#!/bin/bash
# Copyright Ken Fallon - Released into the public domain. http://creativecommons.org/publicdomain/ 
intro_clip_end="00:01:30"
quality_clip_duration="90"
outro_clip="90"
#DEBUG="echo "
cd /mnt/DUMP/hpr-for-archive.org/todo/
for FILEX in *
do 
	if [[ "$(file "$FILEX" | grep -i audio | wc -l )" -ne 1 && "$(mediainfo "$FILEX" | grep -i audio | wc -l )" -ne 1 ]]
	then
		echo "$FILEX is not an audio file"
	else
		echo "Processing $FILEX"
		fname=${FILEX%.*}
		ext=${FILEX/*./}
		# We get the druation from mediainfo in miliseconds and remove the last three digits to convert it to seconds
		# Then calculate the times of the end clip working back from the end of the file
		# We then pick a random segment between the intro and outro. 
		# Finally we convert to hour minute second format and the date command is the easiest way to do that
		duration=$( mediainfo --full "${fname}.${ext}" | grep Duration | egrep -v ".*:.*:|ms|s|mn" | head -1 | awk -F ': ' '{print $2}' )
		duration="${duration:0:${#duration}-3}"
		outro_clip_start="$(($duration-$outro_clip))"
		quality_clip_end="$(($outro_clip_start-$quality_clip_duration))"
		quality_clip_start=$(shuf -i ${intro_clip_end}-${quality_clip_end} -n 1)
		quality_clip_end="$(($quality_clip_start+$quality_clip_duration))"
		duration=$(\date -d@${duration} -u +%H:%M:%S)
		quality_clip_start=$(\date -d@${quality_clip_start} -u +%H:%M:%S)
		quality_clip_end=$(\date -d@${quality_clip_end} -u +%H:%M:%S)
		outro_clip_start=$(\date -d@${outro_clip_start} -u +%H:%M:%S)
		echo -e "\tExtracting spectrogram"
		${DEBUG} sox "${fname}.${ext}" -n spectrogram -Y 130 -l -r -t "${fname}.${ext}" -o "${fname}_spectrogram.png"
		echo -e "\tExtracting intro clip from 0 to ${intro_clip_end}"
		${DEBUG} ffmpeg -y -ss 0 -t ${intro_clip_end} -i "${fname}.${ext}" "${fname}_intro_clip".wav 2>/dev/null
		echo -e "\tExtracting quality clip from ${quality_clip_start} to ${quality_clip_end}"
		${DEBUG} ffmpeg -y -ss ${quality_clip_start} -t ${quality_clip_end} -i "${fname}.${ext}" "${fname}_quality_clip".wav 2>/dev/null
		echo -e "\tExtracting outro clip from ${outro_clip_start}  ${duration}"
		${DEBUG} ffmpeg -y -ss ${outro_clip_start} -t ${duration} -i "${fname}.${ext}" "${fname}_outro_clip".wav 2>/dev/null
		echo -e "\tCreating low fidelity version"
		${DEBUG} ffmpeg -y -i "${fname}.${ext}" temp.wav  2>/dev/null
		${DEBUG} sox "temp.wav" -c 1 -r 16000 -t wav  - 2>/dev/null | speexenc - "${fname}_low_fidelity.spx" 2>/dev/null
		${DEBUG} rm temp.wav
	fi
done