问题
I must concat 2 or more audio (wav or mp3) files and get one audio file. How can I do that in android? Thanks in advance.
回答1:
The below code section will work as how many selections have been made.Selection means how much files are selected. Put your two wav files in /sdcard0/SSoftAudioFiles/ as 1.wav and 2.wav. And Just execute this method.
public void SSoftAudCombine()
{
try {
String[] selection=new String[2];
selection[0]="1.wav";
selection[1]="2.wav";
DataOutputStream amplifyOutputStream = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(Environment.getExternalStorageDirectory() + "/SSoftAudioFiles/" + year +"-"+ month +"-"+ date +"-"+ hour+"-" + min +"-"+ sec+"ME.wav")));
DataInputStream[] mergeFilesStream = new DataInputStream[selection.length];
long[] sizes=new long[selection.length];
for(int i=0; i<selection.length; i++) {
File file = new File(Environment.getExternalStorageDirectory() + "/SSoftAudioFiles/" +selection[i]);
sizes[i] = (file.length()-44)/2;
}
for(int i =0; i<selection.length; i++) {
mergeFilesStream[i] =new DataInputStream(new BufferedInputStream(new FileInputStream(Environment.getExternalStorageDirectory() + "/SSoftAudioFiles/" +selection[i])));
if(i == selection.length-1) {
mergeFilesStream[i].skip(24);
byte[] sampleRt = new byte[4];
mergeFilesStream[i].read(sampleRt);
ByteBuffer bbInt = ByteBuffer.wrap(sampleRt).order(ByteOrder.LITTLE_ENDIAN);
RECORDER_SAMPLERATE = bbInt.getInt();
mergeFilesStream[i].skip(16);
}
else {
mergeFilesStream[i].skip(44);
}
}
for(int b=0; b<selection.length; b++) {
for(int i=0; i<(int)sizes[b]; i++) {
byte[] dataBytes = new byte[2];
try {
dataBytes[0] = mergeFilesStream[b].readByte();
dataBytes[1] = mergeFilesStream[b].readByte();
}
catch (EOFException e) {
amplifyOutputStream.close();
}
short dataInShort = ByteBuffer.wrap(dataBytes).order(ByteOrder.LITTLE_ENDIAN).getShort();
float dataInFloat= (float) dataInShort/37268.0f;
short outputSample = (short)(dataInFloat * 37268.0f);
byte[] dataFin = new byte[2];
dataFin[0] = (byte) (outputSample & 0xff);
dataFin[1] = (byte)((outputSample >> 8) & 0xff);
amplifyOutputStream.write(dataFin, 0 , 2);
}
}
amplifyOutputStream.close();
for(int i=0; i<selection.length; i++) {
mergeFilesStream[i].close();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
long size =0;
try {
FileInputStream fileSize = new FileInputStream(Environment.getExternalStorageDirectory() + "/SSoftAudioFiles/"+year +"-"+ month +"-"+ date +"-"+ hour+"-" + min +"-"+ sec+"ME.wav");
size = fileSize.getChannel().size();
fileSize.close();
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
final int RECORDER_BPP = 16;
long datasize=size+36;
long byteRate = (RECORDER_BPP * RECORDER_SAMPLERATE)/8;
long longSampleRate = RECORDER_SAMPLERATE;
byte[] header = new byte[44];
header[0] = 'R'; // RIFF/WAVE header
header[1] = 'I';
header[2] = 'F';
header[3] = 'F';
header[4] = (byte) (datasize & 0xff);
header[5] = (byte) ((datasize >> 8) & 0xff);
header[6] = (byte) ((datasize >> 16) & 0xff);
header[7] = (byte) ((datasize >> 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) 1;
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_BPP) / 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) (size & 0xff);
header[41] = (byte) ((size >> 8) & 0xff);
header[42] = (byte) ((size >> 16) & 0xff);
header[43] = (byte) ((size >> 24) & 0xff);
// out.write(header, 0, 44);
try {
RandomAccessFile rFile = new RandomAccessFile(Environment.getExternalStorageDirectory() + "/SSoftAudioFiles/" +year +"-"+ month +"-"+ date +"-"+ hour+"-" + min +"-"+ sec+ "ME.wav", "rw");
rFile.seek(0);
rFile.write(header);
rFile.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
It will concate your audio file and save a combined file in /sdcard0/SSoftAudioFiles/...ME.wav.
回答2:
The below code will surely help you to concatinating two audio files.
try {
FileInputStream fis1 = new FileInputStream("/sdcard/MJdangerous.wav");
FileInputStream fis2 = new FileInputStream("/sdcard/MJBad.wav");
SequenceInputStream sis = new SequenceInputStream(fis1,fis2);
FileOutputStream fos = new FileOutputStream(new File("/sdcard/MJdangerousMJBad.wav"));
int temp;
try {
while ((temp = sis.read())!= -1){
fos.write(temp);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
来源：https://stackoverflow.com/questions/23112372/android-concat-2-audio-wav-or-mp3-files