add scripts to pad files to 20ms blocks

#!/bin/bash

#   (C) 2022-2023 IVAS codec Public Collaboration with portions copyright Dolby International AB, Ericsson AB,

#   Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,

#   Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,

#   Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other

#   contributors to this repository. All Rights Reserved.

#   This software is protected by copyright law and by international treaties.

#   The IVAS codec Public Collaboration consisting of Dolby International AB, Ericsson AB,

#   Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,

#   Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,

#   Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other

#   contributors to this repository retain full ownership rights in their respective contributions in

#   the software. This notice grants no license of any kind, including but not limited to patent

#   license, nor is any license granted by implication, estoppel or otherwise.

#   Contributors are required to enter into the IVAS codec Public Collaboration agreement before making

#   contributions.

#   This software is provided "AS IS", without any express or implied warranties. The software is in the

#   development stage. It is intended exclusively for experts who have experience with such software and

#   solely for the purpose of inspection. All implied warranties of non-infringement, merchantability

#   and fitness for a particular purpose are hereby disclaimed and excluded.

#   Any dispute, controversy or claim arising under or in relation to providing this software shall be

#   submitted to and settled by the final, binding jurisdiction of the courts of Munich, Germany in

#   accordance with the laws of the Federal Republic of Germany excluding its conflict of law rules and

#   the United Nations Convention on Contracts on the International Sales of Goods.

if [ $# -lt 2 ]

then

  echo "Usage: $0 in.wav out.wav"

  echo "Aligns in.wav to 20ms blocks by appending zero samples; output is stored in out.wav"

  echo "Requires: InfoAudio, CopyAudio"

  exit 1

fi

file_in=$1

file_out=$2

InfoAudio=InfoAudio

CopyAudio=CopyAudio

# getting all info from InfoAudio - storing in res

res=`$InfoAudio $file_in`

# paring res

sampleFreq=`echo "$res" | grep -m1 "Sampling frequency" | sed -e 's/\([a-zA-Z\. ]*: \)\([0-9]*\)\(.*\)/\2/g'`

numberSamples=`echo "$res" | grep -m1 "No. frames" | sed -e 's/\([a-zA-Z\. ]*: \)\([0-9]*\)\(.*\)/\2/g'`

remainder=$(expr $numberSamples % 960)

samplesToPad=0

if [ $remainder -eq 0 ]; then

    # no padding required, just copy files

    cp $file_in $file_out

else

    samplesToPad=$(expr 960 - $remainder)

    limit=$(expr $samplesToPad - 1)

    # copy required number of sampled to pad into temp file, scale with 0 gain --> results in silence

    tmp=`mktemp`

    $CopyAudio -l 0:$limit -g 0 $file_in $tmp

    # concatenate original file with silence block

    $CopyAudio --concatenate $file_in $tmp $file_out

    # delete tmp file

    rm -f $tmp

fi