TextToSpeech,playEarcon和.wav文件

Question

在我的一个应用程序中,我有一个活动,语音合成字母数字参考字符串,字母/数字/字母/数字,例如"ABC123"听起来像"Ay,bee,sea,one two three".由于这是一组有限的声音,我认为通过使用playEarcon方法播放数字和字母的预先录制的.wav文件,使TTS引擎无需互联网连接即可工作.

我已将所有36个wav文件放在res/raw文件夹中,并在初始化TTS引擎时将资源ID映射到字母.这很好用,但是.apk现在要大得多,因为wav文件在apk中未压缩存储.我想让apk的尺寸更小.

在另一个问题的答案中,它指出wav文件被排除在压缩之外.(我不明白为什么,因为他们通常拉低到原来的约40%)一个检查apk的内部,这似乎是真的.

由于代码中没有引用资源文件的扩展名,我尝试将wavs重命名为.waw,.abc,.spc.所有这些都被压缩但不幸的是,playEarcon方法在调用时不会产生声音,除非扩展名为.wav.

总之,我想强制TTS引擎在没有wav扩展名的情况下播放文件,或者说服它来压缩.wav文件.

将非常感谢所有建议.值得我发布下面最小的可证明代码示例.我的工作文件名为gb_a.wav,gb_b.wav等.如果扩展名已更改,则会停止发声.

public class WavSpeakerActivity extends Activity implements
        RadioGroup.OnCheckedChangeListener, TextToSpeech.OnInitListener {

    static final int mGBLetterResIds[] = { R.raw.gb_a, R.raw.gb_b, R.raw.gb_c,
            R.raw.gb_d, R.raw.gb_e, R.raw.gb_f, R.raw.gb_g, R.raw.gb_h,
            R.raw.gb_i, R.raw.gb_j, R.raw.gb_k, R.raw.gb_l, R.raw.gb_m,
            R.raw.gb_n, R.raw.gb_o, R.raw.gb_p, R.raw.gb_q, R.raw.gb_r,
            R.raw.gb_s, R.raw.gb_t, R.raw.gb_u, R.raw.gb_v, R.raw.gb_w,
            R.raw.gb_x, R.raw.gb_y, R.raw.gb_z };
    static final int mGBNumberResIds[] = { R.raw.gb_zero, R.raw.gb_one,
            R.raw.gb_two, R.raw.gb_three, R.raw.gb_four, R.raw.gb_five,
            R.raw.gb_six, R.raw.gb_seven, R.raw.gb_eight, R.raw.gb_nine };

    static final String mGbStr = "GB";
    static final String mAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    static final String mNumbers = "0123456789";
    private String mPpackageName = null;
    private String mTextToSpeak = null;
    private RadioGroup mRadioGroup = null;// two buttons one sets letters, the other numbers
    private TextToSpeech mTts = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mTts = new TextToSpeech(this, this);
        mRadioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
        mRadioGroup.setOnCheckedChangeListener(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        RadioGroup rg = (RadioGroup) findViewById(R.id.radioGroup1);
        switchText(rg);
        mPpackageName = getPackageName();
    }

    @Override
    public void onDestroy() {
        // Don't forget to shutdown speech engine
        if (mTts != null) {
            mTts.stop();
            mTts.shutdown();
        }
        super.onDestroy();
    }

    private void switchText(RadioGroup rg) {
        // select letters or digits as the String to speak
        int checkedButton = rg.getCheckedRadioButtonId();
        switch (checkedButton) {
            case R.id.alphabet:
                mTextToSpeak = mAlphabet;
                break;
            case R.id.numbers:
                mTextToSpeak = mNumbers;
                break;
        }
    }

    public void myClickHandler(View target) {
        // Just the one button has been clicked - the 'Speak' one
        String earconKey;
        String lang = Locale.UK.getCountry(); // will be "GB", just have UK in this small example
        mTts.setLanguage(Locale.UK); // skip error checking for brevity's sake
        String text = mTextToSpeak.replaceAll("\\s", "");// remove spaces (if any)
        char c;
        for (int i = 0; i < text.length(); i++) {
            c = text.charAt(i);
            if ( Character.isLetter(c) || Character.isDigit(c) ) {
                earconKey = lang + Character.toString(c); // GBA, GBB..GBZ, GB0.. GB9
                mTts.playEarcon(earconKey, TextToSpeech.QUEUE_ADD, null);
            }
        }
    }

    @Override
    public void onInit(int status) {
        // doesn't seem we need to check status or setLanguage if we're just playing earcons
        mapEarCons(); // map letter/digit sounds to resource ids
    }

    private void mapEarCons() {
        String key;
        for (char c = 'A'; c <= 'Z' ; c++){
            key = mGbStr + Character.toString(c); // GBA, GBB .. GBZ
            mTts.addEarcon(key, mPpackageName, mGBLetterResIds[c - 'A'] );// add it
        }
        for (int i = 0 ; i <= 9; i++){
            key = mGbStr + Integer.toString(i); // GB0, GB1 .. GB9
            mTts.addEarcon(key, mPpackageName, mGBNumberResIds[i] );
        }
    }

    @Override
    public void onCheckedChanged(RadioGroup rg, int arg1) { switchText(rg); }
}

..

Answer 1

1. 为什么不尝试压缩 wav 文件：根据维基百科， wav 文件是数据的容器。最常用于未压缩的 PCM 声音，但也可用于存储使用各种编解码器压缩的数据（wFormatTags例如，您可以在此处找到（存储数据的类型）的可能值）。
2. 您可以将资源保存到本地文件系统并addEarcon(String earcon, String filename)使用addEarcon(String earcon, String packagename, int resourceId).
3. 您可以使用 aapt 和-0 wavcmd 行开关来制作包含从压缩类型中排除的 wav 文件的 apk。