gst/rtp/: Add theora pay/depayloaders.

Original commit message from CVS:
* gst/rtp/Makefile.am:
* gst/rtp/gstrtp.c: (plugin_init):
* gst/rtp/gstrtptheoradepay.c: (gst_rtp_theora_depay_base_init),
(gst_rtp_theora_depay_class_init), (gst_rtp_theora_depay_init),
(gst_rtp_theora_depay_finalize),
(gst_rtp_theora_depay_parse_configuration),
(gst_rtp_theora_depay_setcaps),
(gst_rtp_theora_depay_switch_codebook),
(gst_rtp_theora_depay_process),
(gst_rtp_theora_depay_set_property),
(gst_rtp_theora_depay_get_property),
(gst_rtp_theora_depay_change_state),
(gst_rtp_theora_depay_plugin_init):
* gst/rtp/gstrtptheoradepay.h:
* gst/rtp/gstrtptheorapay.c: (gst_rtp_theora_pay_base_init),
(gst_rtp_theora_pay_class_init), (gst_rtp_theora_pay_init),
(gst_rtp_theora_pay_setcaps), (gst_rtp_theora_pay_reset_packet),
(gst_rtp_theora_pay_init_packet),
(gst_rtp_theora_pay_flush_packet),
(gst_rtp_theora_pay_finish_headers), (gst_rtp_theora_pay_parse_id),
(gst_rtp_theora_pay_handle_buffer),
(gst_rtp_theora_pay_plugin_init):
* gst/rtp/gstrtptheorapay.h:
Add theora pay/depayloaders.

1 files changed, 673 insertions, 0 deletions

diff --git a/gst/rtp/gstrtptheoradepay.c b/gst/rtp/gstrtptheoradepay.c
new file mode 100644
index 00000000..3f027ed0
--- /dev/null
+++ b/gst/rtp/gstrtptheoradepay.c
@@ -0,0 +1,673 @@
+/* GStreamer
+ * Copyright (C) <2006> Wim Taymans <wim@fluendo.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/tag/tag.h>
+#include <gst/rtp/gstrtpbuffer.h>
+
+#include <string.h>
+#include "gstrtptheoradepay.h"
+
+GST_DEBUG_CATEGORY_STATIC (rtptheoradepay_debug);
+#define GST_CAT_DEFAULT (rtptheoradepay_debug)
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_theora_depay_details =
+GST_ELEMENT_DETAILS ("RTP packet depayloader",
+    "Codec/Depayloader/Network",
+    "Extracts Theora video from RTP packets (draft-01 of RFC XXXX)",
+    "Wim Taymans <wim@fluendo.com>");
+
+/* RtpTheoraDepay signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+};
+
+static GstStaticPadTemplate gst_rtp_theora_depay_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/x-rtp, "
+        "media = (string) \"video\", "
+        "clock-rate = (int) [1, MAX ], " "encoding-name = (string) \"theora\""
+        /* All required parameters 
+         *
+         * "encoding-params = (string) <num channels>"
+         * "delivery-method = (string) { inline, in_band, out_band/<specific_name> } " 
+         * "configuration = (string) ANY" 
+         */
+        /* All optional parameters
+         *
+         * "configuration-uri =" 
+         */
+    )
+    );
+
+static GstStaticPadTemplate gst_rtp_theora_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-theora")
+    );
+
+/* 42 bytes for the theora identification packet length */
+#define THEORA_ID_LEN	42
+
+GST_BOILERPLATE (GstRtpTheoraDepay, gst_rtp_theora_depay, GstBaseRTPDepayload,
+    GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static gboolean gst_rtp_theora_depay_setcaps (GstBaseRTPDepayload * depayload,
+    GstCaps * caps);
+static GstBuffer *gst_rtp_theora_depay_process (GstBaseRTPDepayload * depayload,
+    GstBuffer * buf);
+
+static void gst_rtp_theora_depay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_rtp_theora_depay_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+static void gst_rtp_theora_depay_finalize (GObject * object);
+
+static GstStateChangeReturn gst_rtp_theora_depay_change_state (GstElement *
+    element, GstStateChange transition);
+
+
+static void
+gst_rtp_theora_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_theora_depay_sink_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_theora_depay_src_template));
+
+  gst_element_class_set_details (element_class, &gst_rtp_theora_depay_details);
+}
+
+static void
+gst_rtp_theora_depay_class_init (GstRtpTheoraDepayClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+  GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+  gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
