mirror of https://bitbucket.org/ausocean/av.git
76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
/*
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NAME
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decode-pcm.go
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DESCRIPTION
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See Readme.md
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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LICENSE
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decode-pcm.go is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with revid in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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package main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"bitbucket.org/ausocean/av/stream/adpcm"
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)
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// This program accepts an input file encoded in adpcm and outputs a decoded pcm file.
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// Input and output file names can be specified as arguments.
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func main() {
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var inPath string
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var outPath string
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flag.StringVar(&inPath, "in", "encoded.adpcm", "file path of input")
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flag.StringVar(&outPath, "out", "decoded.pcm", "file path of output data")
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flag.Parse()
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// read adpcm
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comp, err := ioutil.ReadFile(inPath)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println("Read", len(comp), "bytes from file", inPath)
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// decode adpcm
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inBSize := 256
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numBlocks := int(len(comp) / inBSize)
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outBSize := 2 + (inBSize-4)*4 // 2 bytes are copied, 2 are used as block header info, the remaining bytes are decompressed 1:4
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decoded := make([]byte, 0, outBSize*numBlocks)
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for i := 0; i < numBlocks; i++ {
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block := comp[inBSize*i : inBSize*(i+1)]
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decBlock, err := adpcm.DecodeBlock(block)
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if err != nil {
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log.Fatal(err)
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}
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decoded = append(decoded, decBlock...)
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}
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// save pcm to file
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err = ioutil.WriteFile(outPath, decoded, 0644)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println("Decoded and wrote", len(decoded), "bytes to file", outPath)
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}
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