#!/bin/bash

if [[ "$1" == *help ]]; then
  echo "Usage: ${0} [-duration 10] [-sound plughw:1,0]"
  echo "default duration (in seconds) is infinite"
  echo "default sound is anullsrc i.e. silent sound"
  exit 1
fi
# available options

# 640x480/60
# 1296x972/43
# 1920x1080/30
# 2592x1944/15

#VIDEO_RES_HEIGHT="1080"
#VIDEO_RES_WIDTH="1920"

#VIDEO_RES_HEIGHT="972"
#VIDEO_RES_WIDTH="1296"

VIDEO_BITRATE="700000"
VIDEO_RES_HEIGHT="480"
VIDEO_RES_WIDTH="640"
VIDEO_FRAMERATE="10"
VIDEO_FILE="camera_$(date +%Y-%m-%d_%H-%M-%S).mp4"
VIDEO_DURATION="1000000000"
SOUND_SOURCE="anullsrc"

while [[ $# -gt 0 ]]; do
  case $1 in
    -sound)
      if [ -n "$2" ]; then
        SOUND_SOURCE="$2"
        shift
      fi
      ;;
    -duration)
     if [ -n "$2" ]; then
        VIDEO_DURATION="$2"
        shift
     fi
      ;;
    *)
     echo "Unknown parameter $1"
     exit 1
  esac
  shift
done

# Set up a trap to check for SIGINT
trap "pkill rpicam-vid; exit 130" SIGINT

# Start the pipeline
rpicam-vid --inline \
		-n \
                -t 0 \
		--width ${VIDEO_RES_WIDTH} \
		--height ${VIDEO_RES_HEIGHT} \
		--nopreview \
		--exposure long \
		--sharpness 1.2 \
		--contrast 1.4 \
		--brightness 0.2 \
		--saturation 1.0 \
		--awb auto \
		--denoise auto \
		--rotation 0 \
		--autofocus-mode auto \
		--codec h264 \
		--framerate ${VIDEO_FRAMERATE} \
		-b ${VIDEO_BITRATE} \
		-o - | \

if [ "${SOUND_SOURCE}" = "anullsrc" ]; then
    # ffmpeg params with silent audio
    ffmpeg -hide_banner \
                -f lavfi \
                -i anullsrc=channel_layout=stereo:sample_rate=44100 \
                -thread_queue_size 1024 \
                -use_wallclock_as_timestamps 1 \
                -i pipe:0 \
                -c:v copy \
                -c:a aac \
                -preset fast \
                -strict experimental \
                -f mp4 \
                -t ${VIDEO_DURATION} \
                ${VIDEO_FILE} &
else
    # ffmpeg params with audio
    ffmpeg -hide_banner \
		-f alsa \
                -thread_queue_size 1024 \
                -ac 2 \
                -i ${SOUND_SOURCE} \
                -thread_queue_size 1024 \
                -use_wallclock_as_timestamps 1 \
                -i pipe:0 \
                -c:v copy \
                -c:a aac \
		-b:a 32k \
                -ar 44100 \
                -f mp4 \
                -t ${VIDEO_DURATION} \
                ${VIDEO_FILE} &
fi

# Get process ID
pid=$!

# Wait for process to finish or get terminated signal
wait || pkill rpicam-vid; exit 130