以下代码应录制音频并以PCM格式存储到SD卡中。 代码正在与我合作，但PCM文件无法播放!!!!
我从此链接获得此代码.... Android : recording audio using audiorecord class play as fast forwarded
我需要播放PCM文件我该怎么做??????
public class Audio_Record extends Activity {
private static final int RECORDER_SAMPLERATE = 8000;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord recorder = null;
private Thread recordingThread = null;
private boolean isRecording = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setButtonHandlers();
enableButtons(false);
int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
System.out.println("BUFFER SIZE VALUE IS " + bufferSize);
}
private void setButtonHandlers() {
((Button) findViewById(R.id.btnStart)).setOnClickListener(btnClick);
((Button) findViewById(R.id.btnStop)).setOnClickListener(btnClick);
}
private void enableButton(int id, boolean isEnable) {
((Button) findViewById(id)).setEnabled(isEnable);
}
private void enableButtons(boolean isRecording) {
enableButton(R.id.btnStart, !isRecording);
enableButton(R.id.btnStop, isRecording);
}
int BufferElements2Rec = 1024; // want to play 2048 (2K) since 2 bytes we
// use only 1024
int BytesPerElement = 2; // 2 bytes in 16bit format
private void startRecording() {
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLERATE, RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
public void run() {
writeAudioDataToFile();
}
}, "AudioRecorder Thread");
recordingThread.start();
}
private byte[] short2byte(short[] sData) {
int shortArrsize = sData.length;
byte[] bytes = new byte[shortArrsize * 2];
for (int i = 0; i < shortArrsize; i++) {
bytes[i * 2] = (byte) (sData[i] & 0x00FF);
bytes[(i * 2) + 1] = (byte) (sData[i] >> 8);
sData[i] = 0;
}
return bytes;
}
private void writeAudioDataToFile() {
// Write the output audio in byte
String filePath = "/sdcard/voice8K16bitmono.pcm";
short sData[] = new short[BufferElements2Rec];
FileOutputStream os = null;
try {
os = new FileOutputStream(filePath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
while (isRecording) {
// gets the voice output from microphone to byte format
recorder.read(sData, 0, BufferElements2Rec);
System.out.println("Short wirting to file" + sData.toString());
try {
// // writes the data to file from buffer
// // stores the voice buffer
byte bData[] = short2byte(sData);
os.write(bData, 0, BufferElements2Rec * BytesPerElement);
} catch (IOException e) {
e.printStackTrace();
}
}
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private void stopRecording() {
// stops the recording activity
if (null != recorder) {
isRecording = false;
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
}
}
private View.OnClickListener btnClick = new View.OnClickListener() {
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnStart: {
enableButtons(true);
startRecording();
break;
}
case R.id.btnStop: {
enableButtons(false);
stopRecording();
break;
}
}
}
};
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
}
return super.onKeyDown(keyCode, event);
}
}
答案 0 :(得分：4)
Android的媒体播放器默认不播放PCM文件。任
AudioTrack 以下是有关如何使用AudioTrack课程播放PCM的教程：（http://jongladwin.blogspot.co.uk/2010/03/android-play-pcmwav-audio-buffer-using.html）
Windows Media Player应该能够播放PCM，这里提到了一些替代方案：（http://www.makeuseof.com/answers/play-pcm-file-pc/）
我猜Android上大多数大型音乐播放器应用都支持PCM。
答案 1 :(得分：3)
我也使用了你的代码，但我的语音记录就像一个＆＃34; zzzzz＆＃34;记录。所以我改变了一点代码，现在我可以通过智能手机和PC（在这种情况下使用Audacity）可以毫无问题地收听并歪曲记录。 这是我的代码：
public class VoiceActivity extends Activity {
private static final String TAG = "VoiceRecord";
private static final int RECORDER_SAMPLERATE = 8000;
private static final int RECORDER_CHANNELS_IN = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_CHANNELS_OUT = AudioFormat.CHANNEL_OUT_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private static final int AUDIO_SOURCE = MediaRecorder.AudioSource.MIC;
// Initialize minimum buffer size in bytes.
private int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS_IN, RECORDER_AUDIO_ENCODING);
private AudioRecord recorder = null;
private Thread recordingThread = null;
private boolean isRecording = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_voice);
((Button) findViewById(R.id.start_button)).setOnClickListener(btnClick);
((Button) findViewById(R.id.stop_button)).setOnClickListener(btnClick);
enableButtons(false);
}
private void enableButton(int id, boolean isEnable) {
((Button) findViewById(id)).setEnabled(isEnable);
}
private void enableButtons(boolean isRecording) {
enableButton(R.id.start_button, !isRecording);
enableButton(R.id.stop_button, isRecording);
}
private void startRecording() {
if( bufferSize == AudioRecord.ERROR_BAD_VALUE)
Log.e( TAG, "Bad Value for \"bufferSize\", recording parameters are not supported by the hardware");
if( bufferSize == AudioRecord.ERROR )
Log.e( TAG, "Bad Value for \"bufferSize\", implementation was unable to query the hardware for its output properties");
Log.e( TAG, "\"bufferSize\"="+bufferSize);
// Initialize Audio Recorder.
recorder = new AudioRecord(AUDIO_SOURCE, RECORDER_SAMPLERATE, RECORDER_CHANNELS_IN, RECORDER_AUDIO_ENCODING, bufferSize);
// Starts recording from the AudioRecord instance.
