使用ChannelAPI的安卓穿戴录音设备
使用ChannelAPI的安卓穿戴录音设备
提问于 2015-08-05 16:33:45
我正在尝试为Android磨损开发一个音频记录应用程序。现在，我能够捕获手表上的音频，流到电话中，并将其保存在文件中。然而，音频文件呈现空白或裁剪部分。
我发现这个问题与我的问题link1，link2有关，但他们帮不了我。
这是我的代码：
首先，在手表一侧，我使用channelAPI创建频道，并成功地将手表上捕捉到的音频发送到智能手机。
//here are the variables values that I used
//44100Hz is currently the only rate that is guaranteed to work on all devices
//but other rates such as 22050, 16000, and 11025 may work on some devices.
private static final int RECORDER_SAMPLE_RATE = 44100;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
int BufferElements2Rec = 1024;
int BytesPerElement = 2;
//start the process of recording audio
private void startRecording() {
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLE_RATE, RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable() {
public void run() {
writeAudioDataToPhone();
}
}, "AudioRecorder Thread");
recordingThread.start();
}
private void writeAudioDataToPhone(){
short sData[] = new short[BufferElements2Rec];
ChannelApi.OpenChannelResult result = Wearable.ChannelApi.openChannel(googleClient, nodeId, "/mypath").await();
channel = result.getChannel();
Channel.GetOutputStreamResult getOutputStreamResult = channel.getOutputStream(googleClient).await();
OutputStream outputStream = getOutputStreamResult.getOutputStream();
while (isRecording) {
// gets the voice output from microphone to byte format
recorder.read(sData, 0, BufferElements2Rec);
try {
byte bData[] = short2byte(sData);
outputStream.write(bData);
} catch (IOException e) {
e.printStackTrace();
}
}
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}然后，在智能手机端，我接收来自频道的音频数据，并将其写入PCM文件。
public void onChannelOpened(Channel channel) {
if (channel.getPath().equals("/mypath")) {
Channel.GetInputStreamResult getInputStreamResult = channel.getInputStream(mGoogleApiClient).await();
inputStream = getInputStreamResult.getInputStream();
writePCMToFile(inputStream);
MainActivity.this.runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "Audio file received!", Toast.LENGTH_SHORT).show();
}
});
}
}
public void writePCMToFile(InputStream inputStream) {
OutputStream outputStream = null;
try {
// write the inputStream to a FileOutputStream
outputStream = new FileOutputStream(new File("/sdcard/wearRecord.pcm"));
int read = 0;
byte[] bytes = new byte[1024];
while ((read = inputStream.read(bytes)) != -1) {
outputStream.write(bytes, 0, read);
}
System.out.println("Done writing PCM to file!");
} catch (Exception e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if (outputStream != null) {
try {
// outputStream.flush();
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}我做错了什么，或者你有什么建议在智能手机上实现完美的无障碍音频文件？提前谢谢。
回答 1
Stack Overflow用户
发布于 2015-08-07 17:39:48
在您的代码中，我注意到您正在将所有内容读取到short[]数组中，然后将其转换为byte[]数组以供Channel发送。您的代码还通过循环的每一次迭代创建一个新的byte[]数组，这将为垃圾收集器创建大量的工作。通常，您希望避免循环内部的分配。
我将在顶部分配一个byte[]数组，并让AudioRecord类将其直接存储到byte[]数组中(只需确保分配的字节数是简短的字节数的两倍)，代码如下：
mAudioTemp = new byte[bufferSize];
int result;
while ((result = mAudioRecord.read(mAudioTemp, 0, mAudioTemp.length)) > 0) {
try {
mAudioStream.write(mAudioTemp, 0, result);
} catch (IOException e) {
Log.e(Const.TAG, "Write to audio channel failed: " + e);
}
}我还用1秒的音频缓冲区测试了这一点，使用了类似这样的代码，它工作得很好。在出现问题之前，我不确定最小缓冲区大小是多少：
int bufferSize = Math.max(
AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT),
44100 * 2);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/31838129
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