1// Copyright 2011 Dmitry Chestnykh. All rights reserved.
 2// Use of this source code is governed by a MIT-style
 3// license that can be found in the LICENSE file.
 4
 5// generate is a tool to generate sounds.go from WAVE files.
 6//
 7// It creates (or rewrites) sounds.go in the parent directory.
 8package main
 9
10import (
11	"fmt"
12	"os"
13	"io"
14	"io/ioutil"
15	"log"
16	"path/filepath"
17)
18
19const headerLen = 44
20
21var langs = []string{"en", "ru"}
22
23func writeVar(w io.Writer, b []byte, prefix string) {
24	i := 0
25	for j, v := range b {
26		fmt.Fprintf(w, "0x%02x,", v)
27		i++
28		if i == 11 {
29			fmt.Fprintf(w, "\n")
30			if j != len(b)-1 {
31				fmt.Fprintf(w, prefix)
32			}
33			i = 0
34		} else {
35			if j != len(b)-1 {
36				fmt.Fprintf(w, " ")
37			}
38		}
39	}
40	if i > 0 {
41		fmt.Fprintf(w, "\n")
42	}
43}
44
45func writeFileRep(pcm io.Writer, name, prefix string) {
46	b, err := ioutil.ReadFile(name)
47	if err != nil {
48		log.Fatalf("%s", err)
49	}
50	writeVar(pcm, b[headerLen:], prefix)
51}
52
53func writeSingle(pcm io.Writer, name string) {
54	fmt.Fprintf(pcm, "\nvar %sSound = []byte{\n\t", name)
55	writeFileRep(pcm, name+".wav", "\t")
56	fmt.Fprintf(pcm, "}\n")
57}
58
59func writeDigitSounds(pcm io.Writer, lang string) {
60	fmt.Fprintf(pcm, "\t\"%s\": [][]byte{\n", lang)
61	for i := 0; i <= 9; i++ {
62		fmt.Fprintf(pcm, "\t\t{ // %d\n\t\t\t", i)
63		writeFileRep(pcm, filepath.Join(lang, fmt.Sprintf("%d.wav", i)), "\t\t\t")
64		fmt.Fprintf(pcm, "\t\t},\n")
65	}
66	fmt.Fprintf(pcm, "\t},\n")
67}
68
69func main() {
70	pcm, err := os.Create(filepath.Join("..", "sounds.go"))
71	if err != nil {
72		log.Fatalf("%s", err)
73	}
74	defer pcm.Close()
75	fmt.Fprintf(pcm, `package captcha
76
77// This file has been generated from .wav files using generate.go.
78
79var waveHeader = []byte{
80	0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56, 0x45,
81	0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
82	0x40, 0x1f, 0x00, 0x00, 0x40, 0x1f, 0x00, 0x00, 0x01, 0x00, 0x08, 0x00,
83	0x64, 0x61, 0x74, 0x61,
84}
85
86// Byte slices contain raw 8 kHz unsigned 8-bit PCM data (without wav header).
87
88`)
89	fmt.Fprintf(pcm, "var digitSounds = map[string][][]byte{\n")
90	for _, lang := range langs {
91		writeDigitSounds(pcm, lang)
92	}
93	fmt.Fprintf(pcm, "}\n")
94	writeSingle(pcm, "beep")
95}