/*
 *  sydra
 *
 *  sydra is a toolbox which allows you to set up multiple bidirectional
 *  Video/Audio streams from external locations.
 *  sydra has been written to be used for the Elevate Festival in Graz
 *  Austria in order to involve external locations to present themselves
 *  at the festival.
 *
 *
 *  Copyright (C) 2014 Christian Pointner <equinox@spreadspace.org>
 *
 *  This file is part of sydra.
 *
 *  sydra is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  sydra 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with sydra. If not, see <http://www.gnu.org/licenses/>.
 *
 *  In addition, as a special exception, the copyright holders hereby
 *  grant permission for non-GPL-compatible GStreamer plugins to be used
 *  and distributed together with GStreamer and sydra.
 *  This permission goes above and beyond the permissions granted by the
 *  GPL license sydra is covered by.
 */

#include "datatypes.h"

#include <gst/gst.h>
#include <stdio.h>
#include <string.h>

#include "options.h"
#include "utils.h"
#include "log.h"

struct av_elements {
  const char* name_;

  GstElement* srcsink_;
  GstElement* tee_raw_;

  const char* encdec_str_;
  GstElement* encdec_;

  GstElement* tee_enc_;

  const char* payloader_str_;
  GstElement* payloader_;
};

static GstElement* create_avsend_src(const char* desc, GstElement* pipeline)
{
  GstElement* src = sydra_create_bin_from_desc("AV source bin", desc, FALSE);
  if(!src) return NULL;
  gst_bin_add(GST_BIN(pipeline), src);

  GstElement* element = gst_bin_get_by_name(GST_BIN(src), "videosrc");
  GstPad* pad = gst_element_get_static_pad(element, "src");
  if(!gst_element_add_pad(src, gst_ghost_pad_new("video", pad))) {
    log_printf(ERROR, "can't create video ghost pad for source bin");
    return NULL;
  }
  gst_object_unref(GST_OBJECT(pad));
  gst_object_unref(GST_OBJECT(element));

  element = gst_bin_get_by_name(GST_BIN(src), "audiosrc");
  pad = gst_element_get_static_pad(element, "src");
  if(!gst_element_add_pad(src, gst_ghost_pad_new("audio", pad))) {
    log_printf(ERROR, "can't create audio ghost pad for source bin");
    return NULL;
  }
  gst_object_unref(GST_OBJECT(pad));
  gst_object_unref(GST_OBJECT(element));

  return src;
}

static gboolean create_avsend_elements(struct av_elements *ave, GstElement* pipeline, GstElement *rtp, uint32_t session)
{
  ave->tee_raw_ = sydra_create_element("tee", NULL);
  GstElement *qr = sydra_create_element("queue", NULL);

  char bin_name[32];
  snprintf(bin_name, sizeof(bin_name), "%s encoder bin", ave->name_);
  ave->encdec_ = sydra_create_bin_from_desc(bin_name, ave->encdec_str_, TRUE);
  ave->tee_enc_ = sydra_create_element("tee", NULL);
  GstElement *qe = sydra_create_element("queue", NULL);
  ave->payloader_ = sydra_create_element(ave->payloader_str_, NULL);

  if(!ave->tee_raw_ || !qr || !ave->encdec_ || !ave->tee_enc_ || !qe || !ave->payloader_) {
    return FALSE;
  }

  log_printf(INFO, "%s path created successfully!", ave->name_);

  gst_bin_add_many(GST_BIN(pipeline), ave->tee_raw_, qr, ave->encdec_, ave->tee_enc_, qe, ave->payloader_, NULL);
  if(!sydra_link_static_static(ave->srcsink_, ave->name_, ave->tee_raw_, "sink")) return FALSE;
  gst_element_link_many(qr, ave->encdec_, ave->tee_enc_, NULL);
  gst_element_link(qe, ave->payloader_);

  char pad_name[32];
  snprintf(pad_name, sizeof(pad_name), "send_rtp_sink_%u", session);
  if(!sydra_link_request_static(ave->tee_raw_, "src_%u", qr, "sink") ||
     !sydra_link_request_static(ave->tee_enc_, "src_%u", qe, "sink") ||
     !sydra_link_static_request(ave->payloader_, "src", rtp, pad_name)) {
    return FALSE;
  }

  log_printf(INFO, "%s path linked successfully!", ave->name_);
  return TRUE;
}

static GstElement* create_avrecv_sink(const char* desc, GstElement* pipeline)
{
  GstElement* sink = sydra_create_bin_from_desc("AV sink bin", desc, FALSE);
  if(!sink) return NULL;
  gst_bin_add(GST_BIN(pipeline), sink);

