user/convert_file_to_flac.sh

   1 #!/bin/bash
   2 # Desc: Converts file readable by ffmpeg to FLAC audio format
   3 # Usage: convert_file_to_flac.sh [path]
   4 # Version: 0.0.1
   5 # Ref/Attrib: [1] Convert audio file to FLAC with ffmpeg? https://superuser.com/a/802126
   6
   7 declare -Ag appRollCall # Associative array for storing app status
   8 declare -Ag fileRollCall # Associative array for storing file status
   9 declare -Ag dirRollCall # Associative array for storing dir status
  10
  11 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
  12 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
  13 try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
  14 checkapp() {
  15     # Desc: If arg is a command, save result in assoc array 'appRollCall'
  16     # Usage: checkapp arg1 arg2 arg3 ...
  17     # Version: 0.1.1
  18     # Input: global assoc. array 'appRollCall'
  19     # Output: adds/updates key(value) to global assoc array 'appRollCall'
  20     # Depends: bash 5.0.3
  21     local returnState
  22
  23     #===Process Args===
  24     for arg in "$@"; do
  25         if command -v "$arg" 1>/dev/null 2>&1; then # Check if arg is a valid command
  26             appRollCall[$arg]="true";
  27             if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
  28         else
  29             appRollCall[$arg]="false"; returnState="false";
  30         fi;
  31     done;
  32
  33     #===Determine function return code===
  34     if [ "$returnState" = "true" ]; then
  35         return 0;
  36     else
  37         return 1;
  38     fi;
  39 } # Check that app exists
  40 checkfile() {
  41     # Desc: If arg is a file path, save result in assoc array 'fileRollCall'
  42     # Usage: checkfile arg1 arg2 arg3 ...
  43     # Version: 0.1.1
  44     # Input: global assoc. array 'fileRollCall'
  45     # Output: adds/updates key(value) to global assoc array 'fileRollCall';
  46     # Output: returns 0 if app found, 1 otherwise
  47     # Depends: bash 5.0.3
  48     local returnState
  49
  50     #===Process Args===
  51     for arg in "$@"; do
  52         if [ -f "$arg" ]; then
  53             fileRollCall["$arg"]="true";
  54             if ! [ "$returnState" = "false" ]; then returnState="true"; fi;
  55         else
  56             fileRollCall["$arg"]="false"; returnState="false";
  57         fi;
  58     done;
  59
  60     #===Determine function return code===
  61     if [ "$returnState" = "true" ]; then
  62         return 0;
  63     else
  64         return 1;
  65     fi;
  66 } # Check that file exists
  67 checkdir() {
  68     # Desc: If arg is a dir path, save result in assoc array 'dirRollCall'
  69     # Usage: checkdir arg1 arg2 arg3 ...
  70     # Version 0.1.2
  71     # Input: global assoc. array 'dirRollCall'
  72     # Output: adds/updates key(value) to global assoc array 'dirRollCall';
  73     # Output: returns 0 if all args are dirs; 1 otherwise
  74     # Depends: Bash 5.0.3
  75     local returnState
  76
  77     #===Process Args===
  78     for arg in "$@"; do
  79         if [ -z "$arg" ]; then
  80             dirRollCall["(Unspecified Dirname(s))"]="false"; returnState="false";
  81         elif [ -d "$arg" ]; then
  82             dirRollCall["$arg"]="true";
  83             if ! [ "$returnState" = "false" ]; then returnState="true"; fi
  84         else
  85             dirRollCall["$arg"]="false"; returnState="false";
  86         fi
  87     done
  88
  89     #===Determine function return code===
  90     if [ "$returnState" = "true" ]; then
  91         return 0;
  92     else
  93         return 1;
  94     fi
  95 } # Check that dir exists
  96 displayMissing() {
  97     # Desc: Displays missing apps, files, and dirs
  98     # Usage: displayMissing
  99     # Version 1.0.0
 100     # Input: associative arrays: appRollCall, fileRollCall, dirRollCall
 101     # Output: stderr: messages indicating missing apps, file, or dirs
 102     # Output: returns exit code 0 if nothing missing; 1 otherwise
 103     # Depends: bash 5, checkAppFileDir()
 104     local missingApps value appMissing missingFiles fileMissing
 105     local missingDirs dirMissing
 106
 107     #==BEGIN Display errors==
 108     #===BEGIN Display Missing Apps===
 109     missingApps="Missing apps  :";
 110     #for key in "${!appRollCall[@]}"; do echo "DEBUG:$key => ${appRollCall[$key]}"; done
 111     for key in "${!appRollCall[@]}"; do
 112         value="${appRollCall[$key]}";
 113         if [ "$value" = "false" ]; then
 114             #echo "DEBUG:Missing apps: $key => $value";
 115             missingApps="$missingApps""$key ";
 116             appMissing="true";
 117         fi;
 118     done;
 119     if [ "$appMissing" = "true" ]; then  # Only indicate if an app is missing.
