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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drrickorang.loopback;
import android.os.Environment;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.File;
import android.net.Uri;
import android.content.Context;
import java.util.Arrays;
/**
*
*/
public class AudioFileOutput {
private static final String LOGTAG = "LoopbackWrite";
private Uri mUri;
private Context mContext;
private FileOutputStream mOutputStream;
private FileDescriptor mFileDescriptor;
private int mSamplingRate = 48000;
public AudioFileOutput(Context context, Uri uri, int samplingRate) {
mContext = context;
mUri = uri;
mSamplingRate = samplingRate;
}
public boolean writeData(double [] data) {
boolean status = false;
ParcelFileDescriptor parcelFileDescriptor = null;
try {
parcelFileDescriptor =
mContext.getContentResolver().openFileDescriptor(mUri, "w");
mFileDescriptor = parcelFileDescriptor.getFileDescriptor();
mOutputStream = new FileOutputStream(mFileDescriptor);
log("Done creating output stream");
int sampleCount = data.length;
writeHeader(sampleCount);
writeDataBufer(data);
mOutputStream.close();
status = true;
parcelFileDescriptor.close();
} catch (Exception e) {
mOutputStream = null;
log("Failed to open wavefile" +e);
} finally {
try {
if (parcelFileDescriptor != null) {
parcelFileDescriptor.close();
}
} catch (Exception e) {
e.printStackTrace();
log("Error closing ParcelFile Descriptor");
}
}
return status;
}
private void writeHeader(int samples) {
if (mOutputStream != null) {
try {
int channels = 1;
int blockAlignment = 2;
int bitsPerSample = 16;
byte[] chunkSize = new byte[4];
byte[] dataSize = new byte[4];
int tempChunkSize = samples*2 + 36;
chunkSize[3] = (byte) (tempChunkSize >> 24);
chunkSize[2] = (byte) (tempChunkSize >> 16);
chunkSize[1] = (byte) (tempChunkSize >> 8);
chunkSize[0] = (byte) tempChunkSize;
int tempDataSize = samples*2;
dataSize[3] = (byte) (tempDataSize >> 24);
dataSize[2] = (byte) (tempDataSize >> 16);
dataSize[1] = (byte) (tempDataSize >> 8);
dataSize[0] = (byte) tempDataSize;
byte[] header = new byte[] {
'R', 'I', 'F', 'F',
chunkSize[0], chunkSize[1], chunkSize[2], chunkSize[3],
'W', 'A', 'V', 'E',
'f', 'm', 't', ' ',
16, 0, 0, 0,
1, 0, // PCM
(byte) channels, 0, // number of channels
(byte) mSamplingRate, (byte) (mSamplingRate >> 8), 0, 0, // sample rate
0, 0, 0, 0, // byte rate
(byte) (channels * blockAlignment),
0, // block alignment
(byte) bitsPerSample,
0, // bits per sample
'd', 'a', 't', 'a',
dataSize[0], dataSize[1], dataSize[2], dataSize[3],
};
mOutputStream.write(header);
log("Done writing header");
} catch (IOException e) {
Log.e(LOGTAG, "Error writing header "+e);
}
}
}
private void writeDataBufer(double [] data) {
if (mOutputStream != null) {
try {
int sampleCount = data.length;
int bufferSize = 1024; //blocks of 1024 samples
byte [] buffer = new byte[bufferSize*2];
double maxval = Math.pow(2, 15);
for (int ii=0; ii<sampleCount; ii +=bufferSize) {
//clear buffer
Arrays.fill( buffer, (byte)0);
int bytesUsed =0;
for (int jj=0; jj<bufferSize; jj++) {
int index = ii+jj;
if (index>=sampleCount)
break;
int value = (int) Math.round( data[index]*maxval );
byte ba =(byte)( 0xFF &(value >>8));
byte bb = (byte) ( 0xFF &(value));
buffer[jj*2+1] = ba;
buffer[jj*2] = bb;
bytesUsed +=2;
}
mOutputStream.write(buffer, 0, bytesUsed);
// log("writing samples:"+ii+"/"+ sampleCount);
}
log("Done writing data");
} catch (IOException e) {
Log.e(LOGTAG, "Error writing data "+e);
}
}
}
private static void log(String msg) {
Log.v(LOGTAG, msg);
}
}
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