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flacjack.go
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flacjack.go
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/*
flacjack converts FLAC files to other formats, where "other formats"
currently means MP3.
Copyright (c) 2016 Geoff Hickey
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.
*/
package main
import (
"bufio"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strings"
"github.com/pborman/getopt"
)
// Progress represents how far along a file conversion is.
type Progress struct {
gortn int // The index of the goroutine
file string // Source file name (flac file)
dest string // Destination file name (mp3 file)
stage string // Name of the current stage
err error // Error information, if any error is encountered
}
func (p Progress) String() string {
if len(p.stage) == 0 {
return "Idle"
}
// The termcodes embedded here set the color of the stage to green.
return fmt.Sprintf("%-60v \033[32m%15v\033[0m", path.Base(p.file), p.stage)
}
// ErrorMsg returns an error message if this translation failed
func (p Progress) ErrorMsg() string {
if p.err == nil {
return ""
}
return fmt.Sprintf("%v ERROR: %v", p.file, p.err)
}
// Command line flags
var inputpath, outputpath *string
var transch = make(chan string, 100)
func main() {
inputpath = getopt.StringLong("input-path", 'i', "/mnt/music/flac",
"the location of the FLAC files to convert")
outputpath = getopt.StringLong("output-path", 'o', "/mnt/music/mp3",
"where to put the translated files")
help := getopt.BoolLong("help", 'h', "display this usage information")
getopt.SetParameters("")
getopt.Parse()
if *help {
getopt.Usage()
os.Exit(0)
}
// flag.Parse()
converters := runtime.GOMAXPROCS(0)
fmt.Printf("Starting FLAC converter with %v routines\n", converters)
// Channel for the converters to report progress to the main routine.
outputch := make(chan Progress)
// Channel for the converters to signal they're done.
donech := make(chan int)
// Array to hold the current progress for every routine.
rtnProgress := make([]Progress, converters)
// Make room for the goroutine status lines
fmt.Print(strings.Repeat("\n", converters))
// Start a goroutine to find the files we need to convert, and several more
// to process the files.
go findTranslatables(transch)
for i := 0; i < converters; i++ {
go convert(i, transch, outputch, donech)
}
for {
select {
case prog := <-outputch:
rtnProgress[prog.gortn] = prog
showProgress(rtnProgress)
case <-donech:
converters--
if converters == 0 {
return
}
}
}
}
func showProgress(p []Progress) {
fmt.Printf("\033[%vA\033[0G", len(p))
// Print all errors first, so they don't get erased
// TODO: emit termcodes only when stdout is a tty
// TODO: clean up termcodes
for _, prog := range p {
if prog.err != nil {
fmt.Printf("")
// These termcodes clear the line and turn the errors red.
fmt.Printf("\033[0K\033[31m%v\033[0K\033[0m\n", prog.ErrorMsg())
fmt.Printf("")
}
}
for ix, prog := range p {
// Termcode to clear the line.
fmt.Printf("\033[0K")
fmt.Printf("%2v: %v\n", ix, prog)
}
}
func findTranslatables(transch chan string) {
// Close the channel on exit, which will shut down the program.
defer close(transch)
filepath.Walk(*inputpath, walker)
}
// This is called for each file in our directory walk.
func walker(path string, info os.FileInfo, err error) error {
if err != nil {
log.Printf("failed to read from directory %s\n", *inputpath)
return err
}
if info.IsDir() {
return nil
}
ext := filepath.Ext(path)
if strings.ToLower(ext) != ".flac" {
return nil
}
// Found a flac file. Now, is it already converted?
ofile := mp3name(path)
_, err = os.Stat(ofile)
if os.IsNotExist(err) {
transch <- path
}
return nil
}
// Return the full path of the output file. To build this path, strip the
// inputpath from the beginning of the input path, and replace it with the
// outputpath, and replace the extension with 'mp3'.
func mp3name(fn string) string {
ext := filepath.Ext(fn)
ofile := fn[len(*inputpath):len(fn)-len(ext)] + ".mp3"
ofile = path.Join(*outputpath, ofile)
return ofile
}
// A number of convert goroutines will run until the program finishes.
func convert(ix int, transch chan string, outputch chan Progress, donech chan int) {
prog := new(Progress)
prog.gortn = ix
outputch <- *prog
for {
select {
case file, more := <-transch:
if more {
convertFile(ix, file, outputch)
outputch <- *prog
} else {
donech <- 1
return
}
}
}
}
// Convert a source file to the target format.
func convertFile(ix int, fn string, outputch chan Progress) {
prog := new(Progress)
// Get the tags
prog.gortn = ix
prog.stage = "Extracting tags"
prog.file = fn
prog.dest = mp3name(fn)
outputch <- *prog
tags, err := flacTags(fn)
if err != nil {
prog.err = err
outputch <- *prog
return
}
// Decode the FLAC file
prog.stage = "Decode FLAC"
outputch <- *prog
wavfile, err := decodeFlac(fn)
if err != nil {
prog.err = err
outputch <- *prog
return
}
defer os.Remove(wavfile)
// Encode the MP3
prog.stage = "Encode MP3"
outputch <- *prog
err = encodeMp3(wavfile, mp3name(fn), tags)
if err != nil {
prog.err = err
outputch <- *prog
return
}
}
// Get the tags from a flac file, in a dictionary.
func flacTags(flacfile string) (tags map[string]string, err error) {
tags = make(map[string]string)
// Allow genre to be missing
tags["genre"] = "None"
cmd := exec.Command("metaflac", "--export-tags-to=-", "--no-utf8-convert", flacfile)
stdout, err := cmd.StdoutPipe()
err = cmd.Start()
if err != nil {
return
}
// Read the tags. Convert double-quotes to singles, and lowercase the tag
// names because some rippers use caps. (MusicBrainz)
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
line := strings.Replace(scanner.Text(), `"`, `'`, -1)
tag := strings.Split(line, "=")
key := strings.ToLower(tag[0])
value := ""
// Allow blank values
if len(tag) > 1 {
value = tag[1]
}
tags[key] = value
}
err = cmd.Wait()
if err != nil {
return tags, err
}
return tags, nil
}
// Decode a flac file to a wav file, and return the name of the wav file.
func decodeFlac(fn string) (string, error) {
ofile, err := ioutil.TempFile("", "cnv")
if err != nil {
return "", err
}
ofile.Close()
defer func() {
if err != nil {
os.Remove(ofile.Name())
}
}()
cmd := exec.Command("flac", "-f", "-d", fn, "-o", ofile.Name())
err = cmd.Start()
if err != nil {
return "", err
}
err = cmd.Wait()
if err != nil {
return "", err
}
return ofile.Name(), nil
}
// Encode a wav file to mp3 by calling lame.
func encodeMp3(inf, outf string, tags map[string]string) error {
outdir := path.Dir(outf)
err := os.MkdirAll(outdir, 0755)
if err != nil {
return err
}
requiredTags := [...]string{"artist", "title", "genre", "album",
"tracknumber", "date"}
for _, tag := range requiredTags {
if len(tags[tag]) == 0 {
return fmt.Errorf("Required tag %v missing on %v", tag, inf)
}
}
cmd := exec.Command("lame", "-q", "2", "--vbr-new",
"-b", "192", "-B", "320", "--preset", "extreme",
"--ta", tags["artist"],
"--tt", tags["title"],
"--tg", tags["genre"],
"--tl", tags["album"],
"--tn", tags["tracknumber"],
"--ty", tags["date"],
inf, outf)
err = cmd.Start()
if err != nil {
return err
}
err = cmd.Wait()
if err != nil {
return err
}
return nil
}