+
+  gobject_class->set_property = gst_rtp_theora_depay_set_property;
+  gobject_class->get_property = gst_rtp_theora_depay_get_property;
+  gobject_class->finalize = gst_rtp_theora_depay_finalize;
+
+  gstelement_class->change_state = gst_rtp_theora_depay_change_state;
+
+  gstbasertpdepayload_class->process = gst_rtp_theora_depay_process;
+  gstbasertpdepayload_class->set_caps = gst_rtp_theora_depay_setcaps;
+
+  GST_DEBUG_CATEGORY_INIT (rtptheoradepay_debug, "rtptheoradepay", 0,
+      "Theora RTP Depayloader");
+}
+
+static void
+gst_rtp_theora_depay_init (GstRtpTheoraDepay * rtptheoradepay,
+    GstRtpTheoraDepayClass * klass)
+{
+  rtptheoradepay->adapter = gst_adapter_new ();
+}
+static void
+gst_rtp_theora_depay_finalize (GObject * object)
+{
+  GstRtpTheoraDepay *rtptheoradepay = GST_RTP_THEORA_DEPAY (object);
+
+  g_object_unref (rtptheoradepay->adapter);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static gboolean
+gst_rtp_theora_depay_parse_configuration (GstRtpTheoraDepay * rtptheoradepay,
+    const gchar * configuration)
+{
+  GValue v = { 0 };
+  GstBuffer *buf;
+  guint32 num_headers;
+  guint8 *data;
+  guint size;
+  gint i;
+
+  /* deserialize base16 to buffer */
+  g_value_init (&v, GST_TYPE_BUFFER);
+  if (!gst_value_deserialize (&v, configuration))
+    goto wrong_configuration;
+
+  buf = gst_value_get_buffer (&v);
+  gst_buffer_ref (buf);
+  g_value_unset (&v);
+
+  data = GST_BUFFER_DATA (buf);
+  size = GST_BUFFER_SIZE (buf);
+
+  GST_DEBUG_OBJECT (rtptheoradepay, "config size %u", size);
+
+  /* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |                     Number of packed headers                  |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |                          Packed header                        |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |                          Packed header                        |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |                          ....                                 |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   */
+  if (size < 4)
+    goto too_small;
+
+  num_headers = GST_READ_UINT32_BE (data);
+  size -= 4;
+  data += 4;
+
+  GST_DEBUG_OBJECT (rtptheoradepay, "have %u headers", num_headers);
+
+  /*  0                   1                   2                   3
+   *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |                   Ident                       |              ..
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * ..   length     |              Identification Header           ..
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * ..                    Identification Header                     |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |                          Setup Header                        ..
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * ..                         Setup Header                         |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   *
+   */
+  for (i = 0; i < num_headers; i++) {
+    guint32 ident;
+    guint16 length;
+    GstRtpTheoraConfig *conf;
+    GstTagList *list;
+
+    if (size < 5)
+      goto too_small;
+
+    ident = (data[0] << 16) | (data[1] << 8) | data[2];
+    length = (data[3] << 8) | data[4];
+    size -= 5;
+    data += 5;
+
+    GST_DEBUG_OBJECT (rtptheoradepay, "header %d, ident %08x, length %u", i,
+        ident, length);
+
+    if (size < length + THEORA_ID_LEN)
+      goto too_small;
+
+    GST_DEBUG_OBJECT (rtptheoradepay, "preparing headers");
+
+    conf = g_new0 (GstRtpTheoraConfig, 1);
+    conf->ident = ident;
+
+    buf = gst_buffer_new_and_alloc (THEORA_ID_LEN);
+    memcpy (GST_BUFFER_DATA (buf), data, THEORA_ID_LEN);
+    conf->headers = g_list_append (conf->headers, buf);
+    data += THEORA_ID_LEN;
