added script to convert wav files for use in firmware.

README.md

@@ -65,3 +65,11 @@ bestool write-image out/open_source/open_source.bin --port /dev/ttyACM1
 - Hold : Previous track
 - Triple tap : Volume Up
 - Quad tap : Volume Down
+
+## Changing audio alerts
+The audio alerts are stored in: 
+
+`config/_default_cfg_src_/res/en/`
+
+You can convert these .txt files to .wav files by using the script `convert.sh` with the -T flag, the resulting file will be named `output.wav`.
+If you want to change the alert to a custom sound use the -W flag on your wav file and then move the resulting `SOUND.txt` file to the place you want to replace (eg. `config/_default_cfg_src_/res/en/SOUND_POWER_ON.txt`)

convert.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+txt_to_wav() {
+  xxd -r -p $args > out.raw
+  ffmpeg -f sbc -ac 1 -i ./out.raw output.wav
+  rm ./out.raw
+}
+
+wav_to_txt() {
+  ffmpeg -i $args -f sbc -ac 16000 -ac 1 -map_metadata -1 out.raw
+  xxd -i ./out.raw | head -n -2 \
+    | tail -n +2 | sed 's/ //g' \
+    | tr --delete '\n' \
+    | sed 's/,/\,\n/16; P; D' > SOUND.txt
+  rm ./out.raw
+}
+
+[ ${1} = "-T" ] || [ ${1} = "--txt-to-wav" ] && shift 1 && args=$@ && txt_to_wav && exit
+[ ${1} = "-W" ] || [ ${1} = "--wav-to-txt" ] && shift 1 && args=$@ &&  wav_to_txt && exit
+echo "
+Sound format converter:
+Usage:
+  ./convert.sh [option] [input-file]
+Options:
+-T or --txt-to-wav   Converts the text file to a wav audio file (output.wav)
+-W or --wav-to-txt Converts a wav file to a file readable by the pinebuds firmware (SOUND.txt)
+"