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Java Sound : audio inputstream from pcm amplitude array
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转载自：http://ganeshtiwaridotcomdotnp.blogspot.com/2011/12/java-sound-making-audio-input-stream.html
In this post, i am going to show the code for creating the AudioInputStream from an PCM - amplitude array.
It basically converts the int [] array to byte array according to AudioFormat.
The code for the reverse operation (extract amplitude array from recorded wave file or AudioStream )is in my
earlier post : http://ganeshtiwaridotcomdotnp.blogspot.com/2011/12/java-extract-amplitude-array-from.html
The code for converting PCM amplitude array to AudioStream is follows :
public static AudioInputStream getAudioStreamFromPCMArray(int[] audioDataIntArr, AudioFormat format) {
byte[] data = null;
int nlengthInSamples = audioDataIntArr.length * 2;
if (format.getSampleSizeInBits() == 16) {
// FIXME: debug at full length, signed/unsigned problem
data = new byte[nlengthInSamples];
if (format.isBigEndian()) {
for (int i = 0; i < audioDataIntArr.length; i++) {
int temp = Math.abs((short) (audioDataIntArr[i] * 255));
data[2 * i + 1] = (byte) temp;
data[2 * i + 0] = (byte) (temp >> 8);
}
} else {
for (int i = 0; i < audioDataIntArr.length; i++) {
int temp = Math.abs((short) (audioDataIntArr[i] * 255));
data[2 * i + 0] = (byte) temp;
data[2 * i + 1] = (byte) (temp >> 8);
}
}
} else if (format.getSampleSizeInBits() == 8) {
nlengthInSamples = audioDataIntArr.length;
data = new byte[nlengthInSamples];
if (format.getEncoding().toString().startsWith("PCM_SIGN")) {
// PCM_SIGNED
for (int i = 0; i < nlengthInSamples; i++) {
data[i] = (byte) audioDataIntArr[i];
}
} else {
// PCM_UNSIGNED
for (int i = 0; i < nlengthInSamples; i++) {
data[i] = (byte) (audioDataIntArr[i] + 128);
}
}
}// end of if..else
try {
ByteArrayInputStream bais = new ByteArrayInputStream(data);
AudioInputStream ais = new AudioInputStream(bais, format, audioDataIntArr.length);
return ais;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
//## Required Testing -- Comments are much welcomed ...... Thanks