+    size -= THEORA_ID_LEN;
+
+    /* create a dummy comment */
+    list = gst_tag_list_new ();
+    buf =
+        gst_tag_list_to_vorbiscomment_buffer (list, (guint8 *) "\201theora", 7,
+        "Theora RTP depayloader");
+    conf->headers = g_list_append (conf->headers, buf);
+    gst_tag_list_free (list);
+
+    buf = gst_buffer_new_and_alloc (length);
+    memcpy (GST_BUFFER_DATA (buf), data, length);
+    conf->headers = g_list_append (conf->headers, buf);
+    data += length;
+    size -= length;
+
+    rtptheoradepay->configs = g_list_append (rtptheoradepay->configs, conf);
+  }
+
+  return TRUE;
+
+  /* ERRORS */
+wrong_configuration:
+  {
+    GST_DEBUG_OBJECT (rtptheoradepay, "error parsing configuration");
+    return FALSE;
+  }
+too_small:
+  {
+    GST_DEBUG_OBJECT (rtptheoradepay, "configuration too small");
+    return FALSE;
+  }
+}
+
+static gboolean
+gst_rtp_theora_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
+{
+  GstStructure *structure;
+  GstRtpTheoraDepay *rtptheoradepay;
+  GstCaps *srccaps;
+  const gchar *delivery_method;
+  const gchar *configuration;
+  gint clock_rate;
+
+  rtptheoradepay = GST_RTP_THEORA_DEPAY (depayload);
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  /* get clockrate */
+  if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
+    goto no_rate;
+
+  /* see how the configuration parameters will be transmitted */
+  delivery_method = gst_structure_get_string (structure, "delivery-method");
+  if (delivery_method == NULL)
+    goto no_delivery_method;
+
+  if (g_strcasecmp (delivery_method, "inline")) {
+    /* configure string is in the caps */
+  } else if (g_strcasecmp (delivery_method, "in_band")) {
+    /* headers will (also) be transmitted in the RTP packets */
+  } else if (g_str_has_prefix (delivery_method, "out_band/")) {
+    /* some other method of header delivery. */
+    goto unsupported_delivery_method;
+  } else
+    goto unsupported_delivery_method;
+
+  /* read and parse configuration string */
+  configuration = gst_structure_get_string (structure, "configuration");
+  if (configuration == NULL)
+    goto no_configuration;
+
+  if (!gst_rtp_theora_depay_parse_configuration (rtptheoradepay, configuration))
+    goto invalid_configuration;
+
+  /* caps seem good, configure element */
+  depayload->clock_rate = clock_rate;
+
+  /* set caps on pad and on header */
+  srccaps = gst_caps_new_simple ("video/x-theora", NULL);
+  gst_pad_set_caps (depayload->srcpad, srccaps);
+  gst_caps_unref (srccaps);
+
+  return TRUE;
+
+  /* ERRORS */
+unsupported_delivery_method:
+  {
+    GST_ERROR_OBJECT (rtptheoradepay,
+        "unsupported delivery-method \"%s\" specified", delivery_method);
+    return FALSE;
+  }
+no_delivery_method:
+  {
+    GST_ERROR_OBJECT (rtptheoradepay, "no delivery-method specified");
+    return FALSE;
+  }
+no_configuration:
+  {
+    GST_ERROR_OBJECT (rtptheoradepay, "no configuration specified");
+    return FALSE;
+  }
+invalid_configuration:
+  {
+    GST_ERROR_OBJECT (rtptheoradepay, "invalid configuration specified");
+    return FALSE;
+  }
+no_rate:
+  {
+    GST_ERROR_OBJECT (rtptheoradepay, "no clock-rate specified");
+    return FALSE;
+  }
+}
+
+static gboolean
+gst_rtp_theora_depay_switch_codebook (GstRtpTheoraDepay * rtptheoradepay,
+    guint32 ident)
+{
+  GList *walk;
+  gboolean res = FALSE;
+
+  for (walk = rtptheoradepay->configs; walk; walk = g_list_next (walk)) {
+    GstRtpTheoraConfig *conf = (GstRtpTheoraConfig *) walk->data;
+
+    if (conf->ident == ident) {
+      GList *headers;
+
+      /* FIXME, remove pads, create new pad.. */
+
+      /* push out all the headers */
+      for (headers = conf->headers; headers; headers = g_list_next (headers)) {
+        GstBuffer *header = GST_BUFFER_CAST (headers->data);
+
+        gst_buffer_ref (header);
+        gst_base_rtp_depayload_push (GST_BASE_RTP_DEPAYLOAD (rtptheoradepay),
