src/game/java/com/mojang/blaze3d/audio/Channel.java

package com.mojang.blaze3d.audio;

import com.mojang.logging.LogUtils;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.annotation.Nullable;
import javax.sound.sampled.AudioFormat;
import net.minecraft.client.sounds.AudioStream;
import net.minecraft.world.phys.Vec3;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;
import org.lwjgl.openal.AL10;
import org.slf4j.Logger;

@OnlyIn(Dist.CLIENT)
public class Channel {
    private static final Logger LOGGER = LogUtils.getLogger();
    private static final int QUEUED_BUFFER_COUNT = 4;
    public static final int BUFFER_DURATION_SECONDS = 1;
    private final int source;
    private final AtomicBoolean initialized = new AtomicBoolean(true);
    private int streamingBufferSize = 16384;
    @Nullable
    private AudioStream stream;

    @Nullable
    static Channel create() {
        int[] aint = new int[1];
        AL10.alGenSources(aint);
        return OpenAlUtil.checkALError("Allocate new source") ? null : new Channel(aint[0]);
    }

    private Channel(int p_83648_) {
        this.source = p_83648_;
    }

    public void destroy() {
        if (this.initialized.compareAndSet(true, false)) {
            AL10.alSourceStop(this.source);
            OpenAlUtil.checkALError("Stop");
            if (this.stream != null) {
                try {
                    this.stream.close();
                } catch (IOException ioexception) {
                    LOGGER.error("Failed to close audio stream", (Throwable)ioexception);
                }

                this.removeProcessedBuffers();
                this.stream = null;
            }

            AL10.alDeleteSources(new int[]{this.source});
            OpenAlUtil.checkALError("Cleanup");
        }
    }

    public void play() {
        AL10.alSourcePlay(this.source);
    }

    private int getState() {
        return !this.initialized.get() ? 4116 : AL10.alGetSourcei(this.source, 4112);
    }

    public void pause() {
        if (this.getState() == 4114) {
            AL10.alSourcePause(this.source);
        }
    }

    public void unpause() {
        if (this.getState() == 4115) {
            AL10.alSourcePlay(this.source);
        }
    }

    public void stop() {
        if (this.initialized.get()) {
            AL10.alSourceStop(this.source);
            OpenAlUtil.checkALError("Stop");
        }
    }

    public boolean playing() {
        return this.getState() == 4114;
    }

    public boolean stopped() {
        return this.getState() == 4116;
    }

    public void setSelfPosition(Vec3 p_83655_) {
        AL10.alSourcefv(this.source, 4100, new float[]{(float)p_83655_.x, (float)p_83655_.y, (float)p_83655_.z});
    }

    public void setPitch(float p_83651_) {
        AL10.alSourcef(this.source, 4099, p_83651_);
    }

    public void setLooping(boolean p_83664_) {
        AL10.alSourcei(this.source, 4103, p_83664_ ? 1 : 0);
    }

    public void setVolume(float p_83667_) {
        AL10.alSourcef(this.source, 4106, p_83667_);
    }

    public void disableAttenuation() {
        AL10.alSourcei(this.source, 53248, 0);
    }

    public void linearAttenuation(float p_83674_) {
        AL10.alSourcei(this.source, 53248, 53251);
        AL10.alSourcef(this.source, 4131, p_83674_);
        AL10.alSourcef(this.source, 4129, 1.0F);
        AL10.alSourcef(this.source, 4128, 0.0F);
    }

    public void setRelative(boolean p_83671_) {
        AL10.alSourcei(this.source, 514, p_83671_ ? 1 : 0);
    }

    public void attachStaticBuffer(SoundBuffer p_83657_) {
        p_83657_.getAlBuffer().ifPresent(p_83676_ -> AL10.alSourcei(this.source, 4105, p_83676_));
    }

    public void attachBufferStream(AudioStream p_83659_) {
        this.stream = p_83659_;
        AudioFormat audioformat = p_83659_.getFormat();
        this.streamingBufferSize = calculateBufferSize(audioformat, 1);
        this.pumpBuffers(4);
    }

    private static int calculateBufferSize(AudioFormat p_83661_, int p_83662_) {
        return (int)((float)(p_83662_ * p_83661_.getSampleSizeInBits()) / 8.0F * (float)p_83661_.getChannels() * p_83661_.getSampleRate());
    }

    private void pumpBuffers(int p_83653_) {
        if (this.stream != null) {
            try {
                for (int i = 0; i < p_83653_; i++) {
                    ByteBuffer bytebuffer = this.stream.read(this.streamingBufferSize);
                    if (bytebuffer != null) {
                        new SoundBuffer(bytebuffer, this.stream.getFormat())
                            .releaseAlBuffer()
                            .ifPresent(p_83669_ -> AL10.alSourceQueueBuffers(this.source, new int[]{p_83669_}));
                    }
                }
            } catch (IOException ioexception) {
                LOGGER.error("Failed to read from audio stream", (Throwable)ioexception);
            }
        }
    }

    public void updateStream() {
        if (this.stream != null) {
            int i = this.removeProcessedBuffers();
            this.pumpBuffers(i);
        }
    }

    private int removeProcessedBuffers() {
        int i = AL10.alGetSourcei(this.source, 4118);
        if (i > 0) {
            int[] aint = new int[i];
            AL10.alSourceUnqueueBuffers(this.source, aint);
            OpenAlUtil.checkALError("Unqueue buffers");
            AL10.alDeleteBuffers(aint);
            OpenAlUtil.checkALError("Remove processed buffers");
        }

        return i;
    }
}