AudioRecord錄製音頻文件並存儲本地

浮躁期，太浮躁了，不能專心學習，自律，成功的人一定是自律的人。

AudioRecord錄音，直接上代碼：

        private int mRecordBufferSize = 0;
	private AudioRecord mRecordInstance = null;
	private ByteArrayOutputStream saveVoiceByte;
	private boolean isRecord = false;
	private static int sampleRateInHz = 16000;//採樣率
	// AudioName裸音頻數據文件
	private static final String AudioName = "/sdcard/raw.raw";
	// NewAudioName可播放的音頻文件
	private static final String NewAudioName = "/sdcard/new.wav";

這是初始化的一些數據。

               isRecord = true;
	 new Thread(new AudioRecordThread()).start();

這是開始錄音的點擊事件，點擊後開啓一個線程，錄音開識。

	if (mRecordInstance != null) {
			mRecordInstance.stop();
			mRecordInstance.release();
			mRecordInstance = null;
			isRecord = false;
		}

這是結束錄音的事件，主要是釋放信息。

接下來看一下錄音線程中具體做了什麼？

	</span>class AudioRecordThread implements Runnable {
		@Override
		public void run() {
			try {
				StartRecord();// 開始錄音
				copyWaveFile(AudioName, NewAudioName);// 得到音頻文件
			} catch (Exception e) {
				// TODO: handle exception
			}

		}
	}

實現了兩個方法：StartRecord和copyWaveFile,前者實現錄音，後者作用是保存到本地

	public void StartRecord() {
		// TODO Auto-generated method stub
		int channelConfiguration = AudioFormat.CHANNEL_IN_MONO;
		int audioEncodingBits = AudioFormat.ENCODING_PCM_16BIT;
		mRecordBufferSize = AudioRecord.getMinBufferSize(16000, channelConfiguration, audioEncodingBits);
		mRecordInstance = new AudioRecord(MediaRecorder.AudioSource.MIC, 16000, channelConfiguration, audioEncodingBits,
				mRecordBufferSize);
		mRecordInstance.getChannelCount();
		FileOutputStream fos = null;
		File file = new File(AudioName);
		if (file.exists()) {
			file.delete();
		}
		try {
			fos = new FileOutputStream(file);
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}

		if (mRecordInstance != null && mRecordInstance.getState() == AudioRecord.STATE_INITIALIZED) {
			try {
				mRecordInstance.startRecording();
			} catch (IllegalStateException e) {
				e.printStackTrace();
			}
		}
		byte[] audiodata = new byte[mRecordBufferSize];
		int readsize = 0;
		try {
			saveVoiceByte = new ByteArrayOutputStream();
		} catch (Exception e) {
			e.printStackTrace();
		}
		while (isRecord == true) {
			readsize = mRecordInstance.read(audiodata, 0, mRecordBufferSize);// ??
			if (AudioRecord.ERROR_INVALID_OPERATION != readsize) {
				try {
					saveVoiceByte.write(audiodata, 0, readsize);// saveVoiceByte得到的字節流
					fos.write(audiodata, 0, readsize);// 寫入文件
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
		try {
			saveVoiceByte.close();//
			fos.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

主要是實現錄製視頻，然後將原始數據保存到本地。

private void copyWaveFile(String inFilename, String outFilename) {
		FileInputStream in = null;
		FileOutputStream out = null;
		long totalAudioLen = 0;
		long totalDataLen = totalAudioLen + 36;
		long longSampleRate = sampleRateInHz;
		int channels = 1;
		long byteRate = 16 * sampleRateInHz * channels / 8;
		byte[] data = new byte[mRecordBufferSize];
		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();
		}
	}

	/**
	 * 添加頭信息，否則無法播放。
	 */
	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';
		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';
		header[13] = 'm';
		header[14] = 't';
		header[15] = ' ';
		header[16] = 16;
		header[17] = 0;
		header[18] = 0;
		header[19] = 0;
		header[20] = 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);
	}

這個方法主要是爲得到的原生視頻添加頭文件，否則無法播放。
Demo下載鏈接：點擊打開鏈接