  GstElement* element = gst_bin_get_by_name(GST_BIN(sink), "videosink");
  GstPad* pad = gst_element_get_static_pad(element, "sink");
  if(!gst_element_add_pad(sink, gst_ghost_pad_new("video", pad))) {
    log_printf(ERROR, "can't create video ghost pad for source bin");
    return NULL;
  }
  gst_object_unref(GST_OBJECT(pad));
  gst_object_unref(GST_OBJECT(element));

  element = gst_bin_get_by_name(GST_BIN(sink), "audiosink");
  pad = gst_element_get_static_pad(element, "sink");
  if(!gst_element_add_pad(sink, gst_ghost_pad_new("audio", pad))) {
    log_printf(ERROR, "can't create audio ghost pad for source bin");
    return NULL;
  }
  gst_object_unref(GST_OBJECT(pad));
  gst_object_unref(GST_OBJECT(element));

  return sink;
}

static gboolean create_avrecv_elements(struct av_elements *ave, GstElement* pipeline)
{
  ave->tee_raw_ = sydra_create_element("tee", NULL);
  GstElement *qr = sydra_create_element("queue", NULL);

  char bin_name[32];
  snprintf(bin_name, sizeof(bin_name), "%s decoder bin", ave->name_);
  ave->encdec_ = sydra_create_bin_from_desc(bin_name, ave->encdec_str_, TRUE);
  ave->tee_enc_ = sydra_create_element("tee", NULL);
  GstElement *qe = sydra_create_element("queue", NULL);
  ave->payloader_ = sydra_create_element(ave->payloader_str_, NULL);

  if(!ave->tee_raw_ || !qr || !ave->encdec_ || !ave->tee_enc_ || !qe || !ave->payloader_) {
    return FALSE;
  }

  log_printf(INFO, "%s path created successfully!", ave->name_);

  gst_bin_add_many (GST_BIN(pipeline), ave->tee_raw_, qr, ave->encdec_, ave->tee_enc_, qe, ave->payloader_, NULL);
  gst_element_link_many(ave->payloader_, ave->tee_enc_, qe, ave->encdec_, ave->tee_raw_, qr, NULL);
  if(!sydra_link_static_static(qr, "src", ave->srcsink_, ave->name_)) return FALSE;

  log_printf(INFO, "%s path linked successfully!", ave->name_);
  return TRUE;
}

static gboolean create_udp_sinks(options_t* opt, GstElement* pipeline, GstElement* rtp, struct udp_sinks *sinks)
{
  sinks->rtp_video_.udp_ = sydra_create_element("multiudpsink", "udprtpv");
  sinks->rtcp_video_.udp_ = sydra_create_element("multiudpsink", "udprtcpv");
  sinks->rtp_audio_.udp_ = sydra_create_element("multiudpsink", "udprtpa");
  sinks->rtcp_audio_.udp_ = sydra_create_element("multiudpsink", "udprtcpa");

  if(!(sinks->rtp_video_.udp_) || !(sinks->rtcp_video_.udp_) || !(sinks->rtp_audio_.udp_) || !(sinks->rtcp_audio_.udp_))
    return FALSE;

  log_printf(INFO, "udp sinks created successfully!");

  int rtp_port_local = opt->rtp_port_base_local_;
  g_object_set(G_OBJECT(sinks->rtp_video_.udp_), "bind-port", rtp_port_local++, NULL);
  g_object_set(G_OBJECT(sinks->rtcp_video_.udp_), "bind-port", rtp_port_local++, "sync", FALSE, "async", FALSE, NULL);
  g_object_set(G_OBJECT(sinks->rtp_audio_.udp_), "bind-port", rtp_port_local++, NULL);
  g_object_set(G_OBJECT(sinks->rtcp_audio_.udp_), "bind-port", rtp_port_local++, "sync", FALSE, "async", FALSE, NULL);