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
public void run() {
writeAudioDataToFile();
}
}, "AudioRecorder Thread");
recordingThread.start();
}
private void writeAudioDataToFile() {
//Write the output audio in byte
String filePath = "/sdcard/8k16bitMono.pcm";
byte saudioBuffer[] = new byte[bufferSize];
FileOutputStream os = null;
try {
os = new FileOutputStream(filePath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
while (isRecording) {
// gets the voice output from microphone to byte format
recorder.read(saudioBuffer, 0, bufferSize);
try {
// writes the data to file from buffer stores the voice buffer
os.write(saudioBuffer, 0, bufferSize);
} catch (IOException e) {
e.printStackTrace();
}
}
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private void stopRecording() throws IOException {
// stops the recording activity
if (null != recorder) {
isRecording = false;
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
PlayShortAudioFileViaAudioTrack("/sdcard/8k16bitMono.pcm");
}
}
private void PlayShortAudioFileViaAudioTrack(String filePath) throws IOException{
// We keep temporarily filePath globally as we have only two sample sounds now..
if (filePath==null)
return;
//Reading the file..
File file = new File(filePath); // for ex. path= "/sdcard/samplesound.pcm" or "/sdcard/samplesound.wav"
byte[] byteData = new byte[(int) file.length()];
Log.d(TAG, (int) file.length()+"");
FileInputStream in = null;
try {
in = new FileInputStream( file );
in.read( byteData );
in.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Set and push to audio track..
int intSize = android.media.AudioTrack.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS_OUT, RECORDER_AUDIO_ENCODING);
Log.d(TAG, intSize+"");
AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, RECORDER_SAMPLERATE, RECORDER_CHANNELS_OUT, RECORDER_AUDIO_ENCODING, intSize, AudioTrack.MODE_STREAM);
if (at!=null) {
at.play();
// Write the byte array to the track
at.write(byteData, 0, byteData.length);
at.stop();
at.release();
}
else
Log.d(TAG, "audio track is not initialised ");
}
private View.OnClickListener btnClick = new View.OnClickListener() {
public void onClick(View v) {
switch (v.getId()) {
case R.id.start_button: {
enableButtons(true);
startRecording();
break;
}
case R.id.stop_button: {
enableButtons(false);
try {
stopRecording();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
}
}
};
// onClick of backbutton finishes the activity.
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
}
return super.onKeyDown(keyCode, event);
}
}
答案 2 :(得分：2)
这是我的解决方案
public class AudioTrackPlayer {
private String pathAudio;
private AudioTrack audioPlayer;
private Thread mThread;
private int bytesread = 0, ret = 0;
private int size;
private FileInputStream in = null;
private byte[] byteData = null;
private int count = 512 * 1024; // 512 kb
private boolean isPlay = true;
private boolean isLooping = false;
private static Handler mHandler;
public AudioTrackPlayer() {
}
public void prepare(String pathAudio){
this.pathAudio = pathAudio;
mHandler = new Handler();
}
public void play(){
stop();
isPlay = true;
bytesread = 0;
ret = 0;
if (pathAudio == null)
return;
audioPlayer = createAudioPlayer();
if (audioPlayer == null) return;
audioPlayer.play();
mThread = new Thread(new PlayerProcess());
mThread.start();
}
private final Runnable mLopingRunnable = new Runnable() {
@Override
public void run() {
play();
}
};
private AudioTrack createAudioPlayer(){
int intSize = android.media.AudioTrack.getMinBufferSize(16000, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT);
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 16000, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, intSize, AudioTrack.MODE_STREAM);
if (audioTrack == null) {
Log.d("TCAudio", "audio track is not initialised ");
return null;
}
File file = null;
file = new File(pathAudio);
byteData = new byte[(int) count];
try {
in = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
size = (int) file.length();
return audioTrack;
}
private class PlayerProcess implements Runnable{
@Override
public void run() {
while (bytesread < size && isPlay) {
if (Thread.currentThread().isInterrupted()) {
break;
}
try {
ret = in.read(byteData, 0, count);
} catch (IOException e) {
e.printStackTrace();
}
if (ret != -1) { // Write the byte array to the track
audioPlayer.write(byteData,0, ret);
bytesread += ret;
} else break;
}
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
if (audioPlayer!=null){
if (audioPlayer.getState()!=AudioTrack.PLAYSTATE_STOPPED){
audioPlayer.stop();
audioPlayer.release();
mThread = null;
}
}
if (isLooping && isPlay ) mHandler.postDelayed(mLopingRunnable,100);
}
}
public void setLooping(){
isLooping = !isLooping;
}
public void pause(){
}
public void stop(){
isPlay = false;
if (mThread != null) {
mThread.interrupt();
mThread = null;
}
if (audioPlayer != null) {
audioPlayer.stop();
audioPlayer.release();
audioPlayer = null;
}
}
public void reset(){
}
}
答案 3 :(得分：0)
private void startRecording（）{ if（bufferSize == AudioRecord.ERROR_BAD_VALUE） Log.e（标签，“错误值为”bufferSize \“，硬件不支持录制参数”）;
if( bufferSize == AudioRecord.ERROR )
Log.e( TAG, "Bad Value for \"bufferSize\", implementation was unable to query the hardware for its output properties");
Log.e( TAG, "\"bufferSize\"="+bufferSize);
// Initialize Audio Recorder.
recorder = new AudioRecord(AUDIO_SOURCE, RECORDER_SAMPLERATE, AudioFormat.CHANNEL_CONFIGURATION_MONO, RECORDER_AUDIO_ENCODING, bufferSize);
// Starts recording from the AudioRecord instance.
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
public void run() {
writeAudioDataToFile();
}
}, "AudioRecorder Thread");
recordingThread.start();
}
替换录制代码......