Android使用录音(WAV格式)
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一:使用到的工具类
package com.macro.record.utils;import java.io.File;import java.io.IOException;import java.io.RandomAccessFile;import android.media.AudioFormat;import android.media.AudioRecord;import android.media.MediaRecorder;import android.media.MediaRecorder.AudioSource;import android.util.Log;public class ExtAudioRecorder { private final static int[] sampleRates = { 44100, 22050, 11025, 8000 }; private static ExtAudioRecorder result = null; public static ExtAudioRecorder getInstanse(Boolean recordingCompressed) { if (recordingCompressed) { result = new ExtAudioRecorder(false, AudioSource.MIC, sampleRates[3], AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); } else { int i = 3; do { result = new ExtAudioRecorder(true, AudioSource.MIC, sampleRates[i], AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); } while ((++i < sampleRates.length) & !(result.getState() == ExtAudioRecorder.State.INITIALIZING)); } return result; } /** * INITIALIZING : recorder is initializing; READY : recorder has been * initialized, recorder not yet started RECORDING : recording ERROR : * reconstruction needed STOPPED: reset needed */ public enum State { INITIALIZING, READY, RECORDING, ERROR, STOPPED }; public static final boolean RECORDING_UNCOMPRESSED = true; public static final boolean RECORDING_COMPRESSED = false; // The interval in which the recorded samples are output to the file // Used only in uncompressed mode private static final int TIMER_INTERVAL = 120; // Toggles uncompressed recording on/off; RECORDING_UNCOMPRESSED / // RECORDING_COMPRESSED private boolean rUncompressed; // Recorder used for uncompressed recording private AudioRecord audioRecorder = null; // Recorder used for compressed recording private MediaRecorder mediaRecorder = null; // Stores current amplitude (only in uncompressed mode) private int cAmplitude = 0; // Output file path private String filePath = null; // Recorder state; see State private State state; // File writer (only in uncompressed mode) private RandomAccessFile randomAccessWriter; // Number of channels, sample rate, sample size(size in bits), buffer size, // audio source, sample size(see AudioFormat) private short nChannels; private int sRate; private short bSamples; private int bufferSize; private int aSource; private int aFormat; // Number of frames written to file on each output(only in uncompressed // mode) private int framePeriod; // Buffer for output(only in uncompressed mode) private byte[] buffer; // Number of bytes written to file after header(only in uncompressed mode) // after stop() is called, this size is written to the header/data chunk in // the wave file private int payloadSize; /** * * Returns the state of the recorder in a RehearsalAudioRecord.State typed * object. Useful, as no exceptions are thrown. * * @return recorder state */ public State getState() { return state; } /* * * Method used for recording. */ private AudioRecord.OnRecordPositionUpdateListener updateListener = new AudioRecord.OnRecordPositionUpdateListener() { public void onPeriodicNotification(AudioRecord recorder) { audioRecorder.read(buffer, 0, buffer.length); // Fill buffer try { randomAccessWriter.write(buffer); // Write buffer to file payloadSize += buffer.length; if (bSamples == 16) { for (int i = 0; i cAmplitude) { // Check amplitude cAmplitude = curSample; } } } else { // 8bit sample size for (int i = 0; i cAmplitude) { // Check amplitude cAmplitude = buffer[i]; } } } } catch (IOException e) { Log.e(ExtAudioRecorder.class.getName(), "Error occured in updateListener, recording is aborted"); // stop(); } } public void onMarkerReached(AudioRecord recorder) { // NOT USED } }; /** * * * Default constructor * * Instantiates a new recorder, in case of compressed recording the * parameters can be left as 0. In case of errors, no exception is thrown, * but the state is set to ERROR * */ public ExtAudioRecorder(boolean uncompressed, int audioSource, int sampleRate, int channelConfig, int audioFormat) { try { rUncompressed = uncompressed; if (rUncompressed) { // RECORDING_UNCOMPRESSED if (audioFormat == AudioFormat.ENCODING_PCM_16BIT) { bSamples = 16; } else { bSamples = 8; } if (channelConfig == AudioFormat.CHANNEL_CONFIGURATION_MONO) { nChannels = 1; } else { nChannels = 2; } aSource = audioSource; sRate = sampleRate; aFormat = audioFormat; framePeriod = sampleRate * TIMER_INTERVAL / 1000; bufferSize = framePeriod * 2 * bSamples * nChannels / 8; if (bufferSize < AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat)) { // Check to make sure // buffer size is not // smaller than the // smallest allowed one bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat); // Set frame period and timer interval accordingly framePeriod = bufferSize / (2 * bSamples * nChannels / 8); Log.w(ExtAudioRecorder.class.getName(), "Increasing buffer size to " + Integer.toString(bufferSize)); } audioRecorder = new AudioRecord(audioSource, sampleRate, channelConfig, audioFormat, bufferSize); if (audioRecorder.getState() != AudioRecord.STATE_INITIALIZED) throw new Exception("AudioRecord initialization failed"); audioRecorder.setRecordPositionUpdateListener(updateListener); audioRecorder.setPositionNotificationPeriod(framePeriod); } else { // RECORDING_COMPRESSED mediaRecorder = new MediaRecorder(); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder .setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mediaRecorder .setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); } cAmplitude = 0; filePath = null; state = State.INITIALIZING; } catch (Exception e) { if (e.getMessage() != null) { Log.e(ExtAudioRecorder.class.getName(), e.getMessage()); } else { Log.e(ExtAudioRecorder.class.getName(), "Unknown error occured while initializing recording"); } state = State.ERROR; } } /** * Sets output file path, call directly after construction/reset. * * @param output * file path * */ public void setOutputFile(String argPath) { try { if (state == State.INITIALIZING) { filePath = argPath; if (!rUncompressed) { mediaRecorder.setOutputFile(filePath); } } } catch (Exception e) { if (e.getMessage() != null) { Log.e(ExtAudioRecorder.class.getName(), e.getMessage()); } else { Log.e(ExtAudioRecorder.class.getName(), "Unknown error occured while setting output path"); } state = State.ERROR; } } /** * * Returns the largest amplitude sampled since the last call to this method. * * @return returns the largest amplitude since the last call, or 0 when not * in recording state. * */ public int getMaxAmplitude() { if (state == State.RECORDING) { if (rUncompressed) { int result = cAmplitude; cAmplitude = 0; return result; } else { try { return mediaRecorder.getMaxAmplitude(); } catch (IllegalStateException e) { return 0; } } } else { return 0; } } /** * * Prepares the recorder for recording, in case the recorder is not in the * INITIALIZING state and the file path was not set the recorder is set to * the ERROR state, which makes a reconstruction necessary. In case * uncompressed recording is toggled, the header of the wave file is * written. In case of an exception, the state is changed to ERROR * */ public void prepare() { try { if (state == State.INITIALIZING) { if (rUncompressed) { if ((audioRecorder.getState() == AudioRecord.STATE_INITIALIZED) & (filePath != null)) { // write file header randomAccessWriter = new RandomAccessFile(filePath, "rw"); randomAccessWriter.setLength(0); // Set file length to // 0, to prevent // unexpected // behavior in case // the file already // existed randomAccessWriter.writeBytes("RIFF"); randomAccessWriter.writeInt(0); // Final file size not // known yet, write 0 randomAccessWriter.writeBytes("WAVE"); randomAccessWriter.writeBytes("fmt "); randomAccessWriter.writeInt(Integer.reverseBytes(16)); // Sub-chunk // size, // 16 // for // PCM randomAccessWriter.writeShort(Short .reverseBytes((short) 1)); // AudioFormat, 1 for // PCM randomAccessWriter.writeShort(Short .reverseBytes(nChannels));// Number of channels, // 1 for mono, 2 for // stereo randomAccessWriter .writeInt(Integer.reverseBytes(sRate)); // Sample // rate