av/cmd/adpcm/decode-pcm/decode-pcm.go

package main

import (
	"flag"
	"io/ioutil"

	"bitbucket.org/ausocean/av/stream/adpcm"
)

// This program accepts an input file encoded in adpcm and outputs a decoded pcm file.
// Input and output file names can be specified as arguments.
func main() {
	var inPath string
	var outPath string

	flag.StringVar(&inPath, "in", "encoded.adpcm", "file path of input")
	flag.StringVar(&outPath, "out", "decoded.pcm", "file path of output data")
	flag.Parse()
	//read adpcm
	comp, err := ioutil.ReadFile(inPath)
	if err != nil {
		panic(err)
	}
	//decode adpcm
	var decoded []byte
	start := 0
	for i := 0; i < len(comp); i++ {
		if i%256 == 255 {
			block := comp[start : i+1]
			decBlock, err := adpcm.DecodeBlock(block)
			if err != nil {
				panic(err)
			}
			decoded = append(decoded, decBlock...)
			start = i + 1
		}
	}
	// save pcm to file
	err = ioutil.WriteFile(outPath, decoded, 0644)
	if err != nil {
		panic(err)
	}
}