#!/bin/bash

# This script will display six cameras in a 3x2 tiled display. The script
# assumes 1920x1080 display resolution.
#


##
# This generates a pipeline for a single camera
#
# @param sensor_id - 0-5
# @param overlay_id - 0-5
# @param x_offset - where to place the camera output
# @param y_offset - where to place the camera output
cam()
{
    local sensor_id="$1"
    local overlay_id="$2"
    local x_offset="$3"
    local y_offset="$4"

    # This won't display anything. This is useful for measuring system          
    # performance because there is no need to do any format                     
    # conversions.                                                              
    #echo -n nvcamerasrc  sensor-id=$sensor_id fpsRange=\"30 30\"
    #echo -n ! fpsdisplaysink text-overlay=false video-sink=fakesink

    # This displays the cameras on the screen                                   
    echo -n nvcamerasrc  sensor-id=$sensor_id fpsRange=\"30 30\"              
    echo -n ! 'video/x-raw(memory:NVMM), width=(int)640, height=(int)540, format=(string)NV12, framerate=(fraction)30/1'                                     
    # echo -n ! nvvidconv                                                       
    # echo -n ! fpsdisplaysink text-overlay=false video-sink='"'nvoverlaysink overlay=$overlay_id overlay-x=$x_offset overlay-y=$y_offset overlay-w=640 overlay-h=540'"'                                                                      

    # You don't have to use the fps sink                                        
    echo -n ! nvoverlaysink overlay=$overlay_id overlay-x=$x_offset overlay-y=$y_offset overlay-w=640 overlay-h=540       
}


# The -v is required to see the FPS values
# gst-launch-1.0 -v \
#     $(cam 5 5 0 0)  \
#     $(cam 4 4 640 0) \
#     $(cam 3 3 1280 0) \
#     $(cam 2 2 0 540) \
#     $(cam 1 1 640 540) \
#     $(cam 0 0 1280 540)

gst-launch-1.0 -v \
    $(cam 0 0 0 0)  \
    $(cam 1 1 640 0) \
    $(cam 2 2 1280 0)