1// generate is a tool to generate sounds.go from WAVE files.
 2//
 3// It creates (or rewrites) sounds.go in the parent directory.
 4package main
 5
 6import (
 7	"fmt"
 8	"os"
 9	"io"
10	"io/ioutil"
11	"log"
12	"path"
13)
14
15const headerLen = 44
16
17func writeVar(w io.Writer, b []byte, prefix string) {
18	i := 0
19	for j, v := range b {
20		fmt.Fprintf(w, "0x%02x,", v)
21		i++
22		if i == 11 {
23			fmt.Fprintf(w, "\n")
24			if j != len(b)-1 {
25				fmt.Fprintf(w, prefix)
26			}
27			i = 0
28		} else {
29			if j != len(b)-1 {
30				fmt.Fprintf(w, " ")
31			}
32		}
33	}
34	if i > 0 {
35		fmt.Fprintf(w, "\n")
36	}
37}
38
39func writeFileRep(pcm io.Writer, name, prefix string) {
40	b, err := ioutil.ReadFile(name)
41	if err != nil {
42		log.Fatalf("%s", err)
43	}
44	writeVar(pcm, b[headerLen:], prefix)
45}
46
47func writeSingle(pcm io.Writer, name string) {
48	fmt.Fprintf(pcm, "\nvar %sSound = []byte{\n\t", name)
49	writeFileRep(pcm, name+".wav", "\t")
50	fmt.Fprintf(pcm, "}\n")
51}
52
53func writeDigitSounds(pcm io.Writer) {
54	fmt.Fprintf(pcm, "var digitSounds = [][]byte{\n")
55	for i := 0; i <= 9; i++ {
56		fmt.Fprintf(pcm, "\t{ // %d\n\t\t", i)
57		writeFileRep(pcm, fmt.Sprintf("%d.wav", i), "\t\t")
58		fmt.Fprintf(pcm, "\t},\n")
59	}
60	fmt.Fprintf(pcm, "}\n")
61}
62
63func main() {
64	pcm, err := os.Create(path.Join("..", "sounds.go"))
65	if err != nil {
66		log.Fatalf("%s", err)
67	}
68	defer pcm.Close()
69	fmt.Fprintf(pcm, `package captcha
70
71// This file has been generated from .wav files using generate.go.
72
73var waveHeader = []byte{
74	0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56, 0x45,
75	0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
76	0x40, 0x1f, 0x00, 0x00, 0x40, 0x1f, 0x00, 0x00, 0x01, 0x00, 0x08, 0x00,
77	0x64, 0x61, 0x74, 0x61,
78}
79
80// Byte slices contain raw 8 kHz unsigned 8-bit PCM data (without wav header).
81
82`)
83	writeDigitSounds(pcm)
84	writeSingle(pcm, "beep")
85}