audio - 黑莓录音示例代码

Question

有谁知道一个很好的存储库来获取黑莓的示例代码？具体来说，可以帮助我学习录制音频的机制，甚至可能对其进行采样并对其进行一些动态信号处理的示例？

我想读取传入的音频，如果需要，逐个采样，然后对其进行处理以产生所需的结果，在这种情况下是可视化器。

Answer 1

RIM API 包含 JSR 135 Java Mobile Media API用于处理音频和视频内容。
您更正了 BB 知识库上的困惑情况。唯一的方法是浏览它，希望他们不会再更改站点地图。
它是 Developers->Resources -> Knowledge Base -> Java API's&Samples -> Audio&Video

声音录制

基本上录制音频很简单:

创建具有正确音频编码的播放器

获取 RecordControl

开始录音

停止录音

链接:
RIM 4.6.0 API ref: Package javax.microedition.media
How To - Record Audio on a BlackBerry smartphone
How To - Play audio in an application
How To - Support streaming audio to the media application
How To - Specify Audio Path Routing
How To - Obtain the media playback time from a media application
What Is - Supported audio formats
What Is - Media application error codes

录音样本

声明了带有 Player、RecordControl 和资源的线程:

final class VoiceNotesRecorderThread extends Thread{
   private Player _player;
   private RecordControl _rcontrol;
   private ByteArrayOutputStream _output;
   private byte _data[];

   VoiceNotesRecorderThread() {}

   private int getSize(){
       return (_output != null ? _output.size() : 0);
   }

   private byte[] getVoiceNote(){
      return _data;
   }
}

在 Thread.run() 开始录音:

   public void run() {
      try {
          // Create a Player that captures live audio.
          _player = Manager.createPlayer("capture://audio");
          _player.realize();    
          // Get the RecordControl, set the record stream,
          _rcontrol = (RecordControl)_player.getControl("RecordControl");    
          //Create a ByteArrayOutputStream to capture the audio stream.
          _output = new ByteArrayOutputStream();
          _rcontrol.setRecordStream(_output);
          _rcontrol.startRecord();
          _player.start();    
      } catch (final Exception e) {
         UiApplication.getUiApplication().invokeAndWait(new Runnable() {
            public void run() {
               Dialog.inform(e.toString());
            }
         });
      }
   }

并且在 thread.stop() 记录停止:

   public void stop() {
      try {
           //Stop recording, capture data from the OutputStream,
           //close the OutputStream and player.
           _rcontrol.commit();
           _data = _output.toByteArray();
           _output.close();
           _player.close();    
      } catch (Exception e) {
         synchronized (UiApplication.getEventLock()) {
            Dialog.inform(e.toString());
         }
      }
   }

处理和采样音频流

在录制结束时，您将获得充满特定音频格式数据的输出流。因此，要对其进行处理或采样，您必须解码此音频流。

谈到动态处理，那将更加复杂。您将不得不在录制期间读取输出流而不提交录制。所以会有几个问题需要解决:

同步访问记录器和采样器的输出流 - 线程问题

读取正确数量的音频数据 - 深入音频格式解码以找出标记规则

也可能有用:
java.net: Experiments in Streaming Content in Java ME by Vikram Goyal