Added music decoding

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_data/lib/src/classes/sound.dart

@@ -10,7 +10,36 @@ class AdLibSound {
   AdLibSound(this.bytes);
 }
 
-class ImfMusic {
+class ImfInstruction {
-  final Uint8List bytes;
+  final int register;
-  ImfMusic(this.bytes);
+  final int data;
+  final int delay; // Delay in 1/700ths of a second
+
+  ImfInstruction({
+    required this.register,
+    required this.data,
+    required this.delay,
+  });
+}
+
+class ImfMusic {
+  final List<ImfInstruction> instructions;
+
+  ImfMusic(this.instructions);
+
+  factory ImfMusic.fromBytes(Uint8List bytes) {
+    List<ImfInstruction> instructions = [];
+
+    // Read the file in 4-byte chunks
+    for (int i = 0; i < bytes.length - 3; i += 4) {
+      instructions.add(
+        ImfInstruction(
+          register: bytes[i],
+          data: bytes[i + 1],
+          delay: bytes[i + 2] | (bytes[i + 3] << 8), // 16-bit little-endian
+        ),
+      );
+    }
+    return ImfMusic(instructions);
+  }
 }

packages/wolf_3d_data/lib/src/wl_parser.dart

@@ -341,7 +341,7 @@ abstract class WLParser {
     List<ImfMusic> music = allAudioChunks
         .skip(300)
         .where((chunk) => chunk.isNotEmpty)
-        .map((bytes) => ImfMusic(bytes))
+        .map((bytes) => ImfMusic.fromBytes(bytes))
         .toList();
 
     return (adLib: adLib, music: music);

packages/wolf_3d_data/lib/wolf_3d_data.dart

@@ -6,7 +6,8 @@ library;
 export 'src/classes/game_file.dart' show GameFile;
 export 'src/classes/game_version.dart' show GameVersion;
 export 'src/classes/image.dart' show VgaImage;
-export 'src/classes/sound.dart' show PcmSound, AdLibSound, ImfMusic;
+export 'src/classes/sound.dart'
+    show PcmSound, AdLibSound, ImfMusic, ImfInstruction;
 export 'src/classes/sprite.dart' hide Matrix;
 export 'src/classes/wolf_level.dart' show WolfLevel;
 export 'src/classes/wolfenstein_data.dart' show WolfensteinData;