 120         echo "$missingApps" 1>&2;
 121     fi;
 122     unset value;
 123     #===END Display Missing Apps===
 124
 125     #===BEGIN Display Missing Files===
 126     missingFiles="Missing files:";
 127     #for key in "${!fileRollCall[@]}"; do echo "DEBUG:$key => ${fileRollCall[$key]}"; done
 128     for key in "${!fileRollCall[@]}"; do
 129         value="${fileRollCall[$key]}";
 130         if [ "$value" = "false" ]; then
 131             #echo "DEBUG:Missing files: $key => $value";
 132             missingFiles="$missingFiles""$key ";
 133             fileMissing="true";
 134         fi;
 135     done;
 136     if [ "$fileMissing" = "true" ]; then  # Only indicate if an app is missing.
 137         echo "$missingFiles" 1>&2;
 138     fi;
 139     unset value;
 140     #===END Display Missing Files===
 141
 142     #===BEGIN Display Missing Directories===
 143     missingDirs="Missing dirs:";
 144     #for key in "${!dirRollCall[@]}"; do echo "DEBUG:$key => ${dirRollCall[$key]}"; done
 145     for key in "${!dirRollCall[@]}"; do
 146         value="${dirRollCall[$key]}";
 147         if [ "$value" = "false" ]; then
 148             #echo "DEBUG:Missing dirs: $key => $value";
 149             missingDirs="$missingDirs""$key ";
 150             dirMissing="true";
 151         fi;
 152     done;
 153     if [ "$dirMissing" = "true" ]; then  # Only indicate if an dir is missing.
 154         echo "$missingDirs" 1>&2;
 155     fi;
 156     unset value;
 157     #===END Display Missing Directories===
 158
 159     #==END Display errors==
 160     #==BEGIN Determine function return code===
 161     if [ "$appMissing" == "true" ] || [ "$fileMissing" == "true" ] || [ "$dirMissing" == "true" ]; then
 162         return 1;
 163     else
 164         return 0;
 165     fi
 166     #==END Determine function return code===
 167 } # Display missing apps, files, dirs
 168 check_parsable_audio_ffprobe() {
 169     # Desc: Checks if ffprobe returns valid audio codec name for file
 170     # Usage: check_parsable_audio_ffprobe [path FILE]
 171     # Version: 0.0.1
 172     # Input: arg1: file path
 173     # Output: exit code 0 if returns valid codec name; 1 otherwise
 174     # Depends: ffprobe, die()
 175     local file_in ffprobe_out
 176
 177     if [[ $# -ne 1 ]]; then die "ERROR:Invalid number of args:$#"; fi;
 178
 179     file_in="$1";
 180
 181     # Check if ffprobe detects an audio stream
 182     if ffprobe -v error -select_streams a -show_entries stream=codec_name -of default=nokey=1:noprint_wrappers=1 "$file_in" 1>/dev/null 2>&1; then
 183         return_state="true";
 184     else
 185         return_state="false";
 186     fi;
 187
 188     # Fail if ffprobe returns no result
 189     ffprobe_out="$(ffprobe -v error -select_streams a -show_entries stream=codec_name -of default=nokey=1:noprint_wrappers=1 "$file_in")";
 190     if [[ -z $ffprobe_out ]]; then
 191         return_state="false";
 192     fi;
 193
 194     # Report exit code
 195     if [[ $return_state = "true" ]]; then
 196         return 0;
 197     else
 198         return 1;
 199     fi;
 200 } # Checks if file has valid codec name using ffprobe
 201 main() {
 202     # Check inputs
 203     if [[ ! -f $1 ]]; then die "FATAL:Not a file:$1"; fi;
 204     if [[ $# -ne 1 ]]; then die "FATAL:Arguments not equal to 1:$#"; fi;
 205
 206     # Check depends
 207     if ! checkapp ffmpeg ffprobe; then
 208         displayMissing;
 209         die "FATAL:Missing apps"; fi;
 210
 211
 212     # Check file is parsable by ffprobe
 213     if ! check_parsable_audio_ffprobe "$1"; then
 214         die "FATAL:Not an audio file:$1"; fi;
 215
 216     # Convert file to FLAC
 217     try ffmpeg -i "$1" -f "$1".flac
 218 }; # main program
 219
 220 main "$@";
 221
 222 # Author: Steven Baltakatei Sandoval
 223 # License: GPLv3+