我正在尝试录制一个PCM音频文件并进行回放。当我回放时,声音听起来很慢,播放时间比录制时间长。我不确定错误是在记录还是播放代码中。有什么想法吗?
我主要从这个示例复制了代码:http://emeadev.blogspot.com/2009/09/raw-audio-manipulation-in-android.html 以下是记录代码(isRecording标志由GUI线程中的停止按钮设置)。
我主要从这个示例复制了代码:http://emeadev.blogspot.com/2009/09/raw-audio-manipulation-in-android.html 以下是记录代码(isRecording标志由GUI线程中的停止按钮设置)。
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
int sampleRateInHz = 8000;//8000 44100, 22050 and 11025
int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;
int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
File sd = Environment.getExternalStorageDirectory();
File file = new File(sd, "msg.wav");
if (file.exists())
file.delete();
try {
file.createNewFile();
} catch (IOException e) {
Log.e("create file:", e.toString());
}
try {
OutputStream os = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(os);
DataOutputStream dos = new DataOutputStream(bos);
int bufferSize = AudioRecord.getMinBufferSize(sampleRateInHz,channelConfig, audioFormat);
short[] buffer = new short[bufferSize];
audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,
sampleRateInHz,channelConfig, audioFormat,bufferSize);
audioRecord.startRecording();
isRecording = true;
while (isRecording) {
int bufferReadResult = audioRecord.read(buffer, 0, bufferSize);
for (int i = 0; i < bufferReadResult; i++)
{
dos.writeShort(buffer[i]);
}
}
dos.close();
这是一个示例代码。
File file = new File(SendAlert.voiceFile);
// Get the length of the audio stored in the file (16 bit so 2 bytes per short)
// and create a short array to store the recorded audio.
int musicLength = (int)(file.length()/2);
short[] music = new short[musicLength];
try {
// Create a DataInputStream to read the audio data back from the saved file.
InputStream is = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(is);
DataInputStream dis = new DataInputStream(bis);
// Read the file into the music array.
int i = 0;
while (dis.available() > 0) {
music[i] = dis.readShort();
i++;
}
// Close the input streams.
dis.close();
// Create a new AudioTrack object using the same parameters as the AudioRecord
// object used to create the file.
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
8000,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT,
musicLength,
AudioTrack.MODE_STREAM);
// Start playback
audioTrack.play();
// Write the music buffer to the AudioTrack object
audioTrack.write(music, 0, musicLength);