/* NAME encode-pcm.go DESCRIPTION encode-pcm.go is a program for encoding/compressing a pcm file to an adpcm file. AUTHOR Trek Hopton <trek@ausocean.org> LICENSE encode-pcm.go is Copyright (C) 2018 the Australian Ocean Lab (AusOcean) It is free software: you can redistribute it and/or modify them under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. It is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses). */ package main import ( "bytes" "flag" "fmt" "io/ioutil" "log" "bitbucket.org/ausocean/av/codec/adpcm" ) // This program accepts an input pcm file and outputs an encoded adpcm file. // Input and output file names can be specified as arguments. func main() { var inPath string var adpcmPath string flag.StringVar(&inPath, "in", "data.pcm", "file path of input data") flag.StringVar(&adpcmPath, "out", "encoded.adpcm", "file path of output") flag.Parse() // Read pcm. pcm, err := ioutil.ReadFile(inPath) if err != nil { log.Fatal(err) } fmt.Println("Read", len(pcm), "bytes from file", inPath) // Encode adpcm. numBlocks := len(pcm) / adpcm.PcmBS comp := bytes.NewBuffer(make([]byte, 0, adpcm.AdpcmBS*numBlocks)) enc := adpcm.NewEncoder(comp) _, err = enc.Write(pcm) if err != nil { log.Fatal(err) } // Save adpcm to file. err = ioutil.WriteFile(adpcmPath, comp.Bytes(), 0644) if err != nil { log.Fatal(err) } fmt.Println("Encoded and wrote", len(comp.Bytes()), "bytes to file", adpcmPath) }