#!/bin/bash
#
# Add a silent audio track to a video asset
#
# Usage:
#
#    jaddsilence in-file out-file [channel-mode] [sampling-rate]
#
# in-file       : input video file
# out-file      : write output file here
# channel-mode  : channel layout, usually 'mono' or 'stereo'. Default is stereo
# sampling-rate : sampling rate, in Hz. Default is 48000
#
SCRIPT="${0}"
SCRIPT_DIR="$(cd "$(dirname "${SCRIPT}")" && pwd)"
. "${SCRIPT_DIR}"/jvcl_common

IN_FILE="${1?no video-file provided}"
OUT_FILE="${2?no out-file provided}"
CHANNEL_LAYOUT="${3}"
SAMPLING_RATE="${4}"

echo "
{
  \"assets\": [
    { \"name\": \"input\", \"path\": \"${IN_FILE}\" }
  ],
  \"operations\": [
    {
      \"operation\": \"add-silence\",
      \"creates\": {
        \"name\": \"with_silence\",
        \"dest\": \"${OUT_FILE}\"
      },
      \"source\": \"input\"$(if [[ -n "${CHANNEL_LAYOUT}" ]] ; then echo ",
      \"channelLayout\": \"${CHANNEL_LAYOUT}\"" ; fi)$(if [[ -n "${SAMPLING_RATE}" ]] ; then echo ",
      \"samplingRate: \"${SAMPLING_RATE}\"" ; fi)
    }
  ]
}
" | "${SCRIPT_DIR}"/jvcl ${JVCL_OPTIONS}