#!/bin/sh

# Receive RTP video and audio streams

set -e
CAMIP=${CAMIP:-$1} # origin host - default: use multicast group
VCOUNT=${VCOUNT:-$2} # number of video stream(s) to display - default: 1
ACOUNT=${ACOUNT:-$3} # number of audio stream(s) to play - default: 0
VIDEO=${VIDEO:-$4} # H264 VP8 RAW - default: H264
AUDIO=${AUDIO:-$5} # AMR - default: AMR
set -u

# set multicast groups (also for recorder host) if camera host is wildcard
[ -n "$CAMIP" ] || RECMIP=239.255.0.1
[ -n "$CAMIP" ] || CAMMIP=239.255.0.2
RECHOST="${RECMIP:+address=$RECMIP auto-multicast=true}"
CAMHOST="${CAMIP:+host=$CAMIP}${CAMMIP:+host=$CAMMIP auto-multicast=true}"

case "$VIDEO" in
 H264|'')
  VCAPS="application/x-rtp,media=video,clock-rate=90000,payload=96,encoding-name=H264"
  VDEC="rtph264depay ! avdec_h264"
  ;;
 VP8)
  VCAPS="application/x-rtp,media=video,clock-rate=90000,payload=96,encoding-name=VP8"
  VDEC="rtpvp8depay ! vp8dec"
  ;;
 RAW)
  VCAPS="application/x-rtp,media=video,clock-rate=90000,encoding-name=RAW,sampling=YCbCr-4:2:0,depth=(string)8,width=(string)432,height=(string)240,colorimetry=BT601-5,payload=96,ssrc=(uint)2753200816,timestamp-offset=(uint)2145434971,seqnum-offset=(uint)15312,a-framerate=(string)30"
  VDEC="rtpvrawdepay ! videoconvert ! queue"
  ;;
esac

case "$AUDIO" in
 AMR|'')
  ACAPS="application/x-rtp,media=audio,clock-rate=8000,encoding-name=AMR,encoding-params=1,octet-align=1"
  ADEC="rtpamrdepay ! amrnbdec"
  ;;
esac

stream() {
 ID=$1
 CAPS=$2
 PLAYBIN=$3
 echo \
 udpsrc port=$((5000+ID-1)) $RECHOST caps=\""$CAPS"\" \
  ! "rtpbin.recv_rtp_sink_$ID" rtpbin. \
  ! $PLAYBIN \
 udpsrc port=$((5010+ID-1)) "$RECHOST" \
  ! "rtpbin.recv_rtcp_sink_$ID" \
 "rtpbin.send_rtcp_src_$ID" \
  ! udpsink port=$((5020+ID-1)) "$CAMHOST" sync=false async=false
}

gst-launch-1.0 -v \
 rtpbin name=rtpbin \
 $(for i in $(seq "${VCOUNT:-1}"); do stream "$i" "$VCAPS" "$VDEC ! autovideosink"; done) \
 $(for j in $(seq "${ACOUNT:-0}"); do stream $((VCOUNT+j)) "$ACAPS" "$ADEC ! autoaudiosink"; done)