++];
+      size += s;
+      total_size += size + 1;
+    } while (s == 0xff);
+
+    outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, offset, size);
+    offset += size;
+
+    gst_base_rtp_depayload_push (depayload, outbuf);
+  }
+  return NULL;
+}
+
+gboolean
+gst_rtp_celt_depay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpceltdepay",
+      GST_RANK_MARGINAL, GST_TYPE_RTP_CELT_DEPAY);
+}

gst/rtp/gstrtpceltdepay.h

@@ -0,0 +1,51 @@
+/* GStreamer
+ * Copyright (C) <2009> 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 
+ */
+ 
+#ifndef __GST_RTP_CELT_DEPAY_H__
+#define __GST_RTP_CELT_DEPAY_H__
+
+#include <gst/gst.h>
+#include <gst/rtp/gstbasertpdepayload.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GstRtpCELTDepay GstRtpCELTDepay;
+typedef struct _GstRtpCELTDepayClass GstRtpCELTDepayClass;
+
+#define GST_TYPE_RTP_CELT_DEPAY \
+  (gst_rtp_celt_depay_get_type())
+#define GST_RTP_CELT_DEPAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_CELT_DEPAY,GstRtpCELTDepay))
+#define GST_RTP_CELT_DEPAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_CELT_DEPAY,GstRtpCELTDepayClass))
+#define GST_IS_RTP_CELT_DEPAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_CELT_DEPAY))
+#define GST_IS_RTP_CELT_DEPAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_CELT_DEPAY))
+
+struct _GstRtpCELTDepay
+{
+  GstBaseRTPDepayload depayload;
+};
+
+struct _GstRtpCELTDepayClass
+{
+  GstBaseRTPDepayloadClass parent_class;
+};
+
+gboolean gst_rtp_celt_depay_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_RTP_CELT_DEPAY_H__ */