Send entire DFPWM encoder state to the client

This ensures the client decoder is in sync with the server. Well, mostly
- we don't handle the anti-jerk, but that should correct itself within a
few samples.

Fixes #1748

projects/common/src/test/java/dan200/computercraft/client/sound/DfpwmStreamTest.java

@@ -4,6 +4,7 @@
 
 package dan200.computercraft.client.sound;
 
+import dan200.computercraft.shared.peripheral.speaker.EncodedAudio;
 import org.junit.jupiter.api.Test;
 
 import java.nio.ByteBuffer;
@@ -16,7 +17,7 @@ public class DfpwmStreamTest {
         var stream = new DfpwmStream();
 
         var input = ByteBuffer.wrap(new byte[]{ 43, -31, 33, 44, 30, -16, -85, 23, -3, -55, 46, -70, 68, -67, 74, -96, -68, 16, 94, -87, -5, 87, 11, -16, 19, 92, 85, -71, 126, 5, -84, 64, 17, -6, 85, -11, -1, -87, -12, 1, 85, -56, 33, -80, 82, 104, -93, 17, 126, 23, 91, -30, 37, -32, 117, -72, -58, 11, -76, 19, -108, 86, -65, -10, -1, -68, -25, 10, -46, 85, 124, -54, 15, -24, 43, -94, 117, 63, -36, 15, -6, 88, 87, -26, -83, 106, 41, 13, -28, -113, -10, -66, 119, -87, -113, 68, -55, 40, -107, 62, 20, 72, 3, -96, 114, -87, -2, 39, -104, 30, 20, 42, 84, 24, 47, 64, 43, 61, -35, 95, -65, 42, 61, 42, -50, 4, -9, 81 });
-        stream.push(input);
+        stream.push(new EncodedAudio(0, 0, false, input));
 
         var buffer = stream.read(1024 + 1);
         assertEquals(1024, buffer.remaining(), "Must have read 1024 bytes");

projects/common/src/test/java/dan200/computercraft/shared/peripheral/speaker/DfpwmStateTest.java

@@ -23,7 +23,7 @@ class DfpwmStateTest {
 
         var state = new DfpwmState();
         state.pushBuffer(new ObjectLuaTable(inputTbl), input.length, Optional.empty());
-        var result = state.pullPending(0);
+        var result = state.pullPending(0).audio();
         var contents = new byte[result.remaining()];
         result.get(contents);
 

projects/common/src/test/java/dan200/computercraft/shared/peripheral/speaker/EncodedAudioTest.java

@@ -0,0 +1,42 @@
+// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.shared.peripheral.speaker;
+
+import dan200.computercraft.test.core.ArbitraryByteBuffer;
+import io.netty.buffer.Unpooled;
+import net.jqwik.api.*;
+import net.minecraft.network.FriendlyByteBuf;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class EncodedAudioTest {
+    /**
+     * Sends the audio on a roundtrip, ensuring that its contents are reassembled on the other end.
+     *
+     * @param audio The message to send.
+     */
+    @Property
+    public void testRoundTrip(@ForAll("audio") EncodedAudio audio) {
+        var buffer = new FriendlyByteBuf(Unpooled.directBuffer());
+        audio.write(buffer);
+
+        var converted = EncodedAudio.read(buffer);
+        assertEquals(buffer.readableBytes(), 0, "Whole packet was read");
+
+        assertThat("Messages are equal", converted, equalTo(converted));
+    }
+
+    @Provide
+    Arbitrary<EncodedAudio> audio() {
+        return Combinators.combine(
+            Arbitraries.integers(),
+            Arbitraries.integers(),
+            Arbitraries.of(true, false),
+            ArbitraryByteBuffer.bytes().ofMaxSize(1000)
+        ).as(EncodedAudio::new);
+    }
+}