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August 6, 2020 06:25
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import fr.delthas.javamp3.Sound; | |
import javax.imageio.ImageIO; | |
import javax.sound.sampled.*; | |
import java.awt.image.BufferedImage; | |
import java.io.BufferedInputStream; | |
import java.io.ByteArrayInputStream; | |
import java.io.File; | |
import java.io.IOException; | |
import java.nio.file.Files; | |
import java.nio.file.Paths; | |
// https://github.com/delthas/JavaMP3 | |
// http://soundfile.sapp.org/doc/WaveFormat | |
public class Main { | |
public static void main(String[] args) throws IOException { | |
try (Sound sound = new Sound(new BufferedInputStream(Main.class.getResourceAsStream("mp3-2.mp3")))) { | |
AudioFormat audioFormat = sound.getAudioFormat(); | |
byte[] pcm = sound.readAllBytes(); | |
//pcm = inverse(pcm); | |
visualizePcm(pcm); | |
System.out.println(sound.getAudioFormat()); | |
byte[] wavFile = pcmToWav(pcm, | |
(int) audioFormat.getSampleRate(), | |
audioFormat.getChannels(), | |
audioFormat.getSampleSizeInBits()); | |
Files.write(Paths.get("pcm.pcm"), pcm); | |
Files.write(Paths.get("wav.wav"), wavFile); | |
} | |
} | |
private static byte[] waveHeader(long totalDataLength) { | |
return new byte[]{ | |
/* ChunckID */ | |
'R', 'I', 'F', 'F', | |
/* ChunckSize */ | |
(byte) (totalDataLength & 0xff), | |
(byte) ((totalDataLength >> 8) & 0xff), | |
(byte) ((totalDataLength >> 16) & 0xff), | |
(byte) ((totalDataLength >> 24) & 0xff), | |
/* Format */ | |
'W', 'A', 'V', 'E' | |
}; | |
} | |
private static byte[] subchunck1(int format, int channel, int sampleRate, int bitRate) { | |
return new byte[]{ | |
/* Subchunk1ID */ | |
'f', 'm', 't', ' ', | |
/* Subchunck1Size */ | |
(byte) format, 0, 0, 0, | |
/* AudioFormat */ | |
1, 0, | |
/* NumChannels */ | |
(byte) channel, 0, | |
/* SampleRate */ | |
(byte) (sampleRate & 0xff), | |
(byte) ((sampleRate >> 8) & 0xff), | |
(byte) ((sampleRate >> 16) & 0xff), | |
(byte) ((sampleRate >> 24) & 0xff), | |
/* ByteRate */ | |
(byte) ((bitRate / 8) & 0xff), | |
(byte) (((bitRate / 8) >> 8) & 0xff), | |
(byte) (((bitRate / 8) >> 16) & 0xff), | |
(byte) (((bitRate / 8) >> 24) & 0xff), | |
/* BlockAlign */ | |
(byte) ((channel * format) / 8), 0, | |
/* BitsPerSample */ | |
16, 0 | |
}; | |
} | |
private static byte[] subchunck2(byte[] pcm) { | |
byte[] subchunck2IdAndSize = new byte[]{ | |
/* Subchunck2ID */ | |
'd', 'a', 't', 'a', | |
/* Subchunck2Size */ | |
(byte) (pcm.length & 0xff), | |
(byte) ((pcm.length >> 8) & 0xff), | |
(byte) ((pcm.length >> 16) & 0xff), | |
(byte) ((pcm.length >> 24) & 0xff) | |
}; | |
byte[] subchunck2 = new byte[subchunck2IdAndSize.length + pcm.length]; | |
System.arraycopy(subchunck2IdAndSize, 0, subchunck2, 0, subchunck2IdAndSize.length); | |
System.arraycopy(pcm, 0, subchunck2, subchunck2IdAndSize.length, pcm.length); | |
return subchunck2; | |
} | |
private static byte[] muteLeftEar(byte[] pcm) { | |
byte[] pcmMutedLeft = new byte[pcm.length]; | |
for (int i = 0; i < pcm.length; i++) | |
pcmMutedLeft[i] = i % 4 < 2 ? 0 : pcm[i]; | |
return pcmMutedLeft; | |
} | |
private static byte[] muteRightEar(byte[] pcm) { | |
byte[] pcmMutedRight = new byte[pcm.length]; | |
