5
我有一个流式传输网址在我的应用程序流，我也记录相同的文件也可以离线听。我可以在媒体播放器和服务的帮助下流式传输URL，但现在我正在寻找同一个文件的记录逻辑。如何录制和保存为MP3在线流媒体音频
如何记录实时流并将文件保存到SD卡上？
A
回答
2
我觉得你的问题解决有：
https://stackoverflow.com/a/5384161/2545832
尝试通过字节操作做一个字节。它由这家伙起作用。
希望它有帮助！
编辑：
抱歉，没有看到评论！
1
您必须通过本地套接字服务器传递音频流量。看到这里我的答案：
Android > 4.0 : Ideas how to record/capture internal audio (e.g. STREAM_MUSIC)?
0
如果你正在处理的音频数据，那么用它代替MediaRecorder类AudioRecord类。
有一个在线示例代码，您可以下载并测试您的应用程序。
如前所述，
的这篇文章记录音频的示例应用程序并将其保存到 的SD卡。该文件将为WAV文件，并将以文件名 的名称与当前毫秒放置在 “/ SDCard/AudioRecorder”文件夹中。
检查文章android-audio-recording-part-2/。
侧面说明：
如果你想保存在MP3格式录制的文件，然后修改源代码文件RecorderActivity.java。在那里你会看到行private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav";。
更改它作为private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".mp3";
OR
您可以修改变量名太或需要由应用程序相关的代码。
祝你好运！
2
我假设你不想使用你的麦克风录制音频流，而是下载原始音频文件，那么你正在寻找什么叫做渐进式下载，here是一个很好的教程来设置它与MediaController，基本上你首先开始下载文件，当你下载它的时候，你用本地播放器读取缓冲文件作为数据源。
从上面的链接，你可以使用StreamingMediaPlayer，原来的安卓系统MediaPlayer还不支持从外部URL流媒体，所以这个类提供了一个伪流功能，通过增量下载内容&播放，只要我们获得足够的音频临时存储。
public class StreamingMediaPlayer {
private static final int INTIAL_KB_BUFFER = 96*10/8;//assume 96kbps*10secs/8bits per byte
private TextView textStreamed;
private ImageButton playButton;
private ProgressBar progressBar;
// Track for display by progressBar
private long mediaLengthInKb, mediaLengthInSeconds;
private int totalKbRead = 0;
// Create Handler to call View updates on the main UI thread.
private final Handler handler = new Handler();
private MediaPlayer mediaPlayer;
private File downloadingMediaFile;
private boolean isInterrupted;
private Context context;
private int counter = 0;
public StreamingMediaPlayer(Context context,TextView textStreamed, ImageButton playButton, Button streamButton,ProgressBar progressBar)
{
this.context = context;
this.textStreamed = textStreamed;
this.playButton = playButton;
this.progressBar = progressBar;
}
/**
* Progressivly download the media to a temporary location and update the MediaPlayer as new content becomes available.
*/
public void startStreaming(final String mediaUrl, long mediaLengthInKb, long mediaLengthInSeconds) throws IOException {
this.mediaLengthInKb = mediaLengthInKb;
this.mediaLengthInSeconds = mediaLengthInSeconds;
Runnable r = new Runnable() {
public void run() {
try {
downloadAudioIncrement(mediaUrl);
} catch (IOException e) {
Log.e(getClass().getName(), "Unable to initialize the MediaPlayer for fileUrl=" + mediaUrl, e);
return;
}
}
};
new Thread(r).start();
}
/**
* Download the url stream to a temporary location and then call the setDataSource
* for that local file
*/
public void downloadAudioIncrement(String mediaUrl) throws IOException {
URLConnection cn = new URL(mediaUrl).openConnection();
cn.connect();
InputStream stream = cn.getInputStream();
if (stream == null) {
Log.e(getClass().getName(), "Unable to create InputStream for mediaUrl:" + mediaUrl);
}
downloadingMediaFile = new File(context.getCacheDir(),"downloadingMedia_" + (counter++) + ".dat");
FileOutputStream out = new FileOutputStream(downloadingMediaFile);
byte buf[] = new byte[16384];
int totalBytesRead = 0, incrementalBytesRead = 0;
do {
int numread = stream.read(buf);
if (numread <= 0)
break;
out.write(buf, 0, numread);
totalBytesRead += numread;
incrementalBytesRead += numread;
totalKbRead = totalBytesRead/1000;
testMediaBuffer();
fireDataLoadUpdate();
} while (validateNotInterrupted());
stream.close();
if (validateNotInterrupted()) {
fireDataFullyLoaded();
}
}
private boolean validateNotInterrupted() {
if (isInterrupted) {
if (mediaPlayer != null) {
mediaPlayer.pause();
//mediaPlayer.release();
}
return false;
} else {
return true;
}
}
/**
* Test whether we need to transfer buffered data to the MediaPlayer.
* Interacting with MediaPlayer on non-main UI thread can causes crashes to so perform this using a Handler.
