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/filepath"
13)
14
15const headerLen = 44
16
17var langs = []string{"en", "ru"}
18
19func writeVar(w io.Writer, b []byte, prefix string) {
20	i := 0
21	for j, v := range b {
22		fmt.Fprintf(w, "0x%02x,", v)
23		i++
24		if i == 11 {
25			fmt.Fprintf(w, "\n")
26			if j != len(b)-1 {
27				fmt.Fprintf(w, prefix)
28			}
29			i = 0
30		} else {
31			if j != len(b)-1 {
32				fmt.Fprintf(w, " ")
33			}
34		}
35	}
36	if i > 0 {
37		fmt.Fprintf(w, "\n")
38	}
39}
40
41func writeFileRep(pcm io.Writer, name, prefix string) {
42	b, err := ioutil.ReadFile(name)
43	if err != nil {
44		log.Fatalf("%s", err)
45	}
46	writeVar(pcm, b[headerLen:], prefix)
47}
48
49func writeSingle(pcm io.Writer, name string) {
50	fmt.Fprintf(pcm, "\nvar %sSound = []byte{\n\t", name)
51	writeFileRep(pcm, name+".wav", "\t")
52	fmt.Fprintf(pcm, "}\n")
53}
54
55func writeDigitSounds(pcm io.Writer, lang string) {
56	fmt.Fprintf(pcm, "\t\"%s\" : [][]byte{\n", lang)
57	for i := 0; i <= 9; i++ {
58		fmt.Fprintf(pcm, "\t\t{ // %d\n\t\t\t", i)
59		writeFileRep(pcm, filepath.Join(lang, fmt.Sprintf("%d.wav", i)), "\t\t\t")
60		fmt.Fprintf(pcm, "\t\t},\n")
61	}
62	fmt.Fprintf(pcm, "\t},\n")
63}
64
65func main() {
66	pcm, err := os.Create(filepath.Join("..", "sounds.go"))
67	if err != nil {
68		log.Fatalf("%s", err)
69	}
70	defer pcm.Close()
71	fmt.Fprintf(pcm, `package captcha
72
73// This file has been generated from .wav files using generate.go.
74
75var waveHeader = []byte{
76	0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56, 0x45,
77	0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
78	0x40, 0x1f, 0x00, 0x00, 0x40, 0x1f, 0x00, 0x00, 0x01, 0x00, 0x08, 0x00,
79	0x64, 0x61, 0x74, 0x61,
80}
81
82// Byte slices contain raw 8 kHz unsigned 8-bit PCM data (without wav header).
83
84`)
85	fmt.Fprintf(pcm, "var digitSounds = map[string][][]byte{\n")
86	for _, lang := range langs {
87		writeDigitSounds(pcm, lang)
88	}
89	fmt.Fprintf(pcm, "}\n")
90	writeSingle(pcm, "beep")
91}