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/* @test
@summary Test SoftSincResampler interpolate method */
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.sound.sampled.*;
import com.sun.media.sound.*;
public class Interpolate {
private static float getResamplerTestValue(double i)
{
return (float)Math.sin(i / 10.0);
}
private static void perfectInterpolation(float[] in_offset, float in_end,
float[] startpitch, float pitchstep, float[] out, int[] out_offset,
int out_end) {
float pitch = startpitch[0];
float ix = in_offset[0];
int ox = out_offset[0];
float ix_end = in_end;
int ox_end = out_end;
if (pitchstep == 0f) {
while (ix < ix_end && ox < ox_end) {
out[ox++] = getResamplerTestValue(ix);
ix += pitch;
}
} else {
while (ix < ix_end && ox < ox_end) {
out[ox++] = getResamplerTestValue(ix);
ix += pitch;
pitch += pitchstep;
}
}
in_offset[0] = ix;
out_offset[0] = ox;
startpitch[0] = pitch;
}
private static float testResampler(SoftAbstractResampler resampler, float p_pitch, float p_pitch2)
{
float[] testbuffer = new float[4096];
float[] testbuffer2 = new float[1024];
float[] testbuffer3 = new float[1024];
for (int i = 0; i < testbuffer.length; i++)
testbuffer[i] = getResamplerTestValue(i);
int pads = resampler.getPadding();
float pitchstep = (p_pitch2 - p_pitch)/1024f;
int[] out_offset2 = {0};
int[] out_offset3 = {0};
resampler.interpolate(testbuffer, new float[] {pads}, testbuffer.length - pads, new float[] {p_pitch}, pitchstep, testbuffer2, out_offset2, testbuffer2.length);
perfectInterpolation(new float[] {pads}, testbuffer.length - pads, new float[] {p_pitch}, pitchstep, testbuffer3, out_offset3, testbuffer3.length);
int out_off = out_offset2[0];
if(out_offset3[0] < out_off)
out_off = out_offset3[0];
float ac_error = 0;
int counter = 0;
for (int i = pads; i < out_off; i++) {
ac_error += Math.abs(testbuffer2[i] - testbuffer3[i]);
counter++;
}
return ac_error / ((float)counter);
}
private static void fail(String error) throws Exception
{
throw new RuntimeException(error);
}
public static void main(String[] args) throws Exception {
SoftSincResampler resampler = new SoftSincResampler();
float max = testResampler(resampler, 0.3f, 0.3f);
if(max > 0.0001)
fail("Interpolation failed, error="+max);
max = testResampler(resampler, 0.3f, 0.01f);
if(max > 0.0001)
fail("Interpolation failed, error="+max);
max = testResampler(resampler, 1.0f, 0.00f);
if(max > 0.0001)
fail("Interpolation failed, error="+max);
}
}