我正在创建一个录制音频的应用程序。为此我正在使用AudioRecord类。我正在将录制的pcm文件转换为WAV格式。问题是，当我播放录制的音频时，声音播放就像它的快速转发。我做了一些研究，但仍然没有成功。请帮助我 代码
/*Recording Audio*/
/*Sampling rate*/
private static final String AUDIO_RECORDER_FOLDER = "Active Audio";
private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
private static final int SAMPLING_RATE = 44100;
private int mBufferSize;
private short[] mAudioBuffer;
private int BufferElements2Rec = 1024; // want to play 2048 (2K) since 2 bytes we use only 1024
private int BytesPerElement = 2; // 2 bytes in 16bit format
private AudioRecord audioRecord;
private boolean isRecording = false;
private RecordingThread recordingThread;
主题
/*Recording stuff*/
// Compute the minimum required audio buffer size and allocate the buffer.
mBufferSize = AudioRecord.getMinBufferSize(SAMPLING_RATE, AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT);
mAudioBuffer = new short[mBufferSize / 2];
recordingThread = new RecordingThread();/*Recording stuff*/
// Compute the minimum required audio buffer size and allocate the buffer.
mBufferSize = AudioRecord.getMinBufferSize(SAMPLING_RATE, AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT);
recordingThread = new RecordingThread();
public void run() {
if (getValidSampleRates()) {
audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLING_RATE,
AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, BufferElements2Rec * BytesPerElement);
if (audioRecord.getState() == AudioRecord.STATE_INITIALIZED) {
audioRecord.startRecording();
} else {
if (Constants.isLoggingEnable) {
Logger.logError(TAG, "Error occured");
}
}
} else {
Toast.makeText(context, "Sampling rate not supported", Toast.LENGTH_SHORT).show();
}
synchronized (this) {
if (pause) {
pause = false;
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
if (isRecording) {
writeAudioDataToFile();
}
}
}
if (isRecording) {
writeAudioDataToFile();
}
}
public synchronized void pause() {
pause = true;
}
public synchronized void go() {
this.notify();
}
}
将数据写入文件
private void writeAudioDataToFile() {
// Write the output audio in byte
String fileName = getTempFilename();
short sData[] = new short[mBufferSize];
FileOutputStream os = null;
try {
os = new FileOutputStream(fileName);
} catch (FileNotFoundException e) {
if (Constants.isLoggingEnable) {
Logger.logError(TAG, e.getLocalizedMessage());
}
}
while (isRecording) {
// gets the voice output from microphone to byte format
audioRecord.read(sData, 0, mBufferSize);
mWaveformView.updateAudioData(sData);
if (Constants.isLoggingEnable) {
Logger.logError(TAG, "Recording is working");
}
try {
// // writes the data to file from buffer
// // stores the voice buffer
byte bData[] = short2byte(sData);
os.write(bData);
} catch (IOException e) {
if (Constants.isLoggingEnable) {
Logger.logError(TAG, e.getLocalizedMessage());
}
}
}
try {
os.close();
} catch (IOException e) {
if (Constants.isLoggingEnable) {
Logger.logError(TAG, e.getLocalizedMessage());
}
}
// copyWaveFile(getTempFilename(), getFilename());
// deleteTempFile();
}
private void deleteTempFile() {
File file = new File(getTempFilename());
file.delete();
}
将PCM格式转换为WAV数据
private void WriteWaveFileHeader(
FileOutputStream out, long totalAudioLen,
long totalDataLen, long longSampleRate, int channels,
long byteRate) throws IOException {
byte[] header = new byte[44];
header[0] = 'R'; // RIFF/WAVE header
header[1] = 'I';
header[2] = 'F';
header[3] = 'F';
header[4] = (byte) (totalDataLen & 0xff);
header[5] = (byte) ((totalDataLen >> 8) & 0xff);
header[6] = (byte) ((totalDataLen >> 16) & 0xff);
header[7] = (byte) ((totalDataLen >> 24) & 0xff);
header[8] = 'W';
header[9] = 'A';
header[10] = 'V';
header[11] = 'E';
header[12] = 'f'; // 'fmt ' chunk
header[13] = 'm';
header[14] = 't';
header[15] = ' ';
header[16] = 16; // 4 bytes: size of 'fmt ' chunk
header[17] = 0;
header[18] = 0;
header[19] = 0;
header[20] = 1; // format = 1
header[21] = 0;
header[22] = (byte) channels;
header[23] = 0;
header[24] = (byte) (longSampleRate & 0xff);
header[25] = (byte) ((longSampleRate >> 8) & 0xff);
header[26] = (byte) ((longSampleRate >> 16) & 0xff);
header[27] = (byte) ((longSampleRate >> 24) & 0xff);
header[28] = (byte) (byteRate & 0xff);
header[29] = (byte) ((byteRate >> 8) & 0xff);
header[30] = (byte) ((byteRate >> 16) & 0xff);
header[31] = (byte) ((byteRate >> 24) & 0xff);
header[32] = (byte) (2 * 16 / 8); // block align
header[33] = 0;
header[34] = 16; // bits per sample
header[35] = 0;
header[36] = 'd';
header[37] = 'a';
header[38] = 't';
header[39] = 'a';
header[40] = (byte) (totalAudioLen & 0xff);
header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
header[43] = (byte) ((totalAudioLen >> 24) & 0xff);
out.write(header, 0, 44);
}
private void copyWaveFile(String inFilename, String outFilename) {
FileInputStream in = null;
FileOutputStream out = null;
long totalAudioLen = 0;
long totalDataLen = totalAudioLen + 36;
long longSampleRate = SAMPLING_RATE;
int channels = 2;
long byteRate = 16 * SAMPLING_RATE * channels / 8;
byte[] data = new byte[mBufferSize];
try {
in = new FileInputStream(inFilename);
out = new FileOutputStream(outFilename);
totalAudioLen = in.getChannel().size();
totalDataLen = totalAudioLen + 36;
WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
longSampleRate, channels, byteRate);
while (in.read(data) != -1) {
out.write(data);
}
in.close();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private String getFilename() {
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath, AUDIO_RECORDER_FOLDER);
if (!file.exists()) {
file.mkdirs();
}
return (file.getAbsolutePath() + "/audio.wav");
}
private String getTempFilename() {
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath, AUDIO_RECORDER_FOLDER);
if (!file.exists()) {
file.mkdirs();
}
File tempFile = new File(filepath, AUDIO_RECORDER_TEMP_FILE);
if (tempFile.exists())
tempFile.delete();
return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);
}
我出错的地方？请帮帮我。 谢谢：）