core-blimey-splice

#!/bin/sh -eux
echo What YouTube song would you like? [Paste the URL]
read youtube_url

youtube-dl -o "tmp/temp.%(ext)s" --extract-audio --audio-format mp3 "${youtube_url}$"

sox tmp/temp.mp3 tmp/temp-resample.mp3 rate 48000
sox --norm=-0.1 tmp/temp-resample.mp3 tmp/temp-normal.mp3

DURATION=$(sox tmp/temp-normal.mp3 -n stat 2>&1 | sed -n 's#^Length (seconds):[^0-9]*\([0-9.]*\)$#\1#p')

sox --norm=-0.1 src/jingle.wav tmp/jingle.wav

echo How long are the reps [30, 45 or 60 seconds?]
read rep_duration

NUMBER_OF_REPS_WE_HAVE=$(echo "$DURATION / $rep_duration" | bc)

echo "🔁 We've got ${NUMBER_OF_REPS_WE_HAVE} repeats in the song!"

if (( NUMBER_OF_REPS_WE_HAVE > 4 )); then
  for i in 1 2 3 4 5
  do
    LAST_REP="$(($i-1))"
    REP_TIME_START="$(($LAST_REP*$rep_duration))"

    FILE_TO_SPLICE[i]="tmp/rep-${rep_duration}-${i}.mp3"
    sox tmp/temp-normal.mp3 "${FILENAME[i]}" trim "${REP_TIME_START}" "${rep_duration}"
  done
else

  for ((i=1;i<=$NUMBER_OF_REPS_WE_HAVE;i++))
  do
    LAST_REP="$(($i-1))"
    REP_TIME_START="$(($LAST_REP*$rep_duration))"

    FILENAME[i]="tmp/rep-${rep_duration}-${i}.mp3"
    FILE_TO_SPLICE[i]="${FILENAME[$i]}"
    sox tmp/temp-normal.mp3 "${FILENAME[i]}" trim "${REP_TIME_START}" "${rep_duration}"
  done

  REMAINING_REPS=$(echo "6 - $NUMBER_OF_REPS_WE_HAVE" | bc)

  for ((j=1;j<$REMAINING_REPS;j++))
  do
    SPLICE_COUNTER=$(echo "$NUMBER_OF_REPS_WE_HAVE + $j" | bc)

    TMP_COUNTER=$(echo "${SPLICE_COUNTER} % ${NUMBER_OF_REPS_WE_HAVE}" | bc)

    FILE_TO_SPLICE[$SPLICE_COUNTER]="${FILENAME[$TMP_COUNTER]}"
  done
fi

sox "${FILE_TO_SPLICE[1]}" tmp/jingle.wav "${FILE_TO_SPLICE[2]}" tmp/jingle.wav "${FILE_TO_SPLICE[3]}" tmp/jingle.wav "${FILE_TO_SPLICE[4]}" tmp/jingle.wav "${FILE_TO_SPLICE[5]}" tmp/jingle.wav "${rep_duration}-complete.mp3"

rm tmp/*