+            header);
+      }
+      /* remember the current config */
+      rtptheoradepay->config = conf;
+      res = TRUE;
+    }
+  }
+  if (!res) {
+    /* we don't know about the headers, figure out an alternative method for
+     * getting the codebooks. FIXME, fail for now. */
+  }
+  return res;
+}
+
+static GstBuffer *
+gst_rtp_theora_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+  GstRtpTheoraDepay *rtptheoradepay;
+  GstBuffer *outbuf;
+  GstFlowReturn ret;
+  gint payload_len;
+  guint8 *payload, *to_free = NULL;
+  guint32 timestamp;
+  guint32 header, ident;
+  guint8 F, TDT, packets;
+  gboolean free_payload;
+
+  rtptheoradepay = GST_RTP_THEORA_DEPAY (depayload);
+
+  if (!gst_rtp_buffer_validate (buf))
+    goto bad_packet;
+
+  payload_len = gst_rtp_buffer_get_payload_len (buf);
+
+  GST_DEBUG_OBJECT (depayload, "got RTP packet of size %d", payload_len);
+
+  /* we need at least 4 bytes for the packet header */
+  if (G_UNLIKELY (payload_len < 4))
+    goto packet_short;
+
+  payload = gst_rtp_buffer_get_payload (buf);
+  free_payload = FALSE;
+
+  header = GST_READ_UINT32_BE (payload);
+  /*
+   *  0                   1                   2                   3
+   *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |                     Ident                     | F |TDT|# pkts.|
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   *
+   * F: Fragment type (0=none, 1=start, 2=cont, 3=end)
+   * TDT: Theora data type (0=theora, 1=config, 2=comment, 3=reserved)
+   * pkts: number of packets.
+   */
+  TDT = (header & 0x30) >> 4;
+  if (G_UNLIKELY (TDT == 3))
+    goto ignore_reserved;
+
+  ident = (header >> 8) & 0xffffff;
+  F = (header & 0xc0) >> 6;
+  packets = (header & 0xf);
+
+  if (TDT == 0) {
+    gboolean do_switch = FALSE;
+
+    /* we have a raw payload, find the codebook for the ident */
+    if (!rtptheoradepay->config) {
+      /* we don't have an active codebook, find the codebook and
+       * activate it */
+      do_switch = TRUE;
+    } else if (rtptheoradepay->config->ident != ident) {
+      /* codebook changed */
+      do_switch = TRUE;
+    }
+    if (do_switch) {
+      if (!gst_rtp_theora_depay_switch_codebook (rtptheoradepay, ident))
+        goto switch_failed;
+    }
+  }
+
+  /* skip header */
+  payload += 4;
+  payload_len -= 4;
+
+  GST_DEBUG_OBJECT (depayload, "ident: %u, F: %d, TDT: %d, packets: %d", ident,
+      F, TDT, packets);
+
+  /* fragmented packets, assemble */
+  if (F != 0) {
+    GstBuffer *vdata;
+    guint headerskip;
+
+    if (F == 1) {
+      /* if we start a packet, clear adapter and start assembling. */
+      gst_adapter_clear (rtptheoradepay->adapter);
+      GST_DEBUG_OBJECT (depayload, "start assemble");
+      rtptheoradepay->assembling = TRUE;
+    }
+
+    if (!rtptheoradepay->assembling)
+      goto no_output;
+
+    /* first assembled packet, reuse 2 bytes to store the length */
+    headerskip = (F == 1 ? 4 : 6);
+    /* skip header and length. */
+    vdata = gst_rtp_buffer_get_payload_subbuffer (buf, headerskip, -1);
+
+    GST_DEBUG_OBJECT (depayload, "assemble theora packet");
+    gst_adapter_push (rtptheoradepay->adapter, vdata);
+
+    /* packet is not complete, we are done */
+    if (F != 3)
+      goto no_output;
+
+    /* construct assembled buffer */
+    payload_len = gst_adapter_available (rtptheoradepay->adapter);
+    payload = gst_adapter_take (rtptheoradepay->adapter, payload_len);
+    /* fix the length */
+    payload[0] = ((payload_len - 2) >> 8) & 0xff;
+    payload[1] = (payload_len - 2) & 0xff;
+    to_free = payload;
+  }
+
+  GST_DEBUG_OBJECT (depayload, "assemble done");
+
+  /* we not assembling anymore now */
+  rtptheoradepay->assembling = FALSE;
+  gst_adapter_clear (rtptheoradepay->adapter);
+
+  /* payload now points to a length with that many theora data bytes.
