ADPCM: added programs to test encoding and decoding of raw PCM files

cmd/adpcm/cmd/decode/decode.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+
+	"bitbucket.org/ausocean/av/cmd/adpcm"
+)
+
+func main() {
+	var inPath string
+	var outPath string
+	var nChannels int
+	var rate int
+	var bps int
+	flag.StringVar(&inPath, "in", "encoded.adpcm", "file path of input")
+	flag.StringVar(&outPath, "out", "decoded.pcm", "file path of output data")
+	flag.IntVar(&nChannels, "channels", 1, "number of channels in adpcm data")
+	flag.IntVar(&rate, "rate", 8000, "number of channels in adpcm data")
+	flag.IntVar(&bps, "bps", 16, "number of channels in adpcm data")
+	flag.Parse()
+	//read adpcm
+	comp, err := ioutil.ReadFile(inPath)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Read ADPCM from " + inPath + ". First 8 bytes: ")
+	for i := 0; i < len(comp) && i < 16; i++ {
+		fmt.Print(comp[i], ", ")
+	}
+	fmt.Println()
+	//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 {
+				//todo: use correct logging of error
+				panic(err)
+			}
+			decoded = append(decoded, decBlock...)
+			start = i + 1
+		}
+	}
+	// save pcm to file
+	err = ioutil.WriteFile(outPath, decoded, 0644)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Saved PCM to " + outPath + ". First 16 bytes: ")
+	for i := 0; i < len(decoded) && i < 16; i++ {
+		fmt.Print(decoded[i], " ")
+	}
+	fmt.Println()
+
+}

cmd/adpcm/cmd/encode/encode.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"flag"
+	"io/ioutil"
+
+	"bitbucket.org/ausocean/av/cmd/adpcm"
+)
+
+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 {
+		panic(err)
+	}
+
+	//encode adpcm
+	var comp []byte
+	start := 0
+	// tCount := 0
+	// tNum := 1
+	for i := 0; i < len(pcm); i++ {
+		if i%1010 == 1009 {
+			block := pcm[start : i+1]
+			// if tCount < tNum {
+			// 	fmt.Println(block[0:16])
+			// 	tCount++
+			// }
+			encBlock, err := adpcm.EncodeBlock(block)
+			if err != nil {
+				//todo: use correct logging of error
+				panic(err)
+			}
+			comp = append(comp, encBlock...)
+			start = i + 1
+		}
+	}
+	// save adpcm to file
+	err = ioutil.WriteFile(adpcmPath, comp, 0644)
+	if err != nil {
+		panic(err)
+	}
+	// fmt.Println("Saved ADPCM to " + adpcmPath + ". First 16 bytes: ")
+	// for i := 0; i < len(comp) && i < 16; i++ {
+	// 	fmt.Println(comp[i])
+	// }
+	// fmt.Println()
+}