mirror of
https://github.com/kmein/niveum
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90 lines
2.3 KiB
Nix
90 lines
2.3 KiB
Nix
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# Convert and transfer audio files to an MP3 player
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{
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writers,
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ffmpeg,
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coreutils,
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gnugrep,
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bash,
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}:
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writers.writeBashBin "mp3player-write" ''
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set -e
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SPEED=1.0
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while getopts ":s:" opt; do
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case $opt in
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s) SPEED=$OPTARG ;;
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\?) echo "Invalid option: -$OPTARG" >&2; exit 1 ;;
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:) echo "Option -$OPTARG requires a value." >&2; exit 1 ;;
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esac
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done
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shift $((OPTIND -1))
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if [ "$#" -lt 2 ]; then
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echo "Usage: mp3player-write [-s speed] MOUNT_POINT FILE1 [FILE2 ...]"
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exit 1
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fi
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MOUNT_POINT=$1
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shift
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FILES=("$@")
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if [ ! -d "$MOUNT_POINT" ]; then
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echo "Error: Mount point '$MOUNT_POINT' does not exist."
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exit 1
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fi
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TOTAL_SIZE=0
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for f in "''${FILES[@]}"; do
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if [ ! -f "$f" ]; then
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echo "Warning: File '$f' does not exist, skipping."
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continue
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fi
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FILE_SIZE=$(${coreutils}/bin/stat --printf="%s" "$f")
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TOTAL_SIZE=$((TOTAL_SIZE + FILE_SIZE / 2))
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done
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AVAILABLE=$(${coreutils}/bin/df --output=avail "$MOUNT_POINT" | ${coreutils}/bin/tail -n 1)
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AVAILABLE=$((AVAILABLE * 1024))
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if [ "$TOTAL_SIZE" -gt "$AVAILABLE" ]; then
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echo "Error: Not enough space. Required: $TOTAL_SIZE bytes, Available: $AVAILABLE bytes"
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exit 1
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fi
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echo "Enough space available. Starting conversion..."
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sanitize_filename() {
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local name
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name=$(${coreutils}/bin/basename "$1")
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name=''${name%.*}
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name=$(echo "$name" | ${coreutils}/bin/tr ' ' '_' | ${coreutils}/bin/tr -cd '[:alnum:]_-')
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echo "''${name:0:50}"
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}
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for f in "''${FILES[@]}"; do
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[ -f "$f" ] || continue
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existing_prefixes=$(${coreutils}/bin/ls "$MOUNT_POINT" | ${gnugrep}/bin/grep -E '^[0-9].*\.mp3$' | ${coreutils}/bin/sed -E 's/^([0-9]).*/\1/' | ${coreutils}/bin/sort -n | ${coreutils}/bin/uniq)
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for i in {0..9}; do
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if ! echo "$existing_prefixes" | ${gnugrep}/bin/grep -q "^$i$"; then
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PREFIX=$i
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break
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fi
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done
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BASENAME=$(sanitize_filename "$f")
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OUT_PATTERN="$MOUNT_POINT/''${PREFIX}_%03d_''${BASENAME}.mp3"
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echo "Converting '$f' to '$OUT_PATTERN' at speed $SPEED..."
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${ffmpeg}/bin/ffmpeg -nostdin -i "$f" \
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-filter:a "atempo=$SPEED" \
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-ar 22050 -ac 1 -c:a libmp3lame -b:a 32k \
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-f segment -segment_time 300 \
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"$OUT_PATTERN"
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done
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echo "All files processed successfully."
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''
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