Record wav format audio in android
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import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.os.Environment; 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); } }</code> //Call Above class like |
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WavRecorder wavRecorder = new WavRecorder("path_to_file.wav"); wavRecorder.startRecording(); //do something else... wavRecorder.stopRecording(); |