feat: Make sox command as a variable, so sox_ng or docker images could be used

Author: Ardakilic

README.md

@@ -19,6 +19,11 @@ This is a Bash script for transcoding and downsampling 24-bit FLAC files to 16-b
   - Install on macOS: `brew install sox`
   - Install on Windows: Use WSL and install depending on the subsystem.
 
+You can also use alternative SoX implementations:
+- Docker image: `bigpapoo/sox`
+- SoX-NG: A drop-in replacement for SoX ([SoX-NG Project](https://codeberg.org/sox_ng/sox_ng/))
+- My Docker image for SoX-NG: `ardakilic/sox_ng`. Source code of the Image is [here](https://github.com/Ardakilic/sox_ng_dockerized).
+
 ## Usage
 
 Run the script with the source directory as an argument:
@@ -32,6 +37,10 @@ Run the script with the source directory as an argument:
 - `--target-dir <dir>` : Specify the target directory (default: `./transcoded`).
 - `--copy-images` : Copy JPG and PNG image files.
 
+### Environment Variables:
+
+- `SOX_COMMAND`: Override the default `sox` command (default: "sox")
+
 ### Example Usage
 
 Convert FLAC files from `Music/HiRes` and store the transcoded files in `Music/Converted`:
@@ -46,6 +55,20 @@ Convert FLAC files and copy images:
 ./flac-converter.sh Music/HiRes --copy-images
 ```
 
+Using with Docker:
+
+```bash
+SOX_COMMAND="docker run -v $(pwd):/work --rm bigpapoo/sox mysox" ./flac-converter.sh Music/HiRes
+# or my builds of sox_ng, which is better maintained and up-to-date
+SOX_COMMAND="docker run --rm -v $(pwd):/audio ardakilic/sox_ng" ./flac-converter.sh Music/HiRes
+```
+
+Using with SoX-NG directly:
+
+```bash
+SOX_COMMAND="sox_ng" ./flac-converter.sh Music/HiRes
+```
+
 ## How It Works
 
 1. The script scans the source directory for `.flac` and `.mp3` files.

flac-converter.sh

@@ -8,6 +8,9 @@
 # Copyright (C) 2025 Arda Kilicdagi
 # Licensed under MIT License
 
+# Define the sox command - can be overridden via environment variable
+: "${SOX_COMMAND:=sox}"
+
 # Function to display usage
 show_usage() {
     echo "Usage: $0 <source_directory> [options]"
@@ -53,8 +56,8 @@ while [[ $# -gt 0 ]]; do
 done
 
 # Check if sox is installed
-if ! command -v sox &> /dev/null; then
-    echo "Error: sox is not installed. Please install sox to continue."
+if ! command -v ${SOX_COMMAND%% *} &> /dev/null; then
+    echo "Error: sox (or Docker) is not installed. Please ensure it is installed to continue."
     exit 1
 fi
 
@@ -70,7 +73,7 @@ mkdir -p "$TRANSCODED_DIR"
 # Function to get audio file info using sox
 get_audio_info() {
     local file="$1"
-    local info=$(sox --i "$file")
+    local info=$($SOX_COMMAND --i "$file")
     local bits=$(echo "$info" | grep "Sample Encoding" | grep -o "[0-9]\+")
     local rate=$(echo "$info" | grep "Sample Rate" | grep -o "[0-9]\+")
     echo "$bits $rate"
@@ -127,9 +130,9 @@ find "$SOURCE_DIR" \( -name "*.flac" -o -name "*.mp3" \) | while read -r file; d
     if [ "$needs_conversion" = true ]; then
         echo "Converting FLAC: $file"
         # Debugging
-        # echo "sox --multi-threaded -G '$file' $bitrate_args '$target_file' $sample_rate_args dither"
+        # echo "$SOX_COMMAND --multi-threaded -G '$file' $bitrate_args '$target_file' $sample_rate_args dither"
         # shellcheck disable=SC2086
-        sox --multi-threaded -G "$file" $bitrate_args "$target_file" $sample_rate_args dither
+        $SOX_COMMAND --multi-threaded -G "$file" $bitrate_args "$target_file" $sample_rate_args dither
     else
         echo "Copying FLAC: $file"
         cp "$file" "$target_file"