gst/rtp/: Add MPEG2 video payloader

Original commit message from CVS:
* gst/rtp/Makefile.am:
* gst/rtp/gstrtp.c:
* gst/rtp/gstrtpmpvpay.c:
* gst/rtp/gstrtpmpvpay.h:
Add MPEG2 video payloader

1 files changed, 238 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpmpvpay.c b/gst/rtp/gstrtpmpvpay.c
new file mode 100644
index 00000000..087ac729
--- /dev/null
+++ b/gst/rtp/gstrtpmpvpay.c
@@ -0,0 +1,238 @@
+/* GStreamer
+ * Copyright (C) <2007> Thijs Vermeir <thijsvermeir@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 <stdlib.h>
+#include <string.h>
+#include <gst/rtp/gstrtpbuffer.h>
+
+#include "gstrtpmpvpay.h"
+
+static const GstElementDetails gst_rtp_mpv_pay_details =
+GST_ELEMENT_DETAILS ("RTP MPEG2 ES video payloader",
+    "Codec/Payloader/Network",
+    "Payload-encodes MPEG2 ES into RTP packets (RFC 2250)",
+    "Thijs Vermeir <thijsvermeir@gmail.com>");
+
+static GstStaticPadTemplate gst_rtp_mpv_pay_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/mpeg, "
+        "mpegversion = (int) 2, systemstream = (boolean) FALSE")
+    );
+
+static GstStaticPadTemplate gst_rtp_mpv_pay_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/x-rtp, "
+        "media = (string) \"video\", "
+        "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
+        "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"")
+    );
+
+static gboolean gst_rtp_mpv_pay_setcaps (GstBaseRTPPayload * payload,
+    GstCaps * caps);
+static GstFlowReturn gst_rtp_mpv_pay_handle_buffer (GstBaseRTPPayload *
+    payload, GstBuffer * buffer);
+static GstFlowReturn gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay,
+    GstClockTime timestamp, GstClockTime duration);
+static void gst_rtp_mpv_pay_finalize (GObject * object);
+
+GST_BOILERPLATE (GstRTPMPVPay, gst_rtp_mpv_pay, GstBaseRTPPayload,
+    GST_TYPE_BASE_RTP_PAYLOAD);
+
+static void
+gst_rtp_mpv_pay_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_mpv_pay_sink_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_rtp_mpv_pay_src_template));
+  gst_element_class_set_details (element_class, &gst_rtp_mpv_pay_details);
+}
+
+static void
+gst_rtp_mpv_pay_class_init (GstRTPMPVPayClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+  GstBaseRTPPayloadClass *gstbasertppayload_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+  gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
+
+  gobject_class->finalize = gst_rtp_mpv_pay_finalize;
+
+  gstbasertppayload_class->set_caps = gst_rtp_mpv_pay_setcaps;
+  gstbasertppayload_class->handle_buffer = gst_rtp_mpv_pay_handle_buffer;
+}
+
+static void
+gst_rtp_mpv_pay_init (GstRTPMPVPay * rtpmpvpay, GstRTPMPVPayClass * klass)
+{
+  GST_BASE_RTP_PAYLOAD (rtpmpvpay)->clock_rate = 90000;
+  GST_BASE_RTP_PAYLOAD_PT (rtpmpvpay) = GST_RTP_PAYLOAD_MPV;
+
+  rtpmpvpay->adapter = gst_adapter_new ();
+}
+
+static void
+gst_rtp_mpv_pay_finalize (GObject * object)
+{
+  GstRTPMPVPay *rtpmpvpay;
+
+  rtpmpvpay = GST_RTP_MPV_PAY (object);
+
+  g_object_unref (rtpmpvpay->adapter);
+  rtpmpvpay->adapter = NULL;
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static gboolean
+gst_rtp_mpv_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
+{
+  const char *stname;
+  GstStructure *structure;
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  stname = gst_structure_get_name (structure);
+
+  gst_basertppayload_set_options (payload, "video", FALSE, "MPV", 90000);
+  gst_basertppayload_set_outcaps (payload, NULL);
+
+  return TRUE;
+}
+
+static GstFlowReturn
+gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay, GstClockTime timestamp,
+    GstClockTime duration)
+{
+  GstBuffer *outbuf;
+  GstFlowReturn ret;
+  guint avail;
+  guint8 *payload;
+  gint packet_size;
+  gint payload_size;
+
+  avail = gst_adapter_available (rtpmpvpay->adapter);
+  packet_size = gst_rtp_buffer_calc_packet_len (4 + avail, 0, 0);
+
+  /* check for the maximum size of the rtp buffer */
+  if (packet_size > GST_BASE_RTP_PAYLOAD_MTU (rtpmpvpay)) {
+    payload_size =
+        GST_BASE_RTP_PAYLOAD_MTU (rtpmpvpay) -
+        gst_rtp_buffer_calc_packet_len (4, 0, 0);
+  } else {
+    payload_size = avail;
+  }
+  outbuf = gst_rtp_buffer_new_allocate (4 + payload_size, 0, 0);
+  /* enable MPEG Video-specific header
+   *
+   *  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
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   * |    MBZ  |T|         TR        | |N|S|B|E|  P  | | BFC | | FFC |
+   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   *                                  AN              FBV     FFV
+   */
+  payload = gst_rtp_buffer_get_payload (outbuf);
+  /* fill in the MPEG Video-specific header */
+  memset (payload, 0x0, 4);
+  /* copy stuff from adapter to payload */
+  gst_adapter_copy (rtpmpvpay->adapter, payload + 4, 0, payload_size);
+  GST_BUFFER_TIMESTAMP (outbuf) = rtpmpvpay->first_ts;
+  GST_BUFFER_DURATION (outbuf) = rtpmpvpay->duration;
+
+  GST_DEBUG_OBJECT (rtpmpvpay, "pushing buffer of size %d",
+      GST_BUFFER_SIZE (outbuf));
+  ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtpmpvpay), outbuf);
+  gst_adapter_flush (rtpmpvpay->adapter, payload_size);
+
+  /* update the timestamp and duration */
+  rtpmpvpay->first_ts = timestamp;
+  rtpmpvpay->duration = duration;
+
+  /* check if there is enough data for another rtp buffer */
+  avail = gst_adapter_available (rtpmpvpay->adapter);
+  packet_size = gst_rtp_buffer_calc_packet_len (4 + avail, 0, 0);
+
+  if (packet_size >= GST_BASE_RTP_PAYLOAD_MTU (rtpmpvpay) && ret == GST_FLOW_OK) {
+    GST_DEBUG_OBJECT (rtpmpvpay, "Have enough data for another rtp packet");
+    ret = gst_rtp_mpv_pay_flush (rtpmpvpay, timestamp, duration);
+  }
+  return ret;
+}
+
+static GstFlowReturn
+gst_rtp_mpv_pay_handle_buffer (GstBaseRTPPayload * basepayload,
+    GstBuffer * buffer)
+{
+  GstRTPMPVPay *rtpmpvpay;
+  guint size, avail, packet_len;
+  guint8 *data;
+  GstClockTime timestamp, duration;
+  GstFlowReturn ret;
+
+  rtpmpvpay = GST_RTP_MPV_PAY (basepayload);
+
+  size = GST_BUFFER_SIZE (buffer);
+  data = GST_BUFFER_DATA (buffer);
+  timestamp = GST_BUFFER_TIMESTAMP (buffer);
+  duration = GST_BUFFER_DURATION (buffer);
+
+  gst_adapter_push (rtpmpvpay->adapter, buffer);
+  avail = gst_adapter_available (rtpmpvpay->adapter);
+
+  /* Initialize new RTP payload */
+  if (avail == 0) {
+    rtpmpvpay->first_ts = timestamp;
+    rtpmpvpay->duration = duration;
+  }
+
+  /* get packet length of previous data and this new data,
+   * payload length includes a 4 byte MPEG video-specific header */
+  packet_len = gst_rtp_buffer_calc_packet_len (4 + avail, 0, 0);
+
+  if (gst_basertppayload_is_filled (basepayload,
+          packet_len, rtpmpvpay->duration + duration)) {
+    ret = gst_rtp_mpv_pay_flush (rtpmpvpay, timestamp, duration);
+  } else {
+    if (GST_CLOCK_TIME_IS_VALID (duration))
+      rtpmpvpay->duration += duration;
+    ret = GST_FLOW_OK;
+  }
+  return ret;
+}
+
+gboolean
+gst_rtp_mpv_pay_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "rtpmpvpay",
+      GST_RANK_NONE, GST_TYPE_RTP_MPV_PAY);
+}