  if(opt->rtp_host_) {
    int rtp_port = opt->rtp_port_base_;
    g_signal_emit_by_name(G_OBJECT(sinks->rtp_video_.udp_), "add", opt->rtp_host_, rtp_port++, NULL);
    g_signal_emit_by_name(G_OBJECT(sinks->rtcp_video_.udp_), "add", opt->rtp_host_, rtp_port++, NULL);
    g_signal_emit_by_name(G_OBJECT(sinks->rtp_audio_.udp_), "add", opt->rtp_host_, rtp_port++, NULL);
    g_signal_emit_by_name(G_OBJECT(sinks->rtcp_audio_.udp_), "add", opt->rtp_host_, rtp_port++, NULL);
  }
  if(opt->rtp_addr_local_) {
    g_object_set(G_OBJECT(sinks->rtp_video_.udp_), "bind-address", opt->rtp_addr_local_, NULL);
    g_object_set(G_OBJECT(sinks->rtcp_video_.udp_), "bind-address", opt->rtp_addr_local_, NULL);
    g_object_set(G_OBJECT(sinks->rtp_audio_.udp_), "bind-address", opt->rtp_addr_local_, NULL);
    g_object_set(G_OBJECT(sinks->rtcp_audio_.udp_), "bind-address", opt->rtp_addr_local_, NULL);
  }

  log_printf(INFO, "udp sinks configured successfully!");

  gst_bin_add_many(GST_BIN(pipeline), sinks->rtp_video_.udp_, sinks->rtcp_video_.udp_, sinks->rtp_audio_.udp_, sinks->rtcp_audio_.udp_, NULL);

  if(!sydra_link_static_static(rtp, "send_rtp_src_0", sinks->rtp_video_.udp_, "sink") ||
     !sydra_link_request_static(rtp, "send_rtcp_src_0", sinks->rtcp_video_.udp_, "sink") ||
     !sydra_link_static_static(rtp, "send_rtp_src_1", sinks->rtp_audio_.udp_, "sink") ||
     !sydra_link_request_static(rtp, "send_rtcp_src_1", sinks->rtcp_audio_.udp_, "sink"))
    return FALSE;

  log_printf(INFO, "udp sinks linked successfully!");

  return TRUE;
}

struct udpsrc_tees {
  GstElement* rtpv_;
  GstElement* rtcpv_;
  GstElement* rtpa_;
  GstElement* rtcpa_;
};

static gboolean create_rtp_reflector(options_t* opt, GstElement* pipeline, struct udpsrc_tees *tees)
{
  GstElement* rtp_video = sydra_create_element("udpsink", "udprtpvref");
  GstElement* qrtpv = sydra_create_element("queue", NULL);
  GstElement* rtcp_video = sydra_create_element("udpsink", "udprtcpvref");
  GstElement* qrtcpv = sydra_create_element("queue", NULL);
  GstElement* rtp_audio = sydra_create_element("udpsink", "udprtparef");
  GstElement* qrtpa = sydra_create_element("queue", NULL);
  GstElement* rtcp_audio = sydra_create_element("udpsink", "udprtcparef");
  GstElement* qrtcpa = sydra_create_element("queue", NULL);

  if(!rtp_video || !rtcp_video || !rtp_audio || !rtcp_audio || !qrtpv || !qrtcpv || !qrtpa || !qrtcpa)
    return FALSE;

  log_printf(INFO, "udp reflector sinks created successfully!");

  int rtp_port_reflector = opt->rtp_port_base_reflector_;
  g_object_set(G_OBJECT(rtp_video), "host", opt->rtp_host_reflector_, "port", rtp_port_reflector++, "sync", FALSE, NULL);
  g_object_set(G_OBJECT(rtcp_video), "host", opt->rtp_host_reflector_, "port", rtp_port_reflector++, "sync", FALSE, NULL);
  g_object_set(G_OBJECT(rtp_audio), "host", opt->rtp_host_reflector_, "port", rtp_port_reflector++, "sync", FALSE, NULL);
  g_object_set(G_OBJECT(rtcp_audio), "host", opt->rtp_host_reflector_, "port", rtp_port_reflector++, "sync", FALSE, NULL);

  log_printf(INFO, "udp reflector sinks configured successfully!");

  gst_bin_add_many(GST_BIN(pipeline), rtp_video, rtcp_video, rtp_audio, rtcp_audio, NULL);
  gst_bin_add_many(GST_BIN(pipeline), qrtpv, qrtcpv, qrtpa, qrtcpa, NULL);

  gst_element_link(qrtpv, rtp_video);
  gst_element_link(qrtcpv, rtcp_video);
  gst_element_link(qrtpa, rtp_audio);
  gst_element_link(qrtcpa, rtcp_audio);

  if(!sydra_link_request_static(tees->rtpv_, "src_%u", qrtpv, "sink") ||
     !sydra_link_request_static(tees->rtcpv_, "src_%u", qrtcpv, "sink") ||
     !sydra_link_request_static(tees->rtpa_, "src_%u", qrtpa, "sink") ||
     !sydra_link_request_static(tees->rtcpa_, "src_%u", qrtcpa, "sink"))
    return FALSE;

