安卓 : Merging/concatenating two audio files hangs up the application

Question

我正在使用 mp4parser 附加两个音频文件。追加已完成，但速度很慢，不知道是什么问题。

在这条线上调试器卡住了大音频文件，例如大约 30 分钟的音频文件。

容器输出 = new DefaultMp4Builder().build(result);

这是代码。

Movie[] inMovies = null;
                inMovies = new Movie[]{
                        MovieCreator.build(fileOne),
                        MovieCreator.build(fileTwo)};
                List<Track> audioTracks = new LinkedList<Track>();

                for (Movie m : inMovies) {
                    for (Track t : m.getTracks()) {
                        if (t.getHandler().equals("soun")) {
                            audioTracks.add(t);
                        }
                    }
                }
                Movie result = new Movie();
                if (audioTracks.size() > 0) {
                    result.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()])));
                }
                Container out = new DefaultMp4Builder().build(result);
                String fileName = getFilename();
                FileChannel fc = new RandomAccessFile(String.format(fileName), "rw").getChannel();
                out.writeContainer(fc);
                fc.close();

list 文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ehrlite"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="7"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.READ_LOGS" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ehr_icon"
        android:label="@string/app_name"
        android:name="com.webservice.myApplication"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.ehrlite.LoginActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
             android:windowSoftInputMode="stateVisible|adjustResize"
            >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.ehrlite.MasterActivity"
            android:screenOrientation="portrait">
        </activity>
          <activity
            android:name="com.ehrlite.MainActivity"
            android:screenOrientation="portrait"
            >
        </activity>
        <activity
            android:name="com.ehrlite.PrevMemo"
            android:screenOrientation="portrait">
        </activity>
        <activity
            android:name="com.webviewcall.WebViewActivity"
            android:screenOrientation="portrait">
        </activity>`enter code here`
        <activity
            android:name="com.ehrlite.TranscribedActivity"
            android:screenOrientation="portrait"
            android:configChanges="orientation|keyboardHidden"
            android:windowSoftInputMode="adjustPan">
        </activity>


    </application>

</manifest>

任何人都可以帮助我提高性能， 提前致谢。

Answer 1

我找到了您的答案的解决方案。 我以前遇到过问题。 您正在使用 RandomAccessfile。你需要使用 FileOutputStream

Container out = new DefaultMp4Builder().build(result);
        String outputFilePath = getfilename();
        FileOutputStream fos = new FileOutputStream(new File(outputFilePath));
        out.writeContainer(fos.getChannel());
        fos.close();

引用:

why are java RandomAccessFile so much slower than FileOutputStream?