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使用 AudioRecord API 的 android 录音机

转载 作者:行者123 更新时间:2023-11-29 00:52:13 27 4
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我是安卓新手。我想使用 AndroidRecord API 构建一个录音机 android 来获取 .wav 文件,因为要进一步处理声音格式必须是 .wav。经过搜索和一些试验,我无法得到我想要的。任何帮助将不胜感激。

最佳答案

Andoid AudioRecordMediaRecorder 库不支持wav格式。但这是一个解决方案。将此类复制到您的代码中:

public class WavRecorder {
private static final int RECORDER_BPP = 16;
private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";
private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
private static final int RECORDER_SAMPLERATE = 44100;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
short[] audioData;

private AudioRecord recorder = null;
private int bufferSize = 0;
private Thread recordingThread = null;
private boolean isRecording = false;
int[] bufferData;
int bytesRecorded;

private String output;

public WavRecorder(String path) {
bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING) * 3;

audioData = new short[bufferSize]; // short array that pcm data is put
// into.
output = path;

}

private String getFilename() {
return (output);
}

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);
}

public void startRecording() {

recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLERATE, RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING, bufferSize);
int i = recorder.getState();
if (i == 1)
recorder.startRecording();

isRecording = true;

recordingThread = new Thread(new Runnable() {
@Override
public void run() {
writeAudioDataToFile();
}
}, "AudioRecorder Thread");

recordingThread.start();
}

private void writeAudioDataToFile() {
byte data[] = new byte[bufferSize];
String filename = getTempFilename();
FileOutputStream os = null;

try {
os = new FileOutputStream(filename);
} catch (FileNotFoundException e) {
e.printStackTrace();
}

int read = 0;
if (null != os) {
while (isRecording) {
read = recorder.read(data, 0, bufferSize);
if (read > 0) {
}

if (AudioRecord.ERROR_INVALID_OPERATION != read) {
try {
os.write(data);
} catch (IOException e) {
e.printStackTrace();
}
}
}

try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

public void stopRecording() {
if (null != recorder) {
isRecording = false;

int i = recorder.getState();
if (i == 1)
recorder.stop();
recorder.release();

recorder = null;
recordingThread = null;
}

copyWaveFile(getTempFilename(), getFilename());
deleteTempFile();
}

private void deleteTempFile() {
File file = new File(getTempFilename());
file.delete();
}

private void copyWaveFile(String inFilename, String outFilename) {
FileInputStream in = null;
FileOutputStream out = null;
long totalAudioLen = 0;
long totalDataLen = totalAudioLen + 36;
long longSampleRate = RECORDER_SAMPLERATE;
int channels = ((RECORDER_CHANNELS == AudioFormat.CHANNEL_IN_MONO) ? 1
: 2);
long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8;

byte[] data = new byte[bufferSize];

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 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) (((RECORDER_CHANNELS == AudioFormat.CHANNEL_IN_MONO) ? 1
: 2) * 16 / 8); // block align
header[33] = 0;
header[34] = RECORDER_BPP; // 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);
}
}

然后像这样使用它:

WavRecorder wavRecorder = new WavRecorder("path_to_file.wav");
wavRecorder.startRecording();
//do something else...
wavRecorder.stopRecording();

此代码复制自 this blog发布。

关于使用 AudioRecord API 的 android 录音机,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58284554/

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