gst/rtp/: Added experimental SVQ3 depayloader.

Original commit message from CVS:
* gst/rtp/Makefile.am:
* gst/rtp/gstrtp.c: (plugin_init):
* gst/rtp/gstrtpsv3vdepay.c: (gst_rtp_sv3v_depay_base_init),
(gst_rtp_sv3v_depay_class_init), (gst_rtp_sv3v_depay_init),
(gst_rtp_sv3v_depay_finalize), (gst_rtp_sv3v_depay_setcaps),
(gst_rtp_sv3v_depay_process), (gst_rtp_sv3v_depay_set_property),
(gst_rtp_sv3v_depay_get_property),
(gst_rtp_sv3v_depay_change_state),
(gst_rtp_sv3v_depay_plugin_init):
* gst/rtp/gstrtpsv3vdepay.h:
Added experimental SVQ3 depayloader.

1 files changed, 348 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpsv3vdepay.c b/gst/rtp/gstrtpsv3vdepay.c
new file mode 100644
index 00000000..162a7edd
--- /dev/null
+++ b/gst/rtp/gstrtpsv3vdepay.c
@@ -0,0 +1,348 @@
+/* GStreamer
+ * Copyright (C) <2005> 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 <string.h>
+
+#include <gst/rtp/gstrtpbuffer.h>
+#include "gstrtpsv3vdepay.h"
+
+/* elementfactory information */
+static const GstElementDetails gst_rtp_sv3vdepay_details =
+GST_ELEMENT_DETAILS ("RTP packet parser",
+    "Codec/Depayr/Network",
+    "Extracts SVQ3 video from RTP packets (no RFC)",
+    "Wim Taymans <wim@fluendo.com>");
+
+/* RtpSV3VDepay signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+  ARG_FREQUENCY
+};
+
+static GstStaticPadTemplate gst_rtp_sv3v_depay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-svq, " "svqversion = (int) 3")
+    );
+
+static GstStaticPadTemplate gst_rtp_sv3v_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) 90000, " "encoding-name = (string) \"X-SV3V-ES\"")
+    );
+
+GST_BOILERPLATE (GstRtpSV3VDepay, gst_rtp_sv3v_depay, GstBaseRTPDepayload,
+    GST_TYPE_BASE_RTP_DEPAYLOAD);
+
+static void gst_rtp_sv3v_depay_finalize (GObject * object);
+static void gst_rtp_sv3v_depay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_rtp_sv3v_depay_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static GstStateChangeReturn gst_rtp_sv3v_depay_change_state (GstElement *
+    element, GstStateChange transition);
+
+static GstBuffer *gst_rtp_sv3v_depay_process (GstBaseRTPDepayload * depayload,
+    GstBuffer * buf);
+gboolean gst_rtp_sv3v_depay_setcaps (GstBaseRTPDepayload * filter,
+    GstCaps * caps);
+
+static void
+gst_rtp_sv3v_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_sv3v_depay_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_sv3v_depay_sink_template));
+
+
+  gst_element_class_set_details (element_class, &gst_rtp_sv3vdepay_details);
+}
+
+static void
+gst_rtp_sv3v_depay_class_init (GstRtpSV3VDepayClass * 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_sv3v_depay_process;
+  gstbasertpdepayload_class->set_caps = gst_rtp_sv3v_depay_setcaps;
+
+  gobject_class->finalize = gst_rtp_sv3v_depay_finalize;
+
+  gobject_class->set_property = gst_rtp_sv3v_depay_set_property;
+  gobject_class->get_property = gst_rtp_sv3v_depay_get_property;
+
+  gstelement_class->change_state = gst_rtp_sv3v_depay_change_state;
+}
+
+static void
+gst_rtp_sv3v_depay_init (GstRtpSV3VDepay * rtpsv3vdepay,
+    GstRtpSV3VDepayClass * klass)
+{
+  rtpsv3vdepay->adapter = gst_adapter_new ();
+}
+
+static void
+gst_rtp_sv3v_depay_finalize (GObject * object)
+{
+  GstRtpSV3VDepay *rtpsv3vdepay;
+
+  rtpsv3vdepay = GST_RTP_SV3V_DEPAY (object);
+
+  g_object_unref (rtpsv3vdepay->adapter);
+  rtpsv3vdepay->adapter = NULL;
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+// only on the sink
+gboolean
+gst_rtp_sv3v_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps)
+{
+
+  GstStructure *structure = gst_caps_get_structure (caps, 0);
+  gint clock_rate = 90000;      // default
+
+  if (gst_structure_has_field (structure, "clock-rate"))
+    gst_structure_get_int (structure, "clock-rate", &clock_rate);
+
+  filter->clock_rate = clock_rate;
+
+  return TRUE;
+}
+
+
+static GstBuffer *
+gst_rtp_sv3v_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
+{
+
+  GstRtpSV3VDepay *rtpsv3vdepay;
+  GstBuffer *outbuf;
+  guint16 seq;
+
+  rtpsv3vdepay = GST_RTP_SV3V_DEPAY (depayload);
+
+  if (!gst_rtp_buffer_validate (buf))
+    goto bad_packet;
+
+  /* flush on sequence number gaps */
+  seq = gst_rtp_buffer_get_seq (buf);
+  if (seq != rtpsv3vdepay->nextseq) {
+    gst_adapter_clear (rtpsv3vdepay->adapter);
+  }
+  rtpsv3vdepay->nextseq = seq + 1;