*/
private void testMediaBuffer() {
Runnable updater = new Runnable() {
public void run() {
if (mediaPlayer == null) {
// Only create the MediaPlayer once we have the minimum buffered data
if (totalKbRead >= INTIAL_KB_BUFFER) {
try {
startMediaPlayer();
} catch (Exception e) {
Log.e(getClass().getName(), "Error copying buffered conent.", e);
}
}
} else if (mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000){
// NOTE: The media player has stopped at the end so transfer any existing buffered data
// We test for < 1second of data because the media player can stop when there is still
// a few milliseconds of data left to play
transferBufferToMediaPlayer();
}
}
};
handler.post(updater);
}
private void startMediaPlayer() {
try {
File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".dat");
moveFile(downloadingMediaFile,bufferedFile);
Log.e("Player",bufferedFile.length()+"");
Log.e("Player",bufferedFile.getAbsolutePath());
mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(bufferedFile.getAbsolutePath());
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.prepare();
fireDataPreloadComplete();
} catch (IOException e) {
Log.e(getClass().getName(), "Error initializing the MediaPlaer.", e);
return;
}
}
/**
* Transfer buffered data to the MediaPlayer.
* Interacting with MediaPlayer on non-main UI thread can causes crashes to so perform this using a Handler.
*/
private void transferBufferToMediaPlayer() {
try {
// First determine if we need to restart the player after transferring data...e.g. perhaps the user pressed pause
boolean wasPlaying = mediaPlayer.isPlaying();
int curPosition = mediaPlayer.getCurrentPosition();
mediaPlayer.pause();
File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".dat");
//FileUtils.copyFile(downloadingMediaFile,bufferedFile);
mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(bufferedFile.getAbsolutePath());
//mediaPlayer.setAudioStreamType(AudioSystem.STREAM_MUSIC);
mediaPlayer.prepare();
mediaPlayer.seekTo(curPosition);
// Restart if at end of prior beuffered content or mediaPlayer was previously playing.
// NOTE: We test for < 1second of data because the media player can stop when there is still
// a few milliseconds of data left to play
boolean atEndOfFile = mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000;
if (wasPlaying || atEndOfFile){
mediaPlayer.start();
}
}catch (Exception e) {
Log.e(getClass().getName(), "Error updating to newly loaded content.", e);
}
}
private void fireDataLoadUpdate() {
Runnable updater = new Runnable() {
public void run() {
textStreamed.setText((CharSequence) (totalKbRead + " Kb read"));
float loadProgress = ((float)totalKbRead/(float)mediaLengthInKb);
progressBar.setSecondaryProgress((int)(loadProgress*100));
}
};
handler.post(updater);
}
/**
* We have preloaded enough content and started the MediaPlayer so update the buttons & progress meters.
*/
private void fireDataPreloadComplete() {
Runnable updater = new Runnable() {
public void run() {
mediaPlayer.start();
startPlayProgressUpdater();
playButton.setEnabled(true);
//streamButton.setEnabled(false);
}
};
handler.post(updater);
}
private void fireDataFullyLoaded() {
Runnable updater = new Runnable() {
public void run() {
transferBufferToMediaPlayer();
textStreamed.setText((CharSequence) ("Audio full loaded: " + totalKbRead + " Kb read"));
}
};
handler.post(updater);
}
public MediaPlayer getMediaPlayer() {
return mediaPlayer;
}
public void startPlayProgressUpdater() {
float progress = (((float)mediaPlayer.getCurrentPosition()/1000)/(float)mediaLengthInSeconds);
progressBar.setProgress((int)(progress*100));
if (mediaPlayer.isPlaying()) {
Runnable notification = new Runnable() {
public void run() {
startPlayProgressUpdater();
}
};
handler.postDelayed(notification,1000);
}
}
public void interrupt() {
playButton.setEnabled(false);
isInterrupted = true;
validateNotInterrupted();
}
public void moveFile(File oldLocation, File newLocation)
throws IOException {
if (oldLocation.exists()) {
BufferedInputStream reader = new BufferedInputStream(new FileInputStream(oldLocation));
BufferedOutputStream writer = new BufferedOutputStream(new FileOutputStream(newLocation, false));
try {
byte[] buff = new byte[8192];
int numChars;
while ((numChars = reader.read( buff, 0, buff.length)) != -1) {
writer.write(buff, 0, numChars);
}
} catch(IOException ex) {
throw new IOException("IOException when transferring " + oldLocation.getPath() + " to " + newLocation.getPath());
} finally {
try {
if (reader != null){
writer.close();
reader.close();
}
} catch(IOException ex){
Log.e(getClass().getName(),"Error closing files when transferring " + oldLocation.getPath() + " to " + newLocation.getPath());
}
}
} else {
throw new IOException("Old location does not exist when transferring " + oldLocation.getPath() + " to " + newLocation.getPath());
}
}
}
然后你就可以轻松地使用它像：
private void startStreamingAudio() {
try {
final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progress_bar);
if (audioStreamer != null) {
audioStreamer.interrupt();
}
audioStreamer = new StreamingMediaPlayer(this,textStreamed, playButton, streamButton,progressBar);
audioStreamer.startStreaming("http://www.pocketjourney.com/downloads/pj/tutorials/audio.mp3",1677, 214);
//streamButton.setEnabled(false);
} catch (IOException e) {
Log.e(getClass().getName(), "Error starting to stream audio.", e);
}
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在http://stackoverflow.com/questions/6959930/android-need-to-record-mic可能回答-input – tuxnani
And http://stackoverflow.com/questions/5381969/android-how-to-record-mp3-radio-audio-stream – tuxnani