/* GStreamer

 * Copyright (C) <2005> 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., 51 Franklin St, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#ifdef HAVE_CONFIG_H

#  include "config.h"

#endif

#include <gst/rtp/gstrtpbuffer.h>

#include <string.h>

#include "gstrtpmp2tdepay.h"

#include "gstrtputils.h"

/* RtpMP2TDepay signals and args */

enum

{

  /* FILL ME */

  LAST_SIGNAL

};

#define DEFAULT_SKIP_FIRST_BYTES	0

enum

{

  PROP_0,

  PROP_SKIP_FIRST_BYTES

};

static GstStaticPadTemplate gst_rtp_mp2t_depay_src_template =

GST_STATIC_PAD_TEMPLATE ("src",

    GST_PAD_SRC,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS ("video/mpegts,"

        "packetsize=(int)188," "systemstream=(boolean)true")

    );

static GstStaticPadTemplate gst_rtp_mp2t_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) { MP2T, MP2T-ES } ;"

        /* All optional parameters

         *

         * "profile-level-id=[1,MAX]"

         * "config=" 

         */

        "application/x-rtp, "

        "media = (string) \"video\", "

        "payload = (int) " GST_RTP_PAYLOAD_MP2T_STRING ", "

        "clock-rate = (int) [1, MAX ]")

    );

G_DEFINE_TYPE (GstRtpMP2TDepay, gst_rtp_mp2t_depay,

    GST_TYPE_RTP_BASE_DEPAYLOAD);

static gboolean gst_rtp_mp2t_depay_setcaps (GstRTPBaseDepayload * depayload,

    GstCaps * caps);

static GstBuffer *gst_rtp_mp2t_depay_process (GstRTPBaseDepayload * depayload,

    GstRTPBuffer * rtp);

static void gst_rtp_mp2t_depay_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec);

static void gst_rtp_mp2t_depay_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec);

static void

gst_rtp_mp2t_depay_class_init (GstRtpMP2TDepayClass * klass)

{

  GObjectClass *gobject_class;

  GstElementClass *gstelement_class;

  GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;

  gobject_class = (GObjectClass *) klass;

  gstelement_class = (GstElementClass *) klass;

  gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;

  gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mp2t_depay_process;

  gstrtpbasedepayload_class->set_caps = gst_rtp_mp2t_depay_setcaps;

  gobject_class->set_property = gst_rtp_mp2t_depay_set_property;

  gobject_class->get_property = gst_rtp_mp2t_depay_get_property;

  gst_element_class_add_static_pad_template (gstelement_class,

      &gst_rtp_mp2t_depay_src_template);

  gst_element_class_add_static_pad_template (gstelement_class,

      &gst_rtp_mp2t_depay_sink_template);

  gst_element_class_set_static_metadata (gstelement_class,

      "RTP MPEG Transport Stream depayloader", "Codec/Depayloader/Network/RTP",

      "Extracts MPEG2 TS from RTP packets (RFC 2250)",

      "Wim Taymans <wim.taymans@gmail.com>, "

      "Thijs Vermeir <thijs.vermeir@barco.com>");

  g_object_class_install_property (gobject_class, PROP_SKIP_FIRST_BYTES,

      g_param_spec_uint ("skip-first-bytes",

          "Skip first bytes",

          "The amount of bytes that need to be skipped at the beginning of the payload",

          0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

}

static void

gst_rtp_mp2t_depay_init (GstRtpMP2TDepay * rtpmp2tdepay)

{

  rtpmp2tdepay->skip_first_bytes = DEFAULT_SKIP_FIRST_BYTES;

}

static gboolean

gst_rtp_mp2t_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)

{

  GstCaps *srccaps;

  GstStructure *structure;

  gint clock_rate;

  gboolean res;

  structure = gst_caps_get_structure (caps, 0);

  if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))

    clock_rate = 90000;         /* default */

  depayload->clock_rate = clock_rate;

  srccaps = gst_caps_new_simple ("video/mpegts",

      "packetsize", G_TYPE_INT, 188,

      "systemstream", G_TYPE_BOOLEAN, TRUE, NULL);

  res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);

  gst_caps_unref (srccaps);

  return res;

}

static GstBuffer *

gst_rtp_mp2t_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)

{

  GstRtpMP2TDepay *rtpmp2tdepay;

  GstBuffer *outbuf;

  gint payload_len, leftover;

  rtpmp2tdepay = GST_RTP_MP2T_DEPAY (depayload);

  payload_len = gst_rtp_buffer_get_payload_len (rtp);

  if (G_UNLIKELY (payload_len <= rtpmp2tdepay->skip_first_bytes))

    goto empty_packet;

  payload_len -= rtpmp2tdepay->skip_first_bytes;

  /* RFC 2250

   *

   * 2. Encapsulation of MPEG System and Transport Streams

   *

   * For MPEG2 Transport Streams the RTP payload will contain an integral

   * number of MPEG transport packets.

   */

  leftover = payload_len % 188;

  if (G_UNLIKELY (leftover)) {

    GST_WARNING ("We don't have an integral number of buffers (leftover: %d)",

        leftover);

    payload_len -= leftover;

  }

  outbuf =

      gst_rtp_buffer_get_payload_subbuffer (rtp,

      rtpmp2tdepay->skip_first_bytes, payload_len);

  if (outbuf) {

    GST_DEBUG ("gst_rtp_mp2t_depay_chain: pushing buffer of size %"

        G_GSIZE_FORMAT, gst_buffer_get_size (outbuf));

    gst_rtp_drop_meta (GST_ELEMENT_CAST (depayload), outbuf, 0);

  }

  return outbuf;

  /* ERRORS */

empty_packet:

  {

    GST_ELEMENT_WARNING (rtpmp2tdepay, STREAM, DECODE,

        (NULL), ("Packet was empty"));

    return NULL;

  }

}

static void

gst_rtp_mp2t_depay_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec)

{

  GstRtpMP2TDepay *rtpmp2tdepay;

  rtpmp2tdepay = GST_RTP_MP2T_DEPAY (object);

  switch (prop_id) {

    case PROP_SKIP_FIRST_BYTES:

      rtpmp2tdepay->skip_first_bytes = g_value_get_uint (value);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static void

gst_rtp_mp2t_depay_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec)

{

  GstRtpMP2TDepay *rtpmp2tdepay;

  rtpmp2tdepay = GST_RTP_MP2T_DEPAY (object);

  switch (prop_id) {

    case PROP_SKIP_FIRST_BYTES:

      g_value_set_uint (value, rtpmp2tdepay->skip_first_bytes);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

gboolean

gst_rtp_mp2t_depay_plugin_init (GstPlugin * plugin)

{

  return gst_element_register (plugin, "rtpmp2tdepay",

      GST_RANK_SECONDARY, GST_TYPE_RTP_MP2T_DEPAY);

}