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/*
Copyright (C) 2016 - 2017, Lefteris Zafiris <zaf@fastmail.com>
This program is free software, distributed under the terms of
the BSD 3-Clause License. See the LICENSE file
at the top of the source tree.
g711dec decodes 8bit G711 PCM data to 16 Bit signed LPCM raw data
*/
package main
import (
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/zaf/g711"
)
func main() {
if len(os.Args) == 1 || os.Args[1] == "help" || os.Args[1] == "--help" {
fmt.Printf("%s Decodes 8bit G711 PCM data to raw 16 Bit signed LPCM\n", os.Args[0])
fmt.Println("The program takes as input a list A-law or u-law encoded files")
fmt.Println("decodes them to LPCM and saves the files with a \".raw\" extension.")
fmt.Printf("\nUsage: %s [files]\n", os.Args[0])
os.Exit(1)
}
var exitCode int
for _, file := range os.Args[1:] {
err := decodeG711(file)
if err != nil {
fmt.Println(err)
exitCode = 1
}
}
os.Exit(exitCode)
}
func decodeG711(file string) error {
input, err := os.Open(file)
if err != nil {
return err
}
defer input.Close()
extension := strings.ToLower(filepath.Ext(file))
decoder := new(g711.Decoder)
if extension == ".alaw" || extension == ".al" {
decoder, err = g711.NewAlawDecoder(input)
if err != nil {
return err
}
} else if extension == ".ulaw" || extension == ".ul" {
decoder, err = g711.NewUlawDecoder(input)
if err != nil {
return err
}
} else {
err = fmt.Errorf("Unrecognised format for file: %s", file)
return err
}
outName := strings.TrimSuffix(file, filepath.Ext(file)) + ".raw"
outFile, err := os.Create(outName)
if err != nil {
return err
}
defer outFile.Close()
_, err = io.Copy(outFile, decoder)
return err
}
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