  log_printf(INFO, "udp reflector sinks linked successfully!");

  return TRUE;
}

static gboolean create_udp_sources(options_t* opt, GstElement* pipeline, GstElement* rtp, struct udp_sources *sources)
{
  struct udpsrc_tees tees;

  sources->rtp_video_ = sydra_create_element("udpsrc", "udprtpv");
  tees.rtpv_ = sydra_create_element("tee", "rtpvt");
  GstElement* qrtpv = sydra_create_element("queue", NULL);
  sources->rtcp_video_ = sydra_create_element("udpsrc", "udprtcpv");
  tees.rtcpv_ = sydra_create_element("tee", "rtcpvt");
  GstElement* qrtcpv = sydra_create_element("queue", NULL);
  sources->rtp_audio_ = sydra_create_element("udpsrc", "udprtpa");
  tees.rtpa_ = sydra_create_element("tee", "rtpat");
  GstElement* qrtpa = sydra_create_element("queue", NULL);
  sources->rtcp_audio_ = sydra_create_element("udpsrc", "udprtcpa");
  tees.rtcpa_ = sydra_create_element("tee", "rtcpat");
  GstElement* qrtcpa = sydra_create_element("queue", NULL);

  if(!(sources->rtp_video_) || !(sources->rtcp_video_) || !(sources->rtp_audio_) || !(sources->rtcp_audio_) ||
     !(tees.rtpv_) || !(tees.rtcpv_) || !(tees.rtpa_) || !(tees.rtcpa_) || !qrtpv || !qrtcpv || !qrtpa || !qrtcpa)
    return FALSE;

  log_printf(INFO, "udp sources created successfully!");

  GstCaps *video_caps = gst_caps_from_string(opt->video_caps_);
  GstCaps *audio_caps = gst_caps_from_string(opt->audio_caps_);
  if(!video_caps || !audio_caps) {
    log_printf(ERROR, "parsing video or audio caps failed!");
    return FALSE;
  }
  int rtp_port_local = opt->rtp_port_base_local_;
  g_object_set(G_OBJECT(sources->rtp_video_), "port", rtp_port_local++, "caps", video_caps, NULL);
  g_object_set(G_OBJECT(sources->rtcp_video_), "port", rtp_port_local++, NULL);
  g_object_set(G_OBJECT(sources->rtp_audio_), "port", rtp_port_local++, "caps", audio_caps, NULL);
  g_object_set(G_OBJECT(sources->rtcp_audio_), "port", rtp_port_local++, NULL);
  gst_caps_unref(video_caps);
  gst_caps_unref(audio_caps);

  if(opt->rtp_addr_local_) {
    g_object_set(G_OBJECT(sources->rtp_video_), "address", opt->rtp_addr_local_, NULL);
    g_object_set(G_OBJECT(sources->rtcp_video_), "address", opt->rtp_addr_local_, NULL);
    g_object_set(G_OBJECT(sources->rtp_audio_), "address", opt->rtp_addr_local_, NULL);
    g_object_set(G_OBJECT(sources->rtcp_audio_), "address", opt->rtp_addr_local_, NULL);
  }

  log_printf(INFO, "udp sources configured successfully!");

  gst_bin_add_many(GST_BIN(pipeline), sources->rtp_video_, sources->rtcp_video_, sources->rtp_audio_, sources->rtcp_audio_, NULL);
  gst_bin_add_many(GST_BIN(pipeline), tees.rtpv_, tees.rtcpv_, tees.rtpa_, tees.rtcpa_, NULL);
  gst_bin_add_many(GST_BIN(pipeline), qrtpv, qrtcpv, qrtpa, qrtcpa, NULL);

  gst_element_link(sources->rtp_video_, tees.rtpv_);
  gst_element_link(sources->rtcp_video_, tees.rtcpv_);
  gst_element_link(sources->rtp_audio_, tees.rtpa_);
  gst_element_link(sources->rtcp_audio_, tees.rtcpa_);

