Created
April 19, 2009 09:32
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import java.lang.Math; | |
import java.util.Vector; | |
import java.io.ByteArrayInputStream; | |
import java.io.File; | |
import java.io.IOException; | |
import javax.sound.sampled.*; | |
public class SinWave { | |
private static final float SAMPLE_RATE = 44100.0f; | |
private static final int SAMPLE_SIZE = 16; | |
private static final int CHANNEL = 2; | |
private static final int FRAME_SIZE = 2; | |
private static final float FRAME_RATE = 44100.0f; | |
private static final int VOLUME = 50; | |
public static void main (final String[] arg) | |
throws IOException { | |
Vector<Float> freqs = new Vector<Float>(); | |
for (int i = 0; i < arg.length; i++) { | |
freqs.add(Float.valueOf(arg[i])); | |
} | |
int buffsize = ((int)SAMPLE_RATE * CHANNEL); | |
byte[] buff = new byte[(buffsize * freqs.size())]; | |
int cursor = 0; | |
for (Float freq : freqs) { | |
// SAMPLE_RATE 内で target_hz 個の波形を入れる必要が | |
// あるため、一回の波形に割り当てるサンプル数は | |
// (SAMPLE_RATE / target_hz) になる。 | |
float target_freq = freq.floatValue(); | |
int samples_per_round = (int)(SAMPLE_RATE / target_freq); | |
// target_freq 回波形を書く | |
for (int i = 0; i < (int)target_freq; i++) { | |
// 1回の波形を samples_per_round の点に分けて書く | |
for (int x = 0; x < samples_per_round; x++) { | |
float progress = ((float)x / samples_per_round); | |
double radian = progress * (2 * Math.PI); | |
byte y = (byte)(Math.sin(radian) * VOLUME); | |
buff[cursor++] = y; // Left | |
buff[cursor++] = y; // Right | |
} | |
} | |
} | |
// WAVE ファイルとして出力 | |
AudioFormat fmt = new AudioFormat( | |
// AudioFormat.Encoding encoding | |
AudioFormat.Encoding.PCM_SIGNED, | |
SAMPLE_RATE, // sampleRate | |
SAMPLE_SIZE, // sampleSizeInBits | |
CHANNEL, // channels | |
FRAME_SIZE, // frameSize | |
FRAME_RATE, // frameRate | |
true //int bigEndian | |
); | |
AudioInputStream audio_stream = new AudioInputStream( | |
new ByteArrayInputStream(buff), fmt, cursor); | |
File outfile = new File("sinwave.wav"); | |
AudioSystem.write(audio_stream | |
, AudioFileFormat.Type.WAVE, outfile); | |
} | |
} | |
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