+   * Iterate over the packets and send them out.
+   *
+   *  0                   1                   2                   3
+   *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |             length            |          theora data         ..
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * ..                        theora data                           |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |            length             |   next theora packet data    ..
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * ..                        theora data                           |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*
+   */
+  timestamp = gst_rtp_buffer_get_timestamp (buf);
+
+  while (payload_len > 2) {
+    guint16 length;
+
+    length = GST_READ_UINT16_BE (payload);
+    payload += 2;
+    payload_len -= 2;
+
+    GST_DEBUG_OBJECT (depayload, "read length %u, avail: %d", length,
+        payload_len);
+
+    /* skip packet if something odd happens */
+    if (G_UNLIKELY (length > payload_len))
+      goto length_short;
+
+    /* create buffer for packet */
+    if (G_UNLIKELY (to_free)) {
+      outbuf = gst_buffer_new ();
+      GST_BUFFER_DATA (outbuf) = payload;
+      GST_BUFFER_MALLOCDATA (outbuf) = to_free;
+      GST_BUFFER_SIZE (outbuf) = length;
+      to_free = NULL;
+    } else {
+      outbuf = gst_buffer_new_and_alloc (length);
+      memcpy (GST_BUFFER_DATA (outbuf), payload, length);
+    }
+
+    payload += length;
+    payload_len -= length;
+
+    if (timestamp != -1)
+      /* push with timestamp of the last packet, which is the same timestamp that
+       * should apply to the first assembled packet. */
+      ret = gst_base_rtp_depayload_push_ts (depayload, timestamp, outbuf);
+    else
+      ret = gst_base_rtp_depayload_push (depayload, outbuf);
+
+    if (ret != GST_FLOW_OK)
+      break;
+
+    /* make sure we don't set a timestamp on next buffers */
+    timestamp = -1;
+  }
+
+  g_free (to_free);
+
+  return NULL;
+
+no_output:
+  {
+    return NULL;
+  }
+  /* ERORRS */
+bad_packet:
+  {
+    GST_ELEMENT_WARNING (rtptheoradepay, STREAM, DECODE,
+        (NULL), ("Packet did not validate"));
+    return NULL;
+  }
+switch_failed:
+  {
+    GST_ELEMENT_ERROR (rtptheoradepay, STREAM, DECODE,
+        (NULL), ("Could not switch codebooks"));
+    return NULL;
+  }
+packet_short:
+  {
+    GST_ELEMENT_WARNING (rtptheoradepay, STREAM, DECODE,
+        (NULL), ("Packet was too short (%d < 4)", payload_len));
+    return NULL;
+  }
+ignore_reserved:
+  {
+    GST_WARNING_OBJECT (rtptheoradepay, "reserved TDT ignored");
+    return NULL;
+  }
+length_short:
+  {
+    GST_ELEMENT_WARNING (rtptheoradepay, STREAM, DECODE,
+        (NULL), ("Packet contains invalid data"));
+    return NULL;
+  }
+}
+
+static void
+gst_rtp_theora_depay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstRtpTheoraDepay *rtptheoradepay;
+
+  rtptheoradepay = GST_RTP_THEORA_DEPAY (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_rtp_theora_depay_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstRtpTheoraDepay *rtptheoradepay;
+
+  rtptheoradepay = GST_RTP_THEORA_DEPAY (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstStateChangeReturn
+gst_rtp_theora_depay_change_state (GstElement * element,
+    GstStateChange transition)
+{
+  GstRtpTheoraDepay *rtptheoradepay;
+  GstStateChangeReturn ret;
+
+  rtptheoradepay = GST_RTP_THEORA_DEPAY (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      break;
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_READY_TO_NULL:
+      break;
+    default:
+      break;
+  }
+  return ret;
+}
+
+gboolean
+gst_rtp_theora_depay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtptheoradepay",
+      GST_RANK_MARGINAL, GST_TYPE_RTP_THEORA_DEPAY);
+}