+
+  {
+    gint payload_len;
+    guint8 *payload;
+    gboolean M;
+    gboolean C, S, E;
+
+    payload_len = gst_rtp_buffer_get_payload_len (buf);
+    if (payload_len < 3)
+      goto bad_packet;
+
+    payload = gst_rtp_buffer_get_payload (buf);
+
+    M = gst_rtp_buffer_get_marker (buf);
+
+    /* This is all a guess:
+     *                      1 1 1 1 1 1
+     *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 
+     * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     * |0|C|S|E|0|0|0|0|0|0|0|0|0|0|0|0|
+     * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+     *
+     * C: config, packet contains config info
+     * S: start, packet contains start of frame
+     * E: end, packet contains end of frame
+     */
+    /* this seems to indicate a packet with a config string sent before each
+     * keyframe */
+    C = (payload[0] & 0x40) == 0x40;
+
+    /* redundant with the RTP marker bit */
+    S = (payload[0] & 0x20) == 0x20;
+    E = (payload[0] & 0x10) == 0x10;
+
+    if (C) {
+      GstCaps *caps;
+      GstBuffer *codec_data;
+      GValue value = { 0 };
+
+      /* if we already have caps, we don't need to do anything. FIXME, check if
+       * something changed. */
+      if (GST_PAD_CAPS (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload)))
+        return NULL;
+
+      /* No idea... These are the two examples I found.. */
+      if (payload[2] == 0x1d) {
+        rtpsv3vdepay->width = 160;
+        rtpsv3vdepay->height = 128;
+      } else if (payload[2] == 0xdd) {
+        rtpsv3vdepay->width = 320;
+        rtpsv3vdepay->height = 240;
+      }
+
+      /* we need a dummy empty codec data */
+      g_value_init (&value, GST_TYPE_BUFFER);
+      gst_value_deserialize (&value, "");
+      codec_data = gst_value_get_buffer (&value);
+
+      caps = gst_caps_new_simple ("video/x-svq",
+          "svqversion", G_TYPE_INT, 3,
+          "width", G_TYPE_INT, rtpsv3vdepay->width,
+          "height", G_TYPE_INT, rtpsv3vdepay->height,
+          "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
+      gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), caps);
+      gst_caps_unref (caps);
+      g_value_unset (&value);
+
+      return NULL;
+    }
+
+    /* store data in adapter, stip off 2 bytes header */
+    outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 2, -1);
+    gst_adapter_push (rtpsv3vdepay->adapter, outbuf);
+
+    if (M) {
+      /* frame is completed: push contents of adapter */
+      guint avail;
+      guint8 *data;
+      guint32 timestamp;
+
+      avail = gst_adapter_available (rtpsv3vdepay->adapter);
+      data = gst_adapter_take (rtpsv3vdepay->adapter, avail);
+
+      /* create buffer with data */
+      outbuf = gst_rtp_buffer_new_take_data (data, avail);
+
+      /* timestamp for complete buffer is that of last buffer as well */
+      timestamp = gst_rtp_buffer_get_timestamp (buf);
+      GST_BUFFER_TIMESTAMP (outbuf) =
+          gst_util_uint64_scale_int (timestamp, GST_SECOND,
+          depayload->clock_rate);
+      gst_buffer_set_caps (outbuf, GST_PAD_CAPS (depayload->srcpad));
+
+      return outbuf;
+    }
+  }
+  return NULL;
+
+  /* ERRORS */
+bad_packet:
+  {
+    GST_ELEMENT_WARNING (rtpsv3vdepay, STREAM, DECODE,
+        ("Packet did not validate"), (NULL));
+    return NULL;
+  }
+}
+
+static void
+gst_rtp_sv3v_depay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstRtpSV3VDepay *rtpsv3vdepay;
+
+  rtpsv3vdepay = GST_RTP_SV3V_DEPAY (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_rtp_sv3v_depay_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstRtpSV3VDepay *rtpsv3vdepay;
+
+  rtpsv3vdepay = GST_RTP_SV3V_DEPAY (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstStateChangeReturn
+gst_rtp_sv3v_depay_change_state (GstElement * element,
+    GstStateChange transition)
+{
+  GstRtpSV3VDepay *rtpsv3vdepay;
+  GstStateChangeReturn ret;
+
+  rtpsv3vdepay = GST_RTP_SV3V_DEPAY (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      break;
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      gst_adapter_clear (rtpsv3vdepay->adapter);
+      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_sv3v_depay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpsv3vdepay",
+      GST_RANK_NONE, GST_TYPE_RTP_SV3V_DEPAY);
+}