for (int i = 0; i < pcm.length; i++) | |
pcmMutedRight[i] = i % 4 >= 2 ? pcm[i] : 0; | |
return pcmMutedRight; | |
} | |
private static byte[] muteAlternately(byte[] pcm) { | |
System.out.println(pcm.length); | |
boolean left = true; | |
byte[] pcmMuted = new byte[pcm.length]; | |
for (int i = 0; i < pcm.length; i++) { | |
// each second we record 44100 * 16 * 2 bits | |
int bytesPerSecond = 44100 * 16 * 2 / 8; | |
if (left) { | |
pcmMuted[i] = i % 4 < 2 ? 0 : pcm[i]; | |
if (i % bytesPerSecond == bytesPerSecond - 1) | |
left = false; | |
} else { | |
pcmMuted[i] = i % 4 >= 2 ? 0 : pcm[i]; | |
if (i % bytesPerSecond == bytesPerSecond - 1) | |
left = true; | |
} | |
} | |
return pcmMuted; | |
} | |
private static byte[] inverse(byte[] pcm) { | |
byte[] pcmResult = new byte[pcm.length]; | |
for (int i = 0; i < pcm.length; i++) | |
pcmResult[i] = (byte) ((~(pcm[i] & 0b01111111)) & 0xff); | |
return pcmResult; | |
} | |
private static void visualizePcm(byte[] pcm) throws IOException { | |
short[] shorts = new short[pcm.length / 2]; | |
int shortsPerSecond = 44100 * 16 * 2 / 8 / 2; | |
int start = shortsPerSecond * 55; | |
int width = shortsPerSecond; // 1 second width | |
for (int i = 0; i < shorts.length; i++) { | |
byte firstByte = pcm[i * 2]; | |
byte secondByte = pcm[i * 2 + 1]; | |
shorts[i] = (short) (((secondByte & 0xff) << 8) | (firstByte & 0xff)); | |
} | |
BufferedImage img = new BufferedImage(width, 800, BufferedImage.TYPE_INT_RGB); | |
short[] subset = new short[width]; | |
System.arraycopy(shorts, start, subset, 0, width); | |
short maxShort = subset[0]; | |
for (short value : subset) { | |
if (value > maxShort) | |
maxShort = value; | |
} | |
short minShort = subset[0]; | |
for (short value : subset) { | |
if (value < minShort) | |
minShort = value; | |
} | |
double factor = 800.0 / (maxShort - minShort); | |
for (int i = 0; i < width; i++) | |
img.setRGB(i, 400, 0x00ff00); | |
for (int i = 0; i < width; i++) { | |
img.setRGB(i, 400 + (int) (subset[i] * factor), 0x00ff00); | |
} | |
ImageIO.write(img, "png", new File("png.png")); | |
} | |
private static byte[] pcmToWav(byte[] pcm, int sampleRate, int channel, int format) { | |
long totalDataLength = pcm.length + 36; | |
short bitRate = (short) (sampleRate * channel * format); | |
byte[] waveHeader = waveHeader(totalDataLength); | |
byte[] subchunck1 = subchunck1(format, channel, sampleRate, bitRate); | |
byte[] subchunck2 = subchunck2(pcm); | |
byte[] waveFile = new byte[waveHeader.length + subchunck1.length + subchunck2.length]; | |
System.arraycopy(waveHeader, 0, waveFile, 0, waveHeader.length); | |
System.arraycopy(subchunck1, 0, waveFile, waveHeader.length, subchunck1.length); | |
System.arraycopy(subchunck2, 0, waveFile, waveHeader.length + subchunck1.length, subchunck2.length); | |
return waveFile; | |
} | |
private static void playPcm(byte[] pcm, Sound sound) throws LineUnavailableException, IOException { | |
Clip clip = AudioSystem.getClip(); | |
AudioInputStream stream = new AudioInputStream(new ByteArrayInputStream(pcm), sound.getAudioFormat(), pcm.length / 2); | |
clip.open(stream); | |
clip.start(); | |
while (clip.getMicrosecondLength() != clip.getMicrosecondPosition()) { | |
} | |
} | |
} |
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