functions2.sh

#!/system/bin/sh

function toHexLE() {
    if [ $# -eq 1  -a  $1 -gt 0 ]; then
      printf "%2.2x%2.2x%2.2x%2.2x" $(( $1 % 256 ))  $(( $1 / 256 % 256 ))  $(( $1 / 256 / 256 % 256 ))  $(( $1 / 256 / 256 / 256 % 256 ))
      return 0
    else
      return 1
    fi
}

function toHexLineLE() {
    if [ $# -eq 1 ]; then
      for i in $1; do
        toHexLE $i
      done
      return 0
    else
      return 1
    fi
}

# Patch libalsautils.so to clear the 96kHz lock of USB audio class drivers
#   arg1: original libalsautils.so file;  arg2: patched libalsautils.so file; 
#     optional arg3: "max" (clearing full sample rates), "full" (clearing upto 386kHz) or another (clearing upto 192kHz)
function patchClearLock() {
    local orig_rates='96000  88200  192000  176400  48000  44100  32000  24000  22050  16000  12000  11025  8000'
    local new_rates='192000  176400  96000  88200  48000  44100  32000  24000  22050  16000  12000  11025  8000'
    
    if [ $# -ge 2  -a  -r "$1" ]; then
      if [ $# -gt 2 ]; then
          case "$3" in
             "max" )
               new_rates='768000  705600  384000  352800  192000  176400  96000  88200  48000  44100  24000  16000  8000'
               ;;
             "full" )
               new_rates='384000  352800  192000  176400  96000  88200  48000  44100  32000  24000  16000  12000  8000'
               ;;
             * )
               ;;
          esac
      fi

      local pat1=`toHexLineLE "$orig_rates"`
      local pat2=`toHexLineLE "$new_rates"`
      
      xxd -p <"$1" | tr -d ' \n' | sed -e "s/$pat1/$pat2/" \
          | awk 'BEGIN {
                 foldWidth=60
                 getline buf
                 len=length(buf)
                 for (i=1; i <= len; i+=foldWidth) {
                     if (i + foldWidth - 1 <= len)
                         print substr(buf, i, foldWidth)
                     else
                         print substr(buf, i, len)
                 }
                 exit
             }'  \
         | xxd -r -p >"$2"
      return $?
    else
      return 1
    fi
}