randomAccessWriter.writeInt(Integer.reverseBytes(sRate * bSamples * nChannels / 8)); // Byte rate, // SampleRate*NumberOfChannels*BitsPerSample/8 randomAccessWriter .writeShort(Short .reverseBytes((short) (nChannels * bSamples / 8))); // Block // align, // NumberOfChannels*BitsPerSample/8 randomAccessWriter.writeShort(Short .reverseBytes(bSamples)); // Bits per sample randomAccessWriter.writeBytes("data"); randomAccessWriter.writeInt(0); // Data chunk size not // known yet, write 0 buffer = new byte[framePeriod * bSamples / 8 * nChannels]; state = State.READY; } else { Log.e(ExtAudioRecorder.class.getName(), "prepare() method called on uninitialized recorder"); state = State.ERROR; } } else { mediaRecorder.prepare(); state = State.READY; } } else { Log.e(ExtAudioRecorder.class.getName(), "prepare() method called on illegal state"); release(); state = State.ERROR; } } catch (Exception e) { if (e.getMessage() != null) { Log.e(ExtAudioRecorder.class.getName(), e.getMessage()); } else { Log.e(ExtAudioRecorder.class.getName(), "Unknown error occured in prepare()"); } state = State.ERROR; } } /** * * * Releases the resources associated with this class, and removes the * unnecessary files, when necessary * */ public void release() { if (state == State.RECORDING) { stop(); } else { if ((state == State.READY) & (rUncompressed)) { try { randomAccessWriter.close(); // Remove prepared file } catch (IOException e) { Log.e(ExtAudioRecorder.class.getName(), "I/O exception occured while closing output file"); } (new File(filePath)).delete(); } } if (rUncompressed) { if (audioRecorder != null) { audioRecorder.release(); } } else { if (mediaRecorder != null) { mediaRecorder.release(); } } } /** * * * Resets the recorder to the INITIALIZING state, as if it was just created. * In case the class was in RECORDING state, the recording is stopped. In * case of exceptions the class is set to the ERROR state. * */ public void reset() { try { if (state != State.ERROR) { release(); filePath = null; // Reset file path cAmplitude = 0; // Reset amplitude if (rUncompressed) { audioRecorder = new AudioRecord(aSource, sRate, nChannels + 1, aFormat, bufferSize); } else { mediaRecorder = new MediaRecorder(); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder .setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mediaRecorder .setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); } state = State.INITIALIZING; } } catch (Exception e) { Log.e(ExtAudioRecorder.class.getName(), e.getMessage()); state = State.ERROR; } } /** * * * Starts the recording, and sets the state to RECORDING. Call after * prepare(). * */ public void start() { if (state == State.READY) { if (rUncompressed) { payloadSize = 0; audioRecorder.startRecording(); audioRecorder.read(buffer, 0, buffer.length); } else { mediaRecorder.start(); } state = State.RECORDING; } else { Log.e(ExtAudioRecorder.class.getName(), "start() called on illegal state"); state = State.ERROR; } } /** * * * Stops the recording, and sets the state to STOPPED. In case of further * usage, a reset is needed. Also finalizes the wave file in case of * uncompressed recording. * */ public void stop() { if (state == State.RECORDING) { if (rUncompressed) { audioRecorder.stop(); try { randomAccessWriter.seek(4); // Write size to RIFF header randomAccessWriter.writeInt(Integer .reverseBytes(36 + payloadSize)); randomAccessWriter.seek(40); // Write size to Subchunk2Size // field randomAccessWriter.writeInt(Integer .reverseBytes(payloadSize)); randomAccessWriter.close(); } catch (IOException e) { Log.e(ExtAudioRecorder.class.getName(), "I/O exception occured while closing output file"); state = State.ERROR; } } else { mediaRecorder.stop(); } state = State.STOPPED; } else { Log.e(ExtAudioRecorder.class.getName(), "stop() called on illegal state"); state = State.ERROR; } } /* * * Converts a byte[2] to a short, in LITTLE_ENDIAN format */ private short getShort(byte argB1, byte argB2) { return (short) (argB1 | (argB2 <录音完成");recorder.stopRecord();} 0 0
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