/*
* Writes WAV header into new file.
*/
private void writeWavHeader() {
try {
randomAccessWriter = new RandomAccessFile(filePath, "rw");
randomAccessWriter.setLength(0);
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((short) 1)); // Number of channels, 1 for mono, 2 for stereo
randomAccessWriter.writeInt(Integer.reverseBytes(RECORDER_SAMPLE_RATE)); // Sample rate
randomAccessWriter.writeInt(
Integer.reverseBytes(
RECORDER_SAMPLE_RATE
* 16
* 1
/ 8)); // Byte rate, SampleRate*NumberOfChannels*BitsPerSample/8
randomAccessWriter.writeShort(
Short.reverseBytes(
(short) (1 * 16 / 8))); // Block align, NumberOfChannels*BitsPerSample/8
randomAccessWriter.writeShort(Short.reverseBytes((short) 16)); // Bits per sample
randomAccessWriter.writeBytes("data");
randomAccessWriter.writeInt(0); // Data chunk size not known yet, write 0
} catch (Exception e) {
Log.e("Microphone", "Error writing WAV header.");
}
}
/**
* 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;
}
}
/**
* Writes the Item UM to the Items Random Access File
*
* @param file - the Items Random Access File
*/
private void writeUMToFile(RandomAccessFile file) {
try {
file.writeShort(getUm().getCode());
} catch (Exception e) {
}
}
/**
* Writes the Item's creation date to the Items Random Access File
*
* @param file - the Item's Random Access File
*/
private void writeCreationDate(RandomAccessFile file) {
try {
file.writeShort(getCreationDate().get(Calendar.YEAR));
file.writeByte(getCreationDate().get(Calendar.MONTH));
file.writeByte(getCreationDate().get(Calendar.DAY_OF_MONTH));
} catch (Exception e) {
}
}
/** Write NumBytes data. */
public int Write(short Data, int NumBytes) {
short theData = (short) (((Data >>> 8) & 0x00FF) | ((Data << 8) & 0xFF00));
if (fmode != RFM_WRITE) {
return DDC_INVALID_CALL;
}
try {
file.writeShort(theData);
fmode = RFM_WRITE;
} catch (IOException ioe) {
return DDC_FILE_ERROR;
}
riff_header.ckSize += NumBytes;
return DDC_SUCCESS;
}
/**
* This writes the binary short to the file. Later, use readBinaryShort to read the value from the
* file.
*/
public void writeBinaryShort(int col, int row, short s) throws IOException {
raf.seek(row * nBytesPerRow + columnStartAt[col]);
raf.writeShort(s);
}
/**
* 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 ((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 * nChannels * mBitsPersample / 8)); // Byte rate,
// SampleRate*NumberOfChannels*mBitsPersample/8
randomAccessWriter.writeShort(
Short.reverseBytes((short) (nChannels * mBitsPersample / 8))); // Block align,
// NumberOfChannels*mBitsPersample/8
randomAccessWriter.writeShort(Short.reverseBytes(mBitsPersample)); // Bits per sample
randomAccessWriter.writeBytes("data");
randomAccessWriter.writeInt(0); // Data chunk size not known
// yet, write 0
buffer = new byte[mPeriodInFrames * mBitsPersample / 8 * nChannels];
state = State.READY;
} else {
Log.e(
WavAudioRecorder.class.getName(),
"prepare() method called on uninitialized recorder");
state = State.ERROR;
}
} else {
Log.e(WavAudioRecorder.class.getName(), "prepare() method called on illegal state");
release();
state = State.ERROR;
}
} catch (Exception e) {
if (e.getMessage() != null) {
Log.e(WavAudioRecorder.class.getName(), e.getMessage());
} else {
Log.e(WavAudioRecorder.class.getName(), "Unknown error occured in prepare()");
}
state = State.ERROR;
}
}
/* @see java.io.DataOutput.writeShort(int) */
public void writeShort(int v) throws IOException {
raf.writeShort(v);
}