我们假设我们有以下情况:某些东西正在
Android设备上播放(一个mp3的例子,但它可以是使用Android设备的音频部分的任何东西).从应用程序(android应用程序:)),我想拦截音频流来分析它,记录它等.从这个应用程序(让我们说“分析器”)我不想启动一个mp3或某事所有我想要的是访问android的音频流.
任何建议是赞赏,它可以是Java或C解决方案.
解决方法
http://developer.android.com/reference/android/media/MediaRecorder.html
public class AudioRecorder { final MediaRecorder recorder = new MediaRecorder(); final String path; /** * Creates a new audio recording at the given path (relative to root of SD * card). */ public AudioRecorder(String path) { this.path = sanitizePath(path); } private String sanitizePath(String path) { if (!path.startsWith("/")) { path = "/" + path; } if (!path.contains(".")) { path += ".3gp"; } return Environment.getExternalStorageDirectory().getAbsolutePath() + path; } /** * Starts a new recording. */ public void start() throws IOException { String state = android.os.Environment.getExternalStorageState(); if (!state.equals(android.os.Environment.MEDIA_MOUNTED)) { throw new IOException("SD Card is not mounted. It is " + state + "."); } // make sure the directory we plan to store the recording in exists File directory = new File(path).getParentFile(); if (!directory.exists() && !directory.mkdirs()) { throw new IOException("Path to file could not be created."); } recorder.setAudioSource(MediaRecorder.AudioSource.MIC); recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); recorder.setOutputFile(path); recorder.prepare(); recorder.start(); } /** * Stops a recording that has been prevIoUsly started. */ public void stop() throws IOException { recorder.stop(); recorder.release(); } }