  if(!sydra_link_request_static(tees.rtpv_, "src_%u", qrtpv, "sink") ||
     !sydra_link_static_request(qrtpv, "src", rtp, "recv_rtp_sink_0") ||
     !sydra_link_request_static(tees.rtcpv_, "src_%u", qrtcpv, "sink") ||
     !sydra_link_static_request(qrtcpv, "src", rtp, "recv_rtcp_sink_0") ||
     !sydra_link_request_static(tees.rtpa_, "src_%u", qrtpa, "sink") ||
     !sydra_link_static_request(qrtpa, "src", rtp, "recv_rtp_sink_1") ||
     !sydra_link_request_static(tees.rtcpa_, "src_%u", qrtcpa, "sink") ||
     !sydra_link_static_request(qrtcpa, "src", rtp, "recv_rtcp_sink_1"))
    return FALSE;

  log_printf(INFO, "udp sources linked successfully!");

  if(opt->rtp_host_reflector_)
    return create_rtp_reflector(opt, pipeline, &tees);

  return TRUE;
}

static gboolean create_preview_elements(const char* preview_bin_desc, GstElement* pipeline, GstElement* tee)
{
  GstElement *qr = sydra_create_element("queue", NULL);
  GstElement *preview_bin = sydra_create_bin_from_desc("preview sink bin", preview_bin_desc, TRUE);

  if(!qr || !preview_bin) {
    return FALSE;
  }

  log_printf(INFO, "preview path created successfully!");

  gst_bin_add_many (GST_BIN(pipeline), qr, preview_bin, NULL);
  gst_element_link(qr, preview_bin);

  if(!sydra_link_request_static(tee, "src_%u", qr, "sink")) {
    return FALSE;
  }

  log_printf(INFO, "preview path linked successfully!");
  return TRUE;
}

static gboolean create_recorder_elements(options_t* opt, GstElement* pipeline, struct av_elements *ve, struct av_elements *ae)
{
  GstElement *qv = sydra_create_element("queue", NULL);
  GstElement *qa = sydra_create_element("queue", NULL);
  GstElement *mux = sydra_create_element(opt->rec_mux_, NULL);
  GstElement *sink = sydra_create_element("filesink", NULL);

  if(!qv || !qa || !mux || !sink) {
    return FALSE;
  }

  GstElement *ev = NULL, *tv = ve->tee_enc_;
  if(opt->video_enc_rec_) {
    ev = sydra_create_bin_from_desc("record video encoder bin", opt->video_enc_rec_, TRUE);
    if(!ev) return FALSE;
    tv = ve->tee_raw_;
  }
  GstElement *ea = NULL, *ta = ae->tee_enc_;
  if(opt->audio_enc_rec_) {
    ea = sydra_create_bin_from_desc("record audio encoder bin", opt->audio_enc_rec_, TRUE);
    if(!ea) return FALSE;
    ta = ae->tee_raw_;
  }

  log_printf(INFO, "recorder path created successfully!");

  struct timespec now;
  clock_gettime(CLOCK_REALTIME, &now);
  struct tm bd_time;
  localtime_r(&(now.tv_sec), &bd_time);
  char recfile[1024];
  recfile[0] = 0;
  strftime(recfile, sizeof(recfile), opt->rec_name_format_, &bd_time);
  g_object_set(G_OBJECT(sink), "location", recfile, NULL);

  gst_bin_add_many(GST_BIN(pipeline), qv, qa, mux, sink, NULL);
  gst_element_link(mux, sink);
  GstElement* sv = qv;
  if(ev) {
    gst_bin_add(GST_BIN(pipeline), ev);
    gst_element_link(qv, ev);
    sv = ev;
  }
  GstElement* sa = qa;
  if(ev) {
    gst_bin_add(GST_BIN(pipeline), ea);
    gst_element_link(qa, ea);
    sa = ea;
  }

  if(!sydra_link_request_static(tv, "src_%u", qv, "sink") ||
     !sydra_link_static_compatible(sv, "src", mux) ||
     !sydra_link_request_static(ta, "src_%u", qa, "sink") ||
     !sydra_link_static_compatible(sa, "src", mux)) {
    return FALSE;
  }

  log_printf(INFO, "recorder path linked successfully!");
  return TRUE;
}

GstElement* create_sender_pipeline(options_t* opt, struct udp_sinks *udp)
{
  GstElement *pipeline = gst_pipeline_new ("sydra-rtp-sender");
  if(!pipeline) {
    log_printf(ERROR, "Creating pipeline failed!");
    return NULL;
  }
  GstElement *rtp = sydra_create_element("rtpbin", "rtpbin");
  if(!rtp || !gst_bin_add(GST_BIN(pipeline), rtp)) return NULL;
  log_printf(INFO, "rtpbin created successfully!");

  GstElement* src = create_avsend_src(opt->source_, pipeline);
  if(!src) return NULL;
  log_printf(INFO, "source bin created successfully!");

  struct av_elements video = { "video", src, NULL, opt->video_enc_, NULL, NULL,
                                  opt->video_payloader_, NULL };
  struct av_elements audio = { "audio", src, NULL, opt->audio_enc_, NULL, NULL,
                                  opt->audio_payloader_, NULL };
  if(!create_avsend_elements(&video, pipeline, rtp, 0) ||
     !create_avsend_elements(&audio, pipeline, rtp, 1) ||
     !create_udp_sinks(opt, pipeline, rtp, udp)) {
    return NULL;
  }

  if(opt->preview_videosink_) {
    if(!create_preview_elements(opt->preview_videosink_, pipeline, video.tee_raw_))
      return NULL;
  }

  if(opt->rec_mux_) {
    if(!create_recorder_elements(opt, pipeline, &video, &audio))
      return NULL;
  }

  log_printf(INFO, "sender pipeline created successfully!");
  return pipeline;
}

static void rtpbin_pad_added(GstElement* rtp, GstPad* pad, gpointer user_data)
{
  GstElement **depays = (GstElement**)user_data;

  GstPadTemplate  *pad_template = gst_pad_get_pad_template(pad);
  if(pad_template == NULL) return;
  if(strcmp("recv_rtp_src_%u_%u_%u", GST_PAD_TEMPLATE_NAME_TEMPLATE(pad_template))) {
    gst_object_unref(GST_OBJECT(pad_template));
    return;
  }
  gst_object_unref(GST_OBJECT(pad_template));

  gchar* src_pad_name = gst_element_get_name(pad);
  log_printf(INFO, "rtpbin: new pad created %s", src_pad_name);

  guint i;
  for(i = 0; i < 2; i++) {
    GstPad *sink_pad = gst_element_get_static_pad(depays[i], "sink");
    if(gst_pad_is_linked(sink_pad) || !gst_pad_can_link(pad, sink_pad)) {
      gst_object_unref(GST_OBJECT(sink_pad));
      continue;
    }
    GstPadLinkReturn ret = gst_pad_link(pad, sink_pad);
    gst_object_unref(GST_OBJECT(sink_pad));

    if(GST_PAD_LINK_FAILED(ret)) {
      gchar* src_name = gst_element_get_name(rtp);
      gchar* sink_name = gst_element_get_name(depays[i]);
      log_printf(ERROR, "Error linking pad '%s' of '%s' with pad '%s' of '%s'",
                 src_pad_name, src_name, "sink", sink_name);
      g_free(src_name);
      g_free(sink_name);
      continue;
    }
    break;
  }
  if(!gst_pad_is_linked(pad)) {
    log_printf(ERROR, "rtpbin: no compatible depayloader found for pad %s", src_pad_name);
  }
  g_free(src_pad_name);
}

GstElement* create_receiver_pipeline(options_t* opt, struct udp_sources *udp)
{
  GstElement *pipeline = gst_pipeline_new ("sydra-rtp-receiver");
  if(!pipeline) {
    log_printf(ERROR, "Creating pipeline failed!");
    return NULL;
  }
  GstElement *rtp = sydra_create_element("rtpbin", "rtpbin");
  if(!rtp || !gst_bin_add(GST_BIN(pipeline), rtp)) {
    return NULL;
  }
  log_printf(INFO, "rtpbin created successfully!");

  GstElement* sink = create_avrecv_sink(opt->sink_, pipeline);
  if(!sink) return NULL;
  log_printf(INFO, "sink bin created successfully!");

  struct av_elements video = { "video", sink, NULL, opt->video_dec_, NULL, NULL,
                                  opt->video_depayloader_, NULL };
  struct av_elements audio = { "audio", sink, NULL, opt->audio_dec_, NULL, NULL,
                                  opt->audio_depayloader_, NULL };
  if(!create_udp_sources(opt, pipeline, rtp, udp) ||
     !create_avrecv_elements(&video, pipeline) ||
     !create_avrecv_elements(&audio, pipeline)) {
    return NULL;
  }
  GstElement **depays = g_new(GstElement*, 2);
  depays[0] = video.payloader_;
  depays[1] = audio.payloader_;
  g_signal_connect_closure(rtp, "pad-added", g_cclosure_new(G_CALLBACK(rtpbin_pad_added), depays, NULL), FALSE);

  if(opt->rec_mux_) {
    if(!create_recorder_elements(opt, pipeline, &video, &audio))
      return NULL;
  }

  log_printf(INFO, "receiver pipeline created successfully!